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 static void handle_step_into_function (struct execution_control_state *ecs);
967 void handle_inferior_event (struct execution_control_state *ecs);
969 static void step_into_function (struct execution_control_state *ecs);
970 static void insert_step_resume_breakpoint (struct frame_info *step_frame,
971 struct execution_control_state *ecs);
972 static void stop_stepping (struct execution_control_state *ecs);
973 static void prepare_to_wait (struct execution_control_state *ecs);
974 static void keep_going (struct execution_control_state *ecs);
975 static void print_stop_reason (enum inferior_stop_reason stop_reason,
978 /* Wait for control to return from inferior to debugger.
979 If inferior gets a signal, we may decide to start it up again
980 instead of returning. That is why there is a loop in this function.
981 When this function actually returns it means the inferior
982 should be left stopped and GDB should read more commands. */
985 wait_for_inferior (void)
987 struct cleanup *old_cleanups;
988 struct execution_control_state ecss;
989 struct execution_control_state *ecs;
991 old_cleanups = make_cleanup (delete_step_resume_breakpoint,
992 &step_resume_breakpoint);
994 /* wfi still stays in a loop, so it's OK just to take the address of
995 a local to get the ecs pointer. */
998 /* Fill in with reasonable starting values. */
999 init_execution_control_state (ecs);
1001 /* We'll update this if & when we switch to a new thread. */
1002 previous_inferior_ptid = inferior_ptid;
1004 overlay_cache_invalid = 1;
1006 /* We have to invalidate the registers BEFORE calling target_wait
1007 because they can be loaded from the target while in target_wait.
1008 This makes remote debugging a bit more efficient for those
1009 targets that provide critical registers as part of their normal
1010 status mechanism. */
1012 registers_changed ();
1016 if (deprecated_target_wait_hook)
1017 ecs->ptid = deprecated_target_wait_hook (ecs->waiton_ptid, ecs->wp);
1019 ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp);
1021 /* Now figure out what to do with the result of the result. */
1022 handle_inferior_event (ecs);
1024 if (!ecs->wait_some_more)
1027 do_cleanups (old_cleanups);
1030 /* Asynchronous version of wait_for_inferior. It is called by the
1031 event loop whenever a change of state is detected on the file
1032 descriptor corresponding to the target. It can be called more than
1033 once to complete a single execution command. In such cases we need
1034 to keep the state in a global variable ASYNC_ECSS. If it is the
1035 last time that this function is called for a single execution
1036 command, then report to the user that the inferior has stopped, and
1037 do the necessary cleanups. */
1039 struct execution_control_state async_ecss;
1040 struct execution_control_state *async_ecs;
1043 fetch_inferior_event (void *client_data)
1045 static struct cleanup *old_cleanups;
1047 async_ecs = &async_ecss;
1049 if (!async_ecs->wait_some_more)
1051 old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint,
1052 &step_resume_breakpoint);
1054 /* Fill in with reasonable starting values. */
1055 init_execution_control_state (async_ecs);
1057 /* We'll update this if & when we switch to a new thread. */
1058 previous_inferior_ptid = inferior_ptid;
1060 overlay_cache_invalid = 1;
1062 /* We have to invalidate the registers BEFORE calling target_wait
1063 because they can be loaded from the target while in target_wait.
1064 This makes remote debugging a bit more efficient for those
1065 targets that provide critical registers as part of their normal
1066 status mechanism. */
1068 registers_changed ();
1071 if (deprecated_target_wait_hook)
1073 deprecated_target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp);
1075 async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp);
1077 /* Now figure out what to do with the result of the result. */
1078 handle_inferior_event (async_ecs);
1080 if (!async_ecs->wait_some_more)
1082 /* Do only the cleanups that have been added by this
1083 function. Let the continuations for the commands do the rest,
1084 if there are any. */
1085 do_exec_cleanups (old_cleanups);
1087 if (step_multi && stop_step)
1088 inferior_event_handler (INF_EXEC_CONTINUE, NULL);
1090 inferior_event_handler (INF_EXEC_COMPLETE, NULL);
1094 /* Prepare an execution control state for looping through a
1095 wait_for_inferior-type loop. */
1098 init_execution_control_state (struct execution_control_state *ecs)
1100 /* ecs->another_trap? */
1101 ecs->random_signal = 0;
1102 ecs->remove_breakpoints_on_following_step = 0;
1103 ecs->handling_longjmp = 0; /* FIXME */
1104 ecs->stepping_through_solib_after_catch = 0;
1105 ecs->stepping_through_solib_catchpoints = NULL;
1106 ecs->enable_hw_watchpoints_after_wait = 0;
1107 ecs->stepping_through_sigtramp = 0;
1108 ecs->sal = find_pc_line (prev_pc, 0);
1109 ecs->current_line = ecs->sal.line;
1110 ecs->current_symtab = ecs->sal.symtab;
1111 ecs->infwait_state = infwait_normal_state;
1112 ecs->waiton_ptid = pid_to_ptid (-1);
1113 ecs->wp = &(ecs->ws);
1116 /* Call this function before setting step_resume_breakpoint, as a
1117 sanity check. There should never be more than one step-resume
1118 breakpoint per thread, so we should never be setting a new
1119 step_resume_breakpoint when one is already active. */
1121 check_for_old_step_resume_breakpoint (void)
1123 if (step_resume_breakpoint)
1125 ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint");
1128 /* Return the cached copy of the last pid/waitstatus returned by
1129 target_wait()/deprecated_target_wait_hook(). The data is actually
1130 cached by handle_inferior_event(), which gets called immediately
1131 after target_wait()/deprecated_target_wait_hook(). */
1134 get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status)
1136 *ptidp = target_last_wait_ptid;
1137 *status = target_last_waitstatus;
1140 /* Switch thread contexts, maintaining "infrun state". */
1143 context_switch (struct execution_control_state *ecs)
1145 /* Caution: it may happen that the new thread (or the old one!)
1146 is not in the thread list. In this case we must not attempt
1147 to "switch context", or we run the risk that our context may
1148 be lost. This may happen as a result of the target module
1149 mishandling thread creation. */
1151 if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid))
1152 { /* Perform infrun state context switch: */
1153 /* Save infrun state for the old thread. */
1154 save_infrun_state (inferior_ptid, prev_pc,
1155 trap_expected, step_resume_breakpoint,
1157 step_range_end, &step_frame_id,
1158 ecs->handling_longjmp, ecs->another_trap,
1159 ecs->stepping_through_solib_after_catch,
1160 ecs->stepping_through_solib_catchpoints,
1161 ecs->stepping_through_sigtramp,
1162 ecs->current_line, ecs->current_symtab);
1164 /* Load infrun state for the new thread. */
1165 load_infrun_state (ecs->ptid, &prev_pc,
1166 &trap_expected, &step_resume_breakpoint,
1168 &step_range_end, &step_frame_id,
1169 &ecs->handling_longjmp, &ecs->another_trap,
1170 &ecs->stepping_through_solib_after_catch,
1171 &ecs->stepping_through_solib_catchpoints,
1172 &ecs->stepping_through_sigtramp,
1173 &ecs->current_line, &ecs->current_symtab);
1175 inferior_ptid = ecs->ptid;
1178 /* Handle the inferior event in the cases when we just stepped
1182 handle_step_into_function (struct execution_control_state *ecs)
1184 CORE_ADDR real_stop_pc;
1186 if ((step_over_calls == STEP_OVER_NONE)
1187 || ((step_range_end == 1)
1188 && in_prologue (prev_pc, ecs->stop_func_start)))
1190 /* I presume that step_over_calls is only 0 when we're
1191 supposed to be stepping at the assembly language level
1192 ("stepi"). Just stop. */
1193 /* Also, maybe we just did a "nexti" inside a prolog,
1194 so we thought it was a subroutine call but it was not.
1195 Stop as well. FENN */
1197 print_stop_reason (END_STEPPING_RANGE, 0);
1198 stop_stepping (ecs);
1202 if (step_over_calls == STEP_OVER_ALL || IGNORE_HELPER_CALL (stop_pc))
1204 /* We're doing a "next", set a breakpoint at callee's return
1205 address (the address at which the caller will resume). */
1206 insert_step_resume_breakpoint (get_prev_frame (get_current_frame ()),
1212 /* If we are in a function call trampoline (a stub between
1213 the calling routine and the real function), locate the real
1214 function. That's what tells us (a) whether we want to step
1215 into it at all, and (b) what prologue we want to run to
1216 the end of, if we do step into it. */
1217 real_stop_pc = skip_language_trampoline (stop_pc);
1218 if (real_stop_pc == 0)
1219 real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc);
1220 if (real_stop_pc != 0)
1221 ecs->stop_func_start = real_stop_pc;
1223 /* If we have line number information for the function we
1224 are thinking of stepping into, step into it.
1226 If there are several symtabs at that PC (e.g. with include
1227 files), just want to know whether *any* of them have line
1228 numbers. find_pc_line handles this. */
1230 struct symtab_and_line tmp_sal;
1232 tmp_sal = find_pc_line (ecs->stop_func_start, 0);
1233 if (tmp_sal.line != 0)
1235 step_into_function (ecs);
1240 /* If we have no line number and the step-stop-if-no-debug
1241 is set, we stop the step so that the user has a chance to
1242 switch in assembly mode. */
1243 if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug)
1246 print_stop_reason (END_STEPPING_RANGE, 0);
1247 stop_stepping (ecs);
1251 /* Set a breakpoint at callee's return address (the address at which
1252 the caller will resume). */
1253 insert_step_resume_breakpoint (get_prev_frame (get_current_frame ()), ecs);
1259 adjust_pc_after_break (struct execution_control_state *ecs)
1261 CORE_ADDR breakpoint_pc;
1263 /* If this target does not decrement the PC after breakpoints, then
1264 we have nothing to do. */
1265 if (DECR_PC_AFTER_BREAK == 0)
1268 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
1269 we aren't, just return.
1271 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
1272 affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented
1273 by software breakpoints should be handled through the normal breakpoint
1276 NOTE drow/2004-01-31: On some targets, breakpoints may generate
1277 different signals (SIGILL or SIGEMT for instance), but it is less
1278 clear where the PC is pointing afterwards. It may not match
1279 DECR_PC_AFTER_BREAK. I don't know any specific target that generates
1280 these signals at breakpoints (the code has been in GDB since at least
1281 1992) so I can not guess how to handle them here.
1283 In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS
1284 would have the PC after hitting a watchpoint affected by
1285 DECR_PC_AFTER_BREAK. I haven't found any target with both of these set
1286 in GDB history, and it seems unlikely to be correct, so
1287 HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */
1289 if (ecs->ws.kind != TARGET_WAITKIND_STOPPED)
1292 if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP)
1295 /* Find the location where (if we've hit a breakpoint) the
1296 breakpoint would be. */
1297 breakpoint_pc = read_pc_pid (ecs->ptid) - DECR_PC_AFTER_BREAK;
1299 if (SOFTWARE_SINGLE_STEP_P ())
1301 /* When using software single-step, a SIGTRAP can only indicate
1302 an inserted breakpoint. This actually makes things
1304 if (singlestep_breakpoints_inserted_p)
1305 /* When software single stepping, the instruction at [prev_pc]
1306 is never a breakpoint, but the instruction following
1307 [prev_pc] (in program execution order) always is. Assume
1308 that following instruction was reached and hence a software
1309 breakpoint was hit. */
1310 write_pc_pid (breakpoint_pc, ecs->ptid);
1311 else if (software_breakpoint_inserted_here_p (breakpoint_pc))
1312 /* The inferior was free running (i.e., no single-step
1313 breakpoints inserted) and it hit a software breakpoint. */
1314 write_pc_pid (breakpoint_pc, ecs->ptid);
1318 /* When using hardware single-step, a SIGTRAP is reported for
1319 both a completed single-step and a software breakpoint. Need
1320 to differentiate between the two as the latter needs
1321 adjusting but the former does not. */
1322 if (currently_stepping (ecs))
1324 if (prev_pc == breakpoint_pc
1325 && software_breakpoint_inserted_here_p (breakpoint_pc))
1326 /* Hardware single-stepped a software breakpoint (as
1327 occures when the inferior is resumed with PC pointing
1328 at not-yet-hit software breakpoint). Since the
1329 breakpoint really is executed, the inferior needs to be
1330 backed up to the breakpoint address. */
1331 write_pc_pid (breakpoint_pc, ecs->ptid);
1335 if (software_breakpoint_inserted_here_p (breakpoint_pc))
1336 /* The inferior was free running (i.e., no hardware
1337 single-step and no possibility of a false SIGTRAP) and
1338 hit a software breakpoint. */
1339 write_pc_pid (breakpoint_pc, ecs->ptid);
1344 /* Given an execution control state that has been freshly filled in
1345 by an event from the inferior, figure out what it means and take
1346 appropriate action. */
1348 int stepped_after_stopped_by_watchpoint;
1351 handle_inferior_event (struct execution_control_state *ecs)
1353 /* NOTE: cagney/2003-03-28: If you're looking at this code and
1354 thinking that the variable stepped_after_stopped_by_watchpoint
1355 isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT,
1356 defined in the file "config/pa/nm-hppah.h", accesses the variable
1357 indirectly. Mutter something rude about the HP merge. */
1358 int sw_single_step_trap_p = 0;
1360 /* Cache the last pid/waitstatus. */
1361 target_last_wait_ptid = ecs->ptid;
1362 target_last_waitstatus = *ecs->wp;
1364 adjust_pc_after_break (ecs);
1366 switch (ecs->infwait_state)
1368 case infwait_thread_hop_state:
1369 /* Cancel the waiton_ptid. */
1370 ecs->waiton_ptid = pid_to_ptid (-1);
1371 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1372 is serviced in this loop, below. */
1373 if (ecs->enable_hw_watchpoints_after_wait)
1375 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid));
1376 ecs->enable_hw_watchpoints_after_wait = 0;
1378 stepped_after_stopped_by_watchpoint = 0;
1381 case infwait_normal_state:
1382 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1383 is serviced in this loop, below. */
1384 if (ecs->enable_hw_watchpoints_after_wait)
1386 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid));
1387 ecs->enable_hw_watchpoints_after_wait = 0;
1389 stepped_after_stopped_by_watchpoint = 0;
1392 case infwait_nullified_state:
1393 stepped_after_stopped_by_watchpoint = 0;
1396 case infwait_nonstep_watch_state:
1397 insert_breakpoints ();
1399 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1400 handle things like signals arriving and other things happening
1401 in combination correctly? */
1402 stepped_after_stopped_by_watchpoint = 1;
1406 internal_error (__FILE__, __LINE__, "bad switch");
1408 ecs->infwait_state = infwait_normal_state;
1410 flush_cached_frames ();
1412 /* If it's a new process, add it to the thread database */
1414 ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid)
1415 && !in_thread_list (ecs->ptid));
1417 if (ecs->ws.kind != TARGET_WAITKIND_EXITED
1418 && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event)
1420 add_thread (ecs->ptid);
1422 ui_out_text (uiout, "[New ");
1423 ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid));
1424 ui_out_text (uiout, "]\n");
1427 /* NOTE: This block is ONLY meant to be invoked in case of a
1428 "thread creation event"! If it is invoked for any other
1429 sort of event (such as a new thread landing on a breakpoint),
1430 the event will be discarded, which is almost certainly
1433 To avoid this, the low-level module (eg. target_wait)
1434 should call in_thread_list and add_thread, so that the
1435 new thread is known by the time we get here. */
1437 /* We may want to consider not doing a resume here in order
1438 to give the user a chance to play with the new thread.
1439 It might be good to make that a user-settable option. */
1441 /* At this point, all threads are stopped (happens
1442 automatically in either the OS or the native code).
1443 Therefore we need to continue all threads in order to
1446 target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0);
1447 prepare_to_wait (ecs);
1452 switch (ecs->ws.kind)
1454 case TARGET_WAITKIND_LOADED:
1455 /* Ignore gracefully during startup of the inferior, as it
1456 might be the shell which has just loaded some objects,
1457 otherwise add the symbols for the newly loaded objects. */
1459 if (stop_soon == NO_STOP_QUIETLY)
1461 /* Remove breakpoints, SOLIB_ADD might adjust
1462 breakpoint addresses via breakpoint_re_set. */
1463 if (breakpoints_inserted)
1464 remove_breakpoints ();
1466 /* Check for any newly added shared libraries if we're
1467 supposed to be adding them automatically. Switch
1468 terminal for any messages produced by
1469 breakpoint_re_set. */
1470 target_terminal_ours_for_output ();
1471 /* NOTE: cagney/2003-11-25: Make certain that the target
1472 stack's section table is kept up-to-date. Architectures,
1473 (e.g., PPC64), use the section table to perform
1474 operations such as address => section name and hence
1475 require the table to contain all sections (including
1476 those found in shared libraries). */
1477 /* NOTE: cagney/2003-11-25: Pass current_target and not
1478 exec_ops to SOLIB_ADD. This is because current GDB is
1479 only tooled to propagate section_table changes out from
1480 the "current_target" (see target_resize_to_sections), and
1481 not up from the exec stratum. This, of course, isn't
1482 right. "infrun.c" should only interact with the
1483 exec/process stratum, instead relying on the target stack
1484 to propagate relevant changes (stop, section table
1485 changed, ...) up to other layers. */
1486 SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add);
1487 target_terminal_inferior ();
1489 /* Reinsert breakpoints and continue. */
1490 if (breakpoints_inserted)
1491 insert_breakpoints ();
1494 resume (0, TARGET_SIGNAL_0);
1495 prepare_to_wait (ecs);
1498 case TARGET_WAITKIND_SPURIOUS:
1499 resume (0, TARGET_SIGNAL_0);
1500 prepare_to_wait (ecs);
1503 case TARGET_WAITKIND_EXITED:
1504 target_terminal_ours (); /* Must do this before mourn anyway */
1505 print_stop_reason (EXITED, ecs->ws.value.integer);
1507 /* Record the exit code in the convenience variable $_exitcode, so
1508 that the user can inspect this again later. */
1509 set_internalvar (lookup_internalvar ("_exitcode"),
1510 value_from_longest (builtin_type_int,
1511 (LONGEST) ecs->ws.value.integer));
1512 gdb_flush (gdb_stdout);
1513 target_mourn_inferior ();
1514 singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */
1515 stop_print_frame = 0;
1516 stop_stepping (ecs);
1519 case TARGET_WAITKIND_SIGNALLED:
1520 stop_print_frame = 0;
1521 stop_signal = ecs->ws.value.sig;
1522 target_terminal_ours (); /* Must do this before mourn anyway */
1524 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1525 reach here unless the inferior is dead. However, for years
1526 target_kill() was called here, which hints that fatal signals aren't
1527 really fatal on some systems. If that's true, then some changes
1529 target_mourn_inferior ();
1531 print_stop_reason (SIGNAL_EXITED, stop_signal);
1532 singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */
1533 stop_stepping (ecs);
1536 /* The following are the only cases in which we keep going;
1537 the above cases end in a continue or goto. */
1538 case TARGET_WAITKIND_FORKED:
1539 case TARGET_WAITKIND_VFORKED:
1540 stop_signal = TARGET_SIGNAL_TRAP;
1541 pending_follow.kind = ecs->ws.kind;
1543 pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid);
1544 pending_follow.fork_event.child_pid = ecs->ws.value.related_pid;
1546 stop_pc = read_pc ();
1548 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid);
1550 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1552 /* If no catchpoint triggered for this, then keep going. */
1553 if (ecs->random_signal)
1555 stop_signal = TARGET_SIGNAL_0;
1559 goto process_event_stop_test;
1561 case TARGET_WAITKIND_EXECD:
1562 stop_signal = TARGET_SIGNAL_TRAP;
1564 /* NOTE drow/2002-12-05: This code should be pushed down into the
1565 target_wait function. Until then following vfork on HP/UX 10.20
1566 is probably broken by this. Of course, it's broken anyway. */
1567 /* Is this a target which reports multiple exec events per actual
1568 call to exec()? (HP-UX using ptrace does, for example.) If so,
1569 ignore all but the last one. Just resume the exec'r, and wait
1570 for the next exec event. */
1571 if (inferior_ignoring_leading_exec_events)
1573 inferior_ignoring_leading_exec_events--;
1574 if (pending_follow.kind == TARGET_WAITKIND_VFORKED)
1575 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event.
1577 target_resume (ecs->ptid, 0, TARGET_SIGNAL_0);
1578 prepare_to_wait (ecs);
1581 inferior_ignoring_leading_exec_events =
1582 target_reported_exec_events_per_exec_call () - 1;
1584 pending_follow.execd_pathname =
1585 savestring (ecs->ws.value.execd_pathname,
1586 strlen (ecs->ws.value.execd_pathname));
1588 /* This causes the eventpoints and symbol table to be reset. Must
1589 do this now, before trying to determine whether to stop. */
1590 follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname);
1591 xfree (pending_follow.execd_pathname);
1593 stop_pc = read_pc_pid (ecs->ptid);
1594 ecs->saved_inferior_ptid = inferior_ptid;
1595 inferior_ptid = ecs->ptid;
1597 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid);
1599 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1600 inferior_ptid = ecs->saved_inferior_ptid;
1602 /* If no catchpoint triggered for this, then keep going. */
1603 if (ecs->random_signal)
1605 stop_signal = TARGET_SIGNAL_0;
1609 goto process_event_stop_test;
1611 /* These syscall events are returned on HP-UX, as part of its
1612 implementation of page-protection-based "hardware" watchpoints.
1613 HP-UX has unfortunate interactions between page-protections and
1614 some system calls. Our solution is to disable hardware watches
1615 when a system call is entered, and reenable them when the syscall
1616 completes. The downside of this is that we may miss the precise
1617 point at which a watched piece of memory is modified. "Oh well."
1619 Note that we may have multiple threads running, which may each
1620 enter syscalls at roughly the same time. Since we don't have a
1621 good notion currently of whether a watched piece of memory is
1622 thread-private, we'd best not have any page-protections active
1623 when any thread is in a syscall. Thus, we only want to reenable
1624 hardware watches when no threads are in a syscall.
1626 Also, be careful not to try to gather much state about a thread
1627 that's in a syscall. It's frequently a losing proposition. */
1628 case TARGET_WAITKIND_SYSCALL_ENTRY:
1629 number_of_threads_in_syscalls++;
1630 if (number_of_threads_in_syscalls == 1)
1632 TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid));
1634 resume (0, TARGET_SIGNAL_0);
1635 prepare_to_wait (ecs);
1638 /* Before examining the threads further, step this thread to
1639 get it entirely out of the syscall. (We get notice of the
1640 event when the thread is just on the verge of exiting a
1641 syscall. Stepping one instruction seems to get it back
1644 Note that although the logical place to reenable h/w watches
1645 is here, we cannot. We cannot reenable them before stepping
1646 the thread (this causes the next wait on the thread to hang).
1648 Nor can we enable them after stepping until we've done a wait.
1649 Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait
1650 here, which will be serviced immediately after the target
1652 case TARGET_WAITKIND_SYSCALL_RETURN:
1653 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0);
1655 if (number_of_threads_in_syscalls > 0)
1657 number_of_threads_in_syscalls--;
1658 ecs->enable_hw_watchpoints_after_wait =
1659 (number_of_threads_in_syscalls == 0);
1661 prepare_to_wait (ecs);
1664 case TARGET_WAITKIND_STOPPED:
1665 stop_signal = ecs->ws.value.sig;
1668 /* We had an event in the inferior, but we are not interested
1669 in handling it at this level. The lower layers have already
1670 done what needs to be done, if anything.
1672 One of the possible circumstances for this is when the
1673 inferior produces output for the console. The inferior has
1674 not stopped, and we are ignoring the event. Another possible
1675 circumstance is any event which the lower level knows will be
1676 reported multiple times without an intervening resume. */
1677 case TARGET_WAITKIND_IGNORE:
1678 prepare_to_wait (ecs);
1682 /* We may want to consider not doing a resume here in order to give
1683 the user a chance to play with the new thread. It might be good
1684 to make that a user-settable option. */
1686 /* At this point, all threads are stopped (happens automatically in
1687 either the OS or the native code). Therefore we need to continue
1688 all threads in order to make progress. */
1689 if (ecs->new_thread_event)
1691 target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0);
1692 prepare_to_wait (ecs);
1696 stop_pc = read_pc_pid (ecs->ptid);
1698 if (stepping_past_singlestep_breakpoint)
1700 gdb_assert (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p);
1701 gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid));
1702 gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid));
1704 stepping_past_singlestep_breakpoint = 0;
1706 /* We've either finished single-stepping past the single-step
1707 breakpoint, or stopped for some other reason. It would be nice if
1708 we could tell, but we can't reliably. */
1709 if (stop_signal == TARGET_SIGNAL_TRAP)
1711 /* Pull the single step breakpoints out of the target. */
1712 SOFTWARE_SINGLE_STEP (0, 0);
1713 singlestep_breakpoints_inserted_p = 0;
1715 ecs->random_signal = 0;
1717 ecs->ptid = saved_singlestep_ptid;
1718 context_switch (ecs);
1719 if (deprecated_context_hook)
1720 deprecated_context_hook (pid_to_thread_id (ecs->ptid));
1722 resume (1, TARGET_SIGNAL_0);
1723 prepare_to_wait (ecs);
1728 stepping_past_singlestep_breakpoint = 0;
1730 /* See if a thread hit a thread-specific breakpoint that was meant for
1731 another thread. If so, then step that thread past the breakpoint,
1734 if (stop_signal == TARGET_SIGNAL_TRAP)
1736 int thread_hop_needed = 0;
1738 /* Check if a regular breakpoint has been hit before checking
1739 for a potential single step breakpoint. Otherwise, GDB will
1740 not see this breakpoint hit when stepping onto breakpoints. */
1741 if (breakpoints_inserted && breakpoint_here_p (stop_pc))
1743 ecs->random_signal = 0;
1744 if (!breakpoint_thread_match (stop_pc, ecs->ptid))
1745 thread_hop_needed = 1;
1747 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1749 ecs->random_signal = 0;
1750 /* The call to in_thread_list is necessary because PTIDs sometimes
1751 change when we go from single-threaded to multi-threaded. If
1752 the singlestep_ptid is still in the list, assume that it is
1753 really different from ecs->ptid. */
1754 if (!ptid_equal (singlestep_ptid, ecs->ptid)
1755 && in_thread_list (singlestep_ptid))
1757 thread_hop_needed = 1;
1758 stepping_past_singlestep_breakpoint = 1;
1759 saved_singlestep_ptid = singlestep_ptid;
1763 if (thread_hop_needed)
1767 /* Saw a breakpoint, but it was hit by the wrong thread.
1770 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1772 /* Pull the single step breakpoints out of the target. */
1773 SOFTWARE_SINGLE_STEP (0, 0);
1774 singlestep_breakpoints_inserted_p = 0;
1777 remove_status = remove_breakpoints ();
1778 /* Did we fail to remove breakpoints? If so, try
1779 to set the PC past the bp. (There's at least
1780 one situation in which we can fail to remove
1781 the bp's: On HP-UX's that use ttrace, we can't
1782 change the address space of a vforking child
1783 process until the child exits (well, okay, not
1784 then either :-) or execs. */
1785 if (remove_status != 0)
1787 /* FIXME! This is obviously non-portable! */
1788 write_pc_pid (stop_pc + 4, ecs->ptid);
1789 /* We need to restart all the threads now,
1790 * unles we're running in scheduler-locked mode.
1791 * Use currently_stepping to determine whether to
1794 /* FIXME MVS: is there any reason not to call resume()? */
1795 if (scheduler_mode == schedlock_on)
1796 target_resume (ecs->ptid,
1797 currently_stepping (ecs), TARGET_SIGNAL_0);
1799 target_resume (RESUME_ALL,
1800 currently_stepping (ecs), TARGET_SIGNAL_0);
1801 prepare_to_wait (ecs);
1806 breakpoints_inserted = 0;
1807 if (!ptid_equal (inferior_ptid, ecs->ptid))
1808 context_switch (ecs);
1809 ecs->waiton_ptid = ecs->ptid;
1810 ecs->wp = &(ecs->ws);
1811 ecs->another_trap = 1;
1813 ecs->infwait_state = infwait_thread_hop_state;
1815 registers_changed ();
1819 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1821 sw_single_step_trap_p = 1;
1822 ecs->random_signal = 0;
1826 ecs->random_signal = 1;
1828 /* See if something interesting happened to the non-current thread. If
1829 so, then switch to that thread. */
1830 if (!ptid_equal (ecs->ptid, inferior_ptid))
1832 context_switch (ecs);
1834 if (deprecated_context_hook)
1835 deprecated_context_hook (pid_to_thread_id (ecs->ptid));
1837 flush_cached_frames ();
1840 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1842 /* Pull the single step breakpoints out of the target. */
1843 SOFTWARE_SINGLE_STEP (0, 0);
1844 singlestep_breakpoints_inserted_p = 0;
1847 /* If PC is pointing at a nullified instruction, then step beyond
1848 it so that the user won't be confused when GDB appears to be ready
1851 /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */
1852 if (INSTRUCTION_NULLIFIED)
1854 registers_changed ();
1855 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0);
1857 /* We may have received a signal that we want to pass to
1858 the inferior; therefore, we must not clobber the waitstatus
1861 ecs->infwait_state = infwait_nullified_state;
1862 ecs->waiton_ptid = ecs->ptid;
1863 ecs->wp = &(ecs->tmpstatus);
1864 prepare_to_wait (ecs);
1868 /* It may not be necessary to disable the watchpoint to stop over
1869 it. For example, the PA can (with some kernel cooperation)
1870 single step over a watchpoint without disabling the watchpoint. */
1871 if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1874 prepare_to_wait (ecs);
1878 /* It is far more common to need to disable a watchpoint to step
1879 the inferior over it. FIXME. What else might a debug
1880 register or page protection watchpoint scheme need here? */
1881 if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1883 /* At this point, we are stopped at an instruction which has
1884 attempted to write to a piece of memory under control of
1885 a watchpoint. The instruction hasn't actually executed
1886 yet. If we were to evaluate the watchpoint expression
1887 now, we would get the old value, and therefore no change
1888 would seem to have occurred.
1890 In order to make watchpoints work `right', we really need
1891 to complete the memory write, and then evaluate the
1892 watchpoint expression. The following code does that by
1893 removing the watchpoint (actually, all watchpoints and
1894 breakpoints), single-stepping the target, re-inserting
1895 watchpoints, and then falling through to let normal
1896 single-step processing handle proceed. Since this
1897 includes evaluating watchpoints, things will come to a
1898 stop in the correct manner. */
1900 remove_breakpoints ();
1901 registers_changed ();
1902 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */
1904 ecs->waiton_ptid = ecs->ptid;
1905 ecs->wp = &(ecs->ws);
1906 ecs->infwait_state = infwait_nonstep_watch_state;
1907 prepare_to_wait (ecs);
1911 /* It may be possible to simply continue after a watchpoint. */
1912 if (HAVE_CONTINUABLE_WATCHPOINT)
1913 STOPPED_BY_WATCHPOINT (ecs->ws);
1915 ecs->stop_func_start = 0;
1916 ecs->stop_func_end = 0;
1917 ecs->stop_func_name = 0;
1918 /* Don't care about return value; stop_func_start and stop_func_name
1919 will both be 0 if it doesn't work. */
1920 find_pc_partial_function (stop_pc, &ecs->stop_func_name,
1921 &ecs->stop_func_start, &ecs->stop_func_end);
1922 ecs->stop_func_start += FUNCTION_START_OFFSET;
1923 ecs->another_trap = 0;
1924 bpstat_clear (&stop_bpstat);
1926 stop_stack_dummy = 0;
1927 stop_print_frame = 1;
1928 ecs->random_signal = 0;
1929 stopped_by_random_signal = 0;
1930 breakpoints_failed = 0;
1932 /* Look at the cause of the stop, and decide what to do.
1933 The alternatives are:
1934 1) break; to really stop and return to the debugger,
1935 2) drop through to start up again
1936 (set ecs->another_trap to 1 to single step once)
1937 3) set ecs->random_signal to 1, and the decision between 1 and 2
1938 will be made according to the signal handling tables. */
1940 /* First, distinguish signals caused by the debugger from signals
1941 that have to do with the program's own actions. Note that
1942 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
1943 on the operating system version. Here we detect when a SIGILL or
1944 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
1945 something similar for SIGSEGV, since a SIGSEGV will be generated
1946 when we're trying to execute a breakpoint instruction on a
1947 non-executable stack. This happens for call dummy breakpoints
1948 for architectures like SPARC that place call dummies on the
1951 if (stop_signal == TARGET_SIGNAL_TRAP
1952 || (breakpoints_inserted &&
1953 (stop_signal == TARGET_SIGNAL_ILL
1954 || stop_signal == TARGET_SIGNAL_SEGV
1955 || stop_signal == TARGET_SIGNAL_EMT))
1956 || stop_soon == STOP_QUIETLY
1957 || stop_soon == STOP_QUIETLY_NO_SIGSTOP)
1959 if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap)
1961 stop_print_frame = 0;
1962 stop_stepping (ecs);
1966 /* This is originated from start_remote(), start_inferior() and
1967 shared libraries hook functions. */
1968 if (stop_soon == STOP_QUIETLY)
1970 stop_stepping (ecs);
1974 /* This originates from attach_command(). We need to overwrite
1975 the stop_signal here, because some kernels don't ignore a
1976 SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call.
1977 See more comments in inferior.h. */
1978 if (stop_soon == STOP_QUIETLY_NO_SIGSTOP)
1980 stop_stepping (ecs);
1981 if (stop_signal == TARGET_SIGNAL_STOP)
1982 stop_signal = TARGET_SIGNAL_0;
1986 /* Don't even think about breakpoints if just proceeded over a
1988 if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected)
1989 bpstat_clear (&stop_bpstat);
1992 /* See if there is a breakpoint at the current PC. */
1993 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid);
1995 /* Following in case break condition called a
1997 stop_print_frame = 1;
2000 /* NOTE: cagney/2003-03-29: These two checks for a random signal
2001 at one stage in the past included checks for an inferior
2002 function call's call dummy's return breakpoint. The original
2003 comment, that went with the test, read:
2005 ``End of a stack dummy. Some systems (e.g. Sony news) give
2006 another signal besides SIGTRAP, so check here as well as
2009 If someone ever tries to get get call dummys on a
2010 non-executable stack to work (where the target would stop
2011 with something like a SIGSEGV), then those tests might need
2012 to be re-instated. Given, however, that the tests were only
2013 enabled when momentary breakpoints were not being used, I
2014 suspect that it won't be the case.
2016 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
2017 be necessary for call dummies on a non-executable stack on
2020 if (stop_signal == TARGET_SIGNAL_TRAP)
2022 = !(bpstat_explains_signal (stop_bpstat)
2024 || (step_range_end && step_resume_breakpoint == NULL));
2027 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
2028 if (!ecs->random_signal)
2029 stop_signal = TARGET_SIGNAL_TRAP;
2033 /* When we reach this point, we've pretty much decided
2034 that the reason for stopping must've been a random
2035 (unexpected) signal. */
2038 ecs->random_signal = 1;
2040 process_event_stop_test:
2041 /* For the program's own signals, act according to
2042 the signal handling tables. */
2044 if (ecs->random_signal)
2046 /* Signal not for debugging purposes. */
2049 stopped_by_random_signal = 1;
2051 if (signal_print[stop_signal])
2054 target_terminal_ours_for_output ();
2055 print_stop_reason (SIGNAL_RECEIVED, stop_signal);
2057 if (signal_stop[stop_signal])
2059 stop_stepping (ecs);
2062 /* If not going to stop, give terminal back
2063 if we took it away. */
2065 target_terminal_inferior ();
2067 /* Clear the signal if it should not be passed. */
2068 if (signal_program[stop_signal] == 0)
2069 stop_signal = TARGET_SIGNAL_0;
2071 if (step_range_end != 0
2072 && stop_signal != TARGET_SIGNAL_0
2073 && stop_pc >= step_range_start && stop_pc < step_range_end
2074 && frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id))
2076 /* The inferior is about to take a signal that will take it
2077 out of the single step range. Set a breakpoint at the
2078 current PC (which is presumably where the signal handler
2079 will eventually return) and then allow the inferior to
2082 Note that this is only needed for a signal delivered
2083 while in the single-step range. Nested signals aren't a
2084 problem as they eventually all return. */
2085 insert_step_resume_breakpoint (get_current_frame (), ecs);
2091 /* Handle cases caused by hitting a breakpoint. */
2093 CORE_ADDR jmp_buf_pc;
2094 struct bpstat_what what;
2096 what = bpstat_what (stop_bpstat);
2098 if (what.call_dummy)
2100 stop_stack_dummy = 1;
2102 trap_expected_after_continue = 1;
2106 switch (what.main_action)
2108 case BPSTAT_WHAT_SET_LONGJMP_RESUME:
2109 /* If we hit the breakpoint at longjmp, disable it for the
2110 duration of this command. Then, install a temporary
2111 breakpoint at the target of the jmp_buf. */
2112 disable_longjmp_breakpoint ();
2113 remove_breakpoints ();
2114 breakpoints_inserted = 0;
2115 if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc))
2121 /* Need to blow away step-resume breakpoint, as it
2122 interferes with us */
2123 if (step_resume_breakpoint != NULL)
2125 delete_step_resume_breakpoint (&step_resume_breakpoint);
2129 /* FIXME - Need to implement nested temporary breakpoints */
2130 if (step_over_calls > 0)
2131 set_longjmp_resume_breakpoint (jmp_buf_pc, get_current_frame ());
2134 set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id);
2135 ecs->handling_longjmp = 1; /* FIXME */
2139 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME:
2140 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE:
2141 remove_breakpoints ();
2142 breakpoints_inserted = 0;
2144 /* FIXME - Need to implement nested temporary breakpoints */
2146 && (frame_id_inner (get_frame_id (get_current_frame ()),
2149 ecs->another_trap = 1;
2154 disable_longjmp_breakpoint ();
2155 ecs->handling_longjmp = 0; /* FIXME */
2156 if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME)
2158 /* else fallthrough */
2160 case BPSTAT_WHAT_SINGLE:
2161 if (breakpoints_inserted)
2163 remove_breakpoints ();
2165 breakpoints_inserted = 0;
2166 ecs->another_trap = 1;
2167 /* Still need to check other stuff, at least the case
2168 where we are stepping and step out of the right range. */
2171 case BPSTAT_WHAT_STOP_NOISY:
2172 stop_print_frame = 1;
2174 /* We are about to nuke the step_resume_breakpointt via the
2175 cleanup chain, so no need to worry about it here. */
2177 stop_stepping (ecs);
2180 case BPSTAT_WHAT_STOP_SILENT:
2181 stop_print_frame = 0;
2183 /* We are about to nuke the step_resume_breakpoin via the
2184 cleanup chain, so no need to worry about it here. */
2186 stop_stepping (ecs);
2189 case BPSTAT_WHAT_STEP_RESUME:
2190 /* This proably demands a more elegant solution, but, yeah
2193 This function's use of the simple variable
2194 step_resume_breakpoint doesn't seem to accomodate
2195 simultaneously active step-resume bp's, although the
2196 breakpoint list certainly can.
2198 If we reach here and step_resume_breakpoint is already
2199 NULL, then apparently we have multiple active
2200 step-resume bp's. We'll just delete the breakpoint we
2201 stopped at, and carry on.
2203 Correction: what the code currently does is delete a
2204 step-resume bp, but it makes no effort to ensure that
2205 the one deleted is the one currently stopped at. MVS */
2207 if (step_resume_breakpoint == NULL)
2209 step_resume_breakpoint =
2210 bpstat_find_step_resume_breakpoint (stop_bpstat);
2212 delete_step_resume_breakpoint (&step_resume_breakpoint);
2215 case BPSTAT_WHAT_THROUGH_SIGTRAMP:
2216 /* If were waiting for a trap, hitting the step_resume_break
2217 doesn't count as getting it. */
2219 ecs->another_trap = 1;
2222 case BPSTAT_WHAT_CHECK_SHLIBS:
2223 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK:
2226 /* Remove breakpoints, we eventually want to step over the
2227 shlib event breakpoint, and SOLIB_ADD might adjust
2228 breakpoint addresses via breakpoint_re_set. */
2229 if (breakpoints_inserted)
2230 remove_breakpoints ();
2231 breakpoints_inserted = 0;
2233 /* Check for any newly added shared libraries if we're
2234 supposed to be adding them automatically. Switch
2235 terminal for any messages produced by
2236 breakpoint_re_set. */
2237 target_terminal_ours_for_output ();
2238 /* NOTE: cagney/2003-11-25: Make certain that the target
2239 stack's section table is kept up-to-date. Architectures,
2240 (e.g., PPC64), use the section table to perform
2241 operations such as address => section name and hence
2242 require the table to contain all sections (including
2243 those found in shared libraries). */
2244 /* NOTE: cagney/2003-11-25: Pass current_target and not
2245 exec_ops to SOLIB_ADD. This is because current GDB is
2246 only tooled to propagate section_table changes out from
2247 the "current_target" (see target_resize_to_sections), and
2248 not up from the exec stratum. This, of course, isn't
2249 right. "infrun.c" should only interact with the
2250 exec/process stratum, instead relying on the target stack
2251 to propagate relevant changes (stop, section table
2252 changed, ...) up to other layers. */
2253 SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add);
2254 target_terminal_inferior ();
2256 /* Try to reenable shared library breakpoints, additional
2257 code segments in shared libraries might be mapped in now. */
2258 re_enable_breakpoints_in_shlibs ();
2260 /* If requested, stop when the dynamic linker notifies
2261 gdb of events. This allows the user to get control
2262 and place breakpoints in initializer routines for
2263 dynamically loaded objects (among other things). */
2264 if (stop_on_solib_events || stop_stack_dummy)
2266 stop_stepping (ecs);
2270 /* If we stopped due to an explicit catchpoint, then the
2271 (see above) call to SOLIB_ADD pulled in any symbols
2272 from a newly-loaded library, if appropriate.
2274 We do want the inferior to stop, but not where it is
2275 now, which is in the dynamic linker callback. Rather,
2276 we would like it stop in the user's program, just after
2277 the call that caused this catchpoint to trigger. That
2278 gives the user a more useful vantage from which to
2279 examine their program's state. */
2280 else if (what.main_action ==
2281 BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK)
2283 /* ??rehrauer: If I could figure out how to get the
2284 right return PC from here, we could just set a temp
2285 breakpoint and resume. I'm not sure we can without
2286 cracking open the dld's shared libraries and sniffing
2287 their unwind tables and text/data ranges, and that's
2288 not a terribly portable notion.
2290 Until that time, we must step the inferior out of the
2291 dld callback, and also out of the dld itself (and any
2292 code or stubs in libdld.sl, such as "shl_load" and
2293 friends) until we reach non-dld code. At that point,
2294 we can stop stepping. */
2295 bpstat_get_triggered_catchpoints (stop_bpstat,
2297 stepping_through_solib_catchpoints);
2298 ecs->stepping_through_solib_after_catch = 1;
2300 /* Be sure to lift all breakpoints, so the inferior does
2301 actually step past this point... */
2302 ecs->another_trap = 1;
2307 /* We want to step over this breakpoint, then keep going. */
2308 ecs->another_trap = 1;
2315 case BPSTAT_WHAT_LAST:
2316 /* Not a real code, but listed here to shut up gcc -Wall. */
2318 case BPSTAT_WHAT_KEEP_CHECKING:
2323 /* We come here if we hit a breakpoint but should not
2324 stop for it. Possibly we also were stepping
2325 and should stop for that. So fall through and
2326 test for stepping. But, if not stepping,
2329 /* Are we stepping to get the inferior out of the dynamic
2330 linker's hook (and possibly the dld itself) after catching
2332 if (ecs->stepping_through_solib_after_catch)
2334 #if defined(SOLIB_ADD)
2335 /* Have we reached our destination? If not, keep going. */
2336 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc))
2338 ecs->another_trap = 1;
2343 /* Else, stop and report the catchpoint(s) whose triggering
2344 caused us to begin stepping. */
2345 ecs->stepping_through_solib_after_catch = 0;
2346 bpstat_clear (&stop_bpstat);
2347 stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints);
2348 bpstat_clear (&ecs->stepping_through_solib_catchpoints);
2349 stop_print_frame = 1;
2350 stop_stepping (ecs);
2354 if (step_resume_breakpoint)
2356 /* Having a step-resume breakpoint overrides anything
2357 else having to do with stepping commands until
2358 that breakpoint is reached. */
2363 if (step_range_end == 0)
2365 /* Likewise if we aren't even stepping. */
2370 /* If stepping through a line, keep going if still within it.
2372 Note that step_range_end is the address of the first instruction
2373 beyond the step range, and NOT the address of the last instruction
2375 if (stop_pc >= step_range_start && stop_pc < step_range_end)
2381 /* We stepped out of the stepping range. */
2383 /* If we are stepping at the source level and entered the runtime
2384 loader dynamic symbol resolution code, we keep on single stepping
2385 until we exit the run time loader code and reach the callee's
2387 if (step_over_calls == STEP_OVER_UNDEBUGGABLE
2388 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc))
2390 CORE_ADDR pc_after_resolver =
2391 gdbarch_skip_solib_resolver (current_gdbarch, stop_pc);
2393 if (pc_after_resolver)
2395 /* Set up a step-resume breakpoint at the address
2396 indicated by SKIP_SOLIB_RESOLVER. */
2397 struct symtab_and_line sr_sal;
2399 sr_sal.pc = pc_after_resolver;
2401 check_for_old_step_resume_breakpoint ();
2402 step_resume_breakpoint =
2403 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2404 if (breakpoints_inserted)
2405 insert_breakpoints ();
2412 if (step_over_calls == STEP_OVER_UNDEBUGGABLE
2413 && ecs->stop_func_name == NULL)
2415 /* There is no symbol, not even a minimal symbol, corresponding
2416 to the address where we just stopped. So we just stepped
2417 inside undebuggable code. Since we want to step over this
2418 kind of code, we keep going until the inferior returns from
2419 the current function. */
2420 handle_step_into_function (ecs);
2424 if (step_range_end != 1
2425 && (step_over_calls == STEP_OVER_UNDEBUGGABLE
2426 || step_over_calls == STEP_OVER_ALL)
2427 && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME)
2429 /* The inferior, while doing a "step" or "next", has ended up in
2430 a signal trampoline (either by a signal being delivered or by
2431 the signal handler returning). Just single-step until the
2432 inferior leaves the trampoline (either by calling the handler
2438 if (frame_id_eq (get_frame_id (get_prev_frame (get_current_frame ())),
2441 /* It's a subroutine call. */
2442 handle_step_into_function (ecs);
2446 /* We've wandered out of the step range. */
2448 ecs->sal = find_pc_line (stop_pc, 0);
2450 if (step_range_end == 1)
2452 /* It is stepi or nexti. We always want to stop stepping after
2455 print_stop_reason (END_STEPPING_RANGE, 0);
2456 stop_stepping (ecs);
2460 /* If we're in the return path from a shared library trampoline,
2461 we want to proceed through the trampoline when stepping. */
2462 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name))
2464 /* Determine where this trampoline returns. */
2465 CORE_ADDR real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc);
2467 /* Only proceed through if we know where it's going. */
2470 /* And put the step-breakpoint there and go until there. */
2471 struct symtab_and_line sr_sal;
2473 init_sal (&sr_sal); /* initialize to zeroes */
2474 sr_sal.pc = real_stop_pc;
2475 sr_sal.section = find_pc_overlay (sr_sal.pc);
2476 /* Do not specify what the fp should be when we stop
2477 since on some machines the prologue
2478 is where the new fp value is established. */
2479 check_for_old_step_resume_breakpoint ();
2480 step_resume_breakpoint =
2481 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2482 if (breakpoints_inserted)
2483 insert_breakpoints ();
2485 /* Restart without fiddling with the step ranges or
2492 if (ecs->sal.line == 0)
2494 /* We have no line number information. That means to stop
2495 stepping (does this always happen right after one instruction,
2496 when we do "s" in a function with no line numbers,
2497 or can this happen as a result of a return or longjmp?). */
2499 print_stop_reason (END_STEPPING_RANGE, 0);
2500 stop_stepping (ecs);
2504 if ((stop_pc == ecs->sal.pc)
2505 && (ecs->current_line != ecs->sal.line
2506 || ecs->current_symtab != ecs->sal.symtab))
2508 /* We are at the start of a different line. So stop. Note that
2509 we don't stop if we step into the middle of a different line.
2510 That is said to make things like for (;;) statements work
2513 print_stop_reason (END_STEPPING_RANGE, 0);
2514 stop_stepping (ecs);
2518 /* We aren't done stepping.
2520 Optimize by setting the stepping range to the line.
2521 (We might not be in the original line, but if we entered a
2522 new line in mid-statement, we continue stepping. This makes
2523 things like for(;;) statements work better.) */
2525 if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end)
2527 /* If this is the last line of the function, don't keep stepping
2528 (it would probably step us out of the function).
2529 This is particularly necessary for a one-line function,
2530 in which after skipping the prologue we better stop even though
2531 we will be in mid-line. */
2533 print_stop_reason (END_STEPPING_RANGE, 0);
2534 stop_stepping (ecs);
2537 step_range_start = ecs->sal.pc;
2538 step_range_end = ecs->sal.end;
2539 step_frame_id = get_frame_id (get_current_frame ());
2540 ecs->current_line = ecs->sal.line;
2541 ecs->current_symtab = ecs->sal.symtab;
2543 /* In the case where we just stepped out of a function into the
2544 middle of a line of the caller, continue stepping, but
2545 step_frame_id must be modified to current frame */
2547 /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too
2548 generous. It will trigger on things like a step into a frameless
2549 stackless leaf function. I think the logic should instead look
2550 at the unwound frame ID has that should give a more robust
2551 indication of what happened. */
2552 if (step-ID == current-ID)
2553 still stepping in same function;
2554 else if (step-ID == unwind (current-ID))
2555 stepped into a function;
2557 stepped out of a function;
2558 /* Of course this assumes that the frame ID unwind code is robust
2559 and we're willing to introduce frame unwind logic into this
2560 function. Fortunately, those days are nearly upon us. */
2563 struct frame_id current_frame = get_frame_id (get_current_frame ());
2564 if (!(frame_id_inner (current_frame, step_frame_id)))
2565 step_frame_id = current_frame;
2571 /* Are we in the middle of stepping? */
2574 currently_stepping (struct execution_control_state *ecs)
2576 return ((!ecs->handling_longjmp
2577 && ((step_range_end && step_resume_breakpoint == NULL)
2579 || ecs->stepping_through_solib_after_catch
2580 || bpstat_should_step ());
2583 /* Subroutine call with source code we should not step over. Do step
2584 to the first line of code in it. */
2587 step_into_function (struct execution_control_state *ecs)
2590 struct symtab_and_line sr_sal;
2592 s = find_pc_symtab (stop_pc);
2593 if (s && s->language != language_asm)
2594 ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start);
2596 ecs->sal = find_pc_line (ecs->stop_func_start, 0);
2597 /* Use the step_resume_break to step until the end of the prologue,
2598 even if that involves jumps (as it seems to on the vax under
2600 /* If the prologue ends in the middle of a source line, continue to
2601 the end of that source line (if it is still within the function).
2602 Otherwise, just go to end of prologue. */
2604 && ecs->sal.pc != ecs->stop_func_start
2605 && ecs->sal.end < ecs->stop_func_end)
2606 ecs->stop_func_start = ecs->sal.end;
2608 /* Architectures which require breakpoint adjustment might not be able
2609 to place a breakpoint at the computed address. If so, the test
2610 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
2611 ecs->stop_func_start to an address at which a breakpoint may be
2612 legitimately placed.
2614 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
2615 made, GDB will enter an infinite loop when stepping through
2616 optimized code consisting of VLIW instructions which contain
2617 subinstructions corresponding to different source lines. On
2618 FR-V, it's not permitted to place a breakpoint on any but the
2619 first subinstruction of a VLIW instruction. When a breakpoint is
2620 set, GDB will adjust the breakpoint address to the beginning of
2621 the VLIW instruction. Thus, we need to make the corresponding
2622 adjustment here when computing the stop address. */
2624 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch))
2626 ecs->stop_func_start
2627 = gdbarch_adjust_breakpoint_address (current_gdbarch,
2628 ecs->stop_func_start);
2631 if (ecs->stop_func_start == stop_pc)
2633 /* We are already there: stop now. */
2635 print_stop_reason (END_STEPPING_RANGE, 0);
2636 stop_stepping (ecs);
2641 /* Put the step-breakpoint there and go until there. */
2642 init_sal (&sr_sal); /* initialize to zeroes */
2643 sr_sal.pc = ecs->stop_func_start;
2644 sr_sal.section = find_pc_overlay (ecs->stop_func_start);
2645 /* Do not specify what the fp should be when we stop since on
2646 some machines the prologue is where the new fp value is
2648 check_for_old_step_resume_breakpoint ();
2649 step_resume_breakpoint =
2650 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2651 if (breakpoints_inserted)
2652 insert_breakpoints ();
2654 /* And make sure stepping stops right away then. */
2655 step_range_end = step_range_start;
2660 /* The inferior, as a result of a function call (has left) or signal
2661 (about to leave) the single-step range. Set a momentary breakpoint
2662 within the step range where the inferior is expected to later
2666 insert_step_resume_breakpoint (struct frame_info *step_frame,
2667 struct execution_control_state *ecs)
2669 struct symtab_and_line sr_sal;
2671 /* This is only used within the step-resume range/frame. */
2672 gdb_assert (frame_id_eq (step_frame_id, get_frame_id (step_frame)));
2673 gdb_assert (step_range_end != 0);
2674 /* Remember, if the call instruction is the last in the step range,
2675 the breakpoint will land just beyond that. Hence ``<=
2676 step_range_end''. Also, ignore check when "nexti". */
2677 gdb_assert (step_range_start == step_range_end
2678 || (get_frame_pc (step_frame) >= step_range_start
2679 && get_frame_pc (step_frame) <= step_range_end));
2681 init_sal (&sr_sal); /* initialize to zeros */
2683 sr_sal.pc = ADDR_BITS_REMOVE (get_frame_pc (step_frame));
2684 sr_sal.section = find_pc_overlay (sr_sal.pc);
2686 check_for_old_step_resume_breakpoint ();
2688 step_resume_breakpoint
2689 = set_momentary_breakpoint (sr_sal, get_frame_id (step_frame),
2692 if (breakpoints_inserted)
2693 insert_breakpoints ();
2697 stop_stepping (struct execution_control_state *ecs)
2699 /* Let callers know we don't want to wait for the inferior anymore. */
2700 ecs->wait_some_more = 0;
2703 /* This function handles various cases where we need to continue
2704 waiting for the inferior. */
2705 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2708 keep_going (struct execution_control_state *ecs)
2710 /* Save the pc before execution, to compare with pc after stop. */
2711 prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */
2713 /* If we did not do break;, it means we should keep running the
2714 inferior and not return to debugger. */
2716 if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP)
2718 /* We took a signal (which we are supposed to pass through to
2719 the inferior, else we'd have done a break above) and we
2720 haven't yet gotten our trap. Simply continue. */
2721 resume (currently_stepping (ecs), stop_signal);
2725 /* Either the trap was not expected, but we are continuing
2726 anyway (the user asked that this signal be passed to the
2729 The signal was SIGTRAP, e.g. it was our signal, but we
2730 decided we should resume from it.
2732 We're going to run this baby now!
2734 Insert breakpoints now, unless we are trying to one-proceed
2735 past a breakpoint. */
2736 /* If we've just finished a special step resume and we don't
2737 want to hit a breakpoint, pull em out. */
2738 if (step_resume_breakpoint == NULL
2739 && ecs->remove_breakpoints_on_following_step)
2741 ecs->remove_breakpoints_on_following_step = 0;
2742 remove_breakpoints ();
2743 breakpoints_inserted = 0;
2745 else if (!breakpoints_inserted && !ecs->another_trap)
2747 breakpoints_failed = insert_breakpoints ();
2748 if (breakpoints_failed)
2750 stop_stepping (ecs);
2753 breakpoints_inserted = 1;
2756 trap_expected = ecs->another_trap;
2758 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2759 specifies that such a signal should be delivered to the
2762 Typically, this would occure when a user is debugging a
2763 target monitor on a simulator: the target monitor sets a
2764 breakpoint; the simulator encounters this break-point and
2765 halts the simulation handing control to GDB; GDB, noteing
2766 that the break-point isn't valid, returns control back to the
2767 simulator; the simulator then delivers the hardware
2768 equivalent of a SIGNAL_TRAP to the program being debugged. */
2770 if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal])
2771 stop_signal = TARGET_SIGNAL_0;
2774 resume (currently_stepping (ecs), stop_signal);
2777 prepare_to_wait (ecs);
2780 /* This function normally comes after a resume, before
2781 handle_inferior_event exits. It takes care of any last bits of
2782 housekeeping, and sets the all-important wait_some_more flag. */
2785 prepare_to_wait (struct execution_control_state *ecs)
2787 if (ecs->infwait_state == infwait_normal_state)
2789 overlay_cache_invalid = 1;
2791 /* We have to invalidate the registers BEFORE calling
2792 target_wait because they can be loaded from the target while
2793 in target_wait. This makes remote debugging a bit more
2794 efficient for those targets that provide critical registers
2795 as part of their normal status mechanism. */
2797 registers_changed ();
2798 ecs->waiton_ptid = pid_to_ptid (-1);
2799 ecs->wp = &(ecs->ws);
2801 /* This is the old end of the while loop. Let everybody know we
2802 want to wait for the inferior some more and get called again
2804 ecs->wait_some_more = 1;
2807 /* Print why the inferior has stopped. We always print something when
2808 the inferior exits, or receives a signal. The rest of the cases are
2809 dealt with later on in normal_stop() and print_it_typical(). Ideally
2810 there should be a call to this function from handle_inferior_event()
2811 each time stop_stepping() is called.*/
2813 print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info)
2815 switch (stop_reason)
2818 /* We don't deal with these cases from handle_inferior_event()
2821 case END_STEPPING_RANGE:
2822 /* We are done with a step/next/si/ni command. */
2823 /* For now print nothing. */
2824 /* Print a message only if not in the middle of doing a "step n"
2825 operation for n > 1 */
2826 if (!step_multi || !stop_step)
2827 if (ui_out_is_mi_like_p (uiout))
2828 ui_out_field_string (uiout, "reason", "end-stepping-range");
2830 case BREAKPOINT_HIT:
2831 /* We found a breakpoint. */
2832 /* For now print nothing. */
2835 /* The inferior was terminated by a signal. */
2836 annotate_signalled ();
2837 if (ui_out_is_mi_like_p (uiout))
2838 ui_out_field_string (uiout, "reason", "exited-signalled");
2839 ui_out_text (uiout, "\nProgram terminated with signal ");
2840 annotate_signal_name ();
2841 ui_out_field_string (uiout, "signal-name",
2842 target_signal_to_name (stop_info));
2843 annotate_signal_name_end ();
2844 ui_out_text (uiout, ", ");
2845 annotate_signal_string ();
2846 ui_out_field_string (uiout, "signal-meaning",
2847 target_signal_to_string (stop_info));
2848 annotate_signal_string_end ();
2849 ui_out_text (uiout, ".\n");
2850 ui_out_text (uiout, "The program no longer exists.\n");
2853 /* The inferior program is finished. */
2854 annotate_exited (stop_info);
2857 if (ui_out_is_mi_like_p (uiout))
2858 ui_out_field_string (uiout, "reason", "exited");
2859 ui_out_text (uiout, "\nProgram exited with code ");
2860 ui_out_field_fmt (uiout, "exit-code", "0%o",
2861 (unsigned int) stop_info);
2862 ui_out_text (uiout, ".\n");
2866 if (ui_out_is_mi_like_p (uiout))
2867 ui_out_field_string (uiout, "reason", "exited-normally");
2868 ui_out_text (uiout, "\nProgram exited normally.\n");
2871 case SIGNAL_RECEIVED:
2872 /* Signal received. The signal table tells us to print about
2875 ui_out_text (uiout, "\nProgram received signal ");
2876 annotate_signal_name ();
2877 if (ui_out_is_mi_like_p (uiout))
2878 ui_out_field_string (uiout, "reason", "signal-received");
2879 ui_out_field_string (uiout, "signal-name",
2880 target_signal_to_name (stop_info));
2881 annotate_signal_name_end ();
2882 ui_out_text (uiout, ", ");
2883 annotate_signal_string ();
2884 ui_out_field_string (uiout, "signal-meaning",
2885 target_signal_to_string (stop_info));
2886 annotate_signal_string_end ();
2887 ui_out_text (uiout, ".\n");
2890 internal_error (__FILE__, __LINE__,
2891 "print_stop_reason: unrecognized enum value");
2897 /* Here to return control to GDB when the inferior stops for real.
2898 Print appropriate messages, remove breakpoints, give terminal our modes.
2900 STOP_PRINT_FRAME nonzero means print the executing frame
2901 (pc, function, args, file, line number and line text).
2902 BREAKPOINTS_FAILED nonzero means stop was due to error
2903 attempting to insert breakpoints. */
2908 struct target_waitstatus last;
2911 get_last_target_status (&last_ptid, &last);
2913 /* As with the notification of thread events, we want to delay
2914 notifying the user that we've switched thread context until
2915 the inferior actually stops.
2917 There's no point in saying anything if the inferior has exited.
2918 Note that SIGNALLED here means "exited with a signal", not
2919 "received a signal". */
2920 if (!ptid_equal (previous_inferior_ptid, inferior_ptid)
2921 && target_has_execution
2922 && last.kind != TARGET_WAITKIND_SIGNALLED
2923 && last.kind != TARGET_WAITKIND_EXITED)
2925 target_terminal_ours_for_output ();
2926 printf_filtered ("[Switching to %s]\n",
2927 target_pid_or_tid_to_str (inferior_ptid));
2928 previous_inferior_ptid = inferior_ptid;
2931 /* NOTE drow/2004-01-17: Is this still necessary? */
2932 /* Make sure that the current_frame's pc is correct. This
2933 is a correction for setting up the frame info before doing
2934 DECR_PC_AFTER_BREAK */
2935 if (target_has_execution)
2936 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
2937 DECR_PC_AFTER_BREAK, the program counter can change. Ask the
2938 frame code to check for this and sort out any resultant mess.
2939 DECR_PC_AFTER_BREAK needs to just go away. */
2940 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
2942 if (target_has_execution && breakpoints_inserted)
2944 if (remove_breakpoints ())
2946 target_terminal_ours_for_output ();
2947 printf_filtered ("Cannot remove breakpoints because ");
2948 printf_filtered ("program is no longer writable.\n");
2949 printf_filtered ("It might be running in another process.\n");
2950 printf_filtered ("Further execution is probably impossible.\n");
2953 breakpoints_inserted = 0;
2955 /* Delete the breakpoint we stopped at, if it wants to be deleted.
2956 Delete any breakpoint that is to be deleted at the next stop. */
2958 breakpoint_auto_delete (stop_bpstat);
2960 /* If an auto-display called a function and that got a signal,
2961 delete that auto-display to avoid an infinite recursion. */
2963 if (stopped_by_random_signal)
2964 disable_current_display ();
2966 /* Don't print a message if in the middle of doing a "step n"
2967 operation for n > 1 */
2968 if (step_multi && stop_step)
2971 target_terminal_ours ();
2973 /* Look up the hook_stop and run it (CLI internally handles problem
2974 of stop_command's pre-hook not existing). */
2976 catch_errors (hook_stop_stub, stop_command,
2977 "Error while running hook_stop:\n", RETURN_MASK_ALL);
2979 if (!target_has_stack)
2985 /* Select innermost stack frame - i.e., current frame is frame 0,
2986 and current location is based on that.
2987 Don't do this on return from a stack dummy routine,
2988 or if the program has exited. */
2990 if (!stop_stack_dummy)
2992 select_frame (get_current_frame ());
2994 /* Print current location without a level number, if
2995 we have changed functions or hit a breakpoint.
2996 Print source line if we have one.
2997 bpstat_print() contains the logic deciding in detail
2998 what to print, based on the event(s) that just occurred. */
3000 if (stop_print_frame && deprecated_selected_frame)
3004 int do_frame_printing = 1;
3006 bpstat_ret = bpstat_print (stop_bpstat);
3010 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3011 (or should) carry around the function and does (or
3012 should) use that when doing a frame comparison. */
3014 && frame_id_eq (step_frame_id,
3015 get_frame_id (get_current_frame ()))
3016 && step_start_function == find_pc_function (stop_pc))
3017 source_flag = SRC_LINE; /* finished step, just print source line */
3019 source_flag = SRC_AND_LOC; /* print location and source line */
3021 case PRINT_SRC_AND_LOC:
3022 source_flag = SRC_AND_LOC; /* print location and source line */
3024 case PRINT_SRC_ONLY:
3025 source_flag = SRC_LINE;
3028 source_flag = SRC_LINE; /* something bogus */
3029 do_frame_printing = 0;
3032 internal_error (__FILE__, __LINE__, "Unknown value.");
3034 /* For mi, have the same behavior every time we stop:
3035 print everything but the source line. */
3036 if (ui_out_is_mi_like_p (uiout))
3037 source_flag = LOC_AND_ADDRESS;
3039 if (ui_out_is_mi_like_p (uiout))
3040 ui_out_field_int (uiout, "thread-id",
3041 pid_to_thread_id (inferior_ptid));
3042 /* The behavior of this routine with respect to the source
3044 SRC_LINE: Print only source line
3045 LOCATION: Print only location
3046 SRC_AND_LOC: Print location and source line */
3047 if (do_frame_printing)
3048 print_stack_frame (get_selected_frame (), 0, source_flag);
3050 /* Display the auto-display expressions. */
3055 /* Save the function value return registers, if we care.
3056 We might be about to restore their previous contents. */
3057 if (proceed_to_finish)
3058 /* NB: The copy goes through to the target picking up the value of
3059 all the registers. */
3060 regcache_cpy (stop_registers, current_regcache);
3062 if (stop_stack_dummy)
3064 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3065 ends with a setting of the current frame, so we can use that
3067 frame_pop (get_current_frame ());
3068 /* Set stop_pc to what it was before we called the function.
3069 Can't rely on restore_inferior_status because that only gets
3070 called if we don't stop in the called function. */
3071 stop_pc = read_pc ();
3072 select_frame (get_current_frame ());
3076 annotate_stopped ();
3077 observer_notify_normal_stop (stop_bpstat);
3081 hook_stop_stub (void *cmd)
3083 execute_cmd_pre_hook ((struct cmd_list_element *) cmd);
3088 signal_stop_state (int signo)
3090 return signal_stop[signo];
3094 signal_print_state (int signo)
3096 return signal_print[signo];
3100 signal_pass_state (int signo)
3102 return signal_program[signo];
3106 signal_stop_update (int signo, int state)
3108 int ret = signal_stop[signo];
3109 signal_stop[signo] = state;
3114 signal_print_update (int signo, int state)
3116 int ret = signal_print[signo];
3117 signal_print[signo] = state;
3122 signal_pass_update (int signo, int state)
3124 int ret = signal_program[signo];
3125 signal_program[signo] = state;
3130 sig_print_header (void)
3133 Signal Stop\tPrint\tPass to program\tDescription\n");
3137 sig_print_info (enum target_signal oursig)
3139 char *name = target_signal_to_name (oursig);
3140 int name_padding = 13 - strlen (name);
3142 if (name_padding <= 0)
3145 printf_filtered ("%s", name);
3146 printf_filtered ("%*.*s ", name_padding, name_padding, " ");
3147 printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No");
3148 printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No");
3149 printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No");
3150 printf_filtered ("%s\n", target_signal_to_string (oursig));
3153 /* Specify how various signals in the inferior should be handled. */
3156 handle_command (char *args, int from_tty)
3159 int digits, wordlen;
3160 int sigfirst, signum, siglast;
3161 enum target_signal oursig;
3164 unsigned char *sigs;
3165 struct cleanup *old_chain;
3169 error_no_arg ("signal to handle");
3172 /* Allocate and zero an array of flags for which signals to handle. */
3174 nsigs = (int) TARGET_SIGNAL_LAST;
3175 sigs = (unsigned char *) alloca (nsigs);
3176 memset (sigs, 0, nsigs);
3178 /* Break the command line up into args. */
3180 argv = buildargv (args);
3185 old_chain = make_cleanup_freeargv (argv);
3187 /* Walk through the args, looking for signal oursigs, signal names, and
3188 actions. Signal numbers and signal names may be interspersed with
3189 actions, with the actions being performed for all signals cumulatively
3190 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3192 while (*argv != NULL)
3194 wordlen = strlen (*argv);
3195 for (digits = 0; isdigit ((*argv)[digits]); digits++)
3199 sigfirst = siglast = -1;
3201 if (wordlen >= 1 && !strncmp (*argv, "all", wordlen))
3203 /* Apply action to all signals except those used by the
3204 debugger. Silently skip those. */
3207 siglast = nsigs - 1;
3209 else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen))
3211 SET_SIGS (nsigs, sigs, signal_stop);
3212 SET_SIGS (nsigs, sigs, signal_print);
3214 else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen))
3216 UNSET_SIGS (nsigs, sigs, signal_program);
3218 else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen))
3220 SET_SIGS (nsigs, sigs, signal_print);
3222 else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen))
3224 SET_SIGS (nsigs, sigs, signal_program);
3226 else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen))
3228 UNSET_SIGS (nsigs, sigs, signal_stop);
3230 else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen))
3232 SET_SIGS (nsigs, sigs, signal_program);
3234 else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen))
3236 UNSET_SIGS (nsigs, sigs, signal_print);
3237 UNSET_SIGS (nsigs, sigs, signal_stop);
3239 else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen))
3241 UNSET_SIGS (nsigs, sigs, signal_program);
3243 else if (digits > 0)
3245 /* It is numeric. The numeric signal refers to our own
3246 internal signal numbering from target.h, not to host/target
3247 signal number. This is a feature; users really should be
3248 using symbolic names anyway, and the common ones like
3249 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3251 sigfirst = siglast = (int)
3252 target_signal_from_command (atoi (*argv));
3253 if ((*argv)[digits] == '-')
3256 target_signal_from_command (atoi ((*argv) + digits + 1));
3258 if (sigfirst > siglast)
3260 /* Bet he didn't figure we'd think of this case... */
3268 oursig = target_signal_from_name (*argv);
3269 if (oursig != TARGET_SIGNAL_UNKNOWN)
3271 sigfirst = siglast = (int) oursig;
3275 /* Not a number and not a recognized flag word => complain. */
3276 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv);
3280 /* If any signal numbers or symbol names were found, set flags for
3281 which signals to apply actions to. */
3283 for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++)
3285 switch ((enum target_signal) signum)
3287 case TARGET_SIGNAL_TRAP:
3288 case TARGET_SIGNAL_INT:
3289 if (!allsigs && !sigs[signum])
3291 if (query ("%s is used by the debugger.\n\
3292 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum)))
3298 printf_unfiltered ("Not confirmed, unchanged.\n");
3299 gdb_flush (gdb_stdout);
3303 case TARGET_SIGNAL_0:
3304 case TARGET_SIGNAL_DEFAULT:
3305 case TARGET_SIGNAL_UNKNOWN:
3306 /* Make sure that "all" doesn't print these. */
3317 target_notice_signals (inferior_ptid);
3321 /* Show the results. */
3322 sig_print_header ();
3323 for (signum = 0; signum < nsigs; signum++)
3327 sig_print_info (signum);
3332 do_cleanups (old_chain);
3336 xdb_handle_command (char *args, int from_tty)
3339 struct cleanup *old_chain;
3341 /* Break the command line up into args. */
3343 argv = buildargv (args);
3348 old_chain = make_cleanup_freeargv (argv);
3349 if (argv[1] != (char *) NULL)
3354 bufLen = strlen (argv[0]) + 20;
3355 argBuf = (char *) xmalloc (bufLen);
3359 enum target_signal oursig;
3361 oursig = target_signal_from_name (argv[0]);
3362 memset (argBuf, 0, bufLen);
3363 if (strcmp (argv[1], "Q") == 0)
3364 sprintf (argBuf, "%s %s", argv[0], "noprint");
3367 if (strcmp (argv[1], "s") == 0)
3369 if (!signal_stop[oursig])
3370 sprintf (argBuf, "%s %s", argv[0], "stop");
3372 sprintf (argBuf, "%s %s", argv[0], "nostop");
3374 else if (strcmp (argv[1], "i") == 0)
3376 if (!signal_program[oursig])
3377 sprintf (argBuf, "%s %s", argv[0], "pass");
3379 sprintf (argBuf, "%s %s", argv[0], "nopass");
3381 else if (strcmp (argv[1], "r") == 0)
3383 if (!signal_print[oursig])
3384 sprintf (argBuf, "%s %s", argv[0], "print");
3386 sprintf (argBuf, "%s %s", argv[0], "noprint");
3392 handle_command (argBuf, from_tty);
3394 printf_filtered ("Invalid signal handling flag.\n");
3399 do_cleanups (old_chain);
3402 /* Print current contents of the tables set by the handle command.
3403 It is possible we should just be printing signals actually used
3404 by the current target (but for things to work right when switching
3405 targets, all signals should be in the signal tables). */
3408 signals_info (char *signum_exp, int from_tty)
3410 enum target_signal oursig;
3411 sig_print_header ();
3415 /* First see if this is a symbol name. */
3416 oursig = target_signal_from_name (signum_exp);
3417 if (oursig == TARGET_SIGNAL_UNKNOWN)
3419 /* No, try numeric. */
3421 target_signal_from_command (parse_and_eval_long (signum_exp));
3423 sig_print_info (oursig);
3427 printf_filtered ("\n");
3428 /* These ugly casts brought to you by the native VAX compiler. */
3429 for (oursig = TARGET_SIGNAL_FIRST;
3430 (int) oursig < (int) TARGET_SIGNAL_LAST;
3431 oursig = (enum target_signal) ((int) oursig + 1))
3435 if (oursig != TARGET_SIGNAL_UNKNOWN
3436 && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0)
3437 sig_print_info (oursig);
3440 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
3443 struct inferior_status
3445 enum target_signal stop_signal;
3449 int stop_stack_dummy;
3450 int stopped_by_random_signal;
3452 CORE_ADDR step_range_start;
3453 CORE_ADDR step_range_end;
3454 struct frame_id step_frame_id;
3455 enum step_over_calls_kind step_over_calls;
3456 CORE_ADDR step_resume_break_address;
3457 int stop_after_trap;
3459 struct regcache *stop_registers;
3461 /* These are here because if call_function_by_hand has written some
3462 registers and then decides to call error(), we better not have changed
3464 struct regcache *registers;
3466 /* A frame unique identifier. */
3467 struct frame_id selected_frame_id;
3469 int breakpoint_proceeded;
3470 int restore_stack_info;
3471 int proceed_to_finish;
3475 write_inferior_status_register (struct inferior_status *inf_status, int regno,
3478 int size = DEPRECATED_REGISTER_RAW_SIZE (regno);
3479 void *buf = alloca (size);
3480 store_signed_integer (buf, size, val);
3481 regcache_raw_write (inf_status->registers, regno, buf);
3484 /* Save all of the information associated with the inferior<==>gdb
3485 connection. INF_STATUS is a pointer to a "struct inferior_status"
3486 (defined in inferior.h). */
3488 struct inferior_status *
3489 save_inferior_status (int restore_stack_info)
3491 struct inferior_status *inf_status = XMALLOC (struct inferior_status);
3493 inf_status->stop_signal = stop_signal;
3494 inf_status->stop_pc = stop_pc;
3495 inf_status->stop_step = stop_step;
3496 inf_status->stop_stack_dummy = stop_stack_dummy;
3497 inf_status->stopped_by_random_signal = stopped_by_random_signal;
3498 inf_status->trap_expected = trap_expected;
3499 inf_status->step_range_start = step_range_start;
3500 inf_status->step_range_end = step_range_end;
3501 inf_status->step_frame_id = step_frame_id;
3502 inf_status->step_over_calls = step_over_calls;
3503 inf_status->stop_after_trap = stop_after_trap;
3504 inf_status->stop_soon = stop_soon;
3505 /* Save original bpstat chain here; replace it with copy of chain.
3506 If caller's caller is walking the chain, they'll be happier if we
3507 hand them back the original chain when restore_inferior_status is
3509 inf_status->stop_bpstat = stop_bpstat;
3510 stop_bpstat = bpstat_copy (stop_bpstat);
3511 inf_status->breakpoint_proceeded = breakpoint_proceeded;
3512 inf_status->restore_stack_info = restore_stack_info;
3513 inf_status->proceed_to_finish = proceed_to_finish;
3515 inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers);
3517 inf_status->registers = regcache_dup (current_regcache);
3519 inf_status->selected_frame_id = get_frame_id (deprecated_selected_frame);
3524 restore_selected_frame (void *args)
3526 struct frame_id *fid = (struct frame_id *) args;
3527 struct frame_info *frame;
3529 frame = frame_find_by_id (*fid);
3531 /* If inf_status->selected_frame_id is NULL, there was no previously
3535 warning ("Unable to restore previously selected frame.\n");
3539 select_frame (frame);
3545 restore_inferior_status (struct inferior_status *inf_status)
3547 stop_signal = inf_status->stop_signal;
3548 stop_pc = inf_status->stop_pc;
3549 stop_step = inf_status->stop_step;
3550 stop_stack_dummy = inf_status->stop_stack_dummy;
3551 stopped_by_random_signal = inf_status->stopped_by_random_signal;
3552 trap_expected = inf_status->trap_expected;
3553 step_range_start = inf_status->step_range_start;
3554 step_range_end = inf_status->step_range_end;
3555 step_frame_id = inf_status->step_frame_id;
3556 step_over_calls = inf_status->step_over_calls;
3557 stop_after_trap = inf_status->stop_after_trap;
3558 stop_soon = inf_status->stop_soon;
3559 bpstat_clear (&stop_bpstat);
3560 stop_bpstat = inf_status->stop_bpstat;
3561 breakpoint_proceeded = inf_status->breakpoint_proceeded;
3562 proceed_to_finish = inf_status->proceed_to_finish;
3564 /* FIXME: Is the restore of stop_registers always needed. */
3565 regcache_xfree (stop_registers);
3566 stop_registers = inf_status->stop_registers;
3568 /* The inferior can be gone if the user types "print exit(0)"
3569 (and perhaps other times). */
3570 if (target_has_execution)
3571 /* NB: The register write goes through to the target. */
3572 regcache_cpy (current_regcache, inf_status->registers);
3573 regcache_xfree (inf_status->registers);
3575 /* FIXME: If we are being called after stopping in a function which
3576 is called from gdb, we should not be trying to restore the
3577 selected frame; it just prints a spurious error message (The
3578 message is useful, however, in detecting bugs in gdb (like if gdb
3579 clobbers the stack)). In fact, should we be restoring the
3580 inferior status at all in that case? . */
3582 if (target_has_stack && inf_status->restore_stack_info)
3584 /* The point of catch_errors is that if the stack is clobbered,
3585 walking the stack might encounter a garbage pointer and
3586 error() trying to dereference it. */
3588 (restore_selected_frame, &inf_status->selected_frame_id,
3589 "Unable to restore previously selected frame:\n",
3590 RETURN_MASK_ERROR) == 0)
3591 /* Error in restoring the selected frame. Select the innermost
3593 select_frame (get_current_frame ());
3601 do_restore_inferior_status_cleanup (void *sts)
3603 restore_inferior_status (sts);
3607 make_cleanup_restore_inferior_status (struct inferior_status *inf_status)
3609 return make_cleanup (do_restore_inferior_status_cleanup, inf_status);
3613 discard_inferior_status (struct inferior_status *inf_status)
3615 /* See save_inferior_status for info on stop_bpstat. */
3616 bpstat_clear (&inf_status->stop_bpstat);
3617 regcache_xfree (inf_status->registers);
3618 regcache_xfree (inf_status->stop_registers);
3623 inferior_has_forked (int pid, int *child_pid)
3625 struct target_waitstatus last;
3628 get_last_target_status (&last_ptid, &last);
3630 if (last.kind != TARGET_WAITKIND_FORKED)
3633 if (ptid_get_pid (last_ptid) != pid)
3636 *child_pid = last.value.related_pid;
3641 inferior_has_vforked (int pid, int *child_pid)
3643 struct target_waitstatus last;
3646 get_last_target_status (&last_ptid, &last);
3648 if (last.kind != TARGET_WAITKIND_VFORKED)
3651 if (ptid_get_pid (last_ptid) != pid)
3654 *child_pid = last.value.related_pid;
3659 inferior_has_execd (int pid, char **execd_pathname)
3661 struct target_waitstatus last;
3664 get_last_target_status (&last_ptid, &last);
3666 if (last.kind != TARGET_WAITKIND_EXECD)
3669 if (ptid_get_pid (last_ptid) != pid)
3672 *execd_pathname = xstrdup (last.value.execd_pathname);
3676 /* Oft used ptids */
3678 ptid_t minus_one_ptid;
3680 /* Create a ptid given the necessary PID, LWP, and TID components. */
3683 ptid_build (int pid, long lwp, long tid)
3693 /* Create a ptid from just a pid. */
3696 pid_to_ptid (int pid)
3698 return ptid_build (pid, 0, 0);
3701 /* Fetch the pid (process id) component from a ptid. */
3704 ptid_get_pid (ptid_t ptid)
3709 /* Fetch the lwp (lightweight process) component from a ptid. */
3712 ptid_get_lwp (ptid_t ptid)
3717 /* Fetch the tid (thread id) component from a ptid. */
3720 ptid_get_tid (ptid_t ptid)
3725 /* ptid_equal() is used to test equality of two ptids. */
3728 ptid_equal (ptid_t ptid1, ptid_t ptid2)
3730 return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp
3731 && ptid1.tid == ptid2.tid);
3734 /* restore_inferior_ptid() will be used by the cleanup machinery
3735 to restore the inferior_ptid value saved in a call to
3736 save_inferior_ptid(). */
3739 restore_inferior_ptid (void *arg)
3741 ptid_t *saved_ptid_ptr = arg;
3742 inferior_ptid = *saved_ptid_ptr;
3746 /* Save the value of inferior_ptid so that it may be restored by a
3747 later call to do_cleanups(). Returns the struct cleanup pointer
3748 needed for later doing the cleanup. */
3751 save_inferior_ptid (void)
3753 ptid_t *saved_ptid_ptr;
3755 saved_ptid_ptr = xmalloc (sizeof (ptid_t));
3756 *saved_ptid_ptr = inferior_ptid;
3757 return make_cleanup (restore_inferior_ptid, saved_ptid_ptr);
3764 stop_registers = regcache_xmalloc (current_gdbarch);
3768 _initialize_infrun (void)
3772 struct cmd_list_element *c;
3774 DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers);
3775 deprecated_register_gdbarch_swap (NULL, 0, build_infrun);
3777 add_info ("signals", signals_info,
3778 "What debugger does when program gets various signals.\n\
3779 Specify a signal as argument to print info on that signal only.");
3780 add_info_alias ("handle", "signals", 0);
3782 add_com ("handle", class_run, handle_command,
3783 concat ("Specify how to handle a signal.\n\
3784 Args are signals and actions to apply to those signals.\n\
3785 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3786 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3787 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3788 The special arg \"all\" is recognized to mean all signals except those\n\
3789 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3790 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3791 Stop means reenter debugger if this signal happens (implies print).\n\
3792 Print means print a message if this signal happens.\n\
3793 Pass means let program see this signal; otherwise program doesn't know.\n\
3794 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3795 Pass and Stop may be combined.", NULL));
3798 add_com ("lz", class_info, signals_info,
3799 "What debugger does when program gets various signals.\n\
3800 Specify a signal as argument to print info on that signal only.");
3801 add_com ("z", class_run, xdb_handle_command,
3802 concat ("Specify how to handle a signal.\n\
3803 Args are signals and actions to apply to those signals.\n\
3804 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3805 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3806 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3807 The special arg \"all\" is recognized to mean all signals except those\n\
3808 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\
3809 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
3810 nopass), \"Q\" (noprint)\n\
3811 Stop means reenter debugger if this signal happens (implies print).\n\
3812 Print means print a message if this signal happens.\n\
3813 Pass means let program see this signal; otherwise program doesn't know.\n\
3814 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3815 Pass and Stop may be combined.", NULL));
3820 add_cmd ("stop", class_obscure, not_just_help_class_command, "There is no `stop' command, but you can set a hook on `stop'.\n\
3821 This allows you to set a list of commands to be run each time execution\n\
3822 of the program stops.", &cmdlist);
3824 numsigs = (int) TARGET_SIGNAL_LAST;
3825 signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs);
3826 signal_print = (unsigned char *)
3827 xmalloc (sizeof (signal_print[0]) * numsigs);
3828 signal_program = (unsigned char *)
3829 xmalloc (sizeof (signal_program[0]) * numsigs);
3830 for (i = 0; i < numsigs; i++)
3833 signal_print[i] = 1;
3834 signal_program[i] = 1;
3837 /* Signals caused by debugger's own actions
3838 should not be given to the program afterwards. */
3839 signal_program[TARGET_SIGNAL_TRAP] = 0;
3840 signal_program[TARGET_SIGNAL_INT] = 0;
3842 /* Signals that are not errors should not normally enter the debugger. */
3843 signal_stop[TARGET_SIGNAL_ALRM] = 0;
3844 signal_print[TARGET_SIGNAL_ALRM] = 0;
3845 signal_stop[TARGET_SIGNAL_VTALRM] = 0;
3846 signal_print[TARGET_SIGNAL_VTALRM] = 0;
3847 signal_stop[TARGET_SIGNAL_PROF] = 0;
3848 signal_print[TARGET_SIGNAL_PROF] = 0;
3849 signal_stop[TARGET_SIGNAL_CHLD] = 0;
3850 signal_print[TARGET_SIGNAL_CHLD] = 0;
3851 signal_stop[TARGET_SIGNAL_IO] = 0;
3852 signal_print[TARGET_SIGNAL_IO] = 0;
3853 signal_stop[TARGET_SIGNAL_POLL] = 0;
3854 signal_print[TARGET_SIGNAL_POLL] = 0;
3855 signal_stop[TARGET_SIGNAL_URG] = 0;
3856 signal_print[TARGET_SIGNAL_URG] = 0;
3857 signal_stop[TARGET_SIGNAL_WINCH] = 0;
3858 signal_print[TARGET_SIGNAL_WINCH] = 0;
3860 /* These signals are used internally by user-level thread
3861 implementations. (See signal(5) on Solaris.) Like the above
3862 signals, a healthy program receives and handles them as part of
3863 its normal operation. */
3864 signal_stop[TARGET_SIGNAL_LWP] = 0;
3865 signal_print[TARGET_SIGNAL_LWP] = 0;
3866 signal_stop[TARGET_SIGNAL_WAITING] = 0;
3867 signal_print[TARGET_SIGNAL_WAITING] = 0;
3868 signal_stop[TARGET_SIGNAL_CANCEL] = 0;
3869 signal_print[TARGET_SIGNAL_CANCEL] = 0;
3873 (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger,
3874 (char *) &stop_on_solib_events,
3875 "Set stopping for shared library events.\n\
3876 If nonzero, gdb will give control to the user when the dynamic linker\n\
3877 notifies gdb of shared library events. The most common event of interest\n\
3878 to the user would be loading/unloading of a new library.\n", &setlist), &showlist);
3881 c = add_set_enum_cmd ("follow-fork-mode",
3883 follow_fork_mode_kind_names, &follow_fork_mode_string,
3884 "Set debugger response to a program call of fork \
3886 A fork or vfork creates a new process. follow-fork-mode can be:\n\
3887 parent - the original process is debugged after a fork\n\
3888 child - the new process is debugged after a fork\n\
3889 The unfollowed process will continue to run.\n\
3890 By default, the debugger will follow the parent process.", &setlist);
3891 add_show_from_set (c, &showlist);
3893 c = add_set_enum_cmd ("scheduler-locking", class_run, scheduler_enums, /* array of string names */
3894 &scheduler_mode, /* current mode */
3895 "Set mode for locking scheduler during execution.\n\
3896 off == no locking (threads may preempt at any time)\n\
3897 on == full locking (no thread except the current thread may run)\n\
3898 step == scheduler locked during every single-step operation.\n\
3899 In this mode, no other thread may run during a step command.\n\
3900 Other threads may run while stepping over a function call ('next').", &setlist);
3902 set_cmd_sfunc (c, set_schedlock_func); /* traps on target vector */
3903 add_show_from_set (c, &showlist);
3905 c = add_set_cmd ("step-mode", class_run,
3906 var_boolean, (char *) &step_stop_if_no_debug,
3907 "Set mode of the step operation. When set, doing a step over a\n\
3908 function without debug line information will stop at the first\n\
3909 instruction of that function. Otherwise, the function is skipped and\n\
3910 the step command stops at a different source line.", &setlist);
3911 add_show_from_set (c, &showlist);
3913 /* ptid initializations */
3914 null_ptid = ptid_build (0, 0, 0);
3915 minus_one_ptid = ptid_build (-1, 0, 0);
3916 inferior_ptid = null_ptid;
3917 target_last_wait_ptid = minus_one_ptid;