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 Free Software
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"
48 /* Prototypes for local functions */
50 static void signals_info (char *, int);
52 static void handle_command (char *, int);
54 static void sig_print_info (enum target_signal);
56 static void sig_print_header (void);
58 static void resume_cleanups (void *);
60 static int hook_stop_stub (void *);
62 static void delete_breakpoint_current_contents (void *);
64 static void set_follow_fork_mode_command (char *arg, int from_tty,
65 struct cmd_list_element *c);
67 static int restore_selected_frame (void *);
69 static void build_infrun (void);
71 static int follow_fork (void);
73 static void set_schedlock_func (char *args, int from_tty,
74 struct cmd_list_element *c);
76 struct execution_control_state;
78 static int currently_stepping (struct execution_control_state *ecs);
80 static void xdb_handle_command (char *args, int from_tty);
82 void _initialize_infrun (void);
84 int inferior_ignoring_startup_exec_events = 0;
85 int inferior_ignoring_leading_exec_events = 0;
87 /* When set, stop the 'step' command if we enter a function which has
88 no line number information. The normal behavior is that we step
89 over such function. */
90 int step_stop_if_no_debug = 0;
92 /* In asynchronous mode, but simulating synchronous execution. */
94 int sync_execution = 0;
96 /* wait_for_inferior and normal_stop use this to notify the user
97 when the inferior stopped in a different thread than it had been
100 static ptid_t previous_inferior_ptid;
102 /* This is true for configurations that may follow through execl() and
103 similar functions. At present this is only true for HP-UX native. */
105 #ifndef MAY_FOLLOW_EXEC
106 #define MAY_FOLLOW_EXEC (0)
109 static int may_follow_exec = MAY_FOLLOW_EXEC;
111 /* If the program uses ELF-style shared libraries, then calls to
112 functions in shared libraries go through stubs, which live in a
113 table called the PLT (Procedure Linkage Table). The first time the
114 function is called, the stub sends control to the dynamic linker,
115 which looks up the function's real address, patches the stub so
116 that future calls will go directly to the function, and then passes
117 control to the function.
119 If we are stepping at the source level, we don't want to see any of
120 this --- we just want to skip over the stub and the dynamic linker.
121 The simple approach is to single-step until control leaves the
124 However, on some systems (e.g., Red Hat's 5.2 distribution) the
125 dynamic linker calls functions in the shared C library, so you
126 can't tell from the PC alone whether the dynamic linker is still
127 running. In this case, we use a step-resume breakpoint to get us
128 past the dynamic linker, as if we were using "next" to step over a
131 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
132 linker code or not. Normally, this means we single-step. However,
133 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
134 address where we can place a step-resume breakpoint to get past the
135 linker's symbol resolution function.
137 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
138 pretty portable way, by comparing the PC against the address ranges
139 of the dynamic linker's sections.
141 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
142 it depends on internal details of the dynamic linker. It's usually
143 not too hard to figure out where to put a breakpoint, but it
144 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
145 sanity checking. If it can't figure things out, returning zero and
146 getting the (possibly confusing) stepping behavior is better than
147 signalling an error, which will obscure the change in the
150 #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE
151 #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0
154 #ifndef SKIP_SOLIB_RESOLVER
155 #define SKIP_SOLIB_RESOLVER(pc) 0
158 /* This function returns TRUE if pc is the address of an instruction
159 that lies within the dynamic linker (such as the event hook, or the
162 This function must be used only when a dynamic linker event has
163 been caught, and the inferior is being stepped out of the hook, or
164 undefined results are guaranteed. */
166 #ifndef SOLIB_IN_DYNAMIC_LINKER
167 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
170 /* On MIPS16, a function that returns a floating point value may call
171 a library helper function to copy the return value to a floating point
172 register. The IGNORE_HELPER_CALL macro returns non-zero if we
173 should ignore (i.e. step over) this function call. */
174 #ifndef IGNORE_HELPER_CALL
175 #define IGNORE_HELPER_CALL(pc) 0
178 /* On some systems, the PC may be left pointing at an instruction that won't
179 actually be executed. This is usually indicated by a bit in the PSW. If
180 we find ourselves in such a state, then we step the target beyond the
181 nullified instruction before returning control to the user so as to avoid
184 #ifndef INSTRUCTION_NULLIFIED
185 #define INSTRUCTION_NULLIFIED 0
188 /* We can't step off a permanent breakpoint in the ordinary way, because we
189 can't remove it. Instead, we have to advance the PC to the next
190 instruction. This macro should expand to a pointer to a function that
191 does that, or zero if we have no such function. If we don't have a
192 definition for it, we have to report an error. */
193 #ifndef SKIP_PERMANENT_BREAKPOINT
194 #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint)
196 default_skip_permanent_breakpoint (void)
199 The program is stopped at a permanent breakpoint, but GDB does not know\n\
200 how to step past a permanent breakpoint on this architecture. Try using\n\
201 a command like `return' or `jump' to continue execution.");
206 /* Convert the #defines into values. This is temporary until wfi control
207 flow is completely sorted out. */
209 #ifndef HAVE_STEPPABLE_WATCHPOINT
210 #define HAVE_STEPPABLE_WATCHPOINT 0
212 #undef HAVE_STEPPABLE_WATCHPOINT
213 #define HAVE_STEPPABLE_WATCHPOINT 1
216 #ifndef CANNOT_STEP_HW_WATCHPOINTS
217 #define CANNOT_STEP_HW_WATCHPOINTS 0
219 #undef CANNOT_STEP_HW_WATCHPOINTS
220 #define CANNOT_STEP_HW_WATCHPOINTS 1
223 /* Tables of how to react to signals; the user sets them. */
225 static unsigned char *signal_stop;
226 static unsigned char *signal_print;
227 static unsigned char *signal_program;
229 #define SET_SIGS(nsigs,sigs,flags) \
231 int signum = (nsigs); \
232 while (signum-- > 0) \
233 if ((sigs)[signum]) \
234 (flags)[signum] = 1; \
237 #define UNSET_SIGS(nsigs,sigs,flags) \
239 int signum = (nsigs); \
240 while (signum-- > 0) \
241 if ((sigs)[signum]) \
242 (flags)[signum] = 0; \
245 /* Value to pass to target_resume() to cause all threads to resume */
247 #define RESUME_ALL (pid_to_ptid (-1))
249 /* Command list pointer for the "stop" placeholder. */
251 static struct cmd_list_element *stop_command;
253 /* Nonzero if breakpoints are now inserted in the inferior. */
255 static int breakpoints_inserted;
257 /* Function inferior was in as of last step command. */
259 static struct symbol *step_start_function;
261 /* Nonzero if we are expecting a trace trap and should proceed from it. */
263 static int trap_expected;
266 /* Nonzero if we want to give control to the user when we're notified
267 of shared library events by the dynamic linker. */
268 static int stop_on_solib_events;
272 /* Nonzero if the next time we try to continue the inferior, it will
273 step one instruction and generate a spurious trace trap.
274 This is used to compensate for a bug in HP-UX. */
276 static int trap_expected_after_continue;
279 /* Nonzero means expecting a trace trap
280 and should stop the inferior and return silently when it happens. */
284 /* Nonzero means expecting a trap and caller will handle it themselves.
285 It is used after attach, due to attaching to a process;
286 when running in the shell before the child program has been exec'd;
287 and when running some kinds of remote stuff (FIXME?). */
289 int stop_soon_quietly;
291 /* Nonzero if proceed is being used for a "finish" command or a similar
292 situation when stop_registers should be saved. */
294 int proceed_to_finish;
296 /* Save register contents here when about to pop a stack dummy frame,
297 if-and-only-if proceed_to_finish is set.
298 Thus this contains the return value from the called function (assuming
299 values are returned in a register). */
301 struct regcache *stop_registers;
303 /* Nonzero if program stopped due to error trying to insert breakpoints. */
305 static int breakpoints_failed;
307 /* Nonzero after stop if current stack frame should be printed. */
309 static int stop_print_frame;
311 static struct breakpoint *step_resume_breakpoint = NULL;
312 static struct breakpoint *through_sigtramp_breakpoint = NULL;
314 /* On some platforms (e.g., HP-UX), hardware watchpoints have bad
315 interactions with an inferior that is running a kernel function
316 (aka, a system call or "syscall"). wait_for_inferior therefore
317 may have a need to know when the inferior is in a syscall. This
318 is a count of the number of inferior threads which are known to
319 currently be running in a syscall. */
320 static int number_of_threads_in_syscalls;
322 /* This is a cached copy of the pid/waitstatus of the last event
323 returned by target_wait()/target_wait_hook(). This information is
324 returned by get_last_target_status(). */
325 static ptid_t target_last_wait_ptid;
326 static struct target_waitstatus target_last_waitstatus;
328 /* This is used to remember when a fork, vfork or exec event
329 was caught by a catchpoint, and thus the event is to be
330 followed at the next resume of the inferior, and not
334 enum target_waitkind kind;
341 char *execd_pathname;
345 static const char follow_fork_mode_ask[] = "ask";
346 static const char follow_fork_mode_child[] = "child";
347 static const char follow_fork_mode_parent[] = "parent";
349 static const char *follow_fork_mode_kind_names[] = {
350 follow_fork_mode_ask,
351 follow_fork_mode_child,
352 follow_fork_mode_parent,
356 static const char *follow_fork_mode_string = follow_fork_mode_parent;
362 const char *follow_mode = follow_fork_mode_string;
363 int follow_child = (follow_mode == follow_fork_mode_child);
365 /* Or, did the user not know, and want us to ask? */
366 if (follow_fork_mode_string == follow_fork_mode_ask)
368 internal_error (__FILE__, __LINE__,
369 "follow_inferior_fork: \"ask\" mode not implemented");
370 /* follow_mode = follow_fork_mode_...; */
373 return target_follow_fork (follow_child);
377 follow_inferior_reset_breakpoints (void)
379 /* Was there a step_resume breakpoint? (There was if the user
380 did a "next" at the fork() call.) If so, explicitly reset its
383 step_resumes are a form of bp that are made to be per-thread.
384 Since we created the step_resume bp when the parent process
385 was being debugged, and now are switching to the child process,
386 from the breakpoint package's viewpoint, that's a switch of
387 "threads". We must update the bp's notion of which thread
388 it is for, or it'll be ignored when it triggers. */
390 if (step_resume_breakpoint)
391 breakpoint_re_set_thread (step_resume_breakpoint);
393 /* Reinsert all breakpoints in the child. The user may have set
394 breakpoints after catching the fork, in which case those
395 were never set in the child, but only in the parent. This makes
396 sure the inserted breakpoints match the breakpoint list. */
398 breakpoint_re_set ();
399 insert_breakpoints ();
402 /* EXECD_PATHNAME is assumed to be non-NULL. */
405 follow_exec (int pid, char *execd_pathname)
408 struct target_ops *tgt;
410 if (!may_follow_exec)
413 /* This is an exec event that we actually wish to pay attention to.
414 Refresh our symbol table to the newly exec'd program, remove any
417 If there are breakpoints, they aren't really inserted now,
418 since the exec() transformed our inferior into a fresh set
421 We want to preserve symbolic breakpoints on the list, since
422 we have hopes that they can be reset after the new a.out's
423 symbol table is read.
425 However, any "raw" breakpoints must be removed from the list
426 (e.g., the solib bp's), since their address is probably invalid
429 And, we DON'T want to call delete_breakpoints() here, since
430 that may write the bp's "shadow contents" (the instruction
431 value that was overwritten witha TRAP instruction). Since
432 we now have a new a.out, those shadow contents aren't valid. */
433 update_breakpoints_after_exec ();
435 /* If there was one, it's gone now. We cannot truly step-to-next
436 statement through an exec(). */
437 step_resume_breakpoint = NULL;
438 step_range_start = 0;
441 /* If there was one, it's gone now. */
442 through_sigtramp_breakpoint = NULL;
444 /* What is this a.out's name? */
445 printf_unfiltered ("Executing new program: %s\n", execd_pathname);
447 /* We've followed the inferior through an exec. Therefore, the
448 inferior has essentially been killed & reborn. */
450 /* First collect the run target in effect. */
451 tgt = find_run_target ();
452 /* If we can't find one, things are in a very strange state... */
454 error ("Could find run target to save before following exec");
456 gdb_flush (gdb_stdout);
457 target_mourn_inferior ();
458 inferior_ptid = pid_to_ptid (saved_pid);
459 /* Because mourn_inferior resets inferior_ptid. */
462 /* That a.out is now the one to use. */
463 exec_file_attach (execd_pathname, 0);
465 /* And also is where symbols can be found. */
466 symbol_file_add_main (execd_pathname, 0);
468 /* Reset the shared library package. This ensures that we get
469 a shlib event when the child reaches "_start", at which point
470 the dld will have had a chance to initialize the child. */
471 #if defined(SOLIB_RESTART)
474 #ifdef SOLIB_CREATE_INFERIOR_HOOK
475 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid));
478 /* Reinsert all breakpoints. (Those which were symbolic have
479 been reset to the proper address in the new a.out, thanks
480 to symbol_file_command...) */
481 insert_breakpoints ();
483 /* The next resume of this inferior should bring it to the shlib
484 startup breakpoints. (If the user had also set bp's on
485 "main" from the old (parent) process, then they'll auto-
486 matically get reset there in the new process.) */
489 /* Non-zero if we just simulating a single-step. This is needed
490 because we cannot remove the breakpoints in the inferior process
491 until after the `wait' in `wait_for_inferior'. */
492 static int singlestep_breakpoints_inserted_p = 0;
495 /* Things to clean up if we QUIT out of resume (). */
498 resume_cleanups (void *ignore)
503 static const char schedlock_off[] = "off";
504 static const char schedlock_on[] = "on";
505 static const char schedlock_step[] = "step";
506 static const char *scheduler_mode = schedlock_off;
507 static const char *scheduler_enums[] = {
515 set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c)
517 /* NOTE: cagney/2002-03-17: The add_show_from_set() function clones
518 the set command passed as a parameter. The clone operation will
519 include (BUG?) any ``set'' command callback, if present.
520 Commands like ``info set'' call all the ``show'' command
521 callbacks. Unfortunatly, for ``show'' commands cloned from
522 ``set'', this includes callbacks belonging to ``set'' commands.
523 Making this worse, this only occures if add_show_from_set() is
524 called after add_cmd_sfunc() (BUG?). */
525 if (cmd_type (c) == set_cmd)
526 if (!target_can_lock_scheduler)
528 scheduler_mode = schedlock_off;
529 error ("Target '%s' cannot support this command.", target_shortname);
534 /* Resume the inferior, but allow a QUIT. This is useful if the user
535 wants to interrupt some lengthy single-stepping operation
536 (for child processes, the SIGINT goes to the inferior, and so
537 we get a SIGINT random_signal, but for remote debugging and perhaps
538 other targets, that's not true).
540 STEP nonzero if we should step (zero to continue instead).
541 SIG is the signal to give the inferior (zero for none). */
543 resume (int step, enum target_signal sig)
545 int should_resume = 1;
546 struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0);
549 /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */
552 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
553 over an instruction that causes a page fault without triggering
554 a hardware watchpoint. The kernel properly notices that it shouldn't
555 stop, because the hardware watchpoint is not triggered, but it forgets
556 the step request and continues the program normally.
557 Work around the problem by removing hardware watchpoints if a step is
558 requested, GDB will check for a hardware watchpoint trigger after the
560 if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted)
561 remove_hw_watchpoints ();
564 /* Normally, by the time we reach `resume', the breakpoints are either
565 removed or inserted, as appropriate. The exception is if we're sitting
566 at a permanent breakpoint; we need to step over it, but permanent
567 breakpoints can't be removed. So we have to test for it here. */
568 if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here)
569 SKIP_PERMANENT_BREAKPOINT ();
571 if (SOFTWARE_SINGLE_STEP_P () && step)
573 /* Do it the hard way, w/temp breakpoints */
574 SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ );
575 /* ...and don't ask hardware to do it. */
577 /* and do not pull these breakpoints until after a `wait' in
578 `wait_for_inferior' */
579 singlestep_breakpoints_inserted_p = 1;
582 /* Handle any optimized stores to the inferior NOW... */
583 #ifdef DO_DEFERRED_STORES
587 /* If there were any forks/vforks/execs that were caught and are
588 now to be followed, then do so. */
589 switch (pending_follow.kind)
591 case TARGET_WAITKIND_FORKED:
592 case TARGET_WAITKIND_VFORKED:
593 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
598 case TARGET_WAITKIND_EXECD:
599 /* follow_exec is called as soon as the exec event is seen. */
600 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
607 /* Install inferior's terminal modes. */
608 target_terminal_inferior ();
614 resume_ptid = RESUME_ALL; /* Default */
616 if ((step || singlestep_breakpoints_inserted_p) &&
617 !breakpoints_inserted && breakpoint_here_p (read_pc ()))
619 /* Stepping past a breakpoint without inserting breakpoints.
620 Make sure only the current thread gets to step, so that
621 other threads don't sneak past breakpoints while they are
624 resume_ptid = inferior_ptid;
627 if ((scheduler_mode == schedlock_on) ||
628 (scheduler_mode == schedlock_step &&
629 (step || singlestep_breakpoints_inserted_p)))
631 /* User-settable 'scheduler' mode requires solo thread resume. */
632 resume_ptid = inferior_ptid;
635 if (CANNOT_STEP_BREAKPOINT)
637 /* Most targets can step a breakpoint instruction, thus
638 executing it normally. But if this one cannot, just
639 continue and we will hit it anyway. */
640 if (step && breakpoints_inserted && breakpoint_here_p (read_pc ()))
643 target_resume (resume_ptid, step, sig);
646 discard_cleanups (old_cleanups);
650 /* Clear out all variables saying what to do when inferior is continued.
651 First do this, then set the ones you want, then call `proceed'. */
654 clear_proceed_status (void)
657 step_range_start = 0;
659 step_frame_id = null_frame_id;
660 step_over_calls = STEP_OVER_UNDEBUGGABLE;
662 stop_soon_quietly = 0;
663 proceed_to_finish = 0;
664 breakpoint_proceeded = 1; /* We're about to proceed... */
666 /* Discard any remaining commands or status from previous stop. */
667 bpstat_clear (&stop_bpstat);
670 /* Basic routine for continuing the program in various fashions.
672 ADDR is the address to resume at, or -1 for resume where stopped.
673 SIGGNAL is the signal to give it, or 0 for none,
674 or -1 for act according to how it stopped.
675 STEP is nonzero if should trap after one instruction.
676 -1 means return after that and print nothing.
677 You should probably set various step_... variables
678 before calling here, if you are stepping.
680 You should call clear_proceed_status before calling proceed. */
683 proceed (CORE_ADDR addr, enum target_signal siggnal, int step)
688 step_start_function = find_pc_function (read_pc ());
692 if (addr == (CORE_ADDR) -1)
694 /* If there is a breakpoint at the address we will resume at,
695 step one instruction before inserting breakpoints
696 so that we do not stop right away (and report a second
697 hit at this breakpoint). */
699 if (read_pc () == stop_pc && breakpoint_here_p (read_pc ()))
702 #ifndef STEP_SKIPS_DELAY
703 #define STEP_SKIPS_DELAY(pc) (0)
704 #define STEP_SKIPS_DELAY_P (0)
706 /* Check breakpoint_here_p first, because breakpoint_here_p is fast
707 (it just checks internal GDB data structures) and STEP_SKIPS_DELAY
708 is slow (it needs to read memory from the target). */
709 if (STEP_SKIPS_DELAY_P
710 && breakpoint_here_p (read_pc () + 4)
711 && STEP_SKIPS_DELAY (read_pc ()))
719 #ifdef PREPARE_TO_PROCEED
720 /* In a multi-threaded task we may select another thread
721 and then continue or step.
723 But if the old thread was stopped at a breakpoint, it
724 will immediately cause another breakpoint stop without
725 any execution (i.e. it will report a breakpoint hit
726 incorrectly). So we must step over it first.
728 PREPARE_TO_PROCEED checks the current thread against the thread
729 that reported the most recent event. If a step-over is required
730 it returns TRUE and sets the current thread to the old thread. */
731 if (PREPARE_TO_PROCEED (1) && breakpoint_here_p (read_pc ()))
736 #endif /* PREPARE_TO_PROCEED */
739 if (trap_expected_after_continue)
741 /* If (step == 0), a trap will be automatically generated after
742 the first instruction is executed. Force step one
743 instruction to clear this condition. This should not occur
744 if step is nonzero, but it is harmless in that case. */
746 trap_expected_after_continue = 0;
748 #endif /* HP_OS_BUG */
751 /* We will get a trace trap after one instruction.
752 Continue it automatically and insert breakpoints then. */
756 insert_breakpoints ();
757 /* If we get here there was no call to error() in
758 insert breakpoints -- so they were inserted. */
759 breakpoints_inserted = 1;
762 if (siggnal != TARGET_SIGNAL_DEFAULT)
763 stop_signal = siggnal;
764 /* If this signal should not be seen by program,
765 give it zero. Used for debugging signals. */
766 else if (!signal_program[stop_signal])
767 stop_signal = TARGET_SIGNAL_0;
769 annotate_starting ();
771 /* Make sure that output from GDB appears before output from the
773 gdb_flush (gdb_stdout);
775 /* Resume inferior. */
776 resume (oneproc || step || bpstat_should_step (), stop_signal);
778 /* Wait for it to stop (if not standalone)
779 and in any case decode why it stopped, and act accordingly. */
780 /* Do this only if we are not using the event loop, or if the target
781 does not support asynchronous execution. */
782 if (!event_loop_p || !target_can_async_p ())
784 wait_for_inferior ();
789 /* Record the pc and sp of the program the last time it stopped.
790 These are just used internally by wait_for_inferior, but need
791 to be preserved over calls to it and cleared when the inferior
793 static CORE_ADDR prev_pc;
794 static CORE_ADDR prev_func_start;
795 static char *prev_func_name;
798 /* Start remote-debugging of a machine over a serial link. */
804 init_wait_for_inferior ();
805 stop_soon_quietly = 1;
808 /* Always go on waiting for the target, regardless of the mode. */
809 /* FIXME: cagney/1999-09-23: At present it isn't possible to
810 indicate to wait_for_inferior that a target should timeout if
811 nothing is returned (instead of just blocking). Because of this,
812 targets expecting an immediate response need to, internally, set
813 things up so that the target_wait() is forced to eventually
815 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
816 differentiate to its caller what the state of the target is after
817 the initial open has been performed. Here we're assuming that
818 the target has stopped. It should be possible to eventually have
819 target_open() return to the caller an indication that the target
820 is currently running and GDB state should be set to the same as
822 wait_for_inferior ();
826 /* Initialize static vars when a new inferior begins. */
829 init_wait_for_inferior (void)
831 /* These are meaningless until the first time through wait_for_inferior. */
834 prev_func_name = NULL;
837 trap_expected_after_continue = 0;
839 breakpoints_inserted = 0;
840 breakpoint_init_inferior (inf_starting);
842 /* Don't confuse first call to proceed(). */
843 stop_signal = TARGET_SIGNAL_0;
845 /* The first resume is not following a fork/vfork/exec. */
846 pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */
848 /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */
849 number_of_threads_in_syscalls = 0;
851 clear_proceed_status ();
855 delete_breakpoint_current_contents (void *arg)
857 struct breakpoint **breakpointp = (struct breakpoint **) arg;
858 if (*breakpointp != NULL)
860 delete_breakpoint (*breakpointp);
865 /* This enum encodes possible reasons for doing a target_wait, so that
866 wfi can call target_wait in one place. (Ultimately the call will be
867 moved out of the infinite loop entirely.) */
871 infwait_normal_state,
872 infwait_thread_hop_state,
873 infwait_nullified_state,
874 infwait_nonstep_watch_state
877 /* Why did the inferior stop? Used to print the appropriate messages
878 to the interface from within handle_inferior_event(). */
879 enum inferior_stop_reason
881 /* We don't know why. */
883 /* Step, next, nexti, stepi finished. */
885 /* Found breakpoint. */
887 /* Inferior terminated by signal. */
889 /* Inferior exited. */
891 /* Inferior received signal, and user asked to be notified. */
895 /* This structure contains what used to be local variables in
896 wait_for_inferior. Probably many of them can return to being
897 locals in handle_inferior_event. */
899 struct execution_control_state
901 struct target_waitstatus ws;
902 struct target_waitstatus *wp;
905 CORE_ADDR stop_func_start;
906 CORE_ADDR stop_func_end;
907 char *stop_func_name;
908 struct symtab_and_line sal;
909 int remove_breakpoints_on_following_step;
911 struct symtab *current_symtab;
912 int handling_longjmp; /* FIXME */
914 ptid_t saved_inferior_ptid;
916 int stepping_through_solib_after_catch;
917 bpstat stepping_through_solib_catchpoints;
918 int enable_hw_watchpoints_after_wait;
919 int stepping_through_sigtramp;
920 int new_thread_event;
921 struct target_waitstatus tmpstatus;
922 enum infwait_states infwait_state;
927 void init_execution_control_state (struct execution_control_state *ecs);
929 void handle_inferior_event (struct execution_control_state *ecs);
931 static void check_sigtramp2 (struct execution_control_state *ecs);
932 static void step_into_function (struct execution_control_state *ecs);
933 static void step_over_function (struct execution_control_state *ecs);
934 static void stop_stepping (struct execution_control_state *ecs);
935 static void prepare_to_wait (struct execution_control_state *ecs);
936 static void keep_going (struct execution_control_state *ecs);
937 static void print_stop_reason (enum inferior_stop_reason stop_reason,
940 /* Wait for control to return from inferior to debugger.
941 If inferior gets a signal, we may decide to start it up again
942 instead of returning. That is why there is a loop in this function.
943 When this function actually returns it means the inferior
944 should be left stopped and GDB should read more commands. */
947 wait_for_inferior (void)
949 struct cleanup *old_cleanups;
950 struct execution_control_state ecss;
951 struct execution_control_state *ecs;
953 old_cleanups = make_cleanup (delete_step_resume_breakpoint,
954 &step_resume_breakpoint);
955 make_cleanup (delete_breakpoint_current_contents,
956 &through_sigtramp_breakpoint);
958 /* wfi still stays in a loop, so it's OK just to take the address of
959 a local to get the ecs pointer. */
962 /* Fill in with reasonable starting values. */
963 init_execution_control_state (ecs);
965 /* We'll update this if & when we switch to a new thread. */
966 previous_inferior_ptid = inferior_ptid;
968 overlay_cache_invalid = 1;
970 /* We have to invalidate the registers BEFORE calling target_wait
971 because they can be loaded from the target while in target_wait.
972 This makes remote debugging a bit more efficient for those
973 targets that provide critical registers as part of their normal
976 registers_changed ();
980 if (target_wait_hook)
981 ecs->ptid = target_wait_hook (ecs->waiton_ptid, ecs->wp);
983 ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp);
985 /* Now figure out what to do with the result of the result. */
986 handle_inferior_event (ecs);
988 if (!ecs->wait_some_more)
991 do_cleanups (old_cleanups);
994 /* Asynchronous version of wait_for_inferior. It is called by the
995 event loop whenever a change of state is detected on the file
996 descriptor corresponding to the target. It can be called more than
997 once to complete a single execution command. In such cases we need
998 to keep the state in a global variable ASYNC_ECSS. If it is the
999 last time that this function is called for a single execution
1000 command, then report to the user that the inferior has stopped, and
1001 do the necessary cleanups. */
1003 struct execution_control_state async_ecss;
1004 struct execution_control_state *async_ecs;
1007 fetch_inferior_event (void *client_data)
1009 static struct cleanup *old_cleanups;
1011 async_ecs = &async_ecss;
1013 if (!async_ecs->wait_some_more)
1015 old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint,
1016 &step_resume_breakpoint);
1017 make_exec_cleanup (delete_breakpoint_current_contents,
1018 &through_sigtramp_breakpoint);
1020 /* Fill in with reasonable starting values. */
1021 init_execution_control_state (async_ecs);
1023 /* We'll update this if & when we switch to a new thread. */
1024 previous_inferior_ptid = inferior_ptid;
1026 overlay_cache_invalid = 1;
1028 /* We have to invalidate the registers BEFORE calling target_wait
1029 because they can be loaded from the target while in target_wait.
1030 This makes remote debugging a bit more efficient for those
1031 targets that provide critical registers as part of their normal
1032 status mechanism. */
1034 registers_changed ();
1037 if (target_wait_hook)
1039 target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp);
1041 async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp);
1043 /* Now figure out what to do with the result of the result. */
1044 handle_inferior_event (async_ecs);
1046 if (!async_ecs->wait_some_more)
1048 /* Do only the cleanups that have been added by this
1049 function. Let the continuations for the commands do the rest,
1050 if there are any. */
1051 do_exec_cleanups (old_cleanups);
1053 if (step_multi && stop_step)
1054 inferior_event_handler (INF_EXEC_CONTINUE, NULL);
1056 inferior_event_handler (INF_EXEC_COMPLETE, NULL);
1060 /* Prepare an execution control state for looping through a
1061 wait_for_inferior-type loop. */
1064 init_execution_control_state (struct execution_control_state *ecs)
1066 /* ecs->another_trap? */
1067 ecs->random_signal = 0;
1068 ecs->remove_breakpoints_on_following_step = 0;
1069 ecs->handling_longjmp = 0; /* FIXME */
1070 ecs->update_step_sp = 0;
1071 ecs->stepping_through_solib_after_catch = 0;
1072 ecs->stepping_through_solib_catchpoints = NULL;
1073 ecs->enable_hw_watchpoints_after_wait = 0;
1074 ecs->stepping_through_sigtramp = 0;
1075 ecs->sal = find_pc_line (prev_pc, 0);
1076 ecs->current_line = ecs->sal.line;
1077 ecs->current_symtab = ecs->sal.symtab;
1078 ecs->infwait_state = infwait_normal_state;
1079 ecs->waiton_ptid = pid_to_ptid (-1);
1080 ecs->wp = &(ecs->ws);
1083 /* Call this function before setting step_resume_breakpoint, as a
1084 sanity check. There should never be more than one step-resume
1085 breakpoint per thread, so we should never be setting a new
1086 step_resume_breakpoint when one is already active. */
1088 check_for_old_step_resume_breakpoint (void)
1090 if (step_resume_breakpoint)
1092 ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint");
1095 /* Return the cached copy of the last pid/waitstatus returned by
1096 target_wait()/target_wait_hook(). The data is actually cached by
1097 handle_inferior_event(), which gets called immediately after
1098 target_wait()/target_wait_hook(). */
1101 get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status)
1103 *ptidp = target_last_wait_ptid;
1104 *status = target_last_waitstatus;
1107 /* Switch thread contexts, maintaining "infrun state". */
1110 context_switch (struct execution_control_state *ecs)
1112 /* Caution: it may happen that the new thread (or the old one!)
1113 is not in the thread list. In this case we must not attempt
1114 to "switch context", or we run the risk that our context may
1115 be lost. This may happen as a result of the target module
1116 mishandling thread creation. */
1118 if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid))
1119 { /* Perform infrun state context switch: */
1120 /* Save infrun state for the old thread. */
1121 save_infrun_state (inferior_ptid, prev_pc,
1122 prev_func_start, prev_func_name,
1123 trap_expected, step_resume_breakpoint,
1124 through_sigtramp_breakpoint, step_range_start,
1125 step_range_end, &step_frame_id,
1126 ecs->handling_longjmp, ecs->another_trap,
1127 ecs->stepping_through_solib_after_catch,
1128 ecs->stepping_through_solib_catchpoints,
1129 ecs->stepping_through_sigtramp,
1130 ecs->current_line, ecs->current_symtab, step_sp);
1132 /* Load infrun state for the new thread. */
1133 load_infrun_state (ecs->ptid, &prev_pc,
1134 &prev_func_start, &prev_func_name,
1135 &trap_expected, &step_resume_breakpoint,
1136 &through_sigtramp_breakpoint, &step_range_start,
1137 &step_range_end, &step_frame_id,
1138 &ecs->handling_longjmp, &ecs->another_trap,
1139 &ecs->stepping_through_solib_after_catch,
1140 &ecs->stepping_through_solib_catchpoints,
1141 &ecs->stepping_through_sigtramp,
1142 &ecs->current_line, &ecs->current_symtab, &step_sp);
1144 inferior_ptid = ecs->ptid;
1148 /* Given an execution control state that has been freshly filled in
1149 by an event from the inferior, figure out what it means and take
1150 appropriate action. */
1153 handle_inferior_event (struct execution_control_state *ecs)
1155 CORE_ADDR real_stop_pc;
1156 /* NOTE: cagney/2003-03-28: If you're looking at this code and
1157 thinking that the variable stepped_after_stopped_by_watchpoint
1158 isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT,
1159 defined in the file "config/pa/nm-hppah.h", accesses the variable
1160 indirectly. Mutter something rude about the HP merge. */
1161 int stepped_after_stopped_by_watchpoint;
1162 int sw_single_step_trap_p = 0;
1164 /* Cache the last pid/waitstatus. */
1165 target_last_wait_ptid = ecs->ptid;
1166 target_last_waitstatus = *ecs->wp;
1168 switch (ecs->infwait_state)
1170 case infwait_thread_hop_state:
1171 /* Cancel the waiton_ptid. */
1172 ecs->waiton_ptid = pid_to_ptid (-1);
1173 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1174 is serviced in this loop, below. */
1175 if (ecs->enable_hw_watchpoints_after_wait)
1177 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid));
1178 ecs->enable_hw_watchpoints_after_wait = 0;
1180 stepped_after_stopped_by_watchpoint = 0;
1183 case infwait_normal_state:
1184 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1185 is serviced in this loop, below. */
1186 if (ecs->enable_hw_watchpoints_after_wait)
1188 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid));
1189 ecs->enable_hw_watchpoints_after_wait = 0;
1191 stepped_after_stopped_by_watchpoint = 0;
1194 case infwait_nullified_state:
1195 stepped_after_stopped_by_watchpoint = 0;
1198 case infwait_nonstep_watch_state:
1199 insert_breakpoints ();
1201 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1202 handle things like signals arriving and other things happening
1203 in combination correctly? */
1204 stepped_after_stopped_by_watchpoint = 1;
1208 internal_error (__FILE__, __LINE__, "bad switch");
1210 ecs->infwait_state = infwait_normal_state;
1212 flush_cached_frames ();
1214 /* If it's a new process, add it to the thread database */
1216 ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid)
1217 && !in_thread_list (ecs->ptid));
1219 if (ecs->ws.kind != TARGET_WAITKIND_EXITED
1220 && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event)
1222 add_thread (ecs->ptid);
1224 ui_out_text (uiout, "[New ");
1225 ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid));
1226 ui_out_text (uiout, "]\n");
1229 /* NOTE: This block is ONLY meant to be invoked in case of a
1230 "thread creation event"! If it is invoked for any other
1231 sort of event (such as a new thread landing on a breakpoint),
1232 the event will be discarded, which is almost certainly
1235 To avoid this, the low-level module (eg. target_wait)
1236 should call in_thread_list and add_thread, so that the
1237 new thread is known by the time we get here. */
1239 /* We may want to consider not doing a resume here in order
1240 to give the user a chance to play with the new thread.
1241 It might be good to make that a user-settable option. */
1243 /* At this point, all threads are stopped (happens
1244 automatically in either the OS or the native code).
1245 Therefore we need to continue all threads in order to
1248 target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0);
1249 prepare_to_wait (ecs);
1254 switch (ecs->ws.kind)
1256 case TARGET_WAITKIND_LOADED:
1257 /* Ignore gracefully during startup of the inferior, as it
1258 might be the shell which has just loaded some objects,
1259 otherwise add the symbols for the newly loaded objects. */
1261 if (!stop_soon_quietly)
1263 /* Remove breakpoints, SOLIB_ADD might adjust
1264 breakpoint addresses via breakpoint_re_set. */
1265 if (breakpoints_inserted)
1266 remove_breakpoints ();
1268 /* Check for any newly added shared libraries if we're
1269 supposed to be adding them automatically. Switch
1270 terminal for any messages produced by
1271 breakpoint_re_set. */
1272 target_terminal_ours_for_output ();
1273 SOLIB_ADD (NULL, 0, NULL, auto_solib_add);
1274 target_terminal_inferior ();
1276 /* Reinsert breakpoints and continue. */
1277 if (breakpoints_inserted)
1278 insert_breakpoints ();
1281 resume (0, TARGET_SIGNAL_0);
1282 prepare_to_wait (ecs);
1285 case TARGET_WAITKIND_SPURIOUS:
1286 resume (0, TARGET_SIGNAL_0);
1287 prepare_to_wait (ecs);
1290 case TARGET_WAITKIND_EXITED:
1291 target_terminal_ours (); /* Must do this before mourn anyway */
1292 print_stop_reason (EXITED, ecs->ws.value.integer);
1294 /* Record the exit code in the convenience variable $_exitcode, so
1295 that the user can inspect this again later. */
1296 set_internalvar (lookup_internalvar ("_exitcode"),
1297 value_from_longest (builtin_type_int,
1298 (LONGEST) ecs->ws.value.integer));
1299 gdb_flush (gdb_stdout);
1300 target_mourn_inferior ();
1301 singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */
1302 stop_print_frame = 0;
1303 stop_stepping (ecs);
1306 case TARGET_WAITKIND_SIGNALLED:
1307 stop_print_frame = 0;
1308 stop_signal = ecs->ws.value.sig;
1309 target_terminal_ours (); /* Must do this before mourn anyway */
1311 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1312 reach here unless the inferior is dead. However, for years
1313 target_kill() was called here, which hints that fatal signals aren't
1314 really fatal on some systems. If that's true, then some changes
1316 target_mourn_inferior ();
1318 print_stop_reason (SIGNAL_EXITED, stop_signal);
1319 singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */
1320 stop_stepping (ecs);
1323 /* The following are the only cases in which we keep going;
1324 the above cases end in a continue or goto. */
1325 case TARGET_WAITKIND_FORKED:
1326 case TARGET_WAITKIND_VFORKED:
1327 stop_signal = TARGET_SIGNAL_TRAP;
1328 pending_follow.kind = ecs->ws.kind;
1330 pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid);
1331 pending_follow.fork_event.child_pid = ecs->ws.value.related_pid;
1333 stop_pc = read_pc ();
1335 /* Assume that catchpoints are not really software breakpoints. If
1336 some future target implements them using software breakpoints then
1337 that target is responsible for fudging DECR_PC_AFTER_BREAK. Thus
1338 we pass 1 for the NOT_A_SW_BREAKPOINT argument, so that
1339 bpstat_stop_status will not decrement the PC. */
1341 stop_bpstat = bpstat_stop_status (&stop_pc, 1);
1343 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1345 /* If no catchpoint triggered for this, then keep going. */
1346 if (ecs->random_signal)
1348 stop_signal = TARGET_SIGNAL_0;
1352 goto process_event_stop_test;
1354 case TARGET_WAITKIND_EXECD:
1355 stop_signal = TARGET_SIGNAL_TRAP;
1357 /* NOTE drow/2002-12-05: This code should be pushed down into the
1358 target_wait function. Until then following vfork on HP/UX 10.20
1359 is probably broken by this. Of course, it's broken anyway. */
1360 /* Is this a target which reports multiple exec events per actual
1361 call to exec()? (HP-UX using ptrace does, for example.) If so,
1362 ignore all but the last one. Just resume the exec'r, and wait
1363 for the next exec event. */
1364 if (inferior_ignoring_leading_exec_events)
1366 inferior_ignoring_leading_exec_events--;
1367 if (pending_follow.kind == TARGET_WAITKIND_VFORKED)
1368 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event.
1370 target_resume (ecs->ptid, 0, TARGET_SIGNAL_0);
1371 prepare_to_wait (ecs);
1374 inferior_ignoring_leading_exec_events =
1375 target_reported_exec_events_per_exec_call () - 1;
1377 pending_follow.execd_pathname =
1378 savestring (ecs->ws.value.execd_pathname,
1379 strlen (ecs->ws.value.execd_pathname));
1381 /* This causes the eventpoints and symbol table to be reset. Must
1382 do this now, before trying to determine whether to stop. */
1383 follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname);
1384 xfree (pending_follow.execd_pathname);
1386 stop_pc = read_pc_pid (ecs->ptid);
1387 ecs->saved_inferior_ptid = inferior_ptid;
1388 inferior_ptid = ecs->ptid;
1390 /* Assume that catchpoints are not really software breakpoints. If
1391 some future target implements them using software breakpoints then
1392 that target is responsible for fudging DECR_PC_AFTER_BREAK. Thus
1393 we pass 1 for the NOT_A_SW_BREAKPOINT argument, so that
1394 bpstat_stop_status will not decrement the PC. */
1396 stop_bpstat = bpstat_stop_status (&stop_pc, 1);
1398 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1399 inferior_ptid = ecs->saved_inferior_ptid;
1401 /* If no catchpoint triggered for this, then keep going. */
1402 if (ecs->random_signal)
1404 stop_signal = TARGET_SIGNAL_0;
1408 goto process_event_stop_test;
1410 /* These syscall events are returned on HP-UX, as part of its
1411 implementation of page-protection-based "hardware" watchpoints.
1412 HP-UX has unfortunate interactions between page-protections and
1413 some system calls. Our solution is to disable hardware watches
1414 when a system call is entered, and reenable them when the syscall
1415 completes. The downside of this is that we may miss the precise
1416 point at which a watched piece of memory is modified. "Oh well."
1418 Note that we may have multiple threads running, which may each
1419 enter syscalls at roughly the same time. Since we don't have a
1420 good notion currently of whether a watched piece of memory is
1421 thread-private, we'd best not have any page-protections active
1422 when any thread is in a syscall. Thus, we only want to reenable
1423 hardware watches when no threads are in a syscall.
1425 Also, be careful not to try to gather much state about a thread
1426 that's in a syscall. It's frequently a losing proposition. */
1427 case TARGET_WAITKIND_SYSCALL_ENTRY:
1428 number_of_threads_in_syscalls++;
1429 if (number_of_threads_in_syscalls == 1)
1431 TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid));
1433 resume (0, TARGET_SIGNAL_0);
1434 prepare_to_wait (ecs);
1437 /* Before examining the threads further, step this thread to
1438 get it entirely out of the syscall. (We get notice of the
1439 event when the thread is just on the verge of exiting a
1440 syscall. Stepping one instruction seems to get it back
1443 Note that although the logical place to reenable h/w watches
1444 is here, we cannot. We cannot reenable them before stepping
1445 the thread (this causes the next wait on the thread to hang).
1447 Nor can we enable them after stepping until we've done a wait.
1448 Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait
1449 here, which will be serviced immediately after the target
1451 case TARGET_WAITKIND_SYSCALL_RETURN:
1452 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0);
1454 if (number_of_threads_in_syscalls > 0)
1456 number_of_threads_in_syscalls--;
1457 ecs->enable_hw_watchpoints_after_wait =
1458 (number_of_threads_in_syscalls == 0);
1460 prepare_to_wait (ecs);
1463 case TARGET_WAITKIND_STOPPED:
1464 stop_signal = ecs->ws.value.sig;
1467 /* We had an event in the inferior, but we are not interested
1468 in handling it at this level. The lower layers have already
1469 done what needs to be done, if anything.
1471 One of the possible circumstances for this is when the
1472 inferior produces output for the console. The inferior has
1473 not stopped, and we are ignoring the event. Another possible
1474 circumstance is any event which the lower level knows will be
1475 reported multiple times without an intervening resume. */
1476 case TARGET_WAITKIND_IGNORE:
1477 prepare_to_wait (ecs);
1481 /* We may want to consider not doing a resume here in order to give
1482 the user a chance to play with the new thread. It might be good
1483 to make that a user-settable option. */
1485 /* At this point, all threads are stopped (happens automatically in
1486 either the OS or the native code). Therefore we need to continue
1487 all threads in order to make progress. */
1488 if (ecs->new_thread_event)
1490 target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0);
1491 prepare_to_wait (ecs);
1495 stop_pc = read_pc_pid (ecs->ptid);
1497 /* See if a thread hit a thread-specific breakpoint that was meant for
1498 another thread. If so, then step that thread past the breakpoint,
1501 if (stop_signal == TARGET_SIGNAL_TRAP)
1503 /* Check if a regular breakpoint has been hit before checking
1504 for a potential single step breakpoint. Otherwise, GDB will
1505 not see this breakpoint hit when stepping onto breakpoints. */
1506 if (breakpoints_inserted
1507 && breakpoint_here_p (stop_pc - DECR_PC_AFTER_BREAK))
1509 ecs->random_signal = 0;
1510 if (!breakpoint_thread_match (stop_pc - DECR_PC_AFTER_BREAK,
1515 /* Saw a breakpoint, but it was hit by the wrong thread.
1517 if (DECR_PC_AFTER_BREAK)
1518 write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK, ecs->ptid);
1520 remove_status = remove_breakpoints ();
1521 /* Did we fail to remove breakpoints? If so, try
1522 to set the PC past the bp. (There's at least
1523 one situation in which we can fail to remove
1524 the bp's: On HP-UX's that use ttrace, we can't
1525 change the address space of a vforking child
1526 process until the child exits (well, okay, not
1527 then either :-) or execs. */
1528 if (remove_status != 0)
1530 /* FIXME! This is obviously non-portable! */
1531 write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK + 4, ecs->ptid);
1532 /* We need to restart all the threads now,
1533 * unles we're running in scheduler-locked mode.
1534 * Use currently_stepping to determine whether to
1537 /* FIXME MVS: is there any reason not to call resume()? */
1538 if (scheduler_mode == schedlock_on)
1539 target_resume (ecs->ptid,
1540 currently_stepping (ecs), TARGET_SIGNAL_0);
1542 target_resume (RESUME_ALL,
1543 currently_stepping (ecs), TARGET_SIGNAL_0);
1544 prepare_to_wait (ecs);
1549 breakpoints_inserted = 0;
1550 if (!ptid_equal (inferior_ptid, ecs->ptid))
1551 context_switch (ecs);
1552 ecs->waiton_ptid = ecs->ptid;
1553 ecs->wp = &(ecs->ws);
1554 ecs->another_trap = 1;
1556 ecs->infwait_state = infwait_thread_hop_state;
1558 registers_changed ();
1563 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1565 /* Readjust the stop_pc as it is off by DECR_PC_AFTER_BREAK
1566 compared to the value it would have if the system stepping
1567 capability was used. This allows the rest of the code in
1568 this function to use this address without having to worry
1569 whether software single step is in use or not. */
1570 if (DECR_PC_AFTER_BREAK)
1572 stop_pc -= DECR_PC_AFTER_BREAK;
1573 write_pc_pid (stop_pc, ecs->ptid);
1576 sw_single_step_trap_p = 1;
1577 ecs->random_signal = 0;
1581 ecs->random_signal = 1;
1583 /* See if something interesting happened to the non-current thread. If
1584 so, then switch to that thread, and eventually give control back to
1587 Note that if there's any kind of pending follow (i.e., of a fork,
1588 vfork or exec), we don't want to do this now. Rather, we'll let
1589 the next resume handle it. */
1590 if (!ptid_equal (ecs->ptid, inferior_ptid) &&
1591 (pending_follow.kind == TARGET_WAITKIND_SPURIOUS))
1595 /* If it's a random signal for a non-current thread, notify user
1596 if he's expressed an interest. */
1597 if (ecs->random_signal && signal_print[stop_signal])
1599 /* ??rehrauer: I don't understand the rationale for this code. If the
1600 inferior will stop as a result of this signal, then the act of handling
1601 the stop ought to print a message that's couches the stoppage in user
1602 terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior
1603 won't stop as a result of the signal -- i.e., if the signal is merely
1604 a side-effect of something GDB's doing "under the covers" for the
1605 user, such as stepping threads over a breakpoint they shouldn't stop
1606 for -- then the message seems to be a serious annoyance at best.
1608 For now, remove the message altogether. */
1611 target_terminal_ours_for_output ();
1612 printf_filtered ("\nProgram received signal %s, %s.\n",
1613 target_signal_to_name (stop_signal),
1614 target_signal_to_string (stop_signal));
1615 gdb_flush (gdb_stdout);
1619 /* If it's not SIGTRAP and not a signal we want to stop for, then
1620 continue the thread. */
1622 if (stop_signal != TARGET_SIGNAL_TRAP && !signal_stop[stop_signal])
1625 target_terminal_inferior ();
1627 /* Clear the signal if it should not be passed. */
1628 if (signal_program[stop_signal] == 0)
1629 stop_signal = TARGET_SIGNAL_0;
1631 target_resume (ecs->ptid, 0, stop_signal);
1632 prepare_to_wait (ecs);
1636 /* It's a SIGTRAP or a signal we're interested in. Switch threads,
1637 and fall into the rest of wait_for_inferior(). */
1639 context_switch (ecs);
1642 context_hook (pid_to_thread_id (ecs->ptid));
1644 flush_cached_frames ();
1647 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1649 /* Pull the single step breakpoints out of the target. */
1650 SOFTWARE_SINGLE_STEP (0, 0);
1651 singlestep_breakpoints_inserted_p = 0;
1654 /* If PC is pointing at a nullified instruction, then step beyond
1655 it so that the user won't be confused when GDB appears to be ready
1658 /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */
1659 if (INSTRUCTION_NULLIFIED)
1661 registers_changed ();
1662 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0);
1664 /* We may have received a signal that we want to pass to
1665 the inferior; therefore, we must not clobber the waitstatus
1668 ecs->infwait_state = infwait_nullified_state;
1669 ecs->waiton_ptid = ecs->ptid;
1670 ecs->wp = &(ecs->tmpstatus);
1671 prepare_to_wait (ecs);
1675 /* It may not be necessary to disable the watchpoint to stop over
1676 it. For example, the PA can (with some kernel cooperation)
1677 single step over a watchpoint without disabling the watchpoint. */
1678 if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1681 prepare_to_wait (ecs);
1685 /* It is far more common to need to disable a watchpoint to step
1686 the inferior over it. FIXME. What else might a debug
1687 register or page protection watchpoint scheme need here? */
1688 if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1690 /* At this point, we are stopped at an instruction which has
1691 attempted to write to a piece of memory under control of
1692 a watchpoint. The instruction hasn't actually executed
1693 yet. If we were to evaluate the watchpoint expression
1694 now, we would get the old value, and therefore no change
1695 would seem to have occurred.
1697 In order to make watchpoints work `right', we really need
1698 to complete the memory write, and then evaluate the
1699 watchpoint expression. The following code does that by
1700 removing the watchpoint (actually, all watchpoints and
1701 breakpoints), single-stepping the target, re-inserting
1702 watchpoints, and then falling through to let normal
1703 single-step processing handle proceed. Since this
1704 includes evaluating watchpoints, things will come to a
1705 stop in the correct manner. */
1707 if (DECR_PC_AFTER_BREAK)
1708 write_pc (stop_pc - DECR_PC_AFTER_BREAK);
1710 remove_breakpoints ();
1711 registers_changed ();
1712 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */
1714 ecs->waiton_ptid = ecs->ptid;
1715 ecs->wp = &(ecs->ws);
1716 ecs->infwait_state = infwait_nonstep_watch_state;
1717 prepare_to_wait (ecs);
1721 /* It may be possible to simply continue after a watchpoint. */
1722 if (HAVE_CONTINUABLE_WATCHPOINT)
1723 STOPPED_BY_WATCHPOINT (ecs->ws);
1725 ecs->stop_func_start = 0;
1726 ecs->stop_func_end = 0;
1727 ecs->stop_func_name = 0;
1728 /* Don't care about return value; stop_func_start and stop_func_name
1729 will both be 0 if it doesn't work. */
1730 find_pc_partial_function (stop_pc, &ecs->stop_func_name,
1731 &ecs->stop_func_start, &ecs->stop_func_end);
1732 ecs->stop_func_start += FUNCTION_START_OFFSET;
1733 ecs->another_trap = 0;
1734 bpstat_clear (&stop_bpstat);
1736 stop_stack_dummy = 0;
1737 stop_print_frame = 1;
1738 ecs->random_signal = 0;
1739 stopped_by_random_signal = 0;
1740 breakpoints_failed = 0;
1742 /* Look at the cause of the stop, and decide what to do.
1743 The alternatives are:
1744 1) break; to really stop and return to the debugger,
1745 2) drop through to start up again
1746 (set ecs->another_trap to 1 to single step once)
1747 3) set ecs->random_signal to 1, and the decision between 1 and 2
1748 will be made according to the signal handling tables. */
1750 /* First, distinguish signals caused by the debugger from signals
1751 that have to do with the program's own actions.
1752 Note that breakpoint insns may cause SIGTRAP or SIGILL
1753 or SIGEMT, depending on the operating system version.
1754 Here we detect when a SIGILL or SIGEMT is really a breakpoint
1755 and change it to SIGTRAP. */
1757 if (stop_signal == TARGET_SIGNAL_TRAP
1758 || (breakpoints_inserted &&
1759 (stop_signal == TARGET_SIGNAL_ILL
1760 || stop_signal == TARGET_SIGNAL_EMT)) || stop_soon_quietly)
1762 if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap)
1764 stop_print_frame = 0;
1765 stop_stepping (ecs);
1768 if (stop_soon_quietly)
1770 stop_stepping (ecs);
1774 /* Don't even think about breakpoints
1775 if just proceeded over a breakpoint.
1777 However, if we are trying to proceed over a breakpoint
1778 and end up in sigtramp, then through_sigtramp_breakpoint
1779 will be set and we should check whether we've hit the
1781 if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected
1782 && through_sigtramp_breakpoint == NULL)
1783 bpstat_clear (&stop_bpstat);
1786 /* See if there is a breakpoint at the current PC. */
1788 /* The second argument of bpstat_stop_status is meant to help
1789 distinguish between a breakpoint trap and a singlestep trap.
1790 This is only important on targets where DECR_PC_AFTER_BREAK
1791 is non-zero. The prev_pc test is meant to distinguish between
1792 singlestepping a trap instruction, and singlestepping thru a
1793 jump to the instruction following a trap instruction.
1795 Therefore, pass TRUE if our reason for stopping is
1796 something other than hitting a breakpoint. We do this by
1797 checking that either: we detected earlier a software single
1798 step trap or, 1) stepping is going on and 2) we didn't hit
1799 a breakpoint in a signal handler without an intervening stop
1800 in sigtramp, which is detected by a new stack pointer value
1801 below any usual function calling stack adjustments. */
1805 sw_single_step_trap_p
1806 || (currently_stepping (ecs)
1807 && prev_pc != stop_pc - DECR_PC_AFTER_BREAK
1809 && INNER_THAN (read_sp (), (step_sp - 16)))));
1810 /* Following in case break condition called a
1812 stop_print_frame = 1;
1815 /* NOTE: cagney/2003-03-29: These two checks for a random signal
1816 at one stage in the past included checks for an inferior
1817 function call's call dummy's return breakpoint. The original
1818 comment, that went with the test, read:
1820 ``End of a stack dummy. Some systems (e.g. Sony news) give
1821 another signal besides SIGTRAP, so check here as well as
1824 If someone ever tries to get get call dummys on a
1825 non-executable stack to work (where the target would stop
1826 with something like a SIGSEG), then those tests might need to
1827 be re-instated. Given, however, that the tests were only
1828 enabled when momentary breakpoints were not being used, I
1829 suspect that it won't be the case. */
1831 if (stop_signal == TARGET_SIGNAL_TRAP)
1833 = !(bpstat_explains_signal (stop_bpstat)
1835 || (step_range_end && step_resume_breakpoint == NULL));
1838 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1839 if (!ecs->random_signal)
1840 stop_signal = TARGET_SIGNAL_TRAP;
1844 /* When we reach this point, we've pretty much decided
1845 that the reason for stopping must've been a random
1846 (unexpected) signal. */
1849 ecs->random_signal = 1;
1851 process_event_stop_test:
1852 /* For the program's own signals, act according to
1853 the signal handling tables. */
1855 if (ecs->random_signal)
1857 /* Signal not for debugging purposes. */
1860 stopped_by_random_signal = 1;
1862 if (signal_print[stop_signal])
1865 target_terminal_ours_for_output ();
1866 print_stop_reason (SIGNAL_RECEIVED, stop_signal);
1868 if (signal_stop[stop_signal])
1870 stop_stepping (ecs);
1873 /* If not going to stop, give terminal back
1874 if we took it away. */
1876 target_terminal_inferior ();
1878 /* Clear the signal if it should not be passed. */
1879 if (signal_program[stop_signal] == 0)
1880 stop_signal = TARGET_SIGNAL_0;
1882 /* I'm not sure whether this needs to be check_sigtramp2 or
1883 whether it could/should be keep_going.
1885 This used to jump to step_over_function if we are stepping,
1888 Suppose the user does a `next' over a function call, and while
1889 that call is in progress, the inferior receives a signal for
1890 which GDB does not stop (i.e., signal_stop[SIG] is false). In
1891 that case, when we reach this point, there is already a
1892 step-resume breakpoint established, right where it should be:
1893 immediately after the function call the user is "next"-ing
1894 over. If we call step_over_function now, two bad things
1897 - we'll create a new breakpoint, at wherever the current
1898 frame's return address happens to be. That could be
1899 anywhere, depending on what function call happens to be on
1900 the top of the stack at that point. Point is, it's probably
1901 not where we need it.
1903 - the existing step-resume breakpoint (which is at the correct
1904 address) will get orphaned: step_resume_breakpoint will point
1905 to the new breakpoint, and the old step-resume breakpoint
1906 will never be cleaned up.
1908 The old behavior was meant to help HP-UX single-step out of
1909 sigtramps. It would place the new breakpoint at prev_pc, which
1910 was certainly wrong. I don't know the details there, so fixing
1911 this probably breaks that. As with anything else, it's up to
1912 the HP-UX maintainer to furnish a fix that doesn't break other
1913 platforms. --JimB, 20 May 1999 */
1914 check_sigtramp2 (ecs);
1919 /* Handle cases caused by hitting a breakpoint. */
1921 CORE_ADDR jmp_buf_pc;
1922 struct bpstat_what what;
1924 what = bpstat_what (stop_bpstat);
1926 if (what.call_dummy)
1928 stop_stack_dummy = 1;
1930 trap_expected_after_continue = 1;
1934 switch (what.main_action)
1936 case BPSTAT_WHAT_SET_LONGJMP_RESUME:
1937 /* If we hit the breakpoint at longjmp, disable it for the
1938 duration of this command. Then, install a temporary
1939 breakpoint at the target of the jmp_buf. */
1940 disable_longjmp_breakpoint ();
1941 remove_breakpoints ();
1942 breakpoints_inserted = 0;
1943 if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc))
1949 /* Need to blow away step-resume breakpoint, as it
1950 interferes with us */
1951 if (step_resume_breakpoint != NULL)
1953 delete_step_resume_breakpoint (&step_resume_breakpoint);
1955 /* Not sure whether we need to blow this away too, but probably
1956 it is like the step-resume breakpoint. */
1957 if (through_sigtramp_breakpoint != NULL)
1959 delete_breakpoint (through_sigtramp_breakpoint);
1960 through_sigtramp_breakpoint = NULL;
1964 /* FIXME - Need to implement nested temporary breakpoints */
1965 if (step_over_calls > 0)
1966 set_longjmp_resume_breakpoint (jmp_buf_pc, get_current_frame ());
1969 set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id);
1970 ecs->handling_longjmp = 1; /* FIXME */
1974 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME:
1975 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE:
1976 remove_breakpoints ();
1977 breakpoints_inserted = 0;
1979 /* FIXME - Need to implement nested temporary breakpoints */
1981 && (frame_id_inner (get_frame_id (get_current_frame ()),
1984 ecs->another_trap = 1;
1989 disable_longjmp_breakpoint ();
1990 ecs->handling_longjmp = 0; /* FIXME */
1991 if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME)
1993 /* else fallthrough */
1995 case BPSTAT_WHAT_SINGLE:
1996 if (breakpoints_inserted)
1998 remove_breakpoints ();
2000 breakpoints_inserted = 0;
2001 ecs->another_trap = 1;
2002 /* Still need to check other stuff, at least the case
2003 where we are stepping and step out of the right range. */
2006 case BPSTAT_WHAT_STOP_NOISY:
2007 stop_print_frame = 1;
2009 /* We are about to nuke the step_resume_breakpoint and
2010 through_sigtramp_breakpoint via the cleanup chain, so
2011 no need to worry about it here. */
2013 stop_stepping (ecs);
2016 case BPSTAT_WHAT_STOP_SILENT:
2017 stop_print_frame = 0;
2019 /* We are about to nuke the step_resume_breakpoint and
2020 through_sigtramp_breakpoint via the cleanup chain, so
2021 no need to worry about it here. */
2023 stop_stepping (ecs);
2026 case BPSTAT_WHAT_STEP_RESUME:
2027 /* This proably demands a more elegant solution, but, yeah
2030 This function's use of the simple variable
2031 step_resume_breakpoint doesn't seem to accomodate
2032 simultaneously active step-resume bp's, although the
2033 breakpoint list certainly can.
2035 If we reach here and step_resume_breakpoint is already
2036 NULL, then apparently we have multiple active
2037 step-resume bp's. We'll just delete the breakpoint we
2038 stopped at, and carry on.
2040 Correction: what the code currently does is delete a
2041 step-resume bp, but it makes no effort to ensure that
2042 the one deleted is the one currently stopped at. MVS */
2044 if (step_resume_breakpoint == NULL)
2046 step_resume_breakpoint =
2047 bpstat_find_step_resume_breakpoint (stop_bpstat);
2049 delete_step_resume_breakpoint (&step_resume_breakpoint);
2052 case BPSTAT_WHAT_THROUGH_SIGTRAMP:
2053 if (through_sigtramp_breakpoint)
2054 delete_breakpoint (through_sigtramp_breakpoint);
2055 through_sigtramp_breakpoint = NULL;
2057 /* If were waiting for a trap, hitting the step_resume_break
2058 doesn't count as getting it. */
2060 ecs->another_trap = 1;
2063 case BPSTAT_WHAT_CHECK_SHLIBS:
2064 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK:
2067 /* Remove breakpoints, we eventually want to step over the
2068 shlib event breakpoint, and SOLIB_ADD might adjust
2069 breakpoint addresses via breakpoint_re_set. */
2070 if (breakpoints_inserted)
2071 remove_breakpoints ();
2072 breakpoints_inserted = 0;
2074 /* Check for any newly added shared libraries if we're
2075 supposed to be adding them automatically. Switch
2076 terminal for any messages produced by
2077 breakpoint_re_set. */
2078 target_terminal_ours_for_output ();
2079 SOLIB_ADD (NULL, 0, NULL, auto_solib_add);
2080 target_terminal_inferior ();
2082 /* Try to reenable shared library breakpoints, additional
2083 code segments in shared libraries might be mapped in now. */
2084 re_enable_breakpoints_in_shlibs ();
2086 /* If requested, stop when the dynamic linker notifies
2087 gdb of events. This allows the user to get control
2088 and place breakpoints in initializer routines for
2089 dynamically loaded objects (among other things). */
2090 if (stop_on_solib_events)
2092 stop_stepping (ecs);
2096 /* If we stopped due to an explicit catchpoint, then the
2097 (see above) call to SOLIB_ADD pulled in any symbols
2098 from a newly-loaded library, if appropriate.
2100 We do want the inferior to stop, but not where it is
2101 now, which is in the dynamic linker callback. Rather,
2102 we would like it stop in the user's program, just after
2103 the call that caused this catchpoint to trigger. That
2104 gives the user a more useful vantage from which to
2105 examine their program's state. */
2106 else if (what.main_action ==
2107 BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK)
2109 /* ??rehrauer: If I could figure out how to get the
2110 right return PC from here, we could just set a temp
2111 breakpoint and resume. I'm not sure we can without
2112 cracking open the dld's shared libraries and sniffing
2113 their unwind tables and text/data ranges, and that's
2114 not a terribly portable notion.
2116 Until that time, we must step the inferior out of the
2117 dld callback, and also out of the dld itself (and any
2118 code or stubs in libdld.sl, such as "shl_load" and
2119 friends) until we reach non-dld code. At that point,
2120 we can stop stepping. */
2121 bpstat_get_triggered_catchpoints (stop_bpstat,
2123 stepping_through_solib_catchpoints);
2124 ecs->stepping_through_solib_after_catch = 1;
2126 /* Be sure to lift all breakpoints, so the inferior does
2127 actually step past this point... */
2128 ecs->another_trap = 1;
2133 /* We want to step over this breakpoint, then keep going. */
2134 ecs->another_trap = 1;
2141 case BPSTAT_WHAT_LAST:
2142 /* Not a real code, but listed here to shut up gcc -Wall. */
2144 case BPSTAT_WHAT_KEEP_CHECKING:
2149 /* We come here if we hit a breakpoint but should not
2150 stop for it. Possibly we also were stepping
2151 and should stop for that. So fall through and
2152 test for stepping. But, if not stepping,
2155 /* Are we stepping to get the inferior out of the dynamic
2156 linker's hook (and possibly the dld itself) after catching
2158 if (ecs->stepping_through_solib_after_catch)
2160 #if defined(SOLIB_ADD)
2161 /* Have we reached our destination? If not, keep going. */
2162 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc))
2164 ecs->another_trap = 1;
2169 /* Else, stop and report the catchpoint(s) whose triggering
2170 caused us to begin stepping. */
2171 ecs->stepping_through_solib_after_catch = 0;
2172 bpstat_clear (&stop_bpstat);
2173 stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints);
2174 bpstat_clear (&ecs->stepping_through_solib_catchpoints);
2175 stop_print_frame = 1;
2176 stop_stepping (ecs);
2180 if (step_resume_breakpoint)
2182 /* Having a step-resume breakpoint overrides anything
2183 else having to do with stepping commands until
2184 that breakpoint is reached. */
2185 /* I'm not sure whether this needs to be check_sigtramp2 or
2186 whether it could/should be keep_going. */
2187 check_sigtramp2 (ecs);
2192 if (step_range_end == 0)
2194 /* Likewise if we aren't even stepping. */
2195 /* I'm not sure whether this needs to be check_sigtramp2 or
2196 whether it could/should be keep_going. */
2197 check_sigtramp2 (ecs);
2202 /* If stepping through a line, keep going if still within it.
2204 Note that step_range_end is the address of the first instruction
2205 beyond the step range, and NOT the address of the last instruction
2207 if (stop_pc >= step_range_start && stop_pc < step_range_end)
2209 /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal.
2210 So definately need to check for sigtramp here. */
2211 check_sigtramp2 (ecs);
2216 /* We stepped out of the stepping range. */
2218 /* If we are stepping at the source level and entered the runtime
2219 loader dynamic symbol resolution code, we keep on single stepping
2220 until we exit the run time loader code and reach the callee's
2222 if (step_over_calls == STEP_OVER_UNDEBUGGABLE
2223 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc))
2225 CORE_ADDR pc_after_resolver = SKIP_SOLIB_RESOLVER (stop_pc);
2227 if (pc_after_resolver)
2229 /* Set up a step-resume breakpoint at the address
2230 indicated by SKIP_SOLIB_RESOLVER. */
2231 struct symtab_and_line sr_sal;
2233 sr_sal.pc = pc_after_resolver;
2235 check_for_old_step_resume_breakpoint ();
2236 step_resume_breakpoint =
2237 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2238 if (breakpoints_inserted)
2239 insert_breakpoints ();
2246 /* We can't update step_sp every time through the loop, because
2247 reading the stack pointer would slow down stepping too much.
2248 But we can update it every time we leave the step range. */
2249 ecs->update_step_sp = 1;
2251 /* Did we just take a signal? */
2252 if (PC_IN_SIGTRAMP (stop_pc, ecs->stop_func_name)
2253 && !PC_IN_SIGTRAMP (prev_pc, prev_func_name)
2254 && INNER_THAN (read_sp (), step_sp))
2256 /* We've just taken a signal; go until we are back to
2257 the point where we took it and one more. */
2259 /* Note: The test above succeeds not only when we stepped
2260 into a signal handler, but also when we step past the last
2261 statement of a signal handler and end up in the return stub
2262 of the signal handler trampoline. To distinguish between
2263 these two cases, check that the frame is INNER_THAN the
2264 previous one below. pai/1997-09-11 */
2268 struct frame_id current_frame = get_frame_id (get_current_frame ());
2270 if (frame_id_inner (current_frame, step_frame_id))
2272 /* We have just taken a signal; go until we are back to
2273 the point where we took it and one more. */
2275 /* This code is needed at least in the following case:
2276 The user types "next" and then a signal arrives (before
2277 the "next" is done). */
2279 /* Note that if we are stopped at a breakpoint, then we need
2280 the step_resume breakpoint to override any breakpoints at
2281 the same location, so that we will still step over the
2282 breakpoint even though the signal happened. */
2283 struct symtab_and_line sr_sal;
2286 sr_sal.symtab = NULL;
2288 sr_sal.pc = prev_pc;
2289 /* We could probably be setting the frame to
2290 step_frame_id; I don't think anyone thought to try it. */
2291 check_for_old_step_resume_breakpoint ();
2292 step_resume_breakpoint =
2293 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2294 if (breakpoints_inserted)
2295 insert_breakpoints ();
2299 /* We just stepped out of a signal handler and into
2300 its calling trampoline.
2302 Normally, we'd call step_over_function from
2303 here, but for some reason GDB can't unwind the
2304 stack correctly to find the real PC for the point
2305 user code where the signal trampoline will return
2306 -- FRAME_SAVED_PC fails, at least on HP-UX 10.20.
2307 But signal trampolines are pretty small stubs of
2308 code, anyway, so it's OK instead to just
2309 single-step out. Note: assuming such trampolines
2310 don't exhibit recursion on any platform... */
2311 find_pc_partial_function (stop_pc, &ecs->stop_func_name,
2312 &ecs->stop_func_start,
2313 &ecs->stop_func_end);
2314 /* Readjust stepping range */
2315 step_range_start = ecs->stop_func_start;
2316 step_range_end = ecs->stop_func_end;
2317 ecs->stepping_through_sigtramp = 1;
2322 /* If this is stepi or nexti, make sure that the stepping range
2323 gets us past that instruction. */
2324 if (step_range_end == 1)
2325 /* FIXME: Does this run afoul of the code below which, if
2326 we step into the middle of a line, resets the stepping
2328 step_range_end = (step_range_start = prev_pc) + 1;
2330 ecs->remove_breakpoints_on_following_step = 1;
2335 if (stop_pc == ecs->stop_func_start /* Quick test */
2336 || (in_prologue (stop_pc, ecs->stop_func_start) &&
2337 !IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name))
2338 || IN_SOLIB_CALL_TRAMPOLINE (stop_pc, ecs->stop_func_name)
2339 || ecs->stop_func_name == 0)
2341 /* It's a subroutine call. */
2343 if ((step_over_calls == STEP_OVER_NONE)
2344 || ((step_range_end == 1)
2345 && in_prologue (prev_pc, ecs->stop_func_start)))
2347 /* I presume that step_over_calls is only 0 when we're
2348 supposed to be stepping at the assembly language level
2349 ("stepi"). Just stop. */
2350 /* Also, maybe we just did a "nexti" inside a prolog,
2351 so we thought it was a subroutine call but it was not.
2352 Stop as well. FENN */
2354 print_stop_reason (END_STEPPING_RANGE, 0);
2355 stop_stepping (ecs);
2359 if (step_over_calls == STEP_OVER_ALL || IGNORE_HELPER_CALL (stop_pc))
2361 /* We're doing a "next". */
2363 if (PC_IN_SIGTRAMP (stop_pc, ecs->stop_func_name)
2364 && frame_id_inner (step_frame_id,
2365 frame_id_build (read_sp (), 0)))
2366 /* We stepped out of a signal handler, and into its
2367 calling trampoline. This is misdetected as a
2368 subroutine call, but stepping over the signal
2369 trampoline isn't such a bad idea. In order to do that,
2370 we have to ignore the value in step_frame_id, since
2371 that doesn't represent the frame that'll reach when we
2372 return from the signal trampoline. Otherwise we'll
2373 probably continue to the end of the program. */
2374 step_frame_id = null_frame_id;
2376 step_over_function (ecs);
2381 /* If we are in a function call trampoline (a stub between
2382 the calling routine and the real function), locate the real
2383 function. That's what tells us (a) whether we want to step
2384 into it at all, and (b) what prologue we want to run to
2385 the end of, if we do step into it. */
2386 real_stop_pc = skip_language_trampoline (stop_pc);
2387 if (real_stop_pc == 0)
2388 real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc);
2389 if (real_stop_pc != 0)
2390 ecs->stop_func_start = real_stop_pc;
2392 /* If we have line number information for the function we
2393 are thinking of stepping into, step into it.
2395 If there are several symtabs at that PC (e.g. with include
2396 files), just want to know whether *any* of them have line
2397 numbers. find_pc_line handles this. */
2399 struct symtab_and_line tmp_sal;
2401 tmp_sal = find_pc_line (ecs->stop_func_start, 0);
2402 if (tmp_sal.line != 0)
2404 step_into_function (ecs);
2409 /* If we have no line number and the step-stop-if-no-debug
2410 is set, we stop the step so that the user has a chance to
2411 switch in assembly mode. */
2412 if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug)
2415 print_stop_reason (END_STEPPING_RANGE, 0);
2416 stop_stepping (ecs);
2420 step_over_function (ecs);
2426 /* We've wandered out of the step range. */
2428 ecs->sal = find_pc_line (stop_pc, 0);
2430 if (step_range_end == 1)
2432 /* It is stepi or nexti. We always want to stop stepping after
2435 print_stop_reason (END_STEPPING_RANGE, 0);
2436 stop_stepping (ecs);
2440 /* If we're in the return path from a shared library trampoline,
2441 we want to proceed through the trampoline when stepping. */
2442 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name))
2444 /* Determine where this trampoline returns. */
2445 real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc);
2447 /* Only proceed through if we know where it's going. */
2450 /* And put the step-breakpoint there and go until there. */
2451 struct symtab_and_line sr_sal;
2453 init_sal (&sr_sal); /* initialize to zeroes */
2454 sr_sal.pc = real_stop_pc;
2455 sr_sal.section = find_pc_overlay (sr_sal.pc);
2456 /* Do not specify what the fp should be when we stop
2457 since on some machines the prologue
2458 is where the new fp value is established. */
2459 check_for_old_step_resume_breakpoint ();
2460 step_resume_breakpoint =
2461 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2462 if (breakpoints_inserted)
2463 insert_breakpoints ();
2465 /* Restart without fiddling with the step ranges or
2472 if (ecs->sal.line == 0)
2474 /* We have no line number information. That means to stop
2475 stepping (does this always happen right after one instruction,
2476 when we do "s" in a function with no line numbers,
2477 or can this happen as a result of a return or longjmp?). */
2479 print_stop_reason (END_STEPPING_RANGE, 0);
2480 stop_stepping (ecs);
2484 if ((stop_pc == ecs->sal.pc)
2485 && (ecs->current_line != ecs->sal.line
2486 || ecs->current_symtab != ecs->sal.symtab))
2488 /* We are at the start of a different line. So stop. Note that
2489 we don't stop if we step into the middle of a different line.
2490 That is said to make things like for (;;) statements work
2493 print_stop_reason (END_STEPPING_RANGE, 0);
2494 stop_stepping (ecs);
2498 /* We aren't done stepping.
2500 Optimize by setting the stepping range to the line.
2501 (We might not be in the original line, but if we entered a
2502 new line in mid-statement, we continue stepping. This makes
2503 things like for(;;) statements work better.) */
2505 if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end)
2507 /* If this is the last line of the function, don't keep stepping
2508 (it would probably step us out of the function).
2509 This is particularly necessary for a one-line function,
2510 in which after skipping the prologue we better stop even though
2511 we will be in mid-line. */
2513 print_stop_reason (END_STEPPING_RANGE, 0);
2514 stop_stepping (ecs);
2517 step_range_start = ecs->sal.pc;
2518 step_range_end = ecs->sal.end;
2519 step_frame_id = get_frame_id (get_current_frame ());
2520 ecs->current_line = ecs->sal.line;
2521 ecs->current_symtab = ecs->sal.symtab;
2523 /* In the case where we just stepped out of a function into the
2524 middle of a line of the caller, continue stepping, but
2525 step_frame_id must be modified to current frame */
2527 struct frame_id current_frame = get_frame_id (get_current_frame ());
2528 if (!(frame_id_inner (current_frame, step_frame_id)))
2529 step_frame_id = current_frame;
2535 /* Are we in the middle of stepping? */
2538 currently_stepping (struct execution_control_state *ecs)
2540 return ((through_sigtramp_breakpoint == NULL
2541 && !ecs->handling_longjmp
2542 && ((step_range_end && step_resume_breakpoint == NULL)
2544 || ecs->stepping_through_solib_after_catch
2545 || bpstat_should_step ());
2549 check_sigtramp2 (struct execution_control_state *ecs)
2552 && PC_IN_SIGTRAMP (stop_pc, ecs->stop_func_name)
2553 && !PC_IN_SIGTRAMP (prev_pc, prev_func_name)
2554 && INNER_THAN (read_sp (), step_sp))
2556 /* What has happened here is that we have just stepped the
2557 inferior with a signal (because it is a signal which
2558 shouldn't make us stop), thus stepping into sigtramp.
2560 So we need to set a step_resume_break_address breakpoint and
2561 continue until we hit it, and then step. FIXME: This should
2562 be more enduring than a step_resume breakpoint; we should
2563 know that we will later need to keep going rather than
2564 re-hitting the breakpoint here (see the testsuite,
2565 gdb.base/signals.exp where it says "exceedingly difficult"). */
2567 struct symtab_and_line sr_sal;
2569 init_sal (&sr_sal); /* initialize to zeroes */
2570 sr_sal.pc = prev_pc;
2571 sr_sal.section = find_pc_overlay (sr_sal.pc);
2572 /* We perhaps could set the frame if we kept track of what the
2573 frame corresponding to prev_pc was. But we don't, so don't. */
2574 through_sigtramp_breakpoint =
2575 set_momentary_breakpoint (sr_sal, null_frame_id, bp_through_sigtramp);
2576 if (breakpoints_inserted)
2577 insert_breakpoints ();
2579 ecs->remove_breakpoints_on_following_step = 1;
2580 ecs->another_trap = 1;
2584 /* Subroutine call with source code we should not step over. Do step
2585 to the first line of code in it. */
2588 step_into_function (struct execution_control_state *ecs)
2591 struct symtab_and_line sr_sal;
2593 s = find_pc_symtab (stop_pc);
2594 if (s && s->language != language_asm)
2595 ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start);
2597 ecs->sal = find_pc_line (ecs->stop_func_start, 0);
2598 /* Use the step_resume_break to step until the end of the prologue,
2599 even if that involves jumps (as it seems to on the vax under
2601 /* If the prologue ends in the middle of a source line, continue to
2602 the end of that source line (if it is still within the function).
2603 Otherwise, just go to end of prologue. */
2604 #ifdef PROLOGUE_FIRSTLINE_OVERLAP
2605 /* no, don't either. It skips any code that's legitimately on the
2609 && ecs->sal.pc != ecs->stop_func_start
2610 && ecs->sal.end < ecs->stop_func_end)
2611 ecs->stop_func_start = ecs->sal.end;
2614 if (ecs->stop_func_start == stop_pc)
2616 /* We are already there: stop now. */
2618 print_stop_reason (END_STEPPING_RANGE, 0);
2619 stop_stepping (ecs);
2624 /* Put the step-breakpoint there and go until there. */
2625 init_sal (&sr_sal); /* initialize to zeroes */
2626 sr_sal.pc = ecs->stop_func_start;
2627 sr_sal.section = find_pc_overlay (ecs->stop_func_start);
2628 /* Do not specify what the fp should be when we stop since on
2629 some machines the prologue is where the new fp value is
2631 check_for_old_step_resume_breakpoint ();
2632 step_resume_breakpoint =
2633 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2634 if (breakpoints_inserted)
2635 insert_breakpoints ();
2637 /* And make sure stepping stops right away then. */
2638 step_range_end = step_range_start;
2643 /* We've just entered a callee, and we wish to resume until it returns
2644 to the caller. Setting a step_resume breakpoint on the return
2645 address will catch a return from the callee.
2647 However, if the callee is recursing, we want to be careful not to
2648 catch returns of those recursive calls, but only of THIS instance
2651 To do this, we set the step_resume bp's frame to our current
2652 caller's frame (step_frame_id, which is set by the "next" or
2653 "until" command, before execution begins). */
2656 step_over_function (struct execution_control_state *ecs)
2658 struct symtab_and_line sr_sal;
2660 init_sal (&sr_sal); /* initialize to zeros */
2661 sr_sal.pc = ADDR_BITS_REMOVE (SAVED_PC_AFTER_CALL (get_current_frame ()));
2662 sr_sal.section = find_pc_overlay (sr_sal.pc);
2664 check_for_old_step_resume_breakpoint ();
2665 step_resume_breakpoint =
2666 set_momentary_breakpoint (sr_sal, get_frame_id (get_current_frame ()),
2669 if (frame_id_p (step_frame_id)
2670 && !IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal.pc))
2671 step_resume_breakpoint->frame_id = step_frame_id;
2673 if (breakpoints_inserted)
2674 insert_breakpoints ();
2678 stop_stepping (struct execution_control_state *ecs)
2680 if (target_has_execution)
2682 /* Assuming the inferior still exists, set these up for next
2683 time, just like we did above if we didn't break out of the
2685 prev_pc = read_pc ();
2686 prev_func_start = ecs->stop_func_start;
2687 prev_func_name = ecs->stop_func_name;
2690 /* Let callers know we don't want to wait for the inferior anymore. */
2691 ecs->wait_some_more = 0;
2694 /* This function handles various cases where we need to continue
2695 waiting for the inferior. */
2696 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2699 keep_going (struct execution_control_state *ecs)
2701 /* Save the pc before execution, to compare with pc after stop. */
2702 prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */
2703 prev_func_start = ecs->stop_func_start; /* Ok, since if DECR_PC_AFTER
2704 BREAK is defined, the
2705 original pc would not have
2706 been at the start of a
2708 prev_func_name = ecs->stop_func_name;
2710 if (ecs->update_step_sp)
2711 step_sp = read_sp ();
2712 ecs->update_step_sp = 0;
2714 /* If we did not do break;, it means we should keep running the
2715 inferior and not return to debugger. */
2717 if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP)
2719 /* We took a signal (which we are supposed to pass through to
2720 the inferior, else we'd have done a break above) and we
2721 haven't yet gotten our trap. Simply continue. */
2722 resume (currently_stepping (ecs), stop_signal);
2726 /* Either the trap was not expected, but we are continuing
2727 anyway (the user asked that this signal be passed to the
2730 The signal was SIGTRAP, e.g. it was our signal, but we
2731 decided we should resume from it.
2733 We're going to run this baby now!
2735 Insert breakpoints now, unless we are trying to one-proceed
2736 past a breakpoint. */
2737 /* If we've just finished a special step resume and we don't
2738 want to hit a breakpoint, pull em out. */
2739 if (step_resume_breakpoint == NULL
2740 && through_sigtramp_breakpoint == NULL
2741 && ecs->remove_breakpoints_on_following_step)
2743 ecs->remove_breakpoints_on_following_step = 0;
2744 remove_breakpoints ();
2745 breakpoints_inserted = 0;
2747 else if (!breakpoints_inserted &&
2748 (through_sigtramp_breakpoint != NULL || !ecs->another_trap))
2750 breakpoints_failed = insert_breakpoints ();
2751 if (breakpoints_failed)
2753 stop_stepping (ecs);
2756 breakpoints_inserted = 1;
2759 trap_expected = ecs->another_trap;
2761 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2762 specifies that such a signal should be delivered to the
2765 Typically, this would occure when a user is debugging a
2766 target monitor on a simulator: the target monitor sets a
2767 breakpoint; the simulator encounters this break-point and
2768 halts the simulation handing control to GDB; GDB, noteing
2769 that the break-point isn't valid, returns control back to the
2770 simulator; the simulator then delivers the hardware
2771 equivalent of a SIGNAL_TRAP to the program being debugged. */
2773 if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal])
2774 stop_signal = TARGET_SIGNAL_0;
2776 #ifdef SHIFT_INST_REGS
2777 /* I'm not sure when this following segment applies. I do know,
2778 now, that we shouldn't rewrite the regs when we were stopped
2779 by a random signal from the inferior process. */
2780 /* FIXME: Shouldn't this be based on the valid bit of the SXIP?
2781 (this is only used on the 88k). */
2783 if (!bpstat_explains_signal (stop_bpstat)
2784 && (stop_signal != TARGET_SIGNAL_CHLD) && !stopped_by_random_signal)
2786 #endif /* SHIFT_INST_REGS */
2788 resume (currently_stepping (ecs), stop_signal);
2791 prepare_to_wait (ecs);
2794 /* This function normally comes after a resume, before
2795 handle_inferior_event exits. It takes care of any last bits of
2796 housekeeping, and sets the all-important wait_some_more flag. */
2799 prepare_to_wait (struct execution_control_state *ecs)
2801 if (ecs->infwait_state == infwait_normal_state)
2803 overlay_cache_invalid = 1;
2805 /* We have to invalidate the registers BEFORE calling
2806 target_wait because they can be loaded from the target while
2807 in target_wait. This makes remote debugging a bit more
2808 efficient for those targets that provide critical registers
2809 as part of their normal status mechanism. */
2811 registers_changed ();
2812 ecs->waiton_ptid = pid_to_ptid (-1);
2813 ecs->wp = &(ecs->ws);
2815 /* This is the old end of the while loop. Let everybody know we
2816 want to wait for the inferior some more and get called again
2818 ecs->wait_some_more = 1;
2821 /* Print why the inferior has stopped. We always print something when
2822 the inferior exits, or receives a signal. The rest of the cases are
2823 dealt with later on in normal_stop() and print_it_typical(). Ideally
2824 there should be a call to this function from handle_inferior_event()
2825 each time stop_stepping() is called.*/
2827 print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info)
2829 switch (stop_reason)
2832 /* We don't deal with these cases from handle_inferior_event()
2835 case END_STEPPING_RANGE:
2836 /* We are done with a step/next/si/ni command. */
2837 /* For now print nothing. */
2838 /* Print a message only if not in the middle of doing a "step n"
2839 operation for n > 1 */
2840 if (!step_multi || !stop_step)
2841 if (ui_out_is_mi_like_p (uiout))
2842 ui_out_field_string (uiout, "reason", "end-stepping-range");
2844 case BREAKPOINT_HIT:
2845 /* We found a breakpoint. */
2846 /* For now print nothing. */
2849 /* The inferior was terminated by a signal. */
2850 annotate_signalled ();
2851 if (ui_out_is_mi_like_p (uiout))
2852 ui_out_field_string (uiout, "reason", "exited-signalled");
2853 ui_out_text (uiout, "\nProgram terminated with signal ");
2854 annotate_signal_name ();
2855 ui_out_field_string (uiout, "signal-name",
2856 target_signal_to_name (stop_info));
2857 annotate_signal_name_end ();
2858 ui_out_text (uiout, ", ");
2859 annotate_signal_string ();
2860 ui_out_field_string (uiout, "signal-meaning",
2861 target_signal_to_string (stop_info));
2862 annotate_signal_string_end ();
2863 ui_out_text (uiout, ".\n");
2864 ui_out_text (uiout, "The program no longer exists.\n");
2867 /* The inferior program is finished. */
2868 annotate_exited (stop_info);
2871 if (ui_out_is_mi_like_p (uiout))
2872 ui_out_field_string (uiout, "reason", "exited");
2873 ui_out_text (uiout, "\nProgram exited with code ");
2874 ui_out_field_fmt (uiout, "exit-code", "0%o",
2875 (unsigned int) stop_info);
2876 ui_out_text (uiout, ".\n");
2880 if (ui_out_is_mi_like_p (uiout))
2881 ui_out_field_string (uiout, "reason", "exited-normally");
2882 ui_out_text (uiout, "\nProgram exited normally.\n");
2885 case SIGNAL_RECEIVED:
2886 /* Signal received. The signal table tells us to print about
2889 ui_out_text (uiout, "\nProgram received signal ");
2890 annotate_signal_name ();
2891 if (ui_out_is_mi_like_p (uiout))
2892 ui_out_field_string (uiout, "reason", "signal-received");
2893 ui_out_field_string (uiout, "signal-name",
2894 target_signal_to_name (stop_info));
2895 annotate_signal_name_end ();
2896 ui_out_text (uiout, ", ");
2897 annotate_signal_string ();
2898 ui_out_field_string (uiout, "signal-meaning",
2899 target_signal_to_string (stop_info));
2900 annotate_signal_string_end ();
2901 ui_out_text (uiout, ".\n");
2904 internal_error (__FILE__, __LINE__,
2905 "print_stop_reason: unrecognized enum value");
2911 /* Here to return control to GDB when the inferior stops for real.
2912 Print appropriate messages, remove breakpoints, give terminal our modes.
2914 STOP_PRINT_FRAME nonzero means print the executing frame
2915 (pc, function, args, file, line number and line text).
2916 BREAKPOINTS_FAILED nonzero means stop was due to error
2917 attempting to insert breakpoints. */
2922 /* As with the notification of thread events, we want to delay
2923 notifying the user that we've switched thread context until
2924 the inferior actually stops.
2926 (Note that there's no point in saying anything if the inferior
2928 if (!ptid_equal (previous_inferior_ptid, inferior_ptid)
2929 && target_has_execution)
2931 target_terminal_ours_for_output ();
2932 printf_filtered ("[Switching to %s]\n",
2933 target_pid_or_tid_to_str (inferior_ptid));
2934 previous_inferior_ptid = inferior_ptid;
2937 /* Make sure that the current_frame's pc is correct. This
2938 is a correction for setting up the frame info before doing
2939 DECR_PC_AFTER_BREAK */
2940 if (target_has_execution)
2941 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
2942 DECR_PC_AFTER_BREAK, the program counter can change. Ask the
2943 frame code to check for this and sort out any resultant mess.
2944 DECR_PC_AFTER_BREAK needs to just go away. */
2945 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
2947 if (target_has_execution && breakpoints_inserted)
2949 if (remove_breakpoints ())
2951 target_terminal_ours_for_output ();
2952 printf_filtered ("Cannot remove breakpoints because ");
2953 printf_filtered ("program is no longer writable.\n");
2954 printf_filtered ("It might be running in another process.\n");
2955 printf_filtered ("Further execution is probably impossible.\n");
2958 breakpoints_inserted = 0;
2960 /* Delete the breakpoint we stopped at, if it wants to be deleted.
2961 Delete any breakpoint that is to be deleted at the next stop. */
2963 breakpoint_auto_delete (stop_bpstat);
2965 /* If an auto-display called a function and that got a signal,
2966 delete that auto-display to avoid an infinite recursion. */
2968 if (stopped_by_random_signal)
2969 disable_current_display ();
2971 /* Don't print a message if in the middle of doing a "step n"
2972 operation for n > 1 */
2973 if (step_multi && stop_step)
2976 target_terminal_ours ();
2978 /* Look up the hook_stop and run it (CLI internally handles problem
2979 of stop_command's pre-hook not existing). */
2981 catch_errors (hook_stop_stub, stop_command,
2982 "Error while running hook_stop:\n", RETURN_MASK_ALL);
2984 if (!target_has_stack)
2990 /* Select innermost stack frame - i.e., current frame is frame 0,
2991 and current location is based on that.
2992 Don't do this on return from a stack dummy routine,
2993 or if the program has exited. */
2995 if (!stop_stack_dummy)
2997 select_frame (get_current_frame ());
2999 /* Print current location without a level number, if
3000 we have changed functions or hit a breakpoint.
3001 Print source line if we have one.
3002 bpstat_print() contains the logic deciding in detail
3003 what to print, based on the event(s) that just occurred. */
3005 if (stop_print_frame && deprecated_selected_frame)
3009 int do_frame_printing = 1;
3011 bpstat_ret = bpstat_print (stop_bpstat);
3015 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3016 (or should) carry around the function and does (or
3017 should) use that when doing a frame comparison. */
3019 && frame_id_eq (step_frame_id,
3020 get_frame_id (get_current_frame ()))
3021 && step_start_function == find_pc_function (stop_pc))
3022 source_flag = SRC_LINE; /* finished step, just print source line */
3024 source_flag = SRC_AND_LOC; /* print location and source line */
3026 case PRINT_SRC_AND_LOC:
3027 source_flag = SRC_AND_LOC; /* print location and source line */
3029 case PRINT_SRC_ONLY:
3030 source_flag = SRC_LINE;
3033 source_flag = SRC_LINE; /* something bogus */
3034 do_frame_printing = 0;
3037 internal_error (__FILE__, __LINE__, "Unknown value.");
3039 /* For mi, have the same behavior every time we stop:
3040 print everything but the source line. */
3041 if (ui_out_is_mi_like_p (uiout))
3042 source_flag = LOC_AND_ADDRESS;
3044 if (ui_out_is_mi_like_p (uiout))
3045 ui_out_field_int (uiout, "thread-id",
3046 pid_to_thread_id (inferior_ptid));
3047 /* The behavior of this routine with respect to the source
3049 SRC_LINE: Print only source line
3050 LOCATION: Print only location
3051 SRC_AND_LOC: Print location and source line */
3052 if (do_frame_printing)
3053 print_stack_frame (deprecated_selected_frame, -1, source_flag);
3055 /* Display the auto-display expressions. */
3060 /* Save the function value return registers, if we care.
3061 We might be about to restore their previous contents. */
3062 if (proceed_to_finish)
3063 /* NB: The copy goes through to the target picking up the value of
3064 all the registers. */
3065 regcache_cpy (stop_registers, current_regcache);
3067 if (stop_stack_dummy)
3069 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3070 ends with a setting of the current frame, so we can use that
3072 frame_pop (get_current_frame ());
3073 /* Set stop_pc to what it was before we called the function.
3074 Can't rely on restore_inferior_status because that only gets
3075 called if we don't stop in the called function. */
3076 stop_pc = read_pc ();
3077 select_frame (get_current_frame ());
3081 annotate_stopped ();
3082 observer_notify_normal_stop ();
3086 hook_stop_stub (void *cmd)
3088 execute_cmd_pre_hook ((struct cmd_list_element *) cmd);
3093 signal_stop_state (int signo)
3095 return signal_stop[signo];
3099 signal_print_state (int signo)
3101 return signal_print[signo];
3105 signal_pass_state (int signo)
3107 return signal_program[signo];
3111 signal_stop_update (int signo, int state)
3113 int ret = signal_stop[signo];
3114 signal_stop[signo] = state;
3119 signal_print_update (int signo, int state)
3121 int ret = signal_print[signo];
3122 signal_print[signo] = state;
3127 signal_pass_update (int signo, int state)
3129 int ret = signal_program[signo];
3130 signal_program[signo] = state;
3135 sig_print_header (void)
3138 Signal Stop\tPrint\tPass to program\tDescription\n");
3142 sig_print_info (enum target_signal oursig)
3144 char *name = target_signal_to_name (oursig);
3145 int name_padding = 13 - strlen (name);
3147 if (name_padding <= 0)
3150 printf_filtered ("%s", name);
3151 printf_filtered ("%*.*s ", name_padding, name_padding, " ");
3152 printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No");
3153 printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No");
3154 printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No");
3155 printf_filtered ("%s\n", target_signal_to_string (oursig));
3158 /* Specify how various signals in the inferior should be handled. */
3161 handle_command (char *args, int from_tty)
3164 int digits, wordlen;
3165 int sigfirst, signum, siglast;
3166 enum target_signal oursig;
3169 unsigned char *sigs;
3170 struct cleanup *old_chain;
3174 error_no_arg ("signal to handle");
3177 /* Allocate and zero an array of flags for which signals to handle. */
3179 nsigs = (int) TARGET_SIGNAL_LAST;
3180 sigs = (unsigned char *) alloca (nsigs);
3181 memset (sigs, 0, nsigs);
3183 /* Break the command line up into args. */
3185 argv = buildargv (args);
3190 old_chain = make_cleanup_freeargv (argv);
3192 /* Walk through the args, looking for signal oursigs, signal names, and
3193 actions. Signal numbers and signal names may be interspersed with
3194 actions, with the actions being performed for all signals cumulatively
3195 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3197 while (*argv != NULL)
3199 wordlen = strlen (*argv);
3200 for (digits = 0; isdigit ((*argv)[digits]); digits++)
3204 sigfirst = siglast = -1;
3206 if (wordlen >= 1 && !strncmp (*argv, "all", wordlen))
3208 /* Apply action to all signals except those used by the
3209 debugger. Silently skip those. */
3212 siglast = nsigs - 1;
3214 else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen))
3216 SET_SIGS (nsigs, sigs, signal_stop);
3217 SET_SIGS (nsigs, sigs, signal_print);
3219 else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen))
3221 UNSET_SIGS (nsigs, sigs, signal_program);
3223 else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen))
3225 SET_SIGS (nsigs, sigs, signal_print);
3227 else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen))
3229 SET_SIGS (nsigs, sigs, signal_program);
3231 else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen))
3233 UNSET_SIGS (nsigs, sigs, signal_stop);
3235 else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen))
3237 SET_SIGS (nsigs, sigs, signal_program);
3239 else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen))
3241 UNSET_SIGS (nsigs, sigs, signal_print);
3242 UNSET_SIGS (nsigs, sigs, signal_stop);
3244 else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen))
3246 UNSET_SIGS (nsigs, sigs, signal_program);
3248 else if (digits > 0)
3250 /* It is numeric. The numeric signal refers to our own
3251 internal signal numbering from target.h, not to host/target
3252 signal number. This is a feature; users really should be
3253 using symbolic names anyway, and the common ones like
3254 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3256 sigfirst = siglast = (int)
3257 target_signal_from_command (atoi (*argv));
3258 if ((*argv)[digits] == '-')
3261 target_signal_from_command (atoi ((*argv) + digits + 1));
3263 if (sigfirst > siglast)
3265 /* Bet he didn't figure we'd think of this case... */
3273 oursig = target_signal_from_name (*argv);
3274 if (oursig != TARGET_SIGNAL_UNKNOWN)
3276 sigfirst = siglast = (int) oursig;
3280 /* Not a number and not a recognized flag word => complain. */
3281 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv);
3285 /* If any signal numbers or symbol names were found, set flags for
3286 which signals to apply actions to. */
3288 for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++)
3290 switch ((enum target_signal) signum)
3292 case TARGET_SIGNAL_TRAP:
3293 case TARGET_SIGNAL_INT:
3294 if (!allsigs && !sigs[signum])
3296 if (query ("%s is used by the debugger.\n\
3297 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum)))
3303 printf_unfiltered ("Not confirmed, unchanged.\n");
3304 gdb_flush (gdb_stdout);
3308 case TARGET_SIGNAL_0:
3309 case TARGET_SIGNAL_DEFAULT:
3310 case TARGET_SIGNAL_UNKNOWN:
3311 /* Make sure that "all" doesn't print these. */
3322 target_notice_signals (inferior_ptid);
3326 /* Show the results. */
3327 sig_print_header ();
3328 for (signum = 0; signum < nsigs; signum++)
3332 sig_print_info (signum);
3337 do_cleanups (old_chain);
3341 xdb_handle_command (char *args, int from_tty)
3344 struct cleanup *old_chain;
3346 /* Break the command line up into args. */
3348 argv = buildargv (args);
3353 old_chain = make_cleanup_freeargv (argv);
3354 if (argv[1] != (char *) NULL)
3359 bufLen = strlen (argv[0]) + 20;
3360 argBuf = (char *) xmalloc (bufLen);
3364 enum target_signal oursig;
3366 oursig = target_signal_from_name (argv[0]);
3367 memset (argBuf, 0, bufLen);
3368 if (strcmp (argv[1], "Q") == 0)
3369 sprintf (argBuf, "%s %s", argv[0], "noprint");
3372 if (strcmp (argv[1], "s") == 0)
3374 if (!signal_stop[oursig])
3375 sprintf (argBuf, "%s %s", argv[0], "stop");
3377 sprintf (argBuf, "%s %s", argv[0], "nostop");
3379 else if (strcmp (argv[1], "i") == 0)
3381 if (!signal_program[oursig])
3382 sprintf (argBuf, "%s %s", argv[0], "pass");
3384 sprintf (argBuf, "%s %s", argv[0], "nopass");
3386 else if (strcmp (argv[1], "r") == 0)
3388 if (!signal_print[oursig])
3389 sprintf (argBuf, "%s %s", argv[0], "print");
3391 sprintf (argBuf, "%s %s", argv[0], "noprint");
3397 handle_command (argBuf, from_tty);
3399 printf_filtered ("Invalid signal handling flag.\n");
3404 do_cleanups (old_chain);
3407 /* Print current contents of the tables set by the handle command.
3408 It is possible we should just be printing signals actually used
3409 by the current target (but for things to work right when switching
3410 targets, all signals should be in the signal tables). */
3413 signals_info (char *signum_exp, int from_tty)
3415 enum target_signal oursig;
3416 sig_print_header ();
3420 /* First see if this is a symbol name. */
3421 oursig = target_signal_from_name (signum_exp);
3422 if (oursig == TARGET_SIGNAL_UNKNOWN)
3424 /* No, try numeric. */
3426 target_signal_from_command (parse_and_eval_long (signum_exp));
3428 sig_print_info (oursig);
3432 printf_filtered ("\n");
3433 /* These ugly casts brought to you by the native VAX compiler. */
3434 for (oursig = TARGET_SIGNAL_FIRST;
3435 (int) oursig < (int) TARGET_SIGNAL_LAST;
3436 oursig = (enum target_signal) ((int) oursig + 1))
3440 if (oursig != TARGET_SIGNAL_UNKNOWN
3441 && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0)
3442 sig_print_info (oursig);
3445 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
3448 struct inferior_status
3450 enum target_signal stop_signal;
3454 int stop_stack_dummy;
3455 int stopped_by_random_signal;
3457 CORE_ADDR step_range_start;
3458 CORE_ADDR step_range_end;
3459 struct frame_id step_frame_id;
3460 enum step_over_calls_kind step_over_calls;
3461 CORE_ADDR step_resume_break_address;
3462 int stop_after_trap;
3463 int stop_soon_quietly;
3464 struct regcache *stop_registers;
3466 /* These are here because if call_function_by_hand has written some
3467 registers and then decides to call error(), we better not have changed
3469 struct regcache *registers;
3471 /* A frame unique identifier. */
3472 struct frame_id selected_frame_id;
3474 int breakpoint_proceeded;
3475 int restore_stack_info;
3476 int proceed_to_finish;
3480 write_inferior_status_register (struct inferior_status *inf_status, int regno,
3483 int size = REGISTER_RAW_SIZE (regno);
3484 void *buf = alloca (size);
3485 store_signed_integer (buf, size, val);
3486 regcache_raw_write (inf_status->registers, regno, buf);
3489 /* Save all of the information associated with the inferior<==>gdb
3490 connection. INF_STATUS is a pointer to a "struct inferior_status"
3491 (defined in inferior.h). */
3493 struct inferior_status *
3494 save_inferior_status (int restore_stack_info)
3496 struct inferior_status *inf_status = XMALLOC (struct inferior_status);
3498 inf_status->stop_signal = stop_signal;
3499 inf_status->stop_pc = stop_pc;
3500 inf_status->stop_step = stop_step;
3501 inf_status->stop_stack_dummy = stop_stack_dummy;
3502 inf_status->stopped_by_random_signal = stopped_by_random_signal;
3503 inf_status->trap_expected = trap_expected;
3504 inf_status->step_range_start = step_range_start;
3505 inf_status->step_range_end = step_range_end;
3506 inf_status->step_frame_id = step_frame_id;
3507 inf_status->step_over_calls = step_over_calls;
3508 inf_status->stop_after_trap = stop_after_trap;
3509 inf_status->stop_soon_quietly = stop_soon_quietly;
3510 /* Save original bpstat chain here; replace it with copy of chain.
3511 If caller's caller is walking the chain, they'll be happier if we
3512 hand them back the original chain when restore_inferior_status is
3514 inf_status->stop_bpstat = stop_bpstat;
3515 stop_bpstat = bpstat_copy (stop_bpstat);
3516 inf_status->breakpoint_proceeded = breakpoint_proceeded;
3517 inf_status->restore_stack_info = restore_stack_info;
3518 inf_status->proceed_to_finish = proceed_to_finish;
3520 inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers);
3522 inf_status->registers = regcache_dup (current_regcache);
3524 inf_status->selected_frame_id = get_frame_id (deprecated_selected_frame);
3529 restore_selected_frame (void *args)
3531 struct frame_id *fid = (struct frame_id *) args;
3532 struct frame_info *frame;
3534 frame = frame_find_by_id (*fid);
3536 /* If inf_status->selected_frame_id is NULL, there was no previously
3540 warning ("Unable to restore previously selected frame.\n");
3544 select_frame (frame);
3550 restore_inferior_status (struct inferior_status *inf_status)
3552 stop_signal = inf_status->stop_signal;
3553 stop_pc = inf_status->stop_pc;
3554 stop_step = inf_status->stop_step;
3555 stop_stack_dummy = inf_status->stop_stack_dummy;
3556 stopped_by_random_signal = inf_status->stopped_by_random_signal;
3557 trap_expected = inf_status->trap_expected;
3558 step_range_start = inf_status->step_range_start;
3559 step_range_end = inf_status->step_range_end;
3560 step_frame_id = inf_status->step_frame_id;
3561 step_over_calls = inf_status->step_over_calls;
3562 stop_after_trap = inf_status->stop_after_trap;
3563 stop_soon_quietly = inf_status->stop_soon_quietly;
3564 bpstat_clear (&stop_bpstat);
3565 stop_bpstat = inf_status->stop_bpstat;
3566 breakpoint_proceeded = inf_status->breakpoint_proceeded;
3567 proceed_to_finish = inf_status->proceed_to_finish;
3569 /* FIXME: Is the restore of stop_registers always needed. */
3570 regcache_xfree (stop_registers);
3571 stop_registers = inf_status->stop_registers;
3573 /* The inferior can be gone if the user types "print exit(0)"
3574 (and perhaps other times). */
3575 if (target_has_execution)
3576 /* NB: The register write goes through to the target. */
3577 regcache_cpy (current_regcache, inf_status->registers);
3578 regcache_xfree (inf_status->registers);
3580 /* FIXME: If we are being called after stopping in a function which
3581 is called from gdb, we should not be trying to restore the
3582 selected frame; it just prints a spurious error message (The
3583 message is useful, however, in detecting bugs in gdb (like if gdb
3584 clobbers the stack)). In fact, should we be restoring the
3585 inferior status at all in that case? . */
3587 if (target_has_stack && inf_status->restore_stack_info)
3589 /* The point of catch_errors is that if the stack is clobbered,
3590 walking the stack might encounter a garbage pointer and
3591 error() trying to dereference it. */
3593 (restore_selected_frame, &inf_status->selected_frame_id,
3594 "Unable to restore previously selected frame:\n",
3595 RETURN_MASK_ERROR) == 0)
3596 /* Error in restoring the selected frame. Select the innermost
3598 select_frame (get_current_frame ());
3606 do_restore_inferior_status_cleanup (void *sts)
3608 restore_inferior_status (sts);
3612 make_cleanup_restore_inferior_status (struct inferior_status *inf_status)
3614 return make_cleanup (do_restore_inferior_status_cleanup, inf_status);
3618 discard_inferior_status (struct inferior_status *inf_status)
3620 /* See save_inferior_status for info on stop_bpstat. */
3621 bpstat_clear (&inf_status->stop_bpstat);
3622 regcache_xfree (inf_status->registers);
3623 regcache_xfree (inf_status->stop_registers);
3628 inferior_has_forked (int pid, int *child_pid)
3630 struct target_waitstatus last;
3633 get_last_target_status (&last_ptid, &last);
3635 if (last.kind != TARGET_WAITKIND_FORKED)
3638 if (ptid_get_pid (last_ptid) != pid)
3641 *child_pid = last.value.related_pid;
3646 inferior_has_vforked (int pid, int *child_pid)
3648 struct target_waitstatus last;
3651 get_last_target_status (&last_ptid, &last);
3653 if (last.kind != TARGET_WAITKIND_VFORKED)
3656 if (ptid_get_pid (last_ptid) != pid)
3659 *child_pid = last.value.related_pid;
3664 inferior_has_execd (int pid, char **execd_pathname)
3666 struct target_waitstatus last;
3669 get_last_target_status (&last_ptid, &last);
3671 if (last.kind != TARGET_WAITKIND_EXECD)
3674 if (ptid_get_pid (last_ptid) != pid)
3677 *execd_pathname = xstrdup (last.value.execd_pathname);
3681 /* Oft used ptids */
3683 ptid_t minus_one_ptid;
3685 /* Create a ptid given the necessary PID, LWP, and TID components. */
3688 ptid_build (int pid, long lwp, long tid)
3698 /* Create a ptid from just a pid. */
3701 pid_to_ptid (int pid)
3703 return ptid_build (pid, 0, 0);
3706 /* Fetch the pid (process id) component from a ptid. */
3709 ptid_get_pid (ptid_t ptid)
3714 /* Fetch the lwp (lightweight process) component from a ptid. */
3717 ptid_get_lwp (ptid_t ptid)
3722 /* Fetch the tid (thread id) component from a ptid. */
3725 ptid_get_tid (ptid_t ptid)
3730 /* ptid_equal() is used to test equality of two ptids. */
3733 ptid_equal (ptid_t ptid1, ptid_t ptid2)
3735 return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp
3736 && ptid1.tid == ptid2.tid);
3739 /* restore_inferior_ptid() will be used by the cleanup machinery
3740 to restore the inferior_ptid value saved in a call to
3741 save_inferior_ptid(). */
3744 restore_inferior_ptid (void *arg)
3746 ptid_t *saved_ptid_ptr = arg;
3747 inferior_ptid = *saved_ptid_ptr;
3751 /* Save the value of inferior_ptid so that it may be restored by a
3752 later call to do_cleanups(). Returns the struct cleanup pointer
3753 needed for later doing the cleanup. */
3756 save_inferior_ptid (void)
3758 ptid_t *saved_ptid_ptr;
3760 saved_ptid_ptr = xmalloc (sizeof (ptid_t));
3761 *saved_ptid_ptr = inferior_ptid;
3762 return make_cleanup (restore_inferior_ptid, saved_ptid_ptr);
3769 stop_registers = regcache_xmalloc (current_gdbarch);
3773 _initialize_infrun (void)
3776 register int numsigs;
3777 struct cmd_list_element *c;
3779 register_gdbarch_swap (&stop_registers, sizeof (stop_registers), NULL);
3780 register_gdbarch_swap (NULL, 0, build_infrun);
3782 add_info ("signals", signals_info,
3783 "What debugger does when program gets various signals.\n\
3784 Specify a signal as argument to print info on that signal only.");
3785 add_info_alias ("handle", "signals", 0);
3787 add_com ("handle", class_run, handle_command,
3788 concat ("Specify how to handle a signal.\n\
3789 Args are signals and actions to apply to those signals.\n\
3790 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3791 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3792 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3793 The special arg \"all\" is recognized to mean all signals except those\n\
3794 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3795 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3796 Stop means reenter debugger if this signal happens (implies print).\n\
3797 Print means print a message if this signal happens.\n\
3798 Pass means let program see this signal; otherwise program doesn't know.\n\
3799 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3800 Pass and Stop may be combined.", NULL));
3803 add_com ("lz", class_info, signals_info,
3804 "What debugger does when program gets various signals.\n\
3805 Specify a signal as argument to print info on that signal only.");
3806 add_com ("z", class_run, xdb_handle_command,
3807 concat ("Specify how to handle a signal.\n\
3808 Args are signals and actions to apply to those signals.\n\
3809 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3810 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3811 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3812 The special arg \"all\" is recognized to mean all signals except those\n\
3813 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\
3814 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
3815 nopass), \"Q\" (noprint)\n\
3816 Stop means reenter debugger if this signal happens (implies print).\n\
3817 Print means print a message if this signal happens.\n\
3818 Pass means let program see this signal; otherwise program doesn't know.\n\
3819 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3820 Pass and Stop may be combined.", NULL));
3825 add_cmd ("stop", class_obscure, not_just_help_class_command, "There is no `stop' command, but you can set a hook on `stop'.\n\
3826 This allows you to set a list of commands to be run each time execution\n\
3827 of the program stops.", &cmdlist);
3829 numsigs = (int) TARGET_SIGNAL_LAST;
3830 signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs);
3831 signal_print = (unsigned char *)
3832 xmalloc (sizeof (signal_print[0]) * numsigs);
3833 signal_program = (unsigned char *)
3834 xmalloc (sizeof (signal_program[0]) * numsigs);
3835 for (i = 0; i < numsigs; i++)
3838 signal_print[i] = 1;
3839 signal_program[i] = 1;
3842 /* Signals caused by debugger's own actions
3843 should not be given to the program afterwards. */
3844 signal_program[TARGET_SIGNAL_TRAP] = 0;
3845 signal_program[TARGET_SIGNAL_INT] = 0;
3847 /* Signals that are not errors should not normally enter the debugger. */
3848 signal_stop[TARGET_SIGNAL_ALRM] = 0;
3849 signal_print[TARGET_SIGNAL_ALRM] = 0;
3850 signal_stop[TARGET_SIGNAL_VTALRM] = 0;
3851 signal_print[TARGET_SIGNAL_VTALRM] = 0;
3852 signal_stop[TARGET_SIGNAL_PROF] = 0;
3853 signal_print[TARGET_SIGNAL_PROF] = 0;
3854 signal_stop[TARGET_SIGNAL_CHLD] = 0;
3855 signal_print[TARGET_SIGNAL_CHLD] = 0;
3856 signal_stop[TARGET_SIGNAL_IO] = 0;
3857 signal_print[TARGET_SIGNAL_IO] = 0;
3858 signal_stop[TARGET_SIGNAL_POLL] = 0;
3859 signal_print[TARGET_SIGNAL_POLL] = 0;
3860 signal_stop[TARGET_SIGNAL_URG] = 0;
3861 signal_print[TARGET_SIGNAL_URG] = 0;
3862 signal_stop[TARGET_SIGNAL_WINCH] = 0;
3863 signal_print[TARGET_SIGNAL_WINCH] = 0;
3865 /* These signals are used internally by user-level thread
3866 implementations. (See signal(5) on Solaris.) Like the above
3867 signals, a healthy program receives and handles them as part of
3868 its normal operation. */
3869 signal_stop[TARGET_SIGNAL_LWP] = 0;
3870 signal_print[TARGET_SIGNAL_LWP] = 0;
3871 signal_stop[TARGET_SIGNAL_WAITING] = 0;
3872 signal_print[TARGET_SIGNAL_WAITING] = 0;
3873 signal_stop[TARGET_SIGNAL_CANCEL] = 0;
3874 signal_print[TARGET_SIGNAL_CANCEL] = 0;
3878 (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger,
3879 (char *) &stop_on_solib_events,
3880 "Set stopping for shared library events.\n\
3881 If nonzero, gdb will give control to the user when the dynamic linker\n\
3882 notifies gdb of shared library events. The most common event of interest\n\
3883 to the user would be loading/unloading of a new library.\n", &setlist), &showlist);
3886 c = add_set_enum_cmd ("follow-fork-mode",
3888 follow_fork_mode_kind_names, &follow_fork_mode_string,
3889 /* ??rehrauer: The "both" option is broken, by what may be a 10.20
3890 kernel problem. It's also not terribly useful without a GUI to
3891 help the user drive two debuggers. So for now, I'm disabling
3892 the "both" option. */
3893 /* "Set debugger response to a program call of fork \
3895 A fork or vfork creates a new process. follow-fork-mode can be:\n\
3896 parent - the original process is debugged after a fork\n\
3897 child - the new process is debugged after a fork\n\
3898 both - both the parent and child are debugged after a fork\n\
3899 ask - the debugger will ask for one of the above choices\n\
3900 For \"both\", another copy of the debugger will be started to follow\n\
3901 the new child process. The original debugger will continue to follow\n\
3902 the original parent process. To distinguish their prompts, the\n\
3903 debugger copy's prompt will be changed.\n\
3904 For \"parent\" or \"child\", the unfollowed process will run free.\n\
3905 By default, the debugger will follow the parent process.",
3907 "Set debugger response to a program call of fork \
3909 A fork or vfork creates a new process. follow-fork-mode can be:\n\
3910 parent - the original process is debugged after a fork\n\
3911 child - the new process is debugged after a fork\n\
3912 ask - the debugger will ask for one of the above choices\n\
3913 For \"parent\" or \"child\", the unfollowed process will run free.\n\
3914 By default, the debugger will follow the parent process.", &setlist);
3915 add_show_from_set (c, &showlist);
3917 c = add_set_enum_cmd ("scheduler-locking", class_run, scheduler_enums, /* array of string names */
3918 &scheduler_mode, /* current mode */
3919 "Set mode for locking scheduler during execution.\n\
3920 off == no locking (threads may preempt at any time)\n\
3921 on == full locking (no thread except the current thread may run)\n\
3922 step == scheduler locked during every single-step operation.\n\
3923 In this mode, no other thread may run during a step command.\n\
3924 Other threads may run while stepping over a function call ('next').", &setlist);
3926 set_cmd_sfunc (c, set_schedlock_func); /* traps on target vector */
3927 add_show_from_set (c, &showlist);
3929 c = add_set_cmd ("step-mode", class_run,
3930 var_boolean, (char *) &step_stop_if_no_debug,
3931 "Set mode of the step operation. When set, doing a step over a\n\
3932 function without debug line information will stop at the first\n\
3933 instruction of that function. Otherwise, the function is skipped and\n\
3934 the step command stops at a different source line.", &setlist);
3935 add_show_from_set (c, &showlist);
3937 /* ptid initializations */
3938 null_ptid = ptid_build (0, 0, 0);
3939 minus_one_ptid = ptid_build (-1, 0, 0);
3940 inferior_ptid = null_ptid;
3941 target_last_wait_ptid = minus_one_ptid;