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 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"
46 /* Prototypes for local functions */
48 static void signals_info (char *, int);
50 static void handle_command (char *, int);
52 static void sig_print_info (enum target_signal);
54 static void sig_print_header (void);
56 static void resume_cleanups (void *);
58 static int hook_stop_stub (void *);
60 static void delete_breakpoint_current_contents (void *);
62 static void set_follow_fork_mode_command (char *arg, int from_tty,
63 struct cmd_list_element *c);
65 static int restore_selected_frame (void *);
67 static void build_infrun (void);
69 static int follow_fork ();
71 static void set_schedlock_func (char *args, int from_tty,
72 struct cmd_list_element *c);
74 struct execution_control_state;
76 static int currently_stepping (struct execution_control_state *ecs);
78 static void xdb_handle_command (char *args, int from_tty);
80 void _initialize_infrun (void);
82 int inferior_ignoring_startup_exec_events = 0;
83 int inferior_ignoring_leading_exec_events = 0;
85 /* When set, stop the 'step' command if we enter a function which has
86 no line number information. The normal behavior is that we step
87 over such function. */
88 int step_stop_if_no_debug = 0;
90 /* In asynchronous mode, but simulating synchronous execution. */
92 int sync_execution = 0;
94 /* wait_for_inferior and normal_stop use this to notify the user
95 when the inferior stopped in a different thread than it had been
98 static ptid_t previous_inferior_ptid;
100 /* This is true for configurations that may follow through execl() and
101 similar functions. At present this is only true for HP-UX native. */
103 #ifndef MAY_FOLLOW_EXEC
104 #define MAY_FOLLOW_EXEC (0)
107 static int may_follow_exec = MAY_FOLLOW_EXEC;
109 /* Dynamic function trampolines are similar to solib trampolines in that they
110 are between the caller and the callee. The difference is that when you
111 enter a dynamic trampoline, you can't determine the callee's address. Some
112 (usually complex) code needs to run in the dynamic trampoline to figure out
113 the callee's address. This macro is usually called twice. First, when we
114 enter the trampoline (looks like a normal function call at that point). It
115 should return the PC of a point within the trampoline where the callee's
116 address is known. Second, when we hit the breakpoint, this routine returns
117 the callee's address. At that point, things proceed as per a step resume
120 #ifndef DYNAMIC_TRAMPOLINE_NEXTPC
121 #define DYNAMIC_TRAMPOLINE_NEXTPC(pc) 0
124 /* If the program uses ELF-style shared libraries, then calls to
125 functions in shared libraries go through stubs, which live in a
126 table called the PLT (Procedure Linkage Table). The first time the
127 function is called, the stub sends control to the dynamic linker,
128 which looks up the function's real address, patches the stub so
129 that future calls will go directly to the function, and then passes
130 control to the function.
132 If we are stepping at the source level, we don't want to see any of
133 this --- we just want to skip over the stub and the dynamic linker.
134 The simple approach is to single-step until control leaves the
137 However, on some systems (e.g., Red Hat's 5.2 distribution) the
138 dynamic linker calls functions in the shared C library, so you
139 can't tell from the PC alone whether the dynamic linker is still
140 running. In this case, we use a step-resume breakpoint to get us
141 past the dynamic linker, as if we were using "next" to step over a
144 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
145 linker code or not. Normally, this means we single-step. However,
146 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
147 address where we can place a step-resume breakpoint to get past the
148 linker's symbol resolution function.
150 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
151 pretty portable way, by comparing the PC against the address ranges
152 of the dynamic linker's sections.
154 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
155 it depends on internal details of the dynamic linker. It's usually
156 not too hard to figure out where to put a breakpoint, but it
157 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
158 sanity checking. If it can't figure things out, returning zero and
159 getting the (possibly confusing) stepping behavior is better than
160 signalling an error, which will obscure the change in the
163 #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE
164 #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0
167 #ifndef SKIP_SOLIB_RESOLVER
168 #define SKIP_SOLIB_RESOLVER(pc) 0
171 /* This function returns TRUE if pc is the address of an instruction
172 that lies within the dynamic linker (such as the event hook, or the
175 This function must be used only when a dynamic linker event has
176 been caught, and the inferior is being stepped out of the hook, or
177 undefined results are guaranteed. */
179 #ifndef SOLIB_IN_DYNAMIC_LINKER
180 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
183 /* On MIPS16, a function that returns a floating point value may call
184 a library helper function to copy the return value to a floating point
185 register. The IGNORE_HELPER_CALL macro returns non-zero if we
186 should ignore (i.e. step over) this function call. */
187 #ifndef IGNORE_HELPER_CALL
188 #define IGNORE_HELPER_CALL(pc) 0
191 /* On some systems, the PC may be left pointing at an instruction that won't
192 actually be executed. This is usually indicated by a bit in the PSW. If
193 we find ourselves in such a state, then we step the target beyond the
194 nullified instruction before returning control to the user so as to avoid
197 #ifndef INSTRUCTION_NULLIFIED
198 #define INSTRUCTION_NULLIFIED 0
201 /* We can't step off a permanent breakpoint in the ordinary way, because we
202 can't remove it. Instead, we have to advance the PC to the next
203 instruction. This macro should expand to a pointer to a function that
204 does that, or zero if we have no such function. If we don't have a
205 definition for it, we have to report an error. */
206 #ifndef SKIP_PERMANENT_BREAKPOINT
207 #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint)
209 default_skip_permanent_breakpoint (void)
212 The program is stopped at a permanent breakpoint, but GDB does not know\n\
213 how to step past a permanent breakpoint on this architecture. Try using\n\
214 a command like `return' or `jump' to continue execution.");
219 /* Convert the #defines into values. This is temporary until wfi control
220 flow is completely sorted out. */
222 #ifndef HAVE_STEPPABLE_WATCHPOINT
223 #define HAVE_STEPPABLE_WATCHPOINT 0
225 #undef HAVE_STEPPABLE_WATCHPOINT
226 #define HAVE_STEPPABLE_WATCHPOINT 1
229 #ifndef HAVE_CONTINUABLE_WATCHPOINT
230 #define HAVE_CONTINUABLE_WATCHPOINT 0
232 #undef HAVE_CONTINUABLE_WATCHPOINT
233 #define HAVE_CONTINUABLE_WATCHPOINT 1
236 #ifndef CANNOT_STEP_HW_WATCHPOINTS
237 #define CANNOT_STEP_HW_WATCHPOINTS 0
239 #undef CANNOT_STEP_HW_WATCHPOINTS
240 #define CANNOT_STEP_HW_WATCHPOINTS 1
243 /* Tables of how to react to signals; the user sets them. */
245 static unsigned char *signal_stop;
246 static unsigned char *signal_print;
247 static unsigned char *signal_program;
249 #define SET_SIGS(nsigs,sigs,flags) \
251 int signum = (nsigs); \
252 while (signum-- > 0) \
253 if ((sigs)[signum]) \
254 (flags)[signum] = 1; \
257 #define UNSET_SIGS(nsigs,sigs,flags) \
259 int signum = (nsigs); \
260 while (signum-- > 0) \
261 if ((sigs)[signum]) \
262 (flags)[signum] = 0; \
265 /* Value to pass to target_resume() to cause all threads to resume */
267 #define RESUME_ALL (pid_to_ptid (-1))
269 /* Command list pointer for the "stop" placeholder. */
271 static struct cmd_list_element *stop_command;
273 /* Nonzero if breakpoints are now inserted in the inferior. */
275 static int breakpoints_inserted;
277 /* Function inferior was in as of last step command. */
279 static struct symbol *step_start_function;
281 /* Nonzero if we are expecting a trace trap and should proceed from it. */
283 static int trap_expected;
286 /* Nonzero if we want to give control to the user when we're notified
287 of shared library events by the dynamic linker. */
288 static int stop_on_solib_events;
292 /* Nonzero if the next time we try to continue the inferior, it will
293 step one instruction and generate a spurious trace trap.
294 This is used to compensate for a bug in HP-UX. */
296 static int trap_expected_after_continue;
299 /* Nonzero means expecting a trace trap
300 and should stop the inferior and return silently when it happens. */
304 /* Nonzero means expecting a trap and caller will handle it themselves.
305 It is used after attach, due to attaching to a process;
306 when running in the shell before the child program has been exec'd;
307 and when running some kinds of remote stuff (FIXME?). */
309 int stop_soon_quietly;
311 /* Nonzero if proceed is being used for a "finish" command or a similar
312 situation when stop_registers should be saved. */
314 int proceed_to_finish;
316 /* Save register contents here when about to pop a stack dummy frame,
317 if-and-only-if proceed_to_finish is set.
318 Thus this contains the return value from the called function (assuming
319 values are returned in a register). */
321 struct regcache *stop_registers;
323 /* Nonzero if program stopped due to error trying to insert breakpoints. */
325 static int breakpoints_failed;
327 /* Nonzero after stop if current stack frame should be printed. */
329 static int stop_print_frame;
331 static struct breakpoint *step_resume_breakpoint = NULL;
332 static struct breakpoint *through_sigtramp_breakpoint = NULL;
334 /* On some platforms (e.g., HP-UX), hardware watchpoints have bad
335 interactions with an inferior that is running a kernel function
336 (aka, a system call or "syscall"). wait_for_inferior therefore
337 may have a need to know when the inferior is in a syscall. This
338 is a count of the number of inferior threads which are known to
339 currently be running in a syscall. */
340 static int number_of_threads_in_syscalls;
342 /* This is a cached copy of the pid/waitstatus of the last event
343 returned by target_wait()/target_wait_hook(). This information is
344 returned by get_last_target_status(). */
345 static ptid_t target_last_wait_ptid;
346 static struct target_waitstatus target_last_waitstatus;
348 /* This is used to remember when a fork, vfork or exec event
349 was caught by a catchpoint, and thus the event is to be
350 followed at the next resume of the inferior, and not
354 enum target_waitkind kind;
364 char *execd_pathname;
368 static const char follow_fork_mode_ask[] = "ask";
369 static const char follow_fork_mode_child[] = "child";
370 static const char follow_fork_mode_parent[] = "parent";
372 static const char *follow_fork_mode_kind_names[] = {
373 follow_fork_mode_ask,
374 follow_fork_mode_child,
375 follow_fork_mode_parent,
379 static const char *follow_fork_mode_string = follow_fork_mode_parent;
385 const char *follow_mode = follow_fork_mode_string;
386 int follow_child = (follow_mode == follow_fork_mode_child);
388 /* Or, did the user not know, and want us to ask? */
389 if (follow_fork_mode_string == follow_fork_mode_ask)
391 internal_error (__FILE__, __LINE__,
392 "follow_inferior_fork: \"ask\" mode not implemented");
393 /* follow_mode = follow_fork_mode_...; */
396 pending_follow.fork_event.saw_parent_fork = 0;
397 pending_follow.fork_event.saw_child_fork = 0;
399 return target_follow_fork (follow_child);
403 follow_inferior_reset_breakpoints (void)
405 /* Was there a step_resume breakpoint? (There was if the user
406 did a "next" at the fork() call.) If so, explicitly reset its
409 step_resumes are a form of bp that are made to be per-thread.
410 Since we created the step_resume bp when the parent process
411 was being debugged, and now are switching to the child process,
412 from the breakpoint package's viewpoint, that's a switch of
413 "threads". We must update the bp's notion of which thread
414 it is for, or it'll be ignored when it triggers. */
416 if (step_resume_breakpoint)
417 breakpoint_re_set_thread (step_resume_breakpoint);
419 /* Reinsert all breakpoints in the child. The user may have set
420 breakpoints after catching the fork, in which case those
421 were never set in the child, but only in the parent. This makes
422 sure the inserted breakpoints match the breakpoint list. */
424 breakpoint_re_set ();
425 insert_breakpoints ();
428 /* EXECD_PATHNAME is assumed to be non-NULL. */
431 follow_exec (int pid, char *execd_pathname)
434 struct target_ops *tgt;
436 if (!may_follow_exec)
439 /* This is an exec event that we actually wish to pay attention to.
440 Refresh our symbol table to the newly exec'd program, remove any
443 If there are breakpoints, they aren't really inserted now,
444 since the exec() transformed our inferior into a fresh set
447 We want to preserve symbolic breakpoints on the list, since
448 we have hopes that they can be reset after the new a.out's
449 symbol table is read.
451 However, any "raw" breakpoints must be removed from the list
452 (e.g., the solib bp's), since their address is probably invalid
455 And, we DON'T want to call delete_breakpoints() here, since
456 that may write the bp's "shadow contents" (the instruction
457 value that was overwritten witha TRAP instruction). Since
458 we now have a new a.out, those shadow contents aren't valid. */
459 update_breakpoints_after_exec ();
461 /* If there was one, it's gone now. We cannot truly step-to-next
462 statement through an exec(). */
463 step_resume_breakpoint = NULL;
464 step_range_start = 0;
467 /* If there was one, it's gone now. */
468 through_sigtramp_breakpoint = NULL;
470 /* What is this a.out's name? */
471 printf_unfiltered ("Executing new program: %s\n", execd_pathname);
473 /* We've followed the inferior through an exec. Therefore, the
474 inferior has essentially been killed & reborn. */
476 /* First collect the run target in effect. */
477 tgt = find_run_target ();
478 /* If we can't find one, things are in a very strange state... */
480 error ("Could find run target to save before following exec");
482 gdb_flush (gdb_stdout);
483 target_mourn_inferior ();
484 inferior_ptid = pid_to_ptid (saved_pid);
485 /* Because mourn_inferior resets inferior_ptid. */
488 /* That a.out is now the one to use. */
489 exec_file_attach (execd_pathname, 0);
491 /* And also is where symbols can be found. */
492 symbol_file_add_main (execd_pathname, 0);
494 /* Reset the shared library package. This ensures that we get
495 a shlib event when the child reaches "_start", at which point
496 the dld will have had a chance to initialize the child. */
497 #if defined(SOLIB_RESTART)
500 #ifdef SOLIB_CREATE_INFERIOR_HOOK
501 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid));
504 /* Reinsert all breakpoints. (Those which were symbolic have
505 been reset to the proper address in the new a.out, thanks
506 to symbol_file_command...) */
507 insert_breakpoints ();
509 /* The next resume of this inferior should bring it to the shlib
510 startup breakpoints. (If the user had also set bp's on
511 "main" from the old (parent) process, then they'll auto-
512 matically get reset there in the new process.) */
515 /* Non-zero if we just simulating a single-step. This is needed
516 because we cannot remove the breakpoints in the inferior process
517 until after the `wait' in `wait_for_inferior'. */
518 static int singlestep_breakpoints_inserted_p = 0;
521 /* Things to clean up if we QUIT out of resume (). */
524 resume_cleanups (void *ignore)
529 static const char schedlock_off[] = "off";
530 static const char schedlock_on[] = "on";
531 static const char schedlock_step[] = "step";
532 static const char *scheduler_mode = schedlock_off;
533 static const char *scheduler_enums[] = {
541 set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c)
543 /* NOTE: cagney/2002-03-17: The add_show_from_set() function clones
544 the set command passed as a parameter. The clone operation will
545 include (BUG?) any ``set'' command callback, if present.
546 Commands like ``info set'' call all the ``show'' command
547 callbacks. Unfortunatly, for ``show'' commands cloned from
548 ``set'', this includes callbacks belonging to ``set'' commands.
549 Making this worse, this only occures if add_show_from_set() is
550 called after add_cmd_sfunc() (BUG?). */
551 if (cmd_type (c) == set_cmd)
552 if (!target_can_lock_scheduler)
554 scheduler_mode = schedlock_off;
555 error ("Target '%s' cannot support this command.", target_shortname);
560 /* Resume the inferior, but allow a QUIT. This is useful if the user
561 wants to interrupt some lengthy single-stepping operation
562 (for child processes, the SIGINT goes to the inferior, and so
563 we get a SIGINT random_signal, but for remote debugging and perhaps
564 other targets, that's not true).
566 STEP nonzero if we should step (zero to continue instead).
567 SIG is the signal to give the inferior (zero for none). */
569 resume (int step, enum target_signal sig)
571 int should_resume = 1;
572 struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0);
575 /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */
578 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
579 over an instruction that causes a page fault without triggering
580 a hardware watchpoint. The kernel properly notices that it shouldn't
581 stop, because the hardware watchpoint is not triggered, but it forgets
582 the step request and continues the program normally.
583 Work around the problem by removing hardware watchpoints if a step is
584 requested, GDB will check for a hardware watchpoint trigger after the
586 if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted)
587 remove_hw_watchpoints ();
590 /* Normally, by the time we reach `resume', the breakpoints are either
591 removed or inserted, as appropriate. The exception is if we're sitting
592 at a permanent breakpoint; we need to step over it, but permanent
593 breakpoints can't be removed. So we have to test for it here. */
594 if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here)
595 SKIP_PERMANENT_BREAKPOINT ();
597 if (SOFTWARE_SINGLE_STEP_P () && step)
599 /* Do it the hard way, w/temp breakpoints */
600 SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ );
601 /* ...and don't ask hardware to do it. */
603 /* and do not pull these breakpoints until after a `wait' in
604 `wait_for_inferior' */
605 singlestep_breakpoints_inserted_p = 1;
608 /* Handle any optimized stores to the inferior NOW... */
609 #ifdef DO_DEFERRED_STORES
613 /* If there were any forks/vforks/execs that were caught and are
614 now to be followed, then do so. */
615 switch (pending_follow.kind)
617 case TARGET_WAITKIND_FORKED:
618 case TARGET_WAITKIND_VFORKED:
619 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
624 case TARGET_WAITKIND_EXECD:
625 /* follow_exec is called as soon as the exec event is seen. */
626 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
633 /* Install inferior's terminal modes. */
634 target_terminal_inferior ();
640 resume_ptid = RESUME_ALL; /* Default */
642 if ((step || singlestep_breakpoints_inserted_p) &&
643 !breakpoints_inserted && breakpoint_here_p (read_pc ()))
645 /* Stepping past a breakpoint without inserting breakpoints.
646 Make sure only the current thread gets to step, so that
647 other threads don't sneak past breakpoints while they are
650 resume_ptid = inferior_ptid;
653 if ((scheduler_mode == schedlock_on) ||
654 (scheduler_mode == schedlock_step &&
655 (step || singlestep_breakpoints_inserted_p)))
657 /* User-settable 'scheduler' mode requires solo thread resume. */
658 resume_ptid = inferior_ptid;
661 if (CANNOT_STEP_BREAKPOINT)
663 /* Most targets can step a breakpoint instruction, thus
664 executing it normally. But if this one cannot, just
665 continue and we will hit it anyway. */
666 if (step && breakpoints_inserted && breakpoint_here_p (read_pc ()))
669 target_resume (resume_ptid, step, sig);
672 discard_cleanups (old_cleanups);
676 /* Clear out all variables saying what to do when inferior is continued.
677 First do this, then set the ones you want, then call `proceed'. */
680 clear_proceed_status (void)
683 step_range_start = 0;
685 step_frame_id = null_frame_id;
686 step_over_calls = STEP_OVER_UNDEBUGGABLE;
688 stop_soon_quietly = 0;
689 proceed_to_finish = 0;
690 breakpoint_proceeded = 1; /* We're about to proceed... */
692 /* Discard any remaining commands or status from previous stop. */
693 bpstat_clear (&stop_bpstat);
696 /* Basic routine for continuing the program in various fashions.
698 ADDR is the address to resume at, or -1 for resume where stopped.
699 SIGGNAL is the signal to give it, or 0 for none,
700 or -1 for act according to how it stopped.
701 STEP is nonzero if should trap after one instruction.
702 -1 means return after that and print nothing.
703 You should probably set various step_... variables
704 before calling here, if you are stepping.
706 You should call clear_proceed_status before calling proceed. */
709 proceed (CORE_ADDR addr, enum target_signal siggnal, int step)
714 step_start_function = find_pc_function (read_pc ());
718 if (addr == (CORE_ADDR) -1)
720 /* If there is a breakpoint at the address we will resume at,
721 step one instruction before inserting breakpoints
722 so that we do not stop right away (and report a second
723 hit at this breakpoint). */
725 if (read_pc () == stop_pc && breakpoint_here_p (read_pc ()))
728 #ifndef STEP_SKIPS_DELAY
729 #define STEP_SKIPS_DELAY(pc) (0)
730 #define STEP_SKIPS_DELAY_P (0)
732 /* Check breakpoint_here_p first, because breakpoint_here_p is fast
733 (it just checks internal GDB data structures) and STEP_SKIPS_DELAY
734 is slow (it needs to read memory from the target). */
735 if (STEP_SKIPS_DELAY_P
736 && breakpoint_here_p (read_pc () + 4)
737 && STEP_SKIPS_DELAY (read_pc ()))
745 #ifdef PREPARE_TO_PROCEED
746 /* In a multi-threaded task we may select another thread
747 and then continue or step.
749 But if the old thread was stopped at a breakpoint, it
750 will immediately cause another breakpoint stop without
751 any execution (i.e. it will report a breakpoint hit
752 incorrectly). So we must step over it first.
754 PREPARE_TO_PROCEED checks the current thread against the thread
755 that reported the most recent event. If a step-over is required
756 it returns TRUE and sets the current thread to the old thread. */
757 if (PREPARE_TO_PROCEED (1) && breakpoint_here_p (read_pc ()))
762 #endif /* PREPARE_TO_PROCEED */
765 if (trap_expected_after_continue)
767 /* If (step == 0), a trap will be automatically generated after
768 the first instruction is executed. Force step one
769 instruction to clear this condition. This should not occur
770 if step is nonzero, but it is harmless in that case. */
772 trap_expected_after_continue = 0;
774 #endif /* HP_OS_BUG */
777 /* We will get a trace trap after one instruction.
778 Continue it automatically and insert breakpoints then. */
782 insert_breakpoints ();
783 /* If we get here there was no call to error() in
784 insert breakpoints -- so they were inserted. */
785 breakpoints_inserted = 1;
788 if (siggnal != TARGET_SIGNAL_DEFAULT)
789 stop_signal = siggnal;
790 /* If this signal should not be seen by program,
791 give it zero. Used for debugging signals. */
792 else if (!signal_program[stop_signal])
793 stop_signal = TARGET_SIGNAL_0;
795 annotate_starting ();
797 /* Make sure that output from GDB appears before output from the
799 gdb_flush (gdb_stdout);
801 /* Resume inferior. */
802 resume (oneproc || step || bpstat_should_step (), stop_signal);
804 /* Wait for it to stop (if not standalone)
805 and in any case decode why it stopped, and act accordingly. */
806 /* Do this only if we are not using the event loop, or if the target
807 does not support asynchronous execution. */
808 if (!event_loop_p || !target_can_async_p ())
810 wait_for_inferior ();
815 /* Record the pc and sp of the program the last time it stopped.
816 These are just used internally by wait_for_inferior, but need
817 to be preserved over calls to it and cleared when the inferior
819 static CORE_ADDR prev_pc;
820 static CORE_ADDR prev_func_start;
821 static char *prev_func_name;
824 /* Start remote-debugging of a machine over a serial link. */
830 init_wait_for_inferior ();
831 stop_soon_quietly = 1;
834 /* Always go on waiting for the target, regardless of the mode. */
835 /* FIXME: cagney/1999-09-23: At present it isn't possible to
836 indicate to wait_for_inferior that a target should timeout if
837 nothing is returned (instead of just blocking). Because of this,
838 targets expecting an immediate response need to, internally, set
839 things up so that the target_wait() is forced to eventually
841 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
842 differentiate to its caller what the state of the target is after
843 the initial open has been performed. Here we're assuming that
844 the target has stopped. It should be possible to eventually have
845 target_open() return to the caller an indication that the target
846 is currently running and GDB state should be set to the same as
848 wait_for_inferior ();
852 /* Initialize static vars when a new inferior begins. */
855 init_wait_for_inferior (void)
857 /* These are meaningless until the first time through wait_for_inferior. */
860 prev_func_name = NULL;
863 trap_expected_after_continue = 0;
865 breakpoints_inserted = 0;
866 breakpoint_init_inferior (inf_starting);
868 /* Don't confuse first call to proceed(). */
869 stop_signal = TARGET_SIGNAL_0;
871 /* The first resume is not following a fork/vfork/exec. */
872 pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */
873 pending_follow.fork_event.saw_parent_fork = 0;
874 pending_follow.fork_event.saw_child_fork = 0;
875 pending_follow.fork_event.saw_child_exec = 0;
877 /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */
878 number_of_threads_in_syscalls = 0;
880 clear_proceed_status ();
884 delete_breakpoint_current_contents (void *arg)
886 struct breakpoint **breakpointp = (struct breakpoint **) arg;
887 if (*breakpointp != NULL)
889 delete_breakpoint (*breakpointp);
894 /* This enum encodes possible reasons for doing a target_wait, so that
895 wfi can call target_wait in one place. (Ultimately the call will be
896 moved out of the infinite loop entirely.) */
900 infwait_normal_state,
901 infwait_thread_hop_state,
902 infwait_nullified_state,
903 infwait_nonstep_watch_state
906 /* Why did the inferior stop? Used to print the appropriate messages
907 to the interface from within handle_inferior_event(). */
908 enum inferior_stop_reason
910 /* We don't know why. */
912 /* Step, next, nexti, stepi finished. */
914 /* Found breakpoint. */
916 /* Inferior terminated by signal. */
918 /* Inferior exited. */
920 /* Inferior received signal, and user asked to be notified. */
924 /* This structure contains what used to be local variables in
925 wait_for_inferior. Probably many of them can return to being
926 locals in handle_inferior_event. */
928 struct execution_control_state
930 struct target_waitstatus ws;
931 struct target_waitstatus *wp;
934 CORE_ADDR stop_func_start;
935 CORE_ADDR stop_func_end;
936 char *stop_func_name;
937 struct symtab_and_line sal;
938 int remove_breakpoints_on_following_step;
940 struct symtab *current_symtab;
941 int handling_longjmp; /* FIXME */
943 ptid_t saved_inferior_ptid;
945 int stepping_through_solib_after_catch;
946 bpstat stepping_through_solib_catchpoints;
947 int enable_hw_watchpoints_after_wait;
948 int stepping_through_sigtramp;
949 int new_thread_event;
950 struct target_waitstatus tmpstatus;
951 enum infwait_states infwait_state;
956 void init_execution_control_state (struct execution_control_state *ecs);
958 void handle_inferior_event (struct execution_control_state *ecs);
960 static void check_sigtramp2 (struct execution_control_state *ecs);
961 static void step_into_function (struct execution_control_state *ecs);
962 static void step_over_function (struct execution_control_state *ecs);
963 static void stop_stepping (struct execution_control_state *ecs);
964 static void prepare_to_wait (struct execution_control_state *ecs);
965 static void keep_going (struct execution_control_state *ecs);
966 static void print_stop_reason (enum inferior_stop_reason stop_reason,
969 /* Wait for control to return from inferior to debugger.
970 If inferior gets a signal, we may decide to start it up again
971 instead of returning. That is why there is a loop in this function.
972 When this function actually returns it means the inferior
973 should be left stopped and GDB should read more commands. */
976 wait_for_inferior (void)
978 struct cleanup *old_cleanups;
979 struct execution_control_state ecss;
980 struct execution_control_state *ecs;
982 old_cleanups = make_cleanup (delete_step_resume_breakpoint,
983 &step_resume_breakpoint);
984 make_cleanup (delete_breakpoint_current_contents,
985 &through_sigtramp_breakpoint);
987 /* wfi still stays in a loop, so it's OK just to take the address of
988 a local to get the ecs pointer. */
991 /* Fill in with reasonable starting values. */
992 init_execution_control_state (ecs);
994 /* We'll update this if & when we switch to a new thread. */
995 previous_inferior_ptid = inferior_ptid;
997 overlay_cache_invalid = 1;
999 /* We have to invalidate the registers BEFORE calling target_wait
1000 because they can be loaded from the target while in target_wait.
1001 This makes remote debugging a bit more efficient for those
1002 targets that provide critical registers as part of their normal
1003 status mechanism. */
1005 registers_changed ();
1009 if (target_wait_hook)
1010 ecs->ptid = target_wait_hook (ecs->waiton_ptid, ecs->wp);
1012 ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp);
1014 /* Now figure out what to do with the result of the result. */
1015 handle_inferior_event (ecs);
1017 if (!ecs->wait_some_more)
1020 do_cleanups (old_cleanups);
1023 /* Asynchronous version of wait_for_inferior. It is called by the
1024 event loop whenever a change of state is detected on the file
1025 descriptor corresponding to the target. It can be called more than
1026 once to complete a single execution command. In such cases we need
1027 to keep the state in a global variable ASYNC_ECSS. If it is the
1028 last time that this function is called for a single execution
1029 command, then report to the user that the inferior has stopped, and
1030 do the necessary cleanups. */
1032 struct execution_control_state async_ecss;
1033 struct execution_control_state *async_ecs;
1036 fetch_inferior_event (void *client_data)
1038 static struct cleanup *old_cleanups;
1040 async_ecs = &async_ecss;
1042 if (!async_ecs->wait_some_more)
1044 old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint,
1045 &step_resume_breakpoint);
1046 make_exec_cleanup (delete_breakpoint_current_contents,
1047 &through_sigtramp_breakpoint);
1049 /* Fill in with reasonable starting values. */
1050 init_execution_control_state (async_ecs);
1052 /* We'll update this if & when we switch to a new thread. */
1053 previous_inferior_ptid = inferior_ptid;
1055 overlay_cache_invalid = 1;
1057 /* We have to invalidate the registers BEFORE calling target_wait
1058 because they can be loaded from the target while in target_wait.
1059 This makes remote debugging a bit more efficient for those
1060 targets that provide critical registers as part of their normal
1061 status mechanism. */
1063 registers_changed ();
1066 if (target_wait_hook)
1068 target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp);
1070 async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp);
1072 /* Now figure out what to do with the result of the result. */
1073 handle_inferior_event (async_ecs);
1075 if (!async_ecs->wait_some_more)
1077 /* Do only the cleanups that have been added by this
1078 function. Let the continuations for the commands do the rest,
1079 if there are any. */
1080 do_exec_cleanups (old_cleanups);
1082 if (step_multi && stop_step)
1083 inferior_event_handler (INF_EXEC_CONTINUE, NULL);
1085 inferior_event_handler (INF_EXEC_COMPLETE, NULL);
1089 /* Prepare an execution control state for looping through a
1090 wait_for_inferior-type loop. */
1093 init_execution_control_state (struct execution_control_state *ecs)
1095 /* ecs->another_trap? */
1096 ecs->random_signal = 0;
1097 ecs->remove_breakpoints_on_following_step = 0;
1098 ecs->handling_longjmp = 0; /* FIXME */
1099 ecs->update_step_sp = 0;
1100 ecs->stepping_through_solib_after_catch = 0;
1101 ecs->stepping_through_solib_catchpoints = NULL;
1102 ecs->enable_hw_watchpoints_after_wait = 0;
1103 ecs->stepping_through_sigtramp = 0;
1104 ecs->sal = find_pc_line (prev_pc, 0);
1105 ecs->current_line = ecs->sal.line;
1106 ecs->current_symtab = ecs->sal.symtab;
1107 ecs->infwait_state = infwait_normal_state;
1108 ecs->waiton_ptid = pid_to_ptid (-1);
1109 ecs->wp = &(ecs->ws);
1112 /* Call this function before setting step_resume_breakpoint, as a
1113 sanity check. There should never be more than one step-resume
1114 breakpoint per thread, so we should never be setting a new
1115 step_resume_breakpoint when one is already active. */
1117 check_for_old_step_resume_breakpoint (void)
1119 if (step_resume_breakpoint)
1121 ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint");
1124 /* Return the cached copy of the last pid/waitstatus returned by
1125 target_wait()/target_wait_hook(). The data is actually cached by
1126 handle_inferior_event(), which gets called immediately after
1127 target_wait()/target_wait_hook(). */
1130 get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status)
1132 *ptidp = target_last_wait_ptid;
1133 *status = target_last_waitstatus;
1136 /* Switch thread contexts, maintaining "infrun state". */
1139 context_switch (struct execution_control_state *ecs)
1141 /* Caution: it may happen that the new thread (or the old one!)
1142 is not in the thread list. In this case we must not attempt
1143 to "switch context", or we run the risk that our context may
1144 be lost. This may happen as a result of the target module
1145 mishandling thread creation. */
1147 if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid))
1148 { /* Perform infrun state context switch: */
1149 /* Save infrun state for the old thread. */
1150 save_infrun_state (inferior_ptid, prev_pc,
1151 prev_func_start, prev_func_name,
1152 trap_expected, step_resume_breakpoint,
1153 through_sigtramp_breakpoint, step_range_start,
1154 step_range_end, &step_frame_id,
1155 ecs->handling_longjmp, ecs->another_trap,
1156 ecs->stepping_through_solib_after_catch,
1157 ecs->stepping_through_solib_catchpoints,
1158 ecs->stepping_through_sigtramp,
1159 ecs->current_line, ecs->current_symtab, step_sp);
1161 /* Load infrun state for the new thread. */
1162 load_infrun_state (ecs->ptid, &prev_pc,
1163 &prev_func_start, &prev_func_name,
1164 &trap_expected, &step_resume_breakpoint,
1165 &through_sigtramp_breakpoint, &step_range_start,
1166 &step_range_end, &step_frame_id,
1167 &ecs->handling_longjmp, &ecs->another_trap,
1168 &ecs->stepping_through_solib_after_catch,
1169 &ecs->stepping_through_solib_catchpoints,
1170 &ecs->stepping_through_sigtramp,
1171 &ecs->current_line, &ecs->current_symtab, &step_sp);
1173 inferior_ptid = ecs->ptid;
1177 /* Given an execution control state that has been freshly filled in
1178 by an event from the inferior, figure out what it means and take
1179 appropriate action. */
1182 handle_inferior_event (struct execution_control_state *ecs)
1185 int stepped_after_stopped_by_watchpoint;
1186 int sw_single_step_trap_p = 0;
1188 /* Cache the last pid/waitstatus. */
1189 target_last_wait_ptid = ecs->ptid;
1190 target_last_waitstatus = *ecs->wp;
1192 switch (ecs->infwait_state)
1194 case infwait_thread_hop_state:
1195 /* Cancel the waiton_ptid. */
1196 ecs->waiton_ptid = pid_to_ptid (-1);
1197 /* Fall thru to the normal_state case. */
1199 case infwait_normal_state:
1200 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1201 is serviced in this loop, below. */
1202 if (ecs->enable_hw_watchpoints_after_wait)
1204 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid));
1205 ecs->enable_hw_watchpoints_after_wait = 0;
1207 stepped_after_stopped_by_watchpoint = 0;
1210 case infwait_nullified_state:
1213 case infwait_nonstep_watch_state:
1214 insert_breakpoints ();
1216 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1217 handle things like signals arriving and other things happening
1218 in combination correctly? */
1219 stepped_after_stopped_by_watchpoint = 1;
1222 ecs->infwait_state = infwait_normal_state;
1224 flush_cached_frames ();
1226 /* If it's a new process, add it to the thread database */
1228 ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid)
1229 && !in_thread_list (ecs->ptid));
1231 if (ecs->ws.kind != TARGET_WAITKIND_EXITED
1232 && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event)
1234 add_thread (ecs->ptid);
1236 ui_out_text (uiout, "[New ");
1237 ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid));
1238 ui_out_text (uiout, "]\n");
1241 /* NOTE: This block is ONLY meant to be invoked in case of a
1242 "thread creation event"! If it is invoked for any other
1243 sort of event (such as a new thread landing on a breakpoint),
1244 the event will be discarded, which is almost certainly
1247 To avoid this, the low-level module (eg. target_wait)
1248 should call in_thread_list and add_thread, so that the
1249 new thread is known by the time we get here. */
1251 /* We may want to consider not doing a resume here in order
1252 to give the user a chance to play with the new thread.
1253 It might be good to make that a user-settable option. */
1255 /* At this point, all threads are stopped (happens
1256 automatically in either the OS or the native code).
1257 Therefore we need to continue all threads in order to
1260 target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0);
1261 prepare_to_wait (ecs);
1266 switch (ecs->ws.kind)
1268 case TARGET_WAITKIND_LOADED:
1269 /* Ignore gracefully during startup of the inferior, as it
1270 might be the shell which has just loaded some objects,
1271 otherwise add the symbols for the newly loaded objects. */
1273 if (!stop_soon_quietly)
1275 /* Remove breakpoints, SOLIB_ADD might adjust
1276 breakpoint addresses via breakpoint_re_set. */
1277 if (breakpoints_inserted)
1278 remove_breakpoints ();
1280 /* Check for any newly added shared libraries if we're
1281 supposed to be adding them automatically. Switch
1282 terminal for any messages produced by
1283 breakpoint_re_set. */
1284 target_terminal_ours_for_output ();
1285 SOLIB_ADD (NULL, 0, NULL, auto_solib_add);
1286 target_terminal_inferior ();
1288 /* Reinsert breakpoints and continue. */
1289 if (breakpoints_inserted)
1290 insert_breakpoints ();
1293 resume (0, TARGET_SIGNAL_0);
1294 prepare_to_wait (ecs);
1297 case TARGET_WAITKIND_SPURIOUS:
1298 resume (0, TARGET_SIGNAL_0);
1299 prepare_to_wait (ecs);
1302 case TARGET_WAITKIND_EXITED:
1303 target_terminal_ours (); /* Must do this before mourn anyway */
1304 print_stop_reason (EXITED, ecs->ws.value.integer);
1306 /* Record the exit code in the convenience variable $_exitcode, so
1307 that the user can inspect this again later. */
1308 set_internalvar (lookup_internalvar ("_exitcode"),
1309 value_from_longest (builtin_type_int,
1310 (LONGEST) ecs->ws.value.integer));
1311 gdb_flush (gdb_stdout);
1312 target_mourn_inferior ();
1313 singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */
1314 stop_print_frame = 0;
1315 stop_stepping (ecs);
1318 case TARGET_WAITKIND_SIGNALLED:
1319 stop_print_frame = 0;
1320 stop_signal = ecs->ws.value.sig;
1321 target_terminal_ours (); /* Must do this before mourn anyway */
1323 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1324 reach here unless the inferior is dead. However, for years
1325 target_kill() was called here, which hints that fatal signals aren't
1326 really fatal on some systems. If that's true, then some changes
1328 target_mourn_inferior ();
1330 print_stop_reason (SIGNAL_EXITED, stop_signal);
1331 singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */
1332 stop_stepping (ecs);
1335 /* The following are the only cases in which we keep going;
1336 the above cases end in a continue or goto. */
1337 case TARGET_WAITKIND_FORKED:
1338 stop_signal = TARGET_SIGNAL_TRAP;
1339 pending_follow.kind = ecs->ws.kind;
1341 pending_follow.fork_event.saw_child_fork = 1;
1342 pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid);
1343 pending_follow.fork_event.child_pid = ecs->ws.value.related_pid;
1345 stop_pc = read_pc_pid (ecs->ptid);
1346 ecs->saved_inferior_ptid = inferior_ptid;
1347 inferior_ptid = ecs->ptid;
1348 /* The second argument of bpstat_stop_status is meant to help
1349 distinguish between a breakpoint trap and a singlestep trap.
1350 This is only important on targets where DECR_PC_AFTER_BREAK
1351 is non-zero. The prev_pc test is meant to distinguish between
1352 singlestepping a trap instruction, and singlestepping thru a
1353 jump to the instruction following a trap instruction. */
1355 stop_bpstat = bpstat_stop_status (&stop_pc,
1356 currently_stepping (ecs) &&
1358 stop_pc - DECR_PC_AFTER_BREAK);
1359 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1360 inferior_ptid = ecs->saved_inferior_ptid;
1361 goto process_event_stop_test;
1363 /* If this a platform which doesn't allow a debugger to touch a
1364 vfork'd inferior until after it exec's, then we'd best keep
1365 our fingers entirely off the inferior, other than continuing
1366 it. This has the unfortunate side-effect that catchpoints
1367 of vforks will be ignored. But since the platform doesn't
1368 allow the inferior be touched at vfork time, there's really
1370 case TARGET_WAITKIND_VFORKED:
1371 stop_signal = TARGET_SIGNAL_TRAP;
1372 pending_follow.kind = ecs->ws.kind;
1374 /* Is this a vfork of the parent? If so, then give any
1375 vfork catchpoints a chance to trigger now. (It's
1376 dangerous to do so if the child canot be touched until
1377 it execs, and the child has not yet exec'd. We probably
1378 should warn the user to that effect when the catchpoint
1380 if (ptid_equal (ecs->ptid, inferior_ptid))
1382 pending_follow.fork_event.saw_parent_fork = 1;
1383 pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid);
1384 pending_follow.fork_event.child_pid = ecs->ws.value.related_pid;
1387 /* If we've seen the child's vfork event but cannot really touch
1388 the child until it execs, then we must continue the child now.
1389 Else, give any vfork catchpoints a chance to trigger now. */
1392 pending_follow.fork_event.saw_child_fork = 1;
1393 pending_follow.fork_event.child_pid = PIDGET (ecs->ptid);
1394 pending_follow.fork_event.parent_pid = ecs->ws.value.related_pid;
1395 target_post_startup_inferior (pid_to_ptid
1396 (pending_follow.fork_event.
1400 stop_pc = read_pc ();
1401 /* The second argument of bpstat_stop_status is meant to help
1402 distinguish between a breakpoint trap and a singlestep trap.
1403 This is only important on targets where DECR_PC_AFTER_BREAK
1404 is non-zero. The prev_pc test is meant to distinguish between
1405 singlestepping a trap instruction, and singlestepping thru a
1406 jump to the instruction following a trap instruction. */
1408 stop_bpstat = bpstat_stop_status (&stop_pc,
1409 currently_stepping (ecs) &&
1411 stop_pc - DECR_PC_AFTER_BREAK);
1412 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1413 goto process_event_stop_test;
1415 case TARGET_WAITKIND_EXECD:
1416 stop_signal = TARGET_SIGNAL_TRAP;
1418 /* NOTE drow/2002-12-05: This code should be pushed down into the
1419 target_wait function. Until then following vfork on HP/UX 10.20
1420 is probably broken by this. Of course, it's broken anyway. */
1421 /* Is this a target which reports multiple exec events per actual
1422 call to exec()? (HP-UX using ptrace does, for example.) If so,
1423 ignore all but the last one. Just resume the exec'r, and wait
1424 for the next exec event. */
1425 if (inferior_ignoring_leading_exec_events)
1427 inferior_ignoring_leading_exec_events--;
1428 if (pending_follow.kind == TARGET_WAITKIND_VFORKED)
1429 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event.
1431 target_resume (ecs->ptid, 0, TARGET_SIGNAL_0);
1432 prepare_to_wait (ecs);
1435 inferior_ignoring_leading_exec_events =
1436 target_reported_exec_events_per_exec_call () - 1;
1438 pending_follow.execd_pathname =
1439 savestring (ecs->ws.value.execd_pathname,
1440 strlen (ecs->ws.value.execd_pathname));
1442 /* This causes the eventpoints and symbol table to be reset. Must
1443 do this now, before trying to determine whether to stop. */
1444 follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname);
1445 xfree (pending_follow.execd_pathname);
1447 stop_pc = read_pc_pid (ecs->ptid);
1448 ecs->saved_inferior_ptid = inferior_ptid;
1449 inferior_ptid = ecs->ptid;
1450 /* The second argument of bpstat_stop_status is meant to help
1451 distinguish between a breakpoint trap and a singlestep trap.
1452 This is only important on targets where DECR_PC_AFTER_BREAK
1453 is non-zero. The prev_pc test is meant to distinguish between
1454 singlestepping a trap instruction, and singlestepping thru a
1455 jump to the instruction following a trap instruction. */
1457 stop_bpstat = bpstat_stop_status (&stop_pc,
1458 currently_stepping (ecs) &&
1460 stop_pc - DECR_PC_AFTER_BREAK);
1461 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1462 inferior_ptid = ecs->saved_inferior_ptid;
1463 goto process_event_stop_test;
1465 /* These syscall events are returned on HP-UX, as part of its
1466 implementation of page-protection-based "hardware" watchpoints.
1467 HP-UX has unfortunate interactions between page-protections and
1468 some system calls. Our solution is to disable hardware watches
1469 when a system call is entered, and reenable them when the syscall
1470 completes. The downside of this is that we may miss the precise
1471 point at which a watched piece of memory is modified. "Oh well."
1473 Note that we may have multiple threads running, which may each
1474 enter syscalls at roughly the same time. Since we don't have a
1475 good notion currently of whether a watched piece of memory is
1476 thread-private, we'd best not have any page-protections active
1477 when any thread is in a syscall. Thus, we only want to reenable
1478 hardware watches when no threads are in a syscall.
1480 Also, be careful not to try to gather much state about a thread
1481 that's in a syscall. It's frequently a losing proposition. */
1482 case TARGET_WAITKIND_SYSCALL_ENTRY:
1483 number_of_threads_in_syscalls++;
1484 if (number_of_threads_in_syscalls == 1)
1486 TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid));
1488 resume (0, TARGET_SIGNAL_0);
1489 prepare_to_wait (ecs);
1492 /* Before examining the threads further, step this thread to
1493 get it entirely out of the syscall. (We get notice of the
1494 event when the thread is just on the verge of exiting a
1495 syscall. Stepping one instruction seems to get it back
1498 Note that although the logical place to reenable h/w watches
1499 is here, we cannot. We cannot reenable them before stepping
1500 the thread (this causes the next wait on the thread to hang).
1502 Nor can we enable them after stepping until we've done a wait.
1503 Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait
1504 here, which will be serviced immediately after the target
1506 case TARGET_WAITKIND_SYSCALL_RETURN:
1507 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0);
1509 if (number_of_threads_in_syscalls > 0)
1511 number_of_threads_in_syscalls--;
1512 ecs->enable_hw_watchpoints_after_wait =
1513 (number_of_threads_in_syscalls == 0);
1515 prepare_to_wait (ecs);
1518 case TARGET_WAITKIND_STOPPED:
1519 stop_signal = ecs->ws.value.sig;
1522 /* We had an event in the inferior, but we are not interested
1523 in handling it at this level. The lower layers have already
1524 done what needs to be done, if anything.
1526 One of the possible circumstances for this is when the
1527 inferior produces output for the console. The inferior has
1528 not stopped, and we are ignoring the event. Another possible
1529 circumstance is any event which the lower level knows will be
1530 reported multiple times without an intervening resume. */
1531 case TARGET_WAITKIND_IGNORE:
1532 prepare_to_wait (ecs);
1536 /* We may want to consider not doing a resume here in order to give
1537 the user a chance to play with the new thread. It might be good
1538 to make that a user-settable option. */
1540 /* At this point, all threads are stopped (happens automatically in
1541 either the OS or the native code). Therefore we need to continue
1542 all threads in order to make progress. */
1543 if (ecs->new_thread_event)
1545 target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0);
1546 prepare_to_wait (ecs);
1550 stop_pc = read_pc_pid (ecs->ptid);
1552 /* See if a thread hit a thread-specific breakpoint that was meant for
1553 another thread. If so, then step that thread past the breakpoint,
1556 if (stop_signal == TARGET_SIGNAL_TRAP)
1558 /* Check if a regular breakpoint has been hit before checking
1559 for a potential single step breakpoint. Otherwise, GDB will
1560 not see this breakpoint hit when stepping onto breakpoints. */
1561 if (breakpoints_inserted
1562 && breakpoint_here_p (stop_pc - DECR_PC_AFTER_BREAK))
1564 ecs->random_signal = 0;
1565 if (!breakpoint_thread_match (stop_pc - DECR_PC_AFTER_BREAK,
1570 /* Saw a breakpoint, but it was hit by the wrong thread.
1572 if (DECR_PC_AFTER_BREAK)
1573 write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK, ecs->ptid);
1575 remove_status = remove_breakpoints ();
1576 /* Did we fail to remove breakpoints? If so, try
1577 to set the PC past the bp. (There's at least
1578 one situation in which we can fail to remove
1579 the bp's: On HP-UX's that use ttrace, we can't
1580 change the address space of a vforking child
1581 process until the child exits (well, okay, not
1582 then either :-) or execs. */
1583 if (remove_status != 0)
1585 /* FIXME! This is obviously non-portable! */
1586 write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK + 4, ecs->ptid);
1587 /* We need to restart all the threads now,
1588 * unles we're running in scheduler-locked mode.
1589 * Use currently_stepping to determine whether to
1592 /* FIXME MVS: is there any reason not to call resume()? */
1593 if (scheduler_mode == schedlock_on)
1594 target_resume (ecs->ptid,
1595 currently_stepping (ecs), TARGET_SIGNAL_0);
1597 target_resume (RESUME_ALL,
1598 currently_stepping (ecs), TARGET_SIGNAL_0);
1599 prepare_to_wait (ecs);
1604 breakpoints_inserted = 0;
1605 if (!ptid_equal (inferior_ptid, ecs->ptid))
1606 context_switch (ecs);
1607 ecs->waiton_ptid = ecs->ptid;
1608 ecs->wp = &(ecs->ws);
1609 ecs->another_trap = 1;
1611 ecs->infwait_state = infwait_thread_hop_state;
1613 registers_changed ();
1618 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1620 /* Readjust the stop_pc as it is off by DECR_PC_AFTER_BREAK
1621 compared to the value it would have if the system stepping
1622 capability was used. This allows the rest of the code in
1623 this function to use this address without having to worry
1624 whether software single step is in use or not. */
1625 if (DECR_PC_AFTER_BREAK)
1627 stop_pc -= DECR_PC_AFTER_BREAK;
1628 write_pc_pid (stop_pc, ecs->ptid);
1631 sw_single_step_trap_p = 1;
1632 ecs->random_signal = 0;
1636 ecs->random_signal = 1;
1638 /* See if something interesting happened to the non-current thread. If
1639 so, then switch to that thread, and eventually give control back to
1642 Note that if there's any kind of pending follow (i.e., of a fork,
1643 vfork or exec), we don't want to do this now. Rather, we'll let
1644 the next resume handle it. */
1645 if (!ptid_equal (ecs->ptid, inferior_ptid) &&
1646 (pending_follow.kind == TARGET_WAITKIND_SPURIOUS))
1650 /* If it's a random signal for a non-current thread, notify user
1651 if he's expressed an interest. */
1652 if (ecs->random_signal && signal_print[stop_signal])
1654 /* ??rehrauer: I don't understand the rationale for this code. If the
1655 inferior will stop as a result of this signal, then the act of handling
1656 the stop ought to print a message that's couches the stoppage in user
1657 terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior
1658 won't stop as a result of the signal -- i.e., if the signal is merely
1659 a side-effect of something GDB's doing "under the covers" for the
1660 user, such as stepping threads over a breakpoint they shouldn't stop
1661 for -- then the message seems to be a serious annoyance at best.
1663 For now, remove the message altogether. */
1666 target_terminal_ours_for_output ();
1667 printf_filtered ("\nProgram received signal %s, %s.\n",
1668 target_signal_to_name (stop_signal),
1669 target_signal_to_string (stop_signal));
1670 gdb_flush (gdb_stdout);
1674 /* If it's not SIGTRAP and not a signal we want to stop for, then
1675 continue the thread. */
1677 if (stop_signal != TARGET_SIGNAL_TRAP && !signal_stop[stop_signal])
1680 target_terminal_inferior ();
1682 /* Clear the signal if it should not be passed. */
1683 if (signal_program[stop_signal] == 0)
1684 stop_signal = TARGET_SIGNAL_0;
1686 target_resume (ecs->ptid, 0, stop_signal);
1687 prepare_to_wait (ecs);
1691 /* It's a SIGTRAP or a signal we're interested in. Switch threads,
1692 and fall into the rest of wait_for_inferior(). */
1694 context_switch (ecs);
1697 context_hook (pid_to_thread_id (ecs->ptid));
1699 flush_cached_frames ();
1702 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1704 /* Pull the single step breakpoints out of the target. */
1705 SOFTWARE_SINGLE_STEP (0, 0);
1706 singlestep_breakpoints_inserted_p = 0;
1709 /* If PC is pointing at a nullified instruction, then step beyond
1710 it so that the user won't be confused when GDB appears to be ready
1713 /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */
1714 if (INSTRUCTION_NULLIFIED)
1716 registers_changed ();
1717 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0);
1719 /* We may have received a signal that we want to pass to
1720 the inferior; therefore, we must not clobber the waitstatus
1723 ecs->infwait_state = infwait_nullified_state;
1724 ecs->waiton_ptid = ecs->ptid;
1725 ecs->wp = &(ecs->tmpstatus);
1726 prepare_to_wait (ecs);
1730 /* It may not be necessary to disable the watchpoint to stop over
1731 it. For example, the PA can (with some kernel cooperation)
1732 single step over a watchpoint without disabling the watchpoint. */
1733 if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1736 prepare_to_wait (ecs);
1740 /* It is far more common to need to disable a watchpoint to step
1741 the inferior over it. FIXME. What else might a debug
1742 register or page protection watchpoint scheme need here? */
1743 if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1745 /* At this point, we are stopped at an instruction which has
1746 attempted to write to a piece of memory under control of
1747 a watchpoint. The instruction hasn't actually executed
1748 yet. If we were to evaluate the watchpoint expression
1749 now, we would get the old value, and therefore no change
1750 would seem to have occurred.
1752 In order to make watchpoints work `right', we really need
1753 to complete the memory write, and then evaluate the
1754 watchpoint expression. The following code does that by
1755 removing the watchpoint (actually, all watchpoints and
1756 breakpoints), single-stepping the target, re-inserting
1757 watchpoints, and then falling through to let normal
1758 single-step processing handle proceed. Since this
1759 includes evaluating watchpoints, things will come to a
1760 stop in the correct manner. */
1762 if (DECR_PC_AFTER_BREAK)
1763 write_pc (stop_pc - DECR_PC_AFTER_BREAK);
1765 remove_breakpoints ();
1766 registers_changed ();
1767 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */
1769 ecs->waiton_ptid = ecs->ptid;
1770 ecs->wp = &(ecs->ws);
1771 ecs->infwait_state = infwait_nonstep_watch_state;
1772 prepare_to_wait (ecs);
1776 /* It may be possible to simply continue after a watchpoint. */
1777 if (HAVE_CONTINUABLE_WATCHPOINT)
1778 STOPPED_BY_WATCHPOINT (ecs->ws);
1780 ecs->stop_func_start = 0;
1781 ecs->stop_func_end = 0;
1782 ecs->stop_func_name = 0;
1783 /* Don't care about return value; stop_func_start and stop_func_name
1784 will both be 0 if it doesn't work. */
1785 find_pc_partial_function (stop_pc, &ecs->stop_func_name,
1786 &ecs->stop_func_start, &ecs->stop_func_end);
1787 ecs->stop_func_start += FUNCTION_START_OFFSET;
1788 ecs->another_trap = 0;
1789 bpstat_clear (&stop_bpstat);
1791 stop_stack_dummy = 0;
1792 stop_print_frame = 1;
1793 ecs->random_signal = 0;
1794 stopped_by_random_signal = 0;
1795 breakpoints_failed = 0;
1797 /* Look at the cause of the stop, and decide what to do.
1798 The alternatives are:
1799 1) break; to really stop and return to the debugger,
1800 2) drop through to start up again
1801 (set ecs->another_trap to 1 to single step once)
1802 3) set ecs->random_signal to 1, and the decision between 1 and 2
1803 will be made according to the signal handling tables. */
1805 /* First, distinguish signals caused by the debugger from signals
1806 that have to do with the program's own actions.
1807 Note that breakpoint insns may cause SIGTRAP or SIGILL
1808 or SIGEMT, depending on the operating system version.
1809 Here we detect when a SIGILL or SIGEMT is really a breakpoint
1810 and change it to SIGTRAP. */
1812 if (stop_signal == TARGET_SIGNAL_TRAP
1813 || (breakpoints_inserted &&
1814 (stop_signal == TARGET_SIGNAL_ILL
1815 || stop_signal == TARGET_SIGNAL_EMT)) || stop_soon_quietly)
1817 if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap)
1819 stop_print_frame = 0;
1820 stop_stepping (ecs);
1823 if (stop_soon_quietly)
1825 stop_stepping (ecs);
1829 /* Don't even think about breakpoints
1830 if just proceeded over a breakpoint.
1832 However, if we are trying to proceed over a breakpoint
1833 and end up in sigtramp, then through_sigtramp_breakpoint
1834 will be set and we should check whether we've hit the
1836 if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected
1837 && through_sigtramp_breakpoint == NULL)
1838 bpstat_clear (&stop_bpstat);
1841 /* See if there is a breakpoint at the current PC. */
1843 /* The second argument of bpstat_stop_status is meant to help
1844 distinguish between a breakpoint trap and a singlestep trap.
1845 This is only important on targets where DECR_PC_AFTER_BREAK
1846 is non-zero. The prev_pc test is meant to distinguish between
1847 singlestepping a trap instruction, and singlestepping thru a
1848 jump to the instruction following a trap instruction.
1850 Therefore, pass TRUE if our reason for stopping is
1851 something other than hitting a breakpoint. We do this by
1852 checking that either: we detected earlier a software single
1853 step trap or, 1) stepping is going on and 2) we didn't hit
1854 a breakpoint in a signal handler without an intervening stop
1855 in sigtramp, which is detected by a new stack pointer value
1856 below any usual function calling stack adjustments. */
1860 sw_single_step_trap_p
1861 || (currently_stepping (ecs)
1862 && prev_pc != stop_pc - DECR_PC_AFTER_BREAK
1864 && INNER_THAN (read_sp (), (step_sp - 16)))));
1865 /* Following in case break condition called a
1867 stop_print_frame = 1;
1870 if (stop_signal == TARGET_SIGNAL_TRAP)
1872 = !(bpstat_explains_signal (stop_bpstat)
1874 || (!CALL_DUMMY_BREAKPOINT_OFFSET_P
1875 && DEPRECATED_PC_IN_CALL_DUMMY (stop_pc, read_sp (),
1876 get_frame_base (get_current_frame ())))
1877 || (step_range_end && step_resume_breakpoint == NULL));
1881 ecs->random_signal = !(bpstat_explains_signal (stop_bpstat)
1882 /* End of a stack dummy. Some systems (e.g. Sony
1883 news) give another signal besides SIGTRAP, so
1884 check here as well as above. */
1885 || (!CALL_DUMMY_BREAKPOINT_OFFSET_P
1886 && DEPRECATED_PC_IN_CALL_DUMMY (stop_pc, read_sp (),
1890 if (!ecs->random_signal)
1891 stop_signal = TARGET_SIGNAL_TRAP;
1895 /* When we reach this point, we've pretty much decided
1896 that the reason for stopping must've been a random
1897 (unexpected) signal. */
1900 ecs->random_signal = 1;
1901 /* If a fork, vfork or exec event was seen, then there are two
1902 possible responses we can make:
1904 1. If a catchpoint triggers for the event (ecs->random_signal == 0),
1905 then we must stop now and issue a prompt. We will resume
1906 the inferior when the user tells us to.
1907 2. If no catchpoint triggers for the event (ecs->random_signal == 1),
1908 then we must resume the inferior now and keep checking.
1910 In either case, we must take appropriate steps to "follow" the
1911 the fork/vfork/exec when the inferior is resumed. For example,
1912 if follow-fork-mode is "child", then we must detach from the
1913 parent inferior and follow the new child inferior.
1915 In either case, setting pending_follow causes the next resume()
1916 to take the appropriate following action. */
1917 process_event_stop_test:
1918 if (ecs->ws.kind == TARGET_WAITKIND_FORKED)
1920 if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */
1923 stop_signal = TARGET_SIGNAL_0;
1928 else if (ecs->ws.kind == TARGET_WAITKIND_VFORKED)
1930 if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */
1932 stop_signal = TARGET_SIGNAL_0;
1937 else if (ecs->ws.kind == TARGET_WAITKIND_EXECD)
1939 pending_follow.kind = ecs->ws.kind;
1940 if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */
1943 stop_signal = TARGET_SIGNAL_0;
1949 /* For the program's own signals, act according to
1950 the signal handling tables. */
1952 if (ecs->random_signal)
1954 /* Signal not for debugging purposes. */
1957 stopped_by_random_signal = 1;
1959 if (signal_print[stop_signal])
1962 target_terminal_ours_for_output ();
1963 print_stop_reason (SIGNAL_RECEIVED, stop_signal);
1965 if (signal_stop[stop_signal])
1967 stop_stepping (ecs);
1970 /* If not going to stop, give terminal back
1971 if we took it away. */
1973 target_terminal_inferior ();
1975 /* Clear the signal if it should not be passed. */
1976 if (signal_program[stop_signal] == 0)
1977 stop_signal = TARGET_SIGNAL_0;
1979 /* I'm not sure whether this needs to be check_sigtramp2 or
1980 whether it could/should be keep_going.
1982 This used to jump to step_over_function if we are stepping,
1985 Suppose the user does a `next' over a function call, and while
1986 that call is in progress, the inferior receives a signal for
1987 which GDB does not stop (i.e., signal_stop[SIG] is false). In
1988 that case, when we reach this point, there is already a
1989 step-resume breakpoint established, right where it should be:
1990 immediately after the function call the user is "next"-ing
1991 over. If we call step_over_function now, two bad things
1994 - we'll create a new breakpoint, at wherever the current
1995 frame's return address happens to be. That could be
1996 anywhere, depending on what function call happens to be on
1997 the top of the stack at that point. Point is, it's probably
1998 not where we need it.
2000 - the existing step-resume breakpoint (which is at the correct
2001 address) will get orphaned: step_resume_breakpoint will point
2002 to the new breakpoint, and the old step-resume breakpoint
2003 will never be cleaned up.
2005 The old behavior was meant to help HP-UX single-step out of
2006 sigtramps. It would place the new breakpoint at prev_pc, which
2007 was certainly wrong. I don't know the details there, so fixing
2008 this probably breaks that. As with anything else, it's up to
2009 the HP-UX maintainer to furnish a fix that doesn't break other
2010 platforms. --JimB, 20 May 1999 */
2011 check_sigtramp2 (ecs);
2016 /* Handle cases caused by hitting a breakpoint. */
2018 CORE_ADDR jmp_buf_pc;
2019 struct bpstat_what what;
2021 what = bpstat_what (stop_bpstat);
2023 if (what.call_dummy)
2025 stop_stack_dummy = 1;
2027 trap_expected_after_continue = 1;
2031 switch (what.main_action)
2033 case BPSTAT_WHAT_SET_LONGJMP_RESUME:
2034 /* If we hit the breakpoint at longjmp, disable it for the
2035 duration of this command. Then, install a temporary
2036 breakpoint at the target of the jmp_buf. */
2037 disable_longjmp_breakpoint ();
2038 remove_breakpoints ();
2039 breakpoints_inserted = 0;
2040 if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc))
2046 /* Need to blow away step-resume breakpoint, as it
2047 interferes with us */
2048 if (step_resume_breakpoint != NULL)
2050 delete_step_resume_breakpoint (&step_resume_breakpoint);
2052 /* Not sure whether we need to blow this away too, but probably
2053 it is like the step-resume breakpoint. */
2054 if (through_sigtramp_breakpoint != NULL)
2056 delete_breakpoint (through_sigtramp_breakpoint);
2057 through_sigtramp_breakpoint = NULL;
2061 /* FIXME - Need to implement nested temporary breakpoints */
2062 if (step_over_calls > 0)
2063 set_longjmp_resume_breakpoint (jmp_buf_pc, get_current_frame ());
2066 set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id);
2067 ecs->handling_longjmp = 1; /* FIXME */
2071 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME:
2072 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE:
2073 remove_breakpoints ();
2074 breakpoints_inserted = 0;
2076 /* FIXME - Need to implement nested temporary breakpoints */
2078 && (frame_id_inner (get_frame_id (get_current_frame ()),
2081 ecs->another_trap = 1;
2086 disable_longjmp_breakpoint ();
2087 ecs->handling_longjmp = 0; /* FIXME */
2088 if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME)
2090 /* else fallthrough */
2092 case BPSTAT_WHAT_SINGLE:
2093 if (breakpoints_inserted)
2095 remove_breakpoints ();
2097 breakpoints_inserted = 0;
2098 ecs->another_trap = 1;
2099 /* Still need to check other stuff, at least the case
2100 where we are stepping and step out of the right range. */
2103 case BPSTAT_WHAT_STOP_NOISY:
2104 stop_print_frame = 1;
2106 /* We are about to nuke the step_resume_breakpoint and
2107 through_sigtramp_breakpoint via the cleanup chain, so
2108 no need to worry about it here. */
2110 stop_stepping (ecs);
2113 case BPSTAT_WHAT_STOP_SILENT:
2114 stop_print_frame = 0;
2116 /* We are about to nuke the step_resume_breakpoint and
2117 through_sigtramp_breakpoint via the cleanup chain, so
2118 no need to worry about it here. */
2120 stop_stepping (ecs);
2123 case BPSTAT_WHAT_STEP_RESUME:
2124 /* This proably demands a more elegant solution, but, yeah
2127 This function's use of the simple variable
2128 step_resume_breakpoint doesn't seem to accomodate
2129 simultaneously active step-resume bp's, although the
2130 breakpoint list certainly can.
2132 If we reach here and step_resume_breakpoint is already
2133 NULL, then apparently we have multiple active
2134 step-resume bp's. We'll just delete the breakpoint we
2135 stopped at, and carry on.
2137 Correction: what the code currently does is delete a
2138 step-resume bp, but it makes no effort to ensure that
2139 the one deleted is the one currently stopped at. MVS */
2141 if (step_resume_breakpoint == NULL)
2143 step_resume_breakpoint =
2144 bpstat_find_step_resume_breakpoint (stop_bpstat);
2146 delete_step_resume_breakpoint (&step_resume_breakpoint);
2149 case BPSTAT_WHAT_THROUGH_SIGTRAMP:
2150 if (through_sigtramp_breakpoint)
2151 delete_breakpoint (through_sigtramp_breakpoint);
2152 through_sigtramp_breakpoint = NULL;
2154 /* If were waiting for a trap, hitting the step_resume_break
2155 doesn't count as getting it. */
2157 ecs->another_trap = 1;
2160 case BPSTAT_WHAT_CHECK_SHLIBS:
2161 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK:
2164 /* Remove breakpoints, we eventually want to step over the
2165 shlib event breakpoint, and SOLIB_ADD might adjust
2166 breakpoint addresses via breakpoint_re_set. */
2167 if (breakpoints_inserted)
2168 remove_breakpoints ();
2169 breakpoints_inserted = 0;
2171 /* Check for any newly added shared libraries if we're
2172 supposed to be adding them automatically. Switch
2173 terminal for any messages produced by
2174 breakpoint_re_set. */
2175 target_terminal_ours_for_output ();
2176 SOLIB_ADD (NULL, 0, NULL, auto_solib_add);
2177 target_terminal_inferior ();
2179 /* Try to reenable shared library breakpoints, additional
2180 code segments in shared libraries might be mapped in now. */
2181 re_enable_breakpoints_in_shlibs ();
2183 /* If requested, stop when the dynamic linker notifies
2184 gdb of events. This allows the user to get control
2185 and place breakpoints in initializer routines for
2186 dynamically loaded objects (among other things). */
2187 if (stop_on_solib_events)
2189 stop_stepping (ecs);
2193 /* If we stopped due to an explicit catchpoint, then the
2194 (see above) call to SOLIB_ADD pulled in any symbols
2195 from a newly-loaded library, if appropriate.
2197 We do want the inferior to stop, but not where it is
2198 now, which is in the dynamic linker callback. Rather,
2199 we would like it stop in the user's program, just after
2200 the call that caused this catchpoint to trigger. That
2201 gives the user a more useful vantage from which to
2202 examine their program's state. */
2203 else if (what.main_action ==
2204 BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK)
2206 /* ??rehrauer: If I could figure out how to get the
2207 right return PC from here, we could just set a temp
2208 breakpoint and resume. I'm not sure we can without
2209 cracking open the dld's shared libraries and sniffing
2210 their unwind tables and text/data ranges, and that's
2211 not a terribly portable notion.
2213 Until that time, we must step the inferior out of the
2214 dld callback, and also out of the dld itself (and any
2215 code or stubs in libdld.sl, such as "shl_load" and
2216 friends) until we reach non-dld code. At that point,
2217 we can stop stepping. */
2218 bpstat_get_triggered_catchpoints (stop_bpstat,
2220 stepping_through_solib_catchpoints);
2221 ecs->stepping_through_solib_after_catch = 1;
2223 /* Be sure to lift all breakpoints, so the inferior does
2224 actually step past this point... */
2225 ecs->another_trap = 1;
2230 /* We want to step over this breakpoint, then keep going. */
2231 ecs->another_trap = 1;
2238 case BPSTAT_WHAT_LAST:
2239 /* Not a real code, but listed here to shut up gcc -Wall. */
2241 case BPSTAT_WHAT_KEEP_CHECKING:
2246 /* We come here if we hit a breakpoint but should not
2247 stop for it. Possibly we also were stepping
2248 and should stop for that. So fall through and
2249 test for stepping. But, if not stepping,
2252 /* Are we stepping to get the inferior out of the dynamic
2253 linker's hook (and possibly the dld itself) after catching
2255 if (ecs->stepping_through_solib_after_catch)
2257 #if defined(SOLIB_ADD)
2258 /* Have we reached our destination? If not, keep going. */
2259 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc))
2261 ecs->another_trap = 1;
2266 /* Else, stop and report the catchpoint(s) whose triggering
2267 caused us to begin stepping. */
2268 ecs->stepping_through_solib_after_catch = 0;
2269 bpstat_clear (&stop_bpstat);
2270 stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints);
2271 bpstat_clear (&ecs->stepping_through_solib_catchpoints);
2272 stop_print_frame = 1;
2273 stop_stepping (ecs);
2277 if (!CALL_DUMMY_BREAKPOINT_OFFSET_P)
2279 /* This is the old way of detecting the end of the stack dummy.
2280 An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets
2281 handled above. As soon as we can test it on all of them, all
2282 architectures should define it. */
2284 /* If this is the breakpoint at the end of a stack dummy,
2285 just stop silently, unless the user was doing an si/ni, in which
2286 case she'd better know what she's doing. */
2288 if (CALL_DUMMY_HAS_COMPLETED (stop_pc, read_sp (),
2289 get_frame_base (get_current_frame ()))
2292 stop_print_frame = 0;
2293 stop_stack_dummy = 1;
2295 trap_expected_after_continue = 1;
2297 stop_stepping (ecs);
2302 if (step_resume_breakpoint)
2304 /* Having a step-resume breakpoint overrides anything
2305 else having to do with stepping commands until
2306 that breakpoint is reached. */
2307 /* I'm not sure whether this needs to be check_sigtramp2 or
2308 whether it could/should be keep_going. */
2309 check_sigtramp2 (ecs);
2314 if (step_range_end == 0)
2316 /* Likewise if we aren't even stepping. */
2317 /* I'm not sure whether this needs to be check_sigtramp2 or
2318 whether it could/should be keep_going. */
2319 check_sigtramp2 (ecs);
2324 /* If stepping through a line, keep going if still within it.
2326 Note that step_range_end is the address of the first instruction
2327 beyond the step range, and NOT the address of the last instruction
2329 if (stop_pc >= step_range_start && stop_pc < step_range_end)
2331 /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal.
2332 So definately need to check for sigtramp here. */
2333 check_sigtramp2 (ecs);
2338 /* We stepped out of the stepping range. */
2340 /* If we are stepping at the source level and entered the runtime
2341 loader dynamic symbol resolution code, we keep on single stepping
2342 until we exit the run time loader code and reach the callee's
2344 if (step_over_calls == STEP_OVER_UNDEBUGGABLE
2345 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc))
2347 CORE_ADDR pc_after_resolver = SKIP_SOLIB_RESOLVER (stop_pc);
2349 if (pc_after_resolver)
2351 /* Set up a step-resume breakpoint at the address
2352 indicated by SKIP_SOLIB_RESOLVER. */
2353 struct symtab_and_line sr_sal;
2355 sr_sal.pc = pc_after_resolver;
2357 check_for_old_step_resume_breakpoint ();
2358 step_resume_breakpoint =
2359 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2360 if (breakpoints_inserted)
2361 insert_breakpoints ();
2368 /* We can't update step_sp every time through the loop, because
2369 reading the stack pointer would slow down stepping too much.
2370 But we can update it every time we leave the step range. */
2371 ecs->update_step_sp = 1;
2373 /* Did we just take a signal? */
2374 if (PC_IN_SIGTRAMP (stop_pc, ecs->stop_func_name)
2375 && !PC_IN_SIGTRAMP (prev_pc, prev_func_name)
2376 && INNER_THAN (read_sp (), step_sp))
2378 /* We've just taken a signal; go until we are back to
2379 the point where we took it and one more. */
2381 /* Note: The test above succeeds not only when we stepped
2382 into a signal handler, but also when we step past the last
2383 statement of a signal handler and end up in the return stub
2384 of the signal handler trampoline. To distinguish between
2385 these two cases, check that the frame is INNER_THAN the
2386 previous one below. pai/1997-09-11 */
2390 struct frame_id current_frame = get_frame_id (get_current_frame ());
2392 if (frame_id_inner (current_frame, step_frame_id))
2394 /* We have just taken a signal; go until we are back to
2395 the point where we took it and one more. */
2397 /* This code is needed at least in the following case:
2398 The user types "next" and then a signal arrives (before
2399 the "next" is done). */
2401 /* Note that if we are stopped at a breakpoint, then we need
2402 the step_resume breakpoint to override any breakpoints at
2403 the same location, so that we will still step over the
2404 breakpoint even though the signal happened. */
2405 struct symtab_and_line sr_sal;
2408 sr_sal.symtab = NULL;
2410 sr_sal.pc = prev_pc;
2411 /* We could probably be setting the frame to
2412 step_frame_id; I don't think anyone thought to try it. */
2413 check_for_old_step_resume_breakpoint ();
2414 step_resume_breakpoint =
2415 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2416 if (breakpoints_inserted)
2417 insert_breakpoints ();
2421 /* We just stepped out of a signal handler and into
2422 its calling trampoline.
2424 Normally, we'd call step_over_function from
2425 here, but for some reason GDB can't unwind the
2426 stack correctly to find the real PC for the point
2427 user code where the signal trampoline will return
2428 -- FRAME_SAVED_PC fails, at least on HP-UX 10.20.
2429 But signal trampolines are pretty small stubs of
2430 code, anyway, so it's OK instead to just
2431 single-step out. Note: assuming such trampolines
2432 don't exhibit recursion on any platform... */
2433 find_pc_partial_function (stop_pc, &ecs->stop_func_name,
2434 &ecs->stop_func_start,
2435 &ecs->stop_func_end);
2436 /* Readjust stepping range */
2437 step_range_start = ecs->stop_func_start;
2438 step_range_end = ecs->stop_func_end;
2439 ecs->stepping_through_sigtramp = 1;
2444 /* If this is stepi or nexti, make sure that the stepping range
2445 gets us past that instruction. */
2446 if (step_range_end == 1)
2447 /* FIXME: Does this run afoul of the code below which, if
2448 we step into the middle of a line, resets the stepping
2450 step_range_end = (step_range_start = prev_pc) + 1;
2452 ecs->remove_breakpoints_on_following_step = 1;
2457 if (stop_pc == ecs->stop_func_start /* Quick test */
2458 || (in_prologue (stop_pc, ecs->stop_func_start) &&
2459 !IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name))
2460 || IN_SOLIB_CALL_TRAMPOLINE (stop_pc, ecs->stop_func_name)
2461 || ecs->stop_func_name == 0)
2463 /* It's a subroutine call. */
2465 if ((step_over_calls == STEP_OVER_NONE)
2466 || ((step_range_end == 1)
2467 && in_prologue (prev_pc, ecs->stop_func_start)))
2469 /* I presume that step_over_calls is only 0 when we're
2470 supposed to be stepping at the assembly language level
2471 ("stepi"). Just stop. */
2472 /* Also, maybe we just did a "nexti" inside a prolog,
2473 so we thought it was a subroutine call but it was not.
2474 Stop as well. FENN */
2476 print_stop_reason (END_STEPPING_RANGE, 0);
2477 stop_stepping (ecs);
2481 if (step_over_calls == STEP_OVER_ALL || IGNORE_HELPER_CALL (stop_pc))
2483 /* We're doing a "next". */
2485 if (PC_IN_SIGTRAMP (stop_pc, ecs->stop_func_name)
2486 && frame_id_inner (step_frame_id,
2487 frame_id_build (read_sp (), 0)))
2488 /* We stepped out of a signal handler, and into its
2489 calling trampoline. This is misdetected as a
2490 subroutine call, but stepping over the signal
2491 trampoline isn't such a bad idea. In order to do that,
2492 we have to ignore the value in step_frame_id, since
2493 that doesn't represent the frame that'll reach when we
2494 return from the signal trampoline. Otherwise we'll
2495 probably continue to the end of the program. */
2496 step_frame_id = null_frame_id;
2498 step_over_function (ecs);
2503 /* If we are in a function call trampoline (a stub between
2504 the calling routine and the real function), locate the real
2505 function. That's what tells us (a) whether we want to step
2506 into it at all, and (b) what prologue we want to run to
2507 the end of, if we do step into it. */
2508 tmp = SKIP_TRAMPOLINE_CODE (stop_pc);
2510 ecs->stop_func_start = tmp;
2513 tmp = DYNAMIC_TRAMPOLINE_NEXTPC (stop_pc);
2516 struct symtab_and_line xxx;
2517 /* Why isn't this s_a_l called "sr_sal", like all of the
2518 other s_a_l's where this code is duplicated? */
2519 init_sal (&xxx); /* initialize to zeroes */
2521 xxx.section = find_pc_overlay (xxx.pc);
2522 check_for_old_step_resume_breakpoint ();
2523 step_resume_breakpoint =
2524 set_momentary_breakpoint (xxx, null_frame_id, bp_step_resume);
2525 insert_breakpoints ();
2531 /* If we have line number information for the function we
2532 are thinking of stepping into, step into it.
2534 If there are several symtabs at that PC (e.g. with include
2535 files), just want to know whether *any* of them have line
2536 numbers. find_pc_line handles this. */
2538 struct symtab_and_line tmp_sal;
2540 tmp_sal = find_pc_line (ecs->stop_func_start, 0);
2541 if (tmp_sal.line != 0)
2543 step_into_function (ecs);
2548 /* If we have no line number and the step-stop-if-no-debug
2549 is set, we stop the step so that the user has a chance to
2550 switch in assembly mode. */
2551 if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug)
2554 print_stop_reason (END_STEPPING_RANGE, 0);
2555 stop_stepping (ecs);
2559 step_over_function (ecs);
2565 /* We've wandered out of the step range. */
2567 ecs->sal = find_pc_line (stop_pc, 0);
2569 if (step_range_end == 1)
2571 /* It is stepi or nexti. We always want to stop stepping after
2574 print_stop_reason (END_STEPPING_RANGE, 0);
2575 stop_stepping (ecs);
2579 /* If we're in the return path from a shared library trampoline,
2580 we want to proceed through the trampoline when stepping. */
2581 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name))
2585 /* Determine where this trampoline returns. */
2586 tmp = SKIP_TRAMPOLINE_CODE (stop_pc);
2588 /* Only proceed through if we know where it's going. */
2591 /* And put the step-breakpoint there and go until there. */
2592 struct symtab_and_line sr_sal;
2594 init_sal (&sr_sal); /* initialize to zeroes */
2596 sr_sal.section = find_pc_overlay (sr_sal.pc);
2597 /* Do not specify what the fp should be when we stop
2598 since on some machines the prologue
2599 is where the new fp value is established. */
2600 check_for_old_step_resume_breakpoint ();
2601 step_resume_breakpoint =
2602 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2603 if (breakpoints_inserted)
2604 insert_breakpoints ();
2606 /* Restart without fiddling with the step ranges or
2613 if (ecs->sal.line == 0)
2615 /* We have no line number information. That means to stop
2616 stepping (does this always happen right after one instruction,
2617 when we do "s" in a function with no line numbers,
2618 or can this happen as a result of a return or longjmp?). */
2620 print_stop_reason (END_STEPPING_RANGE, 0);
2621 stop_stepping (ecs);
2625 if ((stop_pc == ecs->sal.pc)
2626 && (ecs->current_line != ecs->sal.line
2627 || ecs->current_symtab != ecs->sal.symtab))
2629 /* We are at the start of a different line. So stop. Note that
2630 we don't stop if we step into the middle of a different line.
2631 That is said to make things like for (;;) statements work
2634 print_stop_reason (END_STEPPING_RANGE, 0);
2635 stop_stepping (ecs);
2639 /* We aren't done stepping.
2641 Optimize by setting the stepping range to the line.
2642 (We might not be in the original line, but if we entered a
2643 new line in mid-statement, we continue stepping. This makes
2644 things like for(;;) statements work better.) */
2646 if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end)
2648 /* If this is the last line of the function, don't keep stepping
2649 (it would probably step us out of the function).
2650 This is particularly necessary for a one-line function,
2651 in which after skipping the prologue we better stop even though
2652 we will be in mid-line. */
2654 print_stop_reason (END_STEPPING_RANGE, 0);
2655 stop_stepping (ecs);
2658 step_range_start = ecs->sal.pc;
2659 step_range_end = ecs->sal.end;
2660 step_frame_id = get_frame_id (get_current_frame ());
2661 ecs->current_line = ecs->sal.line;
2662 ecs->current_symtab = ecs->sal.symtab;
2664 /* In the case where we just stepped out of a function into the
2665 middle of a line of the caller, continue stepping, but
2666 step_frame_id must be modified to current frame */
2668 struct frame_id current_frame = get_frame_id (get_current_frame ());
2669 if (!(frame_id_inner (current_frame, step_frame_id)))
2670 step_frame_id = current_frame;
2676 /* Are we in the middle of stepping? */
2679 currently_stepping (struct execution_control_state *ecs)
2681 return ((through_sigtramp_breakpoint == NULL
2682 && !ecs->handling_longjmp
2683 && ((step_range_end && step_resume_breakpoint == NULL)
2685 || ecs->stepping_through_solib_after_catch
2686 || bpstat_should_step ());
2690 check_sigtramp2 (struct execution_control_state *ecs)
2693 && PC_IN_SIGTRAMP (stop_pc, ecs->stop_func_name)
2694 && !PC_IN_SIGTRAMP (prev_pc, prev_func_name)
2695 && INNER_THAN (read_sp (), step_sp))
2697 /* What has happened here is that we have just stepped the
2698 inferior with a signal (because it is a signal which
2699 shouldn't make us stop), thus stepping into sigtramp.
2701 So we need to set a step_resume_break_address breakpoint and
2702 continue until we hit it, and then step. FIXME: This should
2703 be more enduring than a step_resume breakpoint; we should
2704 know that we will later need to keep going rather than
2705 re-hitting the breakpoint here (see the testsuite,
2706 gdb.base/signals.exp where it says "exceedingly difficult"). */
2708 struct symtab_and_line sr_sal;
2710 init_sal (&sr_sal); /* initialize to zeroes */
2711 sr_sal.pc = prev_pc;
2712 sr_sal.section = find_pc_overlay (sr_sal.pc);
2713 /* We perhaps could set the frame if we kept track of what the
2714 frame corresponding to prev_pc was. But we don't, so don't. */
2715 through_sigtramp_breakpoint =
2716 set_momentary_breakpoint (sr_sal, null_frame_id, bp_through_sigtramp);
2717 if (breakpoints_inserted)
2718 insert_breakpoints ();
2720 ecs->remove_breakpoints_on_following_step = 1;
2721 ecs->another_trap = 1;
2725 /* Subroutine call with source code we should not step over. Do step
2726 to the first line of code in it. */
2729 step_into_function (struct execution_control_state *ecs)
2732 struct symtab_and_line sr_sal;
2734 s = find_pc_symtab (stop_pc);
2735 if (s && s->language != language_asm)
2736 ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start);
2738 ecs->sal = find_pc_line (ecs->stop_func_start, 0);
2739 /* Use the step_resume_break to step until the end of the prologue,
2740 even if that involves jumps (as it seems to on the vax under
2742 /* If the prologue ends in the middle of a source line, continue to
2743 the end of that source line (if it is still within the function).
2744 Otherwise, just go to end of prologue. */
2745 #ifdef PROLOGUE_FIRSTLINE_OVERLAP
2746 /* no, don't either. It skips any code that's legitimately on the
2750 && ecs->sal.pc != ecs->stop_func_start
2751 && ecs->sal.end < ecs->stop_func_end)
2752 ecs->stop_func_start = ecs->sal.end;
2755 if (ecs->stop_func_start == stop_pc)
2757 /* We are already there: stop now. */
2759 print_stop_reason (END_STEPPING_RANGE, 0);
2760 stop_stepping (ecs);
2765 /* Put the step-breakpoint there and go until there. */
2766 init_sal (&sr_sal); /* initialize to zeroes */
2767 sr_sal.pc = ecs->stop_func_start;
2768 sr_sal.section = find_pc_overlay (ecs->stop_func_start);
2769 /* Do not specify what the fp should be when we stop since on
2770 some machines the prologue is where the new fp value is
2772 check_for_old_step_resume_breakpoint ();
2773 step_resume_breakpoint =
2774 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2775 if (breakpoints_inserted)
2776 insert_breakpoints ();
2778 /* And make sure stepping stops right away then. */
2779 step_range_end = step_range_start;
2784 /* We've just entered a callee, and we wish to resume until it returns
2785 to the caller. Setting a step_resume breakpoint on the return
2786 address will catch a return from the callee.
2788 However, if the callee is recursing, we want to be careful not to
2789 catch returns of those recursive calls, but only of THIS instance
2792 To do this, we set the step_resume bp's frame to our current
2793 caller's frame (step_frame_id, which is set by the "next" or
2794 "until" command, before execution begins). */
2797 step_over_function (struct execution_control_state *ecs)
2799 struct symtab_and_line sr_sal;
2801 init_sal (&sr_sal); /* initialize to zeros */
2802 sr_sal.pc = ADDR_BITS_REMOVE (SAVED_PC_AFTER_CALL (get_current_frame ()));
2803 sr_sal.section = find_pc_overlay (sr_sal.pc);
2805 check_for_old_step_resume_breakpoint ();
2806 step_resume_breakpoint =
2807 set_momentary_breakpoint (sr_sal, get_frame_id (get_current_frame ()),
2810 if (frame_id_p (step_frame_id)
2811 && !IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal.pc))
2812 step_resume_breakpoint->frame_id = step_frame_id;
2814 if (breakpoints_inserted)
2815 insert_breakpoints ();
2819 stop_stepping (struct execution_control_state *ecs)
2821 if (target_has_execution)
2823 /* Are we stopping for a vfork event? We only stop when we see
2824 the child's event. However, we may not yet have seen the
2825 parent's event. And, inferior_ptid is still set to the
2826 parent's pid, until we resume again and follow either the
2829 To ensure that we can really touch inferior_ptid (aka, the
2830 parent process) -- which calls to functions like read_pc
2831 implicitly do -- wait on the parent if necessary. */
2832 if ((pending_follow.kind == TARGET_WAITKIND_VFORKED)
2833 && !pending_follow.fork_event.saw_parent_fork)
2839 if (target_wait_hook)
2840 parent_ptid = target_wait_hook (pid_to_ptid (-1), &(ecs->ws));
2842 parent_ptid = target_wait (pid_to_ptid (-1), &(ecs->ws));
2844 while (!ptid_equal (parent_ptid, inferior_ptid));
2847 /* Assuming the inferior still exists, set these up for next
2848 time, just like we did above if we didn't break out of the
2850 prev_pc = read_pc ();
2851 prev_func_start = ecs->stop_func_start;
2852 prev_func_name = ecs->stop_func_name;
2855 /* Let callers know we don't want to wait for the inferior anymore. */
2856 ecs->wait_some_more = 0;
2859 /* This function handles various cases where we need to continue
2860 waiting for the inferior. */
2861 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2864 keep_going (struct execution_control_state *ecs)
2866 /* Save the pc before execution, to compare with pc after stop. */
2867 prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */
2868 prev_func_start = ecs->stop_func_start; /* Ok, since if DECR_PC_AFTER
2869 BREAK is defined, the
2870 original pc would not have
2871 been at the start of a
2873 prev_func_name = ecs->stop_func_name;
2875 if (ecs->update_step_sp)
2876 step_sp = read_sp ();
2877 ecs->update_step_sp = 0;
2879 /* If we did not do break;, it means we should keep running the
2880 inferior and not return to debugger. */
2882 if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP)
2884 /* We took a signal (which we are supposed to pass through to
2885 the inferior, else we'd have done a break above) and we
2886 haven't yet gotten our trap. Simply continue. */
2887 resume (currently_stepping (ecs), stop_signal);
2891 /* Either the trap was not expected, but we are continuing
2892 anyway (the user asked that this signal be passed to the
2895 The signal was SIGTRAP, e.g. it was our signal, but we
2896 decided we should resume from it.
2898 We're going to run this baby now!
2900 Insert breakpoints now, unless we are trying to one-proceed
2901 past a breakpoint. */
2902 /* If we've just finished a special step resume and we don't
2903 want to hit a breakpoint, pull em out. */
2904 if (step_resume_breakpoint == NULL
2905 && through_sigtramp_breakpoint == NULL
2906 && ecs->remove_breakpoints_on_following_step)
2908 ecs->remove_breakpoints_on_following_step = 0;
2909 remove_breakpoints ();
2910 breakpoints_inserted = 0;
2912 else if (!breakpoints_inserted &&
2913 (through_sigtramp_breakpoint != NULL || !ecs->another_trap))
2915 breakpoints_failed = insert_breakpoints ();
2916 if (breakpoints_failed)
2918 stop_stepping (ecs);
2921 breakpoints_inserted = 1;
2924 trap_expected = ecs->another_trap;
2926 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2927 specifies that such a signal should be delivered to the
2930 Typically, this would occure when a user is debugging a
2931 target monitor on a simulator: the target monitor sets a
2932 breakpoint; the simulator encounters this break-point and
2933 halts the simulation handing control to GDB; GDB, noteing
2934 that the break-point isn't valid, returns control back to the
2935 simulator; the simulator then delivers the hardware
2936 equivalent of a SIGNAL_TRAP to the program being debugged. */
2938 if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal])
2939 stop_signal = TARGET_SIGNAL_0;
2941 #ifdef SHIFT_INST_REGS
2942 /* I'm not sure when this following segment applies. I do know,
2943 now, that we shouldn't rewrite the regs when we were stopped
2944 by a random signal from the inferior process. */
2945 /* FIXME: Shouldn't this be based on the valid bit of the SXIP?
2946 (this is only used on the 88k). */
2948 if (!bpstat_explains_signal (stop_bpstat)
2949 && (stop_signal != TARGET_SIGNAL_CHLD) && !stopped_by_random_signal)
2951 #endif /* SHIFT_INST_REGS */
2953 resume (currently_stepping (ecs), stop_signal);
2956 prepare_to_wait (ecs);
2959 /* This function normally comes after a resume, before
2960 handle_inferior_event exits. It takes care of any last bits of
2961 housekeeping, and sets the all-important wait_some_more flag. */
2964 prepare_to_wait (struct execution_control_state *ecs)
2966 if (ecs->infwait_state == infwait_normal_state)
2968 overlay_cache_invalid = 1;
2970 /* We have to invalidate the registers BEFORE calling
2971 target_wait because they can be loaded from the target while
2972 in target_wait. This makes remote debugging a bit more
2973 efficient for those targets that provide critical registers
2974 as part of their normal status mechanism. */
2976 registers_changed ();
2977 ecs->waiton_ptid = pid_to_ptid (-1);
2978 ecs->wp = &(ecs->ws);
2980 /* This is the old end of the while loop. Let everybody know we
2981 want to wait for the inferior some more and get called again
2983 ecs->wait_some_more = 1;
2986 /* Print why the inferior has stopped. We always print something when
2987 the inferior exits, or receives a signal. The rest of the cases are
2988 dealt with later on in normal_stop() and print_it_typical(). Ideally
2989 there should be a call to this function from handle_inferior_event()
2990 each time stop_stepping() is called.*/
2992 print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info)
2994 switch (stop_reason)
2997 /* We don't deal with these cases from handle_inferior_event()
3000 case END_STEPPING_RANGE:
3001 /* We are done with a step/next/si/ni command. */
3002 /* For now print nothing. */
3003 /* Print a message only if not in the middle of doing a "step n"
3004 operation for n > 1 */
3005 if (!step_multi || !stop_step)
3006 if (ui_out_is_mi_like_p (uiout))
3007 ui_out_field_string (uiout, "reason", "end-stepping-range");
3009 case BREAKPOINT_HIT:
3010 /* We found a breakpoint. */
3011 /* For now print nothing. */
3014 /* The inferior was terminated by a signal. */
3015 annotate_signalled ();
3016 if (ui_out_is_mi_like_p (uiout))
3017 ui_out_field_string (uiout, "reason", "exited-signalled");
3018 ui_out_text (uiout, "\nProgram terminated with signal ");
3019 annotate_signal_name ();
3020 ui_out_field_string (uiout, "signal-name",
3021 target_signal_to_name (stop_info));
3022 annotate_signal_name_end ();
3023 ui_out_text (uiout, ", ");
3024 annotate_signal_string ();
3025 ui_out_field_string (uiout, "signal-meaning",
3026 target_signal_to_string (stop_info));
3027 annotate_signal_string_end ();
3028 ui_out_text (uiout, ".\n");
3029 ui_out_text (uiout, "The program no longer exists.\n");
3032 /* The inferior program is finished. */
3033 annotate_exited (stop_info);
3036 if (ui_out_is_mi_like_p (uiout))
3037 ui_out_field_string (uiout, "reason", "exited");
3038 ui_out_text (uiout, "\nProgram exited with code ");
3039 ui_out_field_fmt (uiout, "exit-code", "0%o",
3040 (unsigned int) stop_info);
3041 ui_out_text (uiout, ".\n");
3045 if (ui_out_is_mi_like_p (uiout))
3046 ui_out_field_string (uiout, "reason", "exited-normally");
3047 ui_out_text (uiout, "\nProgram exited normally.\n");
3050 case SIGNAL_RECEIVED:
3051 /* Signal received. The signal table tells us to print about
3054 ui_out_text (uiout, "\nProgram received signal ");
3055 annotate_signal_name ();
3056 if (ui_out_is_mi_like_p (uiout))
3057 ui_out_field_string (uiout, "reason", "signal-received");
3058 ui_out_field_string (uiout, "signal-name",
3059 target_signal_to_name (stop_info));
3060 annotate_signal_name_end ();
3061 ui_out_text (uiout, ", ");
3062 annotate_signal_string ();
3063 ui_out_field_string (uiout, "signal-meaning",
3064 target_signal_to_string (stop_info));
3065 annotate_signal_string_end ();
3066 ui_out_text (uiout, ".\n");
3069 internal_error (__FILE__, __LINE__,
3070 "print_stop_reason: unrecognized enum value");
3076 /* Here to return control to GDB when the inferior stops for real.
3077 Print appropriate messages, remove breakpoints, give terminal our modes.
3079 STOP_PRINT_FRAME nonzero means print the executing frame
3080 (pc, function, args, file, line number and line text).
3081 BREAKPOINTS_FAILED nonzero means stop was due to error
3082 attempting to insert breakpoints. */
3087 /* As with the notification of thread events, we want to delay
3088 notifying the user that we've switched thread context until
3089 the inferior actually stops.
3091 (Note that there's no point in saying anything if the inferior
3093 if (!ptid_equal (previous_inferior_ptid, inferior_ptid)
3094 && target_has_execution)
3096 target_terminal_ours_for_output ();
3097 printf_filtered ("[Switching to %s]\n",
3098 target_pid_or_tid_to_str (inferior_ptid));
3099 previous_inferior_ptid = inferior_ptid;
3102 /* Make sure that the current_frame's pc is correct. This
3103 is a correction for setting up the frame info before doing
3104 DECR_PC_AFTER_BREAK */
3105 if (target_has_execution && get_current_frame ())
3106 (get_current_frame ())->pc = read_pc ();
3108 if (target_has_execution && breakpoints_inserted)
3110 if (remove_breakpoints ())
3112 target_terminal_ours_for_output ();
3113 printf_filtered ("Cannot remove breakpoints because ");
3114 printf_filtered ("program is no longer writable.\n");
3115 printf_filtered ("It might be running in another process.\n");
3116 printf_filtered ("Further execution is probably impossible.\n");
3119 breakpoints_inserted = 0;
3121 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3122 Delete any breakpoint that is to be deleted at the next stop. */
3124 breakpoint_auto_delete (stop_bpstat);
3126 /* If an auto-display called a function and that got a signal,
3127 delete that auto-display to avoid an infinite recursion. */
3129 if (stopped_by_random_signal)
3130 disable_current_display ();
3132 /* Don't print a message if in the middle of doing a "step n"
3133 operation for n > 1 */
3134 if (step_multi && stop_step)
3137 target_terminal_ours ();
3139 /* Look up the hook_stop and run it (CLI internally handles problem
3140 of stop_command's pre-hook not existing). */
3142 catch_errors (hook_stop_stub, stop_command,
3143 "Error while running hook_stop:\n", RETURN_MASK_ALL);
3145 if (!target_has_stack)
3151 /* Select innermost stack frame - i.e., current frame is frame 0,
3152 and current location is based on that.
3153 Don't do this on return from a stack dummy routine,
3154 or if the program has exited. */
3156 if (!stop_stack_dummy)
3158 select_frame (get_current_frame ());
3160 /* Print current location without a level number, if
3161 we have changed functions or hit a breakpoint.
3162 Print source line if we have one.
3163 bpstat_print() contains the logic deciding in detail
3164 what to print, based on the event(s) that just occurred. */
3166 if (stop_print_frame && deprecated_selected_frame)
3170 int do_frame_printing = 1;
3172 bpstat_ret = bpstat_print (stop_bpstat);
3176 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3177 (or should) carry around the function and does (or
3178 should) use that when doing a frame comparison. */
3180 && frame_id_eq (step_frame_id,
3181 get_frame_id (get_current_frame ()))
3182 && step_start_function == find_pc_function (stop_pc))
3183 source_flag = SRC_LINE; /* finished step, just print source line */
3185 source_flag = SRC_AND_LOC; /* print location and source line */
3187 case PRINT_SRC_AND_LOC:
3188 source_flag = SRC_AND_LOC; /* print location and source line */
3190 case PRINT_SRC_ONLY:
3191 source_flag = SRC_LINE;
3194 source_flag = SRC_LINE; /* something bogus */
3195 do_frame_printing = 0;
3198 internal_error (__FILE__, __LINE__, "Unknown value.");
3200 /* For mi, have the same behavior every time we stop:
3201 print everything but the source line. */
3202 if (ui_out_is_mi_like_p (uiout))
3203 source_flag = LOC_AND_ADDRESS;
3205 if (ui_out_is_mi_like_p (uiout))
3206 ui_out_field_int (uiout, "thread-id",
3207 pid_to_thread_id (inferior_ptid));
3208 /* The behavior of this routine with respect to the source
3210 SRC_LINE: Print only source line
3211 LOCATION: Print only location
3212 SRC_AND_LOC: Print location and source line */
3213 if (do_frame_printing)
3214 show_and_print_stack_frame (deprecated_selected_frame, -1, source_flag);
3216 /* Display the auto-display expressions. */
3221 /* Save the function value return registers, if we care.
3222 We might be about to restore their previous contents. */
3223 if (proceed_to_finish)
3224 /* NB: The copy goes through to the target picking up the value of
3225 all the registers. */
3226 regcache_cpy (stop_registers, current_regcache);
3228 if (stop_stack_dummy)
3230 /* Pop the empty frame that contains the stack dummy.
3231 POP_FRAME ends with a setting of the current frame, so we
3232 can use that next. */
3234 /* Set stop_pc to what it was before we called the function.
3235 Can't rely on restore_inferior_status because that only gets
3236 called if we don't stop in the called function. */
3237 stop_pc = read_pc ();
3238 select_frame (get_current_frame ());
3242 annotate_stopped ();
3246 hook_stop_stub (void *cmd)
3248 execute_cmd_pre_hook ((struct cmd_list_element *) cmd);
3253 signal_stop_state (int signo)
3255 return signal_stop[signo];
3259 signal_print_state (int signo)
3261 return signal_print[signo];
3265 signal_pass_state (int signo)
3267 return signal_program[signo];
3271 signal_stop_update (int signo, int state)
3273 int ret = signal_stop[signo];
3274 signal_stop[signo] = state;
3279 signal_print_update (int signo, int state)
3281 int ret = signal_print[signo];
3282 signal_print[signo] = state;
3287 signal_pass_update (int signo, int state)
3289 int ret = signal_program[signo];
3290 signal_program[signo] = state;
3295 sig_print_header (void)
3298 Signal Stop\tPrint\tPass to program\tDescription\n");
3302 sig_print_info (enum target_signal oursig)
3304 char *name = target_signal_to_name (oursig);
3305 int name_padding = 13 - strlen (name);
3307 if (name_padding <= 0)
3310 printf_filtered ("%s", name);
3311 printf_filtered ("%*.*s ", name_padding, name_padding, " ");
3312 printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No");
3313 printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No");
3314 printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No");
3315 printf_filtered ("%s\n", target_signal_to_string (oursig));
3318 /* Specify how various signals in the inferior should be handled. */
3321 handle_command (char *args, int from_tty)
3324 int digits, wordlen;
3325 int sigfirst, signum, siglast;
3326 enum target_signal oursig;
3329 unsigned char *sigs;
3330 struct cleanup *old_chain;
3334 error_no_arg ("signal to handle");
3337 /* Allocate and zero an array of flags for which signals to handle. */
3339 nsigs = (int) TARGET_SIGNAL_LAST;
3340 sigs = (unsigned char *) alloca (nsigs);
3341 memset (sigs, 0, nsigs);
3343 /* Break the command line up into args. */
3345 argv = buildargv (args);
3350 old_chain = make_cleanup_freeargv (argv);
3352 /* Walk through the args, looking for signal oursigs, signal names, and
3353 actions. Signal numbers and signal names may be interspersed with
3354 actions, with the actions being performed for all signals cumulatively
3355 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3357 while (*argv != NULL)
3359 wordlen = strlen (*argv);
3360 for (digits = 0; isdigit ((*argv)[digits]); digits++)
3364 sigfirst = siglast = -1;
3366 if (wordlen >= 1 && !strncmp (*argv, "all", wordlen))
3368 /* Apply action to all signals except those used by the
3369 debugger. Silently skip those. */
3372 siglast = nsigs - 1;
3374 else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen))
3376 SET_SIGS (nsigs, sigs, signal_stop);
3377 SET_SIGS (nsigs, sigs, signal_print);
3379 else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen))
3381 UNSET_SIGS (nsigs, sigs, signal_program);
3383 else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen))
3385 SET_SIGS (nsigs, sigs, signal_print);
3387 else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen))
3389 SET_SIGS (nsigs, sigs, signal_program);
3391 else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen))
3393 UNSET_SIGS (nsigs, sigs, signal_stop);
3395 else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen))
3397 SET_SIGS (nsigs, sigs, signal_program);
3399 else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen))
3401 UNSET_SIGS (nsigs, sigs, signal_print);
3402 UNSET_SIGS (nsigs, sigs, signal_stop);
3404 else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen))
3406 UNSET_SIGS (nsigs, sigs, signal_program);
3408 else if (digits > 0)
3410 /* It is numeric. The numeric signal refers to our own
3411 internal signal numbering from target.h, not to host/target
3412 signal number. This is a feature; users really should be
3413 using symbolic names anyway, and the common ones like
3414 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3416 sigfirst = siglast = (int)
3417 target_signal_from_command (atoi (*argv));
3418 if ((*argv)[digits] == '-')
3421 target_signal_from_command (atoi ((*argv) + digits + 1));
3423 if (sigfirst > siglast)
3425 /* Bet he didn't figure we'd think of this case... */
3433 oursig = target_signal_from_name (*argv);
3434 if (oursig != TARGET_SIGNAL_UNKNOWN)
3436 sigfirst = siglast = (int) oursig;
3440 /* Not a number and not a recognized flag word => complain. */
3441 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv);
3445 /* If any signal numbers or symbol names were found, set flags for
3446 which signals to apply actions to. */
3448 for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++)
3450 switch ((enum target_signal) signum)
3452 case TARGET_SIGNAL_TRAP:
3453 case TARGET_SIGNAL_INT:
3454 if (!allsigs && !sigs[signum])
3456 if (query ("%s is used by the debugger.\n\
3457 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum)))
3463 printf_unfiltered ("Not confirmed, unchanged.\n");
3464 gdb_flush (gdb_stdout);
3468 case TARGET_SIGNAL_0:
3469 case TARGET_SIGNAL_DEFAULT:
3470 case TARGET_SIGNAL_UNKNOWN:
3471 /* Make sure that "all" doesn't print these. */
3482 target_notice_signals (inferior_ptid);
3486 /* Show the results. */
3487 sig_print_header ();
3488 for (signum = 0; signum < nsigs; signum++)
3492 sig_print_info (signum);
3497 do_cleanups (old_chain);
3501 xdb_handle_command (char *args, int from_tty)
3504 struct cleanup *old_chain;
3506 /* Break the command line up into args. */
3508 argv = buildargv (args);
3513 old_chain = make_cleanup_freeargv (argv);
3514 if (argv[1] != (char *) NULL)
3519 bufLen = strlen (argv[0]) + 20;
3520 argBuf = (char *) xmalloc (bufLen);
3524 enum target_signal oursig;
3526 oursig = target_signal_from_name (argv[0]);
3527 memset (argBuf, 0, bufLen);
3528 if (strcmp (argv[1], "Q") == 0)
3529 sprintf (argBuf, "%s %s", argv[0], "noprint");
3532 if (strcmp (argv[1], "s") == 0)
3534 if (!signal_stop[oursig])
3535 sprintf (argBuf, "%s %s", argv[0], "stop");
3537 sprintf (argBuf, "%s %s", argv[0], "nostop");
3539 else if (strcmp (argv[1], "i") == 0)
3541 if (!signal_program[oursig])
3542 sprintf (argBuf, "%s %s", argv[0], "pass");
3544 sprintf (argBuf, "%s %s", argv[0], "nopass");
3546 else if (strcmp (argv[1], "r") == 0)
3548 if (!signal_print[oursig])
3549 sprintf (argBuf, "%s %s", argv[0], "print");
3551 sprintf (argBuf, "%s %s", argv[0], "noprint");
3557 handle_command (argBuf, from_tty);
3559 printf_filtered ("Invalid signal handling flag.\n");
3564 do_cleanups (old_chain);
3567 /* Print current contents of the tables set by the handle command.
3568 It is possible we should just be printing signals actually used
3569 by the current target (but for things to work right when switching
3570 targets, all signals should be in the signal tables). */
3573 signals_info (char *signum_exp, int from_tty)
3575 enum target_signal oursig;
3576 sig_print_header ();
3580 /* First see if this is a symbol name. */
3581 oursig = target_signal_from_name (signum_exp);
3582 if (oursig == TARGET_SIGNAL_UNKNOWN)
3584 /* No, try numeric. */
3586 target_signal_from_command (parse_and_eval_long (signum_exp));
3588 sig_print_info (oursig);
3592 printf_filtered ("\n");
3593 /* These ugly casts brought to you by the native VAX compiler. */
3594 for (oursig = TARGET_SIGNAL_FIRST;
3595 (int) oursig < (int) TARGET_SIGNAL_LAST;
3596 oursig = (enum target_signal) ((int) oursig + 1))
3600 if (oursig != TARGET_SIGNAL_UNKNOWN
3601 && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0)
3602 sig_print_info (oursig);
3605 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
3608 struct inferior_status
3610 enum target_signal stop_signal;
3614 int stop_stack_dummy;
3615 int stopped_by_random_signal;
3617 CORE_ADDR step_range_start;
3618 CORE_ADDR step_range_end;
3619 struct frame_id step_frame_id;
3620 enum step_over_calls_kind step_over_calls;
3621 CORE_ADDR step_resume_break_address;
3622 int stop_after_trap;
3623 int stop_soon_quietly;
3624 struct regcache *stop_registers;
3626 /* These are here because if call_function_by_hand has written some
3627 registers and then decides to call error(), we better not have changed
3629 struct regcache *registers;
3631 /* A frame unique identifier. */
3632 struct frame_id selected_frame_id;
3634 int breakpoint_proceeded;
3635 int restore_stack_info;
3636 int proceed_to_finish;
3640 write_inferior_status_register (struct inferior_status *inf_status, int regno,
3643 int size = REGISTER_RAW_SIZE (regno);
3644 void *buf = alloca (size);
3645 store_signed_integer (buf, size, val);
3646 regcache_raw_write (inf_status->registers, regno, buf);
3649 /* Save all of the information associated with the inferior<==>gdb
3650 connection. INF_STATUS is a pointer to a "struct inferior_status"
3651 (defined in inferior.h). */
3653 struct inferior_status *
3654 save_inferior_status (int restore_stack_info)
3656 struct inferior_status *inf_status = XMALLOC (struct inferior_status);
3658 inf_status->stop_signal = stop_signal;
3659 inf_status->stop_pc = stop_pc;
3660 inf_status->stop_step = stop_step;
3661 inf_status->stop_stack_dummy = stop_stack_dummy;
3662 inf_status->stopped_by_random_signal = stopped_by_random_signal;
3663 inf_status->trap_expected = trap_expected;
3664 inf_status->step_range_start = step_range_start;
3665 inf_status->step_range_end = step_range_end;
3666 inf_status->step_frame_id = step_frame_id;
3667 inf_status->step_over_calls = step_over_calls;
3668 inf_status->stop_after_trap = stop_after_trap;
3669 inf_status->stop_soon_quietly = stop_soon_quietly;
3670 /* Save original bpstat chain here; replace it with copy of chain.
3671 If caller's caller is walking the chain, they'll be happier if we
3672 hand them back the original chain when restore_inferior_status is
3674 inf_status->stop_bpstat = stop_bpstat;
3675 stop_bpstat = bpstat_copy (stop_bpstat);
3676 inf_status->breakpoint_proceeded = breakpoint_proceeded;
3677 inf_status->restore_stack_info = restore_stack_info;
3678 inf_status->proceed_to_finish = proceed_to_finish;
3680 inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers);
3682 inf_status->registers = regcache_dup (current_regcache);
3684 inf_status->selected_frame_id = get_frame_id (deprecated_selected_frame);
3689 restore_selected_frame (void *args)
3691 struct frame_id *fid = (struct frame_id *) args;
3692 struct frame_info *frame;
3694 frame = frame_find_by_id (*fid);
3696 /* If inf_status->selected_frame_id is NULL, there was no previously
3700 warning ("Unable to restore previously selected frame.\n");
3704 select_frame (frame);
3710 restore_inferior_status (struct inferior_status *inf_status)
3712 stop_signal = inf_status->stop_signal;
3713 stop_pc = inf_status->stop_pc;
3714 stop_step = inf_status->stop_step;
3715 stop_stack_dummy = inf_status->stop_stack_dummy;
3716 stopped_by_random_signal = inf_status->stopped_by_random_signal;
3717 trap_expected = inf_status->trap_expected;
3718 step_range_start = inf_status->step_range_start;
3719 step_range_end = inf_status->step_range_end;
3720 step_frame_id = inf_status->step_frame_id;
3721 step_over_calls = inf_status->step_over_calls;
3722 stop_after_trap = inf_status->stop_after_trap;
3723 stop_soon_quietly = inf_status->stop_soon_quietly;
3724 bpstat_clear (&stop_bpstat);
3725 stop_bpstat = inf_status->stop_bpstat;
3726 breakpoint_proceeded = inf_status->breakpoint_proceeded;
3727 proceed_to_finish = inf_status->proceed_to_finish;
3729 /* FIXME: Is the restore of stop_registers always needed. */
3730 regcache_xfree (stop_registers);
3731 stop_registers = inf_status->stop_registers;
3733 /* The inferior can be gone if the user types "print exit(0)"
3734 (and perhaps other times). */
3735 if (target_has_execution)
3736 /* NB: The register write goes through to the target. */
3737 regcache_cpy (current_regcache, inf_status->registers);
3738 regcache_xfree (inf_status->registers);
3740 /* FIXME: If we are being called after stopping in a function which
3741 is called from gdb, we should not be trying to restore the
3742 selected frame; it just prints a spurious error message (The
3743 message is useful, however, in detecting bugs in gdb (like if gdb
3744 clobbers the stack)). In fact, should we be restoring the
3745 inferior status at all in that case? . */
3747 if (target_has_stack && inf_status->restore_stack_info)
3749 /* The point of catch_errors is that if the stack is clobbered,
3750 walking the stack might encounter a garbage pointer and
3751 error() trying to dereference it. */
3753 (restore_selected_frame, &inf_status->selected_frame_id,
3754 "Unable to restore previously selected frame:\n",
3755 RETURN_MASK_ERROR) == 0)
3756 /* Error in restoring the selected frame. Select the innermost
3758 select_frame (get_current_frame ());
3766 do_restore_inferior_status_cleanup (void *sts)
3768 restore_inferior_status (sts);
3772 make_cleanup_restore_inferior_status (struct inferior_status *inf_status)
3774 return make_cleanup (do_restore_inferior_status_cleanup, inf_status);
3778 discard_inferior_status (struct inferior_status *inf_status)
3780 /* See save_inferior_status for info on stop_bpstat. */
3781 bpstat_clear (&inf_status->stop_bpstat);
3782 regcache_xfree (inf_status->registers);
3783 regcache_xfree (inf_status->stop_registers);
3788 inferior_has_forked (int pid, int *child_pid)
3790 struct target_waitstatus last;
3793 get_last_target_status (&last_ptid, &last);
3795 if (last.kind != TARGET_WAITKIND_FORKED)
3798 if (ptid_get_pid (last_ptid) != pid)
3801 *child_pid = last.value.related_pid;
3806 inferior_has_vforked (int pid, int *child_pid)
3808 struct target_waitstatus last;
3811 get_last_target_status (&last_ptid, &last);
3813 if (last.kind != TARGET_WAITKIND_VFORKED)
3816 if (ptid_get_pid (last_ptid) != pid)
3819 *child_pid = last.value.related_pid;
3824 inferior_has_execd (int pid, char **execd_pathname)
3826 struct target_waitstatus last;
3829 get_last_target_status (&last_ptid, &last);
3831 if (last.kind != TARGET_WAITKIND_EXECD)
3834 if (ptid_get_pid (last_ptid) != pid)
3837 *execd_pathname = xstrdup (last.value.execd_pathname);
3841 /* Oft used ptids */
3843 ptid_t minus_one_ptid;
3845 /* Create a ptid given the necessary PID, LWP, and TID components. */
3848 ptid_build (int pid, long lwp, long tid)
3858 /* Create a ptid from just a pid. */
3861 pid_to_ptid (int pid)
3863 return ptid_build (pid, 0, 0);
3866 /* Fetch the pid (process id) component from a ptid. */
3869 ptid_get_pid (ptid_t ptid)
3874 /* Fetch the lwp (lightweight process) component from a ptid. */
3877 ptid_get_lwp (ptid_t ptid)
3882 /* Fetch the tid (thread id) component from a ptid. */
3885 ptid_get_tid (ptid_t ptid)
3890 /* ptid_equal() is used to test equality of two ptids. */
3893 ptid_equal (ptid_t ptid1, ptid_t ptid2)
3895 return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp
3896 && ptid1.tid == ptid2.tid);
3899 /* restore_inferior_ptid() will be used by the cleanup machinery
3900 to restore the inferior_ptid value saved in a call to
3901 save_inferior_ptid(). */
3904 restore_inferior_ptid (void *arg)
3906 ptid_t *saved_ptid_ptr = arg;
3907 inferior_ptid = *saved_ptid_ptr;
3911 /* Save the value of inferior_ptid so that it may be restored by a
3912 later call to do_cleanups(). Returns the struct cleanup pointer
3913 needed for later doing the cleanup. */
3916 save_inferior_ptid (void)
3918 ptid_t *saved_ptid_ptr;
3920 saved_ptid_ptr = xmalloc (sizeof (ptid_t));
3921 *saved_ptid_ptr = inferior_ptid;
3922 return make_cleanup (restore_inferior_ptid, saved_ptid_ptr);
3929 stop_registers = regcache_xmalloc (current_gdbarch);
3933 _initialize_infrun (void)
3936 register int numsigs;
3937 struct cmd_list_element *c;
3939 register_gdbarch_swap (&stop_registers, sizeof (stop_registers), NULL);
3940 register_gdbarch_swap (NULL, 0, build_infrun);
3942 add_info ("signals", signals_info,
3943 "What debugger does when program gets various signals.\n\
3944 Specify a signal as argument to print info on that signal only.");
3945 add_info_alias ("handle", "signals", 0);
3947 add_com ("handle", class_run, handle_command,
3948 concat ("Specify how to handle a signal.\n\
3949 Args are signals and actions to apply to those signals.\n\
3950 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3951 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3952 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3953 The special arg \"all\" is recognized to mean all signals except those\n\
3954 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3955 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3956 Stop means reenter debugger if this signal happens (implies print).\n\
3957 Print means print a message if this signal happens.\n\
3958 Pass means let program see this signal; otherwise program doesn't know.\n\
3959 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3960 Pass and Stop may be combined.", NULL));
3963 add_com ("lz", class_info, signals_info,
3964 "What debugger does when program gets various signals.\n\
3965 Specify a signal as argument to print info on that signal only.");
3966 add_com ("z", class_run, xdb_handle_command,
3967 concat ("Specify how to handle a signal.\n\
3968 Args are signals and actions to apply to those signals.\n\
3969 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3970 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3971 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3972 The special arg \"all\" is recognized to mean all signals except those\n\
3973 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\
3974 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
3975 nopass), \"Q\" (noprint)\n\
3976 Stop means reenter debugger if this signal happens (implies print).\n\
3977 Print means print a message if this signal happens.\n\
3978 Pass means let program see this signal; otherwise program doesn't know.\n\
3979 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3980 Pass and Stop may be combined.", NULL));
3985 add_cmd ("stop", class_obscure, not_just_help_class_command, "There is no `stop' command, but you can set a hook on `stop'.\n\
3986 This allows you to set a list of commands to be run each time execution\n\
3987 of the program stops.", &cmdlist);
3989 numsigs = (int) TARGET_SIGNAL_LAST;
3990 signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs);
3991 signal_print = (unsigned char *)
3992 xmalloc (sizeof (signal_print[0]) * numsigs);
3993 signal_program = (unsigned char *)
3994 xmalloc (sizeof (signal_program[0]) * numsigs);
3995 for (i = 0; i < numsigs; i++)
3998 signal_print[i] = 1;
3999 signal_program[i] = 1;
4002 /* Signals caused by debugger's own actions
4003 should not be given to the program afterwards. */
4004 signal_program[TARGET_SIGNAL_TRAP] = 0;
4005 signal_program[TARGET_SIGNAL_INT] = 0;
4007 /* Signals that are not errors should not normally enter the debugger. */
4008 signal_stop[TARGET_SIGNAL_ALRM] = 0;
4009 signal_print[TARGET_SIGNAL_ALRM] = 0;
4010 signal_stop[TARGET_SIGNAL_VTALRM] = 0;
4011 signal_print[TARGET_SIGNAL_VTALRM] = 0;
4012 signal_stop[TARGET_SIGNAL_PROF] = 0;
4013 signal_print[TARGET_SIGNAL_PROF] = 0;
4014 signal_stop[TARGET_SIGNAL_CHLD] = 0;
4015 signal_print[TARGET_SIGNAL_CHLD] = 0;
4016 signal_stop[TARGET_SIGNAL_IO] = 0;
4017 signal_print[TARGET_SIGNAL_IO] = 0;
4018 signal_stop[TARGET_SIGNAL_POLL] = 0;
4019 signal_print[TARGET_SIGNAL_POLL] = 0;
4020 signal_stop[TARGET_SIGNAL_URG] = 0;
4021 signal_print[TARGET_SIGNAL_URG] = 0;
4022 signal_stop[TARGET_SIGNAL_WINCH] = 0;
4023 signal_print[TARGET_SIGNAL_WINCH] = 0;
4025 /* These signals are used internally by user-level thread
4026 implementations. (See signal(5) on Solaris.) Like the above
4027 signals, a healthy program receives and handles them as part of
4028 its normal operation. */
4029 signal_stop[TARGET_SIGNAL_LWP] = 0;
4030 signal_print[TARGET_SIGNAL_LWP] = 0;
4031 signal_stop[TARGET_SIGNAL_WAITING] = 0;
4032 signal_print[TARGET_SIGNAL_WAITING] = 0;
4033 signal_stop[TARGET_SIGNAL_CANCEL] = 0;
4034 signal_print[TARGET_SIGNAL_CANCEL] = 0;
4038 (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger,
4039 (char *) &stop_on_solib_events,
4040 "Set stopping for shared library events.\n\
4041 If nonzero, gdb will give control to the user when the dynamic linker\n\
4042 notifies gdb of shared library events. The most common event of interest\n\
4043 to the user would be loading/unloading of a new library.\n", &setlist), &showlist);
4046 c = add_set_enum_cmd ("follow-fork-mode",
4048 follow_fork_mode_kind_names, &follow_fork_mode_string,
4049 /* ??rehrauer: The "both" option is broken, by what may be a 10.20
4050 kernel problem. It's also not terribly useful without a GUI to
4051 help the user drive two debuggers. So for now, I'm disabling
4052 the "both" option. */
4053 /* "Set debugger response to a program call of fork \
4055 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4056 parent - the original process is debugged after a fork\n\
4057 child - the new process is debugged after a fork\n\
4058 both - both the parent and child are debugged after a fork\n\
4059 ask - the debugger will ask for one of the above choices\n\
4060 For \"both\", another copy of the debugger will be started to follow\n\
4061 the new child process. The original debugger will continue to follow\n\
4062 the original parent process. To distinguish their prompts, the\n\
4063 debugger copy's prompt will be changed.\n\
4064 For \"parent\" or \"child\", the unfollowed process will run free.\n\
4065 By default, the debugger will follow the parent process.",
4067 "Set debugger response to a program call of fork \
4069 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4070 parent - the original process is debugged after a fork\n\
4071 child - the new process is debugged after a fork\n\
4072 ask - the debugger will ask for one of the above choices\n\
4073 For \"parent\" or \"child\", the unfollowed process will run free.\n\
4074 By default, the debugger will follow the parent process.", &setlist);
4075 add_show_from_set (c, &showlist);
4077 c = add_set_enum_cmd ("scheduler-locking", class_run, scheduler_enums, /* array of string names */
4078 &scheduler_mode, /* current mode */
4079 "Set mode for locking scheduler during execution.\n\
4080 off == no locking (threads may preempt at any time)\n\
4081 on == full locking (no thread except the current thread may run)\n\
4082 step == scheduler locked during every single-step operation.\n\
4083 In this mode, no other thread may run during a step command.\n\
4084 Other threads may run while stepping over a function call ('next').", &setlist);
4086 set_cmd_sfunc (c, set_schedlock_func); /* traps on target vector */
4087 add_show_from_set (c, &showlist);
4089 c = add_set_cmd ("step-mode", class_run,
4090 var_boolean, (char *) &step_stop_if_no_debug,
4091 "Set mode of the step operation. When set, doing a step over a\n\
4092 function without debug line information will stop at the first\n\
4093 instruction of that function. Otherwise, the function is skipped and\n\
4094 the step command stops at a different source line.", &setlist);
4095 add_show_from_set (c, &showlist);
4097 /* ptid initializations */
4098 null_ptid = ptid_build (0, 0, 0);
4099 minus_one_ptid = ptid_build (-1, 0, 0);
4100 inferior_ptid = null_ptid;
4101 target_last_wait_ptid = minus_one_ptid;