1 /* Target-struct-independent code to start (run) and stop an inferior
4 Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
5 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free Software
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 59 Temple Place - Suite 330,
23 Boston, MA 02111-1307, USA. */
26 #include "gdb_string.h"
31 #include "breakpoint.h"
35 #include "cli/cli-script.h"
37 #include "gdbthread.h"
48 /* Prototypes for local functions */
50 static void signals_info (char *, int);
52 static void handle_command (char *, int);
54 static void sig_print_info (enum target_signal);
56 static void sig_print_header (void);
58 static void resume_cleanups (void *);
60 static int hook_stop_stub (void *);
62 static void delete_breakpoint_current_contents (void *);
64 static void set_follow_fork_mode_command (char *arg, int from_tty,
65 struct cmd_list_element *c);
67 static int restore_selected_frame (void *);
69 static void build_infrun (void);
71 static int follow_fork (void);
73 static void set_schedlock_func (char *args, int from_tty,
74 struct cmd_list_element *c);
76 struct execution_control_state;
78 static int currently_stepping (struct execution_control_state *ecs);
80 static void xdb_handle_command (char *args, int from_tty);
82 static int prepare_to_proceed (void);
84 void _initialize_infrun (void);
86 int inferior_ignoring_startup_exec_events = 0;
87 int inferior_ignoring_leading_exec_events = 0;
89 /* When set, stop the 'step' command if we enter a function which has
90 no line number information. The normal behavior is that we step
91 over such function. */
92 int step_stop_if_no_debug = 0;
94 /* In asynchronous mode, but simulating synchronous execution. */
96 int sync_execution = 0;
98 /* wait_for_inferior and normal_stop use this to notify the user
99 when the inferior stopped in a different thread than it had been
102 static ptid_t previous_inferior_ptid;
104 /* This is true for configurations that may follow through execl() and
105 similar functions. At present this is only true for HP-UX native. */
107 #ifndef MAY_FOLLOW_EXEC
108 #define MAY_FOLLOW_EXEC (0)
111 static int may_follow_exec = MAY_FOLLOW_EXEC;
113 /* If the program uses ELF-style shared libraries, then calls to
114 functions in shared libraries go through stubs, which live in a
115 table called the PLT (Procedure Linkage Table). The first time the
116 function is called, the stub sends control to the dynamic linker,
117 which looks up the function's real address, patches the stub so
118 that future calls will go directly to the function, and then passes
119 control to the function.
121 If we are stepping at the source level, we don't want to see any of
122 this --- we just want to skip over the stub and the dynamic linker.
123 The simple approach is to single-step until control leaves the
126 However, on some systems (e.g., Red Hat's 5.2 distribution) the
127 dynamic linker calls functions in the shared C library, so you
128 can't tell from the PC alone whether the dynamic linker is still
129 running. In this case, we use a step-resume breakpoint to get us
130 past the dynamic linker, as if we were using "next" to step over a
133 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
134 linker code or not. Normally, this means we single-step. However,
135 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
136 address where we can place a step-resume breakpoint to get past the
137 linker's symbol resolution function.
139 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
140 pretty portable way, by comparing the PC against the address ranges
141 of the dynamic linker's sections.
143 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
144 it depends on internal details of the dynamic linker. It's usually
145 not too hard to figure out where to put a breakpoint, but it
146 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
147 sanity checking. If it can't figure things out, returning zero and
148 getting the (possibly confusing) stepping behavior is better than
149 signalling an error, which will obscure the change in the
152 #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE
153 #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0
156 /* This function returns TRUE if pc is the address of an instruction
157 that lies within the dynamic linker (such as the event hook, or the
160 This function must be used only when a dynamic linker event has
161 been caught, and the inferior is being stepped out of the hook, or
162 undefined results are guaranteed. */
164 #ifndef SOLIB_IN_DYNAMIC_LINKER
165 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
168 /* On MIPS16, a function that returns a floating point value may call
169 a library helper function to copy the return value to a floating point
170 register. The IGNORE_HELPER_CALL macro returns non-zero if we
171 should ignore (i.e. step over) this function call. */
172 #ifndef IGNORE_HELPER_CALL
173 #define IGNORE_HELPER_CALL(pc) 0
176 /* On some systems, the PC may be left pointing at an instruction that won't
177 actually be executed. This is usually indicated by a bit in the PSW. If
178 we find ourselves in such a state, then we step the target beyond the
179 nullified instruction before returning control to the user so as to avoid
182 #ifndef INSTRUCTION_NULLIFIED
183 #define INSTRUCTION_NULLIFIED 0
186 /* We can't step off a permanent breakpoint in the ordinary way, because we
187 can't remove it. Instead, we have to advance the PC to the next
188 instruction. This macro should expand to a pointer to a function that
189 does that, or zero if we have no such function. If we don't have a
190 definition for it, we have to report an error. */
191 #ifndef SKIP_PERMANENT_BREAKPOINT
192 #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint)
194 default_skip_permanent_breakpoint (void)
197 The program is stopped at a permanent breakpoint, but GDB does not know\n\
198 how to step past a permanent breakpoint on this architecture. Try using\n\
199 a command like `return' or `jump' to continue execution.");
204 /* Convert the #defines into values. This is temporary until wfi control
205 flow is completely sorted out. */
207 #ifndef HAVE_STEPPABLE_WATCHPOINT
208 #define HAVE_STEPPABLE_WATCHPOINT 0
210 #undef HAVE_STEPPABLE_WATCHPOINT
211 #define HAVE_STEPPABLE_WATCHPOINT 1
214 #ifndef CANNOT_STEP_HW_WATCHPOINTS
215 #define CANNOT_STEP_HW_WATCHPOINTS 0
217 #undef CANNOT_STEP_HW_WATCHPOINTS
218 #define CANNOT_STEP_HW_WATCHPOINTS 1
221 /* Tables of how to react to signals; the user sets them. */
223 static unsigned char *signal_stop;
224 static unsigned char *signal_print;
225 static unsigned char *signal_program;
227 #define SET_SIGS(nsigs,sigs,flags) \
229 int signum = (nsigs); \
230 while (signum-- > 0) \
231 if ((sigs)[signum]) \
232 (flags)[signum] = 1; \
235 #define UNSET_SIGS(nsigs,sigs,flags) \
237 int signum = (nsigs); \
238 while (signum-- > 0) \
239 if ((sigs)[signum]) \
240 (flags)[signum] = 0; \
243 /* Value to pass to target_resume() to cause all threads to resume */
245 #define RESUME_ALL (pid_to_ptid (-1))
247 /* Command list pointer for the "stop" placeholder. */
249 static struct cmd_list_element *stop_command;
251 /* Nonzero if breakpoints are now inserted in the inferior. */
253 static int breakpoints_inserted;
255 /* Function inferior was in as of last step command. */
257 static struct symbol *step_start_function;
259 /* Nonzero if we are expecting a trace trap and should proceed from it. */
261 static int trap_expected;
264 /* Nonzero if we want to give control to the user when we're notified
265 of shared library events by the dynamic linker. */
266 static int stop_on_solib_events;
270 /* Nonzero if the next time we try to continue the inferior, it will
271 step one instruction and generate a spurious trace trap.
272 This is used to compensate for a bug in HP-UX. */
274 static int trap_expected_after_continue;
277 /* Nonzero means expecting a trace trap
278 and should stop the inferior and return silently when it happens. */
282 /* Nonzero means expecting a trap and caller will handle it themselves.
283 It is used after attach, due to attaching to a process;
284 when running in the shell before the child program has been exec'd;
285 and when running some kinds of remote stuff (FIXME?). */
287 enum stop_kind stop_soon;
289 /* Nonzero if proceed is being used for a "finish" command or a similar
290 situation when stop_registers should be saved. */
292 int proceed_to_finish;
294 /* Save register contents here when about to pop a stack dummy frame,
295 if-and-only-if proceed_to_finish is set.
296 Thus this contains the return value from the called function (assuming
297 values are returned in a register). */
299 struct regcache *stop_registers;
301 /* Nonzero if program stopped due to error trying to insert breakpoints. */
303 static int breakpoints_failed;
305 /* Nonzero after stop if current stack frame should be printed. */
307 static int stop_print_frame;
309 static struct breakpoint *step_resume_breakpoint = NULL;
310 static struct breakpoint *through_sigtramp_breakpoint = NULL;
312 /* On some platforms (e.g., HP-UX), hardware watchpoints have bad
313 interactions with an inferior that is running a kernel function
314 (aka, a system call or "syscall"). wait_for_inferior therefore
315 may have a need to know when the inferior is in a syscall. This
316 is a count of the number of inferior threads which are known to
317 currently be running in a syscall. */
318 static int number_of_threads_in_syscalls;
320 /* This is a cached copy of the pid/waitstatus of the last event
321 returned by target_wait()/target_wait_hook(). This information is
322 returned by get_last_target_status(). */
323 static ptid_t target_last_wait_ptid;
324 static struct target_waitstatus target_last_waitstatus;
326 /* This is used to remember when a fork, vfork or exec event
327 was caught by a catchpoint, and thus the event is to be
328 followed at the next resume of the inferior, and not
332 enum target_waitkind kind;
339 char *execd_pathname;
343 static const char follow_fork_mode_ask[] = "ask";
344 static const char follow_fork_mode_child[] = "child";
345 static const char follow_fork_mode_parent[] = "parent";
347 static const char *follow_fork_mode_kind_names[] = {
348 follow_fork_mode_ask,
349 follow_fork_mode_child,
350 follow_fork_mode_parent,
354 static const char *follow_fork_mode_string = follow_fork_mode_parent;
360 const char *follow_mode = follow_fork_mode_string;
361 int follow_child = (follow_mode == follow_fork_mode_child);
363 /* Or, did the user not know, and want us to ask? */
364 if (follow_fork_mode_string == follow_fork_mode_ask)
366 internal_error (__FILE__, __LINE__,
367 "follow_inferior_fork: \"ask\" mode not implemented");
368 /* follow_mode = follow_fork_mode_...; */
371 return target_follow_fork (follow_child);
375 follow_inferior_reset_breakpoints (void)
377 /* Was there a step_resume breakpoint? (There was if the user
378 did a "next" at the fork() call.) If so, explicitly reset its
381 step_resumes are a form of bp that are made to be per-thread.
382 Since we created the step_resume bp when the parent process
383 was being debugged, and now are switching to the child process,
384 from the breakpoint package's viewpoint, that's a switch of
385 "threads". We must update the bp's notion of which thread
386 it is for, or it'll be ignored when it triggers. */
388 if (step_resume_breakpoint)
389 breakpoint_re_set_thread (step_resume_breakpoint);
391 /* Reinsert all breakpoints in the child. The user may have set
392 breakpoints after catching the fork, in which case those
393 were never set in the child, but only in the parent. This makes
394 sure the inserted breakpoints match the breakpoint list. */
396 breakpoint_re_set ();
397 insert_breakpoints ();
400 /* EXECD_PATHNAME is assumed to be non-NULL. */
403 follow_exec (int pid, char *execd_pathname)
406 struct target_ops *tgt;
408 if (!may_follow_exec)
411 /* This is an exec event that we actually wish to pay attention to.
412 Refresh our symbol table to the newly exec'd program, remove any
415 If there are breakpoints, they aren't really inserted now,
416 since the exec() transformed our inferior into a fresh set
419 We want to preserve symbolic breakpoints on the list, since
420 we have hopes that they can be reset after the new a.out's
421 symbol table is read.
423 However, any "raw" breakpoints must be removed from the list
424 (e.g., the solib bp's), since their address is probably invalid
427 And, we DON'T want to call delete_breakpoints() here, since
428 that may write the bp's "shadow contents" (the instruction
429 value that was overwritten witha TRAP instruction). Since
430 we now have a new a.out, those shadow contents aren't valid. */
431 update_breakpoints_after_exec ();
433 /* If there was one, it's gone now. We cannot truly step-to-next
434 statement through an exec(). */
435 step_resume_breakpoint = NULL;
436 step_range_start = 0;
439 /* If there was one, it's gone now. */
440 through_sigtramp_breakpoint = NULL;
442 /* What is this a.out's name? */
443 printf_unfiltered ("Executing new program: %s\n", execd_pathname);
445 /* We've followed the inferior through an exec. Therefore, the
446 inferior has essentially been killed & reborn. */
448 /* First collect the run target in effect. */
449 tgt = find_run_target ();
450 /* If we can't find one, things are in a very strange state... */
452 error ("Could find run target to save before following exec");
454 gdb_flush (gdb_stdout);
455 target_mourn_inferior ();
456 inferior_ptid = pid_to_ptid (saved_pid);
457 /* Because mourn_inferior resets inferior_ptid. */
460 /* That a.out is now the one to use. */
461 exec_file_attach (execd_pathname, 0);
463 /* And also is where symbols can be found. */
464 symbol_file_add_main (execd_pathname, 0);
466 /* Reset the shared library package. This ensures that we get
467 a shlib event when the child reaches "_start", at which point
468 the dld will have had a chance to initialize the child. */
469 #if defined(SOLIB_RESTART)
472 #ifdef SOLIB_CREATE_INFERIOR_HOOK
473 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid));
476 /* Reinsert all breakpoints. (Those which were symbolic have
477 been reset to the proper address in the new a.out, thanks
478 to symbol_file_command...) */
479 insert_breakpoints ();
481 /* The next resume of this inferior should bring it to the shlib
482 startup breakpoints. (If the user had also set bp's on
483 "main" from the old (parent) process, then they'll auto-
484 matically get reset there in the new process.) */
487 /* Non-zero if we just simulating a single-step. This is needed
488 because we cannot remove the breakpoints in the inferior process
489 until after the `wait' in `wait_for_inferior'. */
490 static int singlestep_breakpoints_inserted_p = 0;
493 /* Things to clean up if we QUIT out of resume (). */
495 resume_cleanups (void *ignore)
500 static const char schedlock_off[] = "off";
501 static const char schedlock_on[] = "on";
502 static const char schedlock_step[] = "step";
503 static const char *scheduler_mode = schedlock_off;
504 static const char *scheduler_enums[] = {
512 set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c)
514 /* NOTE: cagney/2002-03-17: The add_show_from_set() function clones
515 the set command passed as a parameter. The clone operation will
516 include (BUG?) any ``set'' command callback, if present.
517 Commands like ``info set'' call all the ``show'' command
518 callbacks. Unfortunately, for ``show'' commands cloned from
519 ``set'', this includes callbacks belonging to ``set'' commands.
520 Making this worse, this only occures if add_show_from_set() is
521 called after add_cmd_sfunc() (BUG?). */
522 if (cmd_type (c) == set_cmd)
523 if (!target_can_lock_scheduler)
525 scheduler_mode = schedlock_off;
526 error ("Target '%s' cannot support this command.", target_shortname);
531 /* Resume the inferior, but allow a QUIT. This is useful if the user
532 wants to interrupt some lengthy single-stepping operation
533 (for child processes, the SIGINT goes to the inferior, and so
534 we get a SIGINT random_signal, but for remote debugging and perhaps
535 other targets, that's not true).
537 STEP nonzero if we should step (zero to continue instead).
538 SIG is the signal to give the inferior (zero for none). */
540 resume (int step, enum target_signal sig)
542 int should_resume = 1;
543 struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0);
546 /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */
549 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
550 over an instruction that causes a page fault without triggering
551 a hardware watchpoint. The kernel properly notices that it shouldn't
552 stop, because the hardware watchpoint is not triggered, but it forgets
553 the step request and continues the program normally.
554 Work around the problem by removing hardware watchpoints if a step is
555 requested, GDB will check for a hardware watchpoint trigger after the
557 if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted)
558 remove_hw_watchpoints ();
561 /* Normally, by the time we reach `resume', the breakpoints are either
562 removed or inserted, as appropriate. The exception is if we're sitting
563 at a permanent breakpoint; we need to step over it, but permanent
564 breakpoints can't be removed. So we have to test for it here. */
565 if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here)
566 SKIP_PERMANENT_BREAKPOINT ();
568 if (SOFTWARE_SINGLE_STEP_P () && step)
570 /* Do it the hard way, w/temp breakpoints */
571 SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ );
572 /* ...and don't ask hardware to do it. */
574 /* and do not pull these breakpoints until after a `wait' in
575 `wait_for_inferior' */
576 singlestep_breakpoints_inserted_p = 1;
579 /* Handle any optimized stores to the inferior NOW... */
580 #ifdef DO_DEFERRED_STORES
584 /* If there were any forks/vforks/execs that were caught and are
585 now to be followed, then do so. */
586 switch (pending_follow.kind)
588 case TARGET_WAITKIND_FORKED:
589 case TARGET_WAITKIND_VFORKED:
590 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
595 case TARGET_WAITKIND_EXECD:
596 /* follow_exec is called as soon as the exec event is seen. */
597 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
604 /* Install inferior's terminal modes. */
605 target_terminal_inferior ();
611 resume_ptid = RESUME_ALL; /* Default */
613 if ((step || singlestep_breakpoints_inserted_p) &&
614 !breakpoints_inserted && breakpoint_here_p (read_pc ()))
616 /* Stepping past a breakpoint without inserting breakpoints.
617 Make sure only the current thread gets to step, so that
618 other threads don't sneak past breakpoints while they are
621 resume_ptid = inferior_ptid;
624 if ((scheduler_mode == schedlock_on) ||
625 (scheduler_mode == schedlock_step &&
626 (step || singlestep_breakpoints_inserted_p)))
628 /* User-settable 'scheduler' mode requires solo thread resume. */
629 resume_ptid = inferior_ptid;
632 if (CANNOT_STEP_BREAKPOINT)
634 /* Most targets can step a breakpoint instruction, thus
635 executing it normally. But if this one cannot, just
636 continue and we will hit it anyway. */
637 if (step && breakpoints_inserted && breakpoint_here_p (read_pc ()))
640 target_resume (resume_ptid, step, sig);
643 discard_cleanups (old_cleanups);
647 /* Clear out all variables saying what to do when inferior is continued.
648 First do this, then set the ones you want, then call `proceed'. */
651 clear_proceed_status (void)
654 step_range_start = 0;
656 step_frame_id = null_frame_id;
657 step_over_calls = STEP_OVER_UNDEBUGGABLE;
659 stop_soon = NO_STOP_QUIETLY;
660 proceed_to_finish = 0;
661 breakpoint_proceeded = 1; /* We're about to proceed... */
663 /* Discard any remaining commands or status from previous stop. */
664 bpstat_clear (&stop_bpstat);
667 /* This should be suitable for any targets that support threads. */
670 prepare_to_proceed (void)
673 struct target_waitstatus wait_status;
675 /* Get the last target status returned by target_wait(). */
676 get_last_target_status (&wait_ptid, &wait_status);
678 /* Make sure we were stopped either at a breakpoint, or because
680 if (wait_status.kind != TARGET_WAITKIND_STOPPED
681 || (wait_status.value.sig != TARGET_SIGNAL_TRAP &&
682 wait_status.value.sig != TARGET_SIGNAL_INT))
687 if (!ptid_equal (wait_ptid, minus_one_ptid)
688 && !ptid_equal (inferior_ptid, wait_ptid))
690 /* Switched over from WAIT_PID. */
691 CORE_ADDR wait_pc = read_pc_pid (wait_ptid);
693 if (wait_pc != read_pc ())
695 /* Switch back to WAIT_PID thread. */
696 inferior_ptid = wait_ptid;
698 /* FIXME: This stuff came from switch_to_thread() in
699 thread.c (which should probably be a public function). */
700 flush_cached_frames ();
701 registers_changed ();
703 select_frame (get_current_frame ());
706 /* We return 1 to indicate that there is a breakpoint here,
707 so we need to step over it before continuing to avoid
708 hitting it straight away. */
709 if (breakpoint_here_p (wait_pc))
717 /* Record the pc of the program the last time it stopped. This is
718 just used internally by wait_for_inferior, but need to be preserved
719 over calls to it and cleared when the inferior is started. */
720 static CORE_ADDR prev_pc;
722 /* Basic routine for continuing the program in various fashions.
724 ADDR is the address to resume at, or -1 for resume where stopped.
725 SIGGNAL is the signal to give it, or 0 for none,
726 or -1 for act according to how it stopped.
727 STEP is nonzero if should trap after one instruction.
728 -1 means return after that and print nothing.
729 You should probably set various step_... variables
730 before calling here, if you are stepping.
732 You should call clear_proceed_status before calling proceed. */
735 proceed (CORE_ADDR addr, enum target_signal siggnal, int step)
740 step_start_function = find_pc_function (read_pc ());
744 if (addr == (CORE_ADDR) -1)
746 /* If there is a breakpoint at the address we will resume at,
747 step one instruction before inserting breakpoints
748 so that we do not stop right away (and report a second
749 hit at this breakpoint). */
751 if (read_pc () == stop_pc && breakpoint_here_p (read_pc ()))
754 #ifndef STEP_SKIPS_DELAY
755 #define STEP_SKIPS_DELAY(pc) (0)
756 #define STEP_SKIPS_DELAY_P (0)
758 /* Check breakpoint_here_p first, because breakpoint_here_p is fast
759 (it just checks internal GDB data structures) and STEP_SKIPS_DELAY
760 is slow (it needs to read memory from the target). */
761 if (STEP_SKIPS_DELAY_P
762 && breakpoint_here_p (read_pc () + 4)
763 && STEP_SKIPS_DELAY (read_pc ()))
771 /* In a multi-threaded task we may select another thread
772 and then continue or step.
774 But if the old thread was stopped at a breakpoint, it
775 will immediately cause another breakpoint stop without
776 any execution (i.e. it will report a breakpoint hit
777 incorrectly). So we must step over it first.
779 prepare_to_proceed checks the current thread against the thread
780 that reported the most recent event. If a step-over is required
781 it returns TRUE and sets the current thread to the old thread. */
782 if (prepare_to_proceed () && breakpoint_here_p (read_pc ()))
786 if (trap_expected_after_continue)
788 /* If (step == 0), a trap will be automatically generated after
789 the first instruction is executed. Force step one
790 instruction to clear this condition. This should not occur
791 if step is nonzero, but it is harmless in that case. */
793 trap_expected_after_continue = 0;
795 #endif /* HP_OS_BUG */
798 /* We will get a trace trap after one instruction.
799 Continue it automatically and insert breakpoints then. */
803 insert_breakpoints ();
804 /* If we get here there was no call to error() in
805 insert breakpoints -- so they were inserted. */
806 breakpoints_inserted = 1;
809 if (siggnal != TARGET_SIGNAL_DEFAULT)
810 stop_signal = siggnal;
811 /* If this signal should not be seen by program,
812 give it zero. Used for debugging signals. */
813 else if (!signal_program[stop_signal])
814 stop_signal = TARGET_SIGNAL_0;
816 annotate_starting ();
818 /* Make sure that output from GDB appears before output from the
820 gdb_flush (gdb_stdout);
822 /* Refresh prev_pc value just prior to resuming. This used to be
823 done in stop_stepping, however, setting prev_pc there did not handle
824 scenarios such as inferior function calls or returning from
825 a function via the return command. In those cases, the prev_pc
826 value was not set properly for subsequent commands. The prev_pc value
827 is used to initialize the starting line number in the ecs. With an
828 invalid value, the gdb next command ends up stopping at the position
829 represented by the next line table entry past our start position.
830 On platforms that generate one line table entry per line, this
831 is not a problem. However, on the ia64, the compiler generates
832 extraneous line table entries that do not increase the line number.
833 When we issue the gdb next command on the ia64 after an inferior call
834 or a return command, we often end up a few instructions forward, still
835 within the original line we started.
837 An attempt was made to have init_execution_control_state () refresh
838 the prev_pc value before calculating the line number. This approach
839 did not work because on platforms that use ptrace, the pc register
840 cannot be read unless the inferior is stopped. At that point, we
841 are not guaranteed the inferior is stopped and so the read_pc ()
842 call can fail. Setting the prev_pc value here ensures the value is
843 updated correctly when the inferior is stopped. */
844 prev_pc = read_pc ();
846 /* Resume inferior. */
847 resume (oneproc || step || bpstat_should_step (), stop_signal);
849 /* Wait for it to stop (if not standalone)
850 and in any case decode why it stopped, and act accordingly. */
851 /* Do this only if we are not using the event loop, or if the target
852 does not support asynchronous execution. */
853 if (!event_loop_p || !target_can_async_p ())
855 wait_for_inferior ();
861 /* Start remote-debugging of a machine over a serial link. */
867 init_wait_for_inferior ();
868 stop_soon = STOP_QUIETLY;
871 /* Always go on waiting for the target, regardless of the mode. */
872 /* FIXME: cagney/1999-09-23: At present it isn't possible to
873 indicate to wait_for_inferior that a target should timeout if
874 nothing is returned (instead of just blocking). Because of this,
875 targets expecting an immediate response need to, internally, set
876 things up so that the target_wait() is forced to eventually
878 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
879 differentiate to its caller what the state of the target is after
880 the initial open has been performed. Here we're assuming that
881 the target has stopped. It should be possible to eventually have
882 target_open() return to the caller an indication that the target
883 is currently running and GDB state should be set to the same as
885 wait_for_inferior ();
889 /* Initialize static vars when a new inferior begins. */
892 init_wait_for_inferior (void)
894 /* These are meaningless until the first time through wait_for_inferior. */
898 trap_expected_after_continue = 0;
900 breakpoints_inserted = 0;
901 breakpoint_init_inferior (inf_starting);
903 /* Don't confuse first call to proceed(). */
904 stop_signal = TARGET_SIGNAL_0;
906 /* The first resume is not following a fork/vfork/exec. */
907 pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */
909 /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */
910 number_of_threads_in_syscalls = 0;
912 clear_proceed_status ();
916 delete_breakpoint_current_contents (void *arg)
918 struct breakpoint **breakpointp = (struct breakpoint **) arg;
919 if (*breakpointp != NULL)
921 delete_breakpoint (*breakpointp);
926 /* This enum encodes possible reasons for doing a target_wait, so that
927 wfi can call target_wait in one place. (Ultimately the call will be
928 moved out of the infinite loop entirely.) */
932 infwait_normal_state,
933 infwait_thread_hop_state,
934 infwait_nullified_state,
935 infwait_nonstep_watch_state
938 /* Why did the inferior stop? Used to print the appropriate messages
939 to the interface from within handle_inferior_event(). */
940 enum inferior_stop_reason
942 /* We don't know why. */
944 /* Step, next, nexti, stepi finished. */
946 /* Found breakpoint. */
948 /* Inferior terminated by signal. */
950 /* Inferior exited. */
952 /* Inferior received signal, and user asked to be notified. */
956 /* This structure contains what used to be local variables in
957 wait_for_inferior. Probably many of them can return to being
958 locals in handle_inferior_event. */
960 struct execution_control_state
962 struct target_waitstatus ws;
963 struct target_waitstatus *wp;
966 CORE_ADDR stop_func_start;
967 CORE_ADDR stop_func_end;
968 char *stop_func_name;
969 struct symtab_and_line sal;
970 int remove_breakpoints_on_following_step;
972 struct symtab *current_symtab;
973 int handling_longjmp; /* FIXME */
975 ptid_t saved_inferior_ptid;
977 int stepping_through_solib_after_catch;
978 bpstat stepping_through_solib_catchpoints;
979 int enable_hw_watchpoints_after_wait;
980 int stepping_through_sigtramp;
981 int new_thread_event;
982 struct target_waitstatus tmpstatus;
983 enum infwait_states infwait_state;
988 void init_execution_control_state (struct execution_control_state *ecs);
990 static void handle_step_into_function (struct execution_control_state *ecs,
991 CORE_ADDR real_stop_pc);
992 void handle_inferior_event (struct execution_control_state *ecs);
994 static void check_sigtramp2 (struct execution_control_state *ecs);
995 static void step_into_function (struct execution_control_state *ecs);
996 static void step_over_function (struct execution_control_state *ecs);
997 static void stop_stepping (struct execution_control_state *ecs);
998 static void prepare_to_wait (struct execution_control_state *ecs);
999 static void keep_going (struct execution_control_state *ecs);
1000 static void print_stop_reason (enum inferior_stop_reason stop_reason,
1003 /* Wait for control to return from inferior to debugger.
1004 If inferior gets a signal, we may decide to start it up again
1005 instead of returning. That is why there is a loop in this function.
1006 When this function actually returns it means the inferior
1007 should be left stopped and GDB should read more commands. */
1010 wait_for_inferior (void)
1012 struct cleanup *old_cleanups;
1013 struct execution_control_state ecss;
1014 struct execution_control_state *ecs;
1016 old_cleanups = make_cleanup (delete_step_resume_breakpoint,
1017 &step_resume_breakpoint);
1018 make_cleanup (delete_breakpoint_current_contents,
1019 &through_sigtramp_breakpoint);
1021 /* wfi still stays in a loop, so it's OK just to take the address of
1022 a local to get the ecs pointer. */
1025 /* Fill in with reasonable starting values. */
1026 init_execution_control_state (ecs);
1028 /* We'll update this if & when we switch to a new thread. */
1029 previous_inferior_ptid = inferior_ptid;
1031 overlay_cache_invalid = 1;
1033 /* We have to invalidate the registers BEFORE calling target_wait
1034 because they can be loaded from the target while in target_wait.
1035 This makes remote debugging a bit more efficient for those
1036 targets that provide critical registers as part of their normal
1037 status mechanism. */
1039 registers_changed ();
1043 if (target_wait_hook)
1044 ecs->ptid = target_wait_hook (ecs->waiton_ptid, ecs->wp);
1046 ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp);
1048 /* Now figure out what to do with the result of the result. */
1049 handle_inferior_event (ecs);
1051 if (!ecs->wait_some_more)
1054 do_cleanups (old_cleanups);
1057 /* Asynchronous version of wait_for_inferior. It is called by the
1058 event loop whenever a change of state is detected on the file
1059 descriptor corresponding to the target. It can be called more than
1060 once to complete a single execution command. In such cases we need
1061 to keep the state in a global variable ASYNC_ECSS. If it is the
1062 last time that this function is called for a single execution
1063 command, then report to the user that the inferior has stopped, and
1064 do the necessary cleanups. */
1066 struct execution_control_state async_ecss;
1067 struct execution_control_state *async_ecs;
1070 fetch_inferior_event (void *client_data)
1072 static struct cleanup *old_cleanups;
1074 async_ecs = &async_ecss;
1076 if (!async_ecs->wait_some_more)
1078 old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint,
1079 &step_resume_breakpoint);
1080 make_exec_cleanup (delete_breakpoint_current_contents,
1081 &through_sigtramp_breakpoint);
1083 /* Fill in with reasonable starting values. */
1084 init_execution_control_state (async_ecs);
1086 /* We'll update this if & when we switch to a new thread. */
1087 previous_inferior_ptid = inferior_ptid;
1089 overlay_cache_invalid = 1;
1091 /* We have to invalidate the registers BEFORE calling target_wait
1092 because they can be loaded from the target while in target_wait.
1093 This makes remote debugging a bit more efficient for those
1094 targets that provide critical registers as part of their normal
1095 status mechanism. */
1097 registers_changed ();
1100 if (target_wait_hook)
1102 target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp);
1104 async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp);
1106 /* Now figure out what to do with the result of the result. */
1107 handle_inferior_event (async_ecs);
1109 if (!async_ecs->wait_some_more)
1111 /* Do only the cleanups that have been added by this
1112 function. Let the continuations for the commands do the rest,
1113 if there are any. */
1114 do_exec_cleanups (old_cleanups);
1116 if (step_multi && stop_step)
1117 inferior_event_handler (INF_EXEC_CONTINUE, NULL);
1119 inferior_event_handler (INF_EXEC_COMPLETE, NULL);
1123 /* Prepare an execution control state for looping through a
1124 wait_for_inferior-type loop. */
1127 init_execution_control_state (struct execution_control_state *ecs)
1129 /* ecs->another_trap? */
1130 ecs->random_signal = 0;
1131 ecs->remove_breakpoints_on_following_step = 0;
1132 ecs->handling_longjmp = 0; /* FIXME */
1133 ecs->update_step_sp = 0;
1134 ecs->stepping_through_solib_after_catch = 0;
1135 ecs->stepping_through_solib_catchpoints = NULL;
1136 ecs->enable_hw_watchpoints_after_wait = 0;
1137 ecs->stepping_through_sigtramp = 0;
1138 ecs->sal = find_pc_line (prev_pc, 0);
1139 ecs->current_line = ecs->sal.line;
1140 ecs->current_symtab = ecs->sal.symtab;
1141 ecs->infwait_state = infwait_normal_state;
1142 ecs->waiton_ptid = pid_to_ptid (-1);
1143 ecs->wp = &(ecs->ws);
1146 /* Call this function before setting step_resume_breakpoint, as a
1147 sanity check. There should never be more than one step-resume
1148 breakpoint per thread, so we should never be setting a new
1149 step_resume_breakpoint when one is already active. */
1151 check_for_old_step_resume_breakpoint (void)
1153 if (step_resume_breakpoint)
1155 ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint");
1158 /* Return the cached copy of the last pid/waitstatus returned by
1159 target_wait()/target_wait_hook(). The data is actually cached by
1160 handle_inferior_event(), which gets called immediately after
1161 target_wait()/target_wait_hook(). */
1164 get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status)
1166 *ptidp = target_last_wait_ptid;
1167 *status = target_last_waitstatus;
1170 /* Switch thread contexts, maintaining "infrun state". */
1173 context_switch (struct execution_control_state *ecs)
1175 /* Caution: it may happen that the new thread (or the old one!)
1176 is not in the thread list. In this case we must not attempt
1177 to "switch context", or we run the risk that our context may
1178 be lost. This may happen as a result of the target module
1179 mishandling thread creation. */
1181 if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid))
1182 { /* Perform infrun state context switch: */
1183 /* Save infrun state for the old thread. */
1184 save_infrun_state (inferior_ptid, prev_pc,
1185 trap_expected, step_resume_breakpoint,
1186 through_sigtramp_breakpoint, step_range_start,
1187 step_range_end, &step_frame_id,
1188 ecs->handling_longjmp, ecs->another_trap,
1189 ecs->stepping_through_solib_after_catch,
1190 ecs->stepping_through_solib_catchpoints,
1191 ecs->stepping_through_sigtramp,
1192 ecs->current_line, ecs->current_symtab, step_sp);
1194 /* Load infrun state for the new thread. */
1195 load_infrun_state (ecs->ptid, &prev_pc,
1196 &trap_expected, &step_resume_breakpoint,
1197 &through_sigtramp_breakpoint, &step_range_start,
1198 &step_range_end, &step_frame_id,
1199 &ecs->handling_longjmp, &ecs->another_trap,
1200 &ecs->stepping_through_solib_after_catch,
1201 &ecs->stepping_through_solib_catchpoints,
1202 &ecs->stepping_through_sigtramp,
1203 &ecs->current_line, &ecs->current_symtab, &step_sp);
1205 inferior_ptid = ecs->ptid;
1208 /* Wrapper for PC_IN_SIGTRAMP that takes care of the need to find the
1211 In a classic example of "left hand VS right hand", "infrun.c" was
1212 trying to improve GDB's performance by caching the result of calls
1213 to calls to find_pc_partial_funtion, while at the same time
1214 find_pc_partial_function was also trying to ramp up performance by
1215 caching its most recent return value. The below makes the the
1216 function find_pc_partial_function solely responsibile for
1217 performance issues (the local cache that relied on a global
1218 variable - arrrggg - deleted).
1220 Using the testsuite and gcov, it was found that dropping the local
1221 "infrun.c" cache and instead relying on find_pc_partial_function
1222 increased the number of calls to 12000 (from 10000), but the number
1223 of times find_pc_partial_function's cache missed (this is what
1224 matters) was only increased by only 4 (to 3569). (A quick back of
1225 envelope caculation suggests that the extra 2000 function calls
1226 @1000 extra instructions per call make the 1 MIP VAX testsuite run
1227 take two extra seconds, oops :-)
1229 Long term, this function can be eliminated, replaced by the code:
1230 get_frame_type(current_frame()) == SIGTRAMP_FRAME (for new
1231 architectures this is very cheap). */
1234 pc_in_sigtramp (CORE_ADDR pc)
1237 find_pc_partial_function (pc, &name, NULL, NULL);
1238 return PC_IN_SIGTRAMP (pc, name);
1241 /* Handle the inferior event in the cases when we just stepped
1245 handle_step_into_function (struct execution_control_state *ecs,
1246 CORE_ADDR real_stop_pc)
1248 if ((step_over_calls == STEP_OVER_NONE)
1249 || ((step_range_end == 1)
1250 && in_prologue (prev_pc, ecs->stop_func_start)))
1252 /* I presume that step_over_calls is only 0 when we're
1253 supposed to be stepping at the assembly language level
1254 ("stepi"). Just stop. */
1255 /* Also, maybe we just did a "nexti" inside a prolog,
1256 so we thought it was a subroutine call but it was not.
1257 Stop as well. FENN */
1259 print_stop_reason (END_STEPPING_RANGE, 0);
1260 stop_stepping (ecs);
1264 if (step_over_calls == STEP_OVER_ALL || IGNORE_HELPER_CALL (stop_pc))
1266 /* We're doing a "next". */
1268 if (pc_in_sigtramp (stop_pc)
1269 && frame_id_inner (step_frame_id,
1270 frame_id_build (read_sp (), 0)))
1271 /* We stepped out of a signal handler, and into its
1272 calling trampoline. This is misdetected as a
1273 subroutine call, but stepping over the signal
1274 trampoline isn't such a bad idea. In order to do that,
1275 we have to ignore the value in step_frame_id, since
1276 that doesn't represent the frame that'll reach when we
1277 return from the signal trampoline. Otherwise we'll
1278 probably continue to the end of the program. */
1279 step_frame_id = null_frame_id;
1281 step_over_function (ecs);
1286 /* If we are in a function call trampoline (a stub between
1287 the calling routine and the real function), locate the real
1288 function. That's what tells us (a) whether we want to step
1289 into it at all, and (b) what prologue we want to run to
1290 the end of, if we do step into it. */
1291 real_stop_pc = skip_language_trampoline (stop_pc);
1292 if (real_stop_pc == 0)
1293 real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc);
1294 if (real_stop_pc != 0)
1295 ecs->stop_func_start = real_stop_pc;
1297 /* If we have line number information for the function we
1298 are thinking of stepping into, step into it.
1300 If there are several symtabs at that PC (e.g. with include
1301 files), just want to know whether *any* of them have line
1302 numbers. find_pc_line handles this. */
1304 struct symtab_and_line tmp_sal;
1306 tmp_sal = find_pc_line (ecs->stop_func_start, 0);
1307 if (tmp_sal.line != 0)
1309 step_into_function (ecs);
1314 /* If we have no line number and the step-stop-if-no-debug
1315 is set, we stop the step so that the user has a chance to
1316 switch in assembly mode. */
1317 if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug)
1320 print_stop_reason (END_STEPPING_RANGE, 0);
1321 stop_stepping (ecs);
1325 step_over_function (ecs);
1330 /* Given an execution control state that has been freshly filled in
1331 by an event from the inferior, figure out what it means and take
1332 appropriate action. */
1335 handle_inferior_event (struct execution_control_state *ecs)
1337 CORE_ADDR real_stop_pc;
1338 /* NOTE: cagney/2003-03-28: If you're looking at this code and
1339 thinking that the variable stepped_after_stopped_by_watchpoint
1340 isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT,
1341 defined in the file "config/pa/nm-hppah.h", accesses the variable
1342 indirectly. Mutter something rude about the HP merge. */
1343 int stepped_after_stopped_by_watchpoint;
1344 int sw_single_step_trap_p = 0;
1346 /* Cache the last pid/waitstatus. */
1347 target_last_wait_ptid = ecs->ptid;
1348 target_last_waitstatus = *ecs->wp;
1350 switch (ecs->infwait_state)
1352 case infwait_thread_hop_state:
1353 /* Cancel the waiton_ptid. */
1354 ecs->waiton_ptid = pid_to_ptid (-1);
1355 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1356 is serviced in this loop, below. */
1357 if (ecs->enable_hw_watchpoints_after_wait)
1359 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid));
1360 ecs->enable_hw_watchpoints_after_wait = 0;
1362 stepped_after_stopped_by_watchpoint = 0;
1365 case infwait_normal_state:
1366 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1367 is serviced in this loop, below. */
1368 if (ecs->enable_hw_watchpoints_after_wait)
1370 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid));
1371 ecs->enable_hw_watchpoints_after_wait = 0;
1373 stepped_after_stopped_by_watchpoint = 0;
1376 case infwait_nullified_state:
1377 stepped_after_stopped_by_watchpoint = 0;
1380 case infwait_nonstep_watch_state:
1381 insert_breakpoints ();
1383 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1384 handle things like signals arriving and other things happening
1385 in combination correctly? */
1386 stepped_after_stopped_by_watchpoint = 1;
1390 internal_error (__FILE__, __LINE__, "bad switch");
1392 ecs->infwait_state = infwait_normal_state;
1394 flush_cached_frames ();
1396 /* If it's a new process, add it to the thread database */
1398 ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid)
1399 && !in_thread_list (ecs->ptid));
1401 if (ecs->ws.kind != TARGET_WAITKIND_EXITED
1402 && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event)
1404 add_thread (ecs->ptid);
1406 ui_out_text (uiout, "[New ");
1407 ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid));
1408 ui_out_text (uiout, "]\n");
1411 /* NOTE: This block is ONLY meant to be invoked in case of a
1412 "thread creation event"! If it is invoked for any other
1413 sort of event (such as a new thread landing on a breakpoint),
1414 the event will be discarded, which is almost certainly
1417 To avoid this, the low-level module (eg. target_wait)
1418 should call in_thread_list and add_thread, so that the
1419 new thread is known by the time we get here. */
1421 /* We may want to consider not doing a resume here in order
1422 to give the user a chance to play with the new thread.
1423 It might be good to make that a user-settable option. */
1425 /* At this point, all threads are stopped (happens
1426 automatically in either the OS or the native code).
1427 Therefore we need to continue all threads in order to
1430 target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0);
1431 prepare_to_wait (ecs);
1436 switch (ecs->ws.kind)
1438 case TARGET_WAITKIND_LOADED:
1439 /* Ignore gracefully during startup of the inferior, as it
1440 might be the shell which has just loaded some objects,
1441 otherwise add the symbols for the newly loaded objects. */
1443 if (stop_soon == NO_STOP_QUIETLY)
1445 /* Remove breakpoints, SOLIB_ADD might adjust
1446 breakpoint addresses via breakpoint_re_set. */
1447 if (breakpoints_inserted)
1448 remove_breakpoints ();
1450 /* Check for any newly added shared libraries if we're
1451 supposed to be adding them automatically. Switch
1452 terminal for any messages produced by
1453 breakpoint_re_set. */
1454 target_terminal_ours_for_output ();
1455 /* NOTE: cagney/2003-11-25: Make certain that the target
1456 stack's section table is kept up-to-date. Architectures,
1457 (e.g., PPC64), use the section table to perform
1458 operations such as address => section name and hence
1459 require the table to contain all sections (including
1460 those found in shared libraries). */
1461 /* NOTE: cagney/2003-11-25: Pass current_target and not
1462 exec_ops to SOLIB_ADD. This is because current GDB is
1463 only tooled to propagate section_table changes out from
1464 the "current_target" (see target_resize_to_sections), and
1465 not up from the exec stratum. This, of course, isn't
1466 right. "infrun.c" should only interact with the
1467 exec/process stratum, instead relying on the target stack
1468 to propagate relevant changes (stop, section table
1469 changed, ...) up to other layers. */
1470 SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add);
1471 target_terminal_inferior ();
1473 /* Reinsert breakpoints and continue. */
1474 if (breakpoints_inserted)
1475 insert_breakpoints ();
1478 resume (0, TARGET_SIGNAL_0);
1479 prepare_to_wait (ecs);
1482 case TARGET_WAITKIND_SPURIOUS:
1483 resume (0, TARGET_SIGNAL_0);
1484 prepare_to_wait (ecs);
1487 case TARGET_WAITKIND_EXITED:
1488 target_terminal_ours (); /* Must do this before mourn anyway */
1489 print_stop_reason (EXITED, ecs->ws.value.integer);
1491 /* Record the exit code in the convenience variable $_exitcode, so
1492 that the user can inspect this again later. */
1493 set_internalvar (lookup_internalvar ("_exitcode"),
1494 value_from_longest (builtin_type_int,
1495 (LONGEST) ecs->ws.value.integer));
1496 gdb_flush (gdb_stdout);
1497 target_mourn_inferior ();
1498 singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */
1499 stop_print_frame = 0;
1500 stop_stepping (ecs);
1503 case TARGET_WAITKIND_SIGNALLED:
1504 stop_print_frame = 0;
1505 stop_signal = ecs->ws.value.sig;
1506 target_terminal_ours (); /* Must do this before mourn anyway */
1508 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1509 reach here unless the inferior is dead. However, for years
1510 target_kill() was called here, which hints that fatal signals aren't
1511 really fatal on some systems. If that's true, then some changes
1513 target_mourn_inferior ();
1515 print_stop_reason (SIGNAL_EXITED, stop_signal);
1516 singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */
1517 stop_stepping (ecs);
1520 /* The following are the only cases in which we keep going;
1521 the above cases end in a continue or goto. */
1522 case TARGET_WAITKIND_FORKED:
1523 case TARGET_WAITKIND_VFORKED:
1524 stop_signal = TARGET_SIGNAL_TRAP;
1525 pending_follow.kind = ecs->ws.kind;
1527 pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid);
1528 pending_follow.fork_event.child_pid = ecs->ws.value.related_pid;
1530 stop_pc = read_pc ();
1532 /* Assume that catchpoints are not really software breakpoints. If
1533 some future target implements them using software breakpoints then
1534 that target is responsible for fudging DECR_PC_AFTER_BREAK. Thus
1535 we pass 1 for the NOT_A_SW_BREAKPOINT argument, so that
1536 bpstat_stop_status will not decrement the PC. */
1538 stop_bpstat = bpstat_stop_status (&stop_pc, 1);
1540 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1542 /* If no catchpoint triggered for this, then keep going. */
1543 if (ecs->random_signal)
1545 stop_signal = TARGET_SIGNAL_0;
1549 goto process_event_stop_test;
1551 case TARGET_WAITKIND_EXECD:
1552 stop_signal = TARGET_SIGNAL_TRAP;
1554 /* NOTE drow/2002-12-05: This code should be pushed down into the
1555 target_wait function. Until then following vfork on HP/UX 10.20
1556 is probably broken by this. Of course, it's broken anyway. */
1557 /* Is this a target which reports multiple exec events per actual
1558 call to exec()? (HP-UX using ptrace does, for example.) If so,
1559 ignore all but the last one. Just resume the exec'r, and wait
1560 for the next exec event. */
1561 if (inferior_ignoring_leading_exec_events)
1563 inferior_ignoring_leading_exec_events--;
1564 if (pending_follow.kind == TARGET_WAITKIND_VFORKED)
1565 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event.
1567 target_resume (ecs->ptid, 0, TARGET_SIGNAL_0);
1568 prepare_to_wait (ecs);
1571 inferior_ignoring_leading_exec_events =
1572 target_reported_exec_events_per_exec_call () - 1;
1574 pending_follow.execd_pathname =
1575 savestring (ecs->ws.value.execd_pathname,
1576 strlen (ecs->ws.value.execd_pathname));
1578 /* This causes the eventpoints and symbol table to be reset. Must
1579 do this now, before trying to determine whether to stop. */
1580 follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname);
1581 xfree (pending_follow.execd_pathname);
1583 stop_pc = read_pc_pid (ecs->ptid);
1584 ecs->saved_inferior_ptid = inferior_ptid;
1585 inferior_ptid = ecs->ptid;
1587 /* Assume that catchpoints are not really software breakpoints. If
1588 some future target implements them using software breakpoints then
1589 that target is responsible for fudging DECR_PC_AFTER_BREAK. Thus
1590 we pass 1 for the NOT_A_SW_BREAKPOINT argument, so that
1591 bpstat_stop_status will not decrement the PC. */
1593 stop_bpstat = bpstat_stop_status (&stop_pc, 1);
1595 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1596 inferior_ptid = ecs->saved_inferior_ptid;
1598 /* If no catchpoint triggered for this, then keep going. */
1599 if (ecs->random_signal)
1601 stop_signal = TARGET_SIGNAL_0;
1605 goto process_event_stop_test;
1607 /* These syscall events are returned on HP-UX, as part of its
1608 implementation of page-protection-based "hardware" watchpoints.
1609 HP-UX has unfortunate interactions between page-protections and
1610 some system calls. Our solution is to disable hardware watches
1611 when a system call is entered, and reenable them when the syscall
1612 completes. The downside of this is that we may miss the precise
1613 point at which a watched piece of memory is modified. "Oh well."
1615 Note that we may have multiple threads running, which may each
1616 enter syscalls at roughly the same time. Since we don't have a
1617 good notion currently of whether a watched piece of memory is
1618 thread-private, we'd best not have any page-protections active
1619 when any thread is in a syscall. Thus, we only want to reenable
1620 hardware watches when no threads are in a syscall.
1622 Also, be careful not to try to gather much state about a thread
1623 that's in a syscall. It's frequently a losing proposition. */
1624 case TARGET_WAITKIND_SYSCALL_ENTRY:
1625 number_of_threads_in_syscalls++;
1626 if (number_of_threads_in_syscalls == 1)
1628 TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid));
1630 resume (0, TARGET_SIGNAL_0);
1631 prepare_to_wait (ecs);
1634 /* Before examining the threads further, step this thread to
1635 get it entirely out of the syscall. (We get notice of the
1636 event when the thread is just on the verge of exiting a
1637 syscall. Stepping one instruction seems to get it back
1640 Note that although the logical place to reenable h/w watches
1641 is here, we cannot. We cannot reenable them before stepping
1642 the thread (this causes the next wait on the thread to hang).
1644 Nor can we enable them after stepping until we've done a wait.
1645 Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait
1646 here, which will be serviced immediately after the target
1648 case TARGET_WAITKIND_SYSCALL_RETURN:
1649 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0);
1651 if (number_of_threads_in_syscalls > 0)
1653 number_of_threads_in_syscalls--;
1654 ecs->enable_hw_watchpoints_after_wait =
1655 (number_of_threads_in_syscalls == 0);
1657 prepare_to_wait (ecs);
1660 case TARGET_WAITKIND_STOPPED:
1661 stop_signal = ecs->ws.value.sig;
1664 /* We had an event in the inferior, but we are not interested
1665 in handling it at this level. The lower layers have already
1666 done what needs to be done, if anything.
1668 One of the possible circumstances for this is when the
1669 inferior produces output for the console. The inferior has
1670 not stopped, and we are ignoring the event. Another possible
1671 circumstance is any event which the lower level knows will be
1672 reported multiple times without an intervening resume. */
1673 case TARGET_WAITKIND_IGNORE:
1674 prepare_to_wait (ecs);
1678 /* We may want to consider not doing a resume here in order to give
1679 the user a chance to play with the new thread. It might be good
1680 to make that a user-settable option. */
1682 /* At this point, all threads are stopped (happens automatically in
1683 either the OS or the native code). Therefore we need to continue
1684 all threads in order to make progress. */
1685 if (ecs->new_thread_event)
1687 target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0);
1688 prepare_to_wait (ecs);
1692 stop_pc = read_pc_pid (ecs->ptid);
1694 /* See if a thread hit a thread-specific breakpoint that was meant for
1695 another thread. If so, then step that thread past the breakpoint,
1698 if (stop_signal == TARGET_SIGNAL_TRAP)
1700 /* Check if a regular breakpoint has been hit before checking
1701 for a potential single step breakpoint. Otherwise, GDB will
1702 not see this breakpoint hit when stepping onto breakpoints. */
1703 if (breakpoints_inserted
1704 && breakpoint_here_p (stop_pc - DECR_PC_AFTER_BREAK))
1706 ecs->random_signal = 0;
1707 if (!breakpoint_thread_match (stop_pc - DECR_PC_AFTER_BREAK,
1712 /* Saw a breakpoint, but it was hit by the wrong thread.
1714 if (DECR_PC_AFTER_BREAK)
1715 write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK, ecs->ptid);
1717 remove_status = remove_breakpoints ();
1718 /* Did we fail to remove breakpoints? If so, try
1719 to set the PC past the bp. (There's at least
1720 one situation in which we can fail to remove
1721 the bp's: On HP-UX's that use ttrace, we can't
1722 change the address space of a vforking child
1723 process until the child exits (well, okay, not
1724 then either :-) or execs. */
1725 if (remove_status != 0)
1727 /* FIXME! This is obviously non-portable! */
1728 write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK + 4, ecs->ptid);
1729 /* We need to restart all the threads now,
1730 * unles we're running in scheduler-locked mode.
1731 * Use currently_stepping to determine whether to
1734 /* FIXME MVS: is there any reason not to call resume()? */
1735 if (scheduler_mode == schedlock_on)
1736 target_resume (ecs->ptid,
1737 currently_stepping (ecs), TARGET_SIGNAL_0);
1739 target_resume (RESUME_ALL,
1740 currently_stepping (ecs), TARGET_SIGNAL_0);
1741 prepare_to_wait (ecs);
1746 breakpoints_inserted = 0;
1747 if (!ptid_equal (inferior_ptid, ecs->ptid))
1748 context_switch (ecs);
1749 ecs->waiton_ptid = ecs->ptid;
1750 ecs->wp = &(ecs->ws);
1751 ecs->another_trap = 1;
1753 ecs->infwait_state = infwait_thread_hop_state;
1755 registers_changed ();
1760 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1762 /* Readjust the stop_pc as it is off by DECR_PC_AFTER_BREAK
1763 compared to the value it would have if the system stepping
1764 capability was used. This allows the rest of the code in
1765 this function to use this address without having to worry
1766 whether software single step is in use or not. */
1767 if (DECR_PC_AFTER_BREAK)
1769 stop_pc -= DECR_PC_AFTER_BREAK;
1770 write_pc_pid (stop_pc, ecs->ptid);
1773 sw_single_step_trap_p = 1;
1774 ecs->random_signal = 0;
1778 ecs->random_signal = 1;
1780 /* See if something interesting happened to the non-current thread. If
1781 so, then switch to that thread, and eventually give control back to
1784 Note that if there's any kind of pending follow (i.e., of a fork,
1785 vfork or exec), we don't want to do this now. Rather, we'll let
1786 the next resume handle it. */
1787 if (!ptid_equal (ecs->ptid, inferior_ptid) &&
1788 (pending_follow.kind == TARGET_WAITKIND_SPURIOUS))
1792 /* If it's a random signal for a non-current thread, notify user
1793 if he's expressed an interest. */
1794 if (ecs->random_signal && signal_print[stop_signal])
1796 /* ??rehrauer: I don't understand the rationale for this code. If the
1797 inferior will stop as a result of this signal, then the act of handling
1798 the stop ought to print a message that's couches the stoppage in user
1799 terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior
1800 won't stop as a result of the signal -- i.e., if the signal is merely
1801 a side-effect of something GDB's doing "under the covers" for the
1802 user, such as stepping threads over a breakpoint they shouldn't stop
1803 for -- then the message seems to be a serious annoyance at best.
1805 For now, remove the message altogether. */
1808 target_terminal_ours_for_output ();
1809 printf_filtered ("\nProgram received signal %s, %s.\n",
1810 target_signal_to_name (stop_signal),
1811 target_signal_to_string (stop_signal));
1812 gdb_flush (gdb_stdout);
1816 /* If it's not SIGTRAP and not a signal we want to stop for, then
1817 continue the thread. */
1819 if (stop_signal != TARGET_SIGNAL_TRAP && !signal_stop[stop_signal])
1822 target_terminal_inferior ();
1824 /* Clear the signal if it should not be passed. */
1825 if (signal_program[stop_signal] == 0)
1826 stop_signal = TARGET_SIGNAL_0;
1828 target_resume (ecs->ptid, 0, stop_signal);
1829 prepare_to_wait (ecs);
1833 /* It's a SIGTRAP or a signal we're interested in. Switch threads,
1834 and fall into the rest of wait_for_inferior(). */
1836 context_switch (ecs);
1839 context_hook (pid_to_thread_id (ecs->ptid));
1841 flush_cached_frames ();
1844 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1846 /* Pull the single step breakpoints out of the target. */
1847 SOFTWARE_SINGLE_STEP (0, 0);
1848 singlestep_breakpoints_inserted_p = 0;
1851 /* If PC is pointing at a nullified instruction, then step beyond
1852 it so that the user won't be confused when GDB appears to be ready
1855 /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */
1856 if (INSTRUCTION_NULLIFIED)
1858 registers_changed ();
1859 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0);
1861 /* We may have received a signal that we want to pass to
1862 the inferior; therefore, we must not clobber the waitstatus
1865 ecs->infwait_state = infwait_nullified_state;
1866 ecs->waiton_ptid = ecs->ptid;
1867 ecs->wp = &(ecs->tmpstatus);
1868 prepare_to_wait (ecs);
1872 /* It may not be necessary to disable the watchpoint to stop over
1873 it. For example, the PA can (with some kernel cooperation)
1874 single step over a watchpoint without disabling the watchpoint. */
1875 if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1878 prepare_to_wait (ecs);
1882 /* It is far more common to need to disable a watchpoint to step
1883 the inferior over it. FIXME. What else might a debug
1884 register or page protection watchpoint scheme need here? */
1885 if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1887 /* At this point, we are stopped at an instruction which has
1888 attempted to write to a piece of memory under control of
1889 a watchpoint. The instruction hasn't actually executed
1890 yet. If we were to evaluate the watchpoint expression
1891 now, we would get the old value, and therefore no change
1892 would seem to have occurred.
1894 In order to make watchpoints work `right', we really need
1895 to complete the memory write, and then evaluate the
1896 watchpoint expression. The following code does that by
1897 removing the watchpoint (actually, all watchpoints and
1898 breakpoints), single-stepping the target, re-inserting
1899 watchpoints, and then falling through to let normal
1900 single-step processing handle proceed. Since this
1901 includes evaluating watchpoints, things will come to a
1902 stop in the correct manner. */
1904 if (DECR_PC_AFTER_BREAK)
1905 write_pc (stop_pc - DECR_PC_AFTER_BREAK);
1907 remove_breakpoints ();
1908 registers_changed ();
1909 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */
1911 ecs->waiton_ptid = ecs->ptid;
1912 ecs->wp = &(ecs->ws);
1913 ecs->infwait_state = infwait_nonstep_watch_state;
1914 prepare_to_wait (ecs);
1918 /* It may be possible to simply continue after a watchpoint. */
1919 if (HAVE_CONTINUABLE_WATCHPOINT)
1920 STOPPED_BY_WATCHPOINT (ecs->ws);
1922 ecs->stop_func_start = 0;
1923 ecs->stop_func_end = 0;
1924 ecs->stop_func_name = 0;
1925 /* Don't care about return value; stop_func_start and stop_func_name
1926 will both be 0 if it doesn't work. */
1927 find_pc_partial_function (stop_pc, &ecs->stop_func_name,
1928 &ecs->stop_func_start, &ecs->stop_func_end);
1929 ecs->stop_func_start += FUNCTION_START_OFFSET;
1930 ecs->another_trap = 0;
1931 bpstat_clear (&stop_bpstat);
1933 stop_stack_dummy = 0;
1934 stop_print_frame = 1;
1935 ecs->random_signal = 0;
1936 stopped_by_random_signal = 0;
1937 breakpoints_failed = 0;
1939 /* Look at the cause of the stop, and decide what to do.
1940 The alternatives are:
1941 1) break; to really stop and return to the debugger,
1942 2) drop through to start up again
1943 (set ecs->another_trap to 1 to single step once)
1944 3) set ecs->random_signal to 1, and the decision between 1 and 2
1945 will be made according to the signal handling tables. */
1947 /* First, distinguish signals caused by the debugger from signals
1948 that have to do with the program's own actions.
1949 Note that breakpoint insns may cause SIGTRAP or SIGILL
1950 or SIGEMT, depending on the operating system version.
1951 Here we detect when a SIGILL or SIGEMT is really a breakpoint
1952 and change it to SIGTRAP. */
1954 if (stop_signal == TARGET_SIGNAL_TRAP
1955 || (breakpoints_inserted &&
1956 (stop_signal == TARGET_SIGNAL_ILL
1957 || stop_signal == TARGET_SIGNAL_EMT))
1958 || stop_soon == STOP_QUIETLY
1959 || stop_soon == STOP_QUIETLY_NO_SIGSTOP)
1961 if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap)
1963 stop_print_frame = 0;
1964 stop_stepping (ecs);
1968 /* This is originated from start_remote(), start_inferior() and
1969 shared libraries hook functions. */
1970 if (stop_soon == STOP_QUIETLY)
1972 stop_stepping (ecs);
1976 /* This originates from attach_command(). We need to overwrite
1977 the stop_signal here, because some kernels don't ignore a
1978 SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call.
1979 See more comments in inferior.h. */
1980 if (stop_soon == STOP_QUIETLY_NO_SIGSTOP)
1982 stop_stepping (ecs);
1983 if (stop_signal == TARGET_SIGNAL_STOP)
1984 stop_signal = TARGET_SIGNAL_0;
1988 /* Don't even think about breakpoints
1989 if just proceeded over a breakpoint.
1991 However, if we are trying to proceed over a breakpoint
1992 and end up in sigtramp, then through_sigtramp_breakpoint
1993 will be set and we should check whether we've hit the
1995 if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected
1996 && through_sigtramp_breakpoint == NULL)
1997 bpstat_clear (&stop_bpstat);
2000 /* See if there is a breakpoint at the current PC. */
2002 /* The second argument of bpstat_stop_status is meant to help
2003 distinguish between a breakpoint trap and a singlestep trap.
2004 This is only important on targets where DECR_PC_AFTER_BREAK
2005 is non-zero. The prev_pc test is meant to distinguish between
2006 singlestepping a trap instruction, and singlestepping thru a
2007 jump to the instruction following a trap instruction.
2009 Therefore, pass TRUE if our reason for stopping is
2010 something other than hitting a breakpoint. We do this by
2011 checking that either: we detected earlier a software single
2012 step trap or, 1) stepping is going on and 2) we didn't hit
2013 a breakpoint in a signal handler without an intervening stop
2014 in sigtramp, which is detected by a new stack pointer value
2015 below any usual function calling stack adjustments. */
2019 sw_single_step_trap_p
2020 || (currently_stepping (ecs)
2021 && prev_pc != stop_pc - DECR_PC_AFTER_BREAK
2023 && INNER_THAN (read_sp (), (step_sp - 16)))));
2024 /* Following in case break condition called a
2026 stop_print_frame = 1;
2029 /* NOTE: cagney/2003-03-29: These two checks for a random signal
2030 at one stage in the past included checks for an inferior
2031 function call's call dummy's return breakpoint. The original
2032 comment, that went with the test, read:
2034 ``End of a stack dummy. Some systems (e.g. Sony news) give
2035 another signal besides SIGTRAP, so check here as well as
2038 If someone ever tries to get get call dummys on a
2039 non-executable stack to work (where the target would stop
2040 with something like a SIGSEG), then those tests might need to
2041 be re-instated. Given, however, that the tests were only
2042 enabled when momentary breakpoints were not being used, I
2043 suspect that it won't be the case. */
2045 if (stop_signal == TARGET_SIGNAL_TRAP)
2047 = !(bpstat_explains_signal (stop_bpstat)
2049 || (step_range_end && step_resume_breakpoint == NULL));
2052 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
2053 if (!ecs->random_signal)
2054 stop_signal = TARGET_SIGNAL_TRAP;
2058 /* When we reach this point, we've pretty much decided
2059 that the reason for stopping must've been a random
2060 (unexpected) signal. */
2063 ecs->random_signal = 1;
2065 process_event_stop_test:
2066 /* For the program's own signals, act according to
2067 the signal handling tables. */
2069 if (ecs->random_signal)
2071 /* Signal not for debugging purposes. */
2074 stopped_by_random_signal = 1;
2076 if (signal_print[stop_signal])
2079 target_terminal_ours_for_output ();
2080 print_stop_reason (SIGNAL_RECEIVED, stop_signal);
2082 if (signal_stop[stop_signal])
2084 stop_stepping (ecs);
2087 /* If not going to stop, give terminal back
2088 if we took it away. */
2090 target_terminal_inferior ();
2092 /* Clear the signal if it should not be passed. */
2093 if (signal_program[stop_signal] == 0)
2094 stop_signal = TARGET_SIGNAL_0;
2096 /* I'm not sure whether this needs to be check_sigtramp2 or
2097 whether it could/should be keep_going.
2099 This used to jump to step_over_function if we are stepping,
2102 Suppose the user does a `next' over a function call, and while
2103 that call is in progress, the inferior receives a signal for
2104 which GDB does not stop (i.e., signal_stop[SIG] is false). In
2105 that case, when we reach this point, there is already a
2106 step-resume breakpoint established, right where it should be:
2107 immediately after the function call the user is "next"-ing
2108 over. If we call step_over_function now, two bad things
2111 - we'll create a new breakpoint, at wherever the current
2112 frame's return address happens to be. That could be
2113 anywhere, depending on what function call happens to be on
2114 the top of the stack at that point. Point is, it's probably
2115 not where we need it.
2117 - the existing step-resume breakpoint (which is at the correct
2118 address) will get orphaned: step_resume_breakpoint will point
2119 to the new breakpoint, and the old step-resume breakpoint
2120 will never be cleaned up.
2122 The old behavior was meant to help HP-UX single-step out of
2123 sigtramps. It would place the new breakpoint at prev_pc, which
2124 was certainly wrong. I don't know the details there, so fixing
2125 this probably breaks that. As with anything else, it's up to
2126 the HP-UX maintainer to furnish a fix that doesn't break other
2127 platforms. --JimB, 20 May 1999 */
2128 check_sigtramp2 (ecs);
2133 /* Handle cases caused by hitting a breakpoint. */
2135 CORE_ADDR jmp_buf_pc;
2136 struct bpstat_what what;
2138 what = bpstat_what (stop_bpstat);
2140 if (what.call_dummy)
2142 stop_stack_dummy = 1;
2144 trap_expected_after_continue = 1;
2148 switch (what.main_action)
2150 case BPSTAT_WHAT_SET_LONGJMP_RESUME:
2151 /* If we hit the breakpoint at longjmp, disable it for the
2152 duration of this command. Then, install a temporary
2153 breakpoint at the target of the jmp_buf. */
2154 disable_longjmp_breakpoint ();
2155 remove_breakpoints ();
2156 breakpoints_inserted = 0;
2157 if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc))
2163 /* Need to blow away step-resume breakpoint, as it
2164 interferes with us */
2165 if (step_resume_breakpoint != NULL)
2167 delete_step_resume_breakpoint (&step_resume_breakpoint);
2169 /* Not sure whether we need to blow this away too, but probably
2170 it is like the step-resume breakpoint. */
2171 if (through_sigtramp_breakpoint != NULL)
2173 delete_breakpoint (through_sigtramp_breakpoint);
2174 through_sigtramp_breakpoint = NULL;
2178 /* FIXME - Need to implement nested temporary breakpoints */
2179 if (step_over_calls > 0)
2180 set_longjmp_resume_breakpoint (jmp_buf_pc, get_current_frame ());
2183 set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id);
2184 ecs->handling_longjmp = 1; /* FIXME */
2188 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME:
2189 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE:
2190 remove_breakpoints ();
2191 breakpoints_inserted = 0;
2193 /* FIXME - Need to implement nested temporary breakpoints */
2195 && (frame_id_inner (get_frame_id (get_current_frame ()),
2198 ecs->another_trap = 1;
2203 disable_longjmp_breakpoint ();
2204 ecs->handling_longjmp = 0; /* FIXME */
2205 if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME)
2207 /* else fallthrough */
2209 case BPSTAT_WHAT_SINGLE:
2210 if (breakpoints_inserted)
2212 remove_breakpoints ();
2214 breakpoints_inserted = 0;
2215 ecs->another_trap = 1;
2216 /* Still need to check other stuff, at least the case
2217 where we are stepping and step out of the right range. */
2220 case BPSTAT_WHAT_STOP_NOISY:
2221 stop_print_frame = 1;
2223 /* We are about to nuke the step_resume_breakpoint and
2224 through_sigtramp_breakpoint via the cleanup chain, so
2225 no need to worry about it here. */
2227 stop_stepping (ecs);
2230 case BPSTAT_WHAT_STOP_SILENT:
2231 stop_print_frame = 0;
2233 /* We are about to nuke the step_resume_breakpoint and
2234 through_sigtramp_breakpoint via the cleanup chain, so
2235 no need to worry about it here. */
2237 stop_stepping (ecs);
2240 case BPSTAT_WHAT_STEP_RESUME:
2241 /* This proably demands a more elegant solution, but, yeah
2244 This function's use of the simple variable
2245 step_resume_breakpoint doesn't seem to accomodate
2246 simultaneously active step-resume bp's, although the
2247 breakpoint list certainly can.
2249 If we reach here and step_resume_breakpoint is already
2250 NULL, then apparently we have multiple active
2251 step-resume bp's. We'll just delete the breakpoint we
2252 stopped at, and carry on.
2254 Correction: what the code currently does is delete a
2255 step-resume bp, but it makes no effort to ensure that
2256 the one deleted is the one currently stopped at. MVS */
2258 if (step_resume_breakpoint == NULL)
2260 step_resume_breakpoint =
2261 bpstat_find_step_resume_breakpoint (stop_bpstat);
2263 delete_step_resume_breakpoint (&step_resume_breakpoint);
2266 case BPSTAT_WHAT_THROUGH_SIGTRAMP:
2267 if (through_sigtramp_breakpoint)
2268 delete_breakpoint (through_sigtramp_breakpoint);
2269 through_sigtramp_breakpoint = NULL;
2271 /* If were waiting for a trap, hitting the step_resume_break
2272 doesn't count as getting it. */
2274 ecs->another_trap = 1;
2277 case BPSTAT_WHAT_CHECK_SHLIBS:
2278 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK:
2281 /* Remove breakpoints, we eventually want to step over the
2282 shlib event breakpoint, and SOLIB_ADD might adjust
2283 breakpoint addresses via breakpoint_re_set. */
2284 if (breakpoints_inserted)
2285 remove_breakpoints ();
2286 breakpoints_inserted = 0;
2288 /* Check for any newly added shared libraries if we're
2289 supposed to be adding them automatically. Switch
2290 terminal for any messages produced by
2291 breakpoint_re_set. */
2292 target_terminal_ours_for_output ();
2293 /* NOTE: cagney/2003-11-25: Make certain that the target
2294 stack's section table is kept up-to-date. Architectures,
2295 (e.g., PPC64), use the section table to perform
2296 operations such as address => section name and hence
2297 require the table to contain all sections (including
2298 those found in shared libraries). */
2299 /* NOTE: cagney/2003-11-25: Pass current_target and not
2300 exec_ops to SOLIB_ADD. This is because current GDB is
2301 only tooled to propagate section_table changes out from
2302 the "current_target" (see target_resize_to_sections), and
2303 not up from the exec stratum. This, of course, isn't
2304 right. "infrun.c" should only interact with the
2305 exec/process stratum, instead relying on the target stack
2306 to propagate relevant changes (stop, section table
2307 changed, ...) up to other layers. */
2308 SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add);
2309 target_terminal_inferior ();
2311 /* Try to reenable shared library breakpoints, additional
2312 code segments in shared libraries might be mapped in now. */
2313 re_enable_breakpoints_in_shlibs ();
2315 /* If requested, stop when the dynamic linker notifies
2316 gdb of events. This allows the user to get control
2317 and place breakpoints in initializer routines for
2318 dynamically loaded objects (among other things). */
2319 if (stop_on_solib_events)
2321 stop_stepping (ecs);
2325 /* If we stopped due to an explicit catchpoint, then the
2326 (see above) call to SOLIB_ADD pulled in any symbols
2327 from a newly-loaded library, if appropriate.
2329 We do want the inferior to stop, but not where it is
2330 now, which is in the dynamic linker callback. Rather,
2331 we would like it stop in the user's program, just after
2332 the call that caused this catchpoint to trigger. That
2333 gives the user a more useful vantage from which to
2334 examine their program's state. */
2335 else if (what.main_action ==
2336 BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK)
2338 /* ??rehrauer: If I could figure out how to get the
2339 right return PC from here, we could just set a temp
2340 breakpoint and resume. I'm not sure we can without
2341 cracking open the dld's shared libraries and sniffing
2342 their unwind tables and text/data ranges, and that's
2343 not a terribly portable notion.
2345 Until that time, we must step the inferior out of the
2346 dld callback, and also out of the dld itself (and any
2347 code or stubs in libdld.sl, such as "shl_load" and
2348 friends) until we reach non-dld code. At that point,
2349 we can stop stepping. */
2350 bpstat_get_triggered_catchpoints (stop_bpstat,
2352 stepping_through_solib_catchpoints);
2353 ecs->stepping_through_solib_after_catch = 1;
2355 /* Be sure to lift all breakpoints, so the inferior does
2356 actually step past this point... */
2357 ecs->another_trap = 1;
2362 /* We want to step over this breakpoint, then keep going. */
2363 ecs->another_trap = 1;
2370 case BPSTAT_WHAT_LAST:
2371 /* Not a real code, but listed here to shut up gcc -Wall. */
2373 case BPSTAT_WHAT_KEEP_CHECKING:
2378 /* We come here if we hit a breakpoint but should not
2379 stop for it. Possibly we also were stepping
2380 and should stop for that. So fall through and
2381 test for stepping. But, if not stepping,
2384 /* Are we stepping to get the inferior out of the dynamic
2385 linker's hook (and possibly the dld itself) after catching
2387 if (ecs->stepping_through_solib_after_catch)
2389 #if defined(SOLIB_ADD)
2390 /* Have we reached our destination? If not, keep going. */
2391 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc))
2393 ecs->another_trap = 1;
2398 /* Else, stop and report the catchpoint(s) whose triggering
2399 caused us to begin stepping. */
2400 ecs->stepping_through_solib_after_catch = 0;
2401 bpstat_clear (&stop_bpstat);
2402 stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints);
2403 bpstat_clear (&ecs->stepping_through_solib_catchpoints);
2404 stop_print_frame = 1;
2405 stop_stepping (ecs);
2409 if (step_resume_breakpoint)
2411 /* Having a step-resume breakpoint overrides anything
2412 else having to do with stepping commands until
2413 that breakpoint is reached. */
2414 /* I'm not sure whether this needs to be check_sigtramp2 or
2415 whether it could/should be keep_going. */
2416 check_sigtramp2 (ecs);
2421 if (step_range_end == 0)
2423 /* Likewise if we aren't even stepping. */
2424 /* I'm not sure whether this needs to be check_sigtramp2 or
2425 whether it could/should be keep_going. */
2426 check_sigtramp2 (ecs);
2431 /* If stepping through a line, keep going if still within it.
2433 Note that step_range_end is the address of the first instruction
2434 beyond the step range, and NOT the address of the last instruction
2436 if (stop_pc >= step_range_start && stop_pc < step_range_end)
2438 /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal.
2439 So definately need to check for sigtramp here. */
2440 check_sigtramp2 (ecs);
2445 /* We stepped out of the stepping range. */
2447 /* If we are stepping at the source level and entered the runtime
2448 loader dynamic symbol resolution code, we keep on single stepping
2449 until we exit the run time loader code and reach the callee's
2451 if (step_over_calls == STEP_OVER_UNDEBUGGABLE
2452 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc))
2454 CORE_ADDR pc_after_resolver =
2455 gdbarch_skip_solib_resolver (current_gdbarch, stop_pc);
2457 if (pc_after_resolver)
2459 /* Set up a step-resume breakpoint at the address
2460 indicated by SKIP_SOLIB_RESOLVER. */
2461 struct symtab_and_line sr_sal;
2463 sr_sal.pc = pc_after_resolver;
2465 check_for_old_step_resume_breakpoint ();
2466 step_resume_breakpoint =
2467 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2468 if (breakpoints_inserted)
2469 insert_breakpoints ();
2476 /* We can't update step_sp every time through the loop, because
2477 reading the stack pointer would slow down stepping too much.
2478 But we can update it every time we leave the step range. */
2479 ecs->update_step_sp = 1;
2481 /* Did we just take a signal? */
2482 if (pc_in_sigtramp (stop_pc)
2483 && !pc_in_sigtramp (prev_pc)
2484 && INNER_THAN (read_sp (), step_sp))
2486 /* We've just taken a signal; go until we are back to
2487 the point where we took it and one more. */
2489 /* Note: The test above succeeds not only when we stepped
2490 into a signal handler, but also when we step past the last
2491 statement of a signal handler and end up in the return stub
2492 of the signal handler trampoline. To distinguish between
2493 these two cases, check that the frame is INNER_THAN the
2494 previous one below. pai/1997-09-11 */
2498 struct frame_id current_frame = get_frame_id (get_current_frame ());
2500 if (frame_id_inner (current_frame, step_frame_id))
2502 /* We have just taken a signal; go until we are back to
2503 the point where we took it and one more. */
2505 /* This code is needed at least in the following case:
2506 The user types "next" and then a signal arrives (before
2507 the "next" is done). */
2509 /* Note that if we are stopped at a breakpoint, then we need
2510 the step_resume breakpoint to override any breakpoints at
2511 the same location, so that we will still step over the
2512 breakpoint even though the signal happened. */
2513 struct symtab_and_line sr_sal;
2516 sr_sal.symtab = NULL;
2518 sr_sal.pc = prev_pc;
2519 /* We could probably be setting the frame to
2520 step_frame_id; I don't think anyone thought to try it. */
2521 check_for_old_step_resume_breakpoint ();
2522 step_resume_breakpoint =
2523 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2524 if (breakpoints_inserted)
2525 insert_breakpoints ();
2529 /* We just stepped out of a signal handler and into
2530 its calling trampoline.
2532 Normally, we'd call step_over_function from
2533 here, but for some reason GDB can't unwind the
2534 stack correctly to find the real PC for the point
2535 user code where the signal trampoline will return
2536 -- FRAME_SAVED_PC fails, at least on HP-UX 10.20.
2537 But signal trampolines are pretty small stubs of
2538 code, anyway, so it's OK instead to just
2539 single-step out. Note: assuming such trampolines
2540 don't exhibit recursion on any platform... */
2541 find_pc_partial_function (stop_pc, &ecs->stop_func_name,
2542 &ecs->stop_func_start,
2543 &ecs->stop_func_end);
2544 /* Readjust stepping range */
2545 step_range_start = ecs->stop_func_start;
2546 step_range_end = ecs->stop_func_end;
2547 ecs->stepping_through_sigtramp = 1;
2552 /* If this is stepi or nexti, make sure that the stepping range
2553 gets us past that instruction. */
2554 if (step_range_end == 1)
2555 /* FIXME: Does this run afoul of the code below which, if
2556 we step into the middle of a line, resets the stepping
2558 step_range_end = (step_range_start = prev_pc) + 1;
2560 ecs->remove_breakpoints_on_following_step = 1;
2565 if (((stop_pc == ecs->stop_func_start /* Quick test */
2566 || in_prologue (stop_pc, ecs->stop_func_start))
2567 && !IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name))
2568 || IN_SOLIB_CALL_TRAMPOLINE (stop_pc, ecs->stop_func_name)
2569 || ecs->stop_func_name == 0)
2571 /* It's a subroutine call. */
2572 handle_step_into_function (ecs, real_stop_pc);
2576 /* We've wandered out of the step range. */
2578 ecs->sal = find_pc_line (stop_pc, 0);
2580 if (step_range_end == 1)
2582 /* It is stepi or nexti. We always want to stop stepping after
2585 print_stop_reason (END_STEPPING_RANGE, 0);
2586 stop_stepping (ecs);
2590 /* If we're in the return path from a shared library trampoline,
2591 we want to proceed through the trampoline when stepping. */
2592 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name))
2594 /* Determine where this trampoline returns. */
2595 real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc);
2597 /* Only proceed through if we know where it's going. */
2600 /* And put the step-breakpoint there and go until there. */
2601 struct symtab_and_line sr_sal;
2603 init_sal (&sr_sal); /* initialize to zeroes */
2604 sr_sal.pc = real_stop_pc;
2605 sr_sal.section = find_pc_overlay (sr_sal.pc);
2606 /* Do not specify what the fp should be when we stop
2607 since on some machines the prologue
2608 is where the new fp value is established. */
2609 check_for_old_step_resume_breakpoint ();
2610 step_resume_breakpoint =
2611 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2612 if (breakpoints_inserted)
2613 insert_breakpoints ();
2615 /* Restart without fiddling with the step ranges or
2622 if (ecs->sal.line == 0)
2624 /* We have no line number information. That means to stop
2625 stepping (does this always happen right after one instruction,
2626 when we do "s" in a function with no line numbers,
2627 or can this happen as a result of a return or longjmp?). */
2629 print_stop_reason (END_STEPPING_RANGE, 0);
2630 stop_stepping (ecs);
2634 if ((stop_pc == ecs->sal.pc)
2635 && (ecs->current_line != ecs->sal.line
2636 || ecs->current_symtab != ecs->sal.symtab))
2638 /* We are at the start of a different line. So stop. Note that
2639 we don't stop if we step into the middle of a different line.
2640 That is said to make things like for (;;) statements work
2643 print_stop_reason (END_STEPPING_RANGE, 0);
2644 stop_stepping (ecs);
2648 /* We aren't done stepping.
2650 Optimize by setting the stepping range to the line.
2651 (We might not be in the original line, but if we entered a
2652 new line in mid-statement, we continue stepping. This makes
2653 things like for(;;) statements work better.) */
2655 if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end)
2657 /* If this is the last line of the function, don't keep stepping
2658 (it would probably step us out of the function).
2659 This is particularly necessary for a one-line function,
2660 in which after skipping the prologue we better stop even though
2661 we will be in mid-line. */
2663 print_stop_reason (END_STEPPING_RANGE, 0);
2664 stop_stepping (ecs);
2667 step_range_start = ecs->sal.pc;
2668 step_range_end = ecs->sal.end;
2669 step_frame_id = get_frame_id (get_current_frame ());
2670 ecs->current_line = ecs->sal.line;
2671 ecs->current_symtab = ecs->sal.symtab;
2673 /* In the case where we just stepped out of a function into the
2674 middle of a line of the caller, continue stepping, but
2675 step_frame_id must be modified to current frame */
2677 /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too
2678 generous. It will trigger on things like a step into a frameless
2679 stackless leaf function. I think the logic should instead look
2680 at the unwound frame ID has that should give a more robust
2681 indication of what happened. */
2682 if (step-ID == current-ID)
2683 still stepping in same function;
2684 else if (step-ID == unwind (current-ID))
2685 stepped into a function;
2687 stepped out of a function;
2688 /* Of course this assumes that the frame ID unwind code is robust
2689 and we're willing to introduce frame unwind logic into this
2690 function. Fortunately, those days are nearly upon us. */
2693 struct frame_id current_frame = get_frame_id (get_current_frame ());
2694 if (!(frame_id_inner (current_frame, step_frame_id)))
2695 step_frame_id = current_frame;
2701 /* Are we in the middle of stepping? */
2704 currently_stepping (struct execution_control_state *ecs)
2706 return ((through_sigtramp_breakpoint == NULL
2707 && !ecs->handling_longjmp
2708 && ((step_range_end && step_resume_breakpoint == NULL)
2710 || ecs->stepping_through_solib_after_catch
2711 || bpstat_should_step ());
2715 check_sigtramp2 (struct execution_control_state *ecs)
2718 && pc_in_sigtramp (stop_pc)
2719 && !pc_in_sigtramp (prev_pc)
2720 && INNER_THAN (read_sp (), step_sp))
2722 /* What has happened here is that we have just stepped the
2723 inferior with a signal (because it is a signal which
2724 shouldn't make us stop), thus stepping into sigtramp.
2726 So we need to set a step_resume_break_address breakpoint and
2727 continue until we hit it, and then step. FIXME: This should
2728 be more enduring than a step_resume breakpoint; we should
2729 know that we will later need to keep going rather than
2730 re-hitting the breakpoint here (see the testsuite,
2731 gdb.base/signals.exp where it says "exceedingly difficult"). */
2733 struct symtab_and_line sr_sal;
2735 init_sal (&sr_sal); /* initialize to zeroes */
2736 sr_sal.pc = prev_pc;
2737 sr_sal.section = find_pc_overlay (sr_sal.pc);
2738 /* We perhaps could set the frame if we kept track of what the
2739 frame corresponding to prev_pc was. But we don't, so don't. */
2740 through_sigtramp_breakpoint =
2741 set_momentary_breakpoint (sr_sal, null_frame_id, bp_through_sigtramp);
2742 if (breakpoints_inserted)
2743 insert_breakpoints ();
2745 ecs->remove_breakpoints_on_following_step = 1;
2746 ecs->another_trap = 1;
2750 /* Subroutine call with source code we should not step over. Do step
2751 to the first line of code in it. */
2754 step_into_function (struct execution_control_state *ecs)
2757 struct symtab_and_line sr_sal;
2759 s = find_pc_symtab (stop_pc);
2760 if (s && s->language != language_asm)
2761 ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start);
2763 ecs->sal = find_pc_line (ecs->stop_func_start, 0);
2764 /* Use the step_resume_break to step until the end of the prologue,
2765 even if that involves jumps (as it seems to on the vax under
2767 /* If the prologue ends in the middle of a source line, continue to
2768 the end of that source line (if it is still within the function).
2769 Otherwise, just go to end of prologue. */
2771 && ecs->sal.pc != ecs->stop_func_start
2772 && ecs->sal.end < ecs->stop_func_end)
2773 ecs->stop_func_start = ecs->sal.end;
2775 if (ecs->stop_func_start == stop_pc)
2777 /* We are already there: stop now. */
2779 print_stop_reason (END_STEPPING_RANGE, 0);
2780 stop_stepping (ecs);
2785 /* Put the step-breakpoint there and go until there. */
2786 init_sal (&sr_sal); /* initialize to zeroes */
2787 sr_sal.pc = ecs->stop_func_start;
2788 sr_sal.section = find_pc_overlay (ecs->stop_func_start);
2789 /* Do not specify what the fp should be when we stop since on
2790 some machines the prologue is where the new fp value is
2792 check_for_old_step_resume_breakpoint ();
2793 step_resume_breakpoint =
2794 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2795 if (breakpoints_inserted)
2796 insert_breakpoints ();
2798 /* And make sure stepping stops right away then. */
2799 step_range_end = step_range_start;
2804 /* We've just entered a callee, and we wish to resume until it returns
2805 to the caller. Setting a step_resume breakpoint on the return
2806 address will catch a return from the callee.
2808 However, if the callee is recursing, we want to be careful not to
2809 catch returns of those recursive calls, but only of THIS instance
2812 To do this, we set the step_resume bp's frame to our current
2813 caller's frame (step_frame_id, which is set by the "next" or
2814 "until" command, before execution begins). */
2817 step_over_function (struct execution_control_state *ecs)
2819 struct symtab_and_line sr_sal;
2821 init_sal (&sr_sal); /* initialize to zeros */
2823 /* NOTE: cagney/2003-04-06:
2825 At this point the equality get_frame_pc() == get_frame_func()
2826 should hold. This may make it possible for this code to tell the
2827 frame where it's function is, instead of the reverse. This would
2828 avoid the need to search for the frame's function, which can get
2829 very messy when there is no debug info available (look at the
2830 heuristic find pc start code found in targets like the MIPS). */
2832 /* NOTE: cagney/2003-04-06:
2834 The intent of DEPRECATED_SAVED_PC_AFTER_CALL was to:
2836 - provide a very light weight equivalent to frame_unwind_pc()
2837 (nee FRAME_SAVED_PC) that avoids the prologue analyzer
2839 - avoid handling the case where the PC hasn't been saved in the
2842 Unfortunately, not five lines further down, is a call to
2843 get_frame_id() and that is guarenteed to trigger the prologue
2846 The `correct fix' is for the prologe analyzer to handle the case
2847 where the prologue is incomplete (PC in prologue) and,
2848 consequently, the return pc has not yet been saved. It should be
2849 noted that the prologue analyzer needs to handle this case
2850 anyway: frameless leaf functions that don't save the return PC;
2851 single stepping through a prologue.
2853 The d10v handles all this by bailing out of the prologue analsis
2854 when it reaches the current instruction. */
2856 if (DEPRECATED_SAVED_PC_AFTER_CALL_P ())
2857 sr_sal.pc = ADDR_BITS_REMOVE (DEPRECATED_SAVED_PC_AFTER_CALL (get_current_frame ()));
2859 sr_sal.pc = ADDR_BITS_REMOVE (frame_pc_unwind (get_current_frame ()));
2860 sr_sal.section = find_pc_overlay (sr_sal.pc);
2862 check_for_old_step_resume_breakpoint ();
2863 step_resume_breakpoint =
2864 set_momentary_breakpoint (sr_sal, get_frame_id (get_current_frame ()),
2867 if (frame_id_p (step_frame_id)
2868 && !IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal.pc))
2869 step_resume_breakpoint->frame_id = step_frame_id;
2871 if (breakpoints_inserted)
2872 insert_breakpoints ();
2876 stop_stepping (struct execution_control_state *ecs)
2878 /* Let callers know we don't want to wait for the inferior anymore. */
2879 ecs->wait_some_more = 0;
2882 /* This function handles various cases where we need to continue
2883 waiting for the inferior. */
2884 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2887 keep_going (struct execution_control_state *ecs)
2889 /* Save the pc before execution, to compare with pc after stop. */
2890 prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */
2892 if (ecs->update_step_sp)
2893 step_sp = read_sp ();
2894 ecs->update_step_sp = 0;
2896 /* If we did not do break;, it means we should keep running the
2897 inferior and not return to debugger. */
2899 if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP)
2901 /* We took a signal (which we are supposed to pass through to
2902 the inferior, else we'd have done a break above) and we
2903 haven't yet gotten our trap. Simply continue. */
2904 resume (currently_stepping (ecs), stop_signal);
2908 /* Either the trap was not expected, but we are continuing
2909 anyway (the user asked that this signal be passed to the
2912 The signal was SIGTRAP, e.g. it was our signal, but we
2913 decided we should resume from it.
2915 We're going to run this baby now!
2917 Insert breakpoints now, unless we are trying to one-proceed
2918 past a breakpoint. */
2919 /* If we've just finished a special step resume and we don't
2920 want to hit a breakpoint, pull em out. */
2921 if (step_resume_breakpoint == NULL
2922 && through_sigtramp_breakpoint == NULL
2923 && ecs->remove_breakpoints_on_following_step)
2925 ecs->remove_breakpoints_on_following_step = 0;
2926 remove_breakpoints ();
2927 breakpoints_inserted = 0;
2929 else if (!breakpoints_inserted &&
2930 (through_sigtramp_breakpoint != NULL || !ecs->another_trap))
2932 breakpoints_failed = insert_breakpoints ();
2933 if (breakpoints_failed)
2935 stop_stepping (ecs);
2938 breakpoints_inserted = 1;
2941 trap_expected = ecs->another_trap;
2943 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
2944 specifies that such a signal should be delivered to the
2947 Typically, this would occure when a user is debugging a
2948 target monitor on a simulator: the target monitor sets a
2949 breakpoint; the simulator encounters this break-point and
2950 halts the simulation handing control to GDB; GDB, noteing
2951 that the break-point isn't valid, returns control back to the
2952 simulator; the simulator then delivers the hardware
2953 equivalent of a SIGNAL_TRAP to the program being debugged. */
2955 if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal])
2956 stop_signal = TARGET_SIGNAL_0;
2958 #ifdef SHIFT_INST_REGS
2959 /* I'm not sure when this following segment applies. I do know,
2960 now, that we shouldn't rewrite the regs when we were stopped
2961 by a random signal from the inferior process. */
2962 /* FIXME: Shouldn't this be based on the valid bit of the SXIP?
2963 (this is only used on the 88k). */
2965 if (!bpstat_explains_signal (stop_bpstat)
2966 && (stop_signal != TARGET_SIGNAL_CHLD) && !stopped_by_random_signal)
2968 #endif /* SHIFT_INST_REGS */
2970 resume (currently_stepping (ecs), stop_signal);
2973 prepare_to_wait (ecs);
2976 /* This function normally comes after a resume, before
2977 handle_inferior_event exits. It takes care of any last bits of
2978 housekeeping, and sets the all-important wait_some_more flag. */
2981 prepare_to_wait (struct execution_control_state *ecs)
2983 if (ecs->infwait_state == infwait_normal_state)
2985 overlay_cache_invalid = 1;
2987 /* We have to invalidate the registers BEFORE calling
2988 target_wait because they can be loaded from the target while
2989 in target_wait. This makes remote debugging a bit more
2990 efficient for those targets that provide critical registers
2991 as part of their normal status mechanism. */
2993 registers_changed ();
2994 ecs->waiton_ptid = pid_to_ptid (-1);
2995 ecs->wp = &(ecs->ws);
2997 /* This is the old end of the while loop. Let everybody know we
2998 want to wait for the inferior some more and get called again
3000 ecs->wait_some_more = 1;
3003 /* Print why the inferior has stopped. We always print something when
3004 the inferior exits, or receives a signal. The rest of the cases are
3005 dealt with later on in normal_stop() and print_it_typical(). Ideally
3006 there should be a call to this function from handle_inferior_event()
3007 each time stop_stepping() is called.*/
3009 print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info)
3011 switch (stop_reason)
3014 /* We don't deal with these cases from handle_inferior_event()
3017 case END_STEPPING_RANGE:
3018 /* We are done with a step/next/si/ni command. */
3019 /* For now print nothing. */
3020 /* Print a message only if not in the middle of doing a "step n"
3021 operation for n > 1 */
3022 if (!step_multi || !stop_step)
3023 if (ui_out_is_mi_like_p (uiout))
3024 ui_out_field_string (uiout, "reason", "end-stepping-range");
3026 case BREAKPOINT_HIT:
3027 /* We found a breakpoint. */
3028 /* For now print nothing. */
3031 /* The inferior was terminated by a signal. */
3032 annotate_signalled ();
3033 if (ui_out_is_mi_like_p (uiout))
3034 ui_out_field_string (uiout, "reason", "exited-signalled");
3035 ui_out_text (uiout, "\nProgram terminated with signal ");
3036 annotate_signal_name ();
3037 ui_out_field_string (uiout, "signal-name",
3038 target_signal_to_name (stop_info));
3039 annotate_signal_name_end ();
3040 ui_out_text (uiout, ", ");
3041 annotate_signal_string ();
3042 ui_out_field_string (uiout, "signal-meaning",
3043 target_signal_to_string (stop_info));
3044 annotate_signal_string_end ();
3045 ui_out_text (uiout, ".\n");
3046 ui_out_text (uiout, "The program no longer exists.\n");
3049 /* The inferior program is finished. */
3050 annotate_exited (stop_info);
3053 if (ui_out_is_mi_like_p (uiout))
3054 ui_out_field_string (uiout, "reason", "exited");
3055 ui_out_text (uiout, "\nProgram exited with code ");
3056 ui_out_field_fmt (uiout, "exit-code", "0%o",
3057 (unsigned int) stop_info);
3058 ui_out_text (uiout, ".\n");
3062 if (ui_out_is_mi_like_p (uiout))
3063 ui_out_field_string (uiout, "reason", "exited-normally");
3064 ui_out_text (uiout, "\nProgram exited normally.\n");
3067 case SIGNAL_RECEIVED:
3068 /* Signal received. The signal table tells us to print about
3071 ui_out_text (uiout, "\nProgram received signal ");
3072 annotate_signal_name ();
3073 if (ui_out_is_mi_like_p (uiout))
3074 ui_out_field_string (uiout, "reason", "signal-received");
3075 ui_out_field_string (uiout, "signal-name",
3076 target_signal_to_name (stop_info));
3077 annotate_signal_name_end ();
3078 ui_out_text (uiout, ", ");
3079 annotate_signal_string ();
3080 ui_out_field_string (uiout, "signal-meaning",
3081 target_signal_to_string (stop_info));
3082 annotate_signal_string_end ();
3083 ui_out_text (uiout, ".\n");
3086 internal_error (__FILE__, __LINE__,
3087 "print_stop_reason: unrecognized enum value");
3093 /* Here to return control to GDB when the inferior stops for real.
3094 Print appropriate messages, remove breakpoints, give terminal our modes.
3096 STOP_PRINT_FRAME nonzero means print the executing frame
3097 (pc, function, args, file, line number and line text).
3098 BREAKPOINTS_FAILED nonzero means stop was due to error
3099 attempting to insert breakpoints. */
3104 struct target_waitstatus last;
3107 get_last_target_status (&last_ptid, &last);
3109 /* As with the notification of thread events, we want to delay
3110 notifying the user that we've switched thread context until
3111 the inferior actually stops.
3113 There's no point in saying anything if the inferior has exited.
3114 Note that SIGNALLED here means "exited with a signal", not
3115 "received a signal". */
3116 if (!ptid_equal (previous_inferior_ptid, inferior_ptid)
3117 && target_has_execution
3118 && last.kind != TARGET_WAITKIND_SIGNALLED
3119 && last.kind != TARGET_WAITKIND_EXITED)
3121 target_terminal_ours_for_output ();
3122 printf_filtered ("[Switching to %s]\n",
3123 target_pid_or_tid_to_str (inferior_ptid));
3124 previous_inferior_ptid = inferior_ptid;
3127 /* Make sure that the current_frame's pc is correct. This
3128 is a correction for setting up the frame info before doing
3129 DECR_PC_AFTER_BREAK */
3130 if (target_has_execution)
3131 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
3132 DECR_PC_AFTER_BREAK, the program counter can change. Ask the
3133 frame code to check for this and sort out any resultant mess.
3134 DECR_PC_AFTER_BREAK needs to just go away. */
3135 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
3137 if (target_has_execution && breakpoints_inserted)
3139 if (remove_breakpoints ())
3141 target_terminal_ours_for_output ();
3142 printf_filtered ("Cannot remove breakpoints because ");
3143 printf_filtered ("program is no longer writable.\n");
3144 printf_filtered ("It might be running in another process.\n");
3145 printf_filtered ("Further execution is probably impossible.\n");
3148 breakpoints_inserted = 0;
3150 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3151 Delete any breakpoint that is to be deleted at the next stop. */
3153 breakpoint_auto_delete (stop_bpstat);
3155 /* If an auto-display called a function and that got a signal,
3156 delete that auto-display to avoid an infinite recursion. */
3158 if (stopped_by_random_signal)
3159 disable_current_display ();
3161 /* Don't print a message if in the middle of doing a "step n"
3162 operation for n > 1 */
3163 if (step_multi && stop_step)
3166 target_terminal_ours ();
3168 /* Look up the hook_stop and run it (CLI internally handles problem
3169 of stop_command's pre-hook not existing). */
3171 catch_errors (hook_stop_stub, stop_command,
3172 "Error while running hook_stop:\n", RETURN_MASK_ALL);
3174 if (!target_has_stack)
3180 /* Select innermost stack frame - i.e., current frame is frame 0,
3181 and current location is based on that.
3182 Don't do this on return from a stack dummy routine,
3183 or if the program has exited. */
3185 if (!stop_stack_dummy)
3187 select_frame (get_current_frame ());
3189 /* Print current location without a level number, if
3190 we have changed functions or hit a breakpoint.
3191 Print source line if we have one.
3192 bpstat_print() contains the logic deciding in detail
3193 what to print, based on the event(s) that just occurred. */
3195 if (stop_print_frame && deprecated_selected_frame)
3199 int do_frame_printing = 1;
3201 bpstat_ret = bpstat_print (stop_bpstat);
3205 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3206 (or should) carry around the function and does (or
3207 should) use that when doing a frame comparison. */
3209 && frame_id_eq (step_frame_id,
3210 get_frame_id (get_current_frame ()))
3211 && step_start_function == find_pc_function (stop_pc))
3212 source_flag = SRC_LINE; /* finished step, just print source line */
3214 source_flag = SRC_AND_LOC; /* print location and source line */
3216 case PRINT_SRC_AND_LOC:
3217 source_flag = SRC_AND_LOC; /* print location and source line */
3219 case PRINT_SRC_ONLY:
3220 source_flag = SRC_LINE;
3223 source_flag = SRC_LINE; /* something bogus */
3224 do_frame_printing = 0;
3227 internal_error (__FILE__, __LINE__, "Unknown value.");
3229 /* For mi, have the same behavior every time we stop:
3230 print everything but the source line. */
3231 if (ui_out_is_mi_like_p (uiout))
3232 source_flag = LOC_AND_ADDRESS;
3234 if (ui_out_is_mi_like_p (uiout))
3235 ui_out_field_int (uiout, "thread-id",
3236 pid_to_thread_id (inferior_ptid));
3237 /* The behavior of this routine with respect to the source
3239 SRC_LINE: Print only source line
3240 LOCATION: Print only location
3241 SRC_AND_LOC: Print location and source line */
3242 if (do_frame_printing)
3243 print_stack_frame (deprecated_selected_frame, -1, source_flag);
3245 /* Display the auto-display expressions. */
3250 /* Save the function value return registers, if we care.
3251 We might be about to restore their previous contents. */
3252 if (proceed_to_finish)
3253 /* NB: The copy goes through to the target picking up the value of
3254 all the registers. */
3255 regcache_cpy (stop_registers, current_regcache);
3257 if (stop_stack_dummy)
3259 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3260 ends with a setting of the current frame, so we can use that
3262 frame_pop (get_current_frame ());
3263 /* Set stop_pc to what it was before we called the function.
3264 Can't rely on restore_inferior_status because that only gets
3265 called if we don't stop in the called function. */
3266 stop_pc = read_pc ();
3267 select_frame (get_current_frame ());
3271 annotate_stopped ();
3272 observer_notify_normal_stop ();
3276 hook_stop_stub (void *cmd)
3278 execute_cmd_pre_hook ((struct cmd_list_element *) cmd);
3283 signal_stop_state (int signo)
3285 return signal_stop[signo];
3289 signal_print_state (int signo)
3291 return signal_print[signo];
3295 signal_pass_state (int signo)
3297 return signal_program[signo];
3301 signal_stop_update (int signo, int state)
3303 int ret = signal_stop[signo];
3304 signal_stop[signo] = state;
3309 signal_print_update (int signo, int state)
3311 int ret = signal_print[signo];
3312 signal_print[signo] = state;
3317 signal_pass_update (int signo, int state)
3319 int ret = signal_program[signo];
3320 signal_program[signo] = state;
3325 sig_print_header (void)
3328 Signal Stop\tPrint\tPass to program\tDescription\n");
3332 sig_print_info (enum target_signal oursig)
3334 char *name = target_signal_to_name (oursig);
3335 int name_padding = 13 - strlen (name);
3337 if (name_padding <= 0)
3340 printf_filtered ("%s", name);
3341 printf_filtered ("%*.*s ", name_padding, name_padding, " ");
3342 printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No");
3343 printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No");
3344 printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No");
3345 printf_filtered ("%s\n", target_signal_to_string (oursig));
3348 /* Specify how various signals in the inferior should be handled. */
3351 handle_command (char *args, int from_tty)
3354 int digits, wordlen;
3355 int sigfirst, signum, siglast;
3356 enum target_signal oursig;
3359 unsigned char *sigs;
3360 struct cleanup *old_chain;
3364 error_no_arg ("signal to handle");
3367 /* Allocate and zero an array of flags for which signals to handle. */
3369 nsigs = (int) TARGET_SIGNAL_LAST;
3370 sigs = (unsigned char *) alloca (nsigs);
3371 memset (sigs, 0, nsigs);
3373 /* Break the command line up into args. */
3375 argv = buildargv (args);
3380 old_chain = make_cleanup_freeargv (argv);
3382 /* Walk through the args, looking for signal oursigs, signal names, and
3383 actions. Signal numbers and signal names may be interspersed with
3384 actions, with the actions being performed for all signals cumulatively
3385 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3387 while (*argv != NULL)
3389 wordlen = strlen (*argv);
3390 for (digits = 0; isdigit ((*argv)[digits]); digits++)
3394 sigfirst = siglast = -1;
3396 if (wordlen >= 1 && !strncmp (*argv, "all", wordlen))
3398 /* Apply action to all signals except those used by the
3399 debugger. Silently skip those. */
3402 siglast = nsigs - 1;
3404 else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen))
3406 SET_SIGS (nsigs, sigs, signal_stop);
3407 SET_SIGS (nsigs, sigs, signal_print);
3409 else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen))
3411 UNSET_SIGS (nsigs, sigs, signal_program);
3413 else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen))
3415 SET_SIGS (nsigs, sigs, signal_print);
3417 else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen))
3419 SET_SIGS (nsigs, sigs, signal_program);
3421 else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen))
3423 UNSET_SIGS (nsigs, sigs, signal_stop);
3425 else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen))
3427 SET_SIGS (nsigs, sigs, signal_program);
3429 else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen))
3431 UNSET_SIGS (nsigs, sigs, signal_print);
3432 UNSET_SIGS (nsigs, sigs, signal_stop);
3434 else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen))
3436 UNSET_SIGS (nsigs, sigs, signal_program);
3438 else if (digits > 0)
3440 /* It is numeric. The numeric signal refers to our own
3441 internal signal numbering from target.h, not to host/target
3442 signal number. This is a feature; users really should be
3443 using symbolic names anyway, and the common ones like
3444 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3446 sigfirst = siglast = (int)
3447 target_signal_from_command (atoi (*argv));
3448 if ((*argv)[digits] == '-')
3451 target_signal_from_command (atoi ((*argv) + digits + 1));
3453 if (sigfirst > siglast)
3455 /* Bet he didn't figure we'd think of this case... */
3463 oursig = target_signal_from_name (*argv);
3464 if (oursig != TARGET_SIGNAL_UNKNOWN)
3466 sigfirst = siglast = (int) oursig;
3470 /* Not a number and not a recognized flag word => complain. */
3471 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv);
3475 /* If any signal numbers or symbol names were found, set flags for
3476 which signals to apply actions to. */
3478 for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++)
3480 switch ((enum target_signal) signum)
3482 case TARGET_SIGNAL_TRAP:
3483 case TARGET_SIGNAL_INT:
3484 if (!allsigs && !sigs[signum])
3486 if (query ("%s is used by the debugger.\n\
3487 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum)))
3493 printf_unfiltered ("Not confirmed, unchanged.\n");
3494 gdb_flush (gdb_stdout);
3498 case TARGET_SIGNAL_0:
3499 case TARGET_SIGNAL_DEFAULT:
3500 case TARGET_SIGNAL_UNKNOWN:
3501 /* Make sure that "all" doesn't print these. */
3512 target_notice_signals (inferior_ptid);
3516 /* Show the results. */
3517 sig_print_header ();
3518 for (signum = 0; signum < nsigs; signum++)
3522 sig_print_info (signum);
3527 do_cleanups (old_chain);
3531 xdb_handle_command (char *args, int from_tty)
3534 struct cleanup *old_chain;
3536 /* Break the command line up into args. */
3538 argv = buildargv (args);
3543 old_chain = make_cleanup_freeargv (argv);
3544 if (argv[1] != (char *) NULL)
3549 bufLen = strlen (argv[0]) + 20;
3550 argBuf = (char *) xmalloc (bufLen);
3554 enum target_signal oursig;
3556 oursig = target_signal_from_name (argv[0]);
3557 memset (argBuf, 0, bufLen);
3558 if (strcmp (argv[1], "Q") == 0)
3559 sprintf (argBuf, "%s %s", argv[0], "noprint");
3562 if (strcmp (argv[1], "s") == 0)
3564 if (!signal_stop[oursig])
3565 sprintf (argBuf, "%s %s", argv[0], "stop");
3567 sprintf (argBuf, "%s %s", argv[0], "nostop");
3569 else if (strcmp (argv[1], "i") == 0)
3571 if (!signal_program[oursig])
3572 sprintf (argBuf, "%s %s", argv[0], "pass");
3574 sprintf (argBuf, "%s %s", argv[0], "nopass");
3576 else if (strcmp (argv[1], "r") == 0)
3578 if (!signal_print[oursig])
3579 sprintf (argBuf, "%s %s", argv[0], "print");
3581 sprintf (argBuf, "%s %s", argv[0], "noprint");
3587 handle_command (argBuf, from_tty);
3589 printf_filtered ("Invalid signal handling flag.\n");
3594 do_cleanups (old_chain);
3597 /* Print current contents of the tables set by the handle command.
3598 It is possible we should just be printing signals actually used
3599 by the current target (but for things to work right when switching
3600 targets, all signals should be in the signal tables). */
3603 signals_info (char *signum_exp, int from_tty)
3605 enum target_signal oursig;
3606 sig_print_header ();
3610 /* First see if this is a symbol name. */
3611 oursig = target_signal_from_name (signum_exp);
3612 if (oursig == TARGET_SIGNAL_UNKNOWN)
3614 /* No, try numeric. */
3616 target_signal_from_command (parse_and_eval_long (signum_exp));
3618 sig_print_info (oursig);
3622 printf_filtered ("\n");
3623 /* These ugly casts brought to you by the native VAX compiler. */
3624 for (oursig = TARGET_SIGNAL_FIRST;
3625 (int) oursig < (int) TARGET_SIGNAL_LAST;
3626 oursig = (enum target_signal) ((int) oursig + 1))
3630 if (oursig != TARGET_SIGNAL_UNKNOWN
3631 && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0)
3632 sig_print_info (oursig);
3635 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
3638 struct inferior_status
3640 enum target_signal stop_signal;
3644 int stop_stack_dummy;
3645 int stopped_by_random_signal;
3647 CORE_ADDR step_range_start;
3648 CORE_ADDR step_range_end;
3649 struct frame_id step_frame_id;
3650 enum step_over_calls_kind step_over_calls;
3651 CORE_ADDR step_resume_break_address;
3652 int stop_after_trap;
3654 struct regcache *stop_registers;
3656 /* These are here because if call_function_by_hand has written some
3657 registers and then decides to call error(), we better not have changed
3659 struct regcache *registers;
3661 /* A frame unique identifier. */
3662 struct frame_id selected_frame_id;
3664 int breakpoint_proceeded;
3665 int restore_stack_info;
3666 int proceed_to_finish;
3670 write_inferior_status_register (struct inferior_status *inf_status, int regno,
3673 int size = DEPRECATED_REGISTER_RAW_SIZE (regno);
3674 void *buf = alloca (size);
3675 store_signed_integer (buf, size, val);
3676 regcache_raw_write (inf_status->registers, regno, buf);
3679 /* Save all of the information associated with the inferior<==>gdb
3680 connection. INF_STATUS is a pointer to a "struct inferior_status"
3681 (defined in inferior.h). */
3683 struct inferior_status *
3684 save_inferior_status (int restore_stack_info)
3686 struct inferior_status *inf_status = XMALLOC (struct inferior_status);
3688 inf_status->stop_signal = stop_signal;
3689 inf_status->stop_pc = stop_pc;
3690 inf_status->stop_step = stop_step;
3691 inf_status->stop_stack_dummy = stop_stack_dummy;
3692 inf_status->stopped_by_random_signal = stopped_by_random_signal;
3693 inf_status->trap_expected = trap_expected;
3694 inf_status->step_range_start = step_range_start;
3695 inf_status->step_range_end = step_range_end;
3696 inf_status->step_frame_id = step_frame_id;
3697 inf_status->step_over_calls = step_over_calls;
3698 inf_status->stop_after_trap = stop_after_trap;
3699 inf_status->stop_soon = stop_soon;
3700 /* Save original bpstat chain here; replace it with copy of chain.
3701 If caller's caller is walking the chain, they'll be happier if we
3702 hand them back the original chain when restore_inferior_status is
3704 inf_status->stop_bpstat = stop_bpstat;
3705 stop_bpstat = bpstat_copy (stop_bpstat);
3706 inf_status->breakpoint_proceeded = breakpoint_proceeded;
3707 inf_status->restore_stack_info = restore_stack_info;
3708 inf_status->proceed_to_finish = proceed_to_finish;
3710 inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers);
3712 inf_status->registers = regcache_dup (current_regcache);
3714 inf_status->selected_frame_id = get_frame_id (deprecated_selected_frame);
3719 restore_selected_frame (void *args)
3721 struct frame_id *fid = (struct frame_id *) args;
3722 struct frame_info *frame;
3724 frame = frame_find_by_id (*fid);
3726 /* If inf_status->selected_frame_id is NULL, there was no previously
3730 warning ("Unable to restore previously selected frame.\n");
3734 select_frame (frame);
3740 restore_inferior_status (struct inferior_status *inf_status)
3742 stop_signal = inf_status->stop_signal;
3743 stop_pc = inf_status->stop_pc;
3744 stop_step = inf_status->stop_step;
3745 stop_stack_dummy = inf_status->stop_stack_dummy;
3746 stopped_by_random_signal = inf_status->stopped_by_random_signal;
3747 trap_expected = inf_status->trap_expected;
3748 step_range_start = inf_status->step_range_start;
3749 step_range_end = inf_status->step_range_end;
3750 step_frame_id = inf_status->step_frame_id;
3751 step_over_calls = inf_status->step_over_calls;
3752 stop_after_trap = inf_status->stop_after_trap;
3753 stop_soon = inf_status->stop_soon;
3754 bpstat_clear (&stop_bpstat);
3755 stop_bpstat = inf_status->stop_bpstat;
3756 breakpoint_proceeded = inf_status->breakpoint_proceeded;
3757 proceed_to_finish = inf_status->proceed_to_finish;
3759 /* FIXME: Is the restore of stop_registers always needed. */
3760 regcache_xfree (stop_registers);
3761 stop_registers = inf_status->stop_registers;
3763 /* The inferior can be gone if the user types "print exit(0)"
3764 (and perhaps other times). */
3765 if (target_has_execution)
3766 /* NB: The register write goes through to the target. */
3767 regcache_cpy (current_regcache, inf_status->registers);
3768 regcache_xfree (inf_status->registers);
3770 /* FIXME: If we are being called after stopping in a function which
3771 is called from gdb, we should not be trying to restore the
3772 selected frame; it just prints a spurious error message (The
3773 message is useful, however, in detecting bugs in gdb (like if gdb
3774 clobbers the stack)). In fact, should we be restoring the
3775 inferior status at all in that case? . */
3777 if (target_has_stack && inf_status->restore_stack_info)
3779 /* The point of catch_errors is that if the stack is clobbered,
3780 walking the stack might encounter a garbage pointer and
3781 error() trying to dereference it. */
3783 (restore_selected_frame, &inf_status->selected_frame_id,
3784 "Unable to restore previously selected frame:\n",
3785 RETURN_MASK_ERROR) == 0)
3786 /* Error in restoring the selected frame. Select the innermost
3788 select_frame (get_current_frame ());
3796 do_restore_inferior_status_cleanup (void *sts)
3798 restore_inferior_status (sts);
3802 make_cleanup_restore_inferior_status (struct inferior_status *inf_status)
3804 return make_cleanup (do_restore_inferior_status_cleanup, inf_status);
3808 discard_inferior_status (struct inferior_status *inf_status)
3810 /* See save_inferior_status for info on stop_bpstat. */
3811 bpstat_clear (&inf_status->stop_bpstat);
3812 regcache_xfree (inf_status->registers);
3813 regcache_xfree (inf_status->stop_registers);
3818 inferior_has_forked (int pid, int *child_pid)
3820 struct target_waitstatus last;
3823 get_last_target_status (&last_ptid, &last);
3825 if (last.kind != TARGET_WAITKIND_FORKED)
3828 if (ptid_get_pid (last_ptid) != pid)
3831 *child_pid = last.value.related_pid;
3836 inferior_has_vforked (int pid, int *child_pid)
3838 struct target_waitstatus last;
3841 get_last_target_status (&last_ptid, &last);
3843 if (last.kind != TARGET_WAITKIND_VFORKED)
3846 if (ptid_get_pid (last_ptid) != pid)
3849 *child_pid = last.value.related_pid;
3854 inferior_has_execd (int pid, char **execd_pathname)
3856 struct target_waitstatus last;
3859 get_last_target_status (&last_ptid, &last);
3861 if (last.kind != TARGET_WAITKIND_EXECD)
3864 if (ptid_get_pid (last_ptid) != pid)
3867 *execd_pathname = xstrdup (last.value.execd_pathname);
3871 /* Oft used ptids */
3873 ptid_t minus_one_ptid;
3875 /* Create a ptid given the necessary PID, LWP, and TID components. */
3878 ptid_build (int pid, long lwp, long tid)
3888 /* Create a ptid from just a pid. */
3891 pid_to_ptid (int pid)
3893 return ptid_build (pid, 0, 0);
3896 /* Fetch the pid (process id) component from a ptid. */
3899 ptid_get_pid (ptid_t ptid)
3904 /* Fetch the lwp (lightweight process) component from a ptid. */
3907 ptid_get_lwp (ptid_t ptid)
3912 /* Fetch the tid (thread id) component from a ptid. */
3915 ptid_get_tid (ptid_t ptid)
3920 /* ptid_equal() is used to test equality of two ptids. */
3923 ptid_equal (ptid_t ptid1, ptid_t ptid2)
3925 return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp
3926 && ptid1.tid == ptid2.tid);
3929 /* restore_inferior_ptid() will be used by the cleanup machinery
3930 to restore the inferior_ptid value saved in a call to
3931 save_inferior_ptid(). */
3934 restore_inferior_ptid (void *arg)
3936 ptid_t *saved_ptid_ptr = arg;
3937 inferior_ptid = *saved_ptid_ptr;
3941 /* Save the value of inferior_ptid so that it may be restored by a
3942 later call to do_cleanups(). Returns the struct cleanup pointer
3943 needed for later doing the cleanup. */
3946 save_inferior_ptid (void)
3948 ptid_t *saved_ptid_ptr;
3950 saved_ptid_ptr = xmalloc (sizeof (ptid_t));
3951 *saved_ptid_ptr = inferior_ptid;
3952 return make_cleanup (restore_inferior_ptid, saved_ptid_ptr);
3959 stop_registers = regcache_xmalloc (current_gdbarch);
3963 _initialize_infrun (void)
3967 struct cmd_list_element *c;
3969 register_gdbarch_swap (&stop_registers, sizeof (stop_registers), NULL);
3970 register_gdbarch_swap (NULL, 0, build_infrun);
3972 add_info ("signals", signals_info,
3973 "What debugger does when program gets various signals.\n\
3974 Specify a signal as argument to print info on that signal only.");
3975 add_info_alias ("handle", "signals", 0);
3977 add_com ("handle", class_run, handle_command,
3978 concat ("Specify how to handle a signal.\n\
3979 Args are signals and actions to apply to those signals.\n\
3980 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
3981 from 1-15 are allowed for compatibility with old versions of GDB.\n\
3982 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
3983 The special arg \"all\" is recognized to mean all signals except those\n\
3984 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
3985 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
3986 Stop means reenter debugger if this signal happens (implies print).\n\
3987 Print means print a message if this signal happens.\n\
3988 Pass means let program see this signal; otherwise program doesn't know.\n\
3989 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
3990 Pass and Stop may be combined.", NULL));
3993 add_com ("lz", class_info, signals_info,
3994 "What debugger does when program gets various signals.\n\
3995 Specify a signal as argument to print info on that signal only.");
3996 add_com ("z", class_run, xdb_handle_command,
3997 concat ("Specify how to handle a signal.\n\
3998 Args are signals and actions to apply to those signals.\n\
3999 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
4000 from 1-15 are allowed for compatibility with old versions of GDB.\n\
4001 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
4002 The special arg \"all\" is recognized to mean all signals except those\n\
4003 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\
4004 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
4005 nopass), \"Q\" (noprint)\n\
4006 Stop means reenter debugger if this signal happens (implies print).\n\
4007 Print means print a message if this signal happens.\n\
4008 Pass means let program see this signal; otherwise program doesn't know.\n\
4009 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
4010 Pass and Stop may be combined.", NULL));
4015 add_cmd ("stop", class_obscure, not_just_help_class_command, "There is no `stop' command, but you can set a hook on `stop'.\n\
4016 This allows you to set a list of commands to be run each time execution\n\
4017 of the program stops.", &cmdlist);
4019 numsigs = (int) TARGET_SIGNAL_LAST;
4020 signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs);
4021 signal_print = (unsigned char *)
4022 xmalloc (sizeof (signal_print[0]) * numsigs);
4023 signal_program = (unsigned char *)
4024 xmalloc (sizeof (signal_program[0]) * numsigs);
4025 for (i = 0; i < numsigs; i++)
4028 signal_print[i] = 1;
4029 signal_program[i] = 1;
4032 /* Signals caused by debugger's own actions
4033 should not be given to the program afterwards. */
4034 signal_program[TARGET_SIGNAL_TRAP] = 0;
4035 signal_program[TARGET_SIGNAL_INT] = 0;
4037 /* Signals that are not errors should not normally enter the debugger. */
4038 signal_stop[TARGET_SIGNAL_ALRM] = 0;
4039 signal_print[TARGET_SIGNAL_ALRM] = 0;
4040 signal_stop[TARGET_SIGNAL_VTALRM] = 0;
4041 signal_print[TARGET_SIGNAL_VTALRM] = 0;
4042 signal_stop[TARGET_SIGNAL_PROF] = 0;
4043 signal_print[TARGET_SIGNAL_PROF] = 0;
4044 signal_stop[TARGET_SIGNAL_CHLD] = 0;
4045 signal_print[TARGET_SIGNAL_CHLD] = 0;
4046 signal_stop[TARGET_SIGNAL_IO] = 0;
4047 signal_print[TARGET_SIGNAL_IO] = 0;
4048 signal_stop[TARGET_SIGNAL_POLL] = 0;
4049 signal_print[TARGET_SIGNAL_POLL] = 0;
4050 signal_stop[TARGET_SIGNAL_URG] = 0;
4051 signal_print[TARGET_SIGNAL_URG] = 0;
4052 signal_stop[TARGET_SIGNAL_WINCH] = 0;
4053 signal_print[TARGET_SIGNAL_WINCH] = 0;
4055 /* These signals are used internally by user-level thread
4056 implementations. (See signal(5) on Solaris.) Like the above
4057 signals, a healthy program receives and handles them as part of
4058 its normal operation. */
4059 signal_stop[TARGET_SIGNAL_LWP] = 0;
4060 signal_print[TARGET_SIGNAL_LWP] = 0;
4061 signal_stop[TARGET_SIGNAL_WAITING] = 0;
4062 signal_print[TARGET_SIGNAL_WAITING] = 0;
4063 signal_stop[TARGET_SIGNAL_CANCEL] = 0;
4064 signal_print[TARGET_SIGNAL_CANCEL] = 0;
4068 (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger,
4069 (char *) &stop_on_solib_events,
4070 "Set stopping for shared library events.\n\
4071 If nonzero, gdb will give control to the user when the dynamic linker\n\
4072 notifies gdb of shared library events. The most common event of interest\n\
4073 to the user would be loading/unloading of a new library.\n", &setlist), &showlist);
4076 c = add_set_enum_cmd ("follow-fork-mode",
4078 follow_fork_mode_kind_names, &follow_fork_mode_string,
4079 /* ??rehrauer: The "both" option is broken, by what may be a 10.20
4080 kernel problem. It's also not terribly useful without a GUI to
4081 help the user drive two debuggers. So for now, I'm disabling
4082 the "both" option. */
4083 /* "Set debugger response to a program call of fork \
4085 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4086 parent - the original process is debugged after a fork\n\
4087 child - the new process is debugged after a fork\n\
4088 both - both the parent and child are debugged after a fork\n\
4089 ask - the debugger will ask for one of the above choices\n\
4090 For \"both\", another copy of the debugger will be started to follow\n\
4091 the new child process. The original debugger will continue to follow\n\
4092 the original parent process. To distinguish their prompts, the\n\
4093 debugger copy's prompt will be changed.\n\
4094 For \"parent\" or \"child\", the unfollowed process will run free.\n\
4095 By default, the debugger will follow the parent process.",
4097 "Set debugger response to a program call of fork \
4099 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4100 parent - the original process is debugged after a fork\n\
4101 child - the new process is debugged after a fork\n\
4102 ask - the debugger will ask for one of the above choices\n\
4103 For \"parent\" or \"child\", the unfollowed process will run free.\n\
4104 By default, the debugger will follow the parent process.", &setlist);
4105 add_show_from_set (c, &showlist);
4107 c = add_set_enum_cmd ("scheduler-locking", class_run, scheduler_enums, /* array of string names */
4108 &scheduler_mode, /* current mode */
4109 "Set mode for locking scheduler during execution.\n\
4110 off == no locking (threads may preempt at any time)\n\
4111 on == full locking (no thread except the current thread may run)\n\
4112 step == scheduler locked during every single-step operation.\n\
4113 In this mode, no other thread may run during a step command.\n\
4114 Other threads may run while stepping over a function call ('next').", &setlist);
4116 set_cmd_sfunc (c, set_schedlock_func); /* traps on target vector */
4117 add_show_from_set (c, &showlist);
4119 c = add_set_cmd ("step-mode", class_run,
4120 var_boolean, (char *) &step_stop_if_no_debug,
4121 "Set mode of the step operation. When set, doing a step over a\n\
4122 function without debug line information will stop at the first\n\
4123 instruction of that function. Otherwise, the function is skipped and\n\
4124 the step command stops at a different source line.", &setlist);
4125 add_show_from_set (c, &showlist);
4127 /* ptid initializations */
4128 null_ptid = ptid_build (0, 0, 0);
4129 minus_one_ptid = ptid_build (-1, 0, 0);
4130 inferior_ptid = null_ptid;
4131 target_last_wait_ptid = minus_one_ptid;