1 /* Target-struct-independent code to start (run) and stop an inferior
4 Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
5 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free
6 Software Foundation, Inc.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 59 Temple Place - Suite 330,
23 Boston, MA 02111-1307, USA. */
26 #include "gdb_string.h"
31 #include "breakpoint.h"
35 #include "cli/cli-script.h"
37 #include "gdbthread.h"
47 #include "gdb_assert.h"
49 /* Prototypes for local functions */
51 static void signals_info (char *, int);
53 static void handle_command (char *, int);
55 static void sig_print_info (enum target_signal);
57 static void sig_print_header (void);
59 static void resume_cleanups (void *);
61 static int hook_stop_stub (void *);
63 static void delete_breakpoint_current_contents (void *);
65 static int restore_selected_frame (void *);
67 static void build_infrun (void);
69 static int follow_fork (void);
71 static void set_schedlock_func (char *args, int from_tty,
72 struct cmd_list_element *c);
74 struct execution_control_state;
76 static int currently_stepping (struct execution_control_state *ecs);
78 static void xdb_handle_command (char *args, int from_tty);
80 static int prepare_to_proceed (void);
82 void _initialize_infrun (void);
84 int inferior_ignoring_startup_exec_events = 0;
85 int inferior_ignoring_leading_exec_events = 0;
87 /* When set, stop the 'step' command if we enter a function which has
88 no line number information. The normal behavior is that we step
89 over such function. */
90 int step_stop_if_no_debug = 0;
92 /* In asynchronous mode, but simulating synchronous execution. */
94 int sync_execution = 0;
96 /* wait_for_inferior and normal_stop use this to notify the user
97 when the inferior stopped in a different thread than it had been
100 static ptid_t previous_inferior_ptid;
102 /* This is true for configurations that may follow through execl() and
103 similar functions. At present this is only true for HP-UX native. */
105 #ifndef MAY_FOLLOW_EXEC
106 #define MAY_FOLLOW_EXEC (0)
109 static int may_follow_exec = MAY_FOLLOW_EXEC;
111 /* If the program uses ELF-style shared libraries, then calls to
112 functions in shared libraries go through stubs, which live in a
113 table called the PLT (Procedure Linkage Table). The first time the
114 function is called, the stub sends control to the dynamic linker,
115 which looks up the function's real address, patches the stub so
116 that future calls will go directly to the function, and then passes
117 control to the function.
119 If we are stepping at the source level, we don't want to see any of
120 this --- we just want to skip over the stub and the dynamic linker.
121 The simple approach is to single-step until control leaves the
124 However, on some systems (e.g., Red Hat's 5.2 distribution) the
125 dynamic linker calls functions in the shared C library, so you
126 can't tell from the PC alone whether the dynamic linker is still
127 running. In this case, we use a step-resume breakpoint to get us
128 past the dynamic linker, as if we were using "next" to step over a
131 IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic
132 linker code or not. Normally, this means we single-step. However,
133 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
134 address where we can place a step-resume breakpoint to get past the
135 linker's symbol resolution function.
137 IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a
138 pretty portable way, by comparing the PC against the address ranges
139 of the dynamic linker's sections.
141 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
142 it depends on internal details of the dynamic linker. It's usually
143 not too hard to figure out where to put a breakpoint, but it
144 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
145 sanity checking. If it can't figure things out, returning zero and
146 getting the (possibly confusing) stepping behavior is better than
147 signalling an error, which will obscure the change in the
150 #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE
151 #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0
154 /* This function returns TRUE if pc is the address of an instruction
155 that lies within the dynamic linker (such as the event hook, or the
158 This function must be used only when a dynamic linker event has
159 been caught, and the inferior is being stepped out of the hook, or
160 undefined results are guaranteed. */
162 #ifndef SOLIB_IN_DYNAMIC_LINKER
163 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
166 /* On MIPS16, a function that returns a floating point value may call
167 a library helper function to copy the return value to a floating point
168 register. The IGNORE_HELPER_CALL macro returns non-zero if we
169 should ignore (i.e. step over) this function call. */
170 #ifndef IGNORE_HELPER_CALL
171 #define IGNORE_HELPER_CALL(pc) 0
174 /* On some systems, the PC may be left pointing at an instruction that won't
175 actually be executed. This is usually indicated by a bit in the PSW. If
176 we find ourselves in such a state, then we step the target beyond the
177 nullified instruction before returning control to the user so as to avoid
180 #ifndef INSTRUCTION_NULLIFIED
181 #define INSTRUCTION_NULLIFIED 0
184 /* We can't step off a permanent breakpoint in the ordinary way, because we
185 can't remove it. Instead, we have to advance the PC to the next
186 instruction. This macro should expand to a pointer to a function that
187 does that, or zero if we have no such function. If we don't have a
188 definition for it, we have to report an error. */
189 #ifndef SKIP_PERMANENT_BREAKPOINT
190 #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint)
192 default_skip_permanent_breakpoint (void)
195 The program is stopped at a permanent breakpoint, but GDB does not know\n\
196 how to step past a permanent breakpoint on this architecture. Try using\n\
197 a command like `return' or `jump' to continue execution.");
202 /* Convert the #defines into values. This is temporary until wfi control
203 flow is completely sorted out. */
205 #ifndef HAVE_STEPPABLE_WATCHPOINT
206 #define HAVE_STEPPABLE_WATCHPOINT 0
208 #undef HAVE_STEPPABLE_WATCHPOINT
209 #define HAVE_STEPPABLE_WATCHPOINT 1
212 #ifndef CANNOT_STEP_HW_WATCHPOINTS
213 #define CANNOT_STEP_HW_WATCHPOINTS 0
215 #undef CANNOT_STEP_HW_WATCHPOINTS
216 #define CANNOT_STEP_HW_WATCHPOINTS 1
219 /* Tables of how to react to signals; the user sets them. */
221 static unsigned char *signal_stop;
222 static unsigned char *signal_print;
223 static unsigned char *signal_program;
225 #define SET_SIGS(nsigs,sigs,flags) \
227 int signum = (nsigs); \
228 while (signum-- > 0) \
229 if ((sigs)[signum]) \
230 (flags)[signum] = 1; \
233 #define UNSET_SIGS(nsigs,sigs,flags) \
235 int signum = (nsigs); \
236 while (signum-- > 0) \
237 if ((sigs)[signum]) \
238 (flags)[signum] = 0; \
241 /* Value to pass to target_resume() to cause all threads to resume */
243 #define RESUME_ALL (pid_to_ptid (-1))
245 /* Command list pointer for the "stop" placeholder. */
247 static struct cmd_list_element *stop_command;
249 /* Nonzero if breakpoints are now inserted in the inferior. */
251 static int breakpoints_inserted;
253 /* Function inferior was in as of last step command. */
255 static struct symbol *step_start_function;
257 /* Nonzero if we are expecting a trace trap and should proceed from it. */
259 static int trap_expected;
262 /* Nonzero if we want to give control to the user when we're notified
263 of shared library events by the dynamic linker. */
264 static int stop_on_solib_events;
268 /* Nonzero if the next time we try to continue the inferior, it will
269 step one instruction and generate a spurious trace trap.
270 This is used to compensate for a bug in HP-UX. */
272 static int trap_expected_after_continue;
275 /* Nonzero means expecting a trace trap
276 and should stop the inferior and return silently when it happens. */
280 /* Nonzero means expecting a trap and caller will handle it themselves.
281 It is used after attach, due to attaching to a process;
282 when running in the shell before the child program has been exec'd;
283 and when running some kinds of remote stuff (FIXME?). */
285 enum stop_kind stop_soon;
287 /* Nonzero if proceed is being used for a "finish" command or a similar
288 situation when stop_registers should be saved. */
290 int proceed_to_finish;
292 /* Save register contents here when about to pop a stack dummy frame,
293 if-and-only-if proceed_to_finish is set.
294 Thus this contains the return value from the called function (assuming
295 values are returned in a register). */
297 struct regcache *stop_registers;
299 /* Nonzero if program stopped due to error trying to insert breakpoints. */
301 static int breakpoints_failed;
303 /* Nonzero after stop if current stack frame should be printed. */
305 static int stop_print_frame;
307 static struct breakpoint *step_resume_breakpoint = NULL;
308 static struct breakpoint *through_sigtramp_breakpoint = NULL;
310 /* On some platforms (e.g., HP-UX), hardware watchpoints have bad
311 interactions with an inferior that is running a kernel function
312 (aka, a system call or "syscall"). wait_for_inferior therefore
313 may have a need to know when the inferior is in a syscall. This
314 is a count of the number of inferior threads which are known to
315 currently be running in a syscall. */
316 static int number_of_threads_in_syscalls;
318 /* This is a cached copy of the pid/waitstatus of the last event
319 returned by target_wait()/target_wait_hook(). This information is
320 returned by get_last_target_status(). */
321 static ptid_t target_last_wait_ptid;
322 static struct target_waitstatus target_last_waitstatus;
324 /* This is used to remember when a fork, vfork or exec event
325 was caught by a catchpoint, and thus the event is to be
326 followed at the next resume of the inferior, and not
330 enum target_waitkind kind;
337 char *execd_pathname;
341 static const char follow_fork_mode_child[] = "child";
342 static const char follow_fork_mode_parent[] = "parent";
344 static const char *follow_fork_mode_kind_names[] = {
345 follow_fork_mode_child,
346 follow_fork_mode_parent,
350 static const char *follow_fork_mode_string = follow_fork_mode_parent;
356 int follow_child = (follow_fork_mode_string == follow_fork_mode_child);
358 return target_follow_fork (follow_child);
362 follow_inferior_reset_breakpoints (void)
364 /* Was there a step_resume breakpoint? (There was if the user
365 did a "next" at the fork() call.) If so, explicitly reset its
368 step_resumes are a form of bp that are made to be per-thread.
369 Since we created the step_resume bp when the parent process
370 was being debugged, and now are switching to the child process,
371 from the breakpoint package's viewpoint, that's a switch of
372 "threads". We must update the bp's notion of which thread
373 it is for, or it'll be ignored when it triggers. */
375 if (step_resume_breakpoint)
376 breakpoint_re_set_thread (step_resume_breakpoint);
378 /* Reinsert all breakpoints in the child. The user may have set
379 breakpoints after catching the fork, in which case those
380 were never set in the child, but only in the parent. This makes
381 sure the inserted breakpoints match the breakpoint list. */
383 breakpoint_re_set ();
384 insert_breakpoints ();
387 /* EXECD_PATHNAME is assumed to be non-NULL. */
390 follow_exec (int pid, char *execd_pathname)
393 struct target_ops *tgt;
395 if (!may_follow_exec)
398 /* This is an exec event that we actually wish to pay attention to.
399 Refresh our symbol table to the newly exec'd program, remove any
402 If there are breakpoints, they aren't really inserted now,
403 since the exec() transformed our inferior into a fresh set
406 We want to preserve symbolic breakpoints on the list, since
407 we have hopes that they can be reset after the new a.out's
408 symbol table is read.
410 However, any "raw" breakpoints must be removed from the list
411 (e.g., the solib bp's), since their address is probably invalid
414 And, we DON'T want to call delete_breakpoints() here, since
415 that may write the bp's "shadow contents" (the instruction
416 value that was overwritten witha TRAP instruction). Since
417 we now have a new a.out, those shadow contents aren't valid. */
418 update_breakpoints_after_exec ();
420 /* If there was one, it's gone now. We cannot truly step-to-next
421 statement through an exec(). */
422 step_resume_breakpoint = NULL;
423 step_range_start = 0;
426 /* If there was one, it's gone now. */
427 through_sigtramp_breakpoint = NULL;
429 /* What is this a.out's name? */
430 printf_unfiltered ("Executing new program: %s\n", execd_pathname);
432 /* We've followed the inferior through an exec. Therefore, the
433 inferior has essentially been killed & reborn. */
435 /* First collect the run target in effect. */
436 tgt = find_run_target ();
437 /* If we can't find one, things are in a very strange state... */
439 error ("Could find run target to save before following exec");
441 gdb_flush (gdb_stdout);
442 target_mourn_inferior ();
443 inferior_ptid = pid_to_ptid (saved_pid);
444 /* Because mourn_inferior resets inferior_ptid. */
447 /* That a.out is now the one to use. */
448 exec_file_attach (execd_pathname, 0);
450 /* And also is where symbols can be found. */
451 symbol_file_add_main (execd_pathname, 0);
453 /* Reset the shared library package. This ensures that we get
454 a shlib event when the child reaches "_start", at which point
455 the dld will have had a chance to initialize the child. */
456 #if defined(SOLIB_RESTART)
459 #ifdef SOLIB_CREATE_INFERIOR_HOOK
460 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid));
463 /* Reinsert all breakpoints. (Those which were symbolic have
464 been reset to the proper address in the new a.out, thanks
465 to symbol_file_command...) */
466 insert_breakpoints ();
468 /* The next resume of this inferior should bring it to the shlib
469 startup breakpoints. (If the user had also set bp's on
470 "main" from the old (parent) process, then they'll auto-
471 matically get reset there in the new process.) */
474 /* Non-zero if we just simulating a single-step. This is needed
475 because we cannot remove the breakpoints in the inferior process
476 until after the `wait' in `wait_for_inferior'. */
477 static int singlestep_breakpoints_inserted_p = 0;
479 /* The thread we inserted single-step breakpoints for. */
480 static ptid_t singlestep_ptid;
482 /* If another thread hit the singlestep breakpoint, we save the original
483 thread here so that we can resume single-stepping it later. */
484 static ptid_t saved_singlestep_ptid;
485 static int stepping_past_singlestep_breakpoint;
488 /* Things to clean up if we QUIT out of resume (). */
490 resume_cleanups (void *ignore)
495 static const char schedlock_off[] = "off";
496 static const char schedlock_on[] = "on";
497 static const char schedlock_step[] = "step";
498 static const char *scheduler_mode = schedlock_off;
499 static const char *scheduler_enums[] = {
507 set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c)
509 /* NOTE: cagney/2002-03-17: The add_show_from_set() function clones
510 the set command passed as a parameter. The clone operation will
511 include (BUG?) any ``set'' command callback, if present.
512 Commands like ``info set'' call all the ``show'' command
513 callbacks. Unfortunately, for ``show'' commands cloned from
514 ``set'', this includes callbacks belonging to ``set'' commands.
515 Making this worse, this only occures if add_show_from_set() is
516 called after add_cmd_sfunc() (BUG?). */
517 if (cmd_type (c) == set_cmd)
518 if (!target_can_lock_scheduler)
520 scheduler_mode = schedlock_off;
521 error ("Target '%s' cannot support this command.", target_shortname);
526 /* Resume the inferior, but allow a QUIT. This is useful if the user
527 wants to interrupt some lengthy single-stepping operation
528 (for child processes, the SIGINT goes to the inferior, and so
529 we get a SIGINT random_signal, but for remote debugging and perhaps
530 other targets, that's not true).
532 STEP nonzero if we should step (zero to continue instead).
533 SIG is the signal to give the inferior (zero for none). */
535 resume (int step, enum target_signal sig)
537 int should_resume = 1;
538 struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0);
541 /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */
544 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
545 over an instruction that causes a page fault without triggering
546 a hardware watchpoint. The kernel properly notices that it shouldn't
547 stop, because the hardware watchpoint is not triggered, but it forgets
548 the step request and continues the program normally.
549 Work around the problem by removing hardware watchpoints if a step is
550 requested, GDB will check for a hardware watchpoint trigger after the
552 if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted)
553 remove_hw_watchpoints ();
556 /* Normally, by the time we reach `resume', the breakpoints are either
557 removed or inserted, as appropriate. The exception is if we're sitting
558 at a permanent breakpoint; we need to step over it, but permanent
559 breakpoints can't be removed. So we have to test for it here. */
560 if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here)
561 SKIP_PERMANENT_BREAKPOINT ();
563 if (SOFTWARE_SINGLE_STEP_P () && step)
565 /* Do it the hard way, w/temp breakpoints */
566 SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ );
567 /* ...and don't ask hardware to do it. */
569 /* and do not pull these breakpoints until after a `wait' in
570 `wait_for_inferior' */
571 singlestep_breakpoints_inserted_p = 1;
572 singlestep_ptid = inferior_ptid;
575 /* Handle any optimized stores to the inferior NOW... */
576 #ifdef DO_DEFERRED_STORES
580 /* If there were any forks/vforks/execs that were caught and are
581 now to be followed, then do so. */
582 switch (pending_follow.kind)
584 case TARGET_WAITKIND_FORKED:
585 case TARGET_WAITKIND_VFORKED:
586 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
591 case TARGET_WAITKIND_EXECD:
592 /* follow_exec is called as soon as the exec event is seen. */
593 pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
600 /* Install inferior's terminal modes. */
601 target_terminal_inferior ();
607 resume_ptid = RESUME_ALL; /* Default */
609 if ((step || singlestep_breakpoints_inserted_p) &&
610 (stepping_past_singlestep_breakpoint
611 || (!breakpoints_inserted && breakpoint_here_p (read_pc ()))))
613 /* Stepping past a breakpoint without inserting breakpoints.
614 Make sure only the current thread gets to step, so that
615 other threads don't sneak past breakpoints while they are
618 resume_ptid = inferior_ptid;
621 if ((scheduler_mode == schedlock_on) ||
622 (scheduler_mode == schedlock_step &&
623 (step || singlestep_breakpoints_inserted_p)))
625 /* User-settable 'scheduler' mode requires solo thread resume. */
626 resume_ptid = inferior_ptid;
629 if (CANNOT_STEP_BREAKPOINT)
631 /* Most targets can step a breakpoint instruction, thus
632 executing it normally. But if this one cannot, just
633 continue and we will hit it anyway. */
634 if (step && breakpoints_inserted && breakpoint_here_p (read_pc ()))
637 target_resume (resume_ptid, step, sig);
640 discard_cleanups (old_cleanups);
644 /* Clear out all variables saying what to do when inferior is continued.
645 First do this, then set the ones you want, then call `proceed'. */
648 clear_proceed_status (void)
651 step_range_start = 0;
653 step_frame_id = null_frame_id;
654 step_over_calls = STEP_OVER_UNDEBUGGABLE;
656 stop_soon = NO_STOP_QUIETLY;
657 proceed_to_finish = 0;
658 breakpoint_proceeded = 1; /* We're about to proceed... */
660 /* Discard any remaining commands or status from previous stop. */
661 bpstat_clear (&stop_bpstat);
664 /* This should be suitable for any targets that support threads. */
667 prepare_to_proceed (void)
670 struct target_waitstatus wait_status;
672 /* Get the last target status returned by target_wait(). */
673 get_last_target_status (&wait_ptid, &wait_status);
675 /* Make sure we were stopped either at a breakpoint, or because
677 if (wait_status.kind != TARGET_WAITKIND_STOPPED
678 || (wait_status.value.sig != TARGET_SIGNAL_TRAP &&
679 wait_status.value.sig != TARGET_SIGNAL_INT))
684 if (!ptid_equal (wait_ptid, minus_one_ptid)
685 && !ptid_equal (inferior_ptid, wait_ptid))
687 /* Switched over from WAIT_PID. */
688 CORE_ADDR wait_pc = read_pc_pid (wait_ptid);
690 if (wait_pc != read_pc ())
692 /* Switch back to WAIT_PID thread. */
693 inferior_ptid = wait_ptid;
695 /* FIXME: This stuff came from switch_to_thread() in
696 thread.c (which should probably be a public function). */
697 flush_cached_frames ();
698 registers_changed ();
700 select_frame (get_current_frame ());
703 /* We return 1 to indicate that there is a breakpoint here,
704 so we need to step over it before continuing to avoid
705 hitting it straight away. */
706 if (breakpoint_here_p (wait_pc))
714 /* Record the pc of the program the last time it stopped. This is
715 just used internally by wait_for_inferior, but need to be preserved
716 over calls to it and cleared when the inferior is started. */
717 static CORE_ADDR prev_pc;
719 /* Basic routine for continuing the program in various fashions.
721 ADDR is the address to resume at, or -1 for resume where stopped.
722 SIGGNAL is the signal to give it, or 0 for none,
723 or -1 for act according to how it stopped.
724 STEP is nonzero if should trap after one instruction.
725 -1 means return after that and print nothing.
726 You should probably set various step_... variables
727 before calling here, if you are stepping.
729 You should call clear_proceed_status before calling proceed. */
732 proceed (CORE_ADDR addr, enum target_signal siggnal, int step)
737 step_start_function = find_pc_function (read_pc ());
741 if (addr == (CORE_ADDR) -1)
743 /* If there is a breakpoint at the address we will resume at,
744 step one instruction before inserting breakpoints
745 so that we do not stop right away (and report a second
746 hit at this breakpoint). */
748 if (read_pc () == stop_pc && breakpoint_here_p (read_pc ()))
751 #ifndef STEP_SKIPS_DELAY
752 #define STEP_SKIPS_DELAY(pc) (0)
753 #define STEP_SKIPS_DELAY_P (0)
755 /* Check breakpoint_here_p first, because breakpoint_here_p is fast
756 (it just checks internal GDB data structures) and STEP_SKIPS_DELAY
757 is slow (it needs to read memory from the target). */
758 if (STEP_SKIPS_DELAY_P
759 && breakpoint_here_p (read_pc () + 4)
760 && STEP_SKIPS_DELAY (read_pc ()))
768 /* In a multi-threaded task we may select another thread
769 and then continue or step.
771 But if the old thread was stopped at a breakpoint, it
772 will immediately cause another breakpoint stop without
773 any execution (i.e. it will report a breakpoint hit
774 incorrectly). So we must step over it first.
776 prepare_to_proceed checks the current thread against the thread
777 that reported the most recent event. If a step-over is required
778 it returns TRUE and sets the current thread to the old thread. */
779 if (prepare_to_proceed () && breakpoint_here_p (read_pc ()))
783 if (trap_expected_after_continue)
785 /* If (step == 0), a trap will be automatically generated after
786 the first instruction is executed. Force step one
787 instruction to clear this condition. This should not occur
788 if step is nonzero, but it is harmless in that case. */
790 trap_expected_after_continue = 0;
792 #endif /* HP_OS_BUG */
795 /* We will get a trace trap after one instruction.
796 Continue it automatically and insert breakpoints then. */
800 insert_breakpoints ();
801 /* If we get here there was no call to error() in
802 insert breakpoints -- so they were inserted. */
803 breakpoints_inserted = 1;
806 if (siggnal != TARGET_SIGNAL_DEFAULT)
807 stop_signal = siggnal;
808 /* If this signal should not be seen by program,
809 give it zero. Used for debugging signals. */
810 else if (!signal_program[stop_signal])
811 stop_signal = TARGET_SIGNAL_0;
813 annotate_starting ();
815 /* Make sure that output from GDB appears before output from the
817 gdb_flush (gdb_stdout);
819 /* Refresh prev_pc value just prior to resuming. This used to be
820 done in stop_stepping, however, setting prev_pc there did not handle
821 scenarios such as inferior function calls or returning from
822 a function via the return command. In those cases, the prev_pc
823 value was not set properly for subsequent commands. The prev_pc value
824 is used to initialize the starting line number in the ecs. With an
825 invalid value, the gdb next command ends up stopping at the position
826 represented by the next line table entry past our start position.
827 On platforms that generate one line table entry per line, this
828 is not a problem. However, on the ia64, the compiler generates
829 extraneous line table entries that do not increase the line number.
830 When we issue the gdb next command on the ia64 after an inferior call
831 or a return command, we often end up a few instructions forward, still
832 within the original line we started.
834 An attempt was made to have init_execution_control_state () refresh
835 the prev_pc value before calculating the line number. This approach
836 did not work because on platforms that use ptrace, the pc register
837 cannot be read unless the inferior is stopped. At that point, we
838 are not guaranteed the inferior is stopped and so the read_pc ()
839 call can fail. Setting the prev_pc value here ensures the value is
840 updated correctly when the inferior is stopped. */
841 prev_pc = read_pc ();
843 /* Resume inferior. */
844 resume (oneproc || step || bpstat_should_step (), stop_signal);
846 /* Wait for it to stop (if not standalone)
847 and in any case decode why it stopped, and act accordingly. */
848 /* Do this only if we are not using the event loop, or if the target
849 does not support asynchronous execution. */
850 if (!event_loop_p || !target_can_async_p ())
852 wait_for_inferior ();
858 /* Start remote-debugging of a machine over a serial link. */
864 init_wait_for_inferior ();
865 stop_soon = STOP_QUIETLY;
868 /* Always go on waiting for the target, regardless of the mode. */
869 /* FIXME: cagney/1999-09-23: At present it isn't possible to
870 indicate to wait_for_inferior that a target should timeout if
871 nothing is returned (instead of just blocking). Because of this,
872 targets expecting an immediate response need to, internally, set
873 things up so that the target_wait() is forced to eventually
875 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
876 differentiate to its caller what the state of the target is after
877 the initial open has been performed. Here we're assuming that
878 the target has stopped. It should be possible to eventually have
879 target_open() return to the caller an indication that the target
880 is currently running and GDB state should be set to the same as
882 wait_for_inferior ();
886 /* Initialize static vars when a new inferior begins. */
889 init_wait_for_inferior (void)
891 /* These are meaningless until the first time through wait_for_inferior. */
895 trap_expected_after_continue = 0;
897 breakpoints_inserted = 0;
898 breakpoint_init_inferior (inf_starting);
900 /* Don't confuse first call to proceed(). */
901 stop_signal = TARGET_SIGNAL_0;
903 /* The first resume is not following a fork/vfork/exec. */
904 pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */
906 /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */
907 number_of_threads_in_syscalls = 0;
909 clear_proceed_status ();
911 stepping_past_singlestep_breakpoint = 0;
915 delete_breakpoint_current_contents (void *arg)
917 struct breakpoint **breakpointp = (struct breakpoint **) arg;
918 if (*breakpointp != NULL)
920 delete_breakpoint (*breakpointp);
925 /* This enum encodes possible reasons for doing a target_wait, so that
926 wfi can call target_wait in one place. (Ultimately the call will be
927 moved out of the infinite loop entirely.) */
931 infwait_normal_state,
932 infwait_thread_hop_state,
933 infwait_nullified_state,
934 infwait_nonstep_watch_state
937 /* Why did the inferior stop? Used to print the appropriate messages
938 to the interface from within handle_inferior_event(). */
939 enum inferior_stop_reason
941 /* We don't know why. */
943 /* Step, next, nexti, stepi finished. */
945 /* Found breakpoint. */
947 /* Inferior terminated by signal. */
949 /* Inferior exited. */
951 /* Inferior received signal, and user asked to be notified. */
955 /* This structure contains what used to be local variables in
956 wait_for_inferior. Probably many of them can return to being
957 locals in handle_inferior_event. */
959 struct execution_control_state
961 struct target_waitstatus ws;
962 struct target_waitstatus *wp;
965 CORE_ADDR stop_func_start;
966 CORE_ADDR stop_func_end;
967 char *stop_func_name;
968 struct symtab_and_line sal;
969 int remove_breakpoints_on_following_step;
971 struct symtab *current_symtab;
972 int handling_longjmp; /* FIXME */
974 ptid_t saved_inferior_ptid;
976 int stepping_through_solib_after_catch;
977 bpstat stepping_through_solib_catchpoints;
978 int enable_hw_watchpoints_after_wait;
979 int stepping_through_sigtramp;
980 int new_thread_event;
981 struct target_waitstatus tmpstatus;
982 enum infwait_states infwait_state;
987 void init_execution_control_state (struct execution_control_state *ecs);
989 static void handle_step_into_function (struct execution_control_state *ecs);
990 void handle_inferior_event (struct execution_control_state *ecs);
992 static void check_sigtramp2 (struct execution_control_state *ecs);
993 static void step_into_function (struct execution_control_state *ecs);
994 static void step_over_function (struct execution_control_state *ecs);
995 static void stop_stepping (struct execution_control_state *ecs);
996 static void prepare_to_wait (struct execution_control_state *ecs);
997 static void keep_going (struct execution_control_state *ecs);
998 static void print_stop_reason (enum inferior_stop_reason stop_reason,
1001 /* Wait for control to return from inferior to debugger.
1002 If inferior gets a signal, we may decide to start it up again
1003 instead of returning. That is why there is a loop in this function.
1004 When this function actually returns it means the inferior
1005 should be left stopped and GDB should read more commands. */
1008 wait_for_inferior (void)
1010 struct cleanup *old_cleanups;
1011 struct execution_control_state ecss;
1012 struct execution_control_state *ecs;
1014 old_cleanups = make_cleanup (delete_step_resume_breakpoint,
1015 &step_resume_breakpoint);
1016 make_cleanup (delete_breakpoint_current_contents,
1017 &through_sigtramp_breakpoint);
1019 /* wfi still stays in a loop, so it's OK just to take the address of
1020 a local to get the ecs pointer. */
1023 /* Fill in with reasonable starting values. */
1024 init_execution_control_state (ecs);
1026 /* We'll update this if & when we switch to a new thread. */
1027 previous_inferior_ptid = inferior_ptid;
1029 overlay_cache_invalid = 1;
1031 /* We have to invalidate the registers BEFORE calling target_wait
1032 because they can be loaded from the target while in target_wait.
1033 This makes remote debugging a bit more efficient for those
1034 targets that provide critical registers as part of their normal
1035 status mechanism. */
1037 registers_changed ();
1041 if (target_wait_hook)
1042 ecs->ptid = target_wait_hook (ecs->waiton_ptid, ecs->wp);
1044 ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp);
1046 /* Now figure out what to do with the result of the result. */
1047 handle_inferior_event (ecs);
1049 if (!ecs->wait_some_more)
1052 do_cleanups (old_cleanups);
1055 /* Asynchronous version of wait_for_inferior. It is called by the
1056 event loop whenever a change of state is detected on the file
1057 descriptor corresponding to the target. It can be called more than
1058 once to complete a single execution command. In such cases we need
1059 to keep the state in a global variable ASYNC_ECSS. If it is the
1060 last time that this function is called for a single execution
1061 command, then report to the user that the inferior has stopped, and
1062 do the necessary cleanups. */
1064 struct execution_control_state async_ecss;
1065 struct execution_control_state *async_ecs;
1068 fetch_inferior_event (void *client_data)
1070 static struct cleanup *old_cleanups;
1072 async_ecs = &async_ecss;
1074 if (!async_ecs->wait_some_more)
1076 old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint,
1077 &step_resume_breakpoint);
1078 make_exec_cleanup (delete_breakpoint_current_contents,
1079 &through_sigtramp_breakpoint);
1081 /* Fill in with reasonable starting values. */
1082 init_execution_control_state (async_ecs);
1084 /* We'll update this if & when we switch to a new thread. */
1085 previous_inferior_ptid = inferior_ptid;
1087 overlay_cache_invalid = 1;
1089 /* We have to invalidate the registers BEFORE calling target_wait
1090 because they can be loaded from the target while in target_wait.
1091 This makes remote debugging a bit more efficient for those
1092 targets that provide critical registers as part of their normal
1093 status mechanism. */
1095 registers_changed ();
1098 if (target_wait_hook)
1100 target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp);
1102 async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp);
1104 /* Now figure out what to do with the result of the result. */
1105 handle_inferior_event (async_ecs);
1107 if (!async_ecs->wait_some_more)
1109 /* Do only the cleanups that have been added by this
1110 function. Let the continuations for the commands do the rest,
1111 if there are any. */
1112 do_exec_cleanups (old_cleanups);
1114 if (step_multi && stop_step)
1115 inferior_event_handler (INF_EXEC_CONTINUE, NULL);
1117 inferior_event_handler (INF_EXEC_COMPLETE, NULL);
1121 /* Prepare an execution control state for looping through a
1122 wait_for_inferior-type loop. */
1125 init_execution_control_state (struct execution_control_state *ecs)
1127 /* ecs->another_trap? */
1128 ecs->random_signal = 0;
1129 ecs->remove_breakpoints_on_following_step = 0;
1130 ecs->handling_longjmp = 0; /* FIXME */
1131 ecs->update_step_sp = 0;
1132 ecs->stepping_through_solib_after_catch = 0;
1133 ecs->stepping_through_solib_catchpoints = NULL;
1134 ecs->enable_hw_watchpoints_after_wait = 0;
1135 ecs->stepping_through_sigtramp = 0;
1136 ecs->sal = find_pc_line (prev_pc, 0);
1137 ecs->current_line = ecs->sal.line;
1138 ecs->current_symtab = ecs->sal.symtab;
1139 ecs->infwait_state = infwait_normal_state;
1140 ecs->waiton_ptid = pid_to_ptid (-1);
1141 ecs->wp = &(ecs->ws);
1144 /* Call this function before setting step_resume_breakpoint, as a
1145 sanity check. There should never be more than one step-resume
1146 breakpoint per thread, so we should never be setting a new
1147 step_resume_breakpoint when one is already active. */
1149 check_for_old_step_resume_breakpoint (void)
1151 if (step_resume_breakpoint)
1153 ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint");
1156 /* Return the cached copy of the last pid/waitstatus returned by
1157 target_wait()/target_wait_hook(). The data is actually cached by
1158 handle_inferior_event(), which gets called immediately after
1159 target_wait()/target_wait_hook(). */
1162 get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status)
1164 *ptidp = target_last_wait_ptid;
1165 *status = target_last_waitstatus;
1168 /* Switch thread contexts, maintaining "infrun state". */
1171 context_switch (struct execution_control_state *ecs)
1173 /* Caution: it may happen that the new thread (or the old one!)
1174 is not in the thread list. In this case we must not attempt
1175 to "switch context", or we run the risk that our context may
1176 be lost. This may happen as a result of the target module
1177 mishandling thread creation. */
1179 if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid))
1180 { /* Perform infrun state context switch: */
1181 /* Save infrun state for the old thread. */
1182 save_infrun_state (inferior_ptid, prev_pc,
1183 trap_expected, step_resume_breakpoint,
1184 through_sigtramp_breakpoint, step_range_start,
1185 step_range_end, &step_frame_id,
1186 ecs->handling_longjmp, ecs->another_trap,
1187 ecs->stepping_through_solib_after_catch,
1188 ecs->stepping_through_solib_catchpoints,
1189 ecs->stepping_through_sigtramp,
1190 ecs->current_line, ecs->current_symtab, step_sp);
1192 /* Load infrun state for the new thread. */
1193 load_infrun_state (ecs->ptid, &prev_pc,
1194 &trap_expected, &step_resume_breakpoint,
1195 &through_sigtramp_breakpoint, &step_range_start,
1196 &step_range_end, &step_frame_id,
1197 &ecs->handling_longjmp, &ecs->another_trap,
1198 &ecs->stepping_through_solib_after_catch,
1199 &ecs->stepping_through_solib_catchpoints,
1200 &ecs->stepping_through_sigtramp,
1201 &ecs->current_line, &ecs->current_symtab, &step_sp);
1203 inferior_ptid = ecs->ptid;
1206 /* Wrapper for PC_IN_SIGTRAMP that takes care of the need to find the
1209 In a classic example of "left hand VS right hand", "infrun.c" was
1210 trying to improve GDB's performance by caching the result of calls
1211 to calls to find_pc_partial_funtion, while at the same time
1212 find_pc_partial_function was also trying to ramp up performance by
1213 caching its most recent return value. The below makes the the
1214 function find_pc_partial_function solely responsibile for
1215 performance issues (the local cache that relied on a global
1216 variable - arrrggg - deleted).
1218 Using the testsuite and gcov, it was found that dropping the local
1219 "infrun.c" cache and instead relying on find_pc_partial_function
1220 increased the number of calls to 12000 (from 10000), but the number
1221 of times find_pc_partial_function's cache missed (this is what
1222 matters) was only increased by only 4 (to 3569). (A quick back of
1223 envelope caculation suggests that the extra 2000 function calls
1224 @1000 extra instructions per call make the 1 MIP VAX testsuite run
1225 take two extra seconds, oops :-)
1227 Long term, this function can be eliminated, replaced by the code:
1228 get_frame_type(current_frame()) == SIGTRAMP_FRAME (for new
1229 architectures this is very cheap). */
1232 pc_in_sigtramp (CORE_ADDR pc)
1235 find_pc_partial_function (pc, &name, NULL, NULL);
1236 return PC_IN_SIGTRAMP (pc, name);
1239 /* Handle the inferior event in the cases when we just stepped
1243 handle_step_into_function (struct execution_control_state *ecs)
1245 CORE_ADDR real_stop_pc;
1247 if ((step_over_calls == STEP_OVER_NONE)
1248 || ((step_range_end == 1)
1249 && in_prologue (prev_pc, ecs->stop_func_start)))
1251 /* I presume that step_over_calls is only 0 when we're
1252 supposed to be stepping at the assembly language level
1253 ("stepi"). Just stop. */
1254 /* Also, maybe we just did a "nexti" inside a prolog,
1255 so we thought it was a subroutine call but it was not.
1256 Stop as well. FENN */
1258 print_stop_reason (END_STEPPING_RANGE, 0);
1259 stop_stepping (ecs);
1263 if (step_over_calls == STEP_OVER_ALL || IGNORE_HELPER_CALL (stop_pc))
1265 /* We're doing a "next". */
1267 if (pc_in_sigtramp (stop_pc)
1268 && frame_id_inner (step_frame_id,
1269 frame_id_build (read_sp (), 0)))
1270 /* We stepped out of a signal handler, and into its
1271 calling trampoline. This is misdetected as a
1272 subroutine call, but stepping over the signal
1273 trampoline isn't such a bad idea. In order to do that,
1274 we have to ignore the value in step_frame_id, since
1275 that doesn't represent the frame that'll reach when we
1276 return from the signal trampoline. Otherwise we'll
1277 probably continue to the end of the program. */
1278 step_frame_id = null_frame_id;
1280 step_over_function (ecs);
1285 /* If we are in a function call trampoline (a stub between
1286 the calling routine and the real function), locate the real
1287 function. That's what tells us (a) whether we want to step
1288 into it at all, and (b) what prologue we want to run to
1289 the end of, if we do step into it. */
1290 real_stop_pc = skip_language_trampoline (stop_pc);
1291 if (real_stop_pc == 0)
1292 real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc);
1293 if (real_stop_pc != 0)
1294 ecs->stop_func_start = real_stop_pc;
1296 /* If we have line number information for the function we
1297 are thinking of stepping into, step into it.
1299 If there are several symtabs at that PC (e.g. with include
1300 files), just want to know whether *any* of them have line
1301 numbers. find_pc_line handles this. */
1303 struct symtab_and_line tmp_sal;
1305 tmp_sal = find_pc_line (ecs->stop_func_start, 0);
1306 if (tmp_sal.line != 0)
1308 step_into_function (ecs);
1313 /* If we have no line number and the step-stop-if-no-debug
1314 is set, we stop the step so that the user has a chance to
1315 switch in assembly mode. */
1316 if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug)
1319 print_stop_reason (END_STEPPING_RANGE, 0);
1320 stop_stepping (ecs);
1324 step_over_function (ecs);
1330 adjust_pc_after_break (struct execution_control_state *ecs)
1334 /* If this target does not decrement the PC after breakpoints, then
1335 we have nothing to do. */
1336 if (DECR_PC_AFTER_BREAK == 0)
1339 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
1340 we aren't, just return.
1342 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
1343 affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented
1344 by software breakpoints should be handled through the normal breakpoint
1347 NOTE drow/2004-01-31: On some targets, breakpoints may generate
1348 different signals (SIGILL or SIGEMT for instance), but it is less
1349 clear where the PC is pointing afterwards. It may not match
1350 DECR_PC_AFTER_BREAK. I don't know any specific target that generates
1351 these signals at breakpoints (the code has been in GDB since at least
1352 1992) so I can not guess how to handle them here.
1354 In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS
1355 would have the PC after hitting a watchpoint affected by
1356 DECR_PC_AFTER_BREAK. I haven't found any target with both of these set
1357 in GDB history, and it seems unlikely to be correct, so
1358 HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */
1360 if (ecs->ws.kind != TARGET_WAITKIND_STOPPED)
1363 if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP)
1366 /* Find the location where (if we've hit a breakpoint) the breakpoint would
1368 stop_pc = read_pc_pid (ecs->ptid) - DECR_PC_AFTER_BREAK;
1370 /* If we're software-single-stepping, then assume this is a breakpoint.
1371 NOTE drow/2004-01-17: This doesn't check that the PC matches, or that
1372 we're even in the right thread. The software-single-step code needs
1375 If we're not software-single-stepping, then we first check that there
1376 is an enabled software breakpoint at this address. If there is, and
1377 we weren't using hardware-single-step, then we've hit the breakpoint.
1379 If we were using hardware-single-step, we check prev_pc; if we just
1380 stepped over an inserted software breakpoint, then we should decrement
1381 the PC and eventually report hitting the breakpoint. The prev_pc check
1382 prevents us from decrementing the PC if we just stepped over a jump
1383 instruction and landed on the instruction after a breakpoint.
1385 The last bit checks that we didn't hit a breakpoint in a signal handler
1386 without an intervening stop in sigtramp, which is detected by a new
1387 stack pointer value below any usual function calling stack adjustments.
1389 NOTE drow/2004-01-17: I'm not sure that this is necessary. The check
1390 predates checking for software single step at the same time. Also,
1391 if we've moved into a signal handler we should have seen the
1394 if ((SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1395 || (software_breakpoint_inserted_here_p (stop_pc)
1396 && !(currently_stepping (ecs)
1397 && prev_pc != stop_pc
1398 && !(step_range_end && INNER_THAN (read_sp (), (step_sp - 16))))))
1399 write_pc_pid (stop_pc, ecs->ptid);
1402 /* Given an execution control state that has been freshly filled in
1403 by an event from the inferior, figure out what it means and take
1404 appropriate action. */
1407 handle_inferior_event (struct execution_control_state *ecs)
1409 /* NOTE: cagney/2003-03-28: If you're looking at this code and
1410 thinking that the variable stepped_after_stopped_by_watchpoint
1411 isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT,
1412 defined in the file "config/pa/nm-hppah.h", accesses the variable
1413 indirectly. Mutter something rude about the HP merge. */
1414 int stepped_after_stopped_by_watchpoint;
1415 int sw_single_step_trap_p = 0;
1417 /* Cache the last pid/waitstatus. */
1418 target_last_wait_ptid = ecs->ptid;
1419 target_last_waitstatus = *ecs->wp;
1421 adjust_pc_after_break (ecs);
1423 switch (ecs->infwait_state)
1425 case infwait_thread_hop_state:
1426 /* Cancel the waiton_ptid. */
1427 ecs->waiton_ptid = pid_to_ptid (-1);
1428 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1429 is serviced in this loop, below. */
1430 if (ecs->enable_hw_watchpoints_after_wait)
1432 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid));
1433 ecs->enable_hw_watchpoints_after_wait = 0;
1435 stepped_after_stopped_by_watchpoint = 0;
1438 case infwait_normal_state:
1439 /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event
1440 is serviced in this loop, below. */
1441 if (ecs->enable_hw_watchpoints_after_wait)
1443 TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid));
1444 ecs->enable_hw_watchpoints_after_wait = 0;
1446 stepped_after_stopped_by_watchpoint = 0;
1449 case infwait_nullified_state:
1450 stepped_after_stopped_by_watchpoint = 0;
1453 case infwait_nonstep_watch_state:
1454 insert_breakpoints ();
1456 /* FIXME-maybe: is this cleaner than setting a flag? Does it
1457 handle things like signals arriving and other things happening
1458 in combination correctly? */
1459 stepped_after_stopped_by_watchpoint = 1;
1463 internal_error (__FILE__, __LINE__, "bad switch");
1465 ecs->infwait_state = infwait_normal_state;
1467 flush_cached_frames ();
1469 /* If it's a new process, add it to the thread database */
1471 ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid)
1472 && !in_thread_list (ecs->ptid));
1474 if (ecs->ws.kind != TARGET_WAITKIND_EXITED
1475 && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event)
1477 add_thread (ecs->ptid);
1479 ui_out_text (uiout, "[New ");
1480 ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid));
1481 ui_out_text (uiout, "]\n");
1484 /* NOTE: This block is ONLY meant to be invoked in case of a
1485 "thread creation event"! If it is invoked for any other
1486 sort of event (such as a new thread landing on a breakpoint),
1487 the event will be discarded, which is almost certainly
1490 To avoid this, the low-level module (eg. target_wait)
1491 should call in_thread_list and add_thread, so that the
1492 new thread is known by the time we get here. */
1494 /* We may want to consider not doing a resume here in order
1495 to give the user a chance to play with the new thread.
1496 It might be good to make that a user-settable option. */
1498 /* At this point, all threads are stopped (happens
1499 automatically in either the OS or the native code).
1500 Therefore we need to continue all threads in order to
1503 target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0);
1504 prepare_to_wait (ecs);
1509 switch (ecs->ws.kind)
1511 case TARGET_WAITKIND_LOADED:
1512 /* Ignore gracefully during startup of the inferior, as it
1513 might be the shell which has just loaded some objects,
1514 otherwise add the symbols for the newly loaded objects. */
1516 if (stop_soon == NO_STOP_QUIETLY)
1518 /* Remove breakpoints, SOLIB_ADD might adjust
1519 breakpoint addresses via breakpoint_re_set. */
1520 if (breakpoints_inserted)
1521 remove_breakpoints ();
1523 /* Check for any newly added shared libraries if we're
1524 supposed to be adding them automatically. Switch
1525 terminal for any messages produced by
1526 breakpoint_re_set. */
1527 target_terminal_ours_for_output ();
1528 /* NOTE: cagney/2003-11-25: Make certain that the target
1529 stack's section table is kept up-to-date. Architectures,
1530 (e.g., PPC64), use the section table to perform
1531 operations such as address => section name and hence
1532 require the table to contain all sections (including
1533 those found in shared libraries). */
1534 /* NOTE: cagney/2003-11-25: Pass current_target and not
1535 exec_ops to SOLIB_ADD. This is because current GDB is
1536 only tooled to propagate section_table changes out from
1537 the "current_target" (see target_resize_to_sections), and
1538 not up from the exec stratum. This, of course, isn't
1539 right. "infrun.c" should only interact with the
1540 exec/process stratum, instead relying on the target stack
1541 to propagate relevant changes (stop, section table
1542 changed, ...) up to other layers. */
1543 SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add);
1544 target_terminal_inferior ();
1546 /* Reinsert breakpoints and continue. */
1547 if (breakpoints_inserted)
1548 insert_breakpoints ();
1551 resume (0, TARGET_SIGNAL_0);
1552 prepare_to_wait (ecs);
1555 case TARGET_WAITKIND_SPURIOUS:
1556 resume (0, TARGET_SIGNAL_0);
1557 prepare_to_wait (ecs);
1560 case TARGET_WAITKIND_EXITED:
1561 target_terminal_ours (); /* Must do this before mourn anyway */
1562 print_stop_reason (EXITED, ecs->ws.value.integer);
1564 /* Record the exit code in the convenience variable $_exitcode, so
1565 that the user can inspect this again later. */
1566 set_internalvar (lookup_internalvar ("_exitcode"),
1567 value_from_longest (builtin_type_int,
1568 (LONGEST) ecs->ws.value.integer));
1569 gdb_flush (gdb_stdout);
1570 target_mourn_inferior ();
1571 singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */
1572 stop_print_frame = 0;
1573 stop_stepping (ecs);
1576 case TARGET_WAITKIND_SIGNALLED:
1577 stop_print_frame = 0;
1578 stop_signal = ecs->ws.value.sig;
1579 target_terminal_ours (); /* Must do this before mourn anyway */
1581 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
1582 reach here unless the inferior is dead. However, for years
1583 target_kill() was called here, which hints that fatal signals aren't
1584 really fatal on some systems. If that's true, then some changes
1586 target_mourn_inferior ();
1588 print_stop_reason (SIGNAL_EXITED, stop_signal);
1589 singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */
1590 stop_stepping (ecs);
1593 /* The following are the only cases in which we keep going;
1594 the above cases end in a continue or goto. */
1595 case TARGET_WAITKIND_FORKED:
1596 case TARGET_WAITKIND_VFORKED:
1597 stop_signal = TARGET_SIGNAL_TRAP;
1598 pending_follow.kind = ecs->ws.kind;
1600 pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid);
1601 pending_follow.fork_event.child_pid = ecs->ws.value.related_pid;
1603 stop_pc = read_pc ();
1605 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid);
1607 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1609 /* If no catchpoint triggered for this, then keep going. */
1610 if (ecs->random_signal)
1612 stop_signal = TARGET_SIGNAL_0;
1616 goto process_event_stop_test;
1618 case TARGET_WAITKIND_EXECD:
1619 stop_signal = TARGET_SIGNAL_TRAP;
1621 /* NOTE drow/2002-12-05: This code should be pushed down into the
1622 target_wait function. Until then following vfork on HP/UX 10.20
1623 is probably broken by this. Of course, it's broken anyway. */
1624 /* Is this a target which reports multiple exec events per actual
1625 call to exec()? (HP-UX using ptrace does, for example.) If so,
1626 ignore all but the last one. Just resume the exec'r, and wait
1627 for the next exec event. */
1628 if (inferior_ignoring_leading_exec_events)
1630 inferior_ignoring_leading_exec_events--;
1631 if (pending_follow.kind == TARGET_WAITKIND_VFORKED)
1632 ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event.
1634 target_resume (ecs->ptid, 0, TARGET_SIGNAL_0);
1635 prepare_to_wait (ecs);
1638 inferior_ignoring_leading_exec_events =
1639 target_reported_exec_events_per_exec_call () - 1;
1641 pending_follow.execd_pathname =
1642 savestring (ecs->ws.value.execd_pathname,
1643 strlen (ecs->ws.value.execd_pathname));
1645 /* This causes the eventpoints and symbol table to be reset. Must
1646 do this now, before trying to determine whether to stop. */
1647 follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname);
1648 xfree (pending_follow.execd_pathname);
1650 stop_pc = read_pc_pid (ecs->ptid);
1651 ecs->saved_inferior_ptid = inferior_ptid;
1652 inferior_ptid = ecs->ptid;
1654 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid);
1656 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
1657 inferior_ptid = ecs->saved_inferior_ptid;
1659 /* If no catchpoint triggered for this, then keep going. */
1660 if (ecs->random_signal)
1662 stop_signal = TARGET_SIGNAL_0;
1666 goto process_event_stop_test;
1668 /* These syscall events are returned on HP-UX, as part of its
1669 implementation of page-protection-based "hardware" watchpoints.
1670 HP-UX has unfortunate interactions between page-protections and
1671 some system calls. Our solution is to disable hardware watches
1672 when a system call is entered, and reenable them when the syscall
1673 completes. The downside of this is that we may miss the precise
1674 point at which a watched piece of memory is modified. "Oh well."
1676 Note that we may have multiple threads running, which may each
1677 enter syscalls at roughly the same time. Since we don't have a
1678 good notion currently of whether a watched piece of memory is
1679 thread-private, we'd best not have any page-protections active
1680 when any thread is in a syscall. Thus, we only want to reenable
1681 hardware watches when no threads are in a syscall.
1683 Also, be careful not to try to gather much state about a thread
1684 that's in a syscall. It's frequently a losing proposition. */
1685 case TARGET_WAITKIND_SYSCALL_ENTRY:
1686 number_of_threads_in_syscalls++;
1687 if (number_of_threads_in_syscalls == 1)
1689 TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid));
1691 resume (0, TARGET_SIGNAL_0);
1692 prepare_to_wait (ecs);
1695 /* Before examining the threads further, step this thread to
1696 get it entirely out of the syscall. (We get notice of the
1697 event when the thread is just on the verge of exiting a
1698 syscall. Stepping one instruction seems to get it back
1701 Note that although the logical place to reenable h/w watches
1702 is here, we cannot. We cannot reenable them before stepping
1703 the thread (this causes the next wait on the thread to hang).
1705 Nor can we enable them after stepping until we've done a wait.
1706 Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait
1707 here, which will be serviced immediately after the target
1709 case TARGET_WAITKIND_SYSCALL_RETURN:
1710 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0);
1712 if (number_of_threads_in_syscalls > 0)
1714 number_of_threads_in_syscalls--;
1715 ecs->enable_hw_watchpoints_after_wait =
1716 (number_of_threads_in_syscalls == 0);
1718 prepare_to_wait (ecs);
1721 case TARGET_WAITKIND_STOPPED:
1722 stop_signal = ecs->ws.value.sig;
1725 /* We had an event in the inferior, but we are not interested
1726 in handling it at this level. The lower layers have already
1727 done what needs to be done, if anything.
1729 One of the possible circumstances for this is when the
1730 inferior produces output for the console. The inferior has
1731 not stopped, and we are ignoring the event. Another possible
1732 circumstance is any event which the lower level knows will be
1733 reported multiple times without an intervening resume. */
1734 case TARGET_WAITKIND_IGNORE:
1735 prepare_to_wait (ecs);
1739 /* We may want to consider not doing a resume here in order to give
1740 the user a chance to play with the new thread. It might be good
1741 to make that a user-settable option. */
1743 /* At this point, all threads are stopped (happens automatically in
1744 either the OS or the native code). Therefore we need to continue
1745 all threads in order to make progress. */
1746 if (ecs->new_thread_event)
1748 target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0);
1749 prepare_to_wait (ecs);
1753 stop_pc = read_pc_pid (ecs->ptid);
1755 if (stepping_past_singlestep_breakpoint)
1757 gdb_assert (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p);
1758 gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid));
1759 gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid));
1761 stepping_past_singlestep_breakpoint = 0;
1763 /* We've either finished single-stepping past the single-step
1764 breakpoint, or stopped for some other reason. It would be nice if
1765 we could tell, but we can't reliably. */
1766 if (stop_signal == TARGET_SIGNAL_TRAP)
1768 /* Pull the single step breakpoints out of the target. */
1769 SOFTWARE_SINGLE_STEP (0, 0);
1770 singlestep_breakpoints_inserted_p = 0;
1772 ecs->random_signal = 0;
1774 ecs->ptid = saved_singlestep_ptid;
1775 context_switch (ecs);
1777 context_hook (pid_to_thread_id (ecs->ptid));
1779 resume (1, TARGET_SIGNAL_0);
1780 prepare_to_wait (ecs);
1785 stepping_past_singlestep_breakpoint = 0;
1787 /* See if a thread hit a thread-specific breakpoint that was meant for
1788 another thread. If so, then step that thread past the breakpoint,
1791 if (stop_signal == TARGET_SIGNAL_TRAP)
1793 int thread_hop_needed = 0;
1795 /* Check if a regular breakpoint has been hit before checking
1796 for a potential single step breakpoint. Otherwise, GDB will
1797 not see this breakpoint hit when stepping onto breakpoints. */
1798 if (breakpoints_inserted && breakpoint_here_p (stop_pc))
1800 ecs->random_signal = 0;
1801 if (!breakpoint_thread_match (stop_pc, ecs->ptid))
1802 thread_hop_needed = 1;
1804 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1806 ecs->random_signal = 0;
1807 /* The call to in_thread_list is necessary because PTIDs sometimes
1808 change when we go from single-threaded to multi-threaded. If
1809 the singlestep_ptid is still in the list, assume that it is
1810 really different from ecs->ptid. */
1811 if (!ptid_equal (singlestep_ptid, ecs->ptid)
1812 && in_thread_list (singlestep_ptid))
1814 thread_hop_needed = 1;
1815 stepping_past_singlestep_breakpoint = 1;
1816 saved_singlestep_ptid = singlestep_ptid;
1820 if (thread_hop_needed)
1824 /* Saw a breakpoint, but it was hit by the wrong thread.
1827 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1829 /* Pull the single step breakpoints out of the target. */
1830 SOFTWARE_SINGLE_STEP (0, 0);
1831 singlestep_breakpoints_inserted_p = 0;
1834 remove_status = remove_breakpoints ();
1835 /* Did we fail to remove breakpoints? If so, try
1836 to set the PC past the bp. (There's at least
1837 one situation in which we can fail to remove
1838 the bp's: On HP-UX's that use ttrace, we can't
1839 change the address space of a vforking child
1840 process until the child exits (well, okay, not
1841 then either :-) or execs. */
1842 if (remove_status != 0)
1844 /* FIXME! This is obviously non-portable! */
1845 write_pc_pid (stop_pc + 4, ecs->ptid);
1846 /* We need to restart all the threads now,
1847 * unles we're running in scheduler-locked mode.
1848 * Use currently_stepping to determine whether to
1851 /* FIXME MVS: is there any reason not to call resume()? */
1852 if (scheduler_mode == schedlock_on)
1853 target_resume (ecs->ptid,
1854 currently_stepping (ecs), TARGET_SIGNAL_0);
1856 target_resume (RESUME_ALL,
1857 currently_stepping (ecs), TARGET_SIGNAL_0);
1858 prepare_to_wait (ecs);
1863 breakpoints_inserted = 0;
1864 if (!ptid_equal (inferior_ptid, ecs->ptid))
1865 context_switch (ecs);
1866 ecs->waiton_ptid = ecs->ptid;
1867 ecs->wp = &(ecs->ws);
1868 ecs->another_trap = 1;
1870 ecs->infwait_state = infwait_thread_hop_state;
1872 registers_changed ();
1876 else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1878 sw_single_step_trap_p = 1;
1879 ecs->random_signal = 0;
1883 ecs->random_signal = 1;
1885 /* See if something interesting happened to the non-current thread. If
1886 so, then switch to that thread. */
1887 if (!ptid_equal (ecs->ptid, inferior_ptid))
1889 context_switch (ecs);
1892 context_hook (pid_to_thread_id (ecs->ptid));
1894 flush_cached_frames ();
1897 if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p)
1899 /* Pull the single step breakpoints out of the target. */
1900 SOFTWARE_SINGLE_STEP (0, 0);
1901 singlestep_breakpoints_inserted_p = 0;
1904 /* If PC is pointing at a nullified instruction, then step beyond
1905 it so that the user won't be confused when GDB appears to be ready
1908 /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */
1909 if (INSTRUCTION_NULLIFIED)
1911 registers_changed ();
1912 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0);
1914 /* We may have received a signal that we want to pass to
1915 the inferior; therefore, we must not clobber the waitstatus
1918 ecs->infwait_state = infwait_nullified_state;
1919 ecs->waiton_ptid = ecs->ptid;
1920 ecs->wp = &(ecs->tmpstatus);
1921 prepare_to_wait (ecs);
1925 /* It may not be necessary to disable the watchpoint to stop over
1926 it. For example, the PA can (with some kernel cooperation)
1927 single step over a watchpoint without disabling the watchpoint. */
1928 if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1931 prepare_to_wait (ecs);
1935 /* It is far more common to need to disable a watchpoint to step
1936 the inferior over it. FIXME. What else might a debug
1937 register or page protection watchpoint scheme need here? */
1938 if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
1940 /* At this point, we are stopped at an instruction which has
1941 attempted to write to a piece of memory under control of
1942 a watchpoint. The instruction hasn't actually executed
1943 yet. If we were to evaluate the watchpoint expression
1944 now, we would get the old value, and therefore no change
1945 would seem to have occurred.
1947 In order to make watchpoints work `right', we really need
1948 to complete the memory write, and then evaluate the
1949 watchpoint expression. The following code does that by
1950 removing the watchpoint (actually, all watchpoints and
1951 breakpoints), single-stepping the target, re-inserting
1952 watchpoints, and then falling through to let normal
1953 single-step processing handle proceed. Since this
1954 includes evaluating watchpoints, things will come to a
1955 stop in the correct manner. */
1957 remove_breakpoints ();
1958 registers_changed ();
1959 target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */
1961 ecs->waiton_ptid = ecs->ptid;
1962 ecs->wp = &(ecs->ws);
1963 ecs->infwait_state = infwait_nonstep_watch_state;
1964 prepare_to_wait (ecs);
1968 /* It may be possible to simply continue after a watchpoint. */
1969 if (HAVE_CONTINUABLE_WATCHPOINT)
1970 STOPPED_BY_WATCHPOINT (ecs->ws);
1972 ecs->stop_func_start = 0;
1973 ecs->stop_func_end = 0;
1974 ecs->stop_func_name = 0;
1975 /* Don't care about return value; stop_func_start and stop_func_name
1976 will both be 0 if it doesn't work. */
1977 find_pc_partial_function (stop_pc, &ecs->stop_func_name,
1978 &ecs->stop_func_start, &ecs->stop_func_end);
1979 ecs->stop_func_start += FUNCTION_START_OFFSET;
1980 ecs->another_trap = 0;
1981 bpstat_clear (&stop_bpstat);
1983 stop_stack_dummy = 0;
1984 stop_print_frame = 1;
1985 ecs->random_signal = 0;
1986 stopped_by_random_signal = 0;
1987 breakpoints_failed = 0;
1989 /* Look at the cause of the stop, and decide what to do.
1990 The alternatives are:
1991 1) break; to really stop and return to the debugger,
1992 2) drop through to start up again
1993 (set ecs->another_trap to 1 to single step once)
1994 3) set ecs->random_signal to 1, and the decision between 1 and 2
1995 will be made according to the signal handling tables. */
1997 /* First, distinguish signals caused by the debugger from signals
1998 that have to do with the program's own actions. Note that
1999 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
2000 on the operating system version. Here we detect when a SIGILL or
2001 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
2002 something similar for SIGSEGV, since a SIGSEGV will be generated
2003 when we're trying to execute a breakpoint instruction on a
2004 non-executable stack. This happens for call dummy breakpoints
2005 for architectures like SPARC that place call dummies on the
2008 if (stop_signal == TARGET_SIGNAL_TRAP
2009 || (breakpoints_inserted &&
2010 (stop_signal == TARGET_SIGNAL_ILL
2011 || stop_signal == TARGET_SIGNAL_SEGV
2012 || stop_signal == TARGET_SIGNAL_EMT))
2013 || stop_soon == STOP_QUIETLY
2014 || stop_soon == STOP_QUIETLY_NO_SIGSTOP)
2016 if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap)
2018 stop_print_frame = 0;
2019 stop_stepping (ecs);
2023 /* This is originated from start_remote(), start_inferior() and
2024 shared libraries hook functions. */
2025 if (stop_soon == STOP_QUIETLY)
2027 stop_stepping (ecs);
2031 /* This originates from attach_command(). We need to overwrite
2032 the stop_signal here, because some kernels don't ignore a
2033 SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call.
2034 See more comments in inferior.h. */
2035 if (stop_soon == STOP_QUIETLY_NO_SIGSTOP)
2037 stop_stepping (ecs);
2038 if (stop_signal == TARGET_SIGNAL_STOP)
2039 stop_signal = TARGET_SIGNAL_0;
2043 /* Don't even think about breakpoints
2044 if just proceeded over a breakpoint.
2046 However, if we are trying to proceed over a breakpoint
2047 and end up in sigtramp, then through_sigtramp_breakpoint
2048 will be set and we should check whether we've hit the
2050 if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected
2051 && through_sigtramp_breakpoint == NULL)
2052 bpstat_clear (&stop_bpstat);
2055 /* See if there is a breakpoint at the current PC. */
2056 stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid);
2058 /* Following in case break condition called a
2060 stop_print_frame = 1;
2063 /* NOTE: cagney/2003-03-29: These two checks for a random signal
2064 at one stage in the past included checks for an inferior
2065 function call's call dummy's return breakpoint. The original
2066 comment, that went with the test, read:
2068 ``End of a stack dummy. Some systems (e.g. Sony news) give
2069 another signal besides SIGTRAP, so check here as well as
2072 If someone ever tries to get get call dummys on a
2073 non-executable stack to work (where the target would stop
2074 with something like a SIGSEGV), then those tests might need
2075 to be re-instated. Given, however, that the tests were only
2076 enabled when momentary breakpoints were not being used, I
2077 suspect that it won't be the case.
2079 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
2080 be necessary for call dummies on a non-executable stack on
2083 if (stop_signal == TARGET_SIGNAL_TRAP)
2085 = !(bpstat_explains_signal (stop_bpstat)
2087 || (step_range_end && step_resume_breakpoint == NULL));
2090 ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
2091 if (!ecs->random_signal)
2092 stop_signal = TARGET_SIGNAL_TRAP;
2096 /* When we reach this point, we've pretty much decided
2097 that the reason for stopping must've been a random
2098 (unexpected) signal. */
2101 ecs->random_signal = 1;
2103 process_event_stop_test:
2104 /* For the program's own signals, act according to
2105 the signal handling tables. */
2107 if (ecs->random_signal)
2109 /* Signal not for debugging purposes. */
2112 stopped_by_random_signal = 1;
2114 if (signal_print[stop_signal])
2117 target_terminal_ours_for_output ();
2118 print_stop_reason (SIGNAL_RECEIVED, stop_signal);
2120 if (signal_stop[stop_signal])
2122 stop_stepping (ecs);
2125 /* If not going to stop, give terminal back
2126 if we took it away. */
2128 target_terminal_inferior ();
2130 /* Clear the signal if it should not be passed. */
2131 if (signal_program[stop_signal] == 0)
2132 stop_signal = TARGET_SIGNAL_0;
2134 /* I'm not sure whether this needs to be check_sigtramp2 or
2135 whether it could/should be keep_going.
2137 This used to jump to step_over_function if we are stepping,
2140 Suppose the user does a `next' over a function call, and while
2141 that call is in progress, the inferior receives a signal for
2142 which GDB does not stop (i.e., signal_stop[SIG] is false). In
2143 that case, when we reach this point, there is already a
2144 step-resume breakpoint established, right where it should be:
2145 immediately after the function call the user is "next"-ing
2146 over. If we call step_over_function now, two bad things
2149 - we'll create a new breakpoint, at wherever the current
2150 frame's return address happens to be. That could be
2151 anywhere, depending on what function call happens to be on
2152 the top of the stack at that point. Point is, it's probably
2153 not where we need it.
2155 - the existing step-resume breakpoint (which is at the correct
2156 address) will get orphaned: step_resume_breakpoint will point
2157 to the new breakpoint, and the old step-resume breakpoint
2158 will never be cleaned up.
2160 The old behavior was meant to help HP-UX single-step out of
2161 sigtramps. It would place the new breakpoint at prev_pc, which
2162 was certainly wrong. I don't know the details there, so fixing
2163 this probably breaks that. As with anything else, it's up to
2164 the HP-UX maintainer to furnish a fix that doesn't break other
2165 platforms. --JimB, 20 May 1999 */
2166 check_sigtramp2 (ecs);
2171 /* Handle cases caused by hitting a breakpoint. */
2173 CORE_ADDR jmp_buf_pc;
2174 struct bpstat_what what;
2176 what = bpstat_what (stop_bpstat);
2178 if (what.call_dummy)
2180 stop_stack_dummy = 1;
2182 trap_expected_after_continue = 1;
2186 switch (what.main_action)
2188 case BPSTAT_WHAT_SET_LONGJMP_RESUME:
2189 /* If we hit the breakpoint at longjmp, disable it for the
2190 duration of this command. Then, install a temporary
2191 breakpoint at the target of the jmp_buf. */
2192 disable_longjmp_breakpoint ();
2193 remove_breakpoints ();
2194 breakpoints_inserted = 0;
2195 if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc))
2201 /* Need to blow away step-resume breakpoint, as it
2202 interferes with us */
2203 if (step_resume_breakpoint != NULL)
2205 delete_step_resume_breakpoint (&step_resume_breakpoint);
2207 /* Not sure whether we need to blow this away too, but probably
2208 it is like the step-resume breakpoint. */
2209 if (through_sigtramp_breakpoint != NULL)
2211 delete_breakpoint (through_sigtramp_breakpoint);
2212 through_sigtramp_breakpoint = NULL;
2216 /* FIXME - Need to implement nested temporary breakpoints */
2217 if (step_over_calls > 0)
2218 set_longjmp_resume_breakpoint (jmp_buf_pc, get_current_frame ());
2221 set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id);
2222 ecs->handling_longjmp = 1; /* FIXME */
2226 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME:
2227 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE:
2228 remove_breakpoints ();
2229 breakpoints_inserted = 0;
2231 /* FIXME - Need to implement nested temporary breakpoints */
2233 && (frame_id_inner (get_frame_id (get_current_frame ()),
2236 ecs->another_trap = 1;
2241 disable_longjmp_breakpoint ();
2242 ecs->handling_longjmp = 0; /* FIXME */
2243 if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME)
2245 /* else fallthrough */
2247 case BPSTAT_WHAT_SINGLE:
2248 if (breakpoints_inserted)
2250 remove_breakpoints ();
2252 breakpoints_inserted = 0;
2253 ecs->another_trap = 1;
2254 /* Still need to check other stuff, at least the case
2255 where we are stepping and step out of the right range. */
2258 case BPSTAT_WHAT_STOP_NOISY:
2259 stop_print_frame = 1;
2261 /* We are about to nuke the step_resume_breakpoint and
2262 through_sigtramp_breakpoint via the cleanup chain, so
2263 no need to worry about it here. */
2265 stop_stepping (ecs);
2268 case BPSTAT_WHAT_STOP_SILENT:
2269 stop_print_frame = 0;
2271 /* We are about to nuke the step_resume_breakpoint and
2272 through_sigtramp_breakpoint via the cleanup chain, so
2273 no need to worry about it here. */
2275 stop_stepping (ecs);
2278 case BPSTAT_WHAT_STEP_RESUME:
2279 /* This proably demands a more elegant solution, but, yeah
2282 This function's use of the simple variable
2283 step_resume_breakpoint doesn't seem to accomodate
2284 simultaneously active step-resume bp's, although the
2285 breakpoint list certainly can.
2287 If we reach here and step_resume_breakpoint is already
2288 NULL, then apparently we have multiple active
2289 step-resume bp's. We'll just delete the breakpoint we
2290 stopped at, and carry on.
2292 Correction: what the code currently does is delete a
2293 step-resume bp, but it makes no effort to ensure that
2294 the one deleted is the one currently stopped at. MVS */
2296 if (step_resume_breakpoint == NULL)
2298 step_resume_breakpoint =
2299 bpstat_find_step_resume_breakpoint (stop_bpstat);
2301 delete_step_resume_breakpoint (&step_resume_breakpoint);
2304 case BPSTAT_WHAT_THROUGH_SIGTRAMP:
2305 if (through_sigtramp_breakpoint)
2306 delete_breakpoint (through_sigtramp_breakpoint);
2307 through_sigtramp_breakpoint = NULL;
2309 /* If were waiting for a trap, hitting the step_resume_break
2310 doesn't count as getting it. */
2312 ecs->another_trap = 1;
2315 case BPSTAT_WHAT_CHECK_SHLIBS:
2316 case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK:
2319 /* Remove breakpoints, we eventually want to step over the
2320 shlib event breakpoint, and SOLIB_ADD might adjust
2321 breakpoint addresses via breakpoint_re_set. */
2322 if (breakpoints_inserted)
2323 remove_breakpoints ();
2324 breakpoints_inserted = 0;
2326 /* Check for any newly added shared libraries if we're
2327 supposed to be adding them automatically. Switch
2328 terminal for any messages produced by
2329 breakpoint_re_set. */
2330 target_terminal_ours_for_output ();
2331 /* NOTE: cagney/2003-11-25: Make certain that the target
2332 stack's section table is kept up-to-date. Architectures,
2333 (e.g., PPC64), use the section table to perform
2334 operations such as address => section name and hence
2335 require the table to contain all sections (including
2336 those found in shared libraries). */
2337 /* NOTE: cagney/2003-11-25: Pass current_target and not
2338 exec_ops to SOLIB_ADD. This is because current GDB is
2339 only tooled to propagate section_table changes out from
2340 the "current_target" (see target_resize_to_sections), and
2341 not up from the exec stratum. This, of course, isn't
2342 right. "infrun.c" should only interact with the
2343 exec/process stratum, instead relying on the target stack
2344 to propagate relevant changes (stop, section table
2345 changed, ...) up to other layers. */
2346 SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add);
2347 target_terminal_inferior ();
2349 /* Try to reenable shared library breakpoints, additional
2350 code segments in shared libraries might be mapped in now. */
2351 re_enable_breakpoints_in_shlibs ();
2353 /* If requested, stop when the dynamic linker notifies
2354 gdb of events. This allows the user to get control
2355 and place breakpoints in initializer routines for
2356 dynamically loaded objects (among other things). */
2357 if (stop_on_solib_events || stop_stack_dummy)
2359 stop_stepping (ecs);
2363 /* If we stopped due to an explicit catchpoint, then the
2364 (see above) call to SOLIB_ADD pulled in any symbols
2365 from a newly-loaded library, if appropriate.
2367 We do want the inferior to stop, but not where it is
2368 now, which is in the dynamic linker callback. Rather,
2369 we would like it stop in the user's program, just after
2370 the call that caused this catchpoint to trigger. That
2371 gives the user a more useful vantage from which to
2372 examine their program's state. */
2373 else if (what.main_action ==
2374 BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK)
2376 /* ??rehrauer: If I could figure out how to get the
2377 right return PC from here, we could just set a temp
2378 breakpoint and resume. I'm not sure we can without
2379 cracking open the dld's shared libraries and sniffing
2380 their unwind tables and text/data ranges, and that's
2381 not a terribly portable notion.
2383 Until that time, we must step the inferior out of the
2384 dld callback, and also out of the dld itself (and any
2385 code or stubs in libdld.sl, such as "shl_load" and
2386 friends) until we reach non-dld code. At that point,
2387 we can stop stepping. */
2388 bpstat_get_triggered_catchpoints (stop_bpstat,
2390 stepping_through_solib_catchpoints);
2391 ecs->stepping_through_solib_after_catch = 1;
2393 /* Be sure to lift all breakpoints, so the inferior does
2394 actually step past this point... */
2395 ecs->another_trap = 1;
2400 /* We want to step over this breakpoint, then keep going. */
2401 ecs->another_trap = 1;
2408 case BPSTAT_WHAT_LAST:
2409 /* Not a real code, but listed here to shut up gcc -Wall. */
2411 case BPSTAT_WHAT_KEEP_CHECKING:
2416 /* We come here if we hit a breakpoint but should not
2417 stop for it. Possibly we also were stepping
2418 and should stop for that. So fall through and
2419 test for stepping. But, if not stepping,
2422 /* Are we stepping to get the inferior out of the dynamic
2423 linker's hook (and possibly the dld itself) after catching
2425 if (ecs->stepping_through_solib_after_catch)
2427 #if defined(SOLIB_ADD)
2428 /* Have we reached our destination? If not, keep going. */
2429 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc))
2431 ecs->another_trap = 1;
2436 /* Else, stop and report the catchpoint(s) whose triggering
2437 caused us to begin stepping. */
2438 ecs->stepping_through_solib_after_catch = 0;
2439 bpstat_clear (&stop_bpstat);
2440 stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints);
2441 bpstat_clear (&ecs->stepping_through_solib_catchpoints);
2442 stop_print_frame = 1;
2443 stop_stepping (ecs);
2447 if (step_resume_breakpoint)
2449 /* Having a step-resume breakpoint overrides anything
2450 else having to do with stepping commands until
2451 that breakpoint is reached. */
2452 /* I'm not sure whether this needs to be check_sigtramp2 or
2453 whether it could/should be keep_going. */
2454 check_sigtramp2 (ecs);
2459 if (step_range_end == 0)
2461 /* Likewise if we aren't even stepping. */
2462 /* I'm not sure whether this needs to be check_sigtramp2 or
2463 whether it could/should be keep_going. */
2464 check_sigtramp2 (ecs);
2469 /* If stepping through a line, keep going if still within it.
2471 Note that step_range_end is the address of the first instruction
2472 beyond the step range, and NOT the address of the last instruction
2474 if (stop_pc >= step_range_start && stop_pc < step_range_end)
2476 /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal.
2477 So definately need to check for sigtramp here. */
2478 check_sigtramp2 (ecs);
2483 /* We stepped out of the stepping range. */
2485 /* If we are stepping at the source level and entered the runtime
2486 loader dynamic symbol resolution code, we keep on single stepping
2487 until we exit the run time loader code and reach the callee's
2489 if (step_over_calls == STEP_OVER_UNDEBUGGABLE
2490 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc))
2492 CORE_ADDR pc_after_resolver =
2493 gdbarch_skip_solib_resolver (current_gdbarch, stop_pc);
2495 if (pc_after_resolver)
2497 /* Set up a step-resume breakpoint at the address
2498 indicated by SKIP_SOLIB_RESOLVER. */
2499 struct symtab_and_line sr_sal;
2501 sr_sal.pc = pc_after_resolver;
2503 check_for_old_step_resume_breakpoint ();
2504 step_resume_breakpoint =
2505 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2506 if (breakpoints_inserted)
2507 insert_breakpoints ();
2514 /* We can't update step_sp every time through the loop, because
2515 reading the stack pointer would slow down stepping too much.
2516 But we can update it every time we leave the step range. */
2517 ecs->update_step_sp = 1;
2519 /* Did we just take a signal? */
2520 if (pc_in_sigtramp (stop_pc)
2521 && !pc_in_sigtramp (prev_pc)
2522 && INNER_THAN (read_sp (), step_sp))
2524 /* We've just taken a signal; go until we are back to
2525 the point where we took it and one more. */
2527 /* Note: The test above succeeds not only when we stepped
2528 into a signal handler, but also when we step past the last
2529 statement of a signal handler and end up in the return stub
2530 of the signal handler trampoline. To distinguish between
2531 these two cases, check that the frame is INNER_THAN the
2532 previous one below. pai/1997-09-11 */
2536 struct frame_id current_frame = get_frame_id (get_current_frame ());
2538 if (frame_id_inner (current_frame, step_frame_id))
2540 /* We have just taken a signal; go until we are back to
2541 the point where we took it and one more. */
2543 /* This code is needed at least in the following case:
2544 The user types "next" and then a signal arrives (before
2545 the "next" is done). */
2547 /* Note that if we are stopped at a breakpoint, then we need
2548 the step_resume breakpoint to override any breakpoints at
2549 the same location, so that we will still step over the
2550 breakpoint even though the signal happened. */
2551 struct symtab_and_line sr_sal;
2554 sr_sal.symtab = NULL;
2556 sr_sal.pc = prev_pc;
2557 /* We could probably be setting the frame to
2558 step_frame_id; I don't think anyone thought to try it. */
2559 check_for_old_step_resume_breakpoint ();
2560 step_resume_breakpoint =
2561 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2562 if (breakpoints_inserted)
2563 insert_breakpoints ();
2567 /* We just stepped out of a signal handler and into
2568 its calling trampoline.
2570 Normally, we'd call step_over_function from
2571 here, but for some reason GDB can't unwind the
2572 stack correctly to find the real PC for the point
2573 user code where the signal trampoline will return
2574 -- FRAME_SAVED_PC fails, at least on HP-UX 10.20.
2575 But signal trampolines are pretty small stubs of
2576 code, anyway, so it's OK instead to just
2577 single-step out. Note: assuming such trampolines
2578 don't exhibit recursion on any platform... */
2579 find_pc_partial_function (stop_pc, &ecs->stop_func_name,
2580 &ecs->stop_func_start,
2581 &ecs->stop_func_end);
2582 /* Readjust stepping range */
2583 step_range_start = ecs->stop_func_start;
2584 step_range_end = ecs->stop_func_end;
2585 ecs->stepping_through_sigtramp = 1;
2590 /* If this is stepi or nexti, make sure that the stepping range
2591 gets us past that instruction. */
2592 if (step_range_end == 1)
2593 /* FIXME: Does this run afoul of the code below which, if
2594 we step into the middle of a line, resets the stepping
2596 step_range_end = (step_range_start = prev_pc) + 1;
2598 ecs->remove_breakpoints_on_following_step = 1;
2603 if (((stop_pc == ecs->stop_func_start /* Quick test */
2604 || in_prologue (stop_pc, ecs->stop_func_start))
2605 && !IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name))
2606 || IN_SOLIB_CALL_TRAMPOLINE (stop_pc, ecs->stop_func_name)
2607 || ecs->stop_func_name == 0)
2609 /* It's a subroutine call. */
2610 handle_step_into_function (ecs);
2614 /* We've wandered out of the step range. */
2616 ecs->sal = find_pc_line (stop_pc, 0);
2618 if (step_range_end == 1)
2620 /* It is stepi or nexti. We always want to stop stepping after
2623 print_stop_reason (END_STEPPING_RANGE, 0);
2624 stop_stepping (ecs);
2628 /* If we're in the return path from a shared library trampoline,
2629 we want to proceed through the trampoline when stepping. */
2630 if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name))
2632 /* Determine where this trampoline returns. */
2633 CORE_ADDR real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc);
2635 /* Only proceed through if we know where it's going. */
2638 /* And put the step-breakpoint there and go until there. */
2639 struct symtab_and_line sr_sal;
2641 init_sal (&sr_sal); /* initialize to zeroes */
2642 sr_sal.pc = real_stop_pc;
2643 sr_sal.section = find_pc_overlay (sr_sal.pc);
2644 /* Do not specify what the fp should be when we stop
2645 since on some machines the prologue
2646 is where the new fp value is established. */
2647 check_for_old_step_resume_breakpoint ();
2648 step_resume_breakpoint =
2649 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2650 if (breakpoints_inserted)
2651 insert_breakpoints ();
2653 /* Restart without fiddling with the step ranges or
2660 if (ecs->sal.line == 0)
2662 /* We have no line number information. That means to stop
2663 stepping (does this always happen right after one instruction,
2664 when we do "s" in a function with no line numbers,
2665 or can this happen as a result of a return or longjmp?). */
2667 print_stop_reason (END_STEPPING_RANGE, 0);
2668 stop_stepping (ecs);
2672 if ((stop_pc == ecs->sal.pc)
2673 && (ecs->current_line != ecs->sal.line
2674 || ecs->current_symtab != ecs->sal.symtab))
2676 /* We are at the start of a different line. So stop. Note that
2677 we don't stop if we step into the middle of a different line.
2678 That is said to make things like for (;;) statements work
2681 print_stop_reason (END_STEPPING_RANGE, 0);
2682 stop_stepping (ecs);
2686 /* We aren't done stepping.
2688 Optimize by setting the stepping range to the line.
2689 (We might not be in the original line, but if we entered a
2690 new line in mid-statement, we continue stepping. This makes
2691 things like for(;;) statements work better.) */
2693 if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end)
2695 /* If this is the last line of the function, don't keep stepping
2696 (it would probably step us out of the function).
2697 This is particularly necessary for a one-line function,
2698 in which after skipping the prologue we better stop even though
2699 we will be in mid-line. */
2701 print_stop_reason (END_STEPPING_RANGE, 0);
2702 stop_stepping (ecs);
2705 step_range_start = ecs->sal.pc;
2706 step_range_end = ecs->sal.end;
2707 step_frame_id = get_frame_id (get_current_frame ());
2708 ecs->current_line = ecs->sal.line;
2709 ecs->current_symtab = ecs->sal.symtab;
2711 /* In the case where we just stepped out of a function into the
2712 middle of a line of the caller, continue stepping, but
2713 step_frame_id must be modified to current frame */
2715 /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too
2716 generous. It will trigger on things like a step into a frameless
2717 stackless leaf function. I think the logic should instead look
2718 at the unwound frame ID has that should give a more robust
2719 indication of what happened. */
2720 if (step-ID == current-ID)
2721 still stepping in same function;
2722 else if (step-ID == unwind (current-ID))
2723 stepped into a function;
2725 stepped out of a function;
2726 /* Of course this assumes that the frame ID unwind code is robust
2727 and we're willing to introduce frame unwind logic into this
2728 function. Fortunately, those days are nearly upon us. */
2731 struct frame_id current_frame = get_frame_id (get_current_frame ());
2732 if (!(frame_id_inner (current_frame, step_frame_id)))
2733 step_frame_id = current_frame;
2739 /* Are we in the middle of stepping? */
2742 currently_stepping (struct execution_control_state *ecs)
2744 return ((through_sigtramp_breakpoint == NULL
2745 && !ecs->handling_longjmp
2746 && ((step_range_end && step_resume_breakpoint == NULL)
2748 || ecs->stepping_through_solib_after_catch
2749 || bpstat_should_step ());
2753 check_sigtramp2 (struct execution_control_state *ecs)
2756 && pc_in_sigtramp (stop_pc)
2757 && !pc_in_sigtramp (prev_pc)
2758 && INNER_THAN (read_sp (), step_sp))
2760 /* What has happened here is that we have just stepped the
2761 inferior with a signal (because it is a signal which
2762 shouldn't make us stop), thus stepping into sigtramp.
2764 So we need to set a step_resume_break_address breakpoint and
2765 continue until we hit it, and then step. FIXME: This should
2766 be more enduring than a step_resume breakpoint; we should
2767 know that we will later need to keep going rather than
2768 re-hitting the breakpoint here (see the testsuite,
2769 gdb.base/signals.exp where it says "exceedingly difficult"). */
2771 struct symtab_and_line sr_sal;
2773 init_sal (&sr_sal); /* initialize to zeroes */
2774 sr_sal.pc = prev_pc;
2775 sr_sal.section = find_pc_overlay (sr_sal.pc);
2776 /* We perhaps could set the frame if we kept track of what the
2777 frame corresponding to prev_pc was. But we don't, so don't. */
2778 through_sigtramp_breakpoint =
2779 set_momentary_breakpoint (sr_sal, null_frame_id, bp_through_sigtramp);
2780 if (breakpoints_inserted)
2781 insert_breakpoints ();
2783 ecs->remove_breakpoints_on_following_step = 1;
2784 ecs->another_trap = 1;
2788 /* Subroutine call with source code we should not step over. Do step
2789 to the first line of code in it. */
2792 step_into_function (struct execution_control_state *ecs)
2795 struct symtab_and_line sr_sal;
2797 s = find_pc_symtab (stop_pc);
2798 if (s && s->language != language_asm)
2799 ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start);
2801 ecs->sal = find_pc_line (ecs->stop_func_start, 0);
2802 /* Use the step_resume_break to step until the end of the prologue,
2803 even if that involves jumps (as it seems to on the vax under
2805 /* If the prologue ends in the middle of a source line, continue to
2806 the end of that source line (if it is still within the function).
2807 Otherwise, just go to end of prologue. */
2809 && ecs->sal.pc != ecs->stop_func_start
2810 && ecs->sal.end < ecs->stop_func_end)
2811 ecs->stop_func_start = ecs->sal.end;
2813 /* Architectures which require breakpoint adjustment might not be able
2814 to place a breakpoint at the computed address. If so, the test
2815 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
2816 ecs->stop_func_start to an address at which a breakpoint may be
2817 legitimately placed.
2819 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
2820 made, GDB will enter an infinite loop when stepping through
2821 optimized code consisting of VLIW instructions which contain
2822 subinstructions corresponding to different source lines. On
2823 FR-V, it's not permitted to place a breakpoint on any but the
2824 first subinstruction of a VLIW instruction. When a breakpoint is
2825 set, GDB will adjust the breakpoint address to the beginning of
2826 the VLIW instruction. Thus, we need to make the corresponding
2827 adjustment here when computing the stop address. */
2829 if (gdbarch_adjust_breakpoint_address_p (current_gdbarch))
2831 ecs->stop_func_start
2832 = gdbarch_adjust_breakpoint_address (current_gdbarch,
2833 ecs->stop_func_start);
2836 if (ecs->stop_func_start == stop_pc)
2838 /* We are already there: stop now. */
2840 print_stop_reason (END_STEPPING_RANGE, 0);
2841 stop_stepping (ecs);
2846 /* Put the step-breakpoint there and go until there. */
2847 init_sal (&sr_sal); /* initialize to zeroes */
2848 sr_sal.pc = ecs->stop_func_start;
2849 sr_sal.section = find_pc_overlay (ecs->stop_func_start);
2850 /* Do not specify what the fp should be when we stop since on
2851 some machines the prologue is where the new fp value is
2853 check_for_old_step_resume_breakpoint ();
2854 step_resume_breakpoint =
2855 set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume);
2856 if (breakpoints_inserted)
2857 insert_breakpoints ();
2859 /* And make sure stepping stops right away then. */
2860 step_range_end = step_range_start;
2865 /* We've just entered a callee, and we wish to resume until it returns
2866 to the caller. Setting a step_resume breakpoint on the return
2867 address will catch a return from the callee.
2869 However, if the callee is recursing, we want to be careful not to
2870 catch returns of those recursive calls, but only of THIS instance
2873 To do this, we set the step_resume bp's frame to our current
2874 caller's frame (step_frame_id, which is set by the "next" or
2875 "until" command, before execution begins). */
2878 step_over_function (struct execution_control_state *ecs)
2880 struct symtab_and_line sr_sal;
2881 struct frame_id sr_id;
2883 init_sal (&sr_sal); /* initialize to zeros */
2885 /* NOTE: cagney/2003-04-06:
2887 At this point the equality get_frame_pc() == get_frame_func()
2888 should hold. This may make it possible for this code to tell the
2889 frame where it's function is, instead of the reverse. This would
2890 avoid the need to search for the frame's function, which can get
2891 very messy when there is no debug info available (look at the
2892 heuristic find pc start code found in targets like the MIPS). */
2894 /* NOTE: cagney/2003-04-06:
2896 The intent of DEPRECATED_SAVED_PC_AFTER_CALL was to:
2898 - provide a very light weight equivalent to frame_unwind_pc()
2899 (nee FRAME_SAVED_PC) that avoids the prologue analyzer
2901 - avoid handling the case where the PC hasn't been saved in the
2904 Unfortunately, not five lines further down, is a call to
2905 get_frame_id() and that is guarenteed to trigger the prologue
2908 The `correct fix' is for the prologe analyzer to handle the case
2909 where the prologue is incomplete (PC in prologue) and,
2910 consequently, the return pc has not yet been saved. It should be
2911 noted that the prologue analyzer needs to handle this case
2912 anyway: frameless leaf functions that don't save the return PC;
2913 single stepping through a prologue.
2915 The d10v handles all this by bailing out of the prologue analsis
2916 when it reaches the current instruction. */
2918 if (DEPRECATED_SAVED_PC_AFTER_CALL_P ())
2919 sr_sal.pc = ADDR_BITS_REMOVE (DEPRECATED_SAVED_PC_AFTER_CALL (get_current_frame ()));
2921 sr_sal.pc = ADDR_BITS_REMOVE (frame_pc_unwind (get_current_frame ()));
2922 sr_sal.section = find_pc_overlay (sr_sal.pc);
2924 check_for_old_step_resume_breakpoint ();
2926 if (frame_id_p (step_frame_id)
2927 && !IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal.pc))
2928 /* NOTE: cagney/2004-02-27: Use the global state's idea of the
2929 stepping frame ID. I suspect this is done as it is lighter
2930 weight than a call to get_prev_frame. */
2931 sr_id = step_frame_id;
2932 else if (legacy_frame_p (current_gdbarch))
2933 /* NOTE: cagney/2004-02-27: This is the way it was 'cos this is
2934 the way it always was. It should be using the unwound (or
2935 caller's) ID, and not this (or the callee's) ID. It appeared
2936 to work because: legacy architectures used the wrong end of the
2937 frame for the ID.stack (inner-most rather than outer-most) so
2938 that the callee's id.stack (un adjusted) matched the caller's
2939 id.stack giving the "correct" id; more often than not
2940 !IN_SOLIB_DYNSYM_RESOLVE_CODE and hence the code above (it was
2941 originally later in the function) fixed the ID by using global
2943 sr_id = get_frame_id (get_current_frame ());
2945 sr_id = get_frame_id (get_prev_frame (get_current_frame ()));
2947 step_resume_breakpoint = set_momentary_breakpoint (sr_sal, sr_id, bp_step_resume);
2949 if (breakpoints_inserted)
2950 insert_breakpoints ();
2954 stop_stepping (struct execution_control_state *ecs)
2956 /* Let callers know we don't want to wait for the inferior anymore. */
2957 ecs->wait_some_more = 0;
2960 /* This function handles various cases where we need to continue
2961 waiting for the inferior. */
2962 /* (Used to be the keep_going: label in the old wait_for_inferior) */
2965 keep_going (struct execution_control_state *ecs)
2967 /* Save the pc before execution, to compare with pc after stop. */
2968 prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */
2970 if (ecs->update_step_sp)
2971 step_sp = read_sp ();
2972 ecs->update_step_sp = 0;
2974 /* If we did not do break;, it means we should keep running the
2975 inferior and not return to debugger. */
2977 if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP)
2979 /* We took a signal (which we are supposed to pass through to
2980 the inferior, else we'd have done a break above) and we
2981 haven't yet gotten our trap. Simply continue. */
2982 resume (currently_stepping (ecs), stop_signal);
2986 /* Either the trap was not expected, but we are continuing
2987 anyway (the user asked that this signal be passed to the
2990 The signal was SIGTRAP, e.g. it was our signal, but we
2991 decided we should resume from it.
2993 We're going to run this baby now!
2995 Insert breakpoints now, unless we are trying to one-proceed
2996 past a breakpoint. */
2997 /* If we've just finished a special step resume and we don't
2998 want to hit a breakpoint, pull em out. */
2999 if (step_resume_breakpoint == NULL
3000 && through_sigtramp_breakpoint == NULL
3001 && ecs->remove_breakpoints_on_following_step)
3003 ecs->remove_breakpoints_on_following_step = 0;
3004 remove_breakpoints ();
3005 breakpoints_inserted = 0;
3007 else if (!breakpoints_inserted &&
3008 (through_sigtramp_breakpoint != NULL || !ecs->another_trap))
3010 breakpoints_failed = insert_breakpoints ();
3011 if (breakpoints_failed)
3013 stop_stepping (ecs);
3016 breakpoints_inserted = 1;
3019 trap_expected = ecs->another_trap;
3021 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
3022 specifies that such a signal should be delivered to the
3025 Typically, this would occure when a user is debugging a
3026 target monitor on a simulator: the target monitor sets a
3027 breakpoint; the simulator encounters this break-point and
3028 halts the simulation handing control to GDB; GDB, noteing
3029 that the break-point isn't valid, returns control back to the
3030 simulator; the simulator then delivers the hardware
3031 equivalent of a SIGNAL_TRAP to the program being debugged. */
3033 if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal])
3034 stop_signal = TARGET_SIGNAL_0;
3037 resume (currently_stepping (ecs), stop_signal);
3040 prepare_to_wait (ecs);
3043 /* This function normally comes after a resume, before
3044 handle_inferior_event exits. It takes care of any last bits of
3045 housekeeping, and sets the all-important wait_some_more flag. */
3048 prepare_to_wait (struct execution_control_state *ecs)
3050 if (ecs->infwait_state == infwait_normal_state)
3052 overlay_cache_invalid = 1;
3054 /* We have to invalidate the registers BEFORE calling
3055 target_wait because they can be loaded from the target while
3056 in target_wait. This makes remote debugging a bit more
3057 efficient for those targets that provide critical registers
3058 as part of their normal status mechanism. */
3060 registers_changed ();
3061 ecs->waiton_ptid = pid_to_ptid (-1);
3062 ecs->wp = &(ecs->ws);
3064 /* This is the old end of the while loop. Let everybody know we
3065 want to wait for the inferior some more and get called again
3067 ecs->wait_some_more = 1;
3070 /* Print why the inferior has stopped. We always print something when
3071 the inferior exits, or receives a signal. The rest of the cases are
3072 dealt with later on in normal_stop() and print_it_typical(). Ideally
3073 there should be a call to this function from handle_inferior_event()
3074 each time stop_stepping() is called.*/
3076 print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info)
3078 switch (stop_reason)
3081 /* We don't deal with these cases from handle_inferior_event()
3084 case END_STEPPING_RANGE:
3085 /* We are done with a step/next/si/ni command. */
3086 /* For now print nothing. */
3087 /* Print a message only if not in the middle of doing a "step n"
3088 operation for n > 1 */
3089 if (!step_multi || !stop_step)
3090 if (ui_out_is_mi_like_p (uiout))
3091 ui_out_field_string (uiout, "reason", "end-stepping-range");
3093 case BREAKPOINT_HIT:
3094 /* We found a breakpoint. */
3095 /* For now print nothing. */
3098 /* The inferior was terminated by a signal. */
3099 annotate_signalled ();
3100 if (ui_out_is_mi_like_p (uiout))
3101 ui_out_field_string (uiout, "reason", "exited-signalled");
3102 ui_out_text (uiout, "\nProgram terminated with signal ");
3103 annotate_signal_name ();
3104 ui_out_field_string (uiout, "signal-name",
3105 target_signal_to_name (stop_info));
3106 annotate_signal_name_end ();
3107 ui_out_text (uiout, ", ");
3108 annotate_signal_string ();
3109 ui_out_field_string (uiout, "signal-meaning",
3110 target_signal_to_string (stop_info));
3111 annotate_signal_string_end ();
3112 ui_out_text (uiout, ".\n");
3113 ui_out_text (uiout, "The program no longer exists.\n");
3116 /* The inferior program is finished. */
3117 annotate_exited (stop_info);
3120 if (ui_out_is_mi_like_p (uiout))
3121 ui_out_field_string (uiout, "reason", "exited");
3122 ui_out_text (uiout, "\nProgram exited with code ");
3123 ui_out_field_fmt (uiout, "exit-code", "0%o",
3124 (unsigned int) stop_info);
3125 ui_out_text (uiout, ".\n");
3129 if (ui_out_is_mi_like_p (uiout))
3130 ui_out_field_string (uiout, "reason", "exited-normally");
3131 ui_out_text (uiout, "\nProgram exited normally.\n");
3134 case SIGNAL_RECEIVED:
3135 /* Signal received. The signal table tells us to print about
3138 ui_out_text (uiout, "\nProgram received signal ");
3139 annotate_signal_name ();
3140 if (ui_out_is_mi_like_p (uiout))
3141 ui_out_field_string (uiout, "reason", "signal-received");
3142 ui_out_field_string (uiout, "signal-name",
3143 target_signal_to_name (stop_info));
3144 annotate_signal_name_end ();
3145 ui_out_text (uiout, ", ");
3146 annotate_signal_string ();
3147 ui_out_field_string (uiout, "signal-meaning",
3148 target_signal_to_string (stop_info));
3149 annotate_signal_string_end ();
3150 ui_out_text (uiout, ".\n");
3153 internal_error (__FILE__, __LINE__,
3154 "print_stop_reason: unrecognized enum value");
3160 /* Here to return control to GDB when the inferior stops for real.
3161 Print appropriate messages, remove breakpoints, give terminal our modes.
3163 STOP_PRINT_FRAME nonzero means print the executing frame
3164 (pc, function, args, file, line number and line text).
3165 BREAKPOINTS_FAILED nonzero means stop was due to error
3166 attempting to insert breakpoints. */
3171 struct target_waitstatus last;
3174 get_last_target_status (&last_ptid, &last);
3176 /* As with the notification of thread events, we want to delay
3177 notifying the user that we've switched thread context until
3178 the inferior actually stops.
3180 There's no point in saying anything if the inferior has exited.
3181 Note that SIGNALLED here means "exited with a signal", not
3182 "received a signal". */
3183 if (!ptid_equal (previous_inferior_ptid, inferior_ptid)
3184 && target_has_execution
3185 && last.kind != TARGET_WAITKIND_SIGNALLED
3186 && last.kind != TARGET_WAITKIND_EXITED)
3188 target_terminal_ours_for_output ();
3189 printf_filtered ("[Switching to %s]\n",
3190 target_pid_or_tid_to_str (inferior_ptid));
3191 previous_inferior_ptid = inferior_ptid;
3194 /* NOTE drow/2004-01-17: Is this still necessary? */
3195 /* Make sure that the current_frame's pc is correct. This
3196 is a correction for setting up the frame info before doing
3197 DECR_PC_AFTER_BREAK */
3198 if (target_has_execution)
3199 /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to
3200 DECR_PC_AFTER_BREAK, the program counter can change. Ask the
3201 frame code to check for this and sort out any resultant mess.
3202 DECR_PC_AFTER_BREAK needs to just go away. */
3203 deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
3205 if (target_has_execution && breakpoints_inserted)
3207 if (remove_breakpoints ())
3209 target_terminal_ours_for_output ();
3210 printf_filtered ("Cannot remove breakpoints because ");
3211 printf_filtered ("program is no longer writable.\n");
3212 printf_filtered ("It might be running in another process.\n");
3213 printf_filtered ("Further execution is probably impossible.\n");
3216 breakpoints_inserted = 0;
3218 /* Delete the breakpoint we stopped at, if it wants to be deleted.
3219 Delete any breakpoint that is to be deleted at the next stop. */
3221 breakpoint_auto_delete (stop_bpstat);
3223 /* If an auto-display called a function and that got a signal,
3224 delete that auto-display to avoid an infinite recursion. */
3226 if (stopped_by_random_signal)
3227 disable_current_display ();
3229 /* Don't print a message if in the middle of doing a "step n"
3230 operation for n > 1 */
3231 if (step_multi && stop_step)
3234 target_terminal_ours ();
3236 /* Look up the hook_stop and run it (CLI internally handles problem
3237 of stop_command's pre-hook not existing). */
3239 catch_errors (hook_stop_stub, stop_command,
3240 "Error while running hook_stop:\n", RETURN_MASK_ALL);
3242 if (!target_has_stack)
3248 /* Select innermost stack frame - i.e., current frame is frame 0,
3249 and current location is based on that.
3250 Don't do this on return from a stack dummy routine,
3251 or if the program has exited. */
3253 if (!stop_stack_dummy)
3255 select_frame (get_current_frame ());
3257 /* Print current location without a level number, if
3258 we have changed functions or hit a breakpoint.
3259 Print source line if we have one.
3260 bpstat_print() contains the logic deciding in detail
3261 what to print, based on the event(s) that just occurred. */
3263 if (stop_print_frame && deprecated_selected_frame)
3267 int do_frame_printing = 1;
3269 bpstat_ret = bpstat_print (stop_bpstat);
3273 /* FIXME: cagney/2002-12-01: Given that a frame ID does
3274 (or should) carry around the function and does (or
3275 should) use that when doing a frame comparison. */
3277 && frame_id_eq (step_frame_id,
3278 get_frame_id (get_current_frame ()))
3279 && step_start_function == find_pc_function (stop_pc))
3280 source_flag = SRC_LINE; /* finished step, just print source line */
3282 source_flag = SRC_AND_LOC; /* print location and source line */
3284 case PRINT_SRC_AND_LOC:
3285 source_flag = SRC_AND_LOC; /* print location and source line */
3287 case PRINT_SRC_ONLY:
3288 source_flag = SRC_LINE;
3291 source_flag = SRC_LINE; /* something bogus */
3292 do_frame_printing = 0;
3295 internal_error (__FILE__, __LINE__, "Unknown value.");
3297 /* For mi, have the same behavior every time we stop:
3298 print everything but the source line. */
3299 if (ui_out_is_mi_like_p (uiout))
3300 source_flag = LOC_AND_ADDRESS;
3302 if (ui_out_is_mi_like_p (uiout))
3303 ui_out_field_int (uiout, "thread-id",
3304 pid_to_thread_id (inferior_ptid));
3305 /* The behavior of this routine with respect to the source
3307 SRC_LINE: Print only source line
3308 LOCATION: Print only location
3309 SRC_AND_LOC: Print location and source line */
3310 if (do_frame_printing)
3311 print_stack_frame (deprecated_selected_frame, -1, source_flag);
3313 /* Display the auto-display expressions. */
3318 /* Save the function value return registers, if we care.
3319 We might be about to restore their previous contents. */
3320 if (proceed_to_finish)
3321 /* NB: The copy goes through to the target picking up the value of
3322 all the registers. */
3323 regcache_cpy (stop_registers, current_regcache);
3325 if (stop_stack_dummy)
3327 /* Pop the empty frame that contains the stack dummy. POP_FRAME
3328 ends with a setting of the current frame, so we can use that
3330 frame_pop (get_current_frame ());
3331 /* Set stop_pc to what it was before we called the function.
3332 Can't rely on restore_inferior_status because that only gets
3333 called if we don't stop in the called function. */
3334 stop_pc = read_pc ();
3335 select_frame (get_current_frame ());
3339 annotate_stopped ();
3340 observer_notify_normal_stop ();
3344 hook_stop_stub (void *cmd)
3346 execute_cmd_pre_hook ((struct cmd_list_element *) cmd);
3351 signal_stop_state (int signo)
3353 return signal_stop[signo];
3357 signal_print_state (int signo)
3359 return signal_print[signo];
3363 signal_pass_state (int signo)
3365 return signal_program[signo];
3369 signal_stop_update (int signo, int state)
3371 int ret = signal_stop[signo];
3372 signal_stop[signo] = state;
3377 signal_print_update (int signo, int state)
3379 int ret = signal_print[signo];
3380 signal_print[signo] = state;
3385 signal_pass_update (int signo, int state)
3387 int ret = signal_program[signo];
3388 signal_program[signo] = state;
3393 sig_print_header (void)
3396 Signal Stop\tPrint\tPass to program\tDescription\n");
3400 sig_print_info (enum target_signal oursig)
3402 char *name = target_signal_to_name (oursig);
3403 int name_padding = 13 - strlen (name);
3405 if (name_padding <= 0)
3408 printf_filtered ("%s", name);
3409 printf_filtered ("%*.*s ", name_padding, name_padding, " ");
3410 printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No");
3411 printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No");
3412 printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No");
3413 printf_filtered ("%s\n", target_signal_to_string (oursig));
3416 /* Specify how various signals in the inferior should be handled. */
3419 handle_command (char *args, int from_tty)
3422 int digits, wordlen;
3423 int sigfirst, signum, siglast;
3424 enum target_signal oursig;
3427 unsigned char *sigs;
3428 struct cleanup *old_chain;
3432 error_no_arg ("signal to handle");
3435 /* Allocate and zero an array of flags for which signals to handle. */
3437 nsigs = (int) TARGET_SIGNAL_LAST;
3438 sigs = (unsigned char *) alloca (nsigs);
3439 memset (sigs, 0, nsigs);
3441 /* Break the command line up into args. */
3443 argv = buildargv (args);
3448 old_chain = make_cleanup_freeargv (argv);
3450 /* Walk through the args, looking for signal oursigs, signal names, and
3451 actions. Signal numbers and signal names may be interspersed with
3452 actions, with the actions being performed for all signals cumulatively
3453 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
3455 while (*argv != NULL)
3457 wordlen = strlen (*argv);
3458 for (digits = 0; isdigit ((*argv)[digits]); digits++)
3462 sigfirst = siglast = -1;
3464 if (wordlen >= 1 && !strncmp (*argv, "all", wordlen))
3466 /* Apply action to all signals except those used by the
3467 debugger. Silently skip those. */
3470 siglast = nsigs - 1;
3472 else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen))
3474 SET_SIGS (nsigs, sigs, signal_stop);
3475 SET_SIGS (nsigs, sigs, signal_print);
3477 else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen))
3479 UNSET_SIGS (nsigs, sigs, signal_program);
3481 else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen))
3483 SET_SIGS (nsigs, sigs, signal_print);
3485 else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen))
3487 SET_SIGS (nsigs, sigs, signal_program);
3489 else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen))
3491 UNSET_SIGS (nsigs, sigs, signal_stop);
3493 else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen))
3495 SET_SIGS (nsigs, sigs, signal_program);
3497 else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen))
3499 UNSET_SIGS (nsigs, sigs, signal_print);
3500 UNSET_SIGS (nsigs, sigs, signal_stop);
3502 else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen))
3504 UNSET_SIGS (nsigs, sigs, signal_program);
3506 else if (digits > 0)
3508 /* It is numeric. The numeric signal refers to our own
3509 internal signal numbering from target.h, not to host/target
3510 signal number. This is a feature; users really should be
3511 using symbolic names anyway, and the common ones like
3512 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
3514 sigfirst = siglast = (int)
3515 target_signal_from_command (atoi (*argv));
3516 if ((*argv)[digits] == '-')
3519 target_signal_from_command (atoi ((*argv) + digits + 1));
3521 if (sigfirst > siglast)
3523 /* Bet he didn't figure we'd think of this case... */
3531 oursig = target_signal_from_name (*argv);
3532 if (oursig != TARGET_SIGNAL_UNKNOWN)
3534 sigfirst = siglast = (int) oursig;
3538 /* Not a number and not a recognized flag word => complain. */
3539 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv);
3543 /* If any signal numbers or symbol names were found, set flags for
3544 which signals to apply actions to. */
3546 for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++)
3548 switch ((enum target_signal) signum)
3550 case TARGET_SIGNAL_TRAP:
3551 case TARGET_SIGNAL_INT:
3552 if (!allsigs && !sigs[signum])
3554 if (query ("%s is used by the debugger.\n\
3555 Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum)))
3561 printf_unfiltered ("Not confirmed, unchanged.\n");
3562 gdb_flush (gdb_stdout);
3566 case TARGET_SIGNAL_0:
3567 case TARGET_SIGNAL_DEFAULT:
3568 case TARGET_SIGNAL_UNKNOWN:
3569 /* Make sure that "all" doesn't print these. */
3580 target_notice_signals (inferior_ptid);
3584 /* Show the results. */
3585 sig_print_header ();
3586 for (signum = 0; signum < nsigs; signum++)
3590 sig_print_info (signum);
3595 do_cleanups (old_chain);
3599 xdb_handle_command (char *args, int from_tty)
3602 struct cleanup *old_chain;
3604 /* Break the command line up into args. */
3606 argv = buildargv (args);
3611 old_chain = make_cleanup_freeargv (argv);
3612 if (argv[1] != (char *) NULL)
3617 bufLen = strlen (argv[0]) + 20;
3618 argBuf = (char *) xmalloc (bufLen);
3622 enum target_signal oursig;
3624 oursig = target_signal_from_name (argv[0]);
3625 memset (argBuf, 0, bufLen);
3626 if (strcmp (argv[1], "Q") == 0)
3627 sprintf (argBuf, "%s %s", argv[0], "noprint");
3630 if (strcmp (argv[1], "s") == 0)
3632 if (!signal_stop[oursig])
3633 sprintf (argBuf, "%s %s", argv[0], "stop");
3635 sprintf (argBuf, "%s %s", argv[0], "nostop");
3637 else if (strcmp (argv[1], "i") == 0)
3639 if (!signal_program[oursig])
3640 sprintf (argBuf, "%s %s", argv[0], "pass");
3642 sprintf (argBuf, "%s %s", argv[0], "nopass");
3644 else if (strcmp (argv[1], "r") == 0)
3646 if (!signal_print[oursig])
3647 sprintf (argBuf, "%s %s", argv[0], "print");
3649 sprintf (argBuf, "%s %s", argv[0], "noprint");
3655 handle_command (argBuf, from_tty);
3657 printf_filtered ("Invalid signal handling flag.\n");
3662 do_cleanups (old_chain);
3665 /* Print current contents of the tables set by the handle command.
3666 It is possible we should just be printing signals actually used
3667 by the current target (but for things to work right when switching
3668 targets, all signals should be in the signal tables). */
3671 signals_info (char *signum_exp, int from_tty)
3673 enum target_signal oursig;
3674 sig_print_header ();
3678 /* First see if this is a symbol name. */
3679 oursig = target_signal_from_name (signum_exp);
3680 if (oursig == TARGET_SIGNAL_UNKNOWN)
3682 /* No, try numeric. */
3684 target_signal_from_command (parse_and_eval_long (signum_exp));
3686 sig_print_info (oursig);
3690 printf_filtered ("\n");
3691 /* These ugly casts brought to you by the native VAX compiler. */
3692 for (oursig = TARGET_SIGNAL_FIRST;
3693 (int) oursig < (int) TARGET_SIGNAL_LAST;
3694 oursig = (enum target_signal) ((int) oursig + 1))
3698 if (oursig != TARGET_SIGNAL_UNKNOWN
3699 && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0)
3700 sig_print_info (oursig);
3703 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
3706 struct inferior_status
3708 enum target_signal stop_signal;
3712 int stop_stack_dummy;
3713 int stopped_by_random_signal;
3715 CORE_ADDR step_range_start;
3716 CORE_ADDR step_range_end;
3717 struct frame_id step_frame_id;
3718 enum step_over_calls_kind step_over_calls;
3719 CORE_ADDR step_resume_break_address;
3720 int stop_after_trap;
3722 struct regcache *stop_registers;
3724 /* These are here because if call_function_by_hand has written some
3725 registers and then decides to call error(), we better not have changed
3727 struct regcache *registers;
3729 /* A frame unique identifier. */
3730 struct frame_id selected_frame_id;
3732 int breakpoint_proceeded;
3733 int restore_stack_info;
3734 int proceed_to_finish;
3738 write_inferior_status_register (struct inferior_status *inf_status, int regno,
3741 int size = DEPRECATED_REGISTER_RAW_SIZE (regno);
3742 void *buf = alloca (size);
3743 store_signed_integer (buf, size, val);
3744 regcache_raw_write (inf_status->registers, regno, buf);
3747 /* Save all of the information associated with the inferior<==>gdb
3748 connection. INF_STATUS is a pointer to a "struct inferior_status"
3749 (defined in inferior.h). */
3751 struct inferior_status *
3752 save_inferior_status (int restore_stack_info)
3754 struct inferior_status *inf_status = XMALLOC (struct inferior_status);
3756 inf_status->stop_signal = stop_signal;
3757 inf_status->stop_pc = stop_pc;
3758 inf_status->stop_step = stop_step;
3759 inf_status->stop_stack_dummy = stop_stack_dummy;
3760 inf_status->stopped_by_random_signal = stopped_by_random_signal;
3761 inf_status->trap_expected = trap_expected;
3762 inf_status->step_range_start = step_range_start;
3763 inf_status->step_range_end = step_range_end;
3764 inf_status->step_frame_id = step_frame_id;
3765 inf_status->step_over_calls = step_over_calls;
3766 inf_status->stop_after_trap = stop_after_trap;
3767 inf_status->stop_soon = stop_soon;
3768 /* Save original bpstat chain here; replace it with copy of chain.
3769 If caller's caller is walking the chain, they'll be happier if we
3770 hand them back the original chain when restore_inferior_status is
3772 inf_status->stop_bpstat = stop_bpstat;
3773 stop_bpstat = bpstat_copy (stop_bpstat);
3774 inf_status->breakpoint_proceeded = breakpoint_proceeded;
3775 inf_status->restore_stack_info = restore_stack_info;
3776 inf_status->proceed_to_finish = proceed_to_finish;
3778 inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers);
3780 inf_status->registers = regcache_dup (current_regcache);
3782 inf_status->selected_frame_id = get_frame_id (deprecated_selected_frame);
3787 restore_selected_frame (void *args)
3789 struct frame_id *fid = (struct frame_id *) args;
3790 struct frame_info *frame;
3792 frame = frame_find_by_id (*fid);
3794 /* If inf_status->selected_frame_id is NULL, there was no previously
3798 warning ("Unable to restore previously selected frame.\n");
3802 select_frame (frame);
3808 restore_inferior_status (struct inferior_status *inf_status)
3810 stop_signal = inf_status->stop_signal;
3811 stop_pc = inf_status->stop_pc;
3812 stop_step = inf_status->stop_step;
3813 stop_stack_dummy = inf_status->stop_stack_dummy;
3814 stopped_by_random_signal = inf_status->stopped_by_random_signal;
3815 trap_expected = inf_status->trap_expected;
3816 step_range_start = inf_status->step_range_start;
3817 step_range_end = inf_status->step_range_end;
3818 step_frame_id = inf_status->step_frame_id;
3819 step_over_calls = inf_status->step_over_calls;
3820 stop_after_trap = inf_status->stop_after_trap;
3821 stop_soon = inf_status->stop_soon;
3822 bpstat_clear (&stop_bpstat);
3823 stop_bpstat = inf_status->stop_bpstat;
3824 breakpoint_proceeded = inf_status->breakpoint_proceeded;
3825 proceed_to_finish = inf_status->proceed_to_finish;
3827 /* FIXME: Is the restore of stop_registers always needed. */
3828 regcache_xfree (stop_registers);
3829 stop_registers = inf_status->stop_registers;
3831 /* The inferior can be gone if the user types "print exit(0)"
3832 (and perhaps other times). */
3833 if (target_has_execution)
3834 /* NB: The register write goes through to the target. */
3835 regcache_cpy (current_regcache, inf_status->registers);
3836 regcache_xfree (inf_status->registers);
3838 /* FIXME: If we are being called after stopping in a function which
3839 is called from gdb, we should not be trying to restore the
3840 selected frame; it just prints a spurious error message (The
3841 message is useful, however, in detecting bugs in gdb (like if gdb
3842 clobbers the stack)). In fact, should we be restoring the
3843 inferior status at all in that case? . */
3845 if (target_has_stack && inf_status->restore_stack_info)
3847 /* The point of catch_errors is that if the stack is clobbered,
3848 walking the stack might encounter a garbage pointer and
3849 error() trying to dereference it. */
3851 (restore_selected_frame, &inf_status->selected_frame_id,
3852 "Unable to restore previously selected frame:\n",
3853 RETURN_MASK_ERROR) == 0)
3854 /* Error in restoring the selected frame. Select the innermost
3856 select_frame (get_current_frame ());
3864 do_restore_inferior_status_cleanup (void *sts)
3866 restore_inferior_status (sts);
3870 make_cleanup_restore_inferior_status (struct inferior_status *inf_status)
3872 return make_cleanup (do_restore_inferior_status_cleanup, inf_status);
3876 discard_inferior_status (struct inferior_status *inf_status)
3878 /* See save_inferior_status for info on stop_bpstat. */
3879 bpstat_clear (&inf_status->stop_bpstat);
3880 regcache_xfree (inf_status->registers);
3881 regcache_xfree (inf_status->stop_registers);
3886 inferior_has_forked (int pid, int *child_pid)
3888 struct target_waitstatus last;
3891 get_last_target_status (&last_ptid, &last);
3893 if (last.kind != TARGET_WAITKIND_FORKED)
3896 if (ptid_get_pid (last_ptid) != pid)
3899 *child_pid = last.value.related_pid;
3904 inferior_has_vforked (int pid, int *child_pid)
3906 struct target_waitstatus last;
3909 get_last_target_status (&last_ptid, &last);
3911 if (last.kind != TARGET_WAITKIND_VFORKED)
3914 if (ptid_get_pid (last_ptid) != pid)
3917 *child_pid = last.value.related_pid;
3922 inferior_has_execd (int pid, char **execd_pathname)
3924 struct target_waitstatus last;
3927 get_last_target_status (&last_ptid, &last);
3929 if (last.kind != TARGET_WAITKIND_EXECD)
3932 if (ptid_get_pid (last_ptid) != pid)
3935 *execd_pathname = xstrdup (last.value.execd_pathname);
3939 /* Oft used ptids */
3941 ptid_t minus_one_ptid;
3943 /* Create a ptid given the necessary PID, LWP, and TID components. */
3946 ptid_build (int pid, long lwp, long tid)
3956 /* Create a ptid from just a pid. */
3959 pid_to_ptid (int pid)
3961 return ptid_build (pid, 0, 0);
3964 /* Fetch the pid (process id) component from a ptid. */
3967 ptid_get_pid (ptid_t ptid)
3972 /* Fetch the lwp (lightweight process) component from a ptid. */
3975 ptid_get_lwp (ptid_t ptid)
3980 /* Fetch the tid (thread id) component from a ptid. */
3983 ptid_get_tid (ptid_t ptid)
3988 /* ptid_equal() is used to test equality of two ptids. */
3991 ptid_equal (ptid_t ptid1, ptid_t ptid2)
3993 return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp
3994 && ptid1.tid == ptid2.tid);
3997 /* restore_inferior_ptid() will be used by the cleanup machinery
3998 to restore the inferior_ptid value saved in a call to
3999 save_inferior_ptid(). */
4002 restore_inferior_ptid (void *arg)
4004 ptid_t *saved_ptid_ptr = arg;
4005 inferior_ptid = *saved_ptid_ptr;
4009 /* Save the value of inferior_ptid so that it may be restored by a
4010 later call to do_cleanups(). Returns the struct cleanup pointer
4011 needed for later doing the cleanup. */
4014 save_inferior_ptid (void)
4016 ptid_t *saved_ptid_ptr;
4018 saved_ptid_ptr = xmalloc (sizeof (ptid_t));
4019 *saved_ptid_ptr = inferior_ptid;
4020 return make_cleanup (restore_inferior_ptid, saved_ptid_ptr);
4027 stop_registers = regcache_xmalloc (current_gdbarch);
4031 _initialize_infrun (void)
4035 struct cmd_list_element *c;
4037 DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers);
4038 deprecated_register_gdbarch_swap (NULL, 0, build_infrun);
4040 add_info ("signals", signals_info,
4041 "What debugger does when program gets various signals.\n\
4042 Specify a signal as argument to print info on that signal only.");
4043 add_info_alias ("handle", "signals", 0);
4045 add_com ("handle", class_run, handle_command,
4046 concat ("Specify how to handle a signal.\n\
4047 Args are signals and actions to apply to those signals.\n\
4048 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
4049 from 1-15 are allowed for compatibility with old versions of GDB.\n\
4050 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
4051 The special arg \"all\" is recognized to mean all signals except those\n\
4052 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
4053 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
4054 Stop means reenter debugger if this signal happens (implies print).\n\
4055 Print means print a message if this signal happens.\n\
4056 Pass means let program see this signal; otherwise program doesn't know.\n\
4057 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
4058 Pass and Stop may be combined.", NULL));
4061 add_com ("lz", class_info, signals_info,
4062 "What debugger does when program gets various signals.\n\
4063 Specify a signal as argument to print info on that signal only.");
4064 add_com ("z", class_run, xdb_handle_command,
4065 concat ("Specify how to handle a signal.\n\
4066 Args are signals and actions to apply to those signals.\n\
4067 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
4068 from 1-15 are allowed for compatibility with old versions of GDB.\n\
4069 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
4070 The special arg \"all\" is recognized to mean all signals except those\n\
4071 used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\
4072 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
4073 nopass), \"Q\" (noprint)\n\
4074 Stop means reenter debugger if this signal happens (implies print).\n\
4075 Print means print a message if this signal happens.\n\
4076 Pass means let program see this signal; otherwise program doesn't know.\n\
4077 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
4078 Pass and Stop may be combined.", NULL));
4083 add_cmd ("stop", class_obscure, not_just_help_class_command, "There is no `stop' command, but you can set a hook on `stop'.\n\
4084 This allows you to set a list of commands to be run each time execution\n\
4085 of the program stops.", &cmdlist);
4087 numsigs = (int) TARGET_SIGNAL_LAST;
4088 signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs);
4089 signal_print = (unsigned char *)
4090 xmalloc (sizeof (signal_print[0]) * numsigs);
4091 signal_program = (unsigned char *)
4092 xmalloc (sizeof (signal_program[0]) * numsigs);
4093 for (i = 0; i < numsigs; i++)
4096 signal_print[i] = 1;
4097 signal_program[i] = 1;
4100 /* Signals caused by debugger's own actions
4101 should not be given to the program afterwards. */
4102 signal_program[TARGET_SIGNAL_TRAP] = 0;
4103 signal_program[TARGET_SIGNAL_INT] = 0;
4105 /* Signals that are not errors should not normally enter the debugger. */
4106 signal_stop[TARGET_SIGNAL_ALRM] = 0;
4107 signal_print[TARGET_SIGNAL_ALRM] = 0;
4108 signal_stop[TARGET_SIGNAL_VTALRM] = 0;
4109 signal_print[TARGET_SIGNAL_VTALRM] = 0;
4110 signal_stop[TARGET_SIGNAL_PROF] = 0;
4111 signal_print[TARGET_SIGNAL_PROF] = 0;
4112 signal_stop[TARGET_SIGNAL_CHLD] = 0;
4113 signal_print[TARGET_SIGNAL_CHLD] = 0;
4114 signal_stop[TARGET_SIGNAL_IO] = 0;
4115 signal_print[TARGET_SIGNAL_IO] = 0;
4116 signal_stop[TARGET_SIGNAL_POLL] = 0;
4117 signal_print[TARGET_SIGNAL_POLL] = 0;
4118 signal_stop[TARGET_SIGNAL_URG] = 0;
4119 signal_print[TARGET_SIGNAL_URG] = 0;
4120 signal_stop[TARGET_SIGNAL_WINCH] = 0;
4121 signal_print[TARGET_SIGNAL_WINCH] = 0;
4123 /* These signals are used internally by user-level thread
4124 implementations. (See signal(5) on Solaris.) Like the above
4125 signals, a healthy program receives and handles them as part of
4126 its normal operation. */
4127 signal_stop[TARGET_SIGNAL_LWP] = 0;
4128 signal_print[TARGET_SIGNAL_LWP] = 0;
4129 signal_stop[TARGET_SIGNAL_WAITING] = 0;
4130 signal_print[TARGET_SIGNAL_WAITING] = 0;
4131 signal_stop[TARGET_SIGNAL_CANCEL] = 0;
4132 signal_print[TARGET_SIGNAL_CANCEL] = 0;
4136 (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger,
4137 (char *) &stop_on_solib_events,
4138 "Set stopping for shared library events.\n\
4139 If nonzero, gdb will give control to the user when the dynamic linker\n\
4140 notifies gdb of shared library events. The most common event of interest\n\
4141 to the user would be loading/unloading of a new library.\n", &setlist), &showlist);
4144 c = add_set_enum_cmd ("follow-fork-mode",
4146 follow_fork_mode_kind_names, &follow_fork_mode_string,
4147 "Set debugger response to a program call of fork \
4149 A fork or vfork creates a new process. follow-fork-mode can be:\n\
4150 parent - the original process is debugged after a fork\n\
4151 child - the new process is debugged after a fork\n\
4152 The unfollowed process will continue to run.\n\
4153 By default, the debugger will follow the parent process.", &setlist);
4154 add_show_from_set (c, &showlist);
4156 c = add_set_enum_cmd ("scheduler-locking", class_run, scheduler_enums, /* array of string names */
4157 &scheduler_mode, /* current mode */
4158 "Set mode for locking scheduler during execution.\n\
4159 off == no locking (threads may preempt at any time)\n\
4160 on == full locking (no thread except the current thread may run)\n\
4161 step == scheduler locked during every single-step operation.\n\
4162 In this mode, no other thread may run during a step command.\n\
4163 Other threads may run while stepping over a function call ('next').", &setlist);
4165 set_cmd_sfunc (c, set_schedlock_func); /* traps on target vector */
4166 add_show_from_set (c, &showlist);
4168 c = add_set_cmd ("step-mode", class_run,
4169 var_boolean, (char *) &step_stop_if_no_debug,
4170 "Set mode of the step operation. When set, doing a step over a\n\
4171 function without debug line information will stop at the first\n\
4172 instruction of that function. Otherwise, the function is skipped and\n\
4173 the step command stops at a different source line.", &setlist);
4174 add_show_from_set (c, &showlist);
4176 /* ptid initializations */
4177 null_ptid = ptid_build (0, 0, 0);
4178 minus_one_ptid = ptid_build (-1, 0, 0);
4179 inferior_ptid = null_ptid;
4180 target_last_wait_ptid = minus_one_ptid;