1 /* Target-struct-independent code to start (run) and stop an inferior process.
2 Copyright 1986, 1987, 1988, 1989, 1991, 1992, 1993
3 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
27 #include "breakpoint.h"
35 /* unistd.h is needed to #define X_OK */
42 /* Prototypes for local functions */
45 signals_info
PARAMS ((char *, int));
48 handle_command
PARAMS ((char *, int));
51 sig_print_info
PARAMS ((int));
54 sig_print_header
PARAMS ((void));
57 resume_cleanups
PARAMS ((int));
60 hook_stop_stub
PARAMS ((char *));
62 /* GET_LONGJMP_TARGET returns the PC at which longjmp() will resume the
63 program. It needs to examine the jmp_buf argument and extract the PC
64 from it. The return value is non-zero on success, zero otherwise. */
65 #ifndef GET_LONGJMP_TARGET
66 #define GET_LONGJMP_TARGET(PC_ADDR) 0
70 /* Some machines have trampoline code that sits between function callers
71 and the actual functions themselves. If this machine doesn't have
72 such things, disable their processing. */
73 #ifndef SKIP_TRAMPOLINE_CODE
74 #define SKIP_TRAMPOLINE_CODE(pc) 0
77 /* For SVR4 shared libraries, each call goes through a small piece of
78 trampoline code in the ".init" section. IN_SOLIB_TRAMPOLINE evaluates
79 to nonzero if we are current stopped in one of these. */
80 #ifndef IN_SOLIB_TRAMPOLINE
81 #define IN_SOLIB_TRAMPOLINE(pc,name) 0
84 /* On some systems, the PC may be left pointing at an instruction that won't
85 actually be executed. This is usually indicated by a bit in the PSW. If
86 we find ourselves in such a state, then we step the target beyond the
87 nullified instruction before returning control to the user so as to avoid
90 #ifndef INSTRUCTION_NULLIFIED
91 #define INSTRUCTION_NULLIFIED 0
94 /* Tables of how to react to signals; the user sets them. */
96 static unsigned char *signal_stop
;
97 static unsigned char *signal_print
;
98 static unsigned char *signal_program
;
100 #define SET_SIGS(nsigs,sigs,flags) \
102 int signum = (nsigs); \
103 while (signum-- > 0) \
104 if ((sigs)[signum]) \
105 (flags)[signum] = 1; \
108 #define UNSET_SIGS(nsigs,sigs,flags) \
110 int signum = (nsigs); \
111 while (signum-- > 0) \
112 if ((sigs)[signum]) \
113 (flags)[signum] = 0; \
117 /* Command list pointer for the "stop" placeholder. */
119 static struct cmd_list_element
*stop_command
;
121 /* Nonzero if breakpoints are now inserted in the inferior. */
123 static int breakpoints_inserted
;
125 /* Function inferior was in as of last step command. */
127 static struct symbol
*step_start_function
;
129 /* Nonzero if we are expecting a trace trap and should proceed from it. */
131 static int trap_expected
;
133 /* Nonzero if the next time we try to continue the inferior, it will
134 step one instruction and generate a spurious trace trap.
135 This is used to compensate for a bug in HP-UX. */
137 static int trap_expected_after_continue
;
139 /* Nonzero means expecting a trace trap
140 and should stop the inferior and return silently when it happens. */
144 /* Nonzero means expecting a trap and caller will handle it themselves.
145 It is used after attach, due to attaching to a process;
146 when running in the shell before the child program has been exec'd;
147 and when running some kinds of remote stuff (FIXME?). */
149 int stop_soon_quietly
;
151 /* Nonzero if proceed is being used for a "finish" command or a similar
152 situation when stop_registers should be saved. */
154 int proceed_to_finish
;
156 /* Save register contents here when about to pop a stack dummy frame,
157 if-and-only-if proceed_to_finish is set.
158 Thus this contains the return value from the called function (assuming
159 values are returned in a register). */
161 char stop_registers
[REGISTER_BYTES
];
163 /* Nonzero if program stopped due to error trying to insert breakpoints. */
165 static int breakpoints_failed
;
167 /* Nonzero after stop if current stack frame should be printed. */
169 static int stop_print_frame
;
171 #ifdef NO_SINGLE_STEP
172 extern int one_stepped
; /* From machine dependent code */
173 extern void single_step (); /* Same. */
174 #endif /* NO_SINGLE_STEP */
177 /* Things to clean up if we QUIT out of resume (). */
180 resume_cleanups (arg
)
186 /* Resume the inferior, but allow a QUIT. This is useful if the user
187 wants to interrupt some lengthy single-stepping operation
188 (for child processes, the SIGINT goes to the inferior, and so
189 we get a SIGINT random_signal, but for remote debugging and perhaps
190 other targets, that's not true).
192 STEP nonzero if we should step (zero to continue instead).
193 SIG is the signal to give the inferior (zero for none). */
199 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
202 #ifdef CANNOT_STEP_BREAKPOINT
203 /* Most targets can step a breakpoint instruction, thus executing it
204 normally. But if this one cannot, just continue and we will hit
206 if (step
&& breakpoints_inserted
&& breakpoint_here_p (read_pc ()))
210 #ifdef NO_SINGLE_STEP
212 single_step(sig
); /* Do it the hard way, w/temp breakpoints */
213 step
= 0; /* ...and don't ask hardware to do it. */
217 /* Handle any optimized stores to the inferior NOW... */
218 #ifdef DO_DEFERRED_STORES
222 /* Install inferior's terminal modes. */
223 target_terminal_inferior ();
225 target_resume (-1, step
, sig
);
226 discard_cleanups (old_cleanups
);
230 /* Clear out all variables saying what to do when inferior is continued.
231 First do this, then set the ones you want, then call `proceed'. */
234 clear_proceed_status ()
237 step_range_start
= 0;
239 step_frame_address
= 0;
240 step_over_calls
= -1;
242 stop_soon_quietly
= 0;
243 proceed_to_finish
= 0;
244 breakpoint_proceeded
= 1; /* We're about to proceed... */
246 /* Discard any remaining commands or status from previous stop. */
247 bpstat_clear (&stop_bpstat
);
250 /* Basic routine for continuing the program in various fashions.
252 ADDR is the address to resume at, or -1 for resume where stopped.
253 SIGGNAL is the signal to give it, or 0 for none,
254 or -1 for act according to how it stopped.
255 STEP is nonzero if should trap after one instruction.
256 -1 means return after that and print nothing.
257 You should probably set various step_... variables
258 before calling here, if you are stepping.
260 You should call clear_proceed_status before calling proceed. */
263 proceed (addr
, siggnal
, step
)
271 step_start_function
= find_pc_function (read_pc ());
275 if (addr
== (CORE_ADDR
)-1)
277 /* If there is a breakpoint at the address we will resume at,
278 step one instruction before inserting breakpoints
279 so that we do not stop right away. */
281 if (breakpoint_here_p (read_pc ()))
287 if (trap_expected_after_continue
)
289 /* If (step == 0), a trap will be automatically generated after
290 the first instruction is executed. Force step one
291 instruction to clear this condition. This should not occur
292 if step is nonzero, but it is harmless in that case. */
294 trap_expected_after_continue
= 0;
298 /* We will get a trace trap after one instruction.
299 Continue it automatically and insert breakpoints then. */
303 int temp
= insert_breakpoints ();
306 print_sys_errmsg ("ptrace", temp
);
307 error ("Cannot insert breakpoints.\n\
308 The same program may be running in another process.");
310 breakpoints_inserted
= 1;
314 stop_signal
= siggnal
;
315 /* If this signal should not be seen by program,
316 give it zero. Used for debugging signals. */
317 else if (stop_signal
< NSIG
&& !signal_program
[stop_signal
])
320 /* Resume inferior. */
321 resume (oneproc
|| step
|| bpstat_should_step (), stop_signal
);
323 /* Wait for it to stop (if not standalone)
324 and in any case decode why it stopped, and act accordingly. */
326 wait_for_inferior ();
330 /* Record the pc and sp of the program the last time it stopped.
331 These are just used internally by wait_for_inferior, but need
332 to be preserved over calls to it and cleared when the inferior
334 static CORE_ADDR prev_pc
;
335 static CORE_ADDR prev_sp
;
336 static CORE_ADDR prev_func_start
;
337 static char *prev_func_name
;
340 /* Start remote-debugging of a machine over a serial link. */
345 init_wait_for_inferior ();
346 clear_proceed_status ();
347 stop_soon_quietly
= 1;
349 wait_for_inferior ();
353 /* Initialize static vars when a new inferior begins. */
356 init_wait_for_inferior ()
358 /* These are meaningless until the first time through wait_for_inferior. */
362 prev_func_name
= NULL
;
364 trap_expected_after_continue
= 0;
365 breakpoints_inserted
= 0;
366 breakpoint_init_inferior ();
367 stop_signal
= 0; /* Don't confuse first call to proceed(). */
371 delete_breakpoint_current_contents (arg
)
374 struct breakpoint
**breakpointp
= (struct breakpoint
**)arg
;
375 if (*breakpointp
!= NULL
)
376 delete_breakpoint (*breakpointp
);
379 /* Wait for control to return from inferior to debugger.
380 If inferior gets a signal, we may decide to start it up again
381 instead of returning. That is why there is a loop in this function.
382 When this function actually returns it means the inferior
383 should be left stopped and GDB should read more commands. */
388 struct cleanup
*old_cleanups
;
392 CORE_ADDR stop_sp
= 0;
393 CORE_ADDR stop_func_start
;
394 CORE_ADDR stop_func_end
;
395 char *stop_func_name
;
396 CORE_ADDR prologue_pc
= 0, tmp
;
397 struct symtab_and_line sal
;
398 int remove_breakpoints_on_following_step
= 0;
400 int handling_longjmp
= 0; /* FIXME */
401 struct breakpoint
*step_resume_breakpoint
= NULL
;
404 old_cleanups
= make_cleanup (delete_breakpoint_current_contents
,
405 &step_resume_breakpoint
);
406 sal
= find_pc_line(prev_pc
, 0);
407 current_line
= sal
.line
;
409 /* Are we stepping? */
410 #define CURRENTLY_STEPPING() ((step_resume_breakpoint == NULL \
411 && !handling_longjmp \
414 || bpstat_should_step ())
418 /* Clean up saved state that will become invalid. */
419 flush_cached_frames ();
420 registers_changed ();
422 pid
= target_wait (-1, &w
);
424 #ifdef SIGTRAP_STOP_AFTER_LOAD
426 /* Somebody called load(2), and it gave us a "trap signal after load".
427 Ignore it gracefully. */
429 SIGTRAP_STOP_AFTER_LOAD (w
);
432 /* See if the process still exists; clean up if it doesn't. */
435 target_terminal_ours (); /* Must do this before mourn anyway */
437 printf_filtered ("\nProgram exited with code 0%o.\n",
438 (unsigned int)WEXITSTATUS (w
));
441 printf_filtered ("\nProgram exited normally.\n");
443 target_mourn_inferior ();
444 #ifdef NO_SINGLE_STEP
447 stop_print_frame
= 0;
450 else if (!WIFSTOPPED (w
))
454 stop_print_frame
= 0;
455 stop_signal
= WTERMSIG (w
);
456 target_terminal_ours (); /* Must do this before mourn anyway */
457 target_kill (); /* kill mourns as well */
458 #ifdef PRINT_RANDOM_SIGNAL
459 printf_filtered ("\nProgram terminated: ");
460 PRINT_RANDOM_SIGNAL (stop_signal
);
462 printf_filtered ("\nProgram terminated with signal ");
463 signame
= strsigno (stop_signal
);
465 printf_filtered ("%d", stop_signal
);
467 /* Do we need to print the number in addition to the name? */
468 printf_filtered ("%s (%d)", signame
, stop_signal
);
469 printf_filtered (", %s\n", safe_strsignal (stop_signal
));
471 printf_filtered ("The program no longer exists.\n");
473 #ifdef NO_SINGLE_STEP
479 stop_signal
= WSTOPSIG (w
);
481 if (pid
!= inferior_pid
)
483 int save_pid
= inferior_pid
;
485 inferior_pid
= pid
; /* Setup for target memory/regs */
486 registers_changed ();
487 stop_pc
= read_pc ();
488 inferior_pid
= save_pid
;
489 registers_changed ();
492 stop_pc
= read_pc ();
494 if (stop_signal
== SIGTRAP
495 && breakpoint_here_p (stop_pc
- DECR_PC_AFTER_BREAK
))
496 if (!breakpoint_thread_match (stop_pc
- DECR_PC_AFTER_BREAK
, pid
))
498 /* Saw a breakpoint, but it was hit by the wrong thread. Just continue. */
499 if (breakpoints_inserted
)
501 remove_breakpoints ();
502 target_resume (pid
, 1, 0); /* Single step */
503 /* FIXME: What if a signal arrives instead of the single-step
505 target_wait (pid
, NULL
);
506 insert_breakpoints ();
508 target_resume (-1, 0, 0);
512 if (pid
!= inferior_pid
)
515 if (pid
!= inferior_pid
)
519 if (!in_thread_list (pid
))
521 fprintf (stderr
, "[New %s]\n", target_pid_to_str (pid
));
524 target_resume (-1, 0, 0);
529 if (stop_signal
>= NSIG
|| signal_print
[stop_signal
])
534 target_terminal_ours_for_output ();
535 printf_filtered ("\nProgram received signal ");
536 signame
= strsigno (stop_signal
);
538 printf_filtered ("%d", stop_signal
);
540 printf_filtered ("%s (%d)", signame
, stop_signal
);
541 printf_filtered (", %s\n", safe_strsignal (stop_signal
));
546 if (stop_signal
== SIGTRAP
547 || stop_signal
>= NSIG
548 || signal_stop
[stop_signal
])
552 printf_filtered ("[Switching to %s]\n", target_pid_to_str (pid
));
554 flush_cached_frames ();
555 registers_changed ();
557 if (step_resume_breakpoint
)
559 delete_breakpoint (step_resume_breakpoint
);
560 step_resume_breakpoint
= NULL
;
564 prev_func_name
= NULL
;
565 step_range_start
= 0;
567 step_frame_address
= 0;
568 handling_longjmp
= 0;
574 target_terminal_inferior ();
576 /* Clear the signal if it should not be passed. */
577 if (signal_program
[stop_signal
] == 0)
580 target_resume (-1, 0, stop_signal
);
588 #ifdef NO_SINGLE_STEP
590 single_step (0); /* This actually cleans up the ss */
591 #endif /* NO_SINGLE_STEP */
593 /* If PC is pointing at a nullified instruction, then step beyond it so that
594 the user won't be confused when GDB appears to be ready to execute it. */
596 if (INSTRUCTION_NULLIFIED
)
602 set_current_frame ( create_new_frame (read_fp (), stop_pc
));
604 stop_frame_address
= FRAME_FP (get_current_frame ());
605 stop_sp
= read_sp ();
609 /* Don't care about return value; stop_func_start and stop_func_name
610 will both be 0 if it doesn't work. */
611 find_pc_partial_function (stop_pc
, &stop_func_name
, &stop_func_start
,
613 stop_func_start
+= FUNCTION_START_OFFSET
;
615 bpstat_clear (&stop_bpstat
);
617 stop_stack_dummy
= 0;
618 stop_print_frame
= 1;
620 stopped_by_random_signal
= 0;
621 breakpoints_failed
= 0;
623 /* Look at the cause of the stop, and decide what to do.
624 The alternatives are:
625 1) break; to really stop and return to the debugger,
626 2) drop through to start up again
627 (set another_trap to 1 to single step once)
628 3) set random_signal to 1, and the decision between 1 and 2
629 will be made according to the signal handling tables. */
631 /* First, distinguish signals caused by the debugger from signals
632 that have to do with the program's own actions.
633 Note that breakpoint insns may cause SIGTRAP or SIGILL
634 or SIGEMT, depending on the operating system version.
635 Here we detect when a SIGILL or SIGEMT is really a breakpoint
636 and change it to SIGTRAP. */
638 if (stop_signal
== SIGTRAP
639 || (breakpoints_inserted
&&
640 (stop_signal
== SIGILL
642 || stop_signal
== SIGEMT
645 || stop_soon_quietly
)
647 if (stop_signal
== SIGTRAP
&& stop_after_trap
)
649 stop_print_frame
= 0;
652 if (stop_soon_quietly
)
655 /* Don't even think about breakpoints
656 if just proceeded over a breakpoint.
658 However, if we are trying to proceed over a breakpoint
659 and end up in sigtramp, then step_resume_breakpoint
660 will be set and we should check whether we've hit the
662 if (stop_signal
== SIGTRAP
&& trap_expected
663 && step_resume_breakpoint
== NULL
)
664 bpstat_clear (&stop_bpstat
);
667 /* See if there is a breakpoint at the current PC. */
668 stop_bpstat
= bpstat_stop_status
669 (&stop_pc
, stop_frame_address
,
670 #if DECR_PC_AFTER_BREAK
671 /* Notice the case of stepping through a jump
672 that lands just after a breakpoint.
673 Don't confuse that with hitting the breakpoint.
674 What we check for is that 1) stepping is going on
675 and 2) the pc before the last insn does not match
676 the address of the breakpoint before the current pc. */
677 (prev_pc
!= stop_pc
- DECR_PC_AFTER_BREAK
678 && CURRENTLY_STEPPING ())
679 #else /* DECR_PC_AFTER_BREAK zero */
681 #endif /* DECR_PC_AFTER_BREAK zero */
683 /* Following in case break condition called a
685 stop_print_frame
= 1;
688 if (stop_signal
== SIGTRAP
)
690 = !(bpstat_explains_signal (stop_bpstat
)
692 #ifndef CALL_DUMMY_BREAKPOINT_OFFSET
693 || PC_IN_CALL_DUMMY (stop_pc
, stop_sp
, stop_frame_address
)
694 #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */
695 || (step_range_end
&& step_resume_breakpoint
== NULL
));
699 = !(bpstat_explains_signal (stop_bpstat
)
700 /* End of a stack dummy. Some systems (e.g. Sony
701 news) give another signal besides SIGTRAP,
702 so check here as well as above. */
703 #ifndef CALL_DUMMY_BREAKPOINT_OFFSET
704 || PC_IN_CALL_DUMMY (stop_pc
, stop_sp
, stop_frame_address
)
705 #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */
708 stop_signal
= SIGTRAP
;
714 /* For the program's own signals, act according to
715 the signal handling tables. */
719 /* Signal not for debugging purposes. */
722 stopped_by_random_signal
= 1;
724 if (stop_signal
>= NSIG
725 || signal_print
[stop_signal
])
729 target_terminal_ours_for_output ();
730 #ifdef PRINT_RANDOM_SIGNAL
731 PRINT_RANDOM_SIGNAL (stop_signal
);
733 printf_filtered ("\nProgram received signal ");
734 signame
= strsigno (stop_signal
);
736 printf_filtered ("%d", stop_signal
);
738 /* Do we need to print the number as well as the name? */
739 printf_filtered ("%s (%d)", signame
, stop_signal
);
740 printf_filtered (", %s\n", safe_strsignal (stop_signal
));
741 #endif /* PRINT_RANDOM_SIGNAL */
744 if (stop_signal
>= NSIG
745 || signal_stop
[stop_signal
])
747 /* If not going to stop, give terminal back
748 if we took it away. */
750 target_terminal_inferior ();
752 /* Clear the signal if it should not be passed. */
753 if (signal_program
[stop_signal
] == 0)
756 /* I'm not sure whether this needs to be check_sigtramp2 or
757 whether it could/should be keep_going. */
758 goto check_sigtramp2
;
761 /* Handle cases caused by hitting a breakpoint. */
763 CORE_ADDR jmp_buf_pc
;
764 struct bpstat_what what
;
766 what
= bpstat_what (stop_bpstat
);
770 stop_stack_dummy
= 1;
772 trap_expected_after_continue
= 1;
776 switch (what
.main_action
)
778 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
779 /* If we hit the breakpoint at longjmp, disable it for the
780 duration of this command. Then, install a temporary
781 breakpoint at the target of the jmp_buf. */
782 disable_longjmp_breakpoint();
783 remove_breakpoints ();
784 breakpoints_inserted
= 0;
785 if (!GET_LONGJMP_TARGET(&jmp_buf_pc
)) goto keep_going
;
787 /* Need to blow away step-resume breakpoint, as it
788 interferes with us */
789 if (step_resume_breakpoint
!= NULL
)
791 delete_breakpoint (step_resume_breakpoint
);
792 step_resume_breakpoint
= NULL
;
793 what
.step_resume
= 0;
797 /* FIXME - Need to implement nested temporary breakpoints */
798 if (step_over_calls
> 0)
799 set_longjmp_resume_breakpoint(jmp_buf_pc
,
800 get_current_frame());
803 set_longjmp_resume_breakpoint(jmp_buf_pc
, NULL
);
804 handling_longjmp
= 1; /* FIXME */
807 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
808 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE
:
809 remove_breakpoints ();
810 breakpoints_inserted
= 0;
812 /* FIXME - Need to implement nested temporary breakpoints */
814 && (stop_frame_address
815 INNER_THAN step_frame_address
))
821 disable_longjmp_breakpoint();
822 handling_longjmp
= 0; /* FIXME */
823 if (what
.main_action
== BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
)
825 /* else fallthrough */
827 case BPSTAT_WHAT_SINGLE
:
828 if (breakpoints_inserted
)
829 remove_breakpoints ();
830 breakpoints_inserted
= 0;
832 /* Still need to check other stuff, at least the case
833 where we are stepping and step out of the right range. */
836 case BPSTAT_WHAT_STOP_NOISY
:
837 stop_print_frame
= 1;
838 /* We are about to nuke the step_resume_breakpoint via the
839 cleanup chain, so no need to worry about it here. */
842 case BPSTAT_WHAT_STOP_SILENT
:
843 stop_print_frame
= 0;
844 /* We are about to nuke the step_resume_breakpoint via the
845 cleanup chain, so no need to worry about it here. */
848 case BPSTAT_WHAT_KEEP_CHECKING
:
852 if (what
.step_resume
)
854 delete_breakpoint (step_resume_breakpoint
);
855 step_resume_breakpoint
= NULL
;
857 /* If were waiting for a trap, hitting the step_resume_break
858 doesn't count as getting it. */
864 /* We come here if we hit a breakpoint but should not
865 stop for it. Possibly we also were stepping
866 and should stop for that. So fall through and
867 test for stepping. But, if not stepping,
870 #ifndef CALL_DUMMY_BREAKPOINT_OFFSET
871 /* This is the old way of detecting the end of the stack dummy.
872 An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets
873 handled above. As soon as we can test it on all of them, all
874 architectures should define it. */
876 /* If this is the breakpoint at the end of a stack dummy,
877 just stop silently, unless the user was doing an si/ni, in which
878 case she'd better know what she's doing. */
880 if (PC_IN_CALL_DUMMY (stop_pc
, stop_sp
, stop_frame_address
)
883 stop_print_frame
= 0;
884 stop_stack_dummy
= 1;
886 trap_expected_after_continue
= 1;
890 #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */
892 if (step_resume_breakpoint
)
893 /* Having a step-resume breakpoint overrides anything
894 else having to do with stepping commands until
895 that breakpoint is reached. */
896 /* I suspect this could/should be keep_going, because if the
897 check_sigtramp2 check succeeds, then it will put in another
898 step_resume_breakpoint, and we aren't (yet) prepared to nest
900 goto check_sigtramp2
;
902 if (step_range_end
== 0)
903 /* Likewise if we aren't even stepping. */
904 /* I'm not sure whether this needs to be check_sigtramp2 or
905 whether it could/should be keep_going. */
906 goto check_sigtramp2
;
908 /* If stepping through a line, keep going if still within it. */
909 if (stop_pc
>= step_range_start
910 && stop_pc
< step_range_end
911 /* The step range might include the start of the
912 function, so if we are at the start of the
913 step range and either the stack or frame pointers
914 just changed, we've stepped outside */
915 && !(stop_pc
== step_range_start
916 && stop_frame_address
917 && (stop_sp INNER_THAN prev_sp
918 || stop_frame_address
!= step_frame_address
)))
920 /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal.
921 So definately need to check for sigtramp here. */
922 goto check_sigtramp2
;
925 /* We stepped out of the stepping range. See if that was due
926 to a subroutine call that we should proceed to the end of. */
928 /* Did we just take a signal? */
929 if (IN_SIGTRAMP (stop_pc
, stop_func_name
)
930 && !IN_SIGTRAMP (prev_pc
, prev_func_name
))
932 /* This code is needed at least in the following case:
933 The user types "next" and then a signal arrives (before
934 the "next" is done). */
935 /* We've just taken a signal; go until we are back to
936 the point where we took it and one more. */
938 struct symtab_and_line sr_sal
;
941 sr_sal
.symtab
= NULL
;
943 step_resume_breakpoint
=
944 set_momentary_breakpoint (sr_sal
, get_current_frame (),
946 if (breakpoints_inserted
)
947 insert_breakpoints ();
950 /* If this is stepi or nexti, make sure that the stepping range
951 gets us past that instruction. */
952 if (step_range_end
== 1)
953 /* FIXME: Does this run afoul of the code below which, if
954 we step into the middle of a line, resets the stepping
956 step_range_end
= (step_range_start
= prev_pc
) + 1;
958 remove_breakpoints_on_following_step
= 1;
964 /* Do this after the IN_SIGTRAMP check; it might give
966 prologue_pc
= stop_func_start
;
967 SKIP_PROLOGUE (prologue_pc
);
970 if ((/* Might be a non-recursive call. If the symbols are missing
971 enough that stop_func_start == prev_func_start even though
972 they are really two functions, we will treat some calls as
974 stop_func_start
!= prev_func_start
976 /* Might be a recursive call if either we have a prologue
977 or the call instruction itself saves the PC on the stack. */
978 || prologue_pc
!= stop_func_start
979 || stop_sp
!= prev_sp
)
980 && (/* I think this can only happen if stop_func_start is zero
981 (e.g. stop_pc is in some objfile we don't know about).
982 If the stop_pc does that (ends up someplace unknown), it
983 must be some sort of subroutine call. */
984 stop_pc
< stop_func_start
985 || stop_pc
>= stop_func_end
987 /* If we do a call, we will be at the start of a function. */
988 || stop_pc
== stop_func_start
991 /* Not conservative enough for 4.11. FIXME: enable this
993 /* Except on the Alpha with -O (and perhaps other machines
994 with similar calling conventions), in which we might
995 call the address after the load of gp. Since prologues
996 don't contain calls, we can't return to within one, and
997 we don't jump back into them, so this check is OK. */
998 || stop_pc
< prologue_pc
1001 /* If we end up in certain places, it means we did a subroutine
1002 call. I'm not completely sure this is necessary now that we
1003 have the above checks with stop_func_start (and now that
1004 find_pc_partial_function is pickier. */
1005 || IN_SOLIB_TRAMPOLINE (stop_pc
, stop_func_name
)
1007 /* If none of the above apply, it is a jump within a function,
1008 or a return from a subroutine. The other case is longjmp,
1009 which can no longer happen here as long as the
1010 handling_longjmp stuff is working. */
1013 /* It's a subroutine call. */
1015 if (step_over_calls
== 0)
1017 /* I presume that step_over_calls is only 0 when we're
1018 supposed to be stepping at the assembly language level
1019 ("stepi"). Just stop. */
1024 if (step_over_calls
> 0)
1025 /* We're doing a "next". */
1026 goto step_over_function
;
1028 /* If we are in a function call trampoline (a stub between
1029 the calling routine and the real function), locate the real
1030 function. That's what tells us (a) whether we want to step
1031 into it at all, and (b) what prologue we want to run to
1032 the end of, if we do step into it. */
1033 tmp
= SKIP_TRAMPOLINE_CODE (stop_pc
);
1035 stop_func_start
= tmp
;
1037 /* If we have line number information for the function we
1038 are thinking of stepping into, step into it.
1040 If there are several symtabs at that PC (e.g. with include
1041 files), just want to know whether *any* of them have line
1042 numbers. find_pc_line handles this. */
1044 struct symtab_and_line tmp_sal
;
1046 tmp_sal
= find_pc_line (stop_func_start
, 0);
1047 if (tmp_sal
.line
!= 0)
1048 goto step_into_function
;
1052 /* A subroutine call has happened. */
1054 /* Set a special breakpoint after the return */
1055 struct symtab_and_line sr_sal
;
1058 (SAVED_PC_AFTER_CALL (get_current_frame ()));
1059 sr_sal
.symtab
= NULL
;
1061 step_resume_breakpoint
=
1062 set_momentary_breakpoint (sr_sal
, get_current_frame (),
1064 if (breakpoints_inserted
)
1065 insert_breakpoints ();
1070 /* Subroutine call with source code we should not step over.
1071 Do step to the first line of code in it. */
1072 SKIP_PROLOGUE (stop_func_start
);
1073 sal
= find_pc_line (stop_func_start
, 0);
1074 /* Use the step_resume_break to step until
1075 the end of the prologue, even if that involves jumps
1076 (as it seems to on the vax under 4.2). */
1077 /* If the prologue ends in the middle of a source line,
1078 continue to the end of that source line.
1079 Otherwise, just go to end of prologue. */
1080 #ifdef PROLOGUE_FIRSTLINE_OVERLAP
1081 /* no, don't either. It skips any code that's
1082 legitimately on the first line. */
1084 if (sal
.end
&& sal
.pc
!= stop_func_start
)
1085 stop_func_start
= sal
.end
;
1088 if (stop_func_start
== stop_pc
)
1090 /* We are already there: stop now. */
1095 /* Put the step-breakpoint there and go until there. */
1097 struct symtab_and_line sr_sal
;
1099 sr_sal
.pc
= stop_func_start
;
1100 sr_sal
.symtab
= NULL
;
1102 /* Do not specify what the fp should be when we stop
1103 since on some machines the prologue
1104 is where the new fp value is established. */
1105 step_resume_breakpoint
=
1106 set_momentary_breakpoint (sr_sal
, NULL
, bp_step_resume
);
1107 if (breakpoints_inserted
)
1108 insert_breakpoints ();
1110 /* And make sure stepping stops right away then. */
1111 step_range_end
= step_range_start
;
1116 /* We've wandered out of the step range (but haven't done a
1117 subroutine call or return). (Is that true? I think we get
1118 here if we did a return and maybe a longjmp). */
1120 sal
= find_pc_line(stop_pc
, 0);
1122 if (step_range_end
== 1)
1124 /* It is stepi or nexti. We always want to stop stepping after
1132 /* We have no line number information. That means to stop
1133 stepping (does this always happen right after one instruction,
1134 when we do "s" in a function with no line numbers,
1135 or can this happen as a result of a return or longjmp?). */
1140 if (stop_pc
== sal
.pc
&& current_line
!= sal
.line
)
1142 /* We are at the start of a different line. So stop. Note that
1143 we don't stop if we step into the middle of a different line.
1144 That is said to make things like for (;;) statements work
1150 /* We aren't done stepping.
1152 Optimize by setting the stepping range to the line.
1153 (We might not be in the original line, but if we entered a
1154 new line in mid-statement, we continue stepping. This makes
1155 things like for(;;) statements work better.) */
1156 step_range_start
= sal
.pc
;
1157 step_range_end
= sal
.end
;
1162 && IN_SIGTRAMP (stop_pc
, stop_func_name
)
1163 && !IN_SIGTRAMP (prev_pc
, prev_func_name
))
1165 /* What has happened here is that we have just stepped the inferior
1166 with a signal (because it is a signal which shouldn't make
1167 us stop), thus stepping into sigtramp.
1169 So we need to set a step_resume_break_address breakpoint
1170 and continue until we hit it, and then step. FIXME: This should
1171 be more enduring than a step_resume breakpoint; we should know
1172 that we will later need to keep going rather than re-hitting
1173 the breakpoint here (see testsuite/gdb.t06/signals.exp where
1174 it says "exceedingly difficult"). */
1175 struct symtab_and_line sr_sal
;
1177 sr_sal
.pc
= prev_pc
;
1178 sr_sal
.symtab
= NULL
;
1180 step_resume_breakpoint
=
1181 set_momentary_breakpoint (sr_sal
, get_current_frame (),
1183 if (breakpoints_inserted
)
1184 insert_breakpoints ();
1186 remove_breakpoints_on_following_step
= 1;
1191 /* Come to this label when you need to resume the inferior.
1192 It's really much cleaner to do a goto than a maze of if-else
1195 /* Save the pc before execution, to compare with pc after stop. */
1196 prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
1197 prev_func_start
= stop_func_start
; /* Ok, since if DECR_PC_AFTER
1198 BREAK is defined, the
1199 original pc would not have
1200 been at the start of a
1202 prev_func_name
= stop_func_name
;
1205 /* If we did not do break;, it means we should keep
1206 running the inferior and not return to debugger. */
1208 if (trap_expected
&& stop_signal
!= SIGTRAP
)
1210 /* We took a signal (which we are supposed to pass through to
1211 the inferior, else we'd have done a break above) and we
1212 haven't yet gotten our trap. Simply continue. */
1213 resume (CURRENTLY_STEPPING (), stop_signal
);
1217 /* Either the trap was not expected, but we are continuing
1218 anyway (the user asked that this signal be passed to the
1221 The signal was SIGTRAP, e.g. it was our signal, but we
1222 decided we should resume from it.
1224 We're going to run this baby now!
1226 Insert breakpoints now, unless we are trying
1227 to one-proceed past a breakpoint. */
1228 /* If we've just finished a special step resume and we don't
1229 want to hit a breakpoint, pull em out. */
1230 if (step_resume_breakpoint
== NULL
&&
1231 remove_breakpoints_on_following_step
)
1233 remove_breakpoints_on_following_step
= 0;
1234 remove_breakpoints ();
1235 breakpoints_inserted
= 0;
1237 else if (!breakpoints_inserted
&&
1238 (step_resume_breakpoint
!= NULL
|| !another_trap
))
1240 breakpoints_failed
= insert_breakpoints ();
1241 if (breakpoints_failed
)
1243 breakpoints_inserted
= 1;
1246 trap_expected
= another_trap
;
1248 if (stop_signal
== SIGTRAP
)
1251 #ifdef SHIFT_INST_REGS
1252 /* I'm not sure when this following segment applies. I do know, now,
1253 that we shouldn't rewrite the regs when we were stopped by a
1254 random signal from the inferior process. */
1255 /* FIXME: Shouldn't this be based on the valid bit of the SXIP?
1256 (this is only used on the 88k). */
1258 if (!bpstat_explains_signal (stop_bpstat
)
1259 && (stop_signal
!= SIGCLD
)
1260 && !stopped_by_random_signal
)
1262 #endif /* SHIFT_INST_REGS */
1264 resume (CURRENTLY_STEPPING (), stop_signal
);
1269 if (target_has_execution
)
1271 /* Assuming the inferior still exists, set these up for next
1272 time, just like we did above if we didn't break out of the
1274 prev_pc
= read_pc ();
1275 prev_func_start
= stop_func_start
;
1276 prev_func_name
= stop_func_name
;
1279 do_cleanups (old_cleanups
);
1282 /* Here to return control to GDB when the inferior stops for real.
1283 Print appropriate messages, remove breakpoints, give terminal our modes.
1285 STOP_PRINT_FRAME nonzero means print the executing frame
1286 (pc, function, args, file, line number and line text).
1287 BREAKPOINTS_FAILED nonzero means stop was due to error
1288 attempting to insert breakpoints. */
1293 /* Make sure that the current_frame's pc is correct. This
1294 is a correction for setting up the frame info before doing
1295 DECR_PC_AFTER_BREAK */
1296 if (target_has_execution
&& get_current_frame())
1297 (get_current_frame ())->pc
= read_pc ();
1299 if (breakpoints_failed
)
1301 target_terminal_ours_for_output ();
1302 print_sys_errmsg ("ptrace", breakpoints_failed
);
1303 printf_filtered ("Stopped; cannot insert breakpoints.\n\
1304 The same program may be running in another process.\n");
1307 if (target_has_execution
&& breakpoints_inserted
)
1308 if (remove_breakpoints ())
1310 target_terminal_ours_for_output ();
1311 printf_filtered ("Cannot remove breakpoints because program is no longer writable.\n\
1312 It might be running in another process.\n\
1313 Further execution is probably impossible.\n");
1316 breakpoints_inserted
= 0;
1318 /* Delete the breakpoint we stopped at, if it wants to be deleted.
1319 Delete any breakpoint that is to be deleted at the next stop. */
1321 breakpoint_auto_delete (stop_bpstat
);
1323 /* If an auto-display called a function and that got a signal,
1324 delete that auto-display to avoid an infinite recursion. */
1326 if (stopped_by_random_signal
)
1327 disable_current_display ();
1329 if (step_multi
&& stop_step
)
1332 target_terminal_ours ();
1334 /* Look up the hook_stop and run it if it exists. */
1336 if (stop_command
->hook
)
1338 catch_errors (hook_stop_stub
, (char *)stop_command
->hook
,
1339 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
1342 if (!target_has_stack
)
1345 /* Select innermost stack frame except on return from a stack dummy routine,
1346 or if the program has exited. Print it without a level number if
1347 we have changed functions or hit a breakpoint. Print source line
1349 if (!stop_stack_dummy
)
1351 select_frame (get_current_frame (), 0);
1353 if (stop_print_frame
)
1357 source_only
= bpstat_print (stop_bpstat
);
1358 source_only
= source_only
||
1360 && step_frame_address
== stop_frame_address
1361 && step_start_function
== find_pc_function (stop_pc
));
1363 print_stack_frame (selected_frame
, -1, source_only
? -1: 1);
1365 /* Display the auto-display expressions. */
1370 /* Save the function value return registers, if we care.
1371 We might be about to restore their previous contents. */
1372 if (proceed_to_finish
)
1373 read_register_bytes (0, stop_registers
, REGISTER_BYTES
);
1375 if (stop_stack_dummy
)
1377 /* Pop the empty frame that contains the stack dummy.
1378 POP_FRAME ends with a setting of the current frame, so we
1379 can use that next. */
1381 select_frame (get_current_frame (), 0);
1386 hook_stop_stub (cmd
)
1389 execute_user_command ((struct cmd_list_element
*)cmd
, 0);
1393 int signal_stop_state (signo
)
1396 return ((signo
>= 0 && signo
< NSIG
) ? signal_stop
[signo
] : 0);
1399 int signal_print_state (signo
)
1402 return ((signo
>= 0 && signo
< NSIG
) ? signal_print
[signo
] : 0);
1405 int signal_pass_state (signo
)
1408 return ((signo
>= 0 && signo
< NSIG
) ? signal_program
[signo
] : 0);
1414 printf_filtered ("Signal\t\tStop\tPrint\tPass to program\tDescription\n");
1418 sig_print_info (number
)
1423 if ((name
= strsigno (number
)) == NULL
)
1424 printf_filtered ("%d\t\t", number
);
1426 printf_filtered ("%s (%d)\t", name
, number
);
1427 printf_filtered ("%s\t", signal_stop
[number
] ? "Yes" : "No");
1428 printf_filtered ("%s\t", signal_print
[number
] ? "Yes" : "No");
1429 printf_filtered ("%s\t\t", signal_program
[number
] ? "Yes" : "No");
1430 printf_filtered ("%s\n", safe_strsignal (number
));
1433 /* Specify how various signals in the inferior should be handled. */
1436 handle_command (args
, from_tty
)
1441 int digits
, wordlen
;
1442 int sigfirst
, signum
, siglast
;
1445 unsigned char *sigs
;
1446 struct cleanup
*old_chain
;
1450 error_no_arg ("signal to handle");
1453 /* Allocate and zero an array of flags for which signals to handle. */
1455 nsigs
= signo_max () + 1;
1456 sigs
= (unsigned char *) alloca (nsigs
);
1457 memset (sigs
, 0, nsigs
);
1459 /* Break the command line up into args. */
1461 argv
= buildargv (args
);
1466 old_chain
= make_cleanup (freeargv
, (char *) argv
);
1468 /* Walk through the args, looking for signal numbers, signal names, and
1469 actions. Signal numbers and signal names may be interspersed with
1470 actions, with the actions being performed for all signals cumulatively
1471 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
1473 while (*argv
!= NULL
)
1475 wordlen
= strlen (*argv
);
1476 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++) {;}
1478 sigfirst
= siglast
= -1;
1480 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
1482 /* Apply action to all signals except those used by the
1483 debugger. Silently skip those. */
1486 siglast
= nsigs
- 1;
1488 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
1490 SET_SIGS (nsigs
, sigs
, signal_stop
);
1491 SET_SIGS (nsigs
, sigs
, signal_print
);
1493 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
1495 UNSET_SIGS (nsigs
, sigs
, signal_program
);
1497 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
1499 SET_SIGS (nsigs
, sigs
, signal_print
);
1501 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
1503 SET_SIGS (nsigs
, sigs
, signal_program
);
1505 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
1507 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
1509 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
1511 SET_SIGS (nsigs
, sigs
, signal_program
);
1513 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
1515 UNSET_SIGS (nsigs
, sigs
, signal_print
);
1516 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
1518 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
1520 UNSET_SIGS (nsigs
, sigs
, signal_program
);
1522 else if (digits
> 0)
1524 sigfirst
= siglast
= atoi (*argv
);
1525 if ((*argv
)[digits
] == '-')
1527 siglast
= atoi ((*argv
) + digits
+ 1);
1529 if (sigfirst
> siglast
)
1531 /* Bet he didn't figure we'd think of this case... */
1536 if (sigfirst
< 0 || sigfirst
>= nsigs
)
1538 error ("Signal %d not in range 0-%d", sigfirst
, nsigs
- 1);
1540 if (siglast
< 0 || siglast
>= nsigs
)
1542 error ("Signal %d not in range 0-%d", siglast
, nsigs
- 1);
1545 else if ((signum
= strtosigno (*argv
)) != 0)
1547 sigfirst
= siglast
= signum
;
1551 /* Not a number and not a recognized flag word => complain. */
1552 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv
);
1555 /* If any signal numbers or symbol names were found, set flags for
1556 which signals to apply actions to. */
1558 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
1564 if (!allsigs
&& !sigs
[signum
])
1566 if (query ("%s is used by the debugger.\nAre you sure you want to change it? ", strsigno (signum
)))
1572 printf ("Not confirmed, unchanged.\n");
1586 target_notice_signals(inferior_pid
);
1590 /* Show the results. */
1591 sig_print_header ();
1592 for (signum
= 0; signum
< nsigs
; signum
++)
1596 sig_print_info (signum
);
1601 do_cleanups (old_chain
);
1604 /* Print current contents of the tables set by the handle command. */
1607 signals_info (signum_exp
, from_tty
)
1612 sig_print_header ();
1616 /* First see if this is a symbol name. */
1617 i
= strtosigno (signum_exp
);
1620 /* Nope, maybe it's an address which evaluates to a signal
1622 i
= parse_and_eval_address (signum_exp
);
1623 if (i
>= NSIG
|| i
< 0)
1624 error ("Signal number out of bounds.");
1630 printf_filtered ("\n");
1631 for (i
= 0; i
< NSIG
; i
++)
1638 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
1641 /* Save all of the information associated with the inferior<==>gdb
1642 connection. INF_STATUS is a pointer to a "struct inferior_status"
1643 (defined in inferior.h). */
1646 save_inferior_status (inf_status
, restore_stack_info
)
1647 struct inferior_status
*inf_status
;
1648 int restore_stack_info
;
1650 inf_status
->stop_signal
= stop_signal
;
1651 inf_status
->stop_pc
= stop_pc
;
1652 inf_status
->stop_frame_address
= stop_frame_address
;
1653 inf_status
->stop_step
= stop_step
;
1654 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
1655 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
1656 inf_status
->trap_expected
= trap_expected
;
1657 inf_status
->step_range_start
= step_range_start
;
1658 inf_status
->step_range_end
= step_range_end
;
1659 inf_status
->step_frame_address
= step_frame_address
;
1660 inf_status
->step_over_calls
= step_over_calls
;
1661 inf_status
->stop_after_trap
= stop_after_trap
;
1662 inf_status
->stop_soon_quietly
= stop_soon_quietly
;
1663 /* Save original bpstat chain here; replace it with copy of chain.
1664 If caller's caller is walking the chain, they'll be happier if we
1665 hand them back the original chain when restore_i_s is called. */
1666 inf_status
->stop_bpstat
= stop_bpstat
;
1667 stop_bpstat
= bpstat_copy (stop_bpstat
);
1668 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
1669 inf_status
->restore_stack_info
= restore_stack_info
;
1670 inf_status
->proceed_to_finish
= proceed_to_finish
;
1672 memcpy (inf_status
->stop_registers
, stop_registers
, REGISTER_BYTES
);
1674 read_register_bytes (0, inf_status
->registers
, REGISTER_BYTES
);
1676 record_selected_frame (&(inf_status
->selected_frame_address
),
1677 &(inf_status
->selected_level
));
1681 struct restore_selected_frame_args
{
1682 FRAME_ADDR frame_address
;
1686 static int restore_selected_frame
PARAMS ((char *));
1688 /* Restore the selected frame. args is really a struct
1689 restore_selected_frame_args * (declared as char * for catch_errors)
1690 telling us what frame to restore. Returns 1 for success, or 0 for
1691 failure. An error message will have been printed on error. */
1693 restore_selected_frame (args
)
1696 struct restore_selected_frame_args
*fr
=
1697 (struct restore_selected_frame_args
*) args
;
1699 int level
= fr
->level
;
1701 fid
= find_relative_frame (get_current_frame (), &level
);
1703 /* If inf_status->selected_frame_address is NULL, there was no
1704 previously selected frame. */
1706 FRAME_FP (fid
) != fr
->frame_address
||
1709 warning ("Unable to restore previously selected frame.\n");
1712 select_frame (fid
, fr
->level
);
1717 restore_inferior_status (inf_status
)
1718 struct inferior_status
*inf_status
;
1720 stop_signal
= inf_status
->stop_signal
;
1721 stop_pc
= inf_status
->stop_pc
;
1722 stop_frame_address
= inf_status
->stop_frame_address
;
1723 stop_step
= inf_status
->stop_step
;
1724 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
1725 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
1726 trap_expected
= inf_status
->trap_expected
;
1727 step_range_start
= inf_status
->step_range_start
;
1728 step_range_end
= inf_status
->step_range_end
;
1729 step_frame_address
= inf_status
->step_frame_address
;
1730 step_over_calls
= inf_status
->step_over_calls
;
1731 stop_after_trap
= inf_status
->stop_after_trap
;
1732 stop_soon_quietly
= inf_status
->stop_soon_quietly
;
1733 bpstat_clear (&stop_bpstat
);
1734 stop_bpstat
= inf_status
->stop_bpstat
;
1735 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
1736 proceed_to_finish
= inf_status
->proceed_to_finish
;
1738 memcpy (stop_registers
, inf_status
->stop_registers
, REGISTER_BYTES
);
1740 /* The inferior can be gone if the user types "print exit(0)"
1741 (and perhaps other times). */
1742 if (target_has_execution
)
1743 write_register_bytes (0, inf_status
->registers
, REGISTER_BYTES
);
1745 /* The inferior can be gone if the user types "print exit(0)"
1746 (and perhaps other times). */
1748 /* FIXME: If we are being called after stopping in a function which
1749 is called from gdb, we should not be trying to restore the
1750 selected frame; it just prints a spurious error message (The
1751 message is useful, however, in detecting bugs in gdb (like if gdb
1752 clobbers the stack)). In fact, should we be restoring the
1753 inferior status at all in that case? . */
1755 if (target_has_stack
&& inf_status
->restore_stack_info
)
1757 struct restore_selected_frame_args fr
;
1758 fr
.level
= inf_status
->selected_level
;
1759 fr
.frame_address
= inf_status
->selected_frame_address
;
1760 /* The point of catch_errors is that if the stack is clobbered,
1761 walking the stack might encounter a garbage pointer and error()
1762 trying to dereference it. */
1763 if (catch_errors (restore_selected_frame
, &fr
,
1764 "Unable to restore previously selected frame:\n",
1765 RETURN_MASK_ERROR
) == 0)
1766 /* Error in restoring the selected frame. Select the innermost
1768 select_frame (get_current_frame (), 0);
1774 _initialize_infrun ()
1777 register int numsigs
;
1779 add_info ("signals", signals_info
,
1780 "What debugger does when program gets various signals.\n\
1781 Specify a signal number as argument to print info on that signal only.");
1782 add_info_alias ("handle", "signals", 0);
1784 add_com ("handle", class_run
, handle_command
,
1785 "Specify how to handle a signal.\n\
1786 Args are signal numbers and actions to apply to those signals.\n\
1787 Signal numbers may be numeric (ex. 11) or symbolic (ex. SIGSEGV).\n\
1788 Numeric ranges may be specified with the form LOW-HIGH (ex. 14-21).\n\
1789 The special arg \"all\" is recognized to mean all signals except those\n\
1790 used by the debugger, typically SIGTRAP and SIGINT.\n\
1791 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
1792 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
1793 Stop means reenter debugger if this signal happens (implies print).\n\
1794 Print means print a message if this signal happens.\n\
1795 Pass means let program see this signal; otherwise program doesn't know.\n\
1796 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
1797 Pass and Stop may be combined.");
1799 stop_command
= add_cmd ("stop", class_obscure
, not_just_help_class_command
,
1800 "There is no `stop' command, but you can set a hook on `stop'.\n\
1801 This allows you to set a list of commands to be run each time execution\n\
1802 of the program stops.", &cmdlist
);
1804 numsigs
= signo_max () + 1;
1805 signal_stop
= (unsigned char *)
1806 xmalloc (sizeof (signal_stop
[0]) * numsigs
);
1807 signal_print
= (unsigned char *)
1808 xmalloc (sizeof (signal_print
[0]) * numsigs
);
1809 signal_program
= (unsigned char *)
1810 xmalloc (sizeof (signal_program
[0]) * numsigs
);
1811 for (i
= 0; i
< numsigs
; i
++)
1814 signal_print
[i
] = 1;
1815 signal_program
[i
] = 1;
1818 /* Signals caused by debugger's own actions
1819 should not be given to the program afterwards. */
1820 signal_program
[SIGTRAP
] = 0;
1821 signal_program
[SIGINT
] = 0;
1823 /* Signals that are not errors should not normally enter the debugger. */
1825 signal_stop
[SIGALRM
] = 0;
1826 signal_print
[SIGALRM
] = 0;
1827 #endif /* SIGALRM */
1829 signal_stop
[SIGVTALRM
] = 0;
1830 signal_print
[SIGVTALRM
] = 0;
1831 #endif /* SIGVTALRM */
1833 signal_stop
[SIGPROF
] = 0;
1834 signal_print
[SIGPROF
] = 0;
1835 #endif /* SIGPROF */
1837 signal_stop
[SIGCHLD
] = 0;
1838 signal_print
[SIGCHLD
] = 0;
1839 #endif /* SIGCHLD */
1841 signal_stop
[SIGCLD
] = 0;
1842 signal_print
[SIGCLD
] = 0;
1845 signal_stop
[SIGIO
] = 0;
1846 signal_print
[SIGIO
] = 0;
1849 signal_stop
[SIGURG
] = 0;
1850 signal_print
[SIGURG
] = 0;