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. */
21 /* Notes on the algorithm used in wait_for_inferior to determine if we
22 just did a subroutine call when stepping. We have the following
23 information at that point:
25 Current and previous (just before this step) pc.
26 Current and previous sp.
27 Current and previous start of current function.
29 If the starts of the functions don't match, then
31 a) We did a subroutine call.
33 In this case, the pc will be at the beginning of a function.
35 b) We did a subroutine return.
41 If we did a longjump, we were doing "nexti", since a next would
42 have attempted to skip over the assembly language routine in which
43 the longjmp is coded and would have simply been the equivalent of a
44 continue. I consider this ok behaivior. We'd like one of two
45 things to happen if we are doing a nexti through the longjmp()
46 routine: 1) It behaves as a stepi, or 2) It acts like a continue as
47 above. Given that this is a special case, and that anybody who
48 thinks that the concept of sub calls is meaningful in the context
49 of a longjmp, I'll take either one. Let's see what happens.
51 Acts like a subroutine return. I can handle that with no problem
54 -->So: If the current and previous beginnings of the current
55 function don't match, *and* the pc is at the start of a function,
56 we've done a subroutine call. If the pc is not at the start of a
57 function, we *didn't* do a subroutine call.
59 -->If the beginnings of the current and previous function do match,
62 a) We just did a recursive call.
64 In this case, we would be at the very beginning of a
65 function and 1) it will have a prologue (don't jump to
66 before prologue, or 2) (we assume here that it doesn't have
67 a prologue) there will have been a change in the stack
68 pointer over the last instruction. (Ie. it's got to put
69 the saved pc somewhere. The stack is the usual place. In
70 a recursive call a register is only an option if there's a
71 prologue to do something with it. This is even true on
72 register window machines; the prologue sets up the new
73 window. It might not be true on a register window machine
74 where the call instruction moved the register window
75 itself. Hmmm. One would hope that the stack pointer would
76 also change. If it doesn't, somebody send me a note, and
77 I'll work out a more general theory.
78 bug-gdb@prep.ai.mit.edu). This is true (albeit slipperly
79 so) on all machines I'm aware of:
81 m68k: Call changes stack pointer. Regular jumps don't.
83 sparc: Recursive calls must have frames and therefor,
86 vax: All calls have frames and hence change the
89 b) We did a return from a recursive call. I don't see that we
90 have either the ability or the need to distinguish this
91 from an ordinary jump. The stack frame will be printed
92 when and if the frame pointer changes; if we are in a
93 function without a frame pointer, it's the users own
96 c) We did a jump within a function. We assume that this is
97 true if we didn't do a recursive call.
99 d) We are in no-man's land ("I see no symbols here"). We
100 don't worry about this; it will make calls look like simple
101 jumps (and the stack frames will be printed when the frame
102 pointer moves), which is a reasonably non-violent response.
110 #include "inferior.h"
111 #include "breakpoint.h"
119 /* unistd.h is needed to #define X_OK */
123 #include <sys/file.h>
126 /* Prototypes for local functions */
129 signals_info
PARAMS ((char *, int));
132 handle_command
PARAMS ((char *, int));
135 sig_print_info
PARAMS ((int));
138 sig_print_header
PARAMS ((void));
141 resume_cleanups
PARAMS ((int));
144 hook_stop_stub
PARAMS ((char *));
146 /* GET_LONGJMP_TARGET returns the PC at which longjmp() will resume the
147 program. It needs to examine the jmp_buf argument and extract the PC
148 from it. The return value is non-zero on success, zero otherwise. */
149 #ifndef GET_LONGJMP_TARGET
150 #define GET_LONGJMP_TARGET(PC_ADDR) 0
154 /* Some machines have trampoline code that sits between function callers
155 and the actual functions themselves. If this machine doesn't have
156 such things, disable their processing. */
157 #ifndef SKIP_TRAMPOLINE_CODE
158 #define SKIP_TRAMPOLINE_CODE(pc) 0
161 /* For SVR4 shared libraries, each call goes through a small piece of
162 trampoline code in the ".init" section. IN_SOLIB_TRAMPOLINE evaluates
163 to nonzero if we are current stopped in one of these. */
164 #ifndef IN_SOLIB_TRAMPOLINE
165 #define IN_SOLIB_TRAMPOLINE(pc,name) 0
168 /* On some systems, the PC may be left pointing at an instruction that won't
169 actually be executed. This is usually indicated by a bit in the PSW. If
170 we find ourselves in such a state, then we step the target beyond the
171 nullified instruction before returning control to the user so as to avoid
174 #ifndef INSTRUCTION_NULLIFIED
175 #define INSTRUCTION_NULLIFIED 0
178 /* Tables of how to react to signals; the user sets them. */
180 static unsigned char *signal_stop
;
181 static unsigned char *signal_print
;
182 static unsigned char *signal_program
;
184 #define SET_SIGS(nsigs,sigs,flags) \
186 int signum = (nsigs); \
187 while (signum-- > 0) \
188 if ((sigs)[signum]) \
189 (flags)[signum] = 1; \
192 #define UNSET_SIGS(nsigs,sigs,flags) \
194 int signum = (nsigs); \
195 while (signum-- > 0) \
196 if ((sigs)[signum]) \
197 (flags)[signum] = 0; \
201 /* Command list pointer for the "stop" placeholder. */
203 static struct cmd_list_element
*stop_command
;
205 /* Nonzero if breakpoints are now inserted in the inferior. */
207 static int breakpoints_inserted
;
209 /* Function inferior was in as of last step command. */
211 static struct symbol
*step_start_function
;
213 /* Nonzero if we are expecting a trace trap and should proceed from it. */
215 static int trap_expected
;
217 /* Nonzero if the next time we try to continue the inferior, it will
218 step one instruction and generate a spurious trace trap.
219 This is used to compensate for a bug in HP-UX. */
221 static int trap_expected_after_continue
;
223 /* Nonzero means expecting a trace trap
224 and should stop the inferior and return silently when it happens. */
228 /* Nonzero means expecting a trap and caller will handle it themselves.
229 It is used after attach, due to attaching to a process;
230 when running in the shell before the child program has been exec'd;
231 and when running some kinds of remote stuff (FIXME?). */
233 int stop_soon_quietly
;
235 /* Nonzero if pc has been changed by the debugger
236 since the inferior stopped. */
240 /* Nonzero if proceed is being used for a "finish" command or a similar
241 situation when stop_registers should be saved. */
243 int proceed_to_finish
;
245 /* Save register contents here when about to pop a stack dummy frame,
246 if-and-only-if proceed_to_finish is set.
247 Thus this contains the return value from the called function (assuming
248 values are returned in a register). */
250 char stop_registers
[REGISTER_BYTES
];
252 /* Nonzero if program stopped due to error trying to insert breakpoints. */
254 static int breakpoints_failed
;
256 /* Nonzero after stop if current stack frame should be printed. */
258 static int stop_print_frame
;
260 #ifdef NO_SINGLE_STEP
261 extern int one_stepped
; /* From machine dependent code */
262 extern void single_step (); /* Same. */
263 #endif /* NO_SINGLE_STEP */
266 /* Things to clean up if we QUIT out of resume (). */
269 resume_cleanups (arg
)
275 /* Resume the inferior, but allow a QUIT. This is useful if the user
276 wants to interrupt some lengthy single-stepping operation
277 (for child processes, the SIGINT goes to the inferior, and so
278 we get a SIGINT random_signal, but for remote debugging and perhaps
279 other targets, that's not true).
281 STEP nonzero if we should step (zero to continue instead).
282 SIG is the signal to give the inferior (zero for none). */
288 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
291 #ifdef NO_SINGLE_STEP
293 single_step(sig
); /* Do it the hard way, w/temp breakpoints */
294 step
= 0; /* ...and don't ask hardware to do it. */
298 /* Handle any optimized stores to the inferior NOW... */
299 #ifdef DO_DEFERRED_STORES
303 target_resume (step
, sig
);
304 discard_cleanups (old_cleanups
);
308 /* Clear out all variables saying what to do when inferior is continued.
309 First do this, then set the ones you want, then call `proceed'. */
312 clear_proceed_status ()
315 step_range_start
= 0;
317 step_frame_address
= 0;
318 step_over_calls
= -1;
320 stop_soon_quietly
= 0;
321 proceed_to_finish
= 0;
322 breakpoint_proceeded
= 1; /* We're about to proceed... */
324 /* Discard any remaining commands or status from previous stop. */
325 bpstat_clear (&stop_bpstat
);
328 /* Basic routine for continuing the program in various fashions.
330 ADDR is the address to resume at, or -1 for resume where stopped.
331 SIGGNAL is the signal to give it, or 0 for none,
332 or -1 for act according to how it stopped.
333 STEP is nonzero if should trap after one instruction.
334 -1 means return after that and print nothing.
335 You should probably set various step_... variables
336 before calling here, if you are stepping.
338 You should call clear_proceed_status before calling proceed. */
341 proceed (addr
, siggnal
, step
)
349 step_start_function
= find_pc_function (read_pc ());
353 if (addr
== (CORE_ADDR
)-1)
355 /* If there is a breakpoint at the address we will resume at,
356 step one instruction before inserting breakpoints
357 so that we do not stop right away. */
359 if (!pc_changed
&& breakpoint_here_p (read_pc ()))
365 if (trap_expected_after_continue
)
367 /* If (step == 0), a trap will be automatically generated after
368 the first instruction is executed. Force step one
369 instruction to clear this condition. This should not occur
370 if step is nonzero, but it is harmless in that case. */
372 trap_expected_after_continue
= 0;
376 /* We will get a trace trap after one instruction.
377 Continue it automatically and insert breakpoints then. */
381 int temp
= insert_breakpoints ();
384 print_sys_errmsg ("ptrace", temp
);
385 error ("Cannot insert breakpoints.\n\
386 The same program may be running in another process.");
388 breakpoints_inserted
= 1;
391 /* Install inferior's terminal modes. */
392 target_terminal_inferior ();
395 stop_signal
= siggnal
;
396 /* If this signal should not be seen by program,
397 give it zero. Used for debugging signals. */
398 else if (stop_signal
< NSIG
&& !signal_program
[stop_signal
])
401 /* Resume inferior. */
402 resume (oneproc
|| step
|| bpstat_should_step (), stop_signal
);
404 /* Wait for it to stop (if not standalone)
405 and in any case decode why it stopped, and act accordingly. */
407 wait_for_inferior ();
411 /* Record the pc and sp of the program the last time it stopped.
412 These are just used internally by wait_for_inferior, but need
413 to be preserved over calls to it and cleared when the inferior
415 static CORE_ADDR prev_pc
;
416 static CORE_ADDR prev_sp
;
417 static CORE_ADDR prev_func_start
;
418 static char *prev_func_name
;
421 /* Start remote-debugging of a machine over a serial link. */
426 init_wait_for_inferior ();
427 clear_proceed_status ();
428 stop_soon_quietly
= 1;
430 wait_for_inferior ();
434 /* Initialize static vars when a new inferior begins. */
437 init_wait_for_inferior ()
439 /* These are meaningless until the first time through wait_for_inferior. */
443 prev_func_name
= NULL
;
445 trap_expected_after_continue
= 0;
446 breakpoints_inserted
= 0;
447 mark_breakpoints_out ();
448 stop_signal
= 0; /* Don't confuse first call to proceed(). */
452 delete_breakpoint_current_contents (arg
)
455 struct breakpoint
**breakpointp
= (struct breakpoint
**)arg
;
456 if (*breakpointp
!= NULL
)
457 delete_breakpoint (*breakpointp
);
460 /* Wait for control to return from inferior to debugger.
461 If inferior gets a signal, we may decide to start it up again
462 instead of returning. That is why there is a loop in this function.
463 When this function actually returns it means the inferior
464 should be left stopped and GDB should read more commands. */
469 struct cleanup
*old_cleanups
;
474 CORE_ADDR stop_func_start
;
475 char *stop_func_name
;
476 CORE_ADDR prologue_pc
, tmp
;
477 struct symtab_and_line sal
;
478 int remove_breakpoints_on_following_step
= 0;
480 int handling_longjmp
= 0; /* FIXME */
481 struct symtab
*symtab
;
482 struct breakpoint
*step_resume_breakpoint
= NULL
;
484 old_cleanups
= make_cleanup (delete_breakpoint_current_contents
,
485 &step_resume_breakpoint
);
486 sal
= find_pc_line(prev_pc
, 0);
487 current_line
= sal
.line
;
491 /* Clean up saved state that will become invalid. */
493 flush_cached_frames ();
494 registers_changed ();
498 #ifdef SIGTRAP_STOP_AFTER_LOAD
500 /* Somebody called load(2), and it gave us a "trap signal after load".
501 Ignore it gracefully. */
503 SIGTRAP_STOP_AFTER_LOAD (w
);
506 /* See if the process still exists; clean up if it doesn't. */
509 target_terminal_ours (); /* Must do this before mourn anyway */
511 printf_filtered ("\nProgram exited with code 0%o.\n",
512 (unsigned int)WEXITSTATUS (w
));
515 printf_filtered ("\nProgram exited normally.\n");
517 target_mourn_inferior ();
518 #ifdef NO_SINGLE_STEP
521 stop_print_frame
= 0;
524 else if (!WIFSTOPPED (w
))
528 stop_print_frame
= 0;
529 stop_signal
= WTERMSIG (w
);
530 target_terminal_ours (); /* Must do this before mourn anyway */
531 target_kill (); /* kill mourns as well */
532 #ifdef PRINT_RANDOM_SIGNAL
533 printf_filtered ("\nProgram terminated: ");
534 PRINT_RANDOM_SIGNAL (stop_signal
);
536 printf_filtered ("\nProgram terminated with signal ");
537 signame
= strsigno (stop_signal
);
539 printf_filtered ("%d", stop_signal
);
541 /* Do we need to print the number in addition to the name? */
542 printf_filtered ("%s (%d)", signame
, stop_signal
);
543 printf_filtered (", %s\n", safe_strsignal (stop_signal
));
545 printf_filtered ("The program no longer exists.\n");
547 #ifdef NO_SINGLE_STEP
553 #ifdef NO_SINGLE_STEP
555 single_step (0); /* This actually cleans up the ss */
556 #endif /* NO_SINGLE_STEP */
558 /* If PC is pointing at a nullified instruction, then step beyond it so that
559 the user won't be confused when GDB appears to be ready to execute it. */
561 if (INSTRUCTION_NULLIFIED
)
567 stop_pc
= read_pc ();
568 set_current_frame ( create_new_frame (read_fp (),
571 stop_frame_address
= FRAME_FP (get_current_frame ());
572 stop_sp
= read_sp ();
575 /* Don't care about return value; stop_func_start and stop_func_name
576 will both be 0 if it doesn't work. */
577 find_pc_partial_function (stop_pc
, &stop_func_name
, &stop_func_start
);
578 stop_func_start
+= FUNCTION_START_OFFSET
;
580 bpstat_clear (&stop_bpstat
);
582 stop_stack_dummy
= 0;
583 stop_print_frame
= 1;
585 stopped_by_random_signal
= 0;
586 breakpoints_failed
= 0;
588 /* Look at the cause of the stop, and decide what to do.
589 The alternatives are:
590 1) break; to really stop and return to the debugger,
591 2) drop through to start up again
592 (set another_trap to 1 to single step once)
593 3) set random_signal to 1, and the decision between 1 and 2
594 will be made according to the signal handling tables. */
596 stop_signal
= WSTOPSIG (w
);
598 /* First, distinguish signals caused by the debugger from signals
599 that have to do with the program's own actions.
600 Note that breakpoint insns may cause SIGTRAP or SIGILL
601 or SIGEMT, depending on the operating system version.
602 Here we detect when a SIGILL or SIGEMT is really a breakpoint
603 and change it to SIGTRAP. */
605 if (stop_signal
== SIGTRAP
606 || (breakpoints_inserted
&&
607 (stop_signal
== SIGILL
609 || stop_signal
== SIGEMT
612 || stop_soon_quietly
)
614 if (stop_signal
== SIGTRAP
&& stop_after_trap
)
616 stop_print_frame
= 0;
619 if (stop_soon_quietly
)
622 /* Don't even think about breakpoints
623 if just proceeded over a breakpoint.
625 However, if we are trying to proceed over a breakpoint
626 and end up in sigtramp, then step_resume_breakpoint
627 will be set and we should check whether we've hit the
629 if (stop_signal
== SIGTRAP
&& trap_expected
630 && step_resume_breakpoint
== NULL
)
631 bpstat_clear (&stop_bpstat
);
634 /* See if there is a breakpoint at the current PC. */
635 #if DECR_PC_AFTER_BREAK
636 /* Notice the case of stepping through a jump
637 that lands just after a breakpoint.
638 Don't confuse that with hitting the breakpoint.
639 What we check for is that 1) stepping is going on
640 and 2) the pc before the last insn does not match
641 the address of the breakpoint before the current pc. */
642 if (prev_pc
== stop_pc
- DECR_PC_AFTER_BREAK
644 || step_resume_breakpoint
!= NULL
645 || handling_longjmp
/* FIXME */)
646 #endif /* DECR_PC_AFTER_BREAK not zero */
649 bpstat_stop_status (&stop_pc
, stop_frame_address
);
650 /* Following in case break condition called a
652 stop_print_frame
= 1;
656 if (stop_signal
== SIGTRAP
)
658 = !(bpstat_explains_signal (stop_bpstat
)
660 || PC_IN_CALL_DUMMY (stop_pc
, stop_sp
, stop_frame_address
)
661 || (step_range_end
&& step_resume_breakpoint
== NULL
));
665 = !(bpstat_explains_signal (stop_bpstat
)
666 /* End of a stack dummy. Some systems (e.g. Sony
667 news) give another signal besides SIGTRAP,
668 so check here as well as above. */
669 || PC_IN_CALL_DUMMY (stop_pc
, stop_sp
, stop_frame_address
)
672 stop_signal
= SIGTRAP
;
678 /* For the program's own signals, act according to
679 the signal handling tables. */
683 /* Signal not for debugging purposes. */
686 stopped_by_random_signal
= 1;
688 if (stop_signal
>= NSIG
689 || signal_print
[stop_signal
])
693 target_terminal_ours_for_output ();
694 #ifdef PRINT_RANDOM_SIGNAL
695 PRINT_RANDOM_SIGNAL (stop_signal
);
697 printf_filtered ("\nProgram received signal ");
698 signame
= strsigno (stop_signal
);
700 printf_filtered ("%d", stop_signal
);
702 /* Do we need to print the number as well as the name? */
703 printf_filtered ("%s (%d)", signame
, stop_signal
);
704 printf_filtered (", %s\n", safe_strsignal (stop_signal
));
705 #endif /* PRINT_RANDOM_SIGNAL */
708 if (stop_signal
>= NSIG
709 || signal_stop
[stop_signal
])
711 /* If not going to stop, give terminal back
712 if we took it away. */
714 target_terminal_inferior ();
716 /* Clear the signal if it should not be passed. */
717 if (signal_program
[stop_signal
] == 0)
720 /* I'm not sure whether this needs to be check_sigtramp2 or
721 whether it could/should be keep_going. */
722 goto check_sigtramp2
;
725 /* Handle cases caused by hitting a breakpoint. */
727 CORE_ADDR jmp_buf_pc
;
728 struct bpstat_what what
= bpstat_what (stop_bpstat
);
730 switch (what
.main_action
)
732 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
733 /* If we hit the breakpoint at longjmp, disable it for the
734 duration of this command. Then, install a temporary
735 breakpoint at the target of the jmp_buf. */
736 disable_longjmp_breakpoint();
737 remove_breakpoints ();
738 breakpoints_inserted
= 0;
739 if (!GET_LONGJMP_TARGET(&jmp_buf_pc
)) goto keep_going
;
741 /* Need to blow away step-resume breakpoint, as it
742 interferes with us */
743 if (step_resume_breakpoint
!= NULL
)
745 delete_breakpoint (step_resume_breakpoint
);
746 step_resume_breakpoint
= NULL
;
747 what
.step_resume
= 0;
751 /* FIXME - Need to implement nested temporary breakpoints */
752 if (step_over_calls
> 0)
753 set_longjmp_resume_breakpoint(jmp_buf_pc
,
754 get_current_frame());
757 set_longjmp_resume_breakpoint(jmp_buf_pc
, NULL
);
758 handling_longjmp
= 1; /* FIXME */
761 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
762 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE
:
763 remove_breakpoints ();
764 breakpoints_inserted
= 0;
766 /* FIXME - Need to implement nested temporary breakpoints */
768 && (stop_frame_address
769 INNER_THAN step_frame_address
))
775 disable_longjmp_breakpoint();
776 handling_longjmp
= 0; /* FIXME */
777 if (what
.main_action
== BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
)
779 /* else fallthrough */
781 case BPSTAT_WHAT_SINGLE
:
782 if (breakpoints_inserted
)
783 remove_breakpoints ();
784 breakpoints_inserted
= 0;
786 /* Still need to check other stuff, at least the case
787 where we are stepping and step out of the right range. */
790 case BPSTAT_WHAT_STOP_NOISY
:
791 stop_print_frame
= 1;
792 /* We are about to nuke the step_resume_breakpoint via the
793 cleanup chain, so no need to worry about it here. */
796 case BPSTAT_WHAT_STOP_SILENT
:
797 stop_print_frame
= 0;
798 /* We are about to nuke the step_resume_breakpoint via the
799 cleanup chain, so no need to worry about it here. */
802 case BPSTAT_WHAT_KEEP_CHECKING
:
806 if (what
.step_resume
)
808 delete_breakpoint (step_resume_breakpoint
);
809 step_resume_breakpoint
= NULL
;
811 /* If were waiting for a trap, hitting the step_resume_break
812 doesn't count as getting it. */
818 /* We come here if we hit a breakpoint but should not
819 stop for it. Possibly we also were stepping
820 and should stop for that. So fall through and
821 test for stepping. But, if not stepping,
824 /* If this is the breakpoint at the end of a stack dummy,
825 just stop silently. */
826 if (PC_IN_CALL_DUMMY (stop_pc
, stop_sp
, stop_frame_address
))
828 stop_print_frame
= 0;
829 stop_stack_dummy
= 1;
831 trap_expected_after_continue
= 1;
836 if (step_resume_breakpoint
)
837 /* Having a step-resume breakpoint overrides anything
838 else having to do with stepping commands until
839 that breakpoint is reached. */
840 /* I suspect this could/should be keep_going, because if the
841 check_sigtramp2 check succeeds, then it will put in another
842 step_resume_breakpoint, and we aren't (yet) prepared to nest
844 goto check_sigtramp2
;
846 if (step_range_end
== 0)
847 /* Likewise if we aren't even stepping. */
848 /* I'm not sure whether this needs to be check_sigtramp2 or
849 whether it could/should be keep_going. */
850 goto check_sigtramp2
;
852 /* If stepping through a line, keep going if still within it. */
853 if (stop_pc
>= step_range_start
854 && stop_pc
< step_range_end
855 /* The step range might include the start of the
856 function, so if we are at the start of the
857 step range and either the stack or frame pointers
858 just changed, we've stepped outside */
859 && !(stop_pc
== step_range_start
860 && stop_frame_address
861 && (stop_sp INNER_THAN prev_sp
862 || stop_frame_address
!= step_frame_address
)))
864 /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal.
865 So definately need to check for sigtramp here. */
866 goto check_sigtramp2
;
869 /* We stepped out of the stepping range. See if that was due
870 to a subroutine call that we should proceed to the end of. */
872 /* Did we just take a signal? */
873 if (IN_SIGTRAMP (stop_pc
, stop_func_name
)
874 && !IN_SIGTRAMP (prev_pc
, prev_func_name
))
876 /* This code is needed at least in the following case:
877 The user types "next" and then a signal arrives (before
878 the "next" is done). */
879 /* We've just taken a signal; go until we are back to
880 the point where we took it and one more. */
882 struct symtab_and_line sr_sal
;
885 sr_sal
.symtab
= NULL
;
887 step_resume_breakpoint
=
888 set_momentary_breakpoint (sr_sal
, get_current_frame (),
890 if (breakpoints_inserted
)
891 insert_breakpoints ();
894 /* If this is stepi or nexti, make sure that the stepping range
895 gets us past that instruction. */
896 if (step_range_end
== 1)
897 /* FIXME: Does this run afoul of the code below which, if
898 we step into the middle of a line, resets the stepping
900 step_range_end
= (step_range_start
= prev_pc
) + 1;
902 remove_breakpoints_on_following_step
= 1;
908 /* Do this after the IN_SIGTRAMP check; it might give
910 prologue_pc
= stop_func_start
;
911 SKIP_PROLOGUE (prologue_pc
);
914 /* ==> See comments at top of file on this algorithm. <==*/
916 if ((stop_pc
== stop_func_start
917 || IN_SOLIB_TRAMPOLINE (stop_pc
, stop_func_name
))
918 && (stop_func_start
!= prev_func_start
919 || prologue_pc
!= stop_func_start
920 || stop_sp
!= prev_sp
))
922 /* It's a subroutine call. */
924 if (step_over_calls
== 0)
926 /* I presume that step_over_calls is only 0 when we're
927 supposed to be stepping at the assembly language level
928 ("stepi"). Just stop. */
933 if (step_over_calls
> 0)
934 /* We're doing a "next". */
935 goto step_over_function
;
937 /* If we are in a function call trampoline (a stub between
938 the calling routine and the real function), locate the real
939 function. That's what tells us (a) whether we want to step
940 into it at all, and (b) what prologue we want to run to
941 the end of, if we do step into it. */
942 tmp
= SKIP_TRAMPOLINE_CODE (stop_pc
);
944 stop_func_start
= tmp
;
946 /* If we have line number information for the function we
947 are thinking of stepping into, step into it.
949 If there are several symtabs at that PC (e.g. with include
950 files), just want to know whether *any* of them have line
951 numbers. find_pc_line handles this. */
953 struct symtab_and_line tmp_sal
;
955 tmp_sal
= find_pc_line (stop_func_start
, 0);
956 if (tmp_sal
.line
!= 0)
957 goto step_into_function
;
961 /* A subroutine call has happened. */
963 /* Set a special breakpoint after the return */
964 struct symtab_and_line sr_sal
;
967 (SAVED_PC_AFTER_CALL (get_current_frame ()));
968 sr_sal
.symtab
= NULL
;
970 step_resume_breakpoint
=
971 set_momentary_breakpoint (sr_sal
, get_current_frame (),
973 if (breakpoints_inserted
)
974 insert_breakpoints ();
979 /* Subroutine call with source code we should not step over.
980 Do step to the first line of code in it. */
981 SKIP_PROLOGUE (stop_func_start
);
982 sal
= find_pc_line (stop_func_start
, 0);
983 /* Use the step_resume_break to step until
984 the end of the prologue, even if that involves jumps
985 (as it seems to on the vax under 4.2). */
986 /* If the prologue ends in the middle of a source line,
987 continue to the end of that source line.
988 Otherwise, just go to end of prologue. */
989 #ifdef PROLOGUE_FIRSTLINE_OVERLAP
990 /* no, don't either. It skips any code that's
991 legitimately on the first line. */
993 if (sal
.end
&& sal
.pc
!= stop_func_start
)
994 stop_func_start
= sal
.end
;
997 if (stop_func_start
== stop_pc
)
999 /* We are already there: stop now. */
1004 /* Put the step-breakpoint there and go until there. */
1006 struct symtab_and_line sr_sal
;
1008 sr_sal
.pc
= stop_func_start
;
1009 sr_sal
.symtab
= NULL
;
1011 /* Do not specify what the fp should be when we stop
1012 since on some machines the prologue
1013 is where the new fp value is established. */
1014 step_resume_breakpoint
=
1015 set_momentary_breakpoint (sr_sal
, (CORE_ADDR
)0,
1017 if (breakpoints_inserted
)
1018 insert_breakpoints ();
1020 /* And make sure stepping stops right away then. */
1021 step_range_end
= step_range_start
;
1026 /* We've wandered out of the step range (but haven't done a
1027 subroutine call or return). (Is that true? I think we get
1028 here if we did a return and maybe a longjmp). */
1030 sal
= find_pc_line(stop_pc
, 0);
1032 if (step_range_end
== 1)
1034 /* It is stepi or nexti. We always want to stop stepping after
1042 /* We have no line number information. That means to stop
1043 stepping (does this always happen right after one instruction,
1044 when we do "s" in a function with no line numbers,
1045 or can this happen as a result of a return or longjmp?). */
1050 if (stop_pc
== sal
.pc
&& current_line
!= sal
.line
)
1052 /* We are at the start of a different line. So stop. Note that
1053 we don't stop if we step into the middle of a different line.
1054 That is said to make things like for (;;) statements work
1060 /* We aren't done stepping.
1062 Optimize by setting the stepping range to the line.
1063 (We might not be in the original line, but if we entered a
1064 new line in mid-statement, we continue stepping. This makes
1065 things like for(;;) statements work better.) */
1066 step_range_start
= sal
.pc
;
1067 step_range_end
= sal
.end
;
1072 && IN_SIGTRAMP (stop_pc
, stop_func_name
)
1073 && !IN_SIGTRAMP (prev_pc
, prev_func_name
))
1075 /* What has happened here is that we have just stepped the inferior
1076 with a signal (because it is a signal which shouldn't make
1077 us stop), thus stepping into sigtramp.
1079 So we need to set a step_resume_break_address breakpoint
1080 and continue until we hit it, and then step. FIXME: This should
1081 be more enduring than a step_resume breakpoint; we should know
1082 that we will later need to keep going rather than re-hitting
1083 the breakpoint here (see testsuite/gdb.t06/signals.exp where
1084 it says "exceedingly difficult"). */
1085 struct symtab_and_line sr_sal
;
1087 sr_sal
.pc
= prev_pc
;
1088 sr_sal
.symtab
= NULL
;
1090 step_resume_breakpoint
=
1091 set_momentary_breakpoint (sr_sal
, get_current_frame (),
1093 if (breakpoints_inserted
)
1094 insert_breakpoints ();
1096 remove_breakpoints_on_following_step
= 1;
1101 /* Come to this label when you need to resume the inferior.
1102 It's really much cleaner to do a goto than a maze of if-else
1105 /* Save the pc before execution, to compare with pc after stop. */
1106 prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
1107 prev_func_start
= stop_func_start
; /* Ok, since if DECR_PC_AFTER
1108 BREAK is defined, the
1109 original pc would not have
1110 been at the start of a
1112 prev_func_name
= stop_func_name
;
1115 /* If we did not do break;, it means we should keep
1116 running the inferior and not return to debugger. */
1118 if (trap_expected
&& stop_signal
!= SIGTRAP
)
1120 /* We took a signal (which we are supposed to pass through to
1121 the inferior, else we'd have done a break above) and we
1122 haven't yet gotten our trap. Simply continue. */
1123 resume ((step_range_end
&& step_resume_breakpoint
== NULL
)
1124 || (trap_expected
&& step_resume_breakpoint
== NULL
)
1125 || bpstat_should_step (),
1130 /* Either the trap was not expected, but we are continuing
1131 anyway (the user asked that this signal be passed to the
1134 The signal was SIGTRAP, e.g. it was our signal, but we
1135 decided we should resume from it.
1137 We're going to run this baby now!
1139 Insert breakpoints now, unless we are trying
1140 to one-proceed past a breakpoint. */
1141 /* If we've just finished a special step resume and we don't
1142 want to hit a breakpoint, pull em out. */
1143 if (step_resume_breakpoint
== NULL
&&
1144 remove_breakpoints_on_following_step
)
1146 remove_breakpoints_on_following_step
= 0;
1147 remove_breakpoints ();
1148 breakpoints_inserted
= 0;
1150 else if (!breakpoints_inserted
&&
1151 (step_resume_breakpoint
!= NULL
|| !another_trap
))
1153 breakpoints_failed
= insert_breakpoints ();
1154 if (breakpoints_failed
)
1156 breakpoints_inserted
= 1;
1159 trap_expected
= another_trap
;
1161 if (stop_signal
== SIGTRAP
)
1164 #ifdef SHIFT_INST_REGS
1165 /* I'm not sure when this following segment applies. I do know, now,
1166 that we shouldn't rewrite the regs when we were stopped by a
1167 random signal from the inferior process. */
1169 if (!bpstat_explains_signal (stop_bpstat
)
1170 && (stop_signal
!= SIGCLD
)
1171 && !stopped_by_random_signal
)
1173 CORE_ADDR pc_contents
= read_register (PC_REGNUM
);
1174 CORE_ADDR npc_contents
= read_register (NPC_REGNUM
);
1175 if (pc_contents
!= npc_contents
)
1177 write_register (NNPC_REGNUM
, npc_contents
);
1178 write_register (NPC_REGNUM
, pc_contents
);
1181 #endif /* SHIFT_INST_REGS */
1183 resume ((step_resume_breakpoint
== NULL
1184 && !handling_longjmp
1187 || bpstat_should_step (),
1193 if (target_has_execution
)
1195 /* Assuming the inferior still exists, set these up for next
1196 time, just like we did above if we didn't break out of the
1198 prev_pc
= read_pc ();
1199 prev_func_start
= stop_func_start
;
1200 prev_func_name
= stop_func_name
;
1203 do_cleanups (old_cleanups
);
1206 /* Here to return control to GDB when the inferior stops for real.
1207 Print appropriate messages, remove breakpoints, give terminal our modes.
1209 STOP_PRINT_FRAME nonzero means print the executing frame
1210 (pc, function, args, file, line number and line text).
1211 BREAKPOINTS_FAILED nonzero means stop was due to error
1212 attempting to insert breakpoints. */
1217 /* Make sure that the current_frame's pc is correct. This
1218 is a correction for setting up the frame info before doing
1219 DECR_PC_AFTER_BREAK */
1220 if (target_has_execution
)
1221 (get_current_frame ())->pc
= read_pc ();
1223 if (breakpoints_failed
)
1225 target_terminal_ours_for_output ();
1226 print_sys_errmsg ("ptrace", breakpoints_failed
);
1227 printf_filtered ("Stopped; cannot insert breakpoints.\n\
1228 The same program may be running in another process.\n");
1231 if (target_has_execution
&& breakpoints_inserted
)
1232 if (remove_breakpoints ())
1234 target_terminal_ours_for_output ();
1235 printf_filtered ("Cannot remove breakpoints because program is no longer writable.\n\
1236 It might be running in another process.\n\
1237 Further execution is probably impossible.\n");
1240 breakpoints_inserted
= 0;
1242 /* Delete the breakpoint we stopped at, if it wants to be deleted.
1243 Delete any breakpoint that is to be deleted at the next stop. */
1245 breakpoint_auto_delete (stop_bpstat
);
1247 /* If an auto-display called a function and that got a signal,
1248 delete that auto-display to avoid an infinite recursion. */
1250 if (stopped_by_random_signal
)
1251 disable_current_display ();
1253 if (step_multi
&& stop_step
)
1256 target_terminal_ours ();
1258 /* Look up the hook_stop and run it if it exists. */
1260 if (stop_command
->hook
)
1262 catch_errors (hook_stop_stub
, (char *)stop_command
->hook
,
1263 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
1266 if (!target_has_stack
)
1269 /* Select innermost stack frame except on return from a stack dummy routine,
1270 or if the program has exited. Print it without a level number if
1271 we have changed functions or hit a breakpoint. Print source line
1273 if (!stop_stack_dummy
)
1275 select_frame (get_current_frame (), 0);
1277 if (stop_print_frame
)
1281 source_only
= bpstat_print (stop_bpstat
);
1282 source_only
= source_only
||
1284 && step_frame_address
== stop_frame_address
1285 && step_start_function
== find_pc_function (stop_pc
));
1287 print_stack_frame (selected_frame
, -1, source_only
? -1: 1);
1289 /* Display the auto-display expressions. */
1294 /* Save the function value return registers, if we care.
1295 We might be about to restore their previous contents. */
1296 if (proceed_to_finish
)
1297 read_register_bytes (0, stop_registers
, REGISTER_BYTES
);
1299 if (stop_stack_dummy
)
1301 /* Pop the empty frame that contains the stack dummy.
1302 POP_FRAME ends with a setting of the current frame, so we
1303 can use that next. */
1305 select_frame (get_current_frame (), 0);
1310 hook_stop_stub (cmd
)
1313 execute_user_command ((struct cmd_list_element
*)cmd
, 0);
1317 int signal_stop_state (signo
)
1320 return ((signo
>= 0 && signo
< NSIG
) ? signal_stop
[signo
] : 0);
1323 int signal_print_state (signo
)
1326 return ((signo
>= 0 && signo
< NSIG
) ? signal_print
[signo
] : 0);
1329 int signal_pass_state (signo
)
1332 return ((signo
>= 0 && signo
< NSIG
) ? signal_program
[signo
] : 0);
1338 printf_filtered ("Signal\t\tStop\tPrint\tPass to program\tDescription\n");
1342 sig_print_info (number
)
1347 if ((name
= strsigno (number
)) == NULL
)
1348 printf_filtered ("%d\t\t", number
);
1350 printf_filtered ("%s (%d)\t", name
, number
);
1351 printf_filtered ("%s\t", signal_stop
[number
] ? "Yes" : "No");
1352 printf_filtered ("%s\t", signal_print
[number
] ? "Yes" : "No");
1353 printf_filtered ("%s\t\t", signal_program
[number
] ? "Yes" : "No");
1354 printf_filtered ("%s\n", safe_strsignal (number
));
1357 /* Specify how various signals in the inferior should be handled. */
1360 handle_command (args
, from_tty
)
1365 int digits
, wordlen
;
1366 int sigfirst
, signum
, siglast
;
1369 unsigned char *sigs
;
1370 struct cleanup
*old_chain
;
1374 error_no_arg ("signal to handle");
1377 /* Allocate and zero an array of flags for which signals to handle. */
1379 nsigs
= signo_max () + 1;
1380 sigs
= (unsigned char *) alloca (nsigs
);
1381 memset (sigs
, 0, nsigs
);
1383 /* Break the command line up into args. */
1385 argv
= buildargv (args
);
1390 old_chain
= make_cleanup (freeargv
, (char *) argv
);
1392 /* Walk through the args, looking for signal numbers, signal names, and
1393 actions. Signal numbers and signal names may be interspersed with
1394 actions, with the actions being performed for all signals cumulatively
1395 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
1397 while (*argv
!= NULL
)
1399 wordlen
= strlen (*argv
);
1400 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++) {;}
1402 sigfirst
= siglast
= -1;
1404 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
1406 /* Apply action to all signals except those used by the
1407 debugger. Silently skip those. */
1410 siglast
= nsigs
- 1;
1412 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
1414 SET_SIGS (nsigs
, sigs
, signal_stop
);
1415 SET_SIGS (nsigs
, sigs
, signal_print
);
1417 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
1419 UNSET_SIGS (nsigs
, sigs
, signal_program
);
1421 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
1423 SET_SIGS (nsigs
, sigs
, signal_print
);
1425 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
1427 SET_SIGS (nsigs
, sigs
, signal_program
);
1429 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
1431 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
1433 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
1435 SET_SIGS (nsigs
, sigs
, signal_program
);
1437 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
1439 UNSET_SIGS (nsigs
, sigs
, signal_print
);
1440 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
1442 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
1444 UNSET_SIGS (nsigs
, sigs
, signal_program
);
1446 else if (digits
> 0)
1448 sigfirst
= siglast
= atoi (*argv
);
1449 if ((*argv
)[digits
] == '-')
1451 siglast
= atoi ((*argv
) + digits
+ 1);
1453 if (sigfirst
> siglast
)
1455 /* Bet he didn't figure we'd think of this case... */
1460 if (sigfirst
< 0 || sigfirst
>= nsigs
)
1462 error ("Signal %d not in range 0-%d", sigfirst
, nsigs
- 1);
1464 if (siglast
< 0 || siglast
>= nsigs
)
1466 error ("Signal %d not in range 0-%d", siglast
, nsigs
- 1);
1469 else if ((signum
= strtosigno (*argv
)) != 0)
1471 sigfirst
= siglast
= signum
;
1475 /* Not a number and not a recognized flag word => complain. */
1476 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv
);
1479 /* If any signal numbers or symbol names were found, set flags for
1480 which signals to apply actions to. */
1482 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
1488 if (!allsigs
&& !sigs
[signum
])
1490 if (query ("%s is used by the debugger.\nAre you sure you want to change it? ", strsigno (signum
)))
1496 printf ("Not confirmed, unchanged.\n");
1510 target_notice_signals();
1514 /* Show the results. */
1515 sig_print_header ();
1516 for (signum
= 0; signum
< nsigs
; signum
++)
1520 sig_print_info (signum
);
1525 do_cleanups (old_chain
);
1528 /* Print current contents of the tables set by the handle command. */
1531 signals_info (signum_exp
, from_tty
)
1536 sig_print_header ();
1540 /* First see if this is a symbol name. */
1541 i
= strtosigno (signum_exp
);
1544 /* Nope, maybe it's an address which evaluates to a signal
1546 i
= parse_and_eval_address (signum_exp
);
1547 if (i
>= NSIG
|| i
< 0)
1548 error ("Signal number out of bounds.");
1554 printf_filtered ("\n");
1555 for (i
= 0; i
< NSIG
; i
++)
1562 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
1565 /* Save all of the information associated with the inferior<==>gdb
1566 connection. INF_STATUS is a pointer to a "struct inferior_status"
1567 (defined in inferior.h). */
1570 save_inferior_status (inf_status
, restore_stack_info
)
1571 struct inferior_status
*inf_status
;
1572 int restore_stack_info
;
1574 inf_status
->pc_changed
= pc_changed
;
1575 inf_status
->stop_signal
= stop_signal
;
1576 inf_status
->stop_pc
= stop_pc
;
1577 inf_status
->stop_frame_address
= stop_frame_address
;
1578 inf_status
->stop_step
= stop_step
;
1579 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
1580 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
1581 inf_status
->trap_expected
= trap_expected
;
1582 inf_status
->step_range_start
= step_range_start
;
1583 inf_status
->step_range_end
= step_range_end
;
1584 inf_status
->step_frame_address
= step_frame_address
;
1585 inf_status
->step_over_calls
= step_over_calls
;
1586 inf_status
->stop_after_trap
= stop_after_trap
;
1587 inf_status
->stop_soon_quietly
= stop_soon_quietly
;
1588 /* Save original bpstat chain here; replace it with copy of chain.
1589 If caller's caller is walking the chain, they'll be happier if we
1590 hand them back the original chain when restore_i_s is called. */
1591 inf_status
->stop_bpstat
= stop_bpstat
;
1592 stop_bpstat
= bpstat_copy (stop_bpstat
);
1593 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
1594 inf_status
->restore_stack_info
= restore_stack_info
;
1595 inf_status
->proceed_to_finish
= proceed_to_finish
;
1597 memcpy (inf_status
->stop_registers
, stop_registers
, REGISTER_BYTES
);
1599 record_selected_frame (&(inf_status
->selected_frame_address
),
1600 &(inf_status
->selected_level
));
1605 restore_inferior_status (inf_status
)
1606 struct inferior_status
*inf_status
;
1609 int level
= inf_status
->selected_level
;
1611 pc_changed
= inf_status
->pc_changed
;
1612 stop_signal
= inf_status
->stop_signal
;
1613 stop_pc
= inf_status
->stop_pc
;
1614 stop_frame_address
= inf_status
->stop_frame_address
;
1615 stop_step
= inf_status
->stop_step
;
1616 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
1617 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
1618 trap_expected
= inf_status
->trap_expected
;
1619 step_range_start
= inf_status
->step_range_start
;
1620 step_range_end
= inf_status
->step_range_end
;
1621 step_frame_address
= inf_status
->step_frame_address
;
1622 step_over_calls
= inf_status
->step_over_calls
;
1623 stop_after_trap
= inf_status
->stop_after_trap
;
1624 stop_soon_quietly
= inf_status
->stop_soon_quietly
;
1625 bpstat_clear (&stop_bpstat
);
1626 stop_bpstat
= inf_status
->stop_bpstat
;
1627 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
1628 proceed_to_finish
= inf_status
->proceed_to_finish
;
1630 memcpy (stop_registers
, inf_status
->stop_registers
, REGISTER_BYTES
);
1632 /* The inferior can be gone if the user types "print exit(0)"
1633 (and perhaps other times). */
1634 if (target_has_stack
&& inf_status
->restore_stack_info
)
1636 fid
= find_relative_frame (get_current_frame (),
1639 /* If inf_status->selected_frame_address is NULL, there was no
1640 previously selected frame. */
1642 FRAME_FP (fid
) != inf_status
->selected_frame_address
||
1646 /* I'm not sure this error message is a good idea. I have
1647 only seen it occur after "Can't continue previously
1648 requested operation" (we get called from do_cleanups), in
1649 which case it just adds insult to injury (one confusing
1650 error message after another. Besides which, does the
1651 user really care if we can't restore the previously
1653 fprintf (stderr
, "Unable to restore previously selected frame.\n");
1655 select_frame (get_current_frame (), 0);
1659 select_frame (fid
, inf_status
->selected_level
);
1665 _initialize_infrun ()
1668 register int numsigs
;
1670 add_info ("signals", signals_info
,
1671 "What debugger does when program gets various signals.\n\
1672 Specify a signal number as argument to print info on that signal only.");
1673 add_info_alias ("handle", "signals", 0);
1675 add_com ("handle", class_run
, handle_command
,
1676 "Specify how to handle a signal.\n\
1677 Args are signal numbers and actions to apply to those signals.\n\
1678 Signal numbers may be numeric (ex. 11) or symbolic (ex. SIGSEGV).\n\
1679 Numeric ranges may be specified with the form LOW-HIGH (ex. 14-21).\n\
1680 The special arg \"all\" is recognized to mean all signals except those\n\
1681 used by the debugger, typically SIGTRAP and SIGINT.\n\
1682 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
1683 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
1684 Stop means reenter debugger if this signal happens (implies print).\n\
1685 Print means print a message if this signal happens.\n\
1686 Pass means let program see this signal; otherwise program doesn't know.\n\
1687 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
1688 Pass and Stop may be combined.");
1690 stop_command
= add_cmd ("stop", class_obscure
, not_just_help_class_command
,
1691 "There is no `stop' command, but you can set a hook on `stop'.\n\
1692 This allows you to set a list of commands to be run each time execution\n\
1693 of the program stops.", &cmdlist
);
1695 numsigs
= signo_max () + 1;
1696 signal_stop
= (unsigned char *)
1697 xmalloc (sizeof (signal_stop
[0]) * numsigs
);
1698 signal_print
= (unsigned char *)
1699 xmalloc (sizeof (signal_print
[0]) * numsigs
);
1700 signal_program
= (unsigned char *)
1701 xmalloc (sizeof (signal_program
[0]) * numsigs
);
1702 for (i
= 0; i
< numsigs
; i
++)
1705 signal_print
[i
] = 1;
1706 signal_program
[i
] = 1;
1709 /* Signals caused by debugger's own actions
1710 should not be given to the program afterwards. */
1711 signal_program
[SIGTRAP
] = 0;
1712 signal_program
[SIGINT
] = 0;
1714 /* Signals that are not errors should not normally enter the debugger. */
1716 signal_stop
[SIGALRM
] = 0;
1717 signal_print
[SIGALRM
] = 0;
1718 #endif /* SIGALRM */
1720 signal_stop
[SIGVTALRM
] = 0;
1721 signal_print
[SIGVTALRM
] = 0;
1722 #endif /* SIGVTALRM */
1724 signal_stop
[SIGPROF
] = 0;
1725 signal_print
[SIGPROF
] = 0;
1726 #endif /* SIGPROF */
1728 signal_stop
[SIGCHLD
] = 0;
1729 signal_print
[SIGCHLD
] = 0;
1730 #endif /* SIGCHLD */
1732 signal_stop
[SIGCLD
] = 0;
1733 signal_print
[SIGCLD
] = 0;
1736 signal_stop
[SIGIO
] = 0;
1737 signal_print
[SIGIO
] = 0;
1740 signal_stop
[SIGURG
] = 0;
1741 signal_print
[SIGURG
] = 0;