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 proceed is being used for a "finish" command or a similar
236 situation when stop_registers should be saved. */
238 int proceed_to_finish
;
240 /* Save register contents here when about to pop a stack dummy frame,
241 if-and-only-if proceed_to_finish is set.
242 Thus this contains the return value from the called function (assuming
243 values are returned in a register). */
245 char stop_registers
[REGISTER_BYTES
];
247 /* Nonzero if program stopped due to error trying to insert breakpoints. */
249 static int breakpoints_failed
;
251 /* Nonzero after stop if current stack frame should be printed. */
253 static int stop_print_frame
;
255 #ifdef NO_SINGLE_STEP
256 extern int one_stepped
; /* From machine dependent code */
257 extern void single_step (); /* Same. */
258 #endif /* NO_SINGLE_STEP */
261 /* Things to clean up if we QUIT out of resume (). */
264 resume_cleanups (arg
)
270 /* Resume the inferior, but allow a QUIT. This is useful if the user
271 wants to interrupt some lengthy single-stepping operation
272 (for child processes, the SIGINT goes to the inferior, and so
273 we get a SIGINT random_signal, but for remote debugging and perhaps
274 other targets, that's not true).
276 STEP nonzero if we should step (zero to continue instead).
277 SIG is the signal to give the inferior (zero for none). */
283 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
286 #ifdef CANNOT_STEP_BREAKPOINT
287 /* Most targets can step a breakpoint instruction, thus executing it
288 normally. But if this one cannot, just continue and we will hit
290 if (step
&& breakpoints_inserted
&& breakpoint_here_p (read_pc ()))
294 #ifdef NO_SINGLE_STEP
296 single_step(sig
); /* Do it the hard way, w/temp breakpoints */
297 step
= 0; /* ...and don't ask hardware to do it. */
301 /* Handle any optimized stores to the inferior NOW... */
302 #ifdef DO_DEFERRED_STORES
306 /* Install inferior's terminal modes. */
307 target_terminal_inferior ();
309 target_resume (inferior_pid
, step
, sig
);
310 discard_cleanups (old_cleanups
);
314 /* Clear out all variables saying what to do when inferior is continued.
315 First do this, then set the ones you want, then call `proceed'. */
318 clear_proceed_status ()
321 step_range_start
= 0;
323 step_frame_address
= 0;
324 step_over_calls
= -1;
326 stop_soon_quietly
= 0;
327 proceed_to_finish
= 0;
328 breakpoint_proceeded
= 1; /* We're about to proceed... */
330 /* Discard any remaining commands or status from previous stop. */
331 bpstat_clear (&stop_bpstat
);
334 /* Basic routine for continuing the program in various fashions.
336 ADDR is the address to resume at, or -1 for resume where stopped.
337 SIGGNAL is the signal to give it, or 0 for none,
338 or -1 for act according to how it stopped.
339 STEP is nonzero if should trap after one instruction.
340 -1 means return after that and print nothing.
341 You should probably set various step_... variables
342 before calling here, if you are stepping.
344 You should call clear_proceed_status before calling proceed. */
347 proceed (addr
, siggnal
, step
)
355 step_start_function
= find_pc_function (read_pc ());
359 if (addr
== (CORE_ADDR
)-1)
361 /* If there is a breakpoint at the address we will resume at,
362 step one instruction before inserting breakpoints
363 so that we do not stop right away. */
365 if (breakpoint_here_p (read_pc ()))
371 if (trap_expected_after_continue
)
373 /* If (step == 0), a trap will be automatically generated after
374 the first instruction is executed. Force step one
375 instruction to clear this condition. This should not occur
376 if step is nonzero, but it is harmless in that case. */
378 trap_expected_after_continue
= 0;
382 /* We will get a trace trap after one instruction.
383 Continue it automatically and insert breakpoints then. */
387 int temp
= insert_breakpoints ();
390 print_sys_errmsg ("ptrace", temp
);
391 error ("Cannot insert breakpoints.\n\
392 The same program may be running in another process.");
394 breakpoints_inserted
= 1;
398 stop_signal
= siggnal
;
399 /* If this signal should not be seen by program,
400 give it zero. Used for debugging signals. */
401 else if (stop_signal
< NSIG
&& !signal_program
[stop_signal
])
404 /* Resume inferior. */
405 resume (oneproc
|| step
|| bpstat_should_step (), stop_signal
);
407 /* Wait for it to stop (if not standalone)
408 and in any case decode why it stopped, and act accordingly. */
410 wait_for_inferior ();
414 /* Record the pc and sp of the program the last time it stopped.
415 These are just used internally by wait_for_inferior, but need
416 to be preserved over calls to it and cleared when the inferior
418 static CORE_ADDR prev_pc
;
419 static CORE_ADDR prev_sp
;
420 static CORE_ADDR prev_func_start
;
421 static char *prev_func_name
;
424 /* Start remote-debugging of a machine over a serial link. */
429 init_wait_for_inferior ();
430 clear_proceed_status ();
431 stop_soon_quietly
= 1;
433 wait_for_inferior ();
437 /* Initialize static vars when a new inferior begins. */
440 init_wait_for_inferior ()
442 /* These are meaningless until the first time through wait_for_inferior. */
446 prev_func_name
= NULL
;
448 trap_expected_after_continue
= 0;
449 breakpoints_inserted
= 0;
450 breakpoint_init_inferior ();
451 stop_signal
= 0; /* Don't confuse first call to proceed(). */
455 delete_breakpoint_current_contents (arg
)
458 struct breakpoint
**breakpointp
= (struct breakpoint
**)arg
;
459 if (*breakpointp
!= NULL
)
460 delete_breakpoint (*breakpointp
);
463 /* Wait for control to return from inferior to debugger.
464 If inferior gets a signal, we may decide to start it up again
465 instead of returning. That is why there is a loop in this function.
466 When this function actually returns it means the inferior
467 should be left stopped and GDB should read more commands. */
472 struct cleanup
*old_cleanups
;
476 CORE_ADDR stop_sp
= 0;
477 CORE_ADDR stop_func_start
;
478 CORE_ADDR stop_func_end
;
479 char *stop_func_name
;
480 CORE_ADDR prologue_pc
= 0, tmp
;
481 struct symtab_and_line sal
;
482 int remove_breakpoints_on_following_step
= 0;
484 int handling_longjmp
= 0; /* FIXME */
485 struct breakpoint
*step_resume_breakpoint
= NULL
;
488 old_cleanups
= make_cleanup (delete_breakpoint_current_contents
,
489 &step_resume_breakpoint
);
490 sal
= find_pc_line(prev_pc
, 0);
491 current_line
= sal
.line
;
493 /* Are we stepping? */
494 #define CURRENTLY_STEPPING() ((step_resume_breakpoint == NULL \
495 && !handling_longjmp \
498 || bpstat_should_step ())
502 /* Clean up saved state that will become invalid. */
503 flush_cached_frames ();
504 registers_changed ();
506 pid
= target_wait (&w
);
508 #ifdef SIGTRAP_STOP_AFTER_LOAD
510 /* Somebody called load(2), and it gave us a "trap signal after load".
511 Ignore it gracefully. */
513 SIGTRAP_STOP_AFTER_LOAD (w
);
516 /* See if the process still exists; clean up if it doesn't. */
519 target_terminal_ours (); /* Must do this before mourn anyway */
521 printf_filtered ("\nProgram exited with code 0%o.\n",
522 (unsigned int)WEXITSTATUS (w
));
525 printf_filtered ("\nProgram exited normally.\n");
527 target_mourn_inferior ();
528 #ifdef NO_SINGLE_STEP
531 stop_print_frame
= 0;
534 else if (!WIFSTOPPED (w
))
538 stop_print_frame
= 0;
539 stop_signal
= WTERMSIG (w
);
540 target_terminal_ours (); /* Must do this before mourn anyway */
541 target_kill (); /* kill mourns as well */
542 #ifdef PRINT_RANDOM_SIGNAL
543 printf_filtered ("\nProgram terminated: ");
544 PRINT_RANDOM_SIGNAL (stop_signal
);
546 printf_filtered ("\nProgram terminated with signal ");
547 signame
= strsigno (stop_signal
);
549 printf_filtered ("%d", stop_signal
);
551 /* Do we need to print the number in addition to the name? */
552 printf_filtered ("%s (%d)", signame
, stop_signal
);
553 printf_filtered (", %s\n", safe_strsignal (stop_signal
));
555 printf_filtered ("The program no longer exists.\n");
557 #ifdef NO_SINGLE_STEP
563 if (pid
!= inferior_pid
)
567 if (!in_thread_list (pid
))
569 fprintf (stderr
, "[New %s]\n", target_pid_to_str (pid
));
572 target_resume (pid
, 0, 0);
577 stop_signal
= WSTOPSIG (w
);
579 if (stop_signal
>= NSIG
|| signal_print
[stop_signal
])
584 target_terminal_ours_for_output ();
585 printf_filtered ("\nProgram received signal ");
586 signame
= strsigno (stop_signal
);
588 printf_filtered ("%d", stop_signal
);
590 printf_filtered ("%s (%d)", signame
, stop_signal
);
591 printf_filtered (", %s\n", safe_strsignal (stop_signal
));
596 if (stop_signal
>= NSIG
|| signal_stop
[stop_signal
])
599 printf_filtered ("[Switching to %s]\n", target_pid_to_str (pid
));
601 flush_cached_frames ();
602 registers_changed ();
604 if (step_resume_breakpoint
)
606 delete_breakpoint (step_resume_breakpoint
);
607 step_resume_breakpoint
= NULL
;
611 prev_func_name
= NULL
;
612 step_range_start
= 0;
614 step_frame_address
= 0;
615 handling_longjmp
= 0;
621 target_terminal_inferior ();
623 /* Clear the signal if it should not be passed. */
624 if (signal_program
[stop_signal
] == 0)
627 target_resume (pid
, 0, stop_signal
);
633 #ifdef NO_SINGLE_STEP
635 single_step (0); /* This actually cleans up the ss */
636 #endif /* NO_SINGLE_STEP */
638 /* If PC is pointing at a nullified instruction, then step beyond it so that
639 the user won't be confused when GDB appears to be ready to execute it. */
641 if (INSTRUCTION_NULLIFIED
)
647 stop_pc
= read_pc ();
648 set_current_frame ( create_new_frame (read_fp (), stop_pc
));
650 stop_frame_address
= FRAME_FP (get_current_frame ());
651 stop_sp
= read_sp ();
655 /* Don't care about return value; stop_func_start and stop_func_name
656 will both be 0 if it doesn't work. */
657 find_pc_partial_function (stop_pc
, &stop_func_name
, &stop_func_start
,
659 stop_func_start
+= FUNCTION_START_OFFSET
;
661 bpstat_clear (&stop_bpstat
);
663 stop_stack_dummy
= 0;
664 stop_print_frame
= 1;
666 stopped_by_random_signal
= 0;
667 breakpoints_failed
= 0;
669 /* Look at the cause of the stop, and decide what to do.
670 The alternatives are:
671 1) break; to really stop and return to the debugger,
672 2) drop through to start up again
673 (set another_trap to 1 to single step once)
674 3) set random_signal to 1, and the decision between 1 and 2
675 will be made according to the signal handling tables. */
677 stop_signal
= WSTOPSIG (w
);
679 /* First, distinguish signals caused by the debugger from signals
680 that have to do with the program's own actions.
681 Note that breakpoint insns may cause SIGTRAP or SIGILL
682 or SIGEMT, depending on the operating system version.
683 Here we detect when a SIGILL or SIGEMT is really a breakpoint
684 and change it to SIGTRAP. */
686 if (stop_signal
== SIGTRAP
687 || (breakpoints_inserted
&&
688 (stop_signal
== SIGILL
690 || stop_signal
== SIGEMT
693 || stop_soon_quietly
)
695 if (stop_signal
== SIGTRAP
&& stop_after_trap
)
697 stop_print_frame
= 0;
700 if (stop_soon_quietly
)
703 /* Don't even think about breakpoints
704 if just proceeded over a breakpoint.
706 However, if we are trying to proceed over a breakpoint
707 and end up in sigtramp, then step_resume_breakpoint
708 will be set and we should check whether we've hit the
710 if (stop_signal
== SIGTRAP
&& trap_expected
711 && step_resume_breakpoint
== NULL
)
712 bpstat_clear (&stop_bpstat
);
715 /* See if there is a breakpoint at the current PC. */
716 stop_bpstat
= bpstat_stop_status
717 (&stop_pc
, stop_frame_address
,
718 #if DECR_PC_AFTER_BREAK
719 /* Notice the case of stepping through a jump
720 that lands just after a breakpoint.
721 Don't confuse that with hitting the breakpoint.
722 What we check for is that 1) stepping is going on
723 and 2) the pc before the last insn does not match
724 the address of the breakpoint before the current pc. */
725 (prev_pc
!= stop_pc
- DECR_PC_AFTER_BREAK
726 && CURRENTLY_STEPPING ())
727 #else /* DECR_PC_AFTER_BREAK zero */
729 #endif /* DECR_PC_AFTER_BREAK zero */
731 /* Following in case break condition called a
733 stop_print_frame
= 1;
736 if (stop_signal
== SIGTRAP
)
738 = !(bpstat_explains_signal (stop_bpstat
)
740 #ifndef CALL_DUMMY_BREAKPOINT_OFFSET
741 || PC_IN_CALL_DUMMY (stop_pc
, stop_sp
, stop_frame_address
)
742 #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */
743 || (step_range_end
&& step_resume_breakpoint
== NULL
));
747 = !(bpstat_explains_signal (stop_bpstat
)
748 /* End of a stack dummy. Some systems (e.g. Sony
749 news) give another signal besides SIGTRAP,
750 so check here as well as above. */
751 #ifndef CALL_DUMMY_BREAKPOINT_OFFSET
752 || PC_IN_CALL_DUMMY (stop_pc
, stop_sp
, stop_frame_address
)
753 #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */
756 stop_signal
= SIGTRAP
;
762 /* For the program's own signals, act according to
763 the signal handling tables. */
767 /* Signal not for debugging purposes. */
770 stopped_by_random_signal
= 1;
772 if (stop_signal
>= NSIG
773 || signal_print
[stop_signal
])
777 target_terminal_ours_for_output ();
778 #ifdef PRINT_RANDOM_SIGNAL
779 PRINT_RANDOM_SIGNAL (stop_signal
);
781 printf_filtered ("\nProgram received signal ");
782 signame
= strsigno (stop_signal
);
784 printf_filtered ("%d", stop_signal
);
786 /* Do we need to print the number as well as the name? */
787 printf_filtered ("%s (%d)", signame
, stop_signal
);
788 printf_filtered (", %s\n", safe_strsignal (stop_signal
));
789 #endif /* PRINT_RANDOM_SIGNAL */
792 if (stop_signal
>= NSIG
793 || signal_stop
[stop_signal
])
795 /* If not going to stop, give terminal back
796 if we took it away. */
798 target_terminal_inferior ();
800 /* Clear the signal if it should not be passed. */
801 if (signal_program
[stop_signal
] == 0)
804 /* I'm not sure whether this needs to be check_sigtramp2 or
805 whether it could/should be keep_going. */
806 goto check_sigtramp2
;
809 /* Handle cases caused by hitting a breakpoint. */
811 CORE_ADDR jmp_buf_pc
;
812 struct bpstat_what what
;
814 what
= bpstat_what (stop_bpstat
);
818 stop_stack_dummy
= 1;
820 trap_expected_after_continue
= 1;
824 switch (what
.main_action
)
826 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
827 /* If we hit the breakpoint at longjmp, disable it for the
828 duration of this command. Then, install a temporary
829 breakpoint at the target of the jmp_buf. */
830 disable_longjmp_breakpoint();
831 remove_breakpoints ();
832 breakpoints_inserted
= 0;
833 if (!GET_LONGJMP_TARGET(&jmp_buf_pc
)) goto keep_going
;
835 /* Need to blow away step-resume breakpoint, as it
836 interferes with us */
837 if (step_resume_breakpoint
!= NULL
)
839 delete_breakpoint (step_resume_breakpoint
);
840 step_resume_breakpoint
= NULL
;
841 what
.step_resume
= 0;
845 /* FIXME - Need to implement nested temporary breakpoints */
846 if (step_over_calls
> 0)
847 set_longjmp_resume_breakpoint(jmp_buf_pc
,
848 get_current_frame());
851 set_longjmp_resume_breakpoint(jmp_buf_pc
, NULL
);
852 handling_longjmp
= 1; /* FIXME */
855 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
856 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE
:
857 remove_breakpoints ();
858 breakpoints_inserted
= 0;
860 /* FIXME - Need to implement nested temporary breakpoints */
862 && (stop_frame_address
863 INNER_THAN step_frame_address
))
869 disable_longjmp_breakpoint();
870 handling_longjmp
= 0; /* FIXME */
871 if (what
.main_action
== BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
)
873 /* else fallthrough */
875 case BPSTAT_WHAT_SINGLE
:
876 if (breakpoints_inserted
)
877 remove_breakpoints ();
878 breakpoints_inserted
= 0;
880 /* Still need to check other stuff, at least the case
881 where we are stepping and step out of the right range. */
884 case BPSTAT_WHAT_STOP_NOISY
:
885 stop_print_frame
= 1;
886 /* We are about to nuke the step_resume_breakpoint via the
887 cleanup chain, so no need to worry about it here. */
890 case BPSTAT_WHAT_STOP_SILENT
:
891 stop_print_frame
= 0;
892 /* We are about to nuke the step_resume_breakpoint via the
893 cleanup chain, so no need to worry about it here. */
896 case BPSTAT_WHAT_KEEP_CHECKING
:
900 if (what
.step_resume
)
902 delete_breakpoint (step_resume_breakpoint
);
903 step_resume_breakpoint
= NULL
;
905 /* If were waiting for a trap, hitting the step_resume_break
906 doesn't count as getting it. */
912 /* We come here if we hit a breakpoint but should not
913 stop for it. Possibly we also were stepping
914 and should stop for that. So fall through and
915 test for stepping. But, if not stepping,
918 #ifndef CALL_DUMMY_BREAKPOINT_OFFSET
919 /* This is the old way of detecting the end of the stack dummy.
920 An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets
921 handled above. As soon as we can test it on all of them, all
922 architectures should define it. */
924 /* If this is the breakpoint at the end of a stack dummy,
925 just stop silently, unless the user was doing an si/ni, in which
926 case she'd better know what she's doing. */
928 if (PC_IN_CALL_DUMMY (stop_pc
, stop_sp
, stop_frame_address
)
931 stop_print_frame
= 0;
932 stop_stack_dummy
= 1;
934 trap_expected_after_continue
= 1;
938 #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */
940 if (step_resume_breakpoint
)
941 /* Having a step-resume breakpoint overrides anything
942 else having to do with stepping commands until
943 that breakpoint is reached. */
944 /* I suspect this could/should be keep_going, because if the
945 check_sigtramp2 check succeeds, then it will put in another
946 step_resume_breakpoint, and we aren't (yet) prepared to nest
948 goto check_sigtramp2
;
950 if (step_range_end
== 0)
951 /* Likewise if we aren't even stepping. */
952 /* I'm not sure whether this needs to be check_sigtramp2 or
953 whether it could/should be keep_going. */
954 goto check_sigtramp2
;
956 /* If stepping through a line, keep going if still within it. */
957 if (stop_pc
>= step_range_start
958 && stop_pc
< step_range_end
959 /* The step range might include the start of the
960 function, so if we are at the start of the
961 step range and either the stack or frame pointers
962 just changed, we've stepped outside */
963 && !(stop_pc
== step_range_start
964 && stop_frame_address
965 && (stop_sp INNER_THAN prev_sp
966 || stop_frame_address
!= step_frame_address
)))
968 /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal.
969 So definately need to check for sigtramp here. */
970 goto check_sigtramp2
;
973 /* We stepped out of the stepping range. See if that was due
974 to a subroutine call that we should proceed to the end of. */
976 /* Did we just take a signal? */
977 if (IN_SIGTRAMP (stop_pc
, stop_func_name
)
978 && !IN_SIGTRAMP (prev_pc
, prev_func_name
))
980 /* This code is needed at least in the following case:
981 The user types "next" and then a signal arrives (before
982 the "next" is done). */
983 /* We've just taken a signal; go until we are back to
984 the point where we took it and one more. */
986 struct symtab_and_line sr_sal
;
989 sr_sal
.symtab
= NULL
;
991 step_resume_breakpoint
=
992 set_momentary_breakpoint (sr_sal
, get_current_frame (),
994 if (breakpoints_inserted
)
995 insert_breakpoints ();
998 /* If this is stepi or nexti, make sure that the stepping range
999 gets us past that instruction. */
1000 if (step_range_end
== 1)
1001 /* FIXME: Does this run afoul of the code below which, if
1002 we step into the middle of a line, resets the stepping
1004 step_range_end
= (step_range_start
= prev_pc
) + 1;
1006 remove_breakpoints_on_following_step
= 1;
1010 if (stop_func_start
)
1012 /* Do this after the IN_SIGTRAMP check; it might give
1014 prologue_pc
= stop_func_start
;
1015 SKIP_PROLOGUE (prologue_pc
);
1018 /* ==> See comments at top of file on this algorithm. <==*/
1020 if ((stop_pc
< stop_func_start
1021 || stop_pc
>= stop_func_end
1022 || stop_pc
== stop_func_start
1023 || IN_SOLIB_TRAMPOLINE (stop_pc
, stop_func_name
))
1024 && (stop_func_start
!= prev_func_start
1025 || prologue_pc
!= stop_func_start
1026 || stop_sp
!= prev_sp
))
1028 /* It's a subroutine call. */
1030 if (step_over_calls
== 0)
1032 /* I presume that step_over_calls is only 0 when we're
1033 supposed to be stepping at the assembly language level
1034 ("stepi"). Just stop. */
1039 if (step_over_calls
> 0)
1040 /* We're doing a "next". */
1041 goto step_over_function
;
1043 /* If we are in a function call trampoline (a stub between
1044 the calling routine and the real function), locate the real
1045 function. That's what tells us (a) whether we want to step
1046 into it at all, and (b) what prologue we want to run to
1047 the end of, if we do step into it. */
1048 tmp
= SKIP_TRAMPOLINE_CODE (stop_pc
);
1050 stop_func_start
= tmp
;
1052 /* If we have line number information for the function we
1053 are thinking of stepping into, step into it.
1055 If there are several symtabs at that PC (e.g. with include
1056 files), just want to know whether *any* of them have line
1057 numbers. find_pc_line handles this. */
1059 struct symtab_and_line tmp_sal
;
1061 tmp_sal
= find_pc_line (stop_func_start
, 0);
1062 if (tmp_sal
.line
!= 0)
1063 goto step_into_function
;
1067 /* A subroutine call has happened. */
1069 /* Set a special breakpoint after the return */
1070 struct symtab_and_line sr_sal
;
1073 (SAVED_PC_AFTER_CALL (get_current_frame ()));
1074 sr_sal
.symtab
= NULL
;
1076 step_resume_breakpoint
=
1077 set_momentary_breakpoint (sr_sal
, get_current_frame (),
1079 if (breakpoints_inserted
)
1080 insert_breakpoints ();
1085 /* Subroutine call with source code we should not step over.
1086 Do step to the first line of code in it. */
1087 SKIP_PROLOGUE (stop_func_start
);
1088 sal
= find_pc_line (stop_func_start
, 0);
1089 /* Use the step_resume_break to step until
1090 the end of the prologue, even if that involves jumps
1091 (as it seems to on the vax under 4.2). */
1092 /* If the prologue ends in the middle of a source line,
1093 continue to the end of that source line.
1094 Otherwise, just go to end of prologue. */
1095 #ifdef PROLOGUE_FIRSTLINE_OVERLAP
1096 /* no, don't either. It skips any code that's
1097 legitimately on the first line. */
1099 if (sal
.end
&& sal
.pc
!= stop_func_start
)
1100 stop_func_start
= sal
.end
;
1103 if (stop_func_start
== stop_pc
)
1105 /* We are already there: stop now. */
1110 /* Put the step-breakpoint there and go until there. */
1112 struct symtab_and_line sr_sal
;
1114 sr_sal
.pc
= stop_func_start
;
1115 sr_sal
.symtab
= NULL
;
1117 /* Do not specify what the fp should be when we stop
1118 since on some machines the prologue
1119 is where the new fp value is established. */
1120 step_resume_breakpoint
=
1121 set_momentary_breakpoint (sr_sal
, NULL
, bp_step_resume
);
1122 if (breakpoints_inserted
)
1123 insert_breakpoints ();
1125 /* And make sure stepping stops right away then. */
1126 step_range_end
= step_range_start
;
1131 /* We've wandered out of the step range (but haven't done a
1132 subroutine call or return). (Is that true? I think we get
1133 here if we did a return and maybe a longjmp). */
1135 sal
= find_pc_line(stop_pc
, 0);
1137 if (step_range_end
== 1)
1139 /* It is stepi or nexti. We always want to stop stepping after
1147 /* We have no line number information. That means to stop
1148 stepping (does this always happen right after one instruction,
1149 when we do "s" in a function with no line numbers,
1150 or can this happen as a result of a return or longjmp?). */
1155 if (stop_pc
== sal
.pc
&& current_line
!= sal
.line
)
1157 /* We are at the start of a different line. So stop. Note that
1158 we don't stop if we step into the middle of a different line.
1159 That is said to make things like for (;;) statements work
1165 /* We aren't done stepping.
1167 Optimize by setting the stepping range to the line.
1168 (We might not be in the original line, but if we entered a
1169 new line in mid-statement, we continue stepping. This makes
1170 things like for(;;) statements work better.) */
1171 step_range_start
= sal
.pc
;
1172 step_range_end
= sal
.end
;
1177 && IN_SIGTRAMP (stop_pc
, stop_func_name
)
1178 && !IN_SIGTRAMP (prev_pc
, prev_func_name
))
1180 /* What has happened here is that we have just stepped the inferior
1181 with a signal (because it is a signal which shouldn't make
1182 us stop), thus stepping into sigtramp.
1184 So we need to set a step_resume_break_address breakpoint
1185 and continue until we hit it, and then step. FIXME: This should
1186 be more enduring than a step_resume breakpoint; we should know
1187 that we will later need to keep going rather than re-hitting
1188 the breakpoint here (see testsuite/gdb.t06/signals.exp where
1189 it says "exceedingly difficult"). */
1190 struct symtab_and_line sr_sal
;
1192 sr_sal
.pc
= prev_pc
;
1193 sr_sal
.symtab
= NULL
;
1195 step_resume_breakpoint
=
1196 set_momentary_breakpoint (sr_sal
, get_current_frame (),
1198 if (breakpoints_inserted
)
1199 insert_breakpoints ();
1201 remove_breakpoints_on_following_step
= 1;
1206 /* Come to this label when you need to resume the inferior.
1207 It's really much cleaner to do a goto than a maze of if-else
1210 /* Save the pc before execution, to compare with pc after stop. */
1211 prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
1212 prev_func_start
= stop_func_start
; /* Ok, since if DECR_PC_AFTER
1213 BREAK is defined, the
1214 original pc would not have
1215 been at the start of a
1217 prev_func_name
= stop_func_name
;
1220 /* If we did not do break;, it means we should keep
1221 running the inferior and not return to debugger. */
1223 if (trap_expected
&& stop_signal
!= SIGTRAP
)
1225 /* We took a signal (which we are supposed to pass through to
1226 the inferior, else we'd have done a break above) and we
1227 haven't yet gotten our trap. Simply continue. */
1228 resume (CURRENTLY_STEPPING (), stop_signal
);
1232 /* Either the trap was not expected, but we are continuing
1233 anyway (the user asked that this signal be passed to the
1236 The signal was SIGTRAP, e.g. it was our signal, but we
1237 decided we should resume from it.
1239 We're going to run this baby now!
1241 Insert breakpoints now, unless we are trying
1242 to one-proceed past a breakpoint. */
1243 /* If we've just finished a special step resume and we don't
1244 want to hit a breakpoint, pull em out. */
1245 if (step_resume_breakpoint
== NULL
&&
1246 remove_breakpoints_on_following_step
)
1248 remove_breakpoints_on_following_step
= 0;
1249 remove_breakpoints ();
1250 breakpoints_inserted
= 0;
1252 else if (!breakpoints_inserted
&&
1253 (step_resume_breakpoint
!= NULL
|| !another_trap
))
1255 breakpoints_failed
= insert_breakpoints ();
1256 if (breakpoints_failed
)
1258 breakpoints_inserted
= 1;
1261 trap_expected
= another_trap
;
1263 if (stop_signal
== SIGTRAP
)
1266 #ifdef SHIFT_INST_REGS
1267 /* I'm not sure when this following segment applies. I do know, now,
1268 that we shouldn't rewrite the regs when we were stopped by a
1269 random signal from the inferior process. */
1270 /* FIXME: Shouldn't this be based on the valid bit of the SXIP?
1271 (this is only used on the 88k). */
1273 if (!bpstat_explains_signal (stop_bpstat
)
1274 && (stop_signal
!= SIGCLD
)
1275 && !stopped_by_random_signal
)
1277 #endif /* SHIFT_INST_REGS */
1279 resume (CURRENTLY_STEPPING (), stop_signal
);
1284 if (target_has_execution
)
1286 /* Assuming the inferior still exists, set these up for next
1287 time, just like we did above if we didn't break out of the
1289 prev_pc
= read_pc ();
1290 prev_func_start
= stop_func_start
;
1291 prev_func_name
= stop_func_name
;
1294 do_cleanups (old_cleanups
);
1297 /* Here to return control to GDB when the inferior stops for real.
1298 Print appropriate messages, remove breakpoints, give terminal our modes.
1300 STOP_PRINT_FRAME nonzero means print the executing frame
1301 (pc, function, args, file, line number and line text).
1302 BREAKPOINTS_FAILED nonzero means stop was due to error
1303 attempting to insert breakpoints. */
1308 /* Make sure that the current_frame's pc is correct. This
1309 is a correction for setting up the frame info before doing
1310 DECR_PC_AFTER_BREAK */
1311 if (target_has_execution
&& get_current_frame())
1312 (get_current_frame ())->pc
= read_pc ();
1314 if (breakpoints_failed
)
1316 target_terminal_ours_for_output ();
1317 print_sys_errmsg ("ptrace", breakpoints_failed
);
1318 printf_filtered ("Stopped; cannot insert breakpoints.\n\
1319 The same program may be running in another process.\n");
1322 if (target_has_execution
&& breakpoints_inserted
)
1323 if (remove_breakpoints ())
1325 target_terminal_ours_for_output ();
1326 printf_filtered ("Cannot remove breakpoints because program is no longer writable.\n\
1327 It might be running in another process.\n\
1328 Further execution is probably impossible.\n");
1331 breakpoints_inserted
= 0;
1333 /* Delete the breakpoint we stopped at, if it wants to be deleted.
1334 Delete any breakpoint that is to be deleted at the next stop. */
1336 breakpoint_auto_delete (stop_bpstat
);
1338 /* If an auto-display called a function and that got a signal,
1339 delete that auto-display to avoid an infinite recursion. */
1341 if (stopped_by_random_signal
)
1342 disable_current_display ();
1344 if (step_multi
&& stop_step
)
1347 target_terminal_ours ();
1349 /* Look up the hook_stop and run it if it exists. */
1351 if (stop_command
->hook
)
1353 catch_errors (hook_stop_stub
, (char *)stop_command
->hook
,
1354 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
1357 if (!target_has_stack
)
1360 /* Select innermost stack frame except on return from a stack dummy routine,
1361 or if the program has exited. Print it without a level number if
1362 we have changed functions or hit a breakpoint. Print source line
1364 if (!stop_stack_dummy
)
1366 select_frame (get_current_frame (), 0);
1368 if (stop_print_frame
)
1372 source_only
= bpstat_print (stop_bpstat
);
1373 source_only
= source_only
||
1375 && step_frame_address
== stop_frame_address
1376 && step_start_function
== find_pc_function (stop_pc
));
1378 print_stack_frame (selected_frame
, -1, source_only
? -1: 1);
1380 /* Display the auto-display expressions. */
1385 /* Save the function value return registers, if we care.
1386 We might be about to restore their previous contents. */
1387 if (proceed_to_finish
)
1388 read_register_bytes (0, stop_registers
, REGISTER_BYTES
);
1390 if (stop_stack_dummy
)
1392 /* Pop the empty frame that contains the stack dummy.
1393 POP_FRAME ends with a setting of the current frame, so we
1394 can use that next. */
1396 select_frame (get_current_frame (), 0);
1401 hook_stop_stub (cmd
)
1404 execute_user_command ((struct cmd_list_element
*)cmd
, 0);
1408 int signal_stop_state (signo
)
1411 return ((signo
>= 0 && signo
< NSIG
) ? signal_stop
[signo
] : 0);
1414 int signal_print_state (signo
)
1417 return ((signo
>= 0 && signo
< NSIG
) ? signal_print
[signo
] : 0);
1420 int signal_pass_state (signo
)
1423 return ((signo
>= 0 && signo
< NSIG
) ? signal_program
[signo
] : 0);
1429 printf_filtered ("Signal\t\tStop\tPrint\tPass to program\tDescription\n");
1433 sig_print_info (number
)
1438 if ((name
= strsigno (number
)) == NULL
)
1439 printf_filtered ("%d\t\t", number
);
1441 printf_filtered ("%s (%d)\t", name
, number
);
1442 printf_filtered ("%s\t", signal_stop
[number
] ? "Yes" : "No");
1443 printf_filtered ("%s\t", signal_print
[number
] ? "Yes" : "No");
1444 printf_filtered ("%s\t\t", signal_program
[number
] ? "Yes" : "No");
1445 printf_filtered ("%s\n", safe_strsignal (number
));
1448 /* Specify how various signals in the inferior should be handled. */
1451 handle_command (args
, from_tty
)
1456 int digits
, wordlen
;
1457 int sigfirst
, signum
, siglast
;
1460 unsigned char *sigs
;
1461 struct cleanup
*old_chain
;
1465 error_no_arg ("signal to handle");
1468 /* Allocate and zero an array of flags for which signals to handle. */
1470 nsigs
= signo_max () + 1;
1471 sigs
= (unsigned char *) alloca (nsigs
);
1472 memset (sigs
, 0, nsigs
);
1474 /* Break the command line up into args. */
1476 argv
= buildargv (args
);
1481 old_chain
= make_cleanup (freeargv
, (char *) argv
);
1483 /* Walk through the args, looking for signal numbers, signal names, and
1484 actions. Signal numbers and signal names may be interspersed with
1485 actions, with the actions being performed for all signals cumulatively
1486 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
1488 while (*argv
!= NULL
)
1490 wordlen
= strlen (*argv
);
1491 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++) {;}
1493 sigfirst
= siglast
= -1;
1495 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
1497 /* Apply action to all signals except those used by the
1498 debugger. Silently skip those. */
1501 siglast
= nsigs
- 1;
1503 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
1505 SET_SIGS (nsigs
, sigs
, signal_stop
);
1506 SET_SIGS (nsigs
, sigs
, signal_print
);
1508 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
1510 UNSET_SIGS (nsigs
, sigs
, signal_program
);
1512 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
1514 SET_SIGS (nsigs
, sigs
, signal_print
);
1516 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
1518 SET_SIGS (nsigs
, sigs
, signal_program
);
1520 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
1522 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
1524 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
1526 SET_SIGS (nsigs
, sigs
, signal_program
);
1528 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
1530 UNSET_SIGS (nsigs
, sigs
, signal_print
);
1531 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
1533 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
1535 UNSET_SIGS (nsigs
, sigs
, signal_program
);
1537 else if (digits
> 0)
1539 sigfirst
= siglast
= atoi (*argv
);
1540 if ((*argv
)[digits
] == '-')
1542 siglast
= atoi ((*argv
) + digits
+ 1);
1544 if (sigfirst
> siglast
)
1546 /* Bet he didn't figure we'd think of this case... */
1551 if (sigfirst
< 0 || sigfirst
>= nsigs
)
1553 error ("Signal %d not in range 0-%d", sigfirst
, nsigs
- 1);
1555 if (siglast
< 0 || siglast
>= nsigs
)
1557 error ("Signal %d not in range 0-%d", siglast
, nsigs
- 1);
1560 else if ((signum
= strtosigno (*argv
)) != 0)
1562 sigfirst
= siglast
= signum
;
1566 /* Not a number and not a recognized flag word => complain. */
1567 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv
);
1570 /* If any signal numbers or symbol names were found, set flags for
1571 which signals to apply actions to. */
1573 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
1579 if (!allsigs
&& !sigs
[signum
])
1581 if (query ("%s is used by the debugger.\nAre you sure you want to change it? ", strsigno (signum
)))
1587 printf ("Not confirmed, unchanged.\n");
1601 target_notice_signals();
1605 /* Show the results. */
1606 sig_print_header ();
1607 for (signum
= 0; signum
< nsigs
; signum
++)
1611 sig_print_info (signum
);
1616 do_cleanups (old_chain
);
1619 /* Print current contents of the tables set by the handle command. */
1622 signals_info (signum_exp
, from_tty
)
1627 sig_print_header ();
1631 /* First see if this is a symbol name. */
1632 i
= strtosigno (signum_exp
);
1635 /* Nope, maybe it's an address which evaluates to a signal
1637 i
= parse_and_eval_address (signum_exp
);
1638 if (i
>= NSIG
|| i
< 0)
1639 error ("Signal number out of bounds.");
1645 printf_filtered ("\n");
1646 for (i
= 0; i
< NSIG
; i
++)
1653 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
1656 /* Save all of the information associated with the inferior<==>gdb
1657 connection. INF_STATUS is a pointer to a "struct inferior_status"
1658 (defined in inferior.h). */
1661 save_inferior_status (inf_status
, restore_stack_info
)
1662 struct inferior_status
*inf_status
;
1663 int restore_stack_info
;
1665 inf_status
->stop_signal
= stop_signal
;
1666 inf_status
->stop_pc
= stop_pc
;
1667 inf_status
->stop_frame_address
= stop_frame_address
;
1668 inf_status
->stop_step
= stop_step
;
1669 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
1670 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
1671 inf_status
->trap_expected
= trap_expected
;
1672 inf_status
->step_range_start
= step_range_start
;
1673 inf_status
->step_range_end
= step_range_end
;
1674 inf_status
->step_frame_address
= step_frame_address
;
1675 inf_status
->step_over_calls
= step_over_calls
;
1676 inf_status
->stop_after_trap
= stop_after_trap
;
1677 inf_status
->stop_soon_quietly
= stop_soon_quietly
;
1678 /* Save original bpstat chain here; replace it with copy of chain.
1679 If caller's caller is walking the chain, they'll be happier if we
1680 hand them back the original chain when restore_i_s is called. */
1681 inf_status
->stop_bpstat
= stop_bpstat
;
1682 stop_bpstat
= bpstat_copy (stop_bpstat
);
1683 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
1684 inf_status
->restore_stack_info
= restore_stack_info
;
1685 inf_status
->proceed_to_finish
= proceed_to_finish
;
1687 memcpy (inf_status
->stop_registers
, stop_registers
, REGISTER_BYTES
);
1689 read_register_bytes (0, inf_status
->registers
, REGISTER_BYTES
);
1691 record_selected_frame (&(inf_status
->selected_frame_address
),
1692 &(inf_status
->selected_level
));
1696 struct restore_selected_frame_args
{
1697 FRAME_ADDR frame_address
;
1701 static int restore_selected_frame
PARAMS ((char *));
1703 /* Restore the selected frame. args is really a struct
1704 restore_selected_frame_args * (declared as char * for catch_errors)
1705 telling us what frame to restore. Returns 1 for success, or 0 for
1706 failure. An error message will have been printed on error. */
1708 restore_selected_frame (args
)
1711 struct restore_selected_frame_args
*fr
=
1712 (struct restore_selected_frame_args
*) args
;
1714 int level
= fr
->level
;
1716 fid
= find_relative_frame (get_current_frame (), &level
);
1718 /* If inf_status->selected_frame_address is NULL, there was no
1719 previously selected frame. */
1721 FRAME_FP (fid
) != fr
->frame_address
||
1724 warning ("Unable to restore previously selected frame.\n");
1727 select_frame (fid
, fr
->level
);
1732 restore_inferior_status (inf_status
)
1733 struct inferior_status
*inf_status
;
1735 stop_signal
= inf_status
->stop_signal
;
1736 stop_pc
= inf_status
->stop_pc
;
1737 stop_frame_address
= inf_status
->stop_frame_address
;
1738 stop_step
= inf_status
->stop_step
;
1739 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
1740 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
1741 trap_expected
= inf_status
->trap_expected
;
1742 step_range_start
= inf_status
->step_range_start
;
1743 step_range_end
= inf_status
->step_range_end
;
1744 step_frame_address
= inf_status
->step_frame_address
;
1745 step_over_calls
= inf_status
->step_over_calls
;
1746 stop_after_trap
= inf_status
->stop_after_trap
;
1747 stop_soon_quietly
= inf_status
->stop_soon_quietly
;
1748 bpstat_clear (&stop_bpstat
);
1749 stop_bpstat
= inf_status
->stop_bpstat
;
1750 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
1751 proceed_to_finish
= inf_status
->proceed_to_finish
;
1753 memcpy (stop_registers
, inf_status
->stop_registers
, REGISTER_BYTES
);
1755 /* The inferior can be gone if the user types "print exit(0)"
1756 (and perhaps other times). */
1757 if (target_has_execution
)
1758 write_register_bytes (0, inf_status
->registers
, REGISTER_BYTES
);
1760 /* The inferior can be gone if the user types "print exit(0)"
1761 (and perhaps other times). */
1763 /* FIXME: If we are being called after stopping in a function which
1764 is called from gdb, we should not be trying to restore the
1765 selected frame; it just prints a spurious error message (The
1766 message is useful, however, in detecting bugs in gdb (like if gdb
1767 clobbers the stack)). In fact, should we be restoring the
1768 inferior status at all in that case? . */
1770 if (target_has_stack
&& inf_status
->restore_stack_info
)
1772 struct restore_selected_frame_args fr
;
1773 fr
.level
= inf_status
->selected_level
;
1774 fr
.frame_address
= inf_status
->selected_frame_address
;
1775 /* The point of catch_errors is that if the stack is clobbered,
1776 walking the stack might encounter a garbage pointer and error()
1777 trying to dereference it. */
1778 if (catch_errors (restore_selected_frame
, &fr
,
1779 "Unable to restore previously selected frame:\n",
1780 RETURN_MASK_ERROR
) == 0)
1781 /* Error in restoring the selected frame. Select the innermost
1783 select_frame (get_current_frame (), 0);
1789 _initialize_infrun ()
1792 register int numsigs
;
1794 add_info ("signals", signals_info
,
1795 "What debugger does when program gets various signals.\n\
1796 Specify a signal number as argument to print info on that signal only.");
1797 add_info_alias ("handle", "signals", 0);
1799 add_com ("handle", class_run
, handle_command
,
1800 "Specify how to handle a signal.\n\
1801 Args are signal numbers and actions to apply to those signals.\n\
1802 Signal numbers may be numeric (ex. 11) or symbolic (ex. SIGSEGV).\n\
1803 Numeric ranges may be specified with the form LOW-HIGH (ex. 14-21).\n\
1804 The special arg \"all\" is recognized to mean all signals except those\n\
1805 used by the debugger, typically SIGTRAP and SIGINT.\n\
1806 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
1807 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
1808 Stop means reenter debugger if this signal happens (implies print).\n\
1809 Print means print a message if this signal happens.\n\
1810 Pass means let program see this signal; otherwise program doesn't know.\n\
1811 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
1812 Pass and Stop may be combined.");
1814 stop_command
= add_cmd ("stop", class_obscure
, not_just_help_class_command
,
1815 "There is no `stop' command, but you can set a hook on `stop'.\n\
1816 This allows you to set a list of commands to be run each time execution\n\
1817 of the program stops.", &cmdlist
);
1819 numsigs
= signo_max () + 1;
1820 signal_stop
= (unsigned char *)
1821 xmalloc (sizeof (signal_stop
[0]) * numsigs
);
1822 signal_print
= (unsigned char *)
1823 xmalloc (sizeof (signal_print
[0]) * numsigs
);
1824 signal_program
= (unsigned char *)
1825 xmalloc (sizeof (signal_program
[0]) * numsigs
);
1826 for (i
= 0; i
< numsigs
; i
++)
1829 signal_print
[i
] = 1;
1830 signal_program
[i
] = 1;
1833 /* Signals caused by debugger's own actions
1834 should not be given to the program afterwards. */
1835 signal_program
[SIGTRAP
] = 0;
1836 signal_program
[SIGINT
] = 0;
1838 /* Signals that are not errors should not normally enter the debugger. */
1840 signal_stop
[SIGALRM
] = 0;
1841 signal_print
[SIGALRM
] = 0;
1842 #endif /* SIGALRM */
1844 signal_stop
[SIGVTALRM
] = 0;
1845 signal_print
[SIGVTALRM
] = 0;
1846 #endif /* SIGVTALRM */
1848 signal_stop
[SIGPROF
] = 0;
1849 signal_print
[SIGPROF
] = 0;
1850 #endif /* SIGPROF */
1852 signal_stop
[SIGCHLD
] = 0;
1853 signal_print
[SIGCHLD
] = 0;
1854 #endif /* SIGCHLD */
1856 signal_stop
[SIGCLD
] = 0;
1857 signal_print
[SIGCLD
] = 0;
1860 signal_stop
[SIGIO
] = 0;
1861 signal_print
[SIGIO
] = 0;
1864 signal_stop
[SIGURG
] = 0;
1865 signal_print
[SIGURG
] = 0;