1 /* Target-struct-independent code to start (run) and stop an inferior process.
2 Copyright 1986, 1987, 1988, 1989, 1991, 1992, 1993, 1994
3 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
27 #include "breakpoint.h"
37 /* unistd.h is needed to #define X_OK */
44 /* Prototypes for local functions */
46 static void signals_info
PARAMS ((char *, int));
48 static void handle_command
PARAMS ((char *, int));
50 static void sig_print_info
PARAMS ((enum target_signal
));
52 static void sig_print_header
PARAMS ((void));
54 static void resume_cleanups
PARAMS ((int));
56 static int hook_stop_stub
PARAMS ((char *));
58 /* GET_LONGJMP_TARGET returns the PC at which longjmp() will resume the
59 program. It needs to examine the jmp_buf argument and extract the PC
60 from it. The return value is non-zero on success, zero otherwise. */
62 #ifndef GET_LONGJMP_TARGET
63 #define GET_LONGJMP_TARGET(PC_ADDR) 0
67 /* Some machines have trampoline code that sits between function callers
68 and the actual functions themselves. If this machine doesn't have
69 such things, disable their processing. */
71 #ifndef SKIP_TRAMPOLINE_CODE
72 #define SKIP_TRAMPOLINE_CODE(pc) 0
75 /* For SVR4 shared libraries, each call goes through a small piece of
76 trampoline code in the ".plt" section. IN_SOLIB_CALL_TRAMPOLINE evaluates
77 to nonzero if we are current stopped in one of these. */
79 #ifndef IN_SOLIB_CALL_TRAMPOLINE
80 #define IN_SOLIB_CALL_TRAMPOLINE(pc,name) 0
83 /* In some shared library schemes, the return path from a shared library
84 call may need to go through a trampoline too. */
86 #ifndef IN_SOLIB_RETURN_TRAMPOLINE
87 #define IN_SOLIB_RETURN_TRAMPOLINE(pc,name) 0
90 /* On some systems, the PC may be left pointing at an instruction that won't
91 actually be executed. This is usually indicated by a bit in the PSW. If
92 we find ourselves in such a state, then we step the target beyond the
93 nullified instruction before returning control to the user so as to avoid
96 #ifndef INSTRUCTION_NULLIFIED
97 #define INSTRUCTION_NULLIFIED 0
100 /* Tables of how to react to signals; the user sets them. */
102 static unsigned char *signal_stop
;
103 static unsigned char *signal_print
;
104 static unsigned char *signal_program
;
106 #define SET_SIGS(nsigs,sigs,flags) \
108 int signum = (nsigs); \
109 while (signum-- > 0) \
110 if ((sigs)[signum]) \
111 (flags)[signum] = 1; \
114 #define UNSET_SIGS(nsigs,sigs,flags) \
116 int signum = (nsigs); \
117 while (signum-- > 0) \
118 if ((sigs)[signum]) \
119 (flags)[signum] = 0; \
123 /* Command list pointer for the "stop" placeholder. */
125 static struct cmd_list_element
*stop_command
;
127 /* Nonzero if breakpoints are now inserted in the inferior. */
129 static int breakpoints_inserted
;
131 /* Function inferior was in as of last step command. */
133 static struct symbol
*step_start_function
;
135 /* Nonzero if we are expecting a trace trap and should proceed from it. */
137 static int trap_expected
;
140 /* Nonzero if the next time we try to continue the inferior, it will
141 step one instruction and generate a spurious trace trap.
142 This is used to compensate for a bug in HP-UX. */
144 static int trap_expected_after_continue
;
147 /* Nonzero means expecting a trace trap
148 and should stop the inferior and return silently when it happens. */
152 /* Nonzero means expecting a trap and caller will handle it themselves.
153 It is used after attach, due to attaching to a process;
154 when running in the shell before the child program has been exec'd;
155 and when running some kinds of remote stuff (FIXME?). */
157 int stop_soon_quietly
;
159 /* Nonzero if proceed is being used for a "finish" command or a similar
160 situation when stop_registers should be saved. */
162 int proceed_to_finish
;
164 /* Save register contents here when about to pop a stack dummy frame,
165 if-and-only-if proceed_to_finish is set.
166 Thus this contains the return value from the called function (assuming
167 values are returned in a register). */
169 char stop_registers
[REGISTER_BYTES
];
171 /* Nonzero if program stopped due to error trying to insert breakpoints. */
173 static int breakpoints_failed
;
175 /* Nonzero after stop if current stack frame should be printed. */
177 static int stop_print_frame
;
179 #ifdef NO_SINGLE_STEP
180 extern int one_stepped
; /* From machine dependent code */
181 extern void single_step (); /* Same. */
182 #endif /* NO_SINGLE_STEP */
185 /* Things to clean up if we QUIT out of resume (). */
188 resume_cleanups (arg
)
194 /* Resume the inferior, but allow a QUIT. This is useful if the user
195 wants to interrupt some lengthy single-stepping operation
196 (for child processes, the SIGINT goes to the inferior, and so
197 we get a SIGINT random_signal, but for remote debugging and perhaps
198 other targets, that's not true).
200 STEP nonzero if we should step (zero to continue instead).
201 SIG is the signal to give the inferior (zero for none). */
205 enum target_signal sig
;
207 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
210 #ifdef CANNOT_STEP_BREAKPOINT
211 /* Most targets can step a breakpoint instruction, thus executing it
212 normally. But if this one cannot, just continue and we will hit
214 if (step
&& breakpoints_inserted
&& breakpoint_here_p (read_pc ()))
218 #ifdef NO_SINGLE_STEP
220 single_step(sig
); /* Do it the hard way, w/temp breakpoints */
221 step
= 0; /* ...and don't ask hardware to do it. */
225 /* Handle any optimized stores to the inferior NOW... */
226 #ifdef DO_DEFERRED_STORES
230 /* Install inferior's terminal modes. */
231 target_terminal_inferior ();
233 target_resume (-1, step
, sig
);
234 discard_cleanups (old_cleanups
);
238 /* Clear out all variables saying what to do when inferior is continued.
239 First do this, then set the ones you want, then call `proceed'. */
242 clear_proceed_status ()
245 step_range_start
= 0;
247 step_frame_address
= 0;
248 step_over_calls
= -1;
250 stop_soon_quietly
= 0;
251 proceed_to_finish
= 0;
252 breakpoint_proceeded
= 1; /* We're about to proceed... */
254 /* Discard any remaining commands or status from previous stop. */
255 bpstat_clear (&stop_bpstat
);
258 /* Basic routine for continuing the program in various fashions.
260 ADDR is the address to resume at, or -1 for resume where stopped.
261 SIGGNAL is the signal to give it, or 0 for none,
262 or -1 for act according to how it stopped.
263 STEP is nonzero if should trap after one instruction.
264 -1 means return after that and print nothing.
265 You should probably set various step_... variables
266 before calling here, if you are stepping.
268 You should call clear_proceed_status before calling proceed. */
271 proceed (addr
, siggnal
, step
)
273 enum target_signal siggnal
;
279 step_start_function
= find_pc_function (read_pc ());
283 if (addr
== (CORE_ADDR
)-1)
285 /* If there is a breakpoint at the address we will resume at,
286 step one instruction before inserting breakpoints
287 so that we do not stop right away. */
289 if (breakpoint_here_p (read_pc ()))
292 #ifdef STEP_SKIPS_DELAY
293 /* Check breakpoint_here_p first, because breakpoint_here_p is fast
294 (it just checks internal GDB data structures) and STEP_SKIPS_DELAY
295 is slow (it needs to read memory from the target). */
296 if (breakpoint_here_p (read_pc () + 4)
297 && STEP_SKIPS_DELAY (read_pc ()))
299 #endif /* STEP_SKIPS_DELAY */
304 #ifdef PREPARE_TO_PROCEED
305 /* In a multi-threaded task we may select another thread and then continue.
307 In this case the thread that stopped at a breakpoint will immediately
308 cause another stop, if it is not stepped over first. On the other hand,
309 if (ADDR != -1) we only want to single step over the breakpoint if we did
310 switch to another thread.
312 If we are single stepping, don't do any of the above.
313 (Note that in the current implementation single stepping another
314 thread after a breakpoint and then continuing will cause the original
315 breakpoint to be hit again, but you can always continue, so it's not
318 if (! step
&& PREPARE_TO_PROCEED (1) && breakpoint_here_p (read_pc ()))
320 #endif /* PREPARE_TO_PROCEED */
323 if (trap_expected_after_continue
)
325 /* If (step == 0), a trap will be automatically generated after
326 the first instruction is executed. Force step one
327 instruction to clear this condition. This should not occur
328 if step is nonzero, but it is harmless in that case. */
330 trap_expected_after_continue
= 0;
332 #endif /* HP_OS_BUG */
335 /* We will get a trace trap after one instruction.
336 Continue it automatically and insert breakpoints then. */
340 int temp
= insert_breakpoints ();
343 print_sys_errmsg ("ptrace", temp
);
344 error ("Cannot insert breakpoints.\n\
345 The same program may be running in another process.");
347 breakpoints_inserted
= 1;
350 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
351 stop_signal
= siggnal
;
352 /* If this signal should not be seen by program,
353 give it zero. Used for debugging signals. */
354 else if (!signal_program
[stop_signal
])
355 stop_signal
= TARGET_SIGNAL_0
;
357 annotate_starting ();
359 /* Make sure that output from GDB appears before output from the
361 gdb_flush (gdb_stdout
);
363 /* Resume inferior. */
364 resume (oneproc
|| step
|| bpstat_should_step (), stop_signal
);
366 /* Wait for it to stop (if not standalone)
367 and in any case decode why it stopped, and act accordingly. */
369 wait_for_inferior ();
373 /* Record the pc and sp of the program the last time it stopped.
374 These are just used internally by wait_for_inferior, but need
375 to be preserved over calls to it and cleared when the inferior
377 static CORE_ADDR prev_pc
;
378 static CORE_ADDR prev_func_start
;
379 static char *prev_func_name
;
382 /* Start remote-debugging of a machine over a serial link. */
388 init_wait_for_inferior ();
389 clear_proceed_status ();
390 stop_soon_quietly
= 1;
392 wait_for_inferior ();
396 /* Initialize static vars when a new inferior begins. */
399 init_wait_for_inferior ()
401 /* These are meaningless until the first time through wait_for_inferior. */
404 prev_func_name
= NULL
;
407 trap_expected_after_continue
= 0;
409 breakpoints_inserted
= 0;
410 breakpoint_init_inferior ();
412 /* Don't confuse first call to proceed(). */
413 stop_signal
= TARGET_SIGNAL_0
;
417 delete_breakpoint_current_contents (arg
)
420 struct breakpoint
**breakpointp
= (struct breakpoint
**)arg
;
421 if (*breakpointp
!= NULL
)
422 delete_breakpoint (*breakpointp
);
425 /* Wait for control to return from inferior to debugger.
426 If inferior gets a signal, we may decide to start it up again
427 instead of returning. That is why there is a loop in this function.
428 When this function actually returns it means the inferior
429 should be left stopped and GDB should read more commands. */
434 struct cleanup
*old_cleanups
;
435 struct target_waitstatus w
;
438 CORE_ADDR stop_func_start
;
439 CORE_ADDR stop_func_end
;
440 char *stop_func_name
;
441 CORE_ADDR prologue_pc
= 0, tmp
;
442 struct symtab_and_line sal
;
443 int remove_breakpoints_on_following_step
= 0;
445 struct symtab
*current_symtab
;
446 int handling_longjmp
= 0; /* FIXME */
447 struct breakpoint
*step_resume_breakpoint
= NULL
;
448 struct breakpoint
*through_sigtramp_breakpoint
= NULL
;
450 int update_step_sp
= 0;
452 old_cleanups
= make_cleanup (delete_breakpoint_current_contents
,
453 &step_resume_breakpoint
);
454 make_cleanup (delete_breakpoint_current_contents
,
455 &through_sigtramp_breakpoint
);
456 sal
= find_pc_line(prev_pc
, 0);
457 current_line
= sal
.line
;
458 current_symtab
= sal
.symtab
;
460 /* Are we stepping? */
461 #define CURRENTLY_STEPPING() \
462 ((through_sigtramp_breakpoint == NULL \
463 && !handling_longjmp \
464 && ((step_range_end && step_resume_breakpoint == NULL) \
466 || bpstat_should_step ())
470 /* We have to invalidate the registers BEFORE calling target_wait because
471 they can be loaded from the target while in target_wait. This makes
472 remote debugging a bit more efficient for those targets that provide
473 critical registers as part of their normal status mechanism. */
475 registers_changed ();
477 if (target_wait_hook
)
478 pid
= target_wait_hook (-1, &w
);
480 pid
= target_wait (-1, &w
);
482 flush_cached_frames ();
484 /* If it's a new process, add it to the thread database */
486 if (pid
!= inferior_pid
487 && !in_thread_list (pid
))
489 fprintf_unfiltered (gdb_stderr
, "[New %s]\n", target_pid_to_str (pid
));
492 /* We may want to consider not doing a resume here in order to give
493 the user a chance to play with the new thread. It might be good
494 to make that a user-settable option. */
496 /* At this point, all threads are stopped (happens automatically in
497 either the OS or the native code). Therefore we need to continue
498 all threads in order to make progress. */
500 target_resume (-1, 0, TARGET_SIGNAL_0
);
504 stop_signal
= w
.value
.sig
;
506 stop_pc
= read_pc_pid (pid
);
508 if (STOPPED_BY_WATCHPOINT (w
))
510 write_pc (stop_pc
- DECR_PC_AFTER_BREAK
);
512 remove_breakpoints ();
513 target_resume (pid
, 1, TARGET_SIGNAL_0
); /* Single step */
515 if (target_wait_hook
)
516 target_wait_hook (pid
, &w
);
518 target_wait (pid
, &w
);
519 insert_breakpoints ();
524 case TARGET_WAITKIND_LOADED
:
525 /* Ignore it gracefully. */
526 if (breakpoints_inserted
)
528 mark_breakpoints_out ();
529 insert_breakpoints ();
531 resume (0, TARGET_SIGNAL_0
);
534 case TARGET_WAITKIND_SPURIOUS
:
535 resume (0, TARGET_SIGNAL_0
);
538 case TARGET_WAITKIND_EXITED
:
539 target_terminal_ours (); /* Must do this before mourn anyway */
540 annotate_exited (w
.value
.integer
);
542 printf_filtered ("\nProgram exited with code 0%o.\n",
543 (unsigned int)w
.value
.integer
);
545 printf_filtered ("\nProgram exited normally.\n");
546 gdb_flush (gdb_stdout
);
547 target_mourn_inferior ();
548 #ifdef NO_SINGLE_STEP
551 stop_print_frame
= 0;
554 case TARGET_WAITKIND_SIGNALLED
:
555 stop_print_frame
= 0;
556 stop_signal
= w
.value
.sig
;
557 target_terminal_ours (); /* Must do this before mourn anyway */
558 annotate_signalled ();
560 /* This looks pretty bogus to me. Doesn't TARGET_WAITKIND_SIGNALLED
561 mean it is already dead? This has been here since GDB 2.8, so
562 perhaps it means rms didn't understand unix waitstatuses?
563 For the moment I'm just kludging around this in remote.c
564 rather than trying to change it here --kingdon, 5 Dec 1994. */
565 target_kill (); /* kill mourns as well */
567 printf_filtered ("\nProgram terminated with signal ");
568 annotate_signal_name ();
569 printf_filtered ("%s", target_signal_to_name (stop_signal
));
570 annotate_signal_name_end ();
571 printf_filtered (", ");
572 annotate_signal_string ();
573 printf_filtered ("%s", target_signal_to_string (stop_signal
));
574 annotate_signal_string_end ();
575 printf_filtered (".\n");
577 printf_filtered ("The program no longer exists.\n");
578 gdb_flush (gdb_stdout
);
579 #ifdef NO_SINGLE_STEP
584 case TARGET_WAITKIND_STOPPED
:
585 /* This is the only case in which we keep going; the above cases
586 end in a continue or goto. */
590 /* See if a thread hit a thread-specific breakpoint that was meant for
591 another thread. If so, then step that thread past the breakpoint,
594 if (stop_signal
== TARGET_SIGNAL_TRAP
595 && breakpoints_inserted
596 && breakpoint_here_p (stop_pc
- DECR_PC_AFTER_BREAK
))
599 if (!breakpoint_thread_match (stop_pc
- DECR_PC_AFTER_BREAK
, pid
))
601 /* Saw a breakpoint, but it was hit by the wrong thread. Just continue. */
602 write_pc (stop_pc
- DECR_PC_AFTER_BREAK
);
604 remove_breakpoints ();
605 target_resume (pid
, 1, TARGET_SIGNAL_0
); /* Single step */
606 /* FIXME: What if a signal arrives instead of the single-step
609 if (target_wait_hook
)
610 target_wait_hook (pid
, &w
);
612 target_wait (pid
, &w
);
613 insert_breakpoints ();
614 target_resume (pid
, 0, TARGET_SIGNAL_0
);
621 /* See if something interesting happened to the non-current thread. If
622 so, then switch to that thread, and eventually give control back to
625 if (pid
!= inferior_pid
)
629 /* If it's a random signal for a non-current thread, notify user
630 if he's expressed an interest. */
633 && signal_print
[stop_signal
])
636 target_terminal_ours_for_output ();
637 printf_filtered ("\nProgram received signal %s, %s.\n",
638 target_signal_to_name (stop_signal
),
639 target_signal_to_string (stop_signal
));
640 gdb_flush (gdb_stdout
);
643 /* If it's not SIGTRAP and not a signal we want to stop for, then
644 continue the thread. */
646 if (stop_signal
!= TARGET_SIGNAL_TRAP
647 && !signal_stop
[stop_signal
])
650 target_terminal_inferior ();
652 /* Clear the signal if it should not be passed. */
653 if (signal_program
[stop_signal
] == 0)
654 stop_signal
= TARGET_SIGNAL_0
;
656 target_resume (pid
, 0, stop_signal
);
660 /* It's a SIGTRAP or a signal we're interested in. Switch threads,
661 and fall into the rest of wait_for_inferior(). */
664 printf_filtered ("[Switching to %s]\n", target_pid_to_str (pid
));
666 flush_cached_frames ();
668 if (step_resume_breakpoint
)
670 delete_breakpoint (step_resume_breakpoint
);
671 step_resume_breakpoint
= NULL
;
674 /* Not sure whether we need to blow this away too,
675 but probably it is like the step-resume
677 if (through_sigtramp_breakpoint
)
679 delete_breakpoint (through_sigtramp_breakpoint
);
680 through_sigtramp_breakpoint
= NULL
;
683 prev_func_name
= NULL
;
684 step_range_start
= 0;
686 step_frame_address
= 0;
687 handling_longjmp
= 0;
691 #ifdef NO_SINGLE_STEP
693 single_step (0); /* This actually cleans up the ss */
694 #endif /* NO_SINGLE_STEP */
696 /* If PC is pointing at a nullified instruction, then step beyond
697 it so that the user won't be confused when GDB appears to be ready
700 if (INSTRUCTION_NULLIFIED
)
708 /* Don't care about return value; stop_func_start and stop_func_name
709 will both be 0 if it doesn't work. */
710 find_pc_partial_function (stop_pc
, &stop_func_name
, &stop_func_start
,
712 stop_func_start
+= FUNCTION_START_OFFSET
;
714 bpstat_clear (&stop_bpstat
);
716 stop_stack_dummy
= 0;
717 stop_print_frame
= 1;
719 stopped_by_random_signal
= 0;
720 breakpoints_failed
= 0;
722 /* Look at the cause of the stop, and decide what to do.
723 The alternatives are:
724 1) break; to really stop and return to the debugger,
725 2) drop through to start up again
726 (set another_trap to 1 to single step once)
727 3) set random_signal to 1, and the decision between 1 and 2
728 will be made according to the signal handling tables. */
730 /* First, distinguish signals caused by the debugger from signals
731 that have to do with the program's own actions.
732 Note that breakpoint insns may cause SIGTRAP or SIGILL
733 or SIGEMT, depending on the operating system version.
734 Here we detect when a SIGILL or SIGEMT is really a breakpoint
735 and change it to SIGTRAP. */
737 if (stop_signal
== TARGET_SIGNAL_TRAP
738 || (breakpoints_inserted
&&
739 (stop_signal
== TARGET_SIGNAL_ILL
740 || stop_signal
== TARGET_SIGNAL_EMT
742 || stop_soon_quietly
)
744 if (stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
746 stop_print_frame
= 0;
749 if (stop_soon_quietly
)
752 /* Don't even think about breakpoints
753 if just proceeded over a breakpoint.
755 However, if we are trying to proceed over a breakpoint
756 and end up in sigtramp, then through_sigtramp_breakpoint
757 will be set and we should check whether we've hit the
759 if (stop_signal
== TARGET_SIGNAL_TRAP
&& trap_expected
760 && through_sigtramp_breakpoint
== NULL
)
761 bpstat_clear (&stop_bpstat
);
764 /* See if there is a breakpoint at the current PC. */
765 stop_bpstat
= bpstat_stop_status
767 #if DECR_PC_AFTER_BREAK
768 /* Notice the case of stepping through a jump
769 that lands just after a breakpoint.
770 Don't confuse that with hitting the breakpoint.
771 What we check for is that 1) stepping is going on
772 and 2) the pc before the last insn does not match
773 the address of the breakpoint before the current pc. */
774 (prev_pc
!= stop_pc
- DECR_PC_AFTER_BREAK
775 && CURRENTLY_STEPPING ())
776 #else /* DECR_PC_AFTER_BREAK zero */
778 #endif /* DECR_PC_AFTER_BREAK zero */
780 /* Following in case break condition called a
782 stop_print_frame
= 1;
785 if (stop_signal
== TARGET_SIGNAL_TRAP
)
787 = !(bpstat_explains_signal (stop_bpstat
)
789 #ifndef CALL_DUMMY_BREAKPOINT_OFFSET
790 || PC_IN_CALL_DUMMY (stop_pc
, read_sp (),
791 FRAME_FP (get_current_frame ()))
792 #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */
793 || (step_range_end
&& step_resume_breakpoint
== NULL
));
797 = !(bpstat_explains_signal (stop_bpstat
)
798 /* End of a stack dummy. Some systems (e.g. Sony
799 news) give another signal besides SIGTRAP,
800 so check here as well as above. */
801 #ifndef CALL_DUMMY_BREAKPOINT_OFFSET
802 || PC_IN_CALL_DUMMY (stop_pc
, read_sp (),
803 FRAME_FP (get_current_frame ()))
804 #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */
807 stop_signal
= TARGET_SIGNAL_TRAP
;
813 /* For the program's own signals, act according to
814 the signal handling tables. */
818 /* Signal not for debugging purposes. */
821 stopped_by_random_signal
= 1;
823 if (signal_print
[stop_signal
])
826 target_terminal_ours_for_output ();
828 printf_filtered ("\nProgram received signal ");
829 annotate_signal_name ();
830 printf_filtered ("%s", target_signal_to_name (stop_signal
));
831 annotate_signal_name_end ();
832 printf_filtered (", ");
833 annotate_signal_string ();
834 printf_filtered ("%s", target_signal_to_string (stop_signal
));
835 annotate_signal_string_end ();
836 printf_filtered (".\n");
837 gdb_flush (gdb_stdout
);
839 if (signal_stop
[stop_signal
])
841 /* If not going to stop, give terminal back
842 if we took it away. */
844 target_terminal_inferior ();
846 /* Clear the signal if it should not be passed. */
847 if (signal_program
[stop_signal
] == 0)
848 stop_signal
= TARGET_SIGNAL_0
;
850 /* I'm not sure whether this needs to be check_sigtramp2 or
851 whether it could/should be keep_going. */
852 goto check_sigtramp2
;
855 /* Handle cases caused by hitting a breakpoint. */
857 CORE_ADDR jmp_buf_pc
;
858 struct bpstat_what what
;
860 what
= bpstat_what (stop_bpstat
);
864 stop_stack_dummy
= 1;
866 trap_expected_after_continue
= 1;
870 switch (what
.main_action
)
872 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
873 /* If we hit the breakpoint at longjmp, disable it for the
874 duration of this command. Then, install a temporary
875 breakpoint at the target of the jmp_buf. */
876 disable_longjmp_breakpoint();
877 remove_breakpoints ();
878 breakpoints_inserted
= 0;
879 if (!GET_LONGJMP_TARGET(&jmp_buf_pc
)) goto keep_going
;
881 /* Need to blow away step-resume breakpoint, as it
882 interferes with us */
883 if (step_resume_breakpoint
!= NULL
)
885 delete_breakpoint (step_resume_breakpoint
);
886 step_resume_breakpoint
= NULL
;
888 /* Not sure whether we need to blow this away too, but probably
889 it is like the step-resume breakpoint. */
890 if (through_sigtramp_breakpoint
!= NULL
)
892 delete_breakpoint (through_sigtramp_breakpoint
);
893 through_sigtramp_breakpoint
= NULL
;
897 /* FIXME - Need to implement nested temporary breakpoints */
898 if (step_over_calls
> 0)
899 set_longjmp_resume_breakpoint(jmp_buf_pc
,
900 get_current_frame());
903 set_longjmp_resume_breakpoint(jmp_buf_pc
, NULL
);
904 handling_longjmp
= 1; /* FIXME */
907 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
908 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE
:
909 remove_breakpoints ();
910 breakpoints_inserted
= 0;
912 /* FIXME - Need to implement nested temporary breakpoints */
914 && (FRAME_FP (get_current_frame ())
915 INNER_THAN step_frame_address
))
921 disable_longjmp_breakpoint();
922 handling_longjmp
= 0; /* FIXME */
923 if (what
.main_action
== BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
)
925 /* else fallthrough */
927 case BPSTAT_WHAT_SINGLE
:
928 if (breakpoints_inserted
)
929 remove_breakpoints ();
930 breakpoints_inserted
= 0;
932 /* Still need to check other stuff, at least the case
933 where we are stepping and step out of the right range. */
936 case BPSTAT_WHAT_STOP_NOISY
:
937 stop_print_frame
= 1;
939 /* We are about to nuke the step_resume_breakpoint and
940 through_sigtramp_breakpoint via the cleanup chain, so
941 no need to worry about it here. */
945 case BPSTAT_WHAT_STOP_SILENT
:
946 stop_print_frame
= 0;
948 /* We are about to nuke the step_resume_breakpoint and
949 through_sigtramp_breakpoint via the cleanup chain, so
950 no need to worry about it here. */
954 case BPSTAT_WHAT_STEP_RESUME
:
955 delete_breakpoint (step_resume_breakpoint
);
956 step_resume_breakpoint
= NULL
;
959 case BPSTAT_WHAT_THROUGH_SIGTRAMP
:
960 if (through_sigtramp_breakpoint
)
961 delete_breakpoint (through_sigtramp_breakpoint
);
962 through_sigtramp_breakpoint
= NULL
;
964 /* If were waiting for a trap, hitting the step_resume_break
965 doesn't count as getting it. */
970 case BPSTAT_WHAT_LAST
:
971 /* Not a real code, but listed here to shut up gcc -Wall. */
973 case BPSTAT_WHAT_KEEP_CHECKING
:
978 /* We come here if we hit a breakpoint but should not
979 stop for it. Possibly we also were stepping
980 and should stop for that. So fall through and
981 test for stepping. But, if not stepping,
984 #ifndef CALL_DUMMY_BREAKPOINT_OFFSET
985 /* This is the old way of detecting the end of the stack dummy.
986 An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets
987 handled above. As soon as we can test it on all of them, all
988 architectures should define it. */
990 /* If this is the breakpoint at the end of a stack dummy,
991 just stop silently, unless the user was doing an si/ni, in which
992 case she'd better know what she's doing. */
994 if (PC_IN_CALL_DUMMY (stop_pc
, read_sp (), FRAME_FP (get_current_frame ()))
997 stop_print_frame
= 0;
998 stop_stack_dummy
= 1;
1000 trap_expected_after_continue
= 1;
1004 #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */
1006 if (step_resume_breakpoint
)
1007 /* Having a step-resume breakpoint overrides anything
1008 else having to do with stepping commands until
1009 that breakpoint is reached. */
1010 /* I'm not sure whether this needs to be check_sigtramp2 or
1011 whether it could/should be keep_going. */
1012 goto check_sigtramp2
;
1014 if (step_range_end
== 0)
1015 /* Likewise if we aren't even stepping. */
1016 /* I'm not sure whether this needs to be check_sigtramp2 or
1017 whether it could/should be keep_going. */
1018 goto check_sigtramp2
;
1020 /* If stepping through a line, keep going if still within it. */
1021 if (stop_pc
>= step_range_start
1022 && stop_pc
< step_range_end
1023 /* The step range might include the start of the
1024 function, so if we are at the start of the
1025 step range and either the stack or frame pointers
1026 just changed, we've stepped outside */
1027 && !(stop_pc
== step_range_start
1028 && FRAME_FP (get_current_frame ())
1029 && (read_sp () INNER_THAN step_sp
1030 || FRAME_FP (get_current_frame ()) != step_frame_address
)))
1032 /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal.
1033 So definately need to check for sigtramp here. */
1034 goto check_sigtramp2
;
1037 /* We stepped out of the stepping range. */
1039 /* We can't update step_sp every time through the loop, because
1040 reading the stack pointer would slow down stepping too much.
1041 But we can update it every time we leave the step range. */
1044 /* Did we just take a signal? */
1045 if (IN_SIGTRAMP (stop_pc
, stop_func_name
)
1046 && !IN_SIGTRAMP (prev_pc
, prev_func_name
))
1048 /* We've just taken a signal; go until we are back to
1049 the point where we took it and one more. */
1051 /* This code is needed at least in the following case:
1052 The user types "next" and then a signal arrives (before
1053 the "next" is done). */
1055 /* Note that if we are stopped at a breakpoint, then we need
1056 the step_resume breakpoint to override any breakpoints at
1057 the same location, so that we will still step over the
1058 breakpoint even though the signal happened. */
1061 struct symtab_and_line sr_sal
;
1063 sr_sal
.pc
= prev_pc
;
1064 sr_sal
.symtab
= NULL
;
1066 /* We could probably be setting the frame to
1067 step_frame_address; I don't think anyone thought to try it. */
1068 step_resume_breakpoint
=
1069 set_momentary_breakpoint (sr_sal
, NULL
, bp_step_resume
);
1070 if (breakpoints_inserted
)
1071 insert_breakpoints ();
1074 /* If this is stepi or nexti, make sure that the stepping range
1075 gets us past that instruction. */
1076 if (step_range_end
== 1)
1077 /* FIXME: Does this run afoul of the code below which, if
1078 we step into the middle of a line, resets the stepping
1080 step_range_end
= (step_range_start
= prev_pc
) + 1;
1082 remove_breakpoints_on_following_step
= 1;
1087 /* See if we left the step range due to a subroutine call that
1088 we should proceed to the end of. */
1090 if (stop_func_start
)
1094 /* Do this after the IN_SIGTRAMP check; it might give
1096 prologue_pc
= stop_func_start
;
1098 /* Don't skip the prologue if this is assembly source */
1099 s
= find_pc_symtab (stop_pc
);
1100 if (s
&& s
->language
!= language_asm
)
1101 SKIP_PROLOGUE (prologue_pc
);
1104 if ((/* Might be a non-recursive call. If the symbols are missing
1105 enough that stop_func_start == prev_func_start even though
1106 they are really two functions, we will treat some calls as
1108 stop_func_start
!= prev_func_start
1110 /* Might be a recursive call if either we have a prologue
1111 or the call instruction itself saves the PC on the stack. */
1112 || prologue_pc
!= stop_func_start
1113 || read_sp () != step_sp
)
1114 && (/* PC is completely out of bounds of any known objfiles. Treat
1115 like a subroutine call. */
1118 /* If we do a call, we will be at the start of a function... */
1119 || stop_pc
== stop_func_start
1121 /* ...except on the Alpha with -O (and also Irix 5 and
1122 perhaps others), in which we might call the address
1123 after the load of gp. Since prologues don't contain
1124 calls, we can't return to within one, and we don't
1125 jump back into them, so this check is OK. */
1127 || stop_pc
< prologue_pc
1129 /* ...and if it is a leaf function, the prologue might
1130 consist of gp loading only, so the call transfers to
1131 the first instruction after the prologue. */
1132 || (stop_pc
== prologue_pc
1134 /* Distinguish this from the case where we jump back
1135 to the first instruction after the prologue,
1136 within a function. */
1137 && stop_func_start
!= prev_func_start
)
1139 /* If we end up in certain places, it means we did a subroutine
1140 call. I'm not completely sure this is necessary now that we
1141 have the above checks with stop_func_start (and now that
1142 find_pc_partial_function is pickier). */
1143 || IN_SOLIB_CALL_TRAMPOLINE (stop_pc
, stop_func_name
)
1145 /* If none of the above apply, it is a jump within a function,
1146 or a return from a subroutine. The other case is longjmp,
1147 which can no longer happen here as long as the
1148 handling_longjmp stuff is working. */
1151 /* This is experimental code which greatly simplifies the subroutine call
1152 test. I've actually tested on the Alpha, and it works great. -Stu */
1154 if (in_prologue (stop_pc
, NULL
)
1155 || (prev_func_start
!= 0
1156 && stop_func_start
== 0))
1159 /* It's a subroutine call. */
1161 if (step_over_calls
== 0)
1163 /* I presume that step_over_calls is only 0 when we're
1164 supposed to be stepping at the assembly language level
1165 ("stepi"). Just stop. */
1170 if (step_over_calls
> 0)
1171 /* We're doing a "next". */
1172 goto step_over_function
;
1174 /* If we are in a function call trampoline (a stub between
1175 the calling routine and the real function), locate the real
1176 function. That's what tells us (a) whether we want to step
1177 into it at all, and (b) what prologue we want to run to
1178 the end of, if we do step into it. */
1179 tmp
= SKIP_TRAMPOLINE_CODE (stop_pc
);
1181 stop_func_start
= tmp
;
1183 /* If we have line number information for the function we
1184 are thinking of stepping into, step into it.
1186 If there are several symtabs at that PC (e.g. with include
1187 files), just want to know whether *any* of them have line
1188 numbers. find_pc_line handles this. */
1190 struct symtab_and_line tmp_sal
;
1192 tmp_sal
= find_pc_line (stop_func_start
, 0);
1193 if (tmp_sal
.line
!= 0)
1194 goto step_into_function
;
1198 /* A subroutine call has happened. */
1200 /* Set a special breakpoint after the return */
1201 struct symtab_and_line sr_sal
;
1204 (SAVED_PC_AFTER_CALL (get_current_frame ()));
1205 sr_sal
.symtab
= NULL
;
1207 step_resume_breakpoint
=
1208 set_momentary_breakpoint (sr_sal
, get_current_frame (),
1210 step_resume_breakpoint
->frame
= step_frame_address
;
1211 if (breakpoints_inserted
)
1212 insert_breakpoints ();
1217 /* Subroutine call with source code we should not step over.
1218 Do step to the first line of code in it. */
1222 s
= find_pc_symtab (stop_pc
);
1223 if (s
&& s
->language
!= language_asm
)
1224 SKIP_PROLOGUE (stop_func_start
);
1226 sal
= find_pc_line (stop_func_start
, 0);
1227 /* Use the step_resume_break to step until
1228 the end of the prologue, even if that involves jumps
1229 (as it seems to on the vax under 4.2). */
1230 /* If the prologue ends in the middle of a source line,
1231 continue to the end of that source line (if it is still
1232 within the function). Otherwise, just go to end of prologue. */
1233 #ifdef PROLOGUE_FIRSTLINE_OVERLAP
1234 /* no, don't either. It skips any code that's
1235 legitimately on the first line. */
1237 if (sal
.end
&& sal
.pc
!= stop_func_start
&& sal
.end
< stop_func_end
)
1238 stop_func_start
= sal
.end
;
1241 if (stop_func_start
== stop_pc
)
1243 /* We are already there: stop now. */
1248 /* Put the step-breakpoint there and go until there. */
1250 struct symtab_and_line sr_sal
;
1252 sr_sal
.pc
= stop_func_start
;
1253 sr_sal
.symtab
= NULL
;
1255 /* Do not specify what the fp should be when we stop
1256 since on some machines the prologue
1257 is where the new fp value is established. */
1258 step_resume_breakpoint
=
1259 set_momentary_breakpoint (sr_sal
, NULL
, bp_step_resume
);
1260 if (breakpoints_inserted
)
1261 insert_breakpoints ();
1263 /* And make sure stepping stops right away then. */
1264 step_range_end
= step_range_start
;
1269 /* We've wandered out of the step range. */
1271 sal
= find_pc_line(stop_pc
, 0);
1273 if (step_range_end
== 1)
1275 /* It is stepi or nexti. We always want to stop stepping after
1281 /* If we're in the return path from a shared library trampoline,
1282 we want to proceed through the trampoline when stepping. */
1283 if (IN_SOLIB_RETURN_TRAMPOLINE(stop_pc
, stop_func_name
))
1287 /* Determine where this trampoline returns. */
1288 tmp
= SKIP_TRAMPOLINE_CODE (stop_pc
);
1290 /* Only proceed through if we know where it's going. */
1293 /* And put the step-breakpoint there and go until there. */
1294 struct symtab_and_line sr_sal
;
1297 sr_sal
.symtab
= NULL
;
1299 /* Do not specify what the fp should be when we stop
1300 since on some machines the prologue
1301 is where the new fp value is established. */
1302 step_resume_breakpoint
=
1303 set_momentary_breakpoint (sr_sal
, NULL
, bp_step_resume
);
1304 if (breakpoints_inserted
)
1305 insert_breakpoints ();
1307 /* Restart without fiddling with the step ranges or
1315 /* We have no line number information. That means to stop
1316 stepping (does this always happen right after one instruction,
1317 when we do "s" in a function with no line numbers,
1318 or can this happen as a result of a return or longjmp?). */
1323 if (stop_pc
== sal
.pc
1324 && (current_line
!= sal
.line
|| current_symtab
!= sal
.symtab
))
1326 /* We are at the start of a different line. So stop. Note that
1327 we don't stop if we step into the middle of a different line.
1328 That is said to make things like for (;;) statements work
1334 /* We aren't done stepping.
1336 Optimize by setting the stepping range to the line.
1337 (We might not be in the original line, but if we entered a
1338 new line in mid-statement, we continue stepping. This makes
1339 things like for(;;) statements work better.) */
1341 if (stop_func_end
&& sal
.end
>= stop_func_end
)
1343 /* If this is the last line of the function, don't keep stepping
1344 (it would probably step us out of the function).
1345 This is particularly necessary for a one-line function,
1346 in which after skipping the prologue we better stop even though
1347 we will be in mid-line. */
1351 step_range_start
= sal
.pc
;
1352 step_range_end
= sal
.end
;
1357 && IN_SIGTRAMP (stop_pc
, stop_func_name
)
1358 && !IN_SIGTRAMP (prev_pc
, prev_func_name
))
1360 /* What has happened here is that we have just stepped the inferior
1361 with a signal (because it is a signal which shouldn't make
1362 us stop), thus stepping into sigtramp.
1364 So we need to set a step_resume_break_address breakpoint
1365 and continue until we hit it, and then step. FIXME: This should
1366 be more enduring than a step_resume breakpoint; we should know
1367 that we will later need to keep going rather than re-hitting
1368 the breakpoint here (see testsuite/gdb.t06/signals.exp where
1369 it says "exceedingly difficult"). */
1370 struct symtab_and_line sr_sal
;
1372 sr_sal
.pc
= prev_pc
;
1373 sr_sal
.symtab
= NULL
;
1375 /* We perhaps could set the frame if we kept track of what
1376 the frame corresponding to prev_pc was. But we don't,
1378 through_sigtramp_breakpoint
=
1379 set_momentary_breakpoint (sr_sal
, NULL
, bp_through_sigtramp
);
1380 if (breakpoints_inserted
)
1381 insert_breakpoints ();
1383 remove_breakpoints_on_following_step
= 1;
1388 /* Come to this label when you need to resume the inferior.
1389 It's really much cleaner to do a goto than a maze of if-else
1392 /* Save the pc before execution, to compare with pc after stop. */
1393 prev_pc
= read_pc (); /* Might have been DECR_AFTER_BREAK */
1394 prev_func_start
= stop_func_start
; /* Ok, since if DECR_PC_AFTER
1395 BREAK is defined, the
1396 original pc would not have
1397 been at the start of a
1399 prev_func_name
= stop_func_name
;
1402 step_sp
= read_sp ();
1405 /* If we did not do break;, it means we should keep
1406 running the inferior and not return to debugger. */
1408 if (trap_expected
&& stop_signal
!= TARGET_SIGNAL_TRAP
)
1410 /* We took a signal (which we are supposed to pass through to
1411 the inferior, else we'd have done a break above) and we
1412 haven't yet gotten our trap. Simply continue. */
1413 resume (CURRENTLY_STEPPING (), stop_signal
);
1417 /* Either the trap was not expected, but we are continuing
1418 anyway (the user asked that this signal be passed to the
1421 The signal was SIGTRAP, e.g. it was our signal, but we
1422 decided we should resume from it.
1424 We're going to run this baby now!
1426 Insert breakpoints now, unless we are trying
1427 to one-proceed past a breakpoint. */
1428 /* If we've just finished a special step resume and we don't
1429 want to hit a breakpoint, pull em out. */
1430 if (step_resume_breakpoint
== NULL
1431 && through_sigtramp_breakpoint
== NULL
1432 && remove_breakpoints_on_following_step
)
1434 remove_breakpoints_on_following_step
= 0;
1435 remove_breakpoints ();
1436 breakpoints_inserted
= 0;
1438 else if (!breakpoints_inserted
&&
1439 (through_sigtramp_breakpoint
!= NULL
|| !another_trap
))
1441 breakpoints_failed
= insert_breakpoints ();
1442 if (breakpoints_failed
)
1444 breakpoints_inserted
= 1;
1447 trap_expected
= another_trap
;
1449 if (stop_signal
== TARGET_SIGNAL_TRAP
)
1450 stop_signal
= TARGET_SIGNAL_0
;
1452 #ifdef SHIFT_INST_REGS
1453 /* I'm not sure when this following segment applies. I do know, now,
1454 that we shouldn't rewrite the regs when we were stopped by a
1455 random signal from the inferior process. */
1456 /* FIXME: Shouldn't this be based on the valid bit of the SXIP?
1457 (this is only used on the 88k). */
1459 if (!bpstat_explains_signal (stop_bpstat
)
1460 && (stop_signal
!= TARGET_SIGNAL_CHLD
)
1461 && !stopped_by_random_signal
)
1463 #endif /* SHIFT_INST_REGS */
1465 resume (CURRENTLY_STEPPING (), stop_signal
);
1470 if (target_has_execution
)
1472 /* Assuming the inferior still exists, set these up for next
1473 time, just like we did above if we didn't break out of the
1475 prev_pc
= read_pc ();
1476 prev_func_start
= stop_func_start
;
1477 prev_func_name
= stop_func_name
;
1479 do_cleanups (old_cleanups
);
1482 /* Here to return control to GDB when the inferior stops for real.
1483 Print appropriate messages, remove breakpoints, give terminal our modes.
1485 STOP_PRINT_FRAME nonzero means print the executing frame
1486 (pc, function, args, file, line number and line text).
1487 BREAKPOINTS_FAILED nonzero means stop was due to error
1488 attempting to insert breakpoints. */
1493 /* Make sure that the current_frame's pc is correct. This
1494 is a correction for setting up the frame info before doing
1495 DECR_PC_AFTER_BREAK */
1496 if (target_has_execution
&& get_current_frame())
1497 (get_current_frame ())->pc
= read_pc ();
1499 if (breakpoints_failed
)
1501 target_terminal_ours_for_output ();
1502 print_sys_errmsg ("ptrace", breakpoints_failed
);
1503 printf_filtered ("Stopped; cannot insert breakpoints.\n\
1504 The same program may be running in another process.\n");
1507 if (target_has_execution
&& breakpoints_inserted
)
1508 if (remove_breakpoints ())
1510 target_terminal_ours_for_output ();
1511 printf_filtered ("Cannot remove breakpoints because program is no longer writable.\n\
1512 It might be running in another process.\n\
1513 Further execution is probably impossible.\n");
1516 breakpoints_inserted
= 0;
1518 /* Delete the breakpoint we stopped at, if it wants to be deleted.
1519 Delete any breakpoint that is to be deleted at the next stop. */
1521 breakpoint_auto_delete (stop_bpstat
);
1523 /* If an auto-display called a function and that got a signal,
1524 delete that auto-display to avoid an infinite recursion. */
1526 if (stopped_by_random_signal
)
1527 disable_current_display ();
1529 if (step_multi
&& stop_step
)
1532 target_terminal_ours ();
1534 /* Look up the hook_stop and run it if it exists. */
1536 if (stop_command
->hook
)
1538 catch_errors (hook_stop_stub
, (char *)stop_command
->hook
,
1539 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
1542 if (!target_has_stack
)
1545 /* Select innermost stack frame except on return from a stack dummy routine,
1546 or if the program has exited. Print it without a level number if
1547 we have changed functions or hit a breakpoint. Print source line
1549 if (!stop_stack_dummy
)
1551 select_frame (get_current_frame (), 0);
1553 if (stop_print_frame
)
1557 source_only
= bpstat_print (stop_bpstat
);
1558 source_only
= source_only
||
1560 && step_frame_address
== FRAME_FP (get_current_frame ())
1561 && step_start_function
== find_pc_function (stop_pc
));
1563 print_stack_frame (selected_frame
, -1, source_only
? -1: 1);
1565 /* Display the auto-display expressions. */
1570 /* Save the function value return registers, if we care.
1571 We might be about to restore their previous contents. */
1572 if (proceed_to_finish
)
1573 read_register_bytes (0, stop_registers
, REGISTER_BYTES
);
1575 if (stop_stack_dummy
)
1577 /* Pop the empty frame that contains the stack dummy.
1578 POP_FRAME ends with a setting of the current frame, so we
1579 can use that next. */
1581 /* Set stop_pc to what it was before we called the function. Can't rely
1582 on restore_inferior_status because that only gets called if we don't
1583 stop in the called function. */
1584 stop_pc
= read_pc();
1585 select_frame (get_current_frame (), 0);
1588 annotate_stopped ();
1592 hook_stop_stub (cmd
)
1595 execute_user_command ((struct cmd_list_element
*)cmd
, 0);
1599 int signal_stop_state (signo
)
1602 return signal_stop
[signo
];
1605 int signal_print_state (signo
)
1608 return signal_print
[signo
];
1611 int signal_pass_state (signo
)
1614 return signal_program
[signo
];
1621 Signal Stop\tPrint\tPass to program\tDescription\n");
1625 sig_print_info (oursig
)
1626 enum target_signal oursig
;
1628 char *name
= target_signal_to_name (oursig
);
1629 printf_filtered ("%s", name
);
1630 printf_filtered ("%*.*s ", 13 - strlen (name
), 13 - strlen (name
),
1632 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
1633 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
1634 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
1635 printf_filtered ("%s\n", target_signal_to_string (oursig
));
1638 /* Specify how various signals in the inferior should be handled. */
1641 handle_command (args
, from_tty
)
1646 int digits
, wordlen
;
1647 int sigfirst
, signum
, siglast
;
1648 enum target_signal oursig
;
1651 unsigned char *sigs
;
1652 struct cleanup
*old_chain
;
1656 error_no_arg ("signal to handle");
1659 /* Allocate and zero an array of flags for which signals to handle. */
1661 nsigs
= (int)TARGET_SIGNAL_LAST
;
1662 sigs
= (unsigned char *) alloca (nsigs
);
1663 memset (sigs
, 0, nsigs
);
1665 /* Break the command line up into args. */
1667 argv
= buildargv (args
);
1672 old_chain
= make_cleanup (freeargv
, (char *) argv
);
1674 /* Walk through the args, looking for signal oursigs, signal names, and
1675 actions. Signal numbers and signal names may be interspersed with
1676 actions, with the actions being performed for all signals cumulatively
1677 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
1679 while (*argv
!= NULL
)
1681 wordlen
= strlen (*argv
);
1682 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++) {;}
1684 sigfirst
= siglast
= -1;
1686 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
1688 /* Apply action to all signals except those used by the
1689 debugger. Silently skip those. */
1692 siglast
= nsigs
- 1;
1694 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
1696 SET_SIGS (nsigs
, sigs
, signal_stop
);
1697 SET_SIGS (nsigs
, sigs
, signal_print
);
1699 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
1701 UNSET_SIGS (nsigs
, sigs
, signal_program
);
1703 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
1705 SET_SIGS (nsigs
, sigs
, signal_print
);
1707 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
1709 SET_SIGS (nsigs
, sigs
, signal_program
);
1711 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
1713 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
1715 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
1717 SET_SIGS (nsigs
, sigs
, signal_program
);
1719 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
1721 UNSET_SIGS (nsigs
, sigs
, signal_print
);
1722 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
1724 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
1726 UNSET_SIGS (nsigs
, sigs
, signal_program
);
1728 else if (digits
> 0)
1730 /* It is numeric. The numeric signal refers to our own internal
1731 signal numbering from target.h, not to host/target signal number.
1732 This is a feature; users really should be using symbolic names
1733 anyway, and the common ones like SIGHUP, SIGINT, SIGALRM, etc.
1734 will work right anyway. */
1736 sigfirst
= siglast
= (int) target_signal_from_command (atoi (*argv
));
1737 if ((*argv
)[digits
] == '-')
1740 (int) target_signal_from_command (atoi ((*argv
) + digits
+ 1));
1742 if (sigfirst
> siglast
)
1744 /* Bet he didn't figure we'd think of this case... */
1752 oursig
= target_signal_from_name (*argv
);
1753 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
1755 sigfirst
= siglast
= (int)oursig
;
1759 /* Not a number and not a recognized flag word => complain. */
1760 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv
);
1764 /* If any signal numbers or symbol names were found, set flags for
1765 which signals to apply actions to. */
1767 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
1769 switch ((enum target_signal
)signum
)
1771 case TARGET_SIGNAL_TRAP
:
1772 case TARGET_SIGNAL_INT
:
1773 if (!allsigs
&& !sigs
[signum
])
1775 if (query ("%s is used by the debugger.\n\
1776 Are you sure you want to change it? ",
1777 target_signal_to_name
1778 ((enum target_signal
)signum
)))
1784 printf_unfiltered ("Not confirmed, unchanged.\n");
1785 gdb_flush (gdb_stdout
);
1789 case TARGET_SIGNAL_0
:
1790 case TARGET_SIGNAL_DEFAULT
:
1791 case TARGET_SIGNAL_UNKNOWN
:
1792 /* Make sure that "all" doesn't print these. */
1803 target_notice_signals(inferior_pid
);
1807 /* Show the results. */
1808 sig_print_header ();
1809 for (signum
= 0; signum
< nsigs
; signum
++)
1813 sig_print_info (signum
);
1818 do_cleanups (old_chain
);
1821 /* Print current contents of the tables set by the handle command.
1822 It is possible we should just be printing signals actually used
1823 by the current target (but for things to work right when switching
1824 targets, all signals should be in the signal tables). */
1827 signals_info (signum_exp
, from_tty
)
1831 enum target_signal oursig
;
1832 sig_print_header ();
1836 /* First see if this is a symbol name. */
1837 oursig
= target_signal_from_name (signum_exp
);
1838 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
1840 /* No, try numeric. */
1842 target_signal_from_command (parse_and_eval_address (signum_exp
));
1844 sig_print_info (oursig
);
1848 printf_filtered ("\n");
1849 /* These ugly casts brought to you by the native VAX compiler. */
1850 for (oursig
= TARGET_SIGNAL_FIRST
;
1851 (int)oursig
< (int)TARGET_SIGNAL_LAST
;
1852 oursig
= (enum target_signal
)((int)oursig
+ 1))
1856 if (oursig
!= TARGET_SIGNAL_UNKNOWN
1857 && oursig
!= TARGET_SIGNAL_DEFAULT
1858 && oursig
!= TARGET_SIGNAL_0
)
1859 sig_print_info (oursig
);
1862 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
1865 /* Save all of the information associated with the inferior<==>gdb
1866 connection. INF_STATUS is a pointer to a "struct inferior_status"
1867 (defined in inferior.h). */
1870 save_inferior_status (inf_status
, restore_stack_info
)
1871 struct inferior_status
*inf_status
;
1872 int restore_stack_info
;
1874 inf_status
->stop_signal
= stop_signal
;
1875 inf_status
->stop_pc
= stop_pc
;
1876 inf_status
->stop_step
= stop_step
;
1877 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
1878 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
1879 inf_status
->trap_expected
= trap_expected
;
1880 inf_status
->step_range_start
= step_range_start
;
1881 inf_status
->step_range_end
= step_range_end
;
1882 inf_status
->step_frame_address
= step_frame_address
;
1883 inf_status
->step_over_calls
= step_over_calls
;
1884 inf_status
->stop_after_trap
= stop_after_trap
;
1885 inf_status
->stop_soon_quietly
= stop_soon_quietly
;
1886 /* Save original bpstat chain here; replace it with copy of chain.
1887 If caller's caller is walking the chain, they'll be happier if we
1888 hand them back the original chain when restore_i_s is called. */
1889 inf_status
->stop_bpstat
= stop_bpstat
;
1890 stop_bpstat
= bpstat_copy (stop_bpstat
);
1891 inf_status
->breakpoint_proceeded
= breakpoint_proceeded
;
1892 inf_status
->restore_stack_info
= restore_stack_info
;
1893 inf_status
->proceed_to_finish
= proceed_to_finish
;
1895 memcpy (inf_status
->stop_registers
, stop_registers
, REGISTER_BYTES
);
1897 read_register_bytes (0, inf_status
->registers
, REGISTER_BYTES
);
1899 record_selected_frame (&(inf_status
->selected_frame_address
),
1900 &(inf_status
->selected_level
));
1904 struct restore_selected_frame_args
{
1905 CORE_ADDR frame_address
;
1909 static int restore_selected_frame
PARAMS ((char *));
1911 /* Restore the selected frame. args is really a struct
1912 restore_selected_frame_args * (declared as char * for catch_errors)
1913 telling us what frame to restore. Returns 1 for success, or 0 for
1914 failure. An error message will have been printed on error. */
1917 restore_selected_frame (args
)
1920 struct restore_selected_frame_args
*fr
=
1921 (struct restore_selected_frame_args
*) args
;
1922 struct frame_info
*frame
;
1923 int level
= fr
->level
;
1925 frame
= find_relative_frame (get_current_frame (), &level
);
1927 /* If inf_status->selected_frame_address is NULL, there was no
1928 previously selected frame. */
1929 if (frame
== NULL
||
1930 FRAME_FP (frame
) != fr
->frame_address
||
1933 warning ("Unable to restore previously selected frame.\n");
1936 select_frame (frame
, fr
->level
);
1941 restore_inferior_status (inf_status
)
1942 struct inferior_status
*inf_status
;
1944 stop_signal
= inf_status
->stop_signal
;
1945 stop_pc
= inf_status
->stop_pc
;
1946 stop_step
= inf_status
->stop_step
;
1947 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
1948 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
1949 trap_expected
= inf_status
->trap_expected
;
1950 step_range_start
= inf_status
->step_range_start
;
1951 step_range_end
= inf_status
->step_range_end
;
1952 step_frame_address
= inf_status
->step_frame_address
;
1953 step_over_calls
= inf_status
->step_over_calls
;
1954 stop_after_trap
= inf_status
->stop_after_trap
;
1955 stop_soon_quietly
= inf_status
->stop_soon_quietly
;
1956 bpstat_clear (&stop_bpstat
);
1957 stop_bpstat
= inf_status
->stop_bpstat
;
1958 breakpoint_proceeded
= inf_status
->breakpoint_proceeded
;
1959 proceed_to_finish
= inf_status
->proceed_to_finish
;
1961 memcpy (stop_registers
, inf_status
->stop_registers
, REGISTER_BYTES
);
1963 /* The inferior can be gone if the user types "print exit(0)"
1964 (and perhaps other times). */
1965 if (target_has_execution
)
1966 write_register_bytes (0, inf_status
->registers
, REGISTER_BYTES
);
1968 /* The inferior can be gone if the user types "print exit(0)"
1969 (and perhaps other times). */
1971 /* FIXME: If we are being called after stopping in a function which
1972 is called from gdb, we should not be trying to restore the
1973 selected frame; it just prints a spurious error message (The
1974 message is useful, however, in detecting bugs in gdb (like if gdb
1975 clobbers the stack)). In fact, should we be restoring the
1976 inferior status at all in that case? . */
1978 if (target_has_stack
&& inf_status
->restore_stack_info
)
1980 struct restore_selected_frame_args fr
;
1981 fr
.level
= inf_status
->selected_level
;
1982 fr
.frame_address
= inf_status
->selected_frame_address
;
1983 /* The point of catch_errors is that if the stack is clobbered,
1984 walking the stack might encounter a garbage pointer and error()
1985 trying to dereference it. */
1986 if (catch_errors (restore_selected_frame
, &fr
,
1987 "Unable to restore previously selected frame:\n",
1988 RETURN_MASK_ERROR
) == 0)
1989 /* Error in restoring the selected frame. Select the innermost
1991 select_frame (get_current_frame (), 0);
1997 _initialize_infrun ()
2000 register int numsigs
;
2002 add_info ("signals", signals_info
,
2003 "What debugger does when program gets various signals.\n\
2004 Specify a signal as argument to print info on that signal only.");
2005 add_info_alias ("handle", "signals", 0);
2007 add_com ("handle", class_run
, handle_command
,
2008 concat ("Specify how to handle a signal.\n\
2009 Args are signals and actions to apply to those signals.\n\
2010 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
2011 from 1-15 are allowed for compatibility with old versions of GDB.\n\
2012 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
2013 The special arg \"all\" is recognized to mean all signals except those\n\
2014 used by the debugger, typically SIGTRAP and SIGINT.\n",
2015 "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
2016 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
2017 Stop means reenter debugger if this signal happens (implies print).\n\
2018 Print means print a message if this signal happens.\n\
2019 Pass means let program see this signal; otherwise program doesn't know.\n\
2020 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
2021 Pass and Stop may be combined.", NULL
));
2023 stop_command
= add_cmd ("stop", class_obscure
, not_just_help_class_command
,
2024 "There is no `stop' command, but you can set a hook on `stop'.\n\
2025 This allows you to set a list of commands to be run each time execution\n\
2026 of the program stops.", &cmdlist
);
2028 numsigs
= (int)TARGET_SIGNAL_LAST
;
2029 signal_stop
= (unsigned char *)
2030 xmalloc (sizeof (signal_stop
[0]) * numsigs
);
2031 signal_print
= (unsigned char *)
2032 xmalloc (sizeof (signal_print
[0]) * numsigs
);
2033 signal_program
= (unsigned char *)
2034 xmalloc (sizeof (signal_program
[0]) * numsigs
);
2035 for (i
= 0; i
< numsigs
; i
++)
2038 signal_print
[i
] = 1;
2039 signal_program
[i
] = 1;
2042 /* Signals caused by debugger's own actions
2043 should not be given to the program afterwards. */
2044 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
2045 signal_program
[TARGET_SIGNAL_INT
] = 0;
2047 /* Signals that are not errors should not normally enter the debugger. */
2048 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
2049 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
2050 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
2051 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
2052 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
2053 signal_print
[TARGET_SIGNAL_PROF
] = 0;
2054 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
2055 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
2056 signal_stop
[TARGET_SIGNAL_IO
] = 0;
2057 signal_print
[TARGET_SIGNAL_IO
] = 0;
2058 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
2059 signal_print
[TARGET_SIGNAL_POLL
] = 0;
2060 signal_stop
[TARGET_SIGNAL_URG
] = 0;
2061 signal_print
[TARGET_SIGNAL_URG
] = 0;