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"
36 /* unistd.h is needed to #define X_OK */
43 /* Prototypes for local functions */
46 signals_info PARAMS ((char *, int));
49 handle_command PARAMS ((char *, int));
51 static void sig_print_info PARAMS ((enum target_signal));
54 sig_print_header PARAMS ((void));
57 resume_cleanups PARAMS ((int));
60 hook_stop_stub PARAMS ((char *));
62 /* GET_LONGJMP_TARGET returns the PC at which longjmp() will resume the
63 program. It needs to examine the jmp_buf argument and extract the PC
64 from it. The return value is non-zero on success, zero otherwise. */
65 #ifndef GET_LONGJMP_TARGET
66 #define GET_LONGJMP_TARGET(PC_ADDR) 0
70 /* Some machines have trampoline code that sits between function callers
71 and the actual functions themselves. If this machine doesn't have
72 such things, disable their processing. */
73 #ifndef SKIP_TRAMPOLINE_CODE
74 #define SKIP_TRAMPOLINE_CODE(pc) 0
77 /* For SVR4 shared libraries, each call goes through a small piece of
78 trampoline code in the ".init" section. IN_SOLIB_TRAMPOLINE evaluates
79 to nonzero if we are current stopped in one of these. */
80 #ifndef IN_SOLIB_TRAMPOLINE
81 #define IN_SOLIB_TRAMPOLINE(pc,name) 0
84 /* On some systems, the PC may be left pointing at an instruction that won't
85 actually be executed. This is usually indicated by a bit in the PSW. If
86 we find ourselves in such a state, then we step the target beyond the
87 nullified instruction before returning control to the user so as to avoid
90 #ifndef INSTRUCTION_NULLIFIED
91 #define INSTRUCTION_NULLIFIED 0
94 /* Tables of how to react to signals; the user sets them. */
96 static unsigned char *signal_stop;
97 static unsigned char *signal_print;
98 static unsigned char *signal_program;
100 #define SET_SIGS(nsigs,sigs,flags) \
102 int signum = (nsigs); \
103 while (signum-- > 0) \
104 if ((sigs)[signum]) \
105 (flags)[signum] = 1; \
108 #define UNSET_SIGS(nsigs,sigs,flags) \
110 int signum = (nsigs); \
111 while (signum-- > 0) \
112 if ((sigs)[signum]) \
113 (flags)[signum] = 0; \
117 /* Command list pointer for the "stop" placeholder. */
119 static struct cmd_list_element *stop_command;
121 /* Nonzero if breakpoints are now inserted in the inferior. */
123 static int breakpoints_inserted;
125 /* Function inferior was in as of last step command. */
127 static struct symbol *step_start_function;
129 /* Nonzero if we are expecting a trace trap and should proceed from it. */
131 static int trap_expected;
133 /* Nonzero if the next time we try to continue the inferior, it will
134 step one instruction and generate a spurious trace trap.
135 This is used to compensate for a bug in HP-UX. */
137 static int trap_expected_after_continue;
139 /* Nonzero means expecting a trace trap
140 and should stop the inferior and return silently when it happens. */
144 /* Nonzero means expecting a trap and caller will handle it themselves.
145 It is used after attach, due to attaching to a process;
146 when running in the shell before the child program has been exec'd;
147 and when running some kinds of remote stuff (FIXME?). */
149 int stop_soon_quietly;
151 /* Nonzero if proceed is being used for a "finish" command or a similar
152 situation when stop_registers should be saved. */
154 int proceed_to_finish;
156 /* Save register contents here when about to pop a stack dummy frame,
157 if-and-only-if proceed_to_finish is set.
158 Thus this contains the return value from the called function (assuming
159 values are returned in a register). */
161 char stop_registers[REGISTER_BYTES];
163 /* Nonzero if program stopped due to error trying to insert breakpoints. */
165 static int breakpoints_failed;
167 /* Nonzero after stop if current stack frame should be printed. */
169 static int stop_print_frame;
171 #ifdef NO_SINGLE_STEP
172 extern int one_stepped; /* From machine dependent code */
173 extern void single_step (); /* Same. */
174 #endif /* NO_SINGLE_STEP */
177 /* Things to clean up if we QUIT out of resume (). */
180 resume_cleanups (arg)
186 /* Resume the inferior, but allow a QUIT. This is useful if the user
187 wants to interrupt some lengthy single-stepping operation
188 (for child processes, the SIGINT goes to the inferior, and so
189 we get a SIGINT random_signal, but for remote debugging and perhaps
190 other targets, that's not true).
192 STEP nonzero if we should step (zero to continue instead).
193 SIG is the signal to give the inferior (zero for none). */
197 enum target_signal sig;
199 struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0);
202 #ifdef CANNOT_STEP_BREAKPOINT
203 /* Most targets can step a breakpoint instruction, thus executing it
204 normally. But if this one cannot, just continue and we will hit
206 if (step && breakpoints_inserted && breakpoint_here_p (read_pc ()))
210 #ifdef NO_SINGLE_STEP
212 single_step(sig); /* Do it the hard way, w/temp breakpoints */
213 step = 0; /* ...and don't ask hardware to do it. */
217 /* Handle any optimized stores to the inferior NOW... */
218 #ifdef DO_DEFERRED_STORES
222 /* Install inferior's terminal modes. */
223 target_terminal_inferior ();
225 target_resume (-1, step, sig);
226 discard_cleanups (old_cleanups);
230 /* Clear out all variables saying what to do when inferior is continued.
231 First do this, then set the ones you want, then call `proceed'. */
234 clear_proceed_status ()
237 step_range_start = 0;
239 step_frame_address = 0;
240 step_over_calls = -1;
242 stop_soon_quietly = 0;
243 proceed_to_finish = 0;
244 breakpoint_proceeded = 1; /* We're about to proceed... */
246 /* Discard any remaining commands or status from previous stop. */
247 bpstat_clear (&stop_bpstat);
250 /* Basic routine for continuing the program in various fashions.
252 ADDR is the address to resume at, or -1 for resume where stopped.
253 SIGGNAL is the signal to give it, or 0 for none,
254 or -1 for act according to how it stopped.
255 STEP is nonzero if should trap after one instruction.
256 -1 means return after that and print nothing.
257 You should probably set various step_... variables
258 before calling here, if you are stepping.
260 You should call clear_proceed_status before calling proceed. */
263 proceed (addr, siggnal, step)
265 enum target_signal siggnal;
271 step_start_function = find_pc_function (read_pc ());
275 if (addr == (CORE_ADDR)-1)
277 /* If there is a breakpoint at the address we will resume at,
278 step one instruction before inserting breakpoints
279 so that we do not stop right away. */
281 if (breakpoint_here_p (read_pc ()))
287 if (trap_expected_after_continue)
289 /* If (step == 0), a trap will be automatically generated after
290 the first instruction is executed. Force step one
291 instruction to clear this condition. This should not occur
292 if step is nonzero, but it is harmless in that case. */
294 trap_expected_after_continue = 0;
298 /* We will get a trace trap after one instruction.
299 Continue it automatically and insert breakpoints then. */
303 int temp = insert_breakpoints ();
306 print_sys_errmsg ("ptrace", temp);
307 error ("Cannot insert breakpoints.\n\
308 The same program may be running in another process.");
310 breakpoints_inserted = 1;
313 if (siggnal != TARGET_SIGNAL_DEFAULT)
314 stop_signal = siggnal;
315 /* If this signal should not be seen by program,
316 give it zero. Used for debugging signals. */
317 else if (!signal_program[stop_signal])
318 stop_signal = TARGET_SIGNAL_0;
320 /* Resume inferior. */
321 resume (oneproc || step || bpstat_should_step (), stop_signal);
323 /* Wait for it to stop (if not standalone)
324 and in any case decode why it stopped, and act accordingly. */
326 wait_for_inferior ();
330 /* Record the pc and sp of the program the last time it stopped.
331 These are just used internally by wait_for_inferior, but need
332 to be preserved over calls to it and cleared when the inferior
334 static CORE_ADDR prev_pc;
335 static CORE_ADDR prev_sp;
336 static CORE_ADDR prev_func_start;
337 static char *prev_func_name;
340 /* Start remote-debugging of a machine over a serial link. */
345 init_wait_for_inferior ();
346 clear_proceed_status ();
347 stop_soon_quietly = 1;
349 wait_for_inferior ();
353 /* Initialize static vars when a new inferior begins. */
356 init_wait_for_inferior ()
358 /* These are meaningless until the first time through wait_for_inferior. */
362 prev_func_name = NULL;
364 trap_expected_after_continue = 0;
365 breakpoints_inserted = 0;
366 breakpoint_init_inferior ();
368 /* Don't confuse first call to proceed(). */
369 stop_signal = TARGET_SIGNAL_0;
373 delete_breakpoint_current_contents (arg)
376 struct breakpoint **breakpointp = (struct breakpoint **)arg;
377 if (*breakpointp != NULL)
378 delete_breakpoint (*breakpointp);
381 /* Wait for control to return from inferior to debugger.
382 If inferior gets a signal, we may decide to start it up again
383 instead of returning. That is why there is a loop in this function.
384 When this function actually returns it means the inferior
385 should be left stopped and GDB should read more commands. */
390 struct cleanup *old_cleanups;
391 struct target_waitstatus w;
394 CORE_ADDR stop_sp = 0;
395 CORE_ADDR stop_func_start;
396 CORE_ADDR stop_func_end;
397 char *stop_func_name;
398 CORE_ADDR prologue_pc = 0, tmp;
399 struct symtab_and_line sal;
400 int remove_breakpoints_on_following_step = 0;
402 struct symtab *current_symtab;
403 int handling_longjmp = 0; /* FIXME */
404 struct breakpoint *step_resume_breakpoint = NULL;
407 old_cleanups = make_cleanup (delete_breakpoint_current_contents,
408 &step_resume_breakpoint);
409 sal = find_pc_line(prev_pc, 0);
410 current_line = sal.line;
411 current_symtab = sal.symtab;
413 /* Are we stepping? */
414 #define CURRENTLY_STEPPING() ((step_resume_breakpoint == NULL \
415 && !handling_longjmp \
418 || bpstat_should_step ())
422 /* Clean up saved state that will become invalid. */
423 flush_cached_frames ();
424 registers_changed ();
426 pid = target_wait (-1, &w);
430 case TARGET_WAITKIND_LOADED:
431 /* Ignore it gracefully. */
432 if (breakpoints_inserted)
434 mark_breakpoints_out ();
435 insert_breakpoints ();
437 resume (0, TARGET_SIGNAL_0);
440 case TARGET_WAITKIND_SPURIOUS:
441 resume (0, TARGET_SIGNAL_0);
444 case TARGET_WAITKIND_EXITED:
445 target_terminal_ours (); /* Must do this before mourn anyway */
447 printf_filtered ("\nProgram exited with code 0%o.\n",
448 (unsigned int)w.value.integer);
451 printf_filtered ("\nProgram exited normally.\n");
452 gdb_flush (gdb_stdout);
453 target_mourn_inferior ();
454 #ifdef NO_SINGLE_STEP
457 stop_print_frame = 0;
460 case TARGET_WAITKIND_SIGNALLED:
461 stop_print_frame = 0;
462 stop_signal = w.value.sig;
463 target_terminal_ours (); /* Must do this before mourn anyway */
464 target_kill (); /* kill mourns as well */
465 printf_filtered ("\nProgram terminated with signal %s, %s.\n",
466 target_signal_to_name (stop_signal),
467 target_signal_to_string (stop_signal));
469 printf_filtered ("The program no longer exists.\n");
470 gdb_flush (gdb_stdout);
471 #ifdef NO_SINGLE_STEP
476 case TARGET_WAITKIND_STOPPED:
477 /* This is the only case in which we keep going; the above cases
478 end in a continue or goto. */
482 stop_signal = w.value.sig;
484 if (pid != inferior_pid)
486 int save_pid = inferior_pid;
488 inferior_pid = pid; /* Setup for target memory/regs */
489 registers_changed ();
490 stop_pc = read_pc ();
491 inferior_pid = save_pid;
492 registers_changed ();
495 stop_pc = read_pc ();
497 if (stop_signal == TARGET_SIGNAL_TRAP
498 && breakpoint_here_p (stop_pc - DECR_PC_AFTER_BREAK))
500 if (!breakpoint_thread_match (stop_pc - DECR_PC_AFTER_BREAK, pid))
502 /* Saw a breakpoint, but it was hit by the wrong thread. Just continue. */
503 if (breakpoints_inserted)
505 if (pid != inferior_pid)
507 int save_pid = inferior_pid;
510 registers_changed ();
511 write_pc (stop_pc - DECR_PC_AFTER_BREAK);
512 inferior_pid = save_pid;
513 registers_changed ();
516 write_pc (stop_pc - DECR_PC_AFTER_BREAK);
518 remove_breakpoints ();
519 target_resume (pid, 1, TARGET_SIGNAL_0); /* Single step */
520 /* FIXME: What if a signal arrives instead of the single-step
522 target_wait (pid, &w);
523 insert_breakpoints ();
525 target_resume (-1, 0, TARGET_SIGNAL_0);
529 if (pid != inferior_pid)
533 if (pid != inferior_pid)
537 if (!in_thread_list (pid))
539 fprintf_unfiltered (gdb_stderr, "[New %s]\n", target_pid_to_str (pid));
542 target_resume (-1, 0, TARGET_SIGNAL_0);
547 if (signal_print[stop_signal])
552 target_terminal_ours_for_output ();
553 printf_filtered ("\nProgram received signal %s, %s.\n",
554 target_signal_to_name (stop_signal),
555 target_signal_to_string (stop_signal));
556 gdb_flush (gdb_stdout);
559 if (stop_signal == TARGET_SIGNAL_TRAP
560 || signal_stop[stop_signal])
564 printf_filtered ("[Switching to %s]\n", target_pid_to_str (pid));
566 flush_cached_frames ();
567 registers_changed ();
569 if (step_resume_breakpoint)
571 delete_breakpoint (step_resume_breakpoint);
572 step_resume_breakpoint = NULL;
576 prev_func_name = NULL;
577 step_range_start = 0;
579 step_frame_address = 0;
580 handling_longjmp = 0;
586 target_terminal_inferior ();
588 /* Clear the signal if it should not be passed. */
589 if (signal_program[stop_signal] == 0)
590 stop_signal = TARGET_SIGNAL_0;
592 target_resume (pid, 0, stop_signal);
598 #ifdef NO_SINGLE_STEP
600 single_step (0); /* This actually cleans up the ss */
601 #endif /* NO_SINGLE_STEP */
603 /* If PC is pointing at a nullified instruction, then step beyond it so that
604 the user won't be confused when GDB appears to be ready to execute it. */
606 if (INSTRUCTION_NULLIFIED)
612 set_current_frame ( create_new_frame (read_fp (), stop_pc));
614 stop_frame_address = FRAME_FP (get_current_frame ());
615 stop_sp = read_sp ();
618 /* Don't care about return value; stop_func_start and stop_func_name
619 will both be 0 if it doesn't work. */
620 find_pc_partial_function (stop_pc, &stop_func_name, &stop_func_start,
622 stop_func_start += FUNCTION_START_OFFSET;
624 bpstat_clear (&stop_bpstat);
626 stop_stack_dummy = 0;
627 stop_print_frame = 1;
629 stopped_by_random_signal = 0;
630 breakpoints_failed = 0;
632 /* Look at the cause of the stop, and decide what to do.
633 The alternatives are:
634 1) break; to really stop and return to the debugger,
635 2) drop through to start up again
636 (set another_trap to 1 to single step once)
637 3) set random_signal to 1, and the decision between 1 and 2
638 will be made according to the signal handling tables. */
640 /* First, distinguish signals caused by the debugger from signals
641 that have to do with the program's own actions.
642 Note that breakpoint insns may cause SIGTRAP or SIGILL
643 or SIGEMT, depending on the operating system version.
644 Here we detect when a SIGILL or SIGEMT is really a breakpoint
645 and change it to SIGTRAP. */
647 if (stop_signal == TARGET_SIGNAL_TRAP
648 || (breakpoints_inserted &&
649 (stop_signal == TARGET_SIGNAL_ILL
650 || stop_signal == TARGET_SIGNAL_EMT
652 || stop_soon_quietly)
654 if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap)
656 stop_print_frame = 0;
659 if (stop_soon_quietly)
662 /* Don't even think about breakpoints
663 if just proceeded over a breakpoint.
665 However, if we are trying to proceed over a breakpoint
666 and end up in sigtramp, then step_resume_breakpoint
667 will be set and we should check whether we've hit the
669 if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected
670 && step_resume_breakpoint == NULL)
671 bpstat_clear (&stop_bpstat);
674 /* See if there is a breakpoint at the current PC. */
675 stop_bpstat = bpstat_stop_status
676 (&stop_pc, stop_frame_address,
677 #if DECR_PC_AFTER_BREAK
678 /* Notice the case of stepping through a jump
679 that lands just after a breakpoint.
680 Don't confuse that with hitting the breakpoint.
681 What we check for is that 1) stepping is going on
682 and 2) the pc before the last insn does not match
683 the address of the breakpoint before the current pc. */
684 (prev_pc != stop_pc - DECR_PC_AFTER_BREAK
685 && CURRENTLY_STEPPING ())
686 #else /* DECR_PC_AFTER_BREAK zero */
688 #endif /* DECR_PC_AFTER_BREAK zero */
690 /* Following in case break condition called a
692 stop_print_frame = 1;
695 if (stop_signal == TARGET_SIGNAL_TRAP)
697 = !(bpstat_explains_signal (stop_bpstat)
699 #ifndef CALL_DUMMY_BREAKPOINT_OFFSET
700 || PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address)
701 #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */
702 || (step_range_end && step_resume_breakpoint == NULL));
706 = !(bpstat_explains_signal (stop_bpstat)
707 /* End of a stack dummy. Some systems (e.g. Sony
708 news) give another signal besides SIGTRAP,
709 so check here as well as above. */
710 #ifndef CALL_DUMMY_BREAKPOINT_OFFSET
711 || PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address)
712 #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */
715 stop_signal = TARGET_SIGNAL_TRAP;
721 /* For the program's own signals, act according to
722 the signal handling tables. */
726 /* Signal not for debugging purposes. */
729 stopped_by_random_signal = 1;
731 if (signal_print[stop_signal])
735 target_terminal_ours_for_output ();
736 printf_filtered ("\nProgram received signal %s, %s.\n",
737 target_signal_to_name (stop_signal),
738 target_signal_to_string (stop_signal));
739 gdb_flush (gdb_stdout);
741 if (signal_stop[stop_signal])
743 /* If not going to stop, give terminal back
744 if we took it away. */
746 target_terminal_inferior ();
748 /* Clear the signal if it should not be passed. */
749 if (signal_program[stop_signal] == 0)
750 stop_signal = TARGET_SIGNAL_0;
752 /* I'm not sure whether this needs to be check_sigtramp2 or
753 whether it could/should be keep_going. */
754 goto check_sigtramp2;
757 /* Handle cases caused by hitting a breakpoint. */
759 CORE_ADDR jmp_buf_pc;
760 struct bpstat_what what;
762 what = bpstat_what (stop_bpstat);
766 stop_stack_dummy = 1;
768 trap_expected_after_continue = 1;
772 switch (what.main_action)
774 case BPSTAT_WHAT_SET_LONGJMP_RESUME:
775 /* If we hit the breakpoint at longjmp, disable it for the
776 duration of this command. Then, install a temporary
777 breakpoint at the target of the jmp_buf. */
778 disable_longjmp_breakpoint();
779 remove_breakpoints ();
780 breakpoints_inserted = 0;
781 if (!GET_LONGJMP_TARGET(&jmp_buf_pc)) goto keep_going;
783 /* Need to blow away step-resume breakpoint, as it
784 interferes with us */
785 if (step_resume_breakpoint != NULL)
787 delete_breakpoint (step_resume_breakpoint);
788 step_resume_breakpoint = NULL;
789 what.step_resume = 0;
793 /* FIXME - Need to implement nested temporary breakpoints */
794 if (step_over_calls > 0)
795 set_longjmp_resume_breakpoint(jmp_buf_pc,
796 get_current_frame());
799 set_longjmp_resume_breakpoint(jmp_buf_pc, NULL);
800 handling_longjmp = 1; /* FIXME */
803 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME:
804 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE:
805 remove_breakpoints ();
806 breakpoints_inserted = 0;
808 /* FIXME - Need to implement nested temporary breakpoints */
810 && (stop_frame_address
811 INNER_THAN step_frame_address))
817 disable_longjmp_breakpoint();
818 handling_longjmp = 0; /* FIXME */
819 if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME)
821 /* else fallthrough */
823 case BPSTAT_WHAT_SINGLE:
824 if (breakpoints_inserted)
825 remove_breakpoints ();
826 breakpoints_inserted = 0;
828 /* Still need to check other stuff, at least the case
829 where we are stepping and step out of the right range. */
832 case BPSTAT_WHAT_STOP_NOISY:
833 stop_print_frame = 1;
834 /* We are about to nuke the step_resume_breakpoint via the
835 cleanup chain, so no need to worry about it here. */
838 case BPSTAT_WHAT_STOP_SILENT:
839 stop_print_frame = 0;
840 /* We are about to nuke the step_resume_breakpoint via the
841 cleanup chain, so no need to worry about it here. */
844 case BPSTAT_WHAT_LAST:
845 /* Not a real code, but listed here to shut up gcc -Wall. */
847 case BPSTAT_WHAT_KEEP_CHECKING:
851 if (what.step_resume)
853 delete_breakpoint (step_resume_breakpoint);
854 step_resume_breakpoint = NULL;
856 /* If were waiting for a trap, hitting the step_resume_break
857 doesn't count as getting it. */
863 /* We come here if we hit a breakpoint but should not
864 stop for it. Possibly we also were stepping
865 and should stop for that. So fall through and
866 test for stepping. But, if not stepping,
869 #ifndef CALL_DUMMY_BREAKPOINT_OFFSET
870 /* This is the old way of detecting the end of the stack dummy.
871 An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets
872 handled above. As soon as we can test it on all of them, all
873 architectures should define it. */
875 /* If this is the breakpoint at the end of a stack dummy,
876 just stop silently, unless the user was doing an si/ni, in which
877 case she'd better know what she's doing. */
879 if (PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address)
882 stop_print_frame = 0;
883 stop_stack_dummy = 1;
885 trap_expected_after_continue = 1;
889 #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */
891 if (step_resume_breakpoint)
892 /* Having a step-resume breakpoint overrides anything
893 else having to do with stepping commands until
894 that breakpoint is reached. */
895 /* I suspect this could/should be keep_going, because if the
896 check_sigtramp2 check succeeds, then it will put in another
897 step_resume_breakpoint, and we aren't (yet) prepared to nest
899 goto check_sigtramp2;
901 if (step_range_end == 0)
902 /* Likewise if we aren't even stepping. */
903 /* I'm not sure whether this needs to be check_sigtramp2 or
904 whether it could/should be keep_going. */
905 goto check_sigtramp2;
907 /* If stepping through a line, keep going if still within it. */
908 if (stop_pc >= step_range_start
909 && stop_pc < step_range_end
910 /* The step range might include the start of the
911 function, so if we are at the start of the
912 step range and either the stack or frame pointers
913 just changed, we've stepped outside */
914 && !(stop_pc == step_range_start
915 && stop_frame_address
916 && (stop_sp INNER_THAN prev_sp
917 || stop_frame_address != step_frame_address)))
919 /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal.
920 So definately need to check for sigtramp here. */
921 goto check_sigtramp2;
924 /* We stepped out of the stepping range. See if that was due
925 to a subroutine call that we should proceed to the end of. */
927 /* Did we just take a signal? */
928 if (IN_SIGTRAMP (stop_pc, stop_func_name)
929 && !IN_SIGTRAMP (prev_pc, prev_func_name))
931 /* This code is needed at least in the following case:
932 The user types "next" and then a signal arrives (before
933 the "next" is done). */
934 /* We've just taken a signal; go until we are back to
935 the point where we took it and one more. */
937 struct symtab_and_line sr_sal;
940 sr_sal.symtab = NULL;
942 step_resume_breakpoint =
943 set_momentary_breakpoint (sr_sal, get_current_frame (),
945 if (breakpoints_inserted)
946 insert_breakpoints ();
949 /* If this is stepi or nexti, make sure that the stepping range
950 gets us past that instruction. */
951 if (step_range_end == 1)
952 /* FIXME: Does this run afoul of the code below which, if
953 we step into the middle of a line, resets the stepping
955 step_range_end = (step_range_start = prev_pc) + 1;
957 remove_breakpoints_on_following_step = 1;
963 /* Do this after the IN_SIGTRAMP check; it might give
965 prologue_pc = stop_func_start;
966 SKIP_PROLOGUE (prologue_pc);
969 if ((/* Might be a non-recursive call. If the symbols are missing
970 enough that stop_func_start == prev_func_start even though
971 they are really two functions, we will treat some calls as
973 stop_func_start != prev_func_start
975 /* Might be a recursive call if either we have a prologue
976 or the call instruction itself saves the PC on the stack. */
977 || prologue_pc != stop_func_start
978 || stop_sp != prev_sp)
979 && (/* PC is completely out of bounds of any known objfiles. Treat
980 like a subroutine call. */
983 /* If we do a call, we will be at the start of a function... */
984 || stop_pc == stop_func_start
986 /* ...except on the Alpha with -O (and also Irix 5 and
987 perhaps others), in which we might call the address
988 after the load of gp. Since prologues don't contain
989 calls, we can't return to within one, and we don't
990 jump back into them, so this check is OK. */
992 || stop_pc < prologue_pc
994 /* If we end up in certain places, it means we did a subroutine
995 call. I'm not completely sure this is necessary now that we
996 have the above checks with stop_func_start (and now that
997 find_pc_partial_function is pickier). */
998 || IN_SOLIB_TRAMPOLINE (stop_pc, stop_func_name)
1000 /* If none of the above apply, it is a jump within a function,
1001 or a return from a subroutine. The other case is longjmp,
1002 which can no longer happen here as long as the
1003 handling_longjmp stuff is working. */
1006 /* It's a subroutine call. */
1008 if (step_over_calls == 0)
1010 /* I presume that step_over_calls is only 0 when we're
1011 supposed to be stepping at the assembly language level
1012 ("stepi"). Just stop. */
1017 if (step_over_calls > 0)
1018 /* We're doing a "next". */
1019 goto step_over_function;
1021 /* If we are in a function call trampoline (a stub between
1022 the calling routine and the real function), locate the real
1023 function. That's what tells us (a) whether we want to step
1024 into it at all, and (b) what prologue we want to run to
1025 the end of, if we do step into it. */
1026 tmp = SKIP_TRAMPOLINE_CODE (stop_pc);
1028 stop_func_start = tmp;
1030 /* If we have line number information for the function we
1031 are thinking of stepping into, step into it.
1033 If there are several symtabs at that PC (e.g. with include
1034 files), just want to know whether *any* of them have line
1035 numbers. find_pc_line handles this. */
1037 struct symtab_and_line tmp_sal;
1039 tmp_sal = find_pc_line (stop_func_start, 0);
1040 if (tmp_sal.line != 0)
1041 goto step_into_function;
1045 /* A subroutine call has happened. */
1047 /* Set a special breakpoint after the return */
1048 struct symtab_and_line sr_sal;
1051 (SAVED_PC_AFTER_CALL (get_current_frame ()));
1052 sr_sal.symtab = NULL;
1054 step_resume_breakpoint =
1055 set_momentary_breakpoint (sr_sal, get_current_frame (),
1057 if (breakpoints_inserted)
1058 insert_breakpoints ();
1063 /* Subroutine call with source code we should not step over.
1064 Do step to the first line of code in it. */
1065 SKIP_PROLOGUE (stop_func_start);
1066 sal = find_pc_line (stop_func_start, 0);
1067 /* Use the step_resume_break to step until
1068 the end of the prologue, even if that involves jumps
1069 (as it seems to on the vax under 4.2). */
1070 /* If the prologue ends in the middle of a source line,
1071 continue to the end of that source line (if it is still
1072 within the function). Otherwise, just go to end of prologue. */
1073 #ifdef PROLOGUE_FIRSTLINE_OVERLAP
1074 /* no, don't either. It skips any code that's
1075 legitimately on the first line. */
1077 if (sal.end && sal.pc != stop_func_start && sal.end < stop_func_end)
1078 stop_func_start = sal.end;
1081 if (stop_func_start == stop_pc)
1083 /* We are already there: stop now. */
1088 /* Put the step-breakpoint there and go until there. */
1090 struct symtab_and_line sr_sal;
1092 sr_sal.pc = stop_func_start;
1093 sr_sal.symtab = NULL;
1095 /* Do not specify what the fp should be when we stop
1096 since on some machines the prologue
1097 is where the new fp value is established. */
1098 step_resume_breakpoint =
1099 set_momentary_breakpoint (sr_sal, NULL, bp_step_resume);
1100 if (breakpoints_inserted)
1101 insert_breakpoints ();
1103 /* And make sure stepping stops right away then. */
1104 step_range_end = step_range_start;
1109 /* We've wandered out of the step range. */
1111 sal = find_pc_line(stop_pc, 0);
1113 if (step_range_end == 1)
1115 /* It is stepi or nexti. We always want to stop stepping after
1123 /* We have no line number information. That means to stop
1124 stepping (does this always happen right after one instruction,
1125 when we do "s" in a function with no line numbers,
1126 or can this happen as a result of a return or longjmp?). */
1131 if (stop_pc == sal.pc
1132 && (current_line != sal.line || current_symtab != sal.symtab))
1134 /* We are at the start of a different line. So stop. Note that
1135 we don't stop if we step into the middle of a different line.
1136 That is said to make things like for (;;) statements work
1142 /* We aren't done stepping.
1144 Optimize by setting the stepping range to the line.
1145 (We might not be in the original line, but if we entered a
1146 new line in mid-statement, we continue stepping. This makes
1147 things like for(;;) statements work better.) */
1149 if (stop_func_end && sal.end >= stop_func_end)
1151 /* If this is the last line of the function, don't keep stepping
1152 (it would probably step us out of the function).
1153 This is particularly necessary for a one-line function,
1154 in which after skipping the prologue we better stop even though
1155 we will be in mid-line. */
1159 step_range_start = sal.pc;
1160 step_range_end = sal.end;
1165 && IN_SIGTRAMP (stop_pc, stop_func_name)
1166 && !IN_SIGTRAMP (prev_pc, prev_func_name))
1168 /* What has happened here is that we have just stepped the inferior
1169 with a signal (because it is a signal which shouldn't make
1170 us stop), thus stepping into sigtramp.
1172 So we need to set a step_resume_break_address breakpoint
1173 and continue until we hit it, and then step. FIXME: This should
1174 be more enduring than a step_resume breakpoint; we should know
1175 that we will later need to keep going rather than re-hitting
1176 the breakpoint here (see testsuite/gdb.t06/signals.exp where
1177 it says "exceedingly difficult"). */
1178 struct symtab_and_line sr_sal;
1180 sr_sal.pc = prev_pc;
1181 sr_sal.symtab = NULL;
1183 step_resume_breakpoint =
1184 set_momentary_breakpoint (sr_sal, get_current_frame (),
1186 if (breakpoints_inserted)
1187 insert_breakpoints ();
1189 remove_breakpoints_on_following_step = 1;
1194 /* Come to this label when you need to resume the inferior.
1195 It's really much cleaner to do a goto than a maze of if-else
1198 /* Save the pc before execution, to compare with pc after stop. */
1199 prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */
1200 prev_func_start = stop_func_start; /* Ok, since if DECR_PC_AFTER
1201 BREAK is defined, the
1202 original pc would not have
1203 been at the start of a
1205 prev_func_name = stop_func_name;
1208 /* If we did not do break;, it means we should keep
1209 running the inferior and not return to debugger. */
1211 if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP)
1213 /* We took a signal (which we are supposed to pass through to
1214 the inferior, else we'd have done a break above) and we
1215 haven't yet gotten our trap. Simply continue. */
1216 resume (CURRENTLY_STEPPING (), stop_signal);
1220 /* Either the trap was not expected, but we are continuing
1221 anyway (the user asked that this signal be passed to the
1224 The signal was SIGTRAP, e.g. it was our signal, but we
1225 decided we should resume from it.
1227 We're going to run this baby now!
1229 Insert breakpoints now, unless we are trying
1230 to one-proceed past a breakpoint. */
1231 /* If we've just finished a special step resume and we don't
1232 want to hit a breakpoint, pull em out. */
1233 if (step_resume_breakpoint == NULL &&
1234 remove_breakpoints_on_following_step)
1236 remove_breakpoints_on_following_step = 0;
1237 remove_breakpoints ();
1238 breakpoints_inserted = 0;
1240 else if (!breakpoints_inserted &&
1241 (step_resume_breakpoint != NULL || !another_trap))
1243 breakpoints_failed = insert_breakpoints ();
1244 if (breakpoints_failed)
1246 breakpoints_inserted = 1;
1249 trap_expected = another_trap;
1251 if (stop_signal == TARGET_SIGNAL_TRAP)
1252 stop_signal = TARGET_SIGNAL_0;
1254 #ifdef SHIFT_INST_REGS
1255 /* I'm not sure when this following segment applies. I do know, now,
1256 that we shouldn't rewrite the regs when we were stopped by a
1257 random signal from the inferior process. */
1258 /* FIXME: Shouldn't this be based on the valid bit of the SXIP?
1259 (this is only used on the 88k). */
1261 if (!bpstat_explains_signal (stop_bpstat)
1262 && (stop_signal != TARGET_SIGNAL_CHLD)
1263 && !stopped_by_random_signal)
1265 #endif /* SHIFT_INST_REGS */
1267 resume (CURRENTLY_STEPPING (), stop_signal);
1272 if (target_has_execution)
1274 /* Assuming the inferior still exists, set these up for next
1275 time, just like we did above if we didn't break out of the
1277 prev_pc = read_pc ();
1278 prev_func_start = stop_func_start;
1279 prev_func_name = stop_func_name;
1282 do_cleanups (old_cleanups);
1285 /* Here to return control to GDB when the inferior stops for real.
1286 Print appropriate messages, remove breakpoints, give terminal our modes.
1288 STOP_PRINT_FRAME nonzero means print the executing frame
1289 (pc, function, args, file, line number and line text).
1290 BREAKPOINTS_FAILED nonzero means stop was due to error
1291 attempting to insert breakpoints. */
1296 /* Make sure that the current_frame's pc is correct. This
1297 is a correction for setting up the frame info before doing
1298 DECR_PC_AFTER_BREAK */
1299 if (target_has_execution && get_current_frame())
1300 (get_current_frame ())->pc = read_pc ();
1302 if (breakpoints_failed)
1304 target_terminal_ours_for_output ();
1305 print_sys_errmsg ("ptrace", breakpoints_failed);
1306 printf_filtered ("Stopped; cannot insert breakpoints.\n\
1307 The same program may be running in another process.\n");
1310 if (target_has_execution && breakpoints_inserted)
1311 if (remove_breakpoints ())
1313 target_terminal_ours_for_output ();
1314 printf_filtered ("Cannot remove breakpoints because program is no longer writable.\n\
1315 It might be running in another process.\n\
1316 Further execution is probably impossible.\n");
1319 breakpoints_inserted = 0;
1321 /* Delete the breakpoint we stopped at, if it wants to be deleted.
1322 Delete any breakpoint that is to be deleted at the next stop. */
1324 breakpoint_auto_delete (stop_bpstat);
1326 /* If an auto-display called a function and that got a signal,
1327 delete that auto-display to avoid an infinite recursion. */
1329 if (stopped_by_random_signal)
1330 disable_current_display ();
1332 if (step_multi && stop_step)
1335 target_terminal_ours ();
1337 /* Look up the hook_stop and run it if it exists. */
1339 if (stop_command->hook)
1341 catch_errors (hook_stop_stub, (char *)stop_command->hook,
1342 "Error while running hook_stop:\n", RETURN_MASK_ALL);
1345 if (!target_has_stack)
1348 /* Select innermost stack frame except on return from a stack dummy routine,
1349 or if the program has exited. Print it without a level number if
1350 we have changed functions or hit a breakpoint. Print source line
1352 if (!stop_stack_dummy)
1354 select_frame (get_current_frame (), 0);
1356 if (stop_print_frame)
1360 source_only = bpstat_print (stop_bpstat);
1361 source_only = source_only ||
1363 && step_frame_address == stop_frame_address
1364 && step_start_function == find_pc_function (stop_pc));
1366 print_stack_frame (selected_frame, -1, source_only? -1: 1);
1368 /* Display the auto-display expressions. */
1373 /* Save the function value return registers, if we care.
1374 We might be about to restore their previous contents. */
1375 if (proceed_to_finish)
1376 read_register_bytes (0, stop_registers, REGISTER_BYTES);
1378 if (stop_stack_dummy)
1380 /* Pop the empty frame that contains the stack dummy.
1381 POP_FRAME ends with a setting of the current frame, so we
1382 can use that next. */
1384 select_frame (get_current_frame (), 0);
1389 hook_stop_stub (cmd)
1392 execute_user_command ((struct cmd_list_element *)cmd, 0);
1396 int signal_stop_state (signo)
1399 return signal_stop[signo];
1402 int signal_print_state (signo)
1405 return signal_print[signo];
1408 int signal_pass_state (signo)
1411 return signal_program[signo];
1418 Signal Stop\tPrint\tPass to program\tDescription\n");
1422 sig_print_info (oursig)
1423 enum target_signal oursig;
1425 char *name = target_signal_to_name (oursig);
1426 printf_filtered ("%s", name);
1427 printf_filtered ("%*.*s ", 13 - strlen (name), 13 - strlen (name),
1429 printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No");
1430 printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No");
1431 printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No");
1432 printf_filtered ("%s\n", target_signal_to_string (oursig));
1435 /* Specify how various signals in the inferior should be handled. */
1438 handle_command (args, from_tty)
1443 int digits, wordlen;
1444 int sigfirst, signum, siglast;
1445 enum target_signal oursig;
1448 unsigned char *sigs;
1449 struct cleanup *old_chain;
1453 error_no_arg ("signal to handle");
1456 /* Allocate and zero an array of flags for which signals to handle. */
1458 nsigs = (int)TARGET_SIGNAL_LAST;
1459 sigs = (unsigned char *) alloca (nsigs);
1460 memset (sigs, 0, nsigs);
1462 /* Break the command line up into args. */
1464 argv = buildargv (args);
1469 old_chain = make_cleanup (freeargv, (char *) argv);
1471 /* Walk through the args, looking for signal oursigs, signal names, and
1472 actions. Signal numbers and signal names may be interspersed with
1473 actions, with the actions being performed for all signals cumulatively
1474 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
1476 while (*argv != NULL)
1478 wordlen = strlen (*argv);
1479 for (digits = 0; isdigit ((*argv)[digits]); digits++) {;}
1481 sigfirst = siglast = -1;
1483 if (wordlen >= 1 && !strncmp (*argv, "all", wordlen))
1485 /* Apply action to all signals except those used by the
1486 debugger. Silently skip those. */
1489 siglast = nsigs - 1;
1491 else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen))
1493 SET_SIGS (nsigs, sigs, signal_stop);
1494 SET_SIGS (nsigs, sigs, signal_print);
1496 else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen))
1498 UNSET_SIGS (nsigs, sigs, signal_program);
1500 else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen))
1502 SET_SIGS (nsigs, sigs, signal_print);
1504 else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen))
1506 SET_SIGS (nsigs, sigs, signal_program);
1508 else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen))
1510 UNSET_SIGS (nsigs, sigs, signal_stop);
1512 else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen))
1514 SET_SIGS (nsigs, sigs, signal_program);
1516 else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen))
1518 UNSET_SIGS (nsigs, sigs, signal_print);
1519 UNSET_SIGS (nsigs, sigs, signal_stop);
1521 else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen))
1523 UNSET_SIGS (nsigs, sigs, signal_program);
1525 else if (digits > 0)
1527 /* It is numeric. The numeric signal refers to our own internal
1528 signal numbering from target.h, not to host/target signal number.
1529 This is a feature; users really should be using symbolic names
1530 anyway, and the common ones like SIGHUP, SIGINT, SIGALRM, etc.
1531 will work right anyway. */
1533 sigfirst = siglast = atoi (*argv);
1534 if ((*argv)[digits] == '-')
1536 siglast = atoi ((*argv) + digits + 1);
1538 if (sigfirst > siglast)
1540 /* Bet he didn't figure we'd think of this case... */
1545 if (sigfirst < 0 || sigfirst >= nsigs)
1547 error ("Signal %d not in range 0-%d", sigfirst, nsigs - 1);
1549 if (siglast < 0 || siglast >= nsigs)
1551 error ("Signal %d not in range 0-%d", siglast, nsigs - 1);
1556 oursig = target_signal_from_name (*argv);
1557 if (oursig != TARGET_SIGNAL_UNKNOWN)
1559 sigfirst = siglast = (int)oursig;
1563 /* Not a number and not a recognized flag word => complain. */
1564 error ("Unrecognized or ambiguous flag word: \"%s\".", *argv);
1568 /* If any signal numbers or symbol names were found, set flags for
1569 which signals to apply actions to. */
1571 for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++)
1573 switch ((enum target_signal)signum)
1575 case TARGET_SIGNAL_TRAP:
1576 case TARGET_SIGNAL_INT:
1577 if (!allsigs && !sigs[signum])
1579 if (query ("%s is used by the debugger.\n\
1580 Are you sure you want to change it? ",
1581 target_signal_to_name
1582 ((enum target_signal)signum)))
1588 printf_unfiltered ("Not confirmed, unchanged.\n");
1589 gdb_flush (gdb_stdout);
1602 target_notice_signals(inferior_pid);
1606 /* Show the results. */
1607 sig_print_header ();
1608 for (signum = 0; signum < nsigs; signum++)
1612 sig_print_info (signum);
1617 do_cleanups (old_chain);
1620 /* Print current contents of the tables set by the handle command.
1621 It is possible we should just be printing signals actually used
1622 by the current target (but for things to work right when switching
1623 targets, all signals should be in the signal tables). */
1626 signals_info (signum_exp, from_tty)
1630 enum target_signal oursig;
1631 sig_print_header ();
1635 /* First see if this is a symbol name. */
1636 oursig = target_signal_from_name (signum_exp);
1637 if (oursig == TARGET_SIGNAL_UNKNOWN)
1639 /* Nope, maybe it's an address which evaluates to a signal
1641 /* The numeric signal refers to our own internal
1642 signal numbering from target.h, not to host/target signal number.
1643 This is a feature; users really should be using symbolic names
1644 anyway, and the common ones like SIGHUP, SIGINT, SIGALRM, etc.
1645 will work right anyway. */
1646 int i = parse_and_eval_address (signum_exp);
1647 if (i >= (int)TARGET_SIGNAL_LAST
1649 || i == (int)TARGET_SIGNAL_UNKNOWN
1650 || i == (int)TARGET_SIGNAL_DEFAULT)
1651 error ("Signal number out of bounds.");
1652 oursig = (enum target_signal)i;
1654 sig_print_info (oursig);
1658 printf_filtered ("\n");
1659 /* These ugly casts brought to you by the native VAX compiler. */
1661 (int)oursig < (int)TARGET_SIGNAL_LAST;
1662 oursig = (enum target_signal)((int)oursig + 1))
1666 if (oursig != TARGET_SIGNAL_UNKNOWN
1667 && oursig != TARGET_SIGNAL_DEFAULT
1668 && oursig != TARGET_SIGNAL_0)
1669 sig_print_info (oursig);
1672 printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
1675 /* Save all of the information associated with the inferior<==>gdb
1676 connection. INF_STATUS is a pointer to a "struct inferior_status"
1677 (defined in inferior.h). */
1680 save_inferior_status (inf_status, restore_stack_info)
1681 struct inferior_status *inf_status;
1682 int restore_stack_info;
1684 inf_status->stop_signal = stop_signal;
1685 inf_status->stop_pc = stop_pc;
1686 inf_status->stop_frame_address = stop_frame_address;
1687 inf_status->stop_step = stop_step;
1688 inf_status->stop_stack_dummy = stop_stack_dummy;
1689 inf_status->stopped_by_random_signal = stopped_by_random_signal;
1690 inf_status->trap_expected = trap_expected;
1691 inf_status->step_range_start = step_range_start;
1692 inf_status->step_range_end = step_range_end;
1693 inf_status->step_frame_address = step_frame_address;
1694 inf_status->step_over_calls = step_over_calls;
1695 inf_status->stop_after_trap = stop_after_trap;
1696 inf_status->stop_soon_quietly = stop_soon_quietly;
1697 /* Save original bpstat chain here; replace it with copy of chain.
1698 If caller's caller is walking the chain, they'll be happier if we
1699 hand them back the original chain when restore_i_s is called. */
1700 inf_status->stop_bpstat = stop_bpstat;
1701 stop_bpstat = bpstat_copy (stop_bpstat);
1702 inf_status->breakpoint_proceeded = breakpoint_proceeded;
1703 inf_status->restore_stack_info = restore_stack_info;
1704 inf_status->proceed_to_finish = proceed_to_finish;
1706 memcpy (inf_status->stop_registers, stop_registers, REGISTER_BYTES);
1708 read_register_bytes (0, inf_status->registers, REGISTER_BYTES);
1710 record_selected_frame (&(inf_status->selected_frame_address),
1711 &(inf_status->selected_level));
1715 struct restore_selected_frame_args {
1716 FRAME_ADDR frame_address;
1720 static int restore_selected_frame PARAMS ((char *));
1722 /* Restore the selected frame. args is really a struct
1723 restore_selected_frame_args * (declared as char * for catch_errors)
1724 telling us what frame to restore. Returns 1 for success, or 0 for
1725 failure. An error message will have been printed on error. */
1727 restore_selected_frame (args)
1730 struct restore_selected_frame_args *fr =
1731 (struct restore_selected_frame_args *) args;
1733 int level = fr->level;
1735 fid = find_relative_frame (get_current_frame (), &level);
1737 /* If inf_status->selected_frame_address is NULL, there was no
1738 previously selected frame. */
1740 FRAME_FP (fid) != fr->frame_address ||
1743 warning ("Unable to restore previously selected frame.\n");
1746 select_frame (fid, fr->level);
1751 restore_inferior_status (inf_status)
1752 struct inferior_status *inf_status;
1754 stop_signal = inf_status->stop_signal;
1755 stop_pc = inf_status->stop_pc;
1756 stop_frame_address = inf_status->stop_frame_address;
1757 stop_step = inf_status->stop_step;
1758 stop_stack_dummy = inf_status->stop_stack_dummy;
1759 stopped_by_random_signal = inf_status->stopped_by_random_signal;
1760 trap_expected = inf_status->trap_expected;
1761 step_range_start = inf_status->step_range_start;
1762 step_range_end = inf_status->step_range_end;
1763 step_frame_address = inf_status->step_frame_address;
1764 step_over_calls = inf_status->step_over_calls;
1765 stop_after_trap = inf_status->stop_after_trap;
1766 stop_soon_quietly = inf_status->stop_soon_quietly;
1767 bpstat_clear (&stop_bpstat);
1768 stop_bpstat = inf_status->stop_bpstat;
1769 breakpoint_proceeded = inf_status->breakpoint_proceeded;
1770 proceed_to_finish = inf_status->proceed_to_finish;
1772 memcpy (stop_registers, inf_status->stop_registers, REGISTER_BYTES);
1774 /* The inferior can be gone if the user types "print exit(0)"
1775 (and perhaps other times). */
1776 if (target_has_execution)
1777 write_register_bytes (0, inf_status->registers, REGISTER_BYTES);
1779 /* The inferior can be gone if the user types "print exit(0)"
1780 (and perhaps other times). */
1782 /* FIXME: If we are being called after stopping in a function which
1783 is called from gdb, we should not be trying to restore the
1784 selected frame; it just prints a spurious error message (The
1785 message is useful, however, in detecting bugs in gdb (like if gdb
1786 clobbers the stack)). In fact, should we be restoring the
1787 inferior status at all in that case? . */
1789 if (target_has_stack && inf_status->restore_stack_info)
1791 struct restore_selected_frame_args fr;
1792 fr.level = inf_status->selected_level;
1793 fr.frame_address = inf_status->selected_frame_address;
1794 /* The point of catch_errors is that if the stack is clobbered,
1795 walking the stack might encounter a garbage pointer and error()
1796 trying to dereference it. */
1797 if (catch_errors (restore_selected_frame, &fr,
1798 "Unable to restore previously selected frame:\n",
1799 RETURN_MASK_ERROR) == 0)
1800 /* Error in restoring the selected frame. Select the innermost
1802 select_frame (get_current_frame (), 0);
1808 _initialize_infrun ()
1811 register int numsigs;
1813 add_info ("signals", signals_info,
1814 "What debugger does when program gets various signals.\n\
1815 Specify a signal number as argument to print info on that signal only.");
1816 add_info_alias ("handle", "signals", 0);
1818 add_com ("handle", class_run, handle_command,
1819 "Specify how to handle a signal.\n\
1820 Args are signal numbers and actions to apply to those signals.\n\
1821 Signal numbers may be numeric (ex. 11) or symbolic (ex. SIGSEGV).\n\
1822 Numeric ranges may be specified with the form LOW-HIGH (ex. 14-21).\n\
1823 The special arg \"all\" is recognized to mean all signals except those\n\
1824 used by the debugger, typically SIGTRAP and SIGINT.\n\
1825 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
1826 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
1827 Stop means reenter debugger if this signal happens (implies print).\n\
1828 Print means print a message if this signal happens.\n\
1829 Pass means let program see this signal; otherwise program doesn't know.\n\
1830 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
1831 Pass and Stop may be combined.");
1833 stop_command = add_cmd ("stop", class_obscure, not_just_help_class_command,
1834 "There is no `stop' command, but you can set a hook on `stop'.\n\
1835 This allows you to set a list of commands to be run each time execution\n\
1836 of the program stops.", &cmdlist);
1838 numsigs = (int)TARGET_SIGNAL_LAST;
1839 signal_stop = (unsigned char *)
1840 xmalloc (sizeof (signal_stop[0]) * numsigs);
1841 signal_print = (unsigned char *)
1842 xmalloc (sizeof (signal_print[0]) * numsigs);
1843 signal_program = (unsigned char *)
1844 xmalloc (sizeof (signal_program[0]) * numsigs);
1845 for (i = 0; i < numsigs; i++)
1848 signal_print[i] = 1;
1849 signal_program[i] = 1;
1852 /* Signals caused by debugger's own actions
1853 should not be given to the program afterwards. */
1854 signal_program[TARGET_SIGNAL_TRAP] = 0;
1855 signal_program[TARGET_SIGNAL_INT] = 0;
1857 /* Signals that are not errors should not normally enter the debugger. */
1858 signal_stop[TARGET_SIGNAL_ALRM] = 0;
1859 signal_print[TARGET_SIGNAL_ALRM] = 0;
1860 signal_stop[TARGET_SIGNAL_VTALRM] = 0;
1861 signal_print[TARGET_SIGNAL_VTALRM] = 0;
1862 signal_stop[TARGET_SIGNAL_PROF] = 0;
1863 signal_print[TARGET_SIGNAL_PROF] = 0;
1864 signal_stop[TARGET_SIGNAL_CHLD] = 0;
1865 signal_print[TARGET_SIGNAL_CHLD] = 0;
1866 signal_stop[TARGET_SIGNAL_IO] = 0;
1867 signal_print[TARGET_SIGNAL_IO] = 0;
1868 signal_stop[TARGET_SIGNAL_POLL] = 0;
1869 signal_print[TARGET_SIGNAL_POLL] = 0;
1870 signal_stop[TARGET_SIGNAL_URG] = 0;
1871 signal_print[TARGET_SIGNAL_URG] = 0;