1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002
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., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 #include "linux-low.h"
27 #include <sys/param.h>
29 #include <sys/ptrace.h>
32 #include <sys/ioctl.h>
38 /* ``all_threads'' is keyed by the LWP ID - it should be the thread ID instead,
39 however. This requires changing the ID in place when we go from !using_threads
40 to using_threads, immediately.
42 ``all_processes'' is keyed by the process ID - which on Linux is (presently)
43 the same as the LWP ID. */
45 struct inferior_list all_processes
;
47 /* FIXME this is a bit of a hack, and could be removed. */
50 /* FIXME make into a target method? */
53 static void linux_resume_one_process (struct inferior_list_entry
*entry
,
54 int step
, int signal
);
55 static void linux_resume (int step
, int signal
);
56 static void stop_all_processes (void);
57 static int linux_wait_for_event (struct thread_info
*child
);
59 struct pending_signals
62 struct pending_signals
*prev
;
65 #define PTRACE_ARG3_TYPE long
66 #define PTRACE_XFER_TYPE long
68 #ifdef HAVE_LINUX_REGSETS
69 static int use_regsets_p
= 1;
74 int debug_threads
= 0;
76 #define pid_of(proc) ((proc)->head.id)
78 /* FIXME: Delete eventually. */
79 #define inferior_pid (pid_of (get_thread_process (current_inferior)))
81 /* This function should only be called if the process got a SIGTRAP.
82 The SIGTRAP could mean several things.
84 On i386, where decr_pc_after_break is non-zero:
85 If we were single-stepping this process using PTRACE_SINGLESTEP,
86 we will get only the one SIGTRAP (even if the instruction we
87 stepped over was a breakpoint). The value of $eip will be the
89 If we continue the process using PTRACE_CONT, we will get a
90 SIGTRAP when we hit a breakpoint. The value of $eip will be
91 the instruction after the breakpoint (i.e. needs to be
92 decremented). If we report the SIGTRAP to GDB, we must also
93 report the undecremented PC. If we cancel the SIGTRAP, we
94 must resume at the decremented PC.
96 (Presumably, not yet tested) On a non-decr_pc_after_break machine
97 with hardware or kernel single-step:
98 If we single-step over a breakpoint instruction, our PC will
99 point at the following instruction. If we continue and hit a
100 breakpoint instruction, our PC will point at the breakpoint
106 CORE_ADDR stop_pc
= (*the_low_target
.get_pc
) ();
108 if (get_thread_process (current_inferior
)->stepping
)
111 return stop_pc
- the_low_target
.decr_pc_after_break
;
115 add_process (int pid
)
117 struct process_info
*process
;
119 process
= (struct process_info
*) malloc (sizeof (*process
));
120 memset (process
, 0, sizeof (*process
));
122 process
->head
.id
= pid
;
124 /* Default to tid == lwpid == pid. */
126 process
->lwpid
= pid
;
128 add_inferior_to_list (&all_processes
, &process
->head
);
133 /* Start an inferior process and returns its pid.
134 ALLARGS is a vector of program-name and args. */
137 linux_create_inferior (char *program
, char **allargs
)
144 perror_with_name ("fork");
148 ptrace (PTRACE_TRACEME
, 0, 0, 0);
150 signal (SIGRTMIN
+ 1, SIG_DFL
);
154 execv (program
, allargs
);
156 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
162 new_process
= add_process (pid
);
163 add_thread (pid
, new_process
);
168 /* Attach to an inferior process. */
171 linux_attach_lwp (int pid
, int tid
)
173 struct process_info
*new_process
;
175 if (ptrace (PTRACE_ATTACH
, pid
, 0, 0) != 0)
177 fprintf (stderr
, "Cannot attach to process %d: %s (%d)\n", pid
,
178 errno
< sys_nerr
? sys_errlist
[errno
] : "unknown error",
182 /* If we fail to attach to an LWP, just return. */
188 new_process
= (struct process_info
*) add_process (pid
);
189 add_thread (tid
, new_process
);
191 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
192 brings it to a halt. We should ignore that SIGSTOP and resume the process
193 (unless this is the first process, in which case the flag will be cleared
196 On the other hand, if we are currently trying to stop all threads, we
197 should treat the new thread as if we had sent it a SIGSTOP. This works
198 because we are guaranteed that add_process added us to the end of the
199 list, and so the new thread has not yet reached wait_for_sigstop (but
201 if (! stopping_threads
)
202 new_process
->stop_expected
= 1;
206 linux_attach (int pid
)
208 struct process_info
*process
;
210 linux_attach_lwp (pid
, pid
);
212 /* Don't ignore the initial SIGSTOP if we just attached to this process. */
213 process
= (struct process_info
*) find_inferior_id (&all_processes
, pid
);
214 process
->stop_expected
= 0;
219 /* Kill the inferior process. Make us have no inferior. */
222 linux_kill_one_process (struct inferior_list_entry
*entry
)
224 struct thread_info
*thread
= (struct thread_info
*) entry
;
225 struct process_info
*process
= get_thread_process (thread
);
230 ptrace (PTRACE_KILL
, pid_of (process
), 0, 0);
232 /* Make sure it died. The loop is most likely unnecessary. */
233 wstat
= linux_wait_for_event (thread
);
234 } while (WIFSTOPPED (wstat
));
237 /* Return nonzero if the given thread is still alive. */
241 for_each_inferior (&all_threads
, linux_kill_one_process
);
245 linux_thread_alive (int tid
)
247 if (find_inferior_id (&all_threads
, tid
) != NULL
)
253 /* Return nonzero if this process stopped at a breakpoint which
254 no longer appears to be inserted. Also adjust the PC
255 appropriately to resume where the breakpoint used to be. */
257 check_removed_breakpoint (struct process_info
*event_child
)
260 struct thread_info
*saved_inferior
;
262 if (event_child
->pending_is_breakpoint
== 0)
266 fprintf (stderr
, "Checking for breakpoint.\n");
268 saved_inferior
= current_inferior
;
269 current_inferior
= get_process_thread (event_child
);
271 stop_pc
= get_stop_pc ();
273 /* If the PC has changed since we stopped, then we shouldn't do
274 anything. This happens if, for instance, GDB handled the
275 decr_pc_after_break subtraction itself. */
276 if (stop_pc
!= event_child
->pending_stop_pc
)
279 fprintf (stderr
, "Ignoring, PC was changed.\n");
281 event_child
->pending_is_breakpoint
= 0;
282 current_inferior
= saved_inferior
;
286 /* If the breakpoint is still there, we will report hitting it. */
287 if ((*the_low_target
.breakpoint_at
) (stop_pc
))
290 fprintf (stderr
, "Ignoring, breakpoint is still present.\n");
291 current_inferior
= saved_inferior
;
296 fprintf (stderr
, "Removed breakpoint.\n");
298 /* For decr_pc_after_break targets, here is where we perform the
299 decrement. We go immediately from this function to resuming,
300 and can not safely call get_stop_pc () again. */
301 if (the_low_target
.set_pc
!= NULL
)
302 (*the_low_target
.set_pc
) (stop_pc
);
304 /* We consumed the pending SIGTRAP. */
305 event_child
->status_pending_p
= 0;
306 event_child
->status_pending
= 0;
308 current_inferior
= saved_inferior
;
312 /* Return 1 if this process has an interesting status pending. This function
313 may silently resume an inferior process. */
315 status_pending_p (struct inferior_list_entry
*entry
, void *dummy
)
317 struct process_info
*process
= (struct process_info
*) entry
;
319 if (process
->status_pending_p
)
320 if (check_removed_breakpoint (process
))
322 /* This thread was stopped at a breakpoint, and the breakpoint
323 is now gone. We were told to continue (or step...) all threads,
324 so GDB isn't trying to single-step past this breakpoint.
325 So instead of reporting the old SIGTRAP, pretend we got to
326 the breakpoint just after it was removed instead of just
327 before; resume the process. */
328 linux_resume_one_process (&process
->head
, 0, 0);
332 return process
->status_pending_p
;
336 linux_wait_for_process (struct process_info
**childp
, int *wstatp
)
339 int to_wait_for
= -1;
342 to_wait_for
= (*childp
)->lwpid
;
346 ret
= waitpid (to_wait_for
, wstatp
, WNOHANG
);
351 perror_with_name ("waitpid");
356 ret
= waitpid (to_wait_for
, wstatp
, WNOHANG
| __WCLONE
);
361 perror_with_name ("waitpid (WCLONE)");
370 && (!WIFSTOPPED (*wstatp
)
371 || (WSTOPSIG (*wstatp
) != 32
372 && WSTOPSIG (*wstatp
) != 33)))
373 fprintf (stderr
, "Got an event from %d (%x)\n", ret
, *wstatp
);
375 if (to_wait_for
== -1)
376 *childp
= (struct process_info
*) find_inferior_id (&all_processes
, ret
);
378 (*childp
)->stopped
= 1;
379 (*childp
)->pending_is_breakpoint
= 0;
382 && WIFSTOPPED (*wstatp
))
384 current_inferior
= (struct thread_info
*)
385 find_inferior_id (&all_threads
, (*childp
)->tid
);
386 /* For testing only; i386_stop_pc prints out a diagnostic. */
387 if (the_low_target
.get_pc
!= NULL
)
393 linux_wait_for_event (struct thread_info
*child
)
396 struct process_info
*event_child
;
399 /* Check for a process with a pending status. */
400 /* It is possible that the user changed the pending task's registers since
401 it stopped. We correctly handle the change of PC if we hit a breakpoint
402 (in check_removed_breakpoints); signals should be reported anyway. */
405 event_child
= (struct process_info
*)
406 find_inferior (&all_processes
, status_pending_p
, NULL
);
407 if (debug_threads
&& event_child
)
408 fprintf (stderr
, "Got a pending child %d\n", event_child
->lwpid
);
412 event_child
= get_thread_process (child
);
413 if (event_child
->status_pending_p
414 && check_removed_breakpoint (event_child
))
418 if (event_child
!= NULL
)
420 if (event_child
->status_pending_p
)
423 fprintf (stderr
, "Got an event from pending child %d (%04x)\n",
424 event_child
->lwpid
, event_child
->status_pending
);
425 wstat
= event_child
->status_pending
;
426 event_child
->status_pending_p
= 0;
427 event_child
->status_pending
= 0;
428 current_inferior
= get_process_thread (event_child
);
433 /* We only enter this loop if no process has a pending wait status. Thus
434 any action taken in response to a wait status inside this loop is
435 responding as soon as we detect the status, not after any pending
442 event_child
= get_thread_process (child
);
444 linux_wait_for_process (&event_child
, &wstat
);
446 if (event_child
== NULL
)
447 error ("event from unknown child");
449 current_inferior
= (struct thread_info
*)
450 find_inferior_id (&all_threads
, event_child
->tid
);
454 /* Check for thread exit. */
455 if (! WIFSTOPPED (wstat
))
458 fprintf (stderr
, "Thread %d (LWP %d) exiting\n",
459 event_child
->tid
, event_child
->head
.id
);
461 /* If the last thread is exiting, just return. */
462 if (all_threads
.head
== all_threads
.tail
)
465 dead_thread_notify (event_child
->tid
);
467 remove_inferior (&all_processes
, &event_child
->head
);
469 remove_thread (current_inferior
);
470 current_inferior
= (struct thread_info
*) all_threads
.head
;
472 /* If we were waiting for this particular child to do something...
473 well, it did something. */
477 /* Wait for a more interesting event. */
481 if (WIFSTOPPED (wstat
)
482 && WSTOPSIG (wstat
) == SIGSTOP
483 && event_child
->stop_expected
)
486 fprintf (stderr
, "Expected stop.\n");
487 event_child
->stop_expected
= 0;
488 linux_resume_one_process (&event_child
->head
,
489 event_child
->stepping
, 0);
493 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
495 if (WIFSTOPPED (wstat
)
496 && (WSTOPSIG (wstat
) == SIGRTMIN
497 || WSTOPSIG (wstat
) == SIGRTMIN
+ 1))
500 fprintf (stderr
, "Ignored signal %d for %d (LWP %d).\n",
501 WSTOPSIG (wstat
), event_child
->tid
,
502 event_child
->head
.id
);
503 linux_resume_one_process (&event_child
->head
,
504 event_child
->stepping
,
510 /* If this event was not handled above, and is not a SIGTRAP, report
512 if (!WIFSTOPPED (wstat
) || WSTOPSIG (wstat
) != SIGTRAP
)
515 /* If this target does not support breakpoints, we simply report the
516 SIGTRAP; it's of no concern to us. */
517 if (the_low_target
.get_pc
== NULL
)
520 stop_pc
= get_stop_pc ();
522 /* bp_reinsert will only be set if we were single-stepping.
523 Notice that we will resume the process after hitting
524 a gdbserver breakpoint; single-stepping to/over one
525 is not supported (yet). */
526 if (event_child
->bp_reinsert
!= 0)
529 fprintf (stderr
, "Reinserted breakpoint.\n");
530 reinsert_breakpoint (event_child
->bp_reinsert
);
531 event_child
->bp_reinsert
= 0;
533 /* Clear the single-stepping flag and SIGTRAP as we resume. */
534 linux_resume_one_process (&event_child
->head
, 0, 0);
539 fprintf (stderr
, "Hit a (non-reinsert) breakpoint.\n");
541 if (check_breakpoints (stop_pc
) != 0)
543 /* We hit one of our own breakpoints. We mark it as a pending
544 breakpoint, so that check_removed_breakpoints () will do the PC
545 adjustment for us at the appropriate time. */
546 event_child
->pending_is_breakpoint
= 1;
547 event_child
->pending_stop_pc
= stop_pc
;
549 /* Now we need to put the breakpoint back. We continue in the event
550 loop instead of simply replacing the breakpoint right away,
551 in order to not lose signals sent to the thread that hit the
552 breakpoint. Unfortunately this increases the window where another
553 thread could sneak past the removed breakpoint. For the current
554 use of server-side breakpoints (thread creation) this is
555 acceptable; but it needs to be considered before this breakpoint
556 mechanism can be used in more general ways. For some breakpoints
557 it may be necessary to stop all other threads, but that should
558 be avoided where possible.
560 If breakpoint_reinsert_addr is NULL, that means that we can
561 use PTRACE_SINGLESTEP on this platform. Uninsert the breakpoint,
562 mark it for reinsertion, and single-step.
564 Otherwise, call the target function to figure out where we need
565 our temporary breakpoint, create it, and continue executing this
567 if (the_low_target
.breakpoint_reinsert_addr
== NULL
)
569 event_child
->bp_reinsert
= stop_pc
;
570 uninsert_breakpoint (stop_pc
);
571 linux_resume_one_process (&event_child
->head
, 1, 0);
575 reinsert_breakpoint_by_bp
576 (stop_pc
, (*the_low_target
.breakpoint_reinsert_addr
) ());
577 linux_resume_one_process (&event_child
->head
, 0, 0);
583 /* If we were single-stepping, we definitely want to report the
584 SIGTRAP. The single-step operation has completed, so also
585 clear the stepping flag; in general this does not matter,
586 because the SIGTRAP will be reported to the client, which
587 will give us a new action for this thread, but clear it for
588 consistency anyway. It's safe to clear the stepping flag
589 because the only consumer of get_stop_pc () after this point
590 is check_removed_breakpoints, and pending_is_breakpoint is not
591 set. It might be wiser to use a step_completed flag instead. */
592 if (event_child
->stepping
)
594 event_child
->stepping
= 0;
598 /* A SIGTRAP that we can't explain. It may have been a breakpoint.
599 Check if it is a breakpoint, and if so mark the process information
600 accordingly. This will handle both the necessary fiddling with the
601 PC on decr_pc_after_break targets and suppressing extra threads
602 hitting a breakpoint if two hit it at once and then GDB removes it
603 after the first is reported. Arguably it would be better to report
604 multiple threads hitting breakpoints simultaneously, but the current
605 remote protocol does not allow this. */
606 if ((*the_low_target
.breakpoint_at
) (stop_pc
))
608 event_child
->pending_is_breakpoint
= 1;
609 event_child
->pending_stop_pc
= stop_pc
;
619 /* Wait for process, returns status. */
622 linux_wait (char *status
)
625 struct thread_info
*child
= NULL
;
628 /* If we were only supposed to resume one thread, only wait for
629 that thread - if it's still alive. If it died, however - which
630 can happen if we're coming from the thread death case below -
631 then we need to make sure we restart the other threads. We could
632 pick a thread at random or restart all; restarting all is less
636 child
= (struct thread_info
*) find_inferior_id (&all_threads
,
639 /* No stepping, no signal - unless one is pending already, of course. */
645 w
= linux_wait_for_event (child
);
646 stop_all_processes ();
649 /* If we are waiting for a particular child, and it exited,
650 linux_wait_for_event will return its exit status. Similarly if
651 the last child exited. If this is not the last child, however,
652 do not report it as exited until there is a 'thread exited' response
653 available in the remote protocol. Instead, just wait for another event.
654 This should be safe, because if the thread crashed we will already
655 have reported the termination signal to GDB; that should stop any
656 in-progress stepping operations, etc.
658 Report the exit status of the last thread to exit. This matches
659 LinuxThreads' behavior. */
661 if (all_threads
.head
== all_threads
.tail
)
665 fprintf (stderr
, "\nChild exited with retcode = %x \n", WEXITSTATUS (w
));
668 return ((unsigned char) WEXITSTATUS (w
));
670 else if (!WIFSTOPPED (w
))
672 fprintf (stderr
, "\nChild terminated with signal = %x \n", WTERMSIG (w
));
675 return ((unsigned char) WTERMSIG (w
));
685 return ((unsigned char) WSTOPSIG (w
));
689 send_sigstop (struct inferior_list_entry
*entry
)
691 struct process_info
*process
= (struct process_info
*) entry
;
693 if (process
->stopped
)
696 /* If we already have a pending stop signal for this process, don't
698 if (process
->stop_expected
)
700 process
->stop_expected
= 0;
705 fprintf (stderr
, "Sending sigstop to process %d\n", process
->head
.id
);
707 kill (process
->head
.id
, SIGSTOP
);
708 process
->sigstop_sent
= 1;
712 wait_for_sigstop (struct inferior_list_entry
*entry
)
714 struct process_info
*process
= (struct process_info
*) entry
;
715 struct thread_info
*saved_inferior
, *thread
;
716 int wstat
, saved_tid
;
718 if (process
->stopped
)
721 saved_inferior
= current_inferior
;
722 saved_tid
= ((struct inferior_list_entry
*) saved_inferior
)->id
;
723 thread
= (struct thread_info
*) find_inferior_id (&all_threads
,
725 wstat
= linux_wait_for_event (thread
);
727 /* If we stopped with a non-SIGSTOP signal, save it for later
728 and record the pending SIGSTOP. If the process exited, just
730 if (WIFSTOPPED (wstat
)
731 && WSTOPSIG (wstat
) != SIGSTOP
)
734 fprintf (stderr
, "Stopped with non-sigstop signal\n");
735 process
->status_pending_p
= 1;
736 process
->status_pending
= wstat
;
737 process
->stop_expected
= 1;
740 if (linux_thread_alive (saved_tid
))
741 current_inferior
= saved_inferior
;
745 fprintf (stderr
, "Previously current thread died.\n");
747 /* Set a valid thread as current. */
748 set_desired_inferior (0);
753 stop_all_processes (void)
755 stopping_threads
= 1;
756 for_each_inferior (&all_processes
, send_sigstop
);
757 for_each_inferior (&all_processes
, wait_for_sigstop
);
758 stopping_threads
= 0;
761 /* Resume execution of the inferior process.
762 If STEP is nonzero, single-step it.
763 If SIGNAL is nonzero, give it that signal. */
766 linux_resume_one_process (struct inferior_list_entry
*entry
,
767 int step
, int signal
)
769 struct process_info
*process
= (struct process_info
*) entry
;
770 struct thread_info
*saved_inferior
;
772 if (process
->stopped
== 0)
775 /* If we have pending signals or status, and a new signal, enqueue the
776 signal. Also enqueue the signal if we are waiting to reinsert a
777 breakpoint; it will be picked up again below. */
779 && (process
->status_pending_p
|| process
->pending_signals
!= NULL
780 || process
->bp_reinsert
!= 0))
782 struct pending_signals
*p_sig
;
783 p_sig
= malloc (sizeof (*p_sig
));
784 p_sig
->prev
= process
->pending_signals
;
785 p_sig
->signal
= signal
;
786 process
->pending_signals
= p_sig
;
789 if (process
->status_pending_p
)
792 saved_inferior
= current_inferior
;
793 current_inferior
= get_process_thread (process
);
796 fprintf (stderr
, "Resuming process %d (%s, signal %d, stop %s)\n", inferior_pid
,
797 step
? "step" : "continue", signal
,
798 process
->stop_expected
? "expected" : "not expected");
800 /* This bit needs some thinking about. If we get a signal that
801 we must report while a single-step reinsert is still pending,
802 we often end up resuming the thread. It might be better to
803 (ew) allow a stack of pending events; then we could be sure that
804 the reinsert happened right away and not lose any signals.
806 Making this stack would also shrink the window in which breakpoints are
807 uninserted (see comment in linux_wait_for_process) but not enough for
808 complete correctness, so it won't solve that problem. It may be
809 worthwhile just to solve this one, however. */
810 if (process
->bp_reinsert
!= 0)
813 fprintf (stderr
, " pending reinsert at %08lx", (long)process
->bp_reinsert
);
815 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
818 /* Postpone any pending signal. It was enqueued above. */
822 check_removed_breakpoint (process
);
824 if (debug_threads
&& the_low_target
.get_pc
!= NULL
)
826 fprintf (stderr
, " ");
827 (long) (*the_low_target
.get_pc
) ();
830 /* If we have pending signals, consume one unless we are trying to reinsert
832 if (process
->pending_signals
!= NULL
&& process
->bp_reinsert
== 0)
834 struct pending_signals
**p_sig
;
836 p_sig
= &process
->pending_signals
;
837 while ((*p_sig
)->prev
!= NULL
)
838 p_sig
= &(*p_sig
)->prev
;
840 signal
= (*p_sig
)->signal
;
845 regcache_invalidate_one ((struct inferior_list_entry
*)
846 get_process_thread (process
));
848 process
->stopped
= 0;
849 process
->stepping
= step
;
850 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, process
->lwpid
, 0, signal
);
852 current_inferior
= saved_inferior
;
854 perror_with_name ("ptrace");
857 /* This function is called once per process other than the first
858 one. The first process we are told the signal to continue
859 with, and whether to step or continue; for all others, any
860 existing signals will be marked in status_pending_p to be
861 reported momentarily, and we preserve the stepping flag. */
863 linux_continue_one_process (struct inferior_list_entry
*entry
)
865 struct process_info
*process
;
867 process
= (struct process_info
*) entry
;
868 linux_resume_one_process (entry
, process
->stepping
, 0);
872 linux_resume (int step
, int signal
)
874 struct process_info
*process
;
876 process
= get_thread_process (current_inferior
);
878 /* If the current process has a status pending, this signal will
879 be enqueued and sent later. */
880 linux_resume_one_process (&process
->head
, step
, signal
);
882 if (cont_thread
== 0 || cont_thread
== -1)
883 for_each_inferior (&all_processes
, linux_continue_one_process
);
886 #ifdef HAVE_LINUX_USRREGS
889 register_addr (int regnum
)
893 if (regnum
< 0 || regnum
>= the_low_target
.num_regs
)
894 error ("Invalid register number %d.", regnum
);
896 addr
= the_low_target
.regmap
[regnum
];
901 /* Fetch one register. */
903 fetch_register (int regno
)
909 if (regno
>= the_low_target
.num_regs
)
911 if ((*the_low_target
.cannot_fetch_register
) (regno
))
914 regaddr
= register_addr (regno
);
917 buf
= alloca (register_size (regno
));
918 for (i
= 0; i
< register_size (regno
); i
+= sizeof (PTRACE_XFER_TYPE
))
921 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
922 ptrace (PTRACE_PEEKUSER
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
, 0);
923 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
926 /* Warning, not error, in case we are attached; sometimes the
927 kernel doesn't let us at the registers. */
928 char *err
= strerror (errno
);
929 char *msg
= alloca (strlen (err
) + 128);
930 sprintf (msg
, "reading register %d: %s", regno
, err
);
935 supply_register (regno
, buf
);
940 /* Fetch all registers, or just one, from the child process. */
942 usr_fetch_inferior_registers (int regno
)
944 if (regno
== -1 || regno
== 0)
945 for (regno
= 0; regno
< the_low_target
.num_regs
; regno
++)
946 fetch_register (regno
);
948 fetch_register (regno
);
951 /* Store our register values back into the inferior.
952 If REGNO is -1, do this for all registers.
953 Otherwise, REGNO specifies which register (so we can save time). */
955 usr_store_inferior_registers (int regno
)
963 if (regno
>= the_low_target
.num_regs
)
966 if ((*the_low_target
.cannot_store_register
) (regno
) == 1)
969 regaddr
= register_addr (regno
);
973 buf
= alloca (register_size (regno
));
974 collect_register (regno
, buf
);
975 for (i
= 0; i
< register_size (regno
); i
+= sizeof (PTRACE_XFER_TYPE
))
978 ptrace (PTRACE_POKEUSER
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
982 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
984 char *err
= strerror (errno
);
985 char *msg
= alloca (strlen (err
) + 128);
986 sprintf (msg
, "writing register %d: %s",
992 regaddr
+= sizeof (int);
996 for (regno
= 0; regno
< the_low_target
.num_regs
; regno
++)
997 usr_store_inferior_registers (regno
);
999 #endif /* HAVE_LINUX_USRREGS */
1003 #ifdef HAVE_LINUX_REGSETS
1006 regsets_fetch_inferior_registers ()
1008 struct regset_info
*regset
;
1010 regset
= target_regsets
;
1012 while (regset
->size
>= 0)
1017 if (regset
->size
== 0)
1023 buf
= malloc (regset
->size
);
1024 res
= ptrace (regset
->get_request
, inferior_pid
, 0, buf
);
1029 /* If we get EIO on the first regset, do not try regsets again.
1030 If we get EIO on a later regset, disable that regset. */
1031 if (regset
== target_regsets
)
1045 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
1050 regset
->store_function (buf
);
1057 regsets_store_inferior_registers ()
1059 struct regset_info
*regset
;
1061 regset
= target_regsets
;
1063 while (regset
->size
>= 0)
1068 if (regset
->size
== 0)
1074 buf
= malloc (regset
->size
);
1075 regset
->fill_function (buf
);
1076 res
= ptrace (regset
->set_request
, inferior_pid
, 0, buf
);
1081 /* If we get EIO on the first regset, do not try regsets again.
1082 If we get EIO on a later regset, disable that regset. */
1083 if (regset
== target_regsets
)
1096 perror ("Warning: ptrace(regsets_store_inferior_registers)");
1105 #endif /* HAVE_LINUX_REGSETS */
1109 linux_fetch_registers (int regno
)
1111 #ifdef HAVE_LINUX_REGSETS
1114 if (regsets_fetch_inferior_registers () == 0)
1118 #ifdef HAVE_LINUX_USRREGS
1119 usr_fetch_inferior_registers (regno
);
1124 linux_store_registers (int regno
)
1126 #ifdef HAVE_LINUX_REGSETS
1129 if (regsets_store_inferior_registers () == 0)
1133 #ifdef HAVE_LINUX_USRREGS
1134 usr_store_inferior_registers (regno
);
1139 /* Copy LEN bytes from inferior's memory starting at MEMADDR
1140 to debugger memory starting at MYADDR. */
1143 linux_read_memory (CORE_ADDR memaddr
, char *myaddr
, int len
)
1146 /* Round starting address down to longword boundary. */
1147 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
1148 /* Round ending address up; get number of longwords that makes. */
1150 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
1151 / sizeof (PTRACE_XFER_TYPE
);
1152 /* Allocate buffer of that many longwords. */
1153 register PTRACE_XFER_TYPE
*buffer
1154 = (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
1156 /* Read all the longwords */
1157 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
1159 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, inferior_pid
, (PTRACE_ARG3_TYPE
) addr
, 0);
1162 /* Copy appropriate bytes out of the buffer. */
1163 memcpy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)), len
);
1166 /* Copy LEN bytes of data from debugger memory at MYADDR
1167 to inferior's memory at MEMADDR.
1168 On failure (cannot write the inferior)
1169 returns the value of errno. */
1172 linux_write_memory (CORE_ADDR memaddr
, const char *myaddr
, int len
)
1175 /* Round starting address down to longword boundary. */
1176 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
1177 /* Round ending address up; get number of longwords that makes. */
1179 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1) / sizeof (PTRACE_XFER_TYPE
);
1180 /* Allocate buffer of that many longwords. */
1181 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
1186 fprintf (stderr
, "Writing %02x to %08lx\n", (unsigned)myaddr
[0], (long)memaddr
);
1189 /* Fill start and end extra bytes of buffer with existing memory data. */
1191 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, inferior_pid
,
1192 (PTRACE_ARG3_TYPE
) addr
, 0);
1197 = ptrace (PTRACE_PEEKTEXT
, inferior_pid
,
1198 (PTRACE_ARG3_TYPE
) (addr
+ (count
- 1)
1199 * sizeof (PTRACE_XFER_TYPE
)),
1203 /* Copy data to be written over corresponding part of buffer */
1205 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)), myaddr
, len
);
1207 /* Write the entire buffer. */
1209 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
1212 ptrace (PTRACE_POKETEXT
, inferior_pid
, (PTRACE_ARG3_TYPE
) addr
, buffer
[i
]);
1221 linux_look_up_symbols (void)
1223 #ifdef USE_THREAD_DB
1227 using_threads
= thread_db_init ();
1232 static struct target_ops linux_target_ops
= {
1233 linux_create_inferior
,
1239 linux_fetch_registers
,
1240 linux_store_registers
,
1243 linux_look_up_symbols
,
1247 linux_init_signals ()
1249 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
1250 to find what the cancel signal actually is. */
1251 signal (SIGRTMIN
+1, SIG_IGN
);
1255 initialize_low (void)
1258 set_target_ops (&linux_target_ops
);
1259 set_breakpoint_data (the_low_target
.breakpoint
,
1260 the_low_target
.breakpoint_len
);
1262 linux_init_signals ();