1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
3 2006, 2007, 2008, 2009 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 3 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, see <http://www.gnu.org/licenses/>. */
21 #include "linux-low.h"
22 #include "ansidecl.h" /* For ATTRIBUTE_PACKED, must be bug in external.h. */
23 #include "elf/common.h"
24 #include "elf/external.h"
28 #include <sys/param.h>
29 #include <sys/ptrace.h>
31 #include <sys/ioctl.h>
37 #include <sys/syscall.h>
41 #include <sys/types.h>
47 #define SPUFS_MAGIC 0x23c9b64e
50 #ifndef PTRACE_GETSIGINFO
51 # define PTRACE_GETSIGINFO 0x4202
52 # define PTRACE_SETSIGINFO 0x4203
59 /* If the system headers did not provide the constants, hard-code the normal
61 #ifndef PTRACE_EVENT_FORK
63 #define PTRACE_SETOPTIONS 0x4200
64 #define PTRACE_GETEVENTMSG 0x4201
66 /* options set using PTRACE_SETOPTIONS */
67 #define PTRACE_O_TRACESYSGOOD 0x00000001
68 #define PTRACE_O_TRACEFORK 0x00000002
69 #define PTRACE_O_TRACEVFORK 0x00000004
70 #define PTRACE_O_TRACECLONE 0x00000008
71 #define PTRACE_O_TRACEEXEC 0x00000010
72 #define PTRACE_O_TRACEVFORKDONE 0x00000020
73 #define PTRACE_O_TRACEEXIT 0x00000040
75 /* Wait extended result codes for the above trace options. */
76 #define PTRACE_EVENT_FORK 1
77 #define PTRACE_EVENT_VFORK 2
78 #define PTRACE_EVENT_CLONE 3
79 #define PTRACE_EVENT_EXEC 4
80 #define PTRACE_EVENT_VFORK_DONE 5
81 #define PTRACE_EVENT_EXIT 6
83 #endif /* PTRACE_EVENT_FORK */
85 /* We can't always assume that this flag is available, but all systems
86 with the ptrace event handlers also have __WALL, so it's safe to use
89 #define __WALL 0x40000000 /* Wait for any child. */
93 #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__))
98 /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol
99 representation of the thread ID.
101 ``all_lwps'' is keyed by the process ID - which on Linux is (presently)
102 the same as the LWP ID.
104 ``all_processes'' is keyed by the "overall process ID", which
105 GNU/Linux calls tgid, "thread group ID". */
107 struct inferior_list all_lwps;
109 /* A list of all unknown processes which receive stop signals. Some other
110 process will presumably claim each of these as forked children
113 struct inferior_list stopped_pids;
115 /* FIXME this is a bit of a hack, and could be removed. */
116 int stopping_threads;
118 /* FIXME make into a target method? */
119 int using_threads = 1;
121 /* This flag is true iff we've just created or attached to our first
122 inferior but it has not stopped yet. As soon as it does, we need
123 to call the low target's arch_setup callback. Doing this only on
124 the first inferior avoids reinializing the architecture on every
125 inferior, and avoids messing with the register caches of the
126 already running inferiors. NOTE: this assumes all inferiors under
127 control of gdbserver have the same architecture. */
128 static int new_inferior;
130 static void linux_resume_one_lwp (struct lwp_info *lwp,
131 int step, int signal, siginfo_t *info);
132 static void linux_resume (struct thread_resume *resume_info, size_t n);
133 static void stop_all_lwps (void);
134 static int linux_wait_for_event (ptid_t ptid, int *wstat, int options);
135 static int check_removed_breakpoint (struct lwp_info *event_child);
136 static void *add_lwp (ptid_t ptid);
137 static int linux_stopped_by_watchpoint (void);
138 static void mark_lwp_dead (struct lwp_info *lwp, int wstat);
140 struct pending_signals
144 struct pending_signals *prev;
147 #define PTRACE_ARG3_TYPE long
148 #define PTRACE_XFER_TYPE long
150 #ifdef HAVE_LINUX_REGSETS
151 static char *disabled_regsets;
152 static int num_regsets;
155 /* The read/write ends of the pipe registered as waitable file in the
157 static int linux_event_pipe[2] = { -1, -1 };
159 /* True if we're currently in async mode. */
160 #define target_is_async_p() (linux_event_pipe[0] != -1)
162 static void send_sigstop (struct inferior_list_entry *entry);
163 static void wait_for_sigstop (struct inferior_list_entry *entry);
165 /* Accepts an integer PID; Returns a string representing a file that
166 can be opened to get info for the child process.
167 Space for the result is malloc'd, caller must free. */
170 linux_child_pid_to_exec_file (int pid)
174 name1 = xmalloc (MAXPATHLEN);
175 name2 = xmalloc (MAXPATHLEN);
176 memset (name2, 0, MAXPATHLEN);
178 sprintf (name1, "/proc/%d/exe", pid);
179 if (readlink (name1, name2, MAXPATHLEN) > 0)
191 /* Return non-zero if HEADER is a 64-bit ELF file. */
194 elf_64_header_p (const Elf64_External_Ehdr *header)
196 return (header->e_ident[EI_MAG0] == ELFMAG0
197 && header->e_ident[EI_MAG1] == ELFMAG1
198 && header->e_ident[EI_MAG2] == ELFMAG2
199 && header->e_ident[EI_MAG3] == ELFMAG3
200 && header->e_ident[EI_CLASS] == ELFCLASS64);
203 /* Return non-zero if FILE is a 64-bit ELF file,
204 zero if the file is not a 64-bit ELF file,
205 and -1 if the file is not accessible or doesn't exist. */
208 elf_64_file_p (const char *file)
210 Elf64_External_Ehdr header;
213 fd = open (file, O_RDONLY);
217 if (read (fd, &header, sizeof (header)) != sizeof (header))
224 return elf_64_header_p (&header);
228 delete_lwp (struct lwp_info *lwp)
230 remove_thread (get_lwp_thread (lwp));
231 remove_inferior (&all_lwps, &lwp->head);
232 free (lwp->arch_private);
236 /* Add a process to the common process list, and set its private
239 static struct process_info *
240 linux_add_process (int pid, int attached)
242 struct process_info *proc;
244 /* Is this the first process? If so, then set the arch. */
245 if (all_processes.head == NULL)
248 proc = add_process (pid, attached);
249 proc->private = xcalloc (1, sizeof (*proc->private));
251 if (the_low_target.new_process != NULL)
252 proc->private->arch_private = the_low_target.new_process ();
257 /* Remove a process from the common process list,
258 also freeing all private data. */
261 linux_remove_process (struct process_info *process)
263 struct process_info_private *priv = process->private;
265 free (priv->arch_private);
267 remove_process (process);
270 /* Wrapper function for waitpid which handles EINTR, and emulates
271 __WALL for systems where that is not available. */
274 my_waitpid (int pid, int *status, int flags)
279 fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags);
283 sigset_t block_mask, org_mask, wake_mask;
286 wnohang = (flags & WNOHANG) != 0;
287 flags &= ~(__WALL | __WCLONE);
290 /* Block all signals while here. This avoids knowing about
291 LinuxThread's signals. */
292 sigfillset (&block_mask);
293 sigprocmask (SIG_BLOCK, &block_mask, &org_mask);
295 /* ... except during the sigsuspend below. */
296 sigemptyset (&wake_mask);
300 /* Since all signals are blocked, there's no need to check
302 ret = waitpid (pid, status, flags);
305 if (ret == -1 && out_errno != ECHILD)
310 if (flags & __WCLONE)
312 /* We've tried both flavors now. If WNOHANG is set,
313 there's nothing else to do, just bail out. */
318 fprintf (stderr, "blocking\n");
320 /* Block waiting for signals. */
321 sigsuspend (&wake_mask);
327 sigprocmask (SIG_SETMASK, &org_mask, NULL);
332 ret = waitpid (pid, status, flags);
333 while (ret == -1 && errno == EINTR);
338 fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n",
339 pid, flags, status ? *status : -1, ret);
345 /* Handle a GNU/Linux extended wait response. If we see a clone
346 event, we need to add the new LWP to our list (and not report the
347 trap to higher layers). */
350 handle_extended_wait (struct lwp_info *event_child, int wstat)
352 int event = wstat >> 16;
353 struct lwp_info *new_lwp;
355 if (event == PTRACE_EVENT_CLONE)
358 unsigned long new_pid;
359 int ret, status = W_STOPCODE (SIGSTOP);
361 ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid);
363 /* If we haven't already seen the new PID stop, wait for it now. */
364 if (! pull_pid_from_list (&stopped_pids, new_pid))
366 /* The new child has a pending SIGSTOP. We can't affect it until it
367 hits the SIGSTOP, but we're already attached. */
369 ret = my_waitpid (new_pid, &status, __WALL);
372 perror_with_name ("waiting for new child");
373 else if (ret != new_pid)
374 warning ("wait returned unexpected PID %d", ret);
375 else if (!WIFSTOPPED (status))
376 warning ("wait returned unexpected status 0x%x", status);
379 ptrace (PTRACE_SETOPTIONS, new_pid, 0, PTRACE_O_TRACECLONE);
381 ptid = ptid_build (pid_of (event_child), new_pid, 0);
382 new_lwp = (struct lwp_info *) add_lwp (ptid);
383 add_thread (ptid, new_lwp);
385 /* Either we're going to immediately resume the new thread
386 or leave it stopped. linux_resume_one_lwp is a nop if it
387 thinks the thread is currently running, so set this first
388 before calling linux_resume_one_lwp. */
389 new_lwp->stopped = 1;
391 /* Normally we will get the pending SIGSTOP. But in some cases
392 we might get another signal delivered to the group first.
393 If we do get another signal, be sure not to lose it. */
394 if (WSTOPSIG (status) == SIGSTOP)
396 if (! stopping_threads)
397 linux_resume_one_lwp (new_lwp, 0, 0, NULL);
401 new_lwp->stop_expected = 1;
402 if (stopping_threads)
404 new_lwp->status_pending_p = 1;
405 new_lwp->status_pending = status;
408 /* Pass the signal on. This is what GDB does - except
409 shouldn't we really report it instead? */
410 linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL);
413 /* Always resume the current thread. If we are stopping
414 threads, it will have a pending SIGSTOP; we may as well
416 linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL);
420 /* This function should only be called if the process got a SIGTRAP.
421 The SIGTRAP could mean several things.
423 On i386, where decr_pc_after_break is non-zero:
424 If we were single-stepping this process using PTRACE_SINGLESTEP,
425 we will get only the one SIGTRAP (even if the instruction we
426 stepped over was a breakpoint). The value of $eip will be the
428 If we continue the process using PTRACE_CONT, we will get a
429 SIGTRAP when we hit a breakpoint. The value of $eip will be
430 the instruction after the breakpoint (i.e. needs to be
431 decremented). If we report the SIGTRAP to GDB, we must also
432 report the undecremented PC. If we cancel the SIGTRAP, we
433 must resume at the decremented PC.
435 (Presumably, not yet tested) On a non-decr_pc_after_break machine
436 with hardware or kernel single-step:
437 If we single-step over a breakpoint instruction, our PC will
438 point at the following instruction. If we continue and hit a
439 breakpoint instruction, our PC will point at the breakpoint
445 CORE_ADDR stop_pc = (*the_low_target.get_pc) ();
447 if (! get_thread_lwp (current_inferior)->stepping)
448 stop_pc -= the_low_target.decr_pc_after_break;
451 fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc);
457 add_lwp (ptid_t ptid)
459 struct lwp_info *lwp;
461 lwp = (struct lwp_info *) xmalloc (sizeof (*lwp));
462 memset (lwp, 0, sizeof (*lwp));
466 if (the_low_target.new_thread != NULL)
467 lwp->arch_private = the_low_target.new_thread ();
469 add_inferior_to_list (&all_lwps, &lwp->head);
474 /* Start an inferior process and returns its pid.
475 ALLARGS is a vector of program-name and args. */
478 linux_create_inferior (char *program, char **allargs)
480 struct lwp_info *new_lwp;
484 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
490 perror_with_name ("fork");
494 ptrace (PTRACE_TRACEME, 0, 0, 0);
496 signal (__SIGRTMIN + 1, SIG_DFL);
500 execv (program, allargs);
502 execvp (program, allargs);
504 fprintf (stderr, "Cannot exec %s: %s.\n", program,
510 linux_add_process (pid, 0);
512 ptid = ptid_build (pid, pid, 0);
513 new_lwp = add_lwp (ptid);
514 add_thread (ptid, new_lwp);
515 new_lwp->must_set_ptrace_flags = 1;
520 /* Attach to an inferior process. */
523 linux_attach_lwp_1 (unsigned long lwpid, int initial)
526 struct lwp_info *new_lwp;
528 if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0)
532 /* If we fail to attach to an LWP, just warn. */
533 fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid,
534 strerror (errno), errno);
539 /* If we fail to attach to a process, report an error. */
540 error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid,
541 strerror (errno), errno);
545 /* NOTE/FIXME: This lwp might have not been the tgid. */
546 ptid = ptid_build (lwpid, lwpid, 0);
549 /* Note that extracting the pid from the current inferior is
550 safe, since we're always called in the context of the same
551 process as this new thread. */
552 int pid = pid_of (get_thread_lwp (current_inferior));
553 ptid = ptid_build (pid, lwpid, 0);
556 new_lwp = (struct lwp_info *) add_lwp (ptid);
557 add_thread (ptid, new_lwp);
559 /* We need to wait for SIGSTOP before being able to make the next
560 ptrace call on this LWP. */
561 new_lwp->must_set_ptrace_flags = 1;
563 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
566 There are several cases to consider here:
568 1) gdbserver has already attached to the process and is being notified
569 of a new thread that is being created.
570 In this case we should ignore that SIGSTOP and resume the process.
571 This is handled below by setting stop_expected = 1.
573 2) This is the first thread (the process thread), and we're attaching
574 to it via attach_inferior.
575 In this case we want the process thread to stop.
576 This is handled by having linux_attach clear stop_expected after
578 ??? If the process already has several threads we leave the other
581 3) GDB is connecting to gdbserver and is requesting an enumeration of all
583 In this case we want the thread to stop.
584 FIXME: This case is currently not properly handled.
585 We should wait for the SIGSTOP but don't. Things work apparently
586 because enough time passes between when we ptrace (ATTACH) and when
587 gdb makes the next ptrace call on the thread.
589 On the other hand, if we are currently trying to stop all threads, we
590 should treat the new thread as if we had sent it a SIGSTOP. This works
591 because we are guaranteed that the add_lwp call above added us to the
592 end of the list, and so the new thread has not yet reached
593 wait_for_sigstop (but will). */
594 if (! stopping_threads)
595 new_lwp->stop_expected = 1;
599 linux_attach_lwp (unsigned long lwpid)
601 linux_attach_lwp_1 (lwpid, 0);
605 linux_attach (unsigned long pid)
607 struct lwp_info *lwp;
609 linux_attach_lwp_1 (pid, 1);
611 linux_add_process (pid, 1);
615 /* Don't ignore the initial SIGSTOP if we just attached to this
616 process. It will be collected by wait shortly. */
617 lwp = (struct lwp_info *) find_inferior_id (&all_lwps,
618 ptid_build (pid, pid, 0));
619 lwp->stop_expected = 0;
632 second_thread_of_pid_p (struct inferior_list_entry *entry, void *args)
634 struct counter *counter = args;
636 if (ptid_get_pid (entry->id) == counter->pid)
638 if (++counter->count > 1)
646 last_thread_of_process_p (struct thread_info *thread)
648 ptid_t ptid = ((struct inferior_list_entry *)thread)->id;
649 int pid = ptid_get_pid (ptid);
650 struct counter counter = { pid , 0 };
652 return (find_inferior (&all_threads,
653 second_thread_of_pid_p, &counter) == NULL);
656 /* Kill the inferior lwp. */
659 linux_kill_one_lwp (struct inferior_list_entry *entry, void *args)
661 struct thread_info *thread = (struct thread_info *) entry;
662 struct lwp_info *lwp = get_thread_lwp (thread);
664 int pid = * (int *) args;
666 if (ptid_get_pid (entry->id) != pid)
669 /* We avoid killing the first thread here, because of a Linux kernel (at
670 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
671 the children get a chance to be reaped, it will remain a zombie
674 if (lwpid_of (lwp) == pid)
677 fprintf (stderr, "lkop: is last of process %s\n",
678 target_pid_to_str (entry->id));
682 /* If we're killing a running inferior, make sure it is stopped
683 first, as PTRACE_KILL will not work otherwise. */
685 send_sigstop (&lwp->head);
689 ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0);
691 /* Make sure it died. The loop is most likely unnecessary. */
692 pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL);
693 } while (pid > 0 && WIFSTOPPED (wstat));
701 struct process_info *process;
702 struct lwp_info *lwp;
703 struct thread_info *thread;
707 process = find_process_pid (pid);
711 find_inferior (&all_threads, linux_kill_one_lwp, &pid);
713 /* See the comment in linux_kill_one_lwp. We did not kill the first
714 thread in the list, so do so now. */
715 lwp = find_lwp_pid (pid_to_ptid (pid));
716 thread = get_lwp_thread (lwp);
719 fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n",
720 lwpid_of (lwp), pid);
722 /* If we're killing a running inferior, make sure it is stopped
723 first, as PTRACE_KILL will not work otherwise. */
725 send_sigstop (&lwp->head);
729 ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0);
731 /* Make sure it died. The loop is most likely unnecessary. */
732 lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL);
733 } while (lwpid > 0 && WIFSTOPPED (wstat));
736 thread_db_free (process, 0);
739 linux_remove_process (process);
744 linux_detach_one_lwp (struct inferior_list_entry *entry, void *args)
746 struct thread_info *thread = (struct thread_info *) entry;
747 struct lwp_info *lwp = get_thread_lwp (thread);
748 int pid = * (int *) args;
750 if (ptid_get_pid (entry->id) != pid)
753 /* If we're detaching from a running inferior, make sure it is
754 stopped first, as PTRACE_DETACH will not work otherwise. */
757 int lwpid = lwpid_of (lwp);
759 stopping_threads = 1;
760 send_sigstop (&lwp->head);
762 /* If this detects a new thread through a clone event, the new
763 thread is appended to the end of the lwp list, so we'll
764 eventually detach from it. */
765 wait_for_sigstop (&lwp->head);
766 stopping_threads = 0;
768 /* If LWP exits while we're trying to stop it, there's nothing
770 lwp = find_lwp_pid (pid_to_ptid (lwpid));
775 /* Make sure the process isn't stopped at a breakpoint that's
777 check_removed_breakpoint (lwp);
779 /* If this process is stopped but is expecting a SIGSTOP, then make
780 sure we take care of that now. This isn't absolutely guaranteed
781 to collect the SIGSTOP, but is fairly likely to. */
782 if (lwp->stop_expected)
785 /* Clear stop_expected, so that the SIGSTOP will be reported. */
786 lwp->stop_expected = 0;
788 linux_resume_one_lwp (lwp, 0, 0, NULL);
789 linux_wait_for_event (lwp->head.id, &wstat, __WALL);
792 /* Flush any pending changes to the process's registers. */
793 regcache_invalidate_one ((struct inferior_list_entry *)
794 get_lwp_thread (lwp));
796 /* Finally, let it resume. */
797 ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0);
804 any_thread_of (struct inferior_list_entry *entry, void *args)
808 if (ptid_get_pid (entry->id) == *pid_p)
815 linux_detach (int pid)
817 struct process_info *process;
819 process = find_process_pid (pid);
824 thread_db_free (process, 1);
828 (struct thread_info *) find_inferior (&all_threads, any_thread_of, &pid);
830 delete_all_breakpoints ();
831 find_inferior (&all_threads, linux_detach_one_lwp, &pid);
832 linux_remove_process (process);
840 struct process_info *process;
842 process = find_process_pid (pid);
847 ret = my_waitpid (pid, &status, 0);
848 if (WIFEXITED (status) || WIFSIGNALED (status))
850 } while (ret != -1 || errno != ECHILD);
853 /* Return nonzero if the given thread is still alive. */
855 linux_thread_alive (ptid_t ptid)
857 struct lwp_info *lwp = find_lwp_pid (ptid);
859 /* We assume we always know if a thread exits. If a whole process
860 exited but we still haven't been able to report it to GDB, we'll
861 hold on to the last lwp of the dead process. */
868 /* Return nonzero if this process stopped at a breakpoint which
869 no longer appears to be inserted. Also adjust the PC
870 appropriately to resume where the breakpoint used to be. */
872 check_removed_breakpoint (struct lwp_info *event_child)
875 struct thread_info *saved_inferior;
877 if (event_child->pending_is_breakpoint == 0)
881 fprintf (stderr, "Checking for breakpoint in lwp %ld.\n",
882 lwpid_of (event_child));
884 saved_inferior = current_inferior;
885 current_inferior = get_lwp_thread (event_child);
887 stop_pc = get_stop_pc ();
889 /* If the PC has changed since we stopped, then we shouldn't do
890 anything. This happens if, for instance, GDB handled the
891 decr_pc_after_break subtraction itself. */
892 if (stop_pc != event_child->pending_stop_pc)
895 fprintf (stderr, "Ignoring, PC was changed. Old PC was 0x%08llx\n",
896 event_child->pending_stop_pc);
898 event_child->pending_is_breakpoint = 0;
899 current_inferior = saved_inferior;
903 /* If the breakpoint is still there, we will report hitting it. */
904 if ((*the_low_target.breakpoint_at) (stop_pc))
907 fprintf (stderr, "Ignoring, breakpoint is still present.\n");
908 current_inferior = saved_inferior;
913 fprintf (stderr, "Removed breakpoint.\n");
915 /* For decr_pc_after_break targets, here is where we perform the
916 decrement. We go immediately from this function to resuming,
917 and can not safely call get_stop_pc () again. */
918 if (the_low_target.set_pc != NULL)
921 fprintf (stderr, "Set pc to 0x%lx\n", (long) stop_pc);
922 (*the_low_target.set_pc) (stop_pc);
925 /* We consumed the pending SIGTRAP. */
926 event_child->pending_is_breakpoint = 0;
927 event_child->status_pending_p = 0;
928 event_child->status_pending = 0;
930 current_inferior = saved_inferior;
934 /* Return 1 if this lwp has an interesting status pending. This
935 function may silently resume an inferior lwp. */
937 status_pending_p (struct inferior_list_entry *entry, void *arg)
939 struct lwp_info *lwp = (struct lwp_info *) entry;
940 ptid_t ptid = * (ptid_t *) arg;
942 /* Check if we're only interested in events from a specific process
944 if (!ptid_equal (minus_one_ptid, ptid)
945 && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id))
948 if (lwp->status_pending_p && !lwp->suspended)
949 if (check_removed_breakpoint (lwp))
951 /* This thread was stopped at a breakpoint, and the breakpoint
952 is now gone. We were told to continue (or step...) all threads,
953 so GDB isn't trying to single-step past this breakpoint.
954 So instead of reporting the old SIGTRAP, pretend we got to
955 the breakpoint just after it was removed instead of just
956 before; resume the process. */
957 linux_resume_one_lwp (lwp, 0, 0, NULL);
961 return (lwp->status_pending_p && !lwp->suspended);
965 same_lwp (struct inferior_list_entry *entry, void *data)
967 ptid_t ptid = *(ptid_t *) data;
970 if (ptid_get_lwp (ptid) != 0)
971 lwp = ptid_get_lwp (ptid);
973 lwp = ptid_get_pid (ptid);
975 if (ptid_get_lwp (entry->id) == lwp)
982 find_lwp_pid (ptid_t ptid)
984 return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid);
987 static struct lwp_info *
988 linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options)
991 int to_wait_for = -1;
992 struct lwp_info *child = NULL;
995 fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid));
997 if (ptid_equal (ptid, minus_one_ptid))
998 to_wait_for = -1; /* any child */
1000 to_wait_for = ptid_get_lwp (ptid); /* this lwp only */
1006 ret = my_waitpid (to_wait_for, wstatp, options);
1007 if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG)))
1010 perror_with_name ("waitpid");
1013 && (!WIFSTOPPED (*wstatp)
1014 || (WSTOPSIG (*wstatp) != 32
1015 && WSTOPSIG (*wstatp) != 33)))
1016 fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp);
1018 child = find_lwp_pid (pid_to_ptid (ret));
1020 /* If we didn't find a process, one of two things presumably happened:
1021 - A process we started and then detached from has exited. Ignore it.
1022 - A process we are controlling has forked and the new child's stop
1023 was reported to us by the kernel. Save its PID. */
1024 if (child == NULL && WIFSTOPPED (*wstatp))
1026 add_pid_to_list (&stopped_pids, ret);
1029 else if (child == NULL)
1033 child->pending_is_breakpoint = 0;
1035 child->last_status = *wstatp;
1037 /* Architecture-specific setup after inferior is running.
1038 This needs to happen after we have attached to the inferior
1039 and it is stopped for the first time, but before we access
1040 any inferior registers. */
1043 the_low_target.arch_setup ();
1044 #ifdef HAVE_LINUX_REGSETS
1045 memset (disabled_regsets, 0, num_regsets);
1051 && WIFSTOPPED (*wstatp)
1052 && the_low_target.get_pc != NULL)
1054 struct thread_info *saved_inferior = current_inferior;
1057 current_inferior = (struct thread_info *)
1058 find_inferior_id (&all_threads, child->head.id);
1059 pc = (*the_low_target.get_pc) ();
1060 fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc);
1061 current_inferior = saved_inferior;
1067 /* Wait for an event from child PID. If PID is -1, wait for any
1068 child. Store the stop status through the status pointer WSTAT.
1069 OPTIONS is passed to the waitpid call. Return 0 if no child stop
1070 event was found and OPTIONS contains WNOHANG. Return the PID of
1071 the stopped child otherwise. */
1074 linux_wait_for_event_1 (ptid_t ptid, int *wstat, int options)
1077 struct lwp_info *event_child = NULL;
1079 struct lwp_info *requested_child = NULL;
1081 /* Check for a lwp with a pending status. */
1082 /* It is possible that the user changed the pending task's registers since
1083 it stopped. We correctly handle the change of PC if we hit a breakpoint
1084 (in check_removed_breakpoint); signals should be reported anyway. */
1086 if (ptid_equal (ptid, minus_one_ptid)
1087 || ptid_equal (pid_to_ptid (ptid_get_pid (ptid)), ptid))
1089 event_child = (struct lwp_info *)
1090 find_inferior (&all_lwps, status_pending_p, &ptid);
1091 if (debug_threads && event_child)
1092 fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child));
1096 requested_child = find_lwp_pid (ptid);
1097 if (requested_child->status_pending_p
1098 && !check_removed_breakpoint (requested_child))
1099 event_child = requested_child;
1102 if (event_child != NULL)
1105 fprintf (stderr, "Got an event from pending child %ld (%04x)\n",
1106 lwpid_of (event_child), event_child->status_pending);
1107 *wstat = event_child->status_pending;
1108 event_child->status_pending_p = 0;
1109 event_child->status_pending = 0;
1110 current_inferior = get_lwp_thread (event_child);
1111 return lwpid_of (event_child);
1114 /* We only enter this loop if no process has a pending wait status. Thus
1115 any action taken in response to a wait status inside this loop is
1116 responding as soon as we detect the status, not after any pending
1120 event_child = linux_wait_for_lwp (ptid, wstat, options);
1122 if ((options & WNOHANG) && event_child == NULL)
1125 if (event_child == NULL)
1126 error ("event from unknown child");
1128 current_inferior = get_lwp_thread (event_child);
1130 /* Check for thread exit. */
1131 if (! WIFSTOPPED (*wstat))
1134 fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child));
1136 /* If the last thread is exiting, just return. */
1137 if (last_thread_of_process_p (current_inferior))
1140 fprintf (stderr, "LWP %ld is last lwp of process\n",
1141 lwpid_of (event_child));
1142 return lwpid_of (event_child);
1145 delete_lwp (event_child);
1149 current_inferior = (struct thread_info *) all_threads.head;
1151 fprintf (stderr, "Current inferior is now %ld\n",
1152 lwpid_of (get_thread_lwp (current_inferior)));
1156 current_inferior = NULL;
1158 fprintf (stderr, "Current inferior is now <NULL>\n");
1161 /* If we were waiting for this particular child to do something...
1162 well, it did something. */
1163 if (requested_child != NULL)
1164 return lwpid_of (event_child);
1166 /* Wait for a more interesting event. */
1170 if (event_child->must_set_ptrace_flags)
1172 ptrace (PTRACE_SETOPTIONS, lwpid_of (event_child),
1173 0, PTRACE_O_TRACECLONE);
1174 event_child->must_set_ptrace_flags = 0;
1177 if (WIFSTOPPED (*wstat)
1178 && WSTOPSIG (*wstat) == SIGSTOP
1179 && event_child->stop_expected)
1182 fprintf (stderr, "Expected stop.\n");
1183 event_child->stop_expected = 0;
1184 linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL);
1188 if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP
1189 && *wstat >> 16 != 0)
1191 handle_extended_wait (event_child, *wstat);
1195 /* If GDB is not interested in this signal, don't stop other
1196 threads, and don't report it to GDB. Just resume the
1197 inferior right away. We do this for threading-related
1198 signals as well as any that GDB specifically requested we
1199 ignore. But never ignore SIGSTOP if we sent it ourselves,
1200 and do not ignore signals when stepping - they may require
1201 special handling to skip the signal handler. */
1202 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
1204 if (WIFSTOPPED (*wstat)
1205 && !event_child->stepping
1207 #ifdef USE_THREAD_DB
1208 (current_process ()->private->thread_db != NULL
1209 && (WSTOPSIG (*wstat) == __SIGRTMIN
1210 || WSTOPSIG (*wstat) == __SIGRTMIN + 1))
1213 (pass_signals[target_signal_from_host (WSTOPSIG (*wstat))]
1214 && (WSTOPSIG (*wstat) != SIGSTOP || !stopping_threads))))
1216 siginfo_t info, *info_p;
1219 fprintf (stderr, "Ignored signal %d for LWP %ld.\n",
1220 WSTOPSIG (*wstat), lwpid_of (event_child));
1222 if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0)
1226 linux_resume_one_lwp (event_child,
1227 event_child->stepping,
1228 WSTOPSIG (*wstat), info_p);
1232 /* If this event was not handled above, and is not a SIGTRAP, report
1234 if (!WIFSTOPPED (*wstat) || WSTOPSIG (*wstat) != SIGTRAP)
1235 return lwpid_of (event_child);
1237 /* If this target does not support breakpoints, we simply report the
1238 SIGTRAP; it's of no concern to us. */
1239 if (the_low_target.get_pc == NULL)
1240 return lwpid_of (event_child);
1242 stop_pc = get_stop_pc ();
1244 /* bp_reinsert will only be set if we were single-stepping.
1245 Notice that we will resume the process after hitting
1246 a gdbserver breakpoint; single-stepping to/over one
1247 is not supported (yet). */
1248 if (event_child->bp_reinsert != 0)
1251 fprintf (stderr, "Reinserted breakpoint.\n");
1252 reinsert_breakpoint (event_child->bp_reinsert);
1253 event_child->bp_reinsert = 0;
1255 /* Clear the single-stepping flag and SIGTRAP as we resume. */
1256 linux_resume_one_lwp (event_child, 0, 0, NULL);
1260 bp_status = check_breakpoints (stop_pc);
1265 fprintf (stderr, "Hit a gdbserver breakpoint.\n");
1267 /* We hit one of our own breakpoints. We mark it as a pending
1268 breakpoint, so that check_removed_breakpoint () will do the PC
1269 adjustment for us at the appropriate time. */
1270 event_child->pending_is_breakpoint = 1;
1271 event_child->pending_stop_pc = stop_pc;
1273 /* We may need to put the breakpoint back. We continue in the event
1274 loop instead of simply replacing the breakpoint right away,
1275 in order to not lose signals sent to the thread that hit the
1276 breakpoint. Unfortunately this increases the window where another
1277 thread could sneak past the removed breakpoint. For the current
1278 use of server-side breakpoints (thread creation) this is
1279 acceptable; but it needs to be considered before this breakpoint
1280 mechanism can be used in more general ways. For some breakpoints
1281 it may be necessary to stop all other threads, but that should
1282 be avoided where possible.
1284 If breakpoint_reinsert_addr is NULL, that means that we can
1285 use PTRACE_SINGLESTEP on this platform. Uninsert the breakpoint,
1286 mark it for reinsertion, and single-step.
1288 Otherwise, call the target function to figure out where we need
1289 our temporary breakpoint, create it, and continue executing this
1292 /* NOTE: we're lifting breakpoints in non-stop mode. This
1293 is currently only used for thread event breakpoints, so
1294 it isn't that bad as long as we have PTRACE_EVENT_CLONE
1297 /* No need to reinsert. */
1298 linux_resume_one_lwp (event_child, 0, 0, NULL);
1299 else if (the_low_target.breakpoint_reinsert_addr == NULL)
1301 event_child->bp_reinsert = stop_pc;
1302 uninsert_breakpoint (stop_pc);
1303 linux_resume_one_lwp (event_child, 1, 0, NULL);
1307 reinsert_breakpoint_by_bp
1308 (stop_pc, (*the_low_target.breakpoint_reinsert_addr) ());
1309 linux_resume_one_lwp (event_child, 0, 0, NULL);
1316 fprintf (stderr, "Hit a non-gdbserver breakpoint.\n");
1318 /* If we were single-stepping, we definitely want to report the
1319 SIGTRAP. Although the single-step operation has completed,
1320 do not clear clear the stepping flag yet; we need to check it
1321 in wait_for_sigstop. */
1322 if (event_child->stepping)
1323 return lwpid_of (event_child);
1325 /* A SIGTRAP that we can't explain. It may have been a breakpoint.
1326 Check if it is a breakpoint, and if so mark the process information
1327 accordingly. This will handle both the necessary fiddling with the
1328 PC on decr_pc_after_break targets and suppressing extra threads
1329 hitting a breakpoint if two hit it at once and then GDB removes it
1330 after the first is reported. Arguably it would be better to report
1331 multiple threads hitting breakpoints simultaneously, but the current
1332 remote protocol does not allow this. */
1333 if ((*the_low_target.breakpoint_at) (stop_pc))
1335 event_child->pending_is_breakpoint = 1;
1336 event_child->pending_stop_pc = stop_pc;
1339 return lwpid_of (event_child);
1347 linux_wait_for_event (ptid_t ptid, int *wstat, int options)
1351 if (ptid_is_pid (ptid))
1353 /* A request to wait for a specific tgid. This is not possible
1354 with waitpid, so instead, we wait for any child, and leave
1355 children we're not interested in right now with a pending
1356 status to report later. */
1357 wait_ptid = minus_one_ptid;
1366 event_pid = linux_wait_for_event_1 (wait_ptid, wstat, options);
1369 && ptid_is_pid (ptid) && ptid_get_pid (ptid) != event_pid)
1371 struct lwp_info *event_child = find_lwp_pid (pid_to_ptid (event_pid));
1373 if (! WIFSTOPPED (*wstat))
1374 mark_lwp_dead (event_child, *wstat);
1377 event_child->status_pending_p = 1;
1378 event_child->status_pending = *wstat;
1386 /* Wait for process, returns status. */
1389 linux_wait_1 (ptid_t ptid,
1390 struct target_waitstatus *ourstatus, int target_options)
1393 struct thread_info *thread = NULL;
1394 struct lwp_info *lwp = NULL;
1398 /* Translate generic target options into linux options. */
1400 if (target_options & TARGET_WNOHANG)
1404 ourstatus->kind = TARGET_WAITKIND_IGNORE;
1406 /* If we were only supposed to resume one thread, only wait for
1407 that thread - if it's still alive. If it died, however - which
1408 can happen if we're coming from the thread death case below -
1409 then we need to make sure we restart the other threads. We could
1410 pick a thread at random or restart all; restarting all is less
1413 && !ptid_equal (cont_thread, null_ptid)
1414 && !ptid_equal (cont_thread, minus_one_ptid))
1416 thread = (struct thread_info *) find_inferior_id (&all_threads,
1419 /* No stepping, no signal - unless one is pending already, of course. */
1422 struct thread_resume resume_info;
1423 resume_info.thread = minus_one_ptid;
1424 resume_info.kind = resume_continue;
1425 resume_info.sig = 0;
1426 linux_resume (&resume_info, 1);
1432 pid = linux_wait_for_event (ptid, &w, options);
1433 if (pid == 0) /* only if TARGET_WNOHANG */
1436 lwp = get_thread_lwp (current_inferior);
1438 /* If we are waiting for a particular child, and it exited,
1439 linux_wait_for_event will return its exit status. Similarly if
1440 the last child exited. If this is not the last child, however,
1441 do not report it as exited until there is a 'thread exited' response
1442 available in the remote protocol. Instead, just wait for another event.
1443 This should be safe, because if the thread crashed we will already
1444 have reported the termination signal to GDB; that should stop any
1445 in-progress stepping operations, etc.
1447 Report the exit status of the last thread to exit. This matches
1448 LinuxThreads' behavior. */
1450 if (last_thread_of_process_p (current_inferior))
1452 if (WIFEXITED (w) || WIFSIGNALED (w))
1454 int pid = pid_of (lwp);
1455 struct process_info *process = find_process_pid (pid);
1457 #ifdef USE_THREAD_DB
1458 thread_db_free (process, 0);
1461 linux_remove_process (process);
1463 current_inferior = NULL;
1467 ourstatus->kind = TARGET_WAITKIND_EXITED;
1468 ourstatus->value.integer = WEXITSTATUS (w);
1471 fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
1475 ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
1476 ourstatus->value.sig = target_signal_from_host (WTERMSIG (w));
1479 fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
1483 return pid_to_ptid (pid);
1488 if (!WIFSTOPPED (w))
1492 /* In all-stop, stop all threads. Be careful to only do this if
1493 we're about to report an event to GDB. */
1497 ourstatus->kind = TARGET_WAITKIND_STOPPED;
1499 if (lwp->suspended && WSTOPSIG (w) == SIGSTOP)
1501 /* A thread that has been requested to stop by GDB with vCont;t,
1502 and it stopped cleanly, so report as SIG0. The use of
1503 SIGSTOP is an implementation detail. */
1504 ourstatus->value.sig = TARGET_SIGNAL_0;
1506 else if (lwp->suspended && WSTOPSIG (w) != SIGSTOP)
1508 /* A thread that has been requested to stop by GDB with vCont;t,
1509 but, it stopped for other reasons. Set stop_expected so the
1510 pending SIGSTOP is ignored and the LWP is resumed. */
1511 lwp->stop_expected = 1;
1512 ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w));
1516 ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w));
1520 fprintf (stderr, "linux_wait ret = %s, %d, %d\n",
1521 target_pid_to_str (lwp->head.id),
1523 ourstatus->value.sig);
1525 return lwp->head.id;
1528 /* Get rid of any pending event in the pipe. */
1530 async_file_flush (void)
1536 ret = read (linux_event_pipe[0], &buf, 1);
1537 while (ret >= 0 || (ret == -1 && errno == EINTR));
1540 /* Put something in the pipe, so the event loop wakes up. */
1542 async_file_mark (void)
1546 async_file_flush ();
1549 ret = write (linux_event_pipe[1], "+", 1);
1550 while (ret == 0 || (ret == -1 && errno == EINTR));
1552 /* Ignore EAGAIN. If the pipe is full, the event loop will already
1553 be awakened anyway. */
1557 linux_wait (ptid_t ptid,
1558 struct target_waitstatus *ourstatus, int target_options)
1563 fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid));
1565 /* Flush the async file first. */
1566 if (target_is_async_p ())
1567 async_file_flush ();
1569 event_ptid = linux_wait_1 (ptid, ourstatus, target_options);
1571 /* If at least one stop was reported, there may be more. A single
1572 SIGCHLD can signal more than one child stop. */
1573 if (target_is_async_p ()
1574 && (target_options & TARGET_WNOHANG) != 0
1575 && !ptid_equal (event_ptid, null_ptid))
1581 /* Send a signal to an LWP. */
1584 kill_lwp (unsigned long lwpid, int signo)
1586 /* Use tkill, if possible, in case we are using nptl threads. If tkill
1587 fails, then we are not using nptl threads and we should be using kill. */
1591 static int tkill_failed;
1598 ret = syscall (__NR_tkill, lwpid, signo);
1599 if (errno != ENOSYS)
1606 return kill (lwpid, signo);
1610 send_sigstop (struct inferior_list_entry *entry)
1612 struct lwp_info *lwp = (struct lwp_info *) entry;
1618 pid = lwpid_of (lwp);
1620 /* If we already have a pending stop signal for this process, don't
1622 if (lwp->stop_expected)
1625 fprintf (stderr, "Have pending sigstop for lwp %d\n", pid);
1627 /* We clear the stop_expected flag so that wait_for_sigstop
1628 will receive the SIGSTOP event (instead of silently resuming and
1629 waiting again). It'll be reset below. */
1630 lwp->stop_expected = 0;
1635 fprintf (stderr, "Sending sigstop to lwp %d\n", pid);
1637 kill_lwp (pid, SIGSTOP);
1641 mark_lwp_dead (struct lwp_info *lwp, int wstat)
1643 /* It's dead, really. */
1646 /* Store the exit status for later. */
1647 lwp->status_pending_p = 1;
1648 lwp->status_pending = wstat;
1650 /* So that check_removed_breakpoint doesn't try to figure out if
1651 this is stopped at a breakpoint. */
1652 lwp->pending_is_breakpoint = 0;
1654 /* Prevent trying to stop it. */
1657 /* No further stops are expected from a dead lwp. */
1658 lwp->stop_expected = 0;
1662 wait_for_sigstop (struct inferior_list_entry *entry)
1664 struct lwp_info *lwp = (struct lwp_info *) entry;
1665 struct thread_info *saved_inferior;
1673 saved_inferior = current_inferior;
1674 if (saved_inferior != NULL)
1675 saved_tid = ((struct inferior_list_entry *) saved_inferior)->id;
1677 saved_tid = null_ptid; /* avoid bogus unused warning */
1679 ptid = lwp->head.id;
1681 linux_wait_for_event (ptid, &wstat, __WALL);
1683 /* If we stopped with a non-SIGSTOP signal, save it for later
1684 and record the pending SIGSTOP. If the process exited, just
1686 if (WIFSTOPPED (wstat)
1687 && WSTOPSIG (wstat) != SIGSTOP)
1690 fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n",
1691 lwpid_of (lwp), wstat);
1693 /* Do not leave a pending single-step finish to be reported to
1694 the client. The client will give us a new action for this
1695 thread, possibly a continue request --- otherwise, the client
1696 would consider this pending SIGTRAP reported later a spurious
1698 if (WSTOPSIG (wstat) == SIGTRAP
1700 && !linux_stopped_by_watchpoint ())
1703 fprintf (stderr, " single-step SIGTRAP ignored\n");
1707 lwp->status_pending_p = 1;
1708 lwp->status_pending = wstat;
1710 lwp->stop_expected = 1;
1712 else if (!WIFSTOPPED (wstat))
1715 fprintf (stderr, "Process %ld exited while stopping LWPs\n",
1718 /* Leave this status pending for the next time we're able to
1719 report it. In the mean time, we'll report this lwp as dead
1720 to GDB, so GDB doesn't try to read registers and memory from
1722 mark_lwp_dead (lwp, wstat);
1725 if (saved_inferior == NULL || linux_thread_alive (saved_tid))
1726 current_inferior = saved_inferior;
1730 fprintf (stderr, "Previously current thread died.\n");
1734 /* We can't change the current inferior behind GDB's back,
1735 otherwise, a subsequent command may apply to the wrong
1737 current_inferior = NULL;
1741 /* Set a valid thread as current. */
1742 set_desired_inferior (0);
1748 stop_all_lwps (void)
1750 stopping_threads = 1;
1751 for_each_inferior (&all_lwps, send_sigstop);
1752 for_each_inferior (&all_lwps, wait_for_sigstop);
1753 stopping_threads = 0;
1756 /* Resume execution of the inferior process.
1757 If STEP is nonzero, single-step it.
1758 If SIGNAL is nonzero, give it that signal. */
1761 linux_resume_one_lwp (struct lwp_info *lwp,
1762 int step, int signal, siginfo_t *info)
1764 struct thread_info *saved_inferior;
1766 if (lwp->stopped == 0)
1769 /* If we have pending signals or status, and a new signal, enqueue the
1770 signal. Also enqueue the signal if we are waiting to reinsert a
1771 breakpoint; it will be picked up again below. */
1773 && (lwp->status_pending_p || lwp->pending_signals != NULL
1774 || lwp->bp_reinsert != 0))
1776 struct pending_signals *p_sig;
1777 p_sig = xmalloc (sizeof (*p_sig));
1778 p_sig->prev = lwp->pending_signals;
1779 p_sig->signal = signal;
1781 memset (&p_sig->info, 0, sizeof (siginfo_t));
1783 memcpy (&p_sig->info, info, sizeof (siginfo_t));
1784 lwp->pending_signals = p_sig;
1787 if (lwp->status_pending_p && !check_removed_breakpoint (lwp))
1790 saved_inferior = current_inferior;
1791 current_inferior = get_lwp_thread (lwp);
1794 fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n",
1795 lwpid_of (lwp), step ? "step" : "continue", signal,
1796 lwp->stop_expected ? "expected" : "not expected");
1798 /* This bit needs some thinking about. If we get a signal that
1799 we must report while a single-step reinsert is still pending,
1800 we often end up resuming the thread. It might be better to
1801 (ew) allow a stack of pending events; then we could be sure that
1802 the reinsert happened right away and not lose any signals.
1804 Making this stack would also shrink the window in which breakpoints are
1805 uninserted (see comment in linux_wait_for_lwp) but not enough for
1806 complete correctness, so it won't solve that problem. It may be
1807 worthwhile just to solve this one, however. */
1808 if (lwp->bp_reinsert != 0)
1811 fprintf (stderr, " pending reinsert at %08lx", (long)lwp->bp_reinsert);
1813 fprintf (stderr, "BAD - reinserting but not stepping.\n");
1816 /* Postpone any pending signal. It was enqueued above. */
1820 check_removed_breakpoint (lwp);
1822 if (debug_threads && the_low_target.get_pc != NULL)
1824 CORE_ADDR pc = (*the_low_target.get_pc) ();
1825 fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc);
1828 /* If we have pending signals, consume one unless we are trying to reinsert
1830 if (lwp->pending_signals != NULL && lwp->bp_reinsert == 0)
1832 struct pending_signals **p_sig;
1834 p_sig = &lwp->pending_signals;
1835 while ((*p_sig)->prev != NULL)
1836 p_sig = &(*p_sig)->prev;
1838 signal = (*p_sig)->signal;
1839 if ((*p_sig)->info.si_signo != 0)
1840 ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info);
1846 if (the_low_target.prepare_to_resume != NULL)
1847 the_low_target.prepare_to_resume (lwp);
1849 regcache_invalidate_one ((struct inferior_list_entry *)
1850 get_lwp_thread (lwp));
1853 lwp->stepping = step;
1854 ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, signal);
1856 current_inferior = saved_inferior;
1859 /* ESRCH from ptrace either means that the thread was already
1860 running (an error) or that it is gone (a race condition). If
1861 it's gone, we will get a notification the next time we wait,
1862 so we can ignore the error. We could differentiate these
1863 two, but it's tricky without waiting; the thread still exists
1864 as a zombie, so sending it signal 0 would succeed. So just
1869 perror_with_name ("ptrace");
1873 struct thread_resume_array
1875 struct thread_resume *resume;
1879 /* This function is called once per thread. We look up the thread
1880 in RESUME_PTR, and mark the thread with a pointer to the appropriate
1883 This algorithm is O(threads * resume elements), but resume elements
1884 is small (and will remain small at least until GDB supports thread
1887 linux_set_resume_request (struct inferior_list_entry *entry, void *arg)
1889 struct lwp_info *lwp;
1890 struct thread_info *thread;
1892 struct thread_resume_array *r;
1894 thread = (struct thread_info *) entry;
1895 lwp = get_thread_lwp (thread);
1898 for (ndx = 0; ndx < r->n; ndx++)
1900 ptid_t ptid = r->resume[ndx].thread;
1901 if (ptid_equal (ptid, minus_one_ptid)
1902 || ptid_equal (ptid, entry->id)
1903 || (ptid_is_pid (ptid)
1904 && (ptid_get_pid (ptid) == pid_of (lwp)))
1905 || (ptid_get_lwp (ptid) == -1
1906 && (ptid_get_pid (ptid) == pid_of (lwp))))
1908 lwp->resume = &r->resume[ndx];
1913 /* No resume action for this thread. */
1920 /* Set *FLAG_P if this lwp has an interesting status pending. */
1922 resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p)
1924 struct lwp_info *lwp = (struct lwp_info *) entry;
1926 /* LWPs which will not be resumed are not interesting, because
1927 we might not wait for them next time through linux_wait. */
1928 if (lwp->resume == NULL)
1931 /* If this thread has a removed breakpoint, we won't have any
1932 events to report later, so check now. check_removed_breakpoint
1933 may clear status_pending_p. We avoid calling check_removed_breakpoint
1934 for any thread that we are not otherwise going to resume - this
1935 lets us preserve stopped status when two threads hit a breakpoint.
1936 GDB removes the breakpoint to single-step a particular thread
1937 past it, then re-inserts it and resumes all threads. We want
1938 to report the second thread without resuming it in the interim. */
1939 if (lwp->status_pending_p)
1940 check_removed_breakpoint (lwp);
1942 if (lwp->status_pending_p)
1943 * (int *) flag_p = 1;
1948 /* This function is called once per thread. We check the thread's resume
1949 request, which will tell us whether to resume, step, or leave the thread
1950 stopped; and what signal, if any, it should be sent.
1952 For threads which we aren't explicitly told otherwise, we preserve
1953 the stepping flag; this is used for stepping over gdbserver-placed
1956 If pending_flags was set in any thread, we queue any needed
1957 signals, since we won't actually resume. We already have a pending
1958 event to report, so we don't need to preserve any step requests;
1959 they should be re-issued if necessary. */
1962 linux_resume_one_thread (struct inferior_list_entry *entry, void *arg)
1964 struct lwp_info *lwp;
1965 struct thread_info *thread;
1967 int pending_flag = * (int *) arg;
1969 thread = (struct thread_info *) entry;
1970 lwp = get_thread_lwp (thread);
1972 if (lwp->resume == NULL)
1975 if (lwp->resume->kind == resume_stop)
1978 fprintf (stderr, "suspending LWP %ld\n", lwpid_of (lwp));
1983 fprintf (stderr, "running -> suspending LWP %ld\n", lwpid_of (lwp));
1986 send_sigstop (&lwp->head);
1993 fprintf (stderr, "already stopped/suspended LWP %ld\n",
1996 fprintf (stderr, "already stopped/not suspended LWP %ld\n",
2000 /* Make sure we leave the LWP suspended, so we don't try to
2001 resume it without GDB telling us to. FIXME: The LWP may
2002 have been stopped in an internal event that was not meant
2003 to be notified back to GDB (e.g., gdbserver breakpoint),
2004 so we should be reporting a stop event in that case
2009 /* For stop requests, we're done. */
2016 /* If this thread which is about to be resumed has a pending status,
2017 then don't resume any threads - we can just report the pending
2018 status. Make sure to queue any signals that would otherwise be
2019 sent. In all-stop mode, we do this decision based on if *any*
2020 thread has a pending status. */
2022 resume_status_pending_p (&lwp->head, &pending_flag);
2027 fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp));
2029 if (ptid_equal (lwp->resume->thread, minus_one_ptid)
2031 && lwp->pending_is_breakpoint)
2034 step = (lwp->resume->kind == resume_step);
2036 linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL);
2041 fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp));
2043 /* If we have a new signal, enqueue the signal. */
2044 if (lwp->resume->sig != 0)
2046 struct pending_signals *p_sig;
2047 p_sig = xmalloc (sizeof (*p_sig));
2048 p_sig->prev = lwp->pending_signals;
2049 p_sig->signal = lwp->resume->sig;
2050 memset (&p_sig->info, 0, sizeof (siginfo_t));
2052 /* If this is the same signal we were previously stopped by,
2053 make sure to queue its siginfo. We can ignore the return
2054 value of ptrace; if it fails, we'll skip
2055 PTRACE_SETSIGINFO. */
2056 if (WIFSTOPPED (lwp->last_status)
2057 && WSTOPSIG (lwp->last_status) == lwp->resume->sig)
2058 ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info);
2060 lwp->pending_signals = p_sig;
2069 linux_resume (struct thread_resume *resume_info, size_t n)
2072 struct thread_resume_array array = { resume_info, n };
2074 find_inferior (&all_threads, linux_set_resume_request, &array);
2076 /* If there is a thread which would otherwise be resumed, which
2077 has a pending status, then don't resume any threads - we can just
2078 report the pending status. Make sure to queue any signals
2079 that would otherwise be sent. In non-stop mode, we'll apply this
2080 logic to each thread individually. */
2083 find_inferior (&all_lwps, resume_status_pending_p, &pending_flag);
2088 fprintf (stderr, "Not resuming, pending status\n");
2090 fprintf (stderr, "Resuming, no pending status\n");
2093 find_inferior (&all_threads, linux_resume_one_thread, &pending_flag);
2096 #ifdef HAVE_LINUX_USRREGS
2099 register_addr (int regnum)
2103 if (regnum < 0 || regnum >= the_low_target.num_regs)
2104 error ("Invalid register number %d.", regnum);
2106 addr = the_low_target.regmap[regnum];
2111 /* Fetch one register. */
2113 fetch_register (int regno)
2120 if (regno >= the_low_target.num_regs)
2122 if ((*the_low_target.cannot_fetch_register) (regno))
2125 regaddr = register_addr (regno);
2129 pid = lwpid_of (get_thread_lwp (current_inferior));
2130 size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1)
2131 & - sizeof (PTRACE_XFER_TYPE));
2132 buf = alloca (size);
2133 for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE))
2136 *(PTRACE_XFER_TYPE *) (buf + i) =
2137 ptrace (PTRACE_PEEKUSER, pid, (PTRACE_ARG3_TYPE) regaddr, 0);
2138 regaddr += sizeof (PTRACE_XFER_TYPE);
2141 /* Warning, not error, in case we are attached; sometimes the
2142 kernel doesn't let us at the registers. */
2143 char *err = strerror (errno);
2144 char *msg = alloca (strlen (err) + 128);
2145 sprintf (msg, "reading register %d: %s", regno, err);
2151 if (the_low_target.supply_ptrace_register)
2152 the_low_target.supply_ptrace_register (regno, buf);
2154 supply_register (regno, buf);
2159 /* Fetch all registers, or just one, from the child process. */
2161 usr_fetch_inferior_registers (int regno)
2164 for (regno = 0; regno < the_low_target.num_regs; regno++)
2165 fetch_register (regno);
2167 fetch_register (regno);
2170 /* Store our register values back into the inferior.
2171 If REGNO is -1, do this for all registers.
2172 Otherwise, REGNO specifies which register (so we can save time). */
2174 usr_store_inferior_registers (int regno)
2183 if (regno >= the_low_target.num_regs)
2186 if ((*the_low_target.cannot_store_register) (regno) == 1)
2189 regaddr = register_addr (regno);
2193 size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1)
2194 & - sizeof (PTRACE_XFER_TYPE);
2195 buf = alloca (size);
2196 memset (buf, 0, size);
2198 if (the_low_target.collect_ptrace_register)
2199 the_low_target.collect_ptrace_register (regno, buf);
2201 collect_register (regno, buf);
2203 pid = lwpid_of (get_thread_lwp (current_inferior));
2204 for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE))
2207 ptrace (PTRACE_POKEUSER, pid, (PTRACE_ARG3_TYPE) regaddr,
2208 *(PTRACE_XFER_TYPE *) (buf + i));
2211 /* At this point, ESRCH should mean the process is
2212 already gone, in which case we simply ignore attempts
2213 to change its registers. See also the related
2214 comment in linux_resume_one_lwp. */
2218 if ((*the_low_target.cannot_store_register) (regno) == 0)
2220 char *err = strerror (errno);
2221 char *msg = alloca (strlen (err) + 128);
2222 sprintf (msg, "writing register %d: %s",
2228 regaddr += sizeof (PTRACE_XFER_TYPE);
2232 for (regno = 0; regno < the_low_target.num_regs; regno++)
2233 usr_store_inferior_registers (regno);
2235 #endif /* HAVE_LINUX_USRREGS */
2239 #ifdef HAVE_LINUX_REGSETS
2242 regsets_fetch_inferior_registers ()
2244 struct regset_info *regset;
2245 int saw_general_regs = 0;
2248 regset = target_regsets;
2250 pid = lwpid_of (get_thread_lwp (current_inferior));
2251 while (regset->size >= 0)
2256 if (regset->size == 0 || disabled_regsets[regset - target_regsets])
2262 buf = xmalloc (regset->size);
2264 res = ptrace (regset->get_request, pid, 0, buf);
2266 res = ptrace (regset->get_request, pid, buf, 0);
2272 /* If we get EIO on a regset, do not try it again for
2274 disabled_regsets[regset - target_regsets] = 1;
2281 sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d",
2286 else if (regset->type == GENERAL_REGS)
2287 saw_general_regs = 1;
2288 regset->store_function (buf);
2292 if (saw_general_regs)
2299 regsets_store_inferior_registers ()
2301 struct regset_info *regset;
2302 int saw_general_regs = 0;
2305 regset = target_regsets;
2307 pid = lwpid_of (get_thread_lwp (current_inferior));
2308 while (regset->size >= 0)
2313 if (regset->size == 0 || disabled_regsets[regset - target_regsets])
2319 buf = xmalloc (regset->size);
2321 /* First fill the buffer with the current register set contents,
2322 in case there are any items in the kernel's regset that are
2323 not in gdbserver's regcache. */
2325 res = ptrace (regset->get_request, pid, 0, buf);
2327 res = ptrace (regset->get_request, pid, buf, 0);
2332 /* Then overlay our cached registers on that. */
2333 regset->fill_function (buf);
2335 /* Only now do we write the register set. */
2337 res = ptrace (regset->set_request, pid, 0, buf);
2339 res = ptrace (regset->set_request, pid, buf, 0);
2347 /* If we get EIO on a regset, do not try it again for
2349 disabled_regsets[regset - target_regsets] = 1;
2353 else if (errno == ESRCH)
2355 /* At this point, ESRCH should mean the process is
2356 already gone, in which case we simply ignore attempts
2357 to change its registers. See also the related
2358 comment in linux_resume_one_lwp. */
2364 perror ("Warning: ptrace(regsets_store_inferior_registers)");
2367 else if (regset->type == GENERAL_REGS)
2368 saw_general_regs = 1;
2372 if (saw_general_regs)
2379 #endif /* HAVE_LINUX_REGSETS */
2383 linux_fetch_registers (int regno)
2385 #ifdef HAVE_LINUX_REGSETS
2386 if (regsets_fetch_inferior_registers () == 0)
2389 #ifdef HAVE_LINUX_USRREGS
2390 usr_fetch_inferior_registers (regno);
2395 linux_store_registers (int regno)
2397 #ifdef HAVE_LINUX_REGSETS
2398 if (regsets_store_inferior_registers () == 0)
2401 #ifdef HAVE_LINUX_USRREGS
2402 usr_store_inferior_registers (regno);
2407 /* Copy LEN bytes from inferior's memory starting at MEMADDR
2408 to debugger memory starting at MYADDR. */
2411 linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
2414 /* Round starting address down to longword boundary. */
2415 register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE);
2416 /* Round ending address up; get number of longwords that makes. */
2418 = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1)
2419 / sizeof (PTRACE_XFER_TYPE);
2420 /* Allocate buffer of that many longwords. */
2421 register PTRACE_XFER_TYPE *buffer
2422 = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
2425 int pid = lwpid_of (get_thread_lwp (current_inferior));
2427 /* Try using /proc. Don't bother for one word. */
2428 if (len >= 3 * sizeof (long))
2430 /* We could keep this file open and cache it - possibly one per
2431 thread. That requires some juggling, but is even faster. */
2432 sprintf (filename, "/proc/%d/mem", pid);
2433 fd = open (filename, O_RDONLY | O_LARGEFILE);
2437 /* If pread64 is available, use it. It's faster if the kernel
2438 supports it (only one syscall), and it's 64-bit safe even on
2439 32-bit platforms (for instance, SPARC debugging a SPARC64
2442 if (pread64 (fd, myaddr, len, memaddr) != len)
2444 if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, myaddr, len) != len)
2456 /* Read all the longwords */
2457 for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
2460 buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, (PTRACE_ARG3_TYPE) addr, 0);
2465 /* Copy appropriate bytes out of the buffer. */
2467 (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)),
2473 /* Copy LEN bytes of data from debugger memory at MYADDR
2474 to inferior's memory at MEMADDR.
2475 On failure (cannot write the inferior)
2476 returns the value of errno. */
2479 linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len)
2482 /* Round starting address down to longword boundary. */
2483 register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE);
2484 /* Round ending address up; get number of longwords that makes. */
2486 = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE);
2487 /* Allocate buffer of that many longwords. */
2488 register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
2489 int pid = lwpid_of (get_thread_lwp (current_inferior));
2493 /* Dump up to four bytes. */
2494 unsigned int val = * (unsigned int *) myaddr;
2500 val = val & 0xffffff;
2501 fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4),
2502 val, (long)memaddr);
2505 /* Fill start and end extra bytes of buffer with existing memory data. */
2507 buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, (PTRACE_ARG3_TYPE) addr, 0);
2512 = ptrace (PTRACE_PEEKTEXT, pid,
2513 (PTRACE_ARG3_TYPE) (addr + (count - 1)
2514 * sizeof (PTRACE_XFER_TYPE)),
2518 /* Copy data to be written over corresponding part of buffer */
2520 memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len);
2522 /* Write the entire buffer. */
2524 for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
2527 ptrace (PTRACE_POKETEXT, pid, (PTRACE_ARG3_TYPE) addr, buffer[i]);
2535 static int linux_supports_tracefork_flag;
2537 /* Helper functions for linux_test_for_tracefork, called via clone (). */
2540 linux_tracefork_grandchild (void *arg)
2545 #define STACK_SIZE 4096
2548 linux_tracefork_child (void *arg)
2550 ptrace (PTRACE_TRACEME, 0, 0, 0);
2551 kill (getpid (), SIGSTOP);
2553 __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE,
2554 CLONE_VM | SIGCHLD, NULL);
2556 clone (linux_tracefork_grandchild, arg + STACK_SIZE,
2557 CLONE_VM | SIGCHLD, NULL);
2562 /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make
2563 sure that we can enable the option, and that it had the desired
2567 linux_test_for_tracefork (void)
2569 int child_pid, ret, status;
2571 char *stack = xmalloc (STACK_SIZE * 4);
2573 linux_supports_tracefork_flag = 0;
2575 /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */
2577 child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE,
2578 CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2);
2580 child_pid = clone (linux_tracefork_child, stack + STACK_SIZE,
2581 CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2);
2583 if (child_pid == -1)
2584 perror_with_name ("clone");
2586 ret = my_waitpid (child_pid, &status, 0);
2588 perror_with_name ("waitpid");
2589 else if (ret != child_pid)
2590 error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret);
2591 if (! WIFSTOPPED (status))
2592 error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status);
2594 ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK);
2597 ret = ptrace (PTRACE_KILL, child_pid, 0, 0);
2600 warning ("linux_test_for_tracefork: failed to kill child");
2604 ret = my_waitpid (child_pid, &status, 0);
2605 if (ret != child_pid)
2606 warning ("linux_test_for_tracefork: failed to wait for killed child");
2607 else if (!WIFSIGNALED (status))
2608 warning ("linux_test_for_tracefork: unexpected wait status 0x%x from "
2609 "killed child", status);
2614 ret = ptrace (PTRACE_CONT, child_pid, 0, 0);
2616 warning ("linux_test_for_tracefork: failed to resume child");
2618 ret = my_waitpid (child_pid, &status, 0);
2620 if (ret == child_pid && WIFSTOPPED (status)
2621 && status >> 16 == PTRACE_EVENT_FORK)
2624 ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid);
2625 if (ret == 0 && second_pid != 0)
2629 linux_supports_tracefork_flag = 1;
2630 my_waitpid (second_pid, &second_status, 0);
2631 ret = ptrace (PTRACE_KILL, second_pid, 0, 0);
2633 warning ("linux_test_for_tracefork: failed to kill second child");
2634 my_waitpid (second_pid, &status, 0);
2638 warning ("linux_test_for_tracefork: unexpected result from waitpid "
2639 "(%d, status 0x%x)", ret, status);
2643 ret = ptrace (PTRACE_KILL, child_pid, 0, 0);
2645 warning ("linux_test_for_tracefork: failed to kill child");
2646 my_waitpid (child_pid, &status, 0);
2648 while (WIFSTOPPED (status));
2655 linux_look_up_symbols (void)
2657 #ifdef USE_THREAD_DB
2658 struct process_info *proc = current_process ();
2660 if (proc->private->thread_db != NULL)
2663 thread_db_init (!linux_supports_tracefork_flag);
2668 linux_request_interrupt (void)
2670 extern unsigned long signal_pid;
2672 if (!ptid_equal (cont_thread, null_ptid)
2673 && !ptid_equal (cont_thread, minus_one_ptid))
2675 struct lwp_info *lwp;
2678 lwp = get_thread_lwp (current_inferior);
2679 lwpid = lwpid_of (lwp);
2680 kill_lwp (lwpid, SIGINT);
2683 kill_lwp (signal_pid, SIGINT);
2686 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
2687 to debugger memory starting at MYADDR. */
2690 linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len)
2692 char filename[PATH_MAX];
2694 int pid = lwpid_of (get_thread_lwp (current_inferior));
2696 snprintf (filename, sizeof filename, "/proc/%d/auxv", pid);
2698 fd = open (filename, O_RDONLY);
2702 if (offset != (CORE_ADDR) 0
2703 && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset)
2706 n = read (fd, myaddr, len);
2713 /* These breakpoint and watchpoint related wrapper functions simply
2714 pass on the function call if the target has registered a
2715 corresponding function. */
2718 linux_insert_point (char type, CORE_ADDR addr, int len)
2720 if (the_low_target.insert_point != NULL)
2721 return the_low_target.insert_point (type, addr, len);
2723 /* Unsupported (see target.h). */
2728 linux_remove_point (char type, CORE_ADDR addr, int len)
2730 if (the_low_target.remove_point != NULL)
2731 return the_low_target.remove_point (type, addr, len);
2733 /* Unsupported (see target.h). */
2738 linux_stopped_by_watchpoint (void)
2740 if (the_low_target.stopped_by_watchpoint != NULL)
2741 return the_low_target.stopped_by_watchpoint ();
2747 linux_stopped_data_address (void)
2749 if (the_low_target.stopped_data_address != NULL)
2750 return the_low_target.stopped_data_address ();
2755 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
2756 #if defined(__mcoldfire__)
2757 /* These should really be defined in the kernel's ptrace.h header. */
2758 #define PT_TEXT_ADDR 49*4
2759 #define PT_DATA_ADDR 50*4
2760 #define PT_TEXT_END_ADDR 51*4
2763 /* Under uClinux, programs are loaded at non-zero offsets, which we need
2764 to tell gdb about. */
2767 linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p)
2769 #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR)
2770 unsigned long text, text_end, data;
2771 int pid = lwpid_of (get_thread_lwp (current_inferior));
2775 text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0);
2776 text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0);
2777 data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0);
2781 /* Both text and data offsets produced at compile-time (and so
2782 used by gdb) are relative to the beginning of the program,
2783 with the data segment immediately following the text segment.
2784 However, the actual runtime layout in memory may put the data
2785 somewhere else, so when we send gdb a data base-address, we
2786 use the real data base address and subtract the compile-time
2787 data base-address from it (which is just the length of the
2788 text segment). BSS immediately follows data in both
2791 *data_p = data - (text_end - text);
2801 linux_qxfer_osdata (const char *annex,
2802 unsigned char *readbuf, unsigned const char *writebuf,
2803 CORE_ADDR offset, int len)
2805 /* We make the process list snapshot when the object starts to be
2807 static const char *buf;
2808 static long len_avail = -1;
2809 static struct buffer buffer;
2813 if (strcmp (annex, "processes") != 0)
2816 if (!readbuf || writebuf)
2821 if (len_avail != -1 && len_avail != 0)
2822 buffer_free (&buffer);
2825 buffer_init (&buffer);
2826 buffer_grow_str (&buffer, "<osdata type=\"processes\">");
2828 dirp = opendir ("/proc");
2832 while ((dp = readdir (dirp)) != NULL)
2834 struct stat statbuf;
2835 char procentry[sizeof ("/proc/4294967295")];
2837 if (!isdigit (dp->d_name[0])
2838 || strlen (dp->d_name) > sizeof ("4294967295") - 1)
2841 sprintf (procentry, "/proc/%s", dp->d_name);
2842 if (stat (procentry, &statbuf) == 0
2843 && S_ISDIR (statbuf.st_mode))
2847 char cmd[MAXPATHLEN + 1];
2848 struct passwd *entry;
2850 sprintf (pathname, "/proc/%s/cmdline", dp->d_name);
2851 entry = getpwuid (statbuf.st_uid);
2853 if ((f = fopen (pathname, "r")) != NULL)
2855 size_t len = fread (cmd, 1, sizeof (cmd) - 1, f);
2859 for (i = 0; i < len; i++)
2867 "<column name=\"pid\">%s</column>"
2868 "<column name=\"user\">%s</column>"
2869 "<column name=\"command\">%s</column>"
2872 entry ? entry->pw_name : "?",
2882 buffer_grow_str0 (&buffer, "</osdata>\n");
2883 buf = buffer_finish (&buffer);
2884 len_avail = strlen (buf);
2887 if (offset >= len_avail)
2889 /* Done. Get rid of the data. */
2890 buffer_free (&buffer);
2896 if (len > len_avail - offset)
2897 len = len_avail - offset;
2898 memcpy (readbuf, buf + offset, len);
2903 /* Convert a native/host siginfo object, into/from the siginfo in the
2904 layout of the inferiors' architecture. */
2907 siginfo_fixup (struct siginfo *siginfo, void *inf_siginfo, int direction)
2911 if (the_low_target.siginfo_fixup != NULL)
2912 done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction);
2914 /* If there was no callback, or the callback didn't do anything,
2915 then just do a straight memcpy. */
2919 memcpy (siginfo, inf_siginfo, sizeof (struct siginfo));
2921 memcpy (inf_siginfo, siginfo, sizeof (struct siginfo));
2926 linux_xfer_siginfo (const char *annex, unsigned char *readbuf,
2927 unsigned const char *writebuf, CORE_ADDR offset, int len)
2930 struct siginfo siginfo;
2931 char inf_siginfo[sizeof (struct siginfo)];
2933 if (current_inferior == NULL)
2936 pid = lwpid_of (get_thread_lwp (current_inferior));
2939 fprintf (stderr, "%s siginfo for lwp %d.\n",
2940 readbuf != NULL ? "Reading" : "Writing",
2943 if (offset > sizeof (siginfo))
2946 if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0)
2949 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
2950 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
2951 inferior with a 64-bit GDBSERVER should look the same as debugging it
2952 with a 32-bit GDBSERVER, we need to convert it. */
2953 siginfo_fixup (&siginfo, inf_siginfo, 0);
2955 if (offset + len > sizeof (siginfo))
2956 len = sizeof (siginfo) - offset;
2958 if (readbuf != NULL)
2959 memcpy (readbuf, inf_siginfo + offset, len);
2962 memcpy (inf_siginfo + offset, writebuf, len);
2964 /* Convert back to ptrace layout before flushing it out. */
2965 siginfo_fixup (&siginfo, inf_siginfo, 1);
2967 if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0)
2974 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
2975 so we notice when children change state; as the handler for the
2976 sigsuspend in my_waitpid. */
2979 sigchld_handler (int signo)
2981 int old_errno = errno;
2984 /* fprintf is not async-signal-safe, so call write directly. */
2985 write (2, "sigchld_handler\n", sizeof ("sigchld_handler\n") - 1);
2987 if (target_is_async_p ())
2988 async_file_mark (); /* trigger a linux_wait */
2994 linux_supports_non_stop (void)
3000 linux_async (int enable)
3002 int previous = (linux_event_pipe[0] != -1);
3004 if (previous != enable)
3007 sigemptyset (&mask);
3008 sigaddset (&mask, SIGCHLD);
3010 sigprocmask (SIG_BLOCK, &mask, NULL);
3014 if (pipe (linux_event_pipe) == -1)
3015 fatal ("creating event pipe failed.");
3017 fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK);
3018 fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK);
3020 /* Register the event loop handler. */
3021 add_file_handler (linux_event_pipe[0],
3022 handle_target_event, NULL);
3024 /* Always trigger a linux_wait. */
3029 delete_file_handler (linux_event_pipe[0]);
3031 close (linux_event_pipe[0]);
3032 close (linux_event_pipe[1]);
3033 linux_event_pipe[0] = -1;
3034 linux_event_pipe[1] = -1;
3037 sigprocmask (SIG_UNBLOCK, &mask, NULL);
3044 linux_start_non_stop (int nonstop)
3046 /* Register or unregister from event-loop accordingly. */
3047 linux_async (nonstop);
3052 linux_supports_multi_process (void)
3058 /* Enumerate spufs IDs for process PID. */
3060 spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len)
3066 struct dirent *entry;
3068 sprintf (path, "/proc/%ld/fd", pid);
3069 dir = opendir (path);
3074 while ((entry = readdir (dir)) != NULL)
3080 fd = atoi (entry->d_name);
3084 sprintf (path, "/proc/%ld/fd/%d", pid, fd);
3085 if (stat (path, &st) != 0)
3087 if (!S_ISDIR (st.st_mode))
3090 if (statfs (path, &stfs) != 0)
3092 if (stfs.f_type != SPUFS_MAGIC)
3095 if (pos >= offset && pos + 4 <= offset + len)
3097 *(unsigned int *)(buf + pos - offset) = fd;
3107 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
3108 object type, using the /proc file system. */
3110 linux_qxfer_spu (const char *annex, unsigned char *readbuf,
3111 unsigned const char *writebuf,
3112 CORE_ADDR offset, int len)
3114 long pid = lwpid_of (get_thread_lwp (current_inferior));
3119 if (!writebuf && !readbuf)
3127 return spu_enumerate_spu_ids (pid, readbuf, offset, len);
3130 sprintf (buf, "/proc/%ld/fd/%s", pid, annex);
3131 fd = open (buf, writebuf? O_WRONLY : O_RDONLY);
3136 && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset)
3143 ret = write (fd, writebuf, (size_t) len);
3145 ret = read (fd, readbuf, (size_t) len);
3151 static struct target_ops linux_target_ops = {
3152 linux_create_inferior,
3160 linux_fetch_registers,
3161 linux_store_registers,
3164 linux_look_up_symbols,
3165 linux_request_interrupt,
3169 linux_stopped_by_watchpoint,
3170 linux_stopped_data_address,
3171 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
3176 #ifdef USE_THREAD_DB
3177 thread_db_get_tls_address,
3182 hostio_last_error_from_errno,
3185 linux_supports_non_stop,
3187 linux_start_non_stop,
3188 linux_supports_multi_process,
3189 #ifdef USE_THREAD_DB
3190 thread_db_handle_monitor_command
3197 linux_init_signals ()
3199 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
3200 to find what the cancel signal actually is. */
3201 signal (__SIGRTMIN+1, SIG_IGN);
3205 initialize_low (void)
3207 struct sigaction sigchld_action;
3208 memset (&sigchld_action, 0, sizeof (sigchld_action));
3209 set_target_ops (&linux_target_ops);
3210 set_breakpoint_data (the_low_target.breakpoint,
3211 the_low_target.breakpoint_len);
3212 linux_init_signals ();
3213 linux_test_for_tracefork ();
3214 #ifdef HAVE_LINUX_REGSETS
3215 for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++)
3217 disabled_regsets = xmalloc (num_regsets);
3220 sigchld_action.sa_handler = sigchld_handler;
3221 sigemptyset (&sigchld_action.sa_mask);
3222 sigchld_action.sa_flags = SA_RESTART;
3223 sigaction (SIGCHLD, &sigchld_action, NULL);