1 /* Native-dependent code for FreeBSD.
3 Copyright (C) 2002-2018 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 "byte-vector.h"
27 #include "gdbthread.h"
29 #include "inf-ptrace.h"
30 #include <sys/types.h>
31 #include <sys/procfs.h>
32 #include <sys/ptrace.h>
33 #include <sys/signal.h>
34 #include <sys/sysctl.h>
36 #if defined(HAVE_KINFO_GETFILE) || defined(HAVE_KINFO_GETVMMAP)
39 #if !defined(HAVE_KINFO_GETVMMAP)
40 #include "filestuff.h"
45 #include "fbsd-tdep.h"
49 /* Return the name of a file that can be opened to get the symbols for
50 the child process identified by PID. */
53 fbsd_nat_target::pid_to_exec_file (int pid)
56 static char buf[PATH_MAX];
59 #ifdef KERN_PROC_PATHNAME
65 mib[2] = KERN_PROC_PATHNAME;
68 if (sysctl (mib, 4, buf, &buflen, NULL, 0) == 0)
69 /* The kern.proc.pathname.<pid> sysctl returns a length of zero
70 for processes without an associated executable such as kernel
72 return buflen == 0 ? NULL : buf;
75 xsnprintf (name, PATH_MAX, "/proc/%d/exe", pid);
76 len = readlink (name, buf, PATH_MAX - 1);
86 #ifdef HAVE_KINFO_GETVMMAP
87 /* Iterate over all the memory regions in the current inferior,
88 calling FUNC for each memory region. OBFD is passed as the last
92 fbsd_nat_target::find_memory_regions (find_memory_region_ftype func,
95 pid_t pid = ptid_get_pid (inferior_ptid);
96 struct kinfo_vmentry *kve;
100 gdb::unique_xmalloc_ptr<struct kinfo_vmentry>
101 vmentl (kinfo_getvmmap (pid, &nitems));
103 perror_with_name (_("Couldn't fetch VM map entries."));
105 for (i = 0, kve = vmentl.get (); i < nitems; i++, kve++)
107 /* Skip unreadable segments and those where MAP_NOCORE has been set. */
108 if (!(kve->kve_protection & KVME_PROT_READ)
109 || kve->kve_flags & KVME_FLAG_NOCOREDUMP)
112 /* Skip segments with an invalid type. */
113 if (kve->kve_type != KVME_TYPE_DEFAULT
114 && kve->kve_type != KVME_TYPE_VNODE
115 && kve->kve_type != KVME_TYPE_SWAP
116 && kve->kve_type != KVME_TYPE_PHYS)
119 size = kve->kve_end - kve->kve_start;
122 fprintf_filtered (gdb_stdout,
123 "Save segment, %ld bytes at %s (%c%c%c)\n",
125 paddress (target_gdbarch (), kve->kve_start),
126 kve->kve_protection & KVME_PROT_READ ? 'r' : '-',
127 kve->kve_protection & KVME_PROT_WRITE ? 'w' : '-',
128 kve->kve_protection & KVME_PROT_EXEC ? 'x' : '-');
131 /* Invoke the callback function to create the corefile segment.
132 Pass MODIFIED as true, we do not know the real modification state. */
133 func (kve->kve_start, size, kve->kve_protection & KVME_PROT_READ,
134 kve->kve_protection & KVME_PROT_WRITE,
135 kve->kve_protection & KVME_PROT_EXEC, 1, obfd);
141 fbsd_read_mapping (FILE *mapfile, unsigned long *start, unsigned long *end,
144 /* FreeBSD 5.1-RELEASE uses a 256-byte buffer. */
146 int resident, privateresident;
150 /* As of FreeBSD 5.0-RELEASE, the layout is described in
151 /usr/src/sys/fs/procfs/procfs_map.c. Somewhere in 5.1-CURRENT a
152 new column was added to the procfs map. Therefore we can't use
153 fscanf since we need to support older releases too. */
154 if (fgets (buf, sizeof buf, mapfile) != NULL)
155 ret = sscanf (buf, "%lx %lx %d %d %lx %s", start, end,
156 &resident, &privateresident, &obj, protection);
158 return (ret != 0 && ret != EOF);
161 /* Iterate over all the memory regions in the current inferior,
162 calling FUNC for each memory region. OBFD is passed as the last
166 fbsd_nat_target::find_memory_regions (find_memory_region_ftype func,
169 pid_t pid = ptid_get_pid (inferior_ptid);
170 unsigned long start, end, size;
172 int read, write, exec;
174 std::string mapfilename = string_printf ("/proc/%ld/map", (long) pid);
175 gdb_file_up mapfile (fopen (mapfilename.c_str (), "r"));
177 error (_("Couldn't open %s."), mapfilename.c_str ());
180 fprintf_filtered (gdb_stdout,
181 "Reading memory regions from %s\n", mapfilename.c_str ());
183 /* Now iterate until end-of-file. */
184 while (fbsd_read_mapping (mapfile.get (), &start, &end, &protection[0]))
188 read = (strchr (protection, 'r') != 0);
189 write = (strchr (protection, 'w') != 0);
190 exec = (strchr (protection, 'x') != 0);
194 fprintf_filtered (gdb_stdout,
195 "Save segment, %ld bytes at %s (%c%c%c)\n",
196 size, paddress (target_gdbarch (), start),
202 /* Invoke the callback function to create the corefile segment.
203 Pass MODIFIED as true, we do not know the real modification state. */
204 func (start, size, read, write, exec, 1, obfd);
211 /* Fetch the command line for a running process. */
213 static gdb::unique_xmalloc_ptr<char>
214 fbsd_fetch_cmdline (pid_t pid)
222 mib[2] = KERN_PROC_ARGS;
224 if (sysctl (mib, 4, NULL, &len, NULL, 0) == -1)
230 gdb::unique_xmalloc_ptr<char> cmdline ((char *) xmalloc (len));
231 if (sysctl (mib, 4, cmdline.get (), &len, NULL, 0) == -1)
237 /* Fetch the external variant of the kernel's internal process
238 structure for the process PID into KP. */
241 fbsd_fetch_kinfo_proc (pid_t pid, struct kinfo_proc *kp)
249 mib[2] = KERN_PROC_PID;
251 return (sysctl (mib, 4, kp, &len, NULL, 0) == 0);
254 /* Implement the "info_proc" target_ops method. */
257 fbsd_nat_target::info_proc (const char *args, enum info_proc_what what)
259 #ifdef HAVE_KINFO_GETFILE
260 gdb::unique_xmalloc_ptr<struct kinfo_file> fdtbl;
263 struct kinfo_proc kp;
266 bool do_cmdline = false;
269 #ifdef HAVE_KINFO_GETVMMAP
270 bool do_mappings = false;
272 bool do_status = false;
281 #ifdef HAVE_KINFO_GETVMMAP
303 #ifdef HAVE_KINFO_GETVMMAP
309 error (_("Not supported on this target."));
312 gdb_argv built_argv (args);
313 if (built_argv.count () == 0)
315 pid = ptid_get_pid (inferior_ptid);
317 error (_("No current process: you must name one."));
319 else if (built_argv.count () == 1 && isdigit (built_argv[0][0]))
320 pid = strtol (built_argv[0], NULL, 10);
322 error (_("Invalid arguments."));
324 printf_filtered (_("process %d\n"), pid);
325 #ifdef HAVE_KINFO_GETFILE
326 if (do_cwd || do_exe)
327 fdtbl.reset (kinfo_getfile (pid, &nfd));
332 gdb::unique_xmalloc_ptr<char> cmdline = fbsd_fetch_cmdline (pid);
333 if (cmdline != nullptr)
334 printf_filtered ("cmdline = '%s'\n", cmdline.get ());
336 warning (_("unable to fetch command line"));
340 const char *cwd = NULL;
341 #ifdef HAVE_KINFO_GETFILE
342 struct kinfo_file *kf = fdtbl.get ();
343 for (int i = 0; i < nfd; i++, kf++)
345 if (kf->kf_type == KF_TYPE_VNODE && kf->kf_fd == KF_FD_TYPE_CWD)
353 printf_filtered ("cwd = '%s'\n", cwd);
355 warning (_("unable to fetch current working directory"));
359 const char *exe = NULL;
360 #ifdef HAVE_KINFO_GETFILE
361 struct kinfo_file *kf = fdtbl.get ();
362 for (int i = 0; i < nfd; i++, kf++)
364 if (kf->kf_type == KF_TYPE_VNODE && kf->kf_fd == KF_FD_TYPE_TEXT)
372 exe = pid_to_exec_file (pid);
374 printf_filtered ("exe = '%s'\n", exe);
376 warning (_("unable to fetch executable path name"));
378 #ifdef HAVE_KINFO_GETVMMAP
382 gdb::unique_xmalloc_ptr<struct kinfo_vmentry>
383 vmentl (kinfo_getvmmap (pid, &nvment));
385 if (vmentl != nullptr)
387 printf_filtered (_("Mapped address spaces:\n\n"));
389 printf_filtered (" %18s %18s %10s %10s %9s %s\n",
392 " Size", " Offset", "Flags ", "File");
394 printf_filtered ("\t%10s %10s %10s %10s %9s %s\n",
397 " Size", " Offset", "Flags ", "File");
400 struct kinfo_vmentry *kve = vmentl.get ();
401 for (int i = 0; i < nvment; i++, kve++)
405 start = kve->kve_start;
408 printf_filtered (" %18s %18s %10s %10s %9s %s\n",
411 hex_string (end - start),
412 hex_string (kve->kve_offset),
413 fbsd_vm_map_entry_flags (kve->kve_flags,
414 kve->kve_protection),
417 printf_filtered ("\t%10s %10s %10s %10s %9s %s\n",
420 hex_string (end - start),
421 hex_string (kve->kve_offset),
422 fbsd_vm_map_entry_flags (kve->kve_flags,
423 kve->kve_protection),
429 warning (_("unable to fetch virtual memory map"));
434 if (!fbsd_fetch_kinfo_proc (pid, &kp))
435 warning (_("Failed to fetch process information"));
441 printf_filtered ("Name: %s\n", kp.ki_comm);
448 state = "R (running)";
451 state = "T (stopped)";
454 state = "Z (zombie)";
457 state = "S (sleeping)";
460 state = "W (interrupt wait)";
463 state = "L (blocked on lock)";
466 state = "? (unknown)";
469 printf_filtered ("State: %s\n", state);
470 printf_filtered ("Parent process: %d\n", kp.ki_ppid);
471 printf_filtered ("Process group: %d\n", kp.ki_pgid);
472 printf_filtered ("Session id: %d\n", kp.ki_sid);
473 printf_filtered ("TTY: %ju\n", (uintmax_t) kp.ki_tdev);
474 printf_filtered ("TTY owner process group: %d\n", kp.ki_tpgid);
475 printf_filtered ("User IDs (real, effective, saved): %d %d %d\n",
476 kp.ki_ruid, kp.ki_uid, kp.ki_svuid);
477 printf_filtered ("Group IDs (real, effective, saved): %d %d %d\n",
478 kp.ki_rgid, kp.ki_groups[0], kp.ki_svgid);
479 printf_filtered ("Groups: ");
480 for (int i = 0; i < kp.ki_ngroups; i++)
481 printf_filtered ("%d ", kp.ki_groups[i]);
482 printf_filtered ("\n");
483 printf_filtered ("Minor faults (no memory page): %ld\n",
484 kp.ki_rusage.ru_minflt);
485 printf_filtered ("Minor faults, children: %ld\n",
486 kp.ki_rusage_ch.ru_minflt);
487 printf_filtered ("Major faults (memory page faults): %ld\n",
488 kp.ki_rusage.ru_majflt);
489 printf_filtered ("Major faults, children: %ld\n",
490 kp.ki_rusage_ch.ru_majflt);
491 printf_filtered ("utime: %jd.%06ld\n",
492 (intmax_t) kp.ki_rusage.ru_utime.tv_sec,
493 kp.ki_rusage.ru_utime.tv_usec);
494 printf_filtered ("stime: %jd.%06ld\n",
495 (intmax_t) kp.ki_rusage.ru_stime.tv_sec,
496 kp.ki_rusage.ru_stime.tv_usec);
497 printf_filtered ("utime, children: %jd.%06ld\n",
498 (intmax_t) kp.ki_rusage_ch.ru_utime.tv_sec,
499 kp.ki_rusage_ch.ru_utime.tv_usec);
500 printf_filtered ("stime, children: %jd.%06ld\n",
501 (intmax_t) kp.ki_rusage_ch.ru_stime.tv_sec,
502 kp.ki_rusage_ch.ru_stime.tv_usec);
503 printf_filtered ("'nice' value: %d\n", kp.ki_nice);
504 printf_filtered ("Start time: %jd.%06ld\n", kp.ki_start.tv_sec,
505 kp.ki_start.tv_usec);
506 pgtok = getpagesize () / 1024;
507 printf_filtered ("Virtual memory size: %ju kB\n",
508 (uintmax_t) kp.ki_size / 1024);
509 printf_filtered ("Data size: %ju kB\n",
510 (uintmax_t) kp.ki_dsize * pgtok);
511 printf_filtered ("Stack size: %ju kB\n",
512 (uintmax_t) kp.ki_ssize * pgtok);
513 printf_filtered ("Text size: %ju kB\n",
514 (uintmax_t) kp.ki_tsize * pgtok);
515 printf_filtered ("Resident set size: %ju kB\n",
516 (uintmax_t) kp.ki_rssize * pgtok);
517 printf_filtered ("Maximum RSS: %ju kB\n",
518 (uintmax_t) kp.ki_rusage.ru_maxrss);
519 printf_filtered ("Pending Signals: ");
520 for (int i = 0; i < _SIG_WORDS; i++)
521 printf_filtered ("%08x ", kp.ki_siglist.__bits[i]);
522 printf_filtered ("\n");
523 printf_filtered ("Ignored Signals: ");
524 for (int i = 0; i < _SIG_WORDS; i++)
525 printf_filtered ("%08x ", kp.ki_sigignore.__bits[i]);
526 printf_filtered ("\n");
527 printf_filtered ("Caught Signals: ");
528 for (int i = 0; i < _SIG_WORDS; i++)
529 printf_filtered ("%08x ", kp.ki_sigcatch.__bits[i]);
530 printf_filtered ("\n");
537 #ifdef KERN_PROC_AUXV
540 /* Return the size of siginfo for the current inferior. */
548 /* This structure matches the naming and layout of `siginfo_t' in
549 <sys/signal.h>. In particular, the `si_foo' macros defined in that
550 header can be used with both types to copy fields in the `_reason'
562 union sigval32 si_value;
595 struct gdbarch *gdbarch = get_frame_arch (get_current_frame ());
597 /* Is the inferior 32-bit? If so, use the 32-bit siginfo size. */
598 if (gdbarch_long_bit (gdbarch) == 32)
599 return sizeof (struct siginfo32);
601 return sizeof (siginfo_t);
604 /* Convert a native 64-bit siginfo object to a 32-bit object. Note
605 that FreeBSD doesn't support writing to $_siginfo, so this only
606 needs to convert one way. */
609 fbsd_convert_siginfo (siginfo_t *si)
612 struct gdbarch *gdbarch = get_frame_arch (get_current_frame ());
614 /* Is the inferior 32-bit? If not, nothing to do. */
615 if (gdbarch_long_bit (gdbarch) != 32)
618 struct siginfo32 si32;
620 si32.si_signo = si->si_signo;
621 si32.si_errno = si->si_errno;
622 si32.si_code = si->si_code;
623 si32.si_pid = si->si_pid;
624 si32.si_uid = si->si_uid;
625 si32.si_status = si->si_status;
626 si32.si_addr = (uintptr_t) si->si_addr;
628 /* If sival_ptr is being used instead of sival_int on a big-endian
629 platform, then sival_int will be zero since it holds the upper
630 32-bits of the pointer value. */
631 #if _BYTE_ORDER == _BIG_ENDIAN
632 if (si->si_value.sival_int == 0)
633 si32.si_value.sival_ptr = (uintptr_t) si->si_value.sival_ptr;
635 si32.si_value.sival_int = si->si_value.sival_int;
637 si32.si_value.sival_int = si->si_value.sival_int;
640 /* Always copy the spare fields and then possibly overwrite them for
641 signal-specific or code-specific fields. */
642 si32._reason.__spare__.__spare1__ = si->_reason.__spare__.__spare1__;
643 for (int i = 0; i < 7; i++)
644 si32._reason.__spare__.__spare2__[i] = si->_reason.__spare__.__spare2__[i];
645 switch (si->si_signo) {
650 si32.si_trapno = si->si_trapno;
653 switch (si->si_code) {
655 si32.si_timerid = si->si_timerid;
656 si32.si_overrun = si->si_overrun;
659 si32.si_mqd = si->si_mqd;
663 memcpy(si, &si32, sizeof (si32));
668 /* Implement the "xfer_partial" target_ops method. */
670 enum target_xfer_status
671 fbsd_nat_target::xfer_partial (enum target_object object,
672 const char *annex, gdb_byte *readbuf,
673 const gdb_byte *writebuf,
674 ULONGEST offset, ULONGEST len,
675 ULONGEST *xfered_len)
677 pid_t pid = ptid_get_pid (inferior_ptid);
682 case TARGET_OBJECT_SIGNAL_INFO:
684 struct ptrace_lwpinfo pl;
687 /* FreeBSD doesn't support writing to $_siginfo. */
688 if (writebuf != NULL)
689 return TARGET_XFER_E_IO;
691 if (inferior_ptid.lwp_p ())
692 pid = inferior_ptid.lwp ();
694 siginfo_size = fbsd_siginfo_size ();
695 if (offset > siginfo_size)
696 return TARGET_XFER_E_IO;
698 if (ptrace (PT_LWPINFO, pid, (PTRACE_TYPE_ARG3) &pl, sizeof (pl)) == -1)
699 return TARGET_XFER_E_IO;
701 if (!(pl.pl_flags & PL_FLAG_SI))
702 return TARGET_XFER_E_IO;
704 fbsd_convert_siginfo (&pl.pl_siginfo);
705 if (offset + len > siginfo_size)
706 len = siginfo_size - offset;
708 memcpy (readbuf, ((gdb_byte *) &pl.pl_siginfo) + offset, len);
710 return TARGET_XFER_OK;
713 case TARGET_OBJECT_AUXV:
715 gdb::byte_vector buf_storage;
720 if (writebuf != NULL)
721 return TARGET_XFER_E_IO;
724 mib[2] = KERN_PROC_AUXV;
733 buflen = offset + len;
734 buf_storage.resize (buflen);
735 buf = buf_storage.data ();
737 if (sysctl (mib, 4, buf, &buflen, NULL, 0) == 0)
744 memcpy (readbuf, buf + offset, buflen);
749 *xfered_len = buflen;
750 return (buflen == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK;
752 return TARGET_XFER_E_IO;
755 return inf_ptrace_target::xfer_partial (object, annex,
756 readbuf, writebuf, offset,
763 static int debug_fbsd_lwp;
764 static int debug_fbsd_nat;
767 show_fbsd_lwp_debug (struct ui_file *file, int from_tty,
768 struct cmd_list_element *c, const char *value)
770 fprintf_filtered (file, _("Debugging of FreeBSD lwp module is %s.\n"), value);
774 show_fbsd_nat_debug (struct ui_file *file, int from_tty,
775 struct cmd_list_element *c, const char *value)
777 fprintf_filtered (file, _("Debugging of FreeBSD native target is %s.\n"),
782 FreeBSD's first thread support was via a "reentrant" version of libc
783 (libc_r) that first shipped in 2.2.7. This library multiplexed all
784 of the threads in a process onto a single kernel thread. This
785 library was supported via the bsd-uthread target.
787 FreeBSD 5.1 introduced two new threading libraries that made use of
788 multiple kernel threads. The first (libkse) scheduled M user
789 threads onto N (<= M) kernel threads (LWPs). The second (libthr)
790 bound each user thread to a dedicated kernel thread. libkse shipped
791 as the default threading library (libpthread).
793 FreeBSD 5.3 added a libthread_db to abstract the interface across
794 the various thread libraries (libc_r, libkse, and libthr).
796 FreeBSD 7.0 switched the default threading library from from libkse
797 to libpthread and removed libc_r.
799 FreeBSD 8.0 removed libkse and the in-kernel support for it. The
800 only threading library supported by 8.0 and later is libthr which
801 ties each user thread directly to an LWP. To simplify the
802 implementation, this target only supports LWP-backed threads using
803 ptrace directly rather than libthread_db.
805 FreeBSD 11.0 introduced LWP event reporting via PT_LWP_EVENTS.
808 /* Return true if PTID is still active in the inferior. */
811 fbsd_nat_target::thread_alive (ptid_t ptid)
813 if (ptid_lwp_p (ptid))
815 struct ptrace_lwpinfo pl;
817 if (ptrace (PT_LWPINFO, ptid_get_lwp (ptid), (caddr_t) &pl, sizeof pl)
820 #ifdef PL_FLAG_EXITED
821 if (pl.pl_flags & PL_FLAG_EXITED)
829 /* Convert PTID to a string. Returns the string in a static
833 fbsd_nat_target::pid_to_str (ptid_t ptid)
837 lwp = ptid_get_lwp (ptid);
841 int pid = ptid_get_pid (ptid);
843 xsnprintf (buf, sizeof buf, "LWP %d of process %d", lwp, pid);
847 return normal_pid_to_str (ptid);
850 #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME
851 /* Return the name assigned to a thread by an application. Returns
852 the string in a static buffer. */
855 fbsd_nat_target::thread_name (struct thread_info *thr)
857 struct ptrace_lwpinfo pl;
858 struct kinfo_proc kp;
859 int pid = ptid_get_pid (thr->ptid);
860 long lwp = ptid_get_lwp (thr->ptid);
861 static char buf[sizeof pl.pl_tdname + 1];
863 /* Note that ptrace_lwpinfo returns the process command in pl_tdname
864 if a name has not been set explicitly. Return a NULL name in
866 if (!fbsd_fetch_kinfo_proc (pid, &kp))
867 perror_with_name (_("Failed to fetch process information"));
868 if (ptrace (PT_LWPINFO, lwp, (caddr_t) &pl, sizeof pl) == -1)
869 perror_with_name (("ptrace"));
870 if (strcmp (kp.ki_comm, pl.pl_tdname) == 0)
872 xsnprintf (buf, sizeof buf, "%s", pl.pl_tdname);
877 /* Enable additional event reporting on new processes.
879 To catch fork events, PTRACE_FORK is set on every traced process
880 to enable stops on returns from fork or vfork. Note that both the
881 parent and child will always stop, even if system call stops are
884 To catch LWP events, PTRACE_EVENTS is set on every traced process.
885 This enables stops on the birth for new LWPs (excluding the "main" LWP)
886 and the death of LWPs (excluding the last LWP in a process). Note
887 that unlike fork events, the LWP that creates a new LWP does not
891 fbsd_enable_proc_events (pid_t pid)
893 #ifdef PT_GET_EVENT_MASK
896 if (ptrace (PT_GET_EVENT_MASK, pid, (PTRACE_TYPE_ARG3)&events,
897 sizeof (events)) == -1)
898 perror_with_name (("ptrace"));
899 events |= PTRACE_FORK | PTRACE_LWP;
901 events |= PTRACE_VFORK;
903 if (ptrace (PT_SET_EVENT_MASK, pid, (PTRACE_TYPE_ARG3)&events,
904 sizeof (events)) == -1)
905 perror_with_name (("ptrace"));
908 if (ptrace (PT_FOLLOW_FORK, pid, (PTRACE_TYPE_ARG3)0, 1) == -1)
909 perror_with_name (("ptrace"));
912 if (ptrace (PT_LWP_EVENTS, pid, (PTRACE_TYPE_ARG3)0, 1) == -1)
913 perror_with_name (("ptrace"));
918 /* Add threads for any new LWPs in a process.
920 When LWP events are used, this function is only used to detect existing
921 threads when attaching to a process. On older systems, this function is
922 called to discover new threads each time the thread list is updated. */
925 fbsd_add_threads (pid_t pid)
929 gdb_assert (!in_thread_list (pid_to_ptid (pid)));
930 nlwps = ptrace (PT_GETNUMLWPS, pid, NULL, 0);
932 perror_with_name (("ptrace"));
934 gdb::unique_xmalloc_ptr<lwpid_t[]> lwps (XCNEWVEC (lwpid_t, nlwps));
936 nlwps = ptrace (PT_GETLWPLIST, pid, (caddr_t) lwps.get (), nlwps);
938 perror_with_name (("ptrace"));
940 for (i = 0; i < nlwps; i++)
942 ptid_t ptid = ptid_t (pid, lwps[i], 0);
944 if (!in_thread_list (ptid))
947 struct ptrace_lwpinfo pl;
949 /* Don't add exited threads. Note that this is only called
950 when attaching to a multi-threaded process. */
951 if (ptrace (PT_LWPINFO, lwps[i], (caddr_t) &pl, sizeof pl) == -1)
952 perror_with_name (("ptrace"));
953 if (pl.pl_flags & PL_FLAG_EXITED)
957 fprintf_unfiltered (gdb_stdlog,
958 "FLWP: adding thread for LWP %u\n",
965 /* Implement the "update_thread_list" target_ops method. */
968 fbsd_nat_target::update_thread_list ()
971 /* With support for thread events, threads are added/deleted from the
972 list as events are reported, so just try deleting exited threads. */
973 delete_exited_threads ();
977 fbsd_add_threads (ptid_get_pid (inferior_ptid));
983 To catch fork events, PT_FOLLOW_FORK is set on every traced process
984 to enable stops on returns from fork or vfork. Note that both the
985 parent and child will always stop, even if system call stops are not
988 After a fork, both the child and parent process will stop and report
989 an event. However, there is no guarantee of order. If the parent
990 reports its stop first, then fbsd_wait explicitly waits for the new
991 child before returning. If the child reports its stop first, then
992 the event is saved on a list and ignored until the parent's stop is
993 reported. fbsd_wait could have been changed to fetch the parent PID
994 of the new child and used that to wait for the parent explicitly.
995 However, if two threads in the parent fork at the same time, then
996 the wait on the parent might return the "wrong" fork event.
998 The initial version of PT_FOLLOW_FORK did not set PL_FLAG_CHILD for
999 the new child process. This flag could be inferred by treating any
1000 events for an unknown pid as a new child.
1002 In addition, the initial version of PT_FOLLOW_FORK did not report a
1003 stop event for the parent process of a vfork until after the child
1004 process executed a new program or exited. The kernel was changed to
1005 defer the wait for exit or exec of the child until after posting the
1006 stop event shortly after the change to introduce PL_FLAG_CHILD.
1007 This could be worked around by reporting a vfork event when the
1008 child event posted and ignoring the subsequent event from the
1011 This implementation requires both of these fixes for simplicity's
1012 sake. FreeBSD versions newer than 9.1 contain both fixes.
1015 static std::list<ptid_t> fbsd_pending_children;
1017 /* Record a new child process event that is reported before the
1018 corresponding fork event in the parent. */
1021 fbsd_remember_child (ptid_t pid)
1023 fbsd_pending_children.push_front (pid);
1026 /* Check for a previously-recorded new child process event for PID.
1027 If one is found, remove it from the list and return the PTID. */
1030 fbsd_is_child_pending (pid_t pid)
1032 for (auto it = fbsd_pending_children.begin ();
1033 it != fbsd_pending_children.end (); it++)
1034 if (it->pid () == pid)
1037 fbsd_pending_children.erase (it);
1043 #ifndef PTRACE_VFORK
1044 static std::forward_list<ptid_t> fbsd_pending_vfork_done;
1046 /* Record a pending vfork done event. */
1049 fbsd_add_vfork_done (ptid_t pid)
1051 fbsd_pending_vfork_done.push_front (pid);
1054 /* Check for a pending vfork done event for a specific PID. */
1057 fbsd_is_vfork_done_pending (pid_t pid)
1059 for (auto it = fbsd_pending_vfork_done.begin ();
1060 it != fbsd_pending_vfork_done.end (); it++)
1061 if (it->pid () == pid)
1066 /* Check for a pending vfork done event. If one is found, remove it
1067 from the list and return the PTID. */
1070 fbsd_next_vfork_done (void)
1072 if (!fbsd_pending_vfork_done.empty ())
1074 ptid_t ptid = fbsd_pending_vfork_done.front ();
1075 fbsd_pending_vfork_done.pop_front ();
1083 /* Implement the "resume" target_ops method. */
1086 fbsd_nat_target::resume (ptid_t ptid, int step, enum gdb_signal signo)
1088 #if defined(TDP_RFPPWAIT) && !defined(PTRACE_VFORK)
1091 /* Don't PT_CONTINUE a process which has a pending vfork done event. */
1092 if (ptid_equal (minus_one_ptid, ptid))
1093 pid = ptid_get_pid (inferior_ptid);
1095 pid = ptid_get_pid (ptid);
1096 if (fbsd_is_vfork_done_pending (pid))
1101 fprintf_unfiltered (gdb_stdlog,
1102 "FLWP: fbsd_resume for ptid (%d, %ld, %ld)\n",
1103 ptid_get_pid (ptid), ptid_get_lwp (ptid),
1104 ptid_get_tid (ptid));
1105 if (ptid_lwp_p (ptid))
1107 /* If ptid is a specific LWP, suspend all other LWPs in the process. */
1108 struct thread_info *tp;
1111 ALL_NON_EXITED_THREADS (tp)
1113 if (ptid_get_pid (tp->ptid) != ptid_get_pid (ptid))
1116 if (ptid_get_lwp (tp->ptid) == ptid_get_lwp (ptid))
1117 request = PT_RESUME;
1119 request = PT_SUSPEND;
1121 if (ptrace (request, ptid_get_lwp (tp->ptid), NULL, 0) == -1)
1122 perror_with_name (("ptrace"));
1127 /* If ptid is a wildcard, resume all matching threads (they won't run
1128 until the process is continued however). */
1129 struct thread_info *tp;
1131 ALL_NON_EXITED_THREADS (tp)
1133 if (!ptid_match (tp->ptid, ptid))
1136 if (ptrace (PT_RESUME, ptid_get_lwp (tp->ptid), NULL, 0) == -1)
1137 perror_with_name (("ptrace"));
1139 ptid = inferior_ptid;
1142 #if __FreeBSD_version < 1200052
1143 /* When multiple threads within a process wish to report STOPPED
1144 events from wait(), the kernel picks one thread event as the
1145 thread event to report. The chosen thread event is retrieved via
1146 PT_LWPINFO by passing the process ID as the request pid. If
1147 multiple events are pending, then the subsequent wait() after
1148 resuming a process will report another STOPPED event after
1149 resuming the process to handle the next thread event and so on.
1151 A single thread event is cleared as a side effect of resuming the
1152 process with PT_CONTINUE, PT_STEP, etc. In older kernels,
1153 however, the request pid was used to select which thread's event
1154 was cleared rather than always clearing the event that was just
1155 reported. To avoid clearing the event of the wrong LWP, always
1156 pass the process ID instead of an LWP ID to PT_CONTINUE or
1159 In the case of stepping, the process ID cannot be used with
1160 PT_STEP since it would step the thread that reported an event
1161 which may not be the thread indicated by PTID. For stepping, use
1162 PT_SETSTEP to enable stepping on the desired thread before
1163 resuming the process via PT_CONTINUE instead of using
1167 if (ptrace (PT_SETSTEP, get_ptrace_pid (ptid), NULL, 0) == -1)
1168 perror_with_name (("ptrace"));
1171 ptid = ptid_t (ptid.pid ());
1173 inf_ptrace_target::resume (ptid, step, signo);
1176 #ifdef USE_SIGTRAP_SIGINFO
1177 /* Handle breakpoint and trace traps reported via SIGTRAP. If the
1178 trap was a breakpoint or trace trap that should be reported to the
1179 core, return true. */
1182 fbsd_handle_debug_trap (ptid_t ptid, const struct ptrace_lwpinfo &pl)
1185 /* Ignore traps without valid siginfo or for signals other than
1187 if (! (pl.pl_flags & PL_FLAG_SI) || pl.pl_siginfo.si_signo != SIGTRAP)
1190 /* Trace traps are either a single step or a hardware watchpoint or
1192 if (pl.pl_siginfo.si_code == TRAP_TRACE)
1195 fprintf_unfiltered (gdb_stdlog,
1196 "FNAT: trace trap for LWP %ld\n", ptid.lwp ());
1200 if (pl.pl_siginfo.si_code == TRAP_BRKPT)
1202 /* Fixup PC for the software breakpoint. */
1203 struct regcache *regcache = get_thread_regcache (ptid);
1204 struct gdbarch *gdbarch = regcache->arch ();
1205 int decr_pc = gdbarch_decr_pc_after_break (gdbarch);
1208 fprintf_unfiltered (gdb_stdlog,
1209 "FNAT: sw breakpoint trap for LWP %ld\n",
1215 pc = regcache_read_pc (regcache);
1216 regcache_write_pc (regcache, pc - decr_pc);
1225 /* Wait for the child specified by PTID to do something. Return the
1226 process ID of the child, or MINUS_ONE_PTID in case of error; store
1227 the status in *OURSTATUS. */
1230 fbsd_nat_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus,
1237 #ifndef PTRACE_VFORK
1238 wptid = fbsd_next_vfork_done ();
1239 if (!ptid_equal (wptid, null_ptid))
1241 ourstatus->kind = TARGET_WAITKIND_VFORK_DONE;
1245 wptid = inf_ptrace_target::wait (ptid, ourstatus, target_options);
1246 if (ourstatus->kind == TARGET_WAITKIND_STOPPED)
1248 struct ptrace_lwpinfo pl;
1252 pid = ptid_get_pid (wptid);
1253 if (ptrace (PT_LWPINFO, pid, (caddr_t) &pl, sizeof pl) == -1)
1254 perror_with_name (("ptrace"));
1256 wptid = ptid_t (pid, pl.pl_lwpid, 0);
1260 fprintf_unfiltered (gdb_stdlog,
1261 "FNAT: stop for LWP %u event %d flags %#x\n",
1262 pl.pl_lwpid, pl.pl_event, pl.pl_flags);
1263 if (pl.pl_flags & PL_FLAG_SI)
1264 fprintf_unfiltered (gdb_stdlog,
1265 "FNAT: si_signo %u si_code %u\n",
1266 pl.pl_siginfo.si_signo,
1267 pl.pl_siginfo.si_code);
1270 #ifdef PT_LWP_EVENTS
1271 if (pl.pl_flags & PL_FLAG_EXITED)
1273 /* If GDB attaches to a multi-threaded process, exiting
1274 threads might be skipped during post_attach that
1275 have not yet reported their PL_FLAG_EXITED event.
1276 Ignore EXITED events for an unknown LWP. */
1277 thread_info *thr = find_thread_ptid (wptid);
1281 fprintf_unfiltered (gdb_stdlog,
1282 "FLWP: deleting thread for LWP %u\n",
1284 if (print_thread_events)
1285 printf_unfiltered (_("[%s exited]\n"), target_pid_to_str
1287 delete_thread (thr);
1289 if (ptrace (PT_CONTINUE, pid, (caddr_t) 1, 0) == -1)
1290 perror_with_name (("ptrace"));
1295 /* Switch to an LWP PTID on the first stop in a new process.
1296 This is done after handling PL_FLAG_EXITED to avoid
1297 switching to an exited LWP. It is done before checking
1298 PL_FLAG_BORN in case the first stop reported after
1299 attaching to an existing process is a PL_FLAG_BORN
1301 if (in_thread_list (pid_to_ptid (pid)))
1304 fprintf_unfiltered (gdb_stdlog,
1305 "FLWP: using LWP %u for first thread\n",
1307 thread_change_ptid (pid_to_ptid (pid), wptid);
1310 #ifdef PT_LWP_EVENTS
1311 if (pl.pl_flags & PL_FLAG_BORN)
1313 /* If GDB attaches to a multi-threaded process, newborn
1314 threads might be added by fbsd_add_threads that have
1315 not yet reported their PL_FLAG_BORN event. Ignore
1316 BORN events for an already-known LWP. */
1317 if (!in_thread_list (wptid))
1320 fprintf_unfiltered (gdb_stdlog,
1321 "FLWP: adding thread for LWP %u\n",
1325 ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
1331 if (pl.pl_flags & PL_FLAG_FORKED)
1333 #ifndef PTRACE_VFORK
1334 struct kinfo_proc kp;
1339 child = pl.pl_child_pid;
1340 ourstatus->kind = TARGET_WAITKIND_FORKED;
1342 if (pl.pl_flags & PL_FLAG_VFORKED)
1343 ourstatus->kind = TARGET_WAITKIND_VFORKED;
1346 /* Make sure the other end of the fork is stopped too. */
1347 child_ptid = fbsd_is_child_pending (child);
1348 if (ptid_equal (child_ptid, null_ptid))
1350 pid = waitpid (child, &status, 0);
1352 perror_with_name (("waitpid"));
1354 gdb_assert (pid == child);
1356 if (ptrace (PT_LWPINFO, child, (caddr_t)&pl, sizeof pl) == -1)
1357 perror_with_name (("ptrace"));
1359 gdb_assert (pl.pl_flags & PL_FLAG_CHILD);
1360 child_ptid = ptid_t (child, pl.pl_lwpid, 0);
1363 /* Enable additional events on the child process. */
1364 fbsd_enable_proc_events (ptid_get_pid (child_ptid));
1366 #ifndef PTRACE_VFORK
1367 /* For vfork, the child process will have the P_PPWAIT
1369 if (fbsd_fetch_kinfo_proc (child, &kp))
1371 if (kp.ki_flag & P_PPWAIT)
1372 ourstatus->kind = TARGET_WAITKIND_VFORKED;
1375 warning (_("Failed to fetch process information"));
1377 ourstatus->value.related_pid = child_ptid;
1382 if (pl.pl_flags & PL_FLAG_CHILD)
1384 /* Remember that this child forked, but do not report it
1385 until the parent reports its corresponding fork
1387 fbsd_remember_child (wptid);
1392 if (pl.pl_flags & PL_FLAG_VFORK_DONE)
1394 ourstatus->kind = TARGET_WAITKIND_VFORK_DONE;
1401 if (pl.pl_flags & PL_FLAG_EXEC)
1403 ourstatus->kind = TARGET_WAITKIND_EXECD;
1404 ourstatus->value.execd_pathname
1405 = xstrdup (pid_to_exec_file (pid));
1410 #ifdef USE_SIGTRAP_SIGINFO
1411 if (fbsd_handle_debug_trap (wptid, pl))
1415 /* Note that PL_FLAG_SCE is set for any event reported while
1416 a thread is executing a system call in the kernel. In
1417 particular, signals that interrupt a sleep in a system
1418 call will report this flag as part of their event. Stops
1419 explicitly for system call entry and exit always use
1420 SIGTRAP, so only treat SIGTRAP events as system call
1421 entry/exit events. */
1422 if (pl.pl_flags & (PL_FLAG_SCE | PL_FLAG_SCX)
1423 && ourstatus->value.sig == SIGTRAP)
1425 #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE
1426 if (catch_syscall_enabled ())
1428 if (catching_syscall_number (pl.pl_syscall_code))
1430 if (pl.pl_flags & PL_FLAG_SCE)
1431 ourstatus->kind = TARGET_WAITKIND_SYSCALL_ENTRY;
1433 ourstatus->kind = TARGET_WAITKIND_SYSCALL_RETURN;
1434 ourstatus->value.syscall_number = pl.pl_syscall_code;
1439 /* If the core isn't interested in this event, just
1440 continue the process explicitly and wait for another
1441 event. Note that PT_SYSCALL is "sticky" on FreeBSD
1442 and once system call stops are enabled on a process
1443 it stops for all system call entries and exits. */
1444 if (ptrace (PT_CONTINUE, pid, (caddr_t) 1, 0) == -1)
1445 perror_with_name (("ptrace"));
1453 #ifdef USE_SIGTRAP_SIGINFO
1454 /* Implement the "stopped_by_sw_breakpoint" target_ops method. */
1457 fbsd_nat_target::stopped_by_sw_breakpoint ()
1459 struct ptrace_lwpinfo pl;
1461 if (ptrace (PT_LWPINFO, get_ptrace_pid (inferior_ptid), (caddr_t) &pl,
1465 return ((pl.pl_flags & PL_FLAG_SI)
1466 && pl.pl_siginfo.si_signo == SIGTRAP
1467 && pl.pl_siginfo.si_code == TRAP_BRKPT);
1470 /* Implement the "supports_stopped_by_sw_breakpoint" target_ops
1474 fbsd_nat_target::supports_stopped_by_sw_breakpoint ()
1481 /* Target hook for follow_fork. On entry and at return inferior_ptid is
1482 the ptid of the followed inferior. */
1485 fbsd_nat_target::follow_fork (int follow_child, int detach_fork)
1487 if (!follow_child && detach_fork)
1489 struct thread_info *tp = inferior_thread ();
1490 pid_t child_pid = ptid_get_pid (tp->pending_follow.value.related_pid);
1492 /* Breakpoints have already been detached from the child by
1495 if (ptrace (PT_DETACH, child_pid, (PTRACE_TYPE_ARG3)1, 0) == -1)
1496 perror_with_name (("ptrace"));
1498 #ifndef PTRACE_VFORK
1499 if (tp->pending_follow.kind == TARGET_WAITKIND_VFORKED)
1501 /* We can't insert breakpoints until the child process has
1502 finished with the shared memory region. The parent
1503 process doesn't wait for the child process to exit or
1504 exec until after it has been resumed from the ptrace stop
1505 to report the fork. Once it has been resumed it doesn't
1506 stop again before returning to userland, so there is no
1507 reliable way to wait on the parent.
1509 We can't stay attached to the child to wait for an exec
1510 or exit because it may invoke ptrace(PT_TRACE_ME)
1511 (e.g. if the parent process is a debugger forking a new
1514 In the end, the best we can do is to make sure it runs
1515 for a little while. Hopefully it will be out of range of
1516 any breakpoints we reinsert. Usually this is only the
1517 single-step breakpoint at vfork's return point. */
1521 /* Schedule a fake VFORK_DONE event to report on the next
1523 fbsd_add_vfork_done (inferior_ptid);
1532 fbsd_nat_target::insert_fork_catchpoint (int pid)
1538 fbsd_nat_target::remove_fork_catchpoint (int pid)
1544 fbsd_nat_target::insert_vfork_catchpoint (int pid)
1550 fbsd_nat_target::remove_vfork_catchpoint (int pid)
1556 /* Implement the "post_startup_inferior" target_ops method. */
1559 fbsd_nat_target::post_startup_inferior (ptid_t pid)
1561 fbsd_enable_proc_events (ptid_get_pid (pid));
1564 /* Implement the "post_attach" target_ops method. */
1567 fbsd_nat_target::post_attach (int pid)
1569 fbsd_enable_proc_events (pid);
1570 fbsd_add_threads (pid);
1574 /* If the FreeBSD kernel supports PL_FLAG_EXEC, then traced processes
1575 will always stop after exec. */
1578 fbsd_nat_target::insert_exec_catchpoint (int pid)
1584 fbsd_nat_target::remove_exec_catchpoint (int pid)
1590 #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE
1592 fbsd_nat_target::set_syscall_catchpoint (int pid, bool needed,
1594 gdb::array_view<const int> syscall_counts)
1597 /* Ignore the arguments. inf-ptrace.c will use PT_SYSCALL which
1598 will catch all system call entries and exits. The system calls
1599 are filtered by GDB rather than the kernel. */
1606 _initialize_fbsd_nat (void)
1609 add_setshow_boolean_cmd ("fbsd-lwp", class_maintenance,
1610 &debug_fbsd_lwp, _("\
1611 Set debugging of FreeBSD lwp module."), _("\
1612 Show debugging of FreeBSD lwp module."), _("\
1613 Enables printf debugging output."),
1615 &show_fbsd_lwp_debug,
1616 &setdebuglist, &showdebuglist);
1617 add_setshow_boolean_cmd ("fbsd-nat", class_maintenance,
1618 &debug_fbsd_nat, _("\
1619 Set debugging of FreeBSD native target."), _("\
1620 Show debugging of FreeBSD native target."), _("\
1621 Enables printf debugging output."),
1623 &show_fbsd_nat_debug,
1624 &setdebuglist, &showdebuglist);