1 /* Native-dependent code for FreeBSD.
3 Copyright (C) 2002-2019 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 "common/byte-vector.h"
27 #include "gdbthread.h"
28 #include "common/gdb_wait.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 "common/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 = inferior_ptid.pid ();
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 = inferior_ptid.pid ();
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)
234 /* Join the arguments with spaces to form a single string. */
235 char *cp = cmdline.get ();
236 for (size_t i = 0; i < len - 1; i++)
244 /* Fetch the external variant of the kernel's internal process
245 structure for the process PID into KP. */
248 fbsd_fetch_kinfo_proc (pid_t pid, struct kinfo_proc *kp)
256 mib[2] = KERN_PROC_PID;
258 return (sysctl (mib, 4, kp, &len, NULL, 0) == 0);
261 /* Implement the "info_proc" target_ops method. */
264 fbsd_nat_target::info_proc (const char *args, enum info_proc_what what)
266 #ifdef HAVE_KINFO_GETFILE
267 gdb::unique_xmalloc_ptr<struct kinfo_file> fdtbl;
270 struct kinfo_proc kp;
272 bool do_cmdline = false;
275 #ifdef HAVE_KINFO_GETFILE
276 bool do_files = false;
278 #ifdef HAVE_KINFO_GETVMMAP
279 bool do_mappings = false;
281 bool do_status = false;
290 #ifdef HAVE_KINFO_GETVMMAP
308 #ifdef HAVE_KINFO_GETFILE
317 #ifdef HAVE_KINFO_GETFILE
320 #ifdef HAVE_KINFO_GETVMMAP
326 error (_("Not supported on this target."));
329 gdb_argv built_argv (args);
330 if (built_argv.count () == 0)
332 pid = inferior_ptid.pid ();
334 error (_("No current process: you must name one."));
336 else if (built_argv.count () == 1 && isdigit (built_argv[0][0]))
337 pid = strtol (built_argv[0], NULL, 10);
339 error (_("Invalid arguments."));
341 printf_filtered (_("process %d\n"), pid);
342 #ifdef HAVE_KINFO_GETFILE
343 if (do_cwd || do_exe || do_files)
344 fdtbl.reset (kinfo_getfile (pid, &nfd));
349 gdb::unique_xmalloc_ptr<char> cmdline = fbsd_fetch_cmdline (pid);
350 if (cmdline != nullptr)
351 printf_filtered ("cmdline = '%s'\n", cmdline.get ());
353 warning (_("unable to fetch command line"));
357 const char *cwd = NULL;
358 #ifdef HAVE_KINFO_GETFILE
359 struct kinfo_file *kf = fdtbl.get ();
360 for (int i = 0; i < nfd; i++, kf++)
362 if (kf->kf_type == KF_TYPE_VNODE && kf->kf_fd == KF_FD_TYPE_CWD)
370 printf_filtered ("cwd = '%s'\n", cwd);
372 warning (_("unable to fetch current working directory"));
376 const char *exe = NULL;
377 #ifdef HAVE_KINFO_GETFILE
378 struct kinfo_file *kf = fdtbl.get ();
379 for (int i = 0; i < nfd; i++, kf++)
381 if (kf->kf_type == KF_TYPE_VNODE && kf->kf_fd == KF_FD_TYPE_TEXT)
389 exe = pid_to_exec_file (pid);
391 printf_filtered ("exe = '%s'\n", exe);
393 warning (_("unable to fetch executable path name"));
395 #ifdef HAVE_KINFO_GETFILE
398 struct kinfo_file *kf = fdtbl.get ();
402 fbsd_info_proc_files_header ();
403 for (int i = 0; i < nfd; i++, kf++)
404 fbsd_info_proc_files_entry (kf->kf_type, kf->kf_fd, kf->kf_flags,
405 kf->kf_offset, kf->kf_vnode_type,
406 kf->kf_sock_domain, kf->kf_sock_type,
407 kf->kf_sock_protocol, &kf->kf_sa_local,
408 &kf->kf_sa_peer, kf->kf_path);
411 warning (_("unable to fetch list of open files"));
414 #ifdef HAVE_KINFO_GETVMMAP
418 gdb::unique_xmalloc_ptr<struct kinfo_vmentry>
419 vmentl (kinfo_getvmmap (pid, &nvment));
421 if (vmentl != nullptr)
423 int addr_bit = TARGET_CHAR_BIT * sizeof (void *);
424 fbsd_info_proc_mappings_header (addr_bit);
426 struct kinfo_vmentry *kve = vmentl.get ();
427 for (int i = 0; i < nvment; i++, kve++)
428 fbsd_info_proc_mappings_entry (addr_bit, kve->kve_start,
429 kve->kve_end, kve->kve_offset,
430 kve->kve_flags, kve->kve_protection,
434 warning (_("unable to fetch virtual memory map"));
439 if (!fbsd_fetch_kinfo_proc (pid, &kp))
440 warning (_("Failed to fetch process information"));
446 printf_filtered ("Name: %s\n", kp.ki_comm);
453 state = "R (running)";
456 state = "T (stopped)";
459 state = "Z (zombie)";
462 state = "S (sleeping)";
465 state = "W (interrupt wait)";
468 state = "L (blocked on lock)";
471 state = "? (unknown)";
474 printf_filtered ("State: %s\n", state);
475 printf_filtered ("Parent process: %d\n", kp.ki_ppid);
476 printf_filtered ("Process group: %d\n", kp.ki_pgid);
477 printf_filtered ("Session id: %d\n", kp.ki_sid);
478 printf_filtered ("TTY: %ju\n", (uintmax_t) kp.ki_tdev);
479 printf_filtered ("TTY owner process group: %d\n", kp.ki_tpgid);
480 printf_filtered ("User IDs (real, effective, saved): %d %d %d\n",
481 kp.ki_ruid, kp.ki_uid, kp.ki_svuid);
482 printf_filtered ("Group IDs (real, effective, saved): %d %d %d\n",
483 kp.ki_rgid, kp.ki_groups[0], kp.ki_svgid);
484 printf_filtered ("Groups: ");
485 for (int i = 0; i < kp.ki_ngroups; i++)
486 printf_filtered ("%d ", kp.ki_groups[i]);
487 printf_filtered ("\n");
488 printf_filtered ("Minor faults (no memory page): %ld\n",
489 kp.ki_rusage.ru_minflt);
490 printf_filtered ("Minor faults, children: %ld\n",
491 kp.ki_rusage_ch.ru_minflt);
492 printf_filtered ("Major faults (memory page faults): %ld\n",
493 kp.ki_rusage.ru_majflt);
494 printf_filtered ("Major faults, children: %ld\n",
495 kp.ki_rusage_ch.ru_majflt);
496 printf_filtered ("utime: %jd.%06ld\n",
497 (intmax_t) kp.ki_rusage.ru_utime.tv_sec,
498 kp.ki_rusage.ru_utime.tv_usec);
499 printf_filtered ("stime: %jd.%06ld\n",
500 (intmax_t) kp.ki_rusage.ru_stime.tv_sec,
501 kp.ki_rusage.ru_stime.tv_usec);
502 printf_filtered ("utime, children: %jd.%06ld\n",
503 (intmax_t) kp.ki_rusage_ch.ru_utime.tv_sec,
504 kp.ki_rusage_ch.ru_utime.tv_usec);
505 printf_filtered ("stime, children: %jd.%06ld\n",
506 (intmax_t) kp.ki_rusage_ch.ru_stime.tv_sec,
507 kp.ki_rusage_ch.ru_stime.tv_usec);
508 printf_filtered ("'nice' value: %d\n", kp.ki_nice);
509 printf_filtered ("Start time: %jd.%06ld\n", kp.ki_start.tv_sec,
510 kp.ki_start.tv_usec);
511 pgtok = getpagesize () / 1024;
512 printf_filtered ("Virtual memory size: %ju kB\n",
513 (uintmax_t) kp.ki_size / 1024);
514 printf_filtered ("Data size: %ju kB\n",
515 (uintmax_t) kp.ki_dsize * pgtok);
516 printf_filtered ("Stack size: %ju kB\n",
517 (uintmax_t) kp.ki_ssize * pgtok);
518 printf_filtered ("Text size: %ju kB\n",
519 (uintmax_t) kp.ki_tsize * pgtok);
520 printf_filtered ("Resident set size: %ju kB\n",
521 (uintmax_t) kp.ki_rssize * pgtok);
522 printf_filtered ("Maximum RSS: %ju kB\n",
523 (uintmax_t) kp.ki_rusage.ru_maxrss);
524 printf_filtered ("Pending Signals: ");
525 for (int i = 0; i < _SIG_WORDS; i++)
526 printf_filtered ("%08x ", kp.ki_siglist.__bits[i]);
527 printf_filtered ("\n");
528 printf_filtered ("Ignored Signals: ");
529 for (int i = 0; i < _SIG_WORDS; i++)
530 printf_filtered ("%08x ", kp.ki_sigignore.__bits[i]);
531 printf_filtered ("\n");
532 printf_filtered ("Caught Signals: ");
533 for (int i = 0; i < _SIG_WORDS; i++)
534 printf_filtered ("%08x ", kp.ki_sigcatch.__bits[i]);
535 printf_filtered ("\n");
543 * The current layout of siginfo_t on FreeBSD was adopted in SVN
544 * revision 153154 which shipped in FreeBSD versions 7.0 and later.
545 * Don't bother supporting the older layout on older kernels. The
546 * older format was also never used in core dump notes.
548 #if __FreeBSD_version >= 700009
553 /* Return the size of siginfo for the current inferior. */
561 /* This structure matches the naming and layout of `siginfo_t' in
562 <sys/signal.h>. In particular, the `si_foo' macros defined in that
563 header can be used with both types to copy fields in the `_reason'
575 union sigval32 si_value;
608 struct gdbarch *gdbarch = get_frame_arch (get_current_frame ());
610 /* Is the inferior 32-bit? If so, use the 32-bit siginfo size. */
611 if (gdbarch_long_bit (gdbarch) == 32)
612 return sizeof (struct siginfo32);
614 return sizeof (siginfo_t);
617 /* Convert a native 64-bit siginfo object to a 32-bit object. Note
618 that FreeBSD doesn't support writing to $_siginfo, so this only
619 needs to convert one way. */
622 fbsd_convert_siginfo (siginfo_t *si)
625 struct gdbarch *gdbarch = get_frame_arch (get_current_frame ());
627 /* Is the inferior 32-bit? If not, nothing to do. */
628 if (gdbarch_long_bit (gdbarch) != 32)
631 struct siginfo32 si32;
633 si32.si_signo = si->si_signo;
634 si32.si_errno = si->si_errno;
635 si32.si_code = si->si_code;
636 si32.si_pid = si->si_pid;
637 si32.si_uid = si->si_uid;
638 si32.si_status = si->si_status;
639 si32.si_addr = (uintptr_t) si->si_addr;
641 /* If sival_ptr is being used instead of sival_int on a big-endian
642 platform, then sival_int will be zero since it holds the upper
643 32-bits of the pointer value. */
644 #if _BYTE_ORDER == _BIG_ENDIAN
645 if (si->si_value.sival_int == 0)
646 si32.si_value.sival_ptr = (uintptr_t) si->si_value.sival_ptr;
648 si32.si_value.sival_int = si->si_value.sival_int;
650 si32.si_value.sival_int = si->si_value.sival_int;
653 /* Always copy the spare fields and then possibly overwrite them for
654 signal-specific or code-specific fields. */
655 si32._reason.__spare__.__spare1__ = si->_reason.__spare__.__spare1__;
656 for (int i = 0; i < 7; i++)
657 si32._reason.__spare__.__spare2__[i] = si->_reason.__spare__.__spare2__[i];
658 switch (si->si_signo) {
663 si32.si_trapno = si->si_trapno;
666 switch (si->si_code) {
668 si32.si_timerid = si->si_timerid;
669 si32.si_overrun = si->si_overrun;
672 si32.si_mqd = si->si_mqd;
676 memcpy(si, &si32, sizeof (si32));
681 /* Implement the "xfer_partial" target_ops method. */
683 enum target_xfer_status
684 fbsd_nat_target::xfer_partial (enum target_object object,
685 const char *annex, gdb_byte *readbuf,
686 const gdb_byte *writebuf,
687 ULONGEST offset, ULONGEST len,
688 ULONGEST *xfered_len)
690 pid_t pid = inferior_ptid.pid ();
695 case TARGET_OBJECT_SIGNAL_INFO:
697 struct ptrace_lwpinfo pl;
700 /* FreeBSD doesn't support writing to $_siginfo. */
701 if (writebuf != NULL)
702 return TARGET_XFER_E_IO;
704 if (inferior_ptid.lwp_p ())
705 pid = inferior_ptid.lwp ();
707 siginfo_size = fbsd_siginfo_size ();
708 if (offset > siginfo_size)
709 return TARGET_XFER_E_IO;
711 if (ptrace (PT_LWPINFO, pid, (PTRACE_TYPE_ARG3) &pl, sizeof (pl)) == -1)
712 return TARGET_XFER_E_IO;
714 if (!(pl.pl_flags & PL_FLAG_SI))
715 return TARGET_XFER_E_IO;
717 fbsd_convert_siginfo (&pl.pl_siginfo);
718 if (offset + len > siginfo_size)
719 len = siginfo_size - offset;
721 memcpy (readbuf, ((gdb_byte *) &pl.pl_siginfo) + offset, len);
723 return TARGET_XFER_OK;
726 #ifdef KERN_PROC_AUXV
727 case TARGET_OBJECT_AUXV:
729 gdb::byte_vector buf_storage;
734 if (writebuf != NULL)
735 return TARGET_XFER_E_IO;
738 mib[2] = KERN_PROC_AUXV;
747 buflen = offset + len;
748 buf_storage.resize (buflen);
749 buf = buf_storage.data ();
751 if (sysctl (mib, 4, buf, &buflen, NULL, 0) == 0)
758 memcpy (readbuf, buf + offset, buflen);
763 *xfered_len = buflen;
764 return (buflen == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK;
766 return TARGET_XFER_E_IO;
769 #if defined(KERN_PROC_VMMAP) && defined(KERN_PROC_PS_STRINGS)
770 case TARGET_OBJECT_FREEBSD_VMMAP:
771 case TARGET_OBJECT_FREEBSD_PS_STRINGS:
773 gdb::byte_vector buf_storage;
779 uint32_t struct_size;
782 case TARGET_OBJECT_FREEBSD_VMMAP:
783 proc_target = KERN_PROC_VMMAP;
784 struct_size = sizeof (struct kinfo_vmentry);
786 case TARGET_OBJECT_FREEBSD_PS_STRINGS:
787 proc_target = KERN_PROC_PS_STRINGS;
788 struct_size = sizeof (void *);
792 if (writebuf != NULL)
793 return TARGET_XFER_E_IO;
797 mib[2] = proc_target;
800 if (sysctl (mib, 4, NULL, &buflen, NULL, 0) != 0)
801 return TARGET_XFER_E_IO;
802 buflen += sizeof (struct_size);
804 if (offset >= buflen)
807 return TARGET_XFER_EOF;
810 buf_storage.resize (buflen);
811 buf = buf_storage.data ();
813 memcpy (buf, &struct_size, sizeof (struct_size));
814 buflen -= sizeof (struct_size);
815 if (sysctl (mib, 4, buf + sizeof (struct_size), &buflen, NULL, 0) != 0)
816 return TARGET_XFER_E_IO;
817 buflen += sizeof (struct_size);
819 if (buflen - offset < len)
820 len = buflen - offset;
821 memcpy (readbuf, buf + offset, len);
823 return TARGET_XFER_OK;
827 return inf_ptrace_target::xfer_partial (object, annex,
828 readbuf, writebuf, offset,
834 static int debug_fbsd_lwp;
835 static int debug_fbsd_nat;
838 show_fbsd_lwp_debug (struct ui_file *file, int from_tty,
839 struct cmd_list_element *c, const char *value)
841 fprintf_filtered (file, _("Debugging of FreeBSD lwp module is %s.\n"), value);
845 show_fbsd_nat_debug (struct ui_file *file, int from_tty,
846 struct cmd_list_element *c, const char *value)
848 fprintf_filtered (file, _("Debugging of FreeBSD native target is %s.\n"),
853 FreeBSD's first thread support was via a "reentrant" version of libc
854 (libc_r) that first shipped in 2.2.7. This library multiplexed all
855 of the threads in a process onto a single kernel thread. This
856 library was supported via the bsd-uthread target.
858 FreeBSD 5.1 introduced two new threading libraries that made use of
859 multiple kernel threads. The first (libkse) scheduled M user
860 threads onto N (<= M) kernel threads (LWPs). The second (libthr)
861 bound each user thread to a dedicated kernel thread. libkse shipped
862 as the default threading library (libpthread).
864 FreeBSD 5.3 added a libthread_db to abstract the interface across
865 the various thread libraries (libc_r, libkse, and libthr).
867 FreeBSD 7.0 switched the default threading library from from libkse
868 to libpthread and removed libc_r.
870 FreeBSD 8.0 removed libkse and the in-kernel support for it. The
871 only threading library supported by 8.0 and later is libthr which
872 ties each user thread directly to an LWP. To simplify the
873 implementation, this target only supports LWP-backed threads using
874 ptrace directly rather than libthread_db.
876 FreeBSD 11.0 introduced LWP event reporting via PT_LWP_EVENTS.
879 /* Return true if PTID is still active in the inferior. */
882 fbsd_nat_target::thread_alive (ptid_t ptid)
886 struct ptrace_lwpinfo pl;
888 if (ptrace (PT_LWPINFO, ptid.lwp (), (caddr_t) &pl, sizeof pl)
891 #ifdef PL_FLAG_EXITED
892 if (pl.pl_flags & PL_FLAG_EXITED)
900 /* Convert PTID to a string. Returns the string in a static
904 fbsd_nat_target::pid_to_str (ptid_t ptid)
912 int pid = ptid.pid ();
914 xsnprintf (buf, sizeof buf, "LWP %d of process %d", lwp, pid);
918 return normal_pid_to_str (ptid);
921 #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME
922 /* Return the name assigned to a thread by an application. Returns
923 the string in a static buffer. */
926 fbsd_nat_target::thread_name (struct thread_info *thr)
928 struct ptrace_lwpinfo pl;
929 struct kinfo_proc kp;
930 int pid = thr->ptid.pid ();
931 long lwp = thr->ptid.lwp ();
932 static char buf[sizeof pl.pl_tdname + 1];
934 /* Note that ptrace_lwpinfo returns the process command in pl_tdname
935 if a name has not been set explicitly. Return a NULL name in
937 if (!fbsd_fetch_kinfo_proc (pid, &kp))
938 perror_with_name (_("Failed to fetch process information"));
939 if (ptrace (PT_LWPINFO, lwp, (caddr_t) &pl, sizeof pl) == -1)
940 perror_with_name (("ptrace"));
941 if (strcmp (kp.ki_comm, pl.pl_tdname) == 0)
943 xsnprintf (buf, sizeof buf, "%s", pl.pl_tdname);
948 /* Enable additional event reporting on new processes.
950 To catch fork events, PTRACE_FORK is set on every traced process
951 to enable stops on returns from fork or vfork. Note that both the
952 parent and child will always stop, even if system call stops are
955 To catch LWP events, PTRACE_EVENTS is set on every traced process.
956 This enables stops on the birth for new LWPs (excluding the "main" LWP)
957 and the death of LWPs (excluding the last LWP in a process). Note
958 that unlike fork events, the LWP that creates a new LWP does not
962 fbsd_enable_proc_events (pid_t pid)
964 #ifdef PT_GET_EVENT_MASK
967 if (ptrace (PT_GET_EVENT_MASK, pid, (PTRACE_TYPE_ARG3)&events,
968 sizeof (events)) == -1)
969 perror_with_name (("ptrace"));
970 events |= PTRACE_FORK | PTRACE_LWP;
972 events |= PTRACE_VFORK;
974 if (ptrace (PT_SET_EVENT_MASK, pid, (PTRACE_TYPE_ARG3)&events,
975 sizeof (events)) == -1)
976 perror_with_name (("ptrace"));
979 if (ptrace (PT_FOLLOW_FORK, pid, (PTRACE_TYPE_ARG3)0, 1) == -1)
980 perror_with_name (("ptrace"));
983 if (ptrace (PT_LWP_EVENTS, pid, (PTRACE_TYPE_ARG3)0, 1) == -1)
984 perror_with_name (("ptrace"));
989 /* Add threads for any new LWPs in a process.
991 When LWP events are used, this function is only used to detect existing
992 threads when attaching to a process. On older systems, this function is
993 called to discover new threads each time the thread list is updated. */
996 fbsd_add_threads (pid_t pid)
1000 gdb_assert (!in_thread_list (ptid_t (pid)));
1001 nlwps = ptrace (PT_GETNUMLWPS, pid, NULL, 0);
1003 perror_with_name (("ptrace"));
1005 gdb::unique_xmalloc_ptr<lwpid_t[]> lwps (XCNEWVEC (lwpid_t, nlwps));
1007 nlwps = ptrace (PT_GETLWPLIST, pid, (caddr_t) lwps.get (), nlwps);
1009 perror_with_name (("ptrace"));
1011 for (i = 0; i < nlwps; i++)
1013 ptid_t ptid = ptid_t (pid, lwps[i], 0);
1015 if (!in_thread_list (ptid))
1017 #ifdef PT_LWP_EVENTS
1018 struct ptrace_lwpinfo pl;
1020 /* Don't add exited threads. Note that this is only called
1021 when attaching to a multi-threaded process. */
1022 if (ptrace (PT_LWPINFO, lwps[i], (caddr_t) &pl, sizeof pl) == -1)
1023 perror_with_name (("ptrace"));
1024 if (pl.pl_flags & PL_FLAG_EXITED)
1028 fprintf_unfiltered (gdb_stdlog,
1029 "FLWP: adding thread for LWP %u\n",
1036 /* Implement the "update_thread_list" target_ops method. */
1039 fbsd_nat_target::update_thread_list ()
1041 #ifdef PT_LWP_EVENTS
1042 /* With support for thread events, threads are added/deleted from the
1043 list as events are reported, so just try deleting exited threads. */
1044 delete_exited_threads ();
1048 fbsd_add_threads (inferior_ptid.pid ());
1054 To catch fork events, PT_FOLLOW_FORK is set on every traced process
1055 to enable stops on returns from fork or vfork. Note that both the
1056 parent and child will always stop, even if system call stops are not
1059 After a fork, both the child and parent process will stop and report
1060 an event. However, there is no guarantee of order. If the parent
1061 reports its stop first, then fbsd_wait explicitly waits for the new
1062 child before returning. If the child reports its stop first, then
1063 the event is saved on a list and ignored until the parent's stop is
1064 reported. fbsd_wait could have been changed to fetch the parent PID
1065 of the new child and used that to wait for the parent explicitly.
1066 However, if two threads in the parent fork at the same time, then
1067 the wait on the parent might return the "wrong" fork event.
1069 The initial version of PT_FOLLOW_FORK did not set PL_FLAG_CHILD for
1070 the new child process. This flag could be inferred by treating any
1071 events for an unknown pid as a new child.
1073 In addition, the initial version of PT_FOLLOW_FORK did not report a
1074 stop event for the parent process of a vfork until after the child
1075 process executed a new program or exited. The kernel was changed to
1076 defer the wait for exit or exec of the child until after posting the
1077 stop event shortly after the change to introduce PL_FLAG_CHILD.
1078 This could be worked around by reporting a vfork event when the
1079 child event posted and ignoring the subsequent event from the
1082 This implementation requires both of these fixes for simplicity's
1083 sake. FreeBSD versions newer than 9.1 contain both fixes.
1086 static std::list<ptid_t> fbsd_pending_children;
1088 /* Record a new child process event that is reported before the
1089 corresponding fork event in the parent. */
1092 fbsd_remember_child (ptid_t pid)
1094 fbsd_pending_children.push_front (pid);
1097 /* Check for a previously-recorded new child process event for PID.
1098 If one is found, remove it from the list and return the PTID. */
1101 fbsd_is_child_pending (pid_t pid)
1103 for (auto it = fbsd_pending_children.begin ();
1104 it != fbsd_pending_children.end (); it++)
1105 if (it->pid () == pid)
1108 fbsd_pending_children.erase (it);
1114 #ifndef PTRACE_VFORK
1115 static std::forward_list<ptid_t> fbsd_pending_vfork_done;
1117 /* Record a pending vfork done event. */
1120 fbsd_add_vfork_done (ptid_t pid)
1122 fbsd_pending_vfork_done.push_front (pid);
1125 /* Check for a pending vfork done event for a specific PID. */
1128 fbsd_is_vfork_done_pending (pid_t pid)
1130 for (auto it = fbsd_pending_vfork_done.begin ();
1131 it != fbsd_pending_vfork_done.end (); it++)
1132 if (it->pid () == pid)
1137 /* Check for a pending vfork done event. If one is found, remove it
1138 from the list and return the PTID. */
1141 fbsd_next_vfork_done (void)
1143 if (!fbsd_pending_vfork_done.empty ())
1145 ptid_t ptid = fbsd_pending_vfork_done.front ();
1146 fbsd_pending_vfork_done.pop_front ();
1154 /* Implement the "resume" target_ops method. */
1157 fbsd_nat_target::resume (ptid_t ptid, int step, enum gdb_signal signo)
1159 #if defined(TDP_RFPPWAIT) && !defined(PTRACE_VFORK)
1162 /* Don't PT_CONTINUE a process which has a pending vfork done event. */
1163 if (minus_one_ptid == ptid)
1164 pid = inferior_ptid.pid ();
1167 if (fbsd_is_vfork_done_pending (pid))
1172 fprintf_unfiltered (gdb_stdlog,
1173 "FLWP: fbsd_resume for ptid (%d, %ld, %ld)\n",
1174 ptid.pid (), ptid.lwp (),
1178 /* If ptid is a specific LWP, suspend all other LWPs in the process. */
1179 inferior *inf = find_inferior_ptid (ptid);
1181 for (thread_info *tp : inf->non_exited_threads ())
1185 if (tp->ptid.lwp () == ptid.lwp ())
1186 request = PT_RESUME;
1188 request = PT_SUSPEND;
1190 if (ptrace (request, tp->ptid.lwp (), NULL, 0) == -1)
1191 perror_with_name (("ptrace"));
1196 /* If ptid is a wildcard, resume all matching threads (they won't run
1197 until the process is continued however). */
1198 for (thread_info *tp : all_non_exited_threads (ptid))
1199 if (ptrace (PT_RESUME, tp->ptid.lwp (), NULL, 0) == -1)
1200 perror_with_name (("ptrace"));
1201 ptid = inferior_ptid;
1204 #if __FreeBSD_version < 1200052
1205 /* When multiple threads within a process wish to report STOPPED
1206 events from wait(), the kernel picks one thread event as the
1207 thread event to report. The chosen thread event is retrieved via
1208 PT_LWPINFO by passing the process ID as the request pid. If
1209 multiple events are pending, then the subsequent wait() after
1210 resuming a process will report another STOPPED event after
1211 resuming the process to handle the next thread event and so on.
1213 A single thread event is cleared as a side effect of resuming the
1214 process with PT_CONTINUE, PT_STEP, etc. In older kernels,
1215 however, the request pid was used to select which thread's event
1216 was cleared rather than always clearing the event that was just
1217 reported. To avoid clearing the event of the wrong LWP, always
1218 pass the process ID instead of an LWP ID to PT_CONTINUE or
1221 In the case of stepping, the process ID cannot be used with
1222 PT_STEP since it would step the thread that reported an event
1223 which may not be the thread indicated by PTID. For stepping, use
1224 PT_SETSTEP to enable stepping on the desired thread before
1225 resuming the process via PT_CONTINUE instead of using
1229 if (ptrace (PT_SETSTEP, get_ptrace_pid (ptid), NULL, 0) == -1)
1230 perror_with_name (("ptrace"));
1233 ptid = ptid_t (ptid.pid ());
1235 inf_ptrace_target::resume (ptid, step, signo);
1238 #ifdef USE_SIGTRAP_SIGINFO
1239 /* Handle breakpoint and trace traps reported via SIGTRAP. If the
1240 trap was a breakpoint or trace trap that should be reported to the
1241 core, return true. */
1244 fbsd_handle_debug_trap (ptid_t ptid, const struct ptrace_lwpinfo &pl)
1247 /* Ignore traps without valid siginfo or for signals other than
1250 FreeBSD kernels prior to r341800 can return stale siginfo for at
1251 least some events, but those events can be identified by
1252 additional flags set in pl_flags. True breakpoint and
1253 single-step traps should not have other flags set in
1255 if (pl.pl_flags != PL_FLAG_SI || pl.pl_siginfo.si_signo != SIGTRAP)
1258 /* Trace traps are either a single step or a hardware watchpoint or
1260 if (pl.pl_siginfo.si_code == TRAP_TRACE)
1263 fprintf_unfiltered (gdb_stdlog,
1264 "FNAT: trace trap for LWP %ld\n", ptid.lwp ());
1268 if (pl.pl_siginfo.si_code == TRAP_BRKPT)
1270 /* Fixup PC for the software breakpoint. */
1271 struct regcache *regcache = get_thread_regcache (ptid);
1272 struct gdbarch *gdbarch = regcache->arch ();
1273 int decr_pc = gdbarch_decr_pc_after_break (gdbarch);
1276 fprintf_unfiltered (gdb_stdlog,
1277 "FNAT: sw breakpoint trap for LWP %ld\n",
1283 pc = regcache_read_pc (regcache);
1284 regcache_write_pc (regcache, pc - decr_pc);
1293 /* Wait for the child specified by PTID to do something. Return the
1294 process ID of the child, or MINUS_ONE_PTID in case of error; store
1295 the status in *OURSTATUS. */
1298 fbsd_nat_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus,
1305 #ifndef PTRACE_VFORK
1306 wptid = fbsd_next_vfork_done ();
1307 if (wptid != null_ptid)
1309 ourstatus->kind = TARGET_WAITKIND_VFORK_DONE;
1313 wptid = inf_ptrace_target::wait (ptid, ourstatus, target_options);
1314 if (ourstatus->kind == TARGET_WAITKIND_STOPPED)
1316 struct ptrace_lwpinfo pl;
1321 if (ptrace (PT_LWPINFO, pid, (caddr_t) &pl, sizeof pl) == -1)
1322 perror_with_name (("ptrace"));
1324 wptid = ptid_t (pid, pl.pl_lwpid, 0);
1328 fprintf_unfiltered (gdb_stdlog,
1329 "FNAT: stop for LWP %u event %d flags %#x\n",
1330 pl.pl_lwpid, pl.pl_event, pl.pl_flags);
1331 if (pl.pl_flags & PL_FLAG_SI)
1332 fprintf_unfiltered (gdb_stdlog,
1333 "FNAT: si_signo %u si_code %u\n",
1334 pl.pl_siginfo.si_signo,
1335 pl.pl_siginfo.si_code);
1338 #ifdef PT_LWP_EVENTS
1339 if (pl.pl_flags & PL_FLAG_EXITED)
1341 /* If GDB attaches to a multi-threaded process, exiting
1342 threads might be skipped during post_attach that
1343 have not yet reported their PL_FLAG_EXITED event.
1344 Ignore EXITED events for an unknown LWP. */
1345 thread_info *thr = find_thread_ptid (wptid);
1349 fprintf_unfiltered (gdb_stdlog,
1350 "FLWP: deleting thread for LWP %u\n",
1352 if (print_thread_events)
1353 printf_unfiltered (_("[%s exited]\n"), target_pid_to_str
1355 delete_thread (thr);
1357 if (ptrace (PT_CONTINUE, pid, (caddr_t) 1, 0) == -1)
1358 perror_with_name (("ptrace"));
1363 /* Switch to an LWP PTID on the first stop in a new process.
1364 This is done after handling PL_FLAG_EXITED to avoid
1365 switching to an exited LWP. It is done before checking
1366 PL_FLAG_BORN in case the first stop reported after
1367 attaching to an existing process is a PL_FLAG_BORN
1369 if (in_thread_list (ptid_t (pid)))
1372 fprintf_unfiltered (gdb_stdlog,
1373 "FLWP: using LWP %u for first thread\n",
1375 thread_change_ptid (ptid_t (pid), wptid);
1378 #ifdef PT_LWP_EVENTS
1379 if (pl.pl_flags & PL_FLAG_BORN)
1381 /* If GDB attaches to a multi-threaded process, newborn
1382 threads might be added by fbsd_add_threads that have
1383 not yet reported their PL_FLAG_BORN event. Ignore
1384 BORN events for an already-known LWP. */
1385 if (!in_thread_list (wptid))
1388 fprintf_unfiltered (gdb_stdlog,
1389 "FLWP: adding thread for LWP %u\n",
1393 ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
1399 if (pl.pl_flags & PL_FLAG_FORKED)
1401 #ifndef PTRACE_VFORK
1402 struct kinfo_proc kp;
1407 child = pl.pl_child_pid;
1408 ourstatus->kind = TARGET_WAITKIND_FORKED;
1410 if (pl.pl_flags & PL_FLAG_VFORKED)
1411 ourstatus->kind = TARGET_WAITKIND_VFORKED;
1414 /* Make sure the other end of the fork is stopped too. */
1415 child_ptid = fbsd_is_child_pending (child);
1416 if (child_ptid == null_ptid)
1418 pid = waitpid (child, &status, 0);
1420 perror_with_name (("waitpid"));
1422 gdb_assert (pid == child);
1424 if (ptrace (PT_LWPINFO, child, (caddr_t)&pl, sizeof pl) == -1)
1425 perror_with_name (("ptrace"));
1427 gdb_assert (pl.pl_flags & PL_FLAG_CHILD);
1428 child_ptid = ptid_t (child, pl.pl_lwpid, 0);
1431 /* Enable additional events on the child process. */
1432 fbsd_enable_proc_events (child_ptid.pid ());
1434 #ifndef PTRACE_VFORK
1435 /* For vfork, the child process will have the P_PPWAIT
1437 if (fbsd_fetch_kinfo_proc (child, &kp))
1439 if (kp.ki_flag & P_PPWAIT)
1440 ourstatus->kind = TARGET_WAITKIND_VFORKED;
1443 warning (_("Failed to fetch process information"));
1445 ourstatus->value.related_pid = child_ptid;
1450 if (pl.pl_flags & PL_FLAG_CHILD)
1452 /* Remember that this child forked, but do not report it
1453 until the parent reports its corresponding fork
1455 fbsd_remember_child (wptid);
1460 if (pl.pl_flags & PL_FLAG_VFORK_DONE)
1462 ourstatus->kind = TARGET_WAITKIND_VFORK_DONE;
1469 if (pl.pl_flags & PL_FLAG_EXEC)
1471 ourstatus->kind = TARGET_WAITKIND_EXECD;
1472 ourstatus->value.execd_pathname
1473 = xstrdup (pid_to_exec_file (pid));
1478 #ifdef USE_SIGTRAP_SIGINFO
1479 if (fbsd_handle_debug_trap (wptid, pl))
1483 /* Note that PL_FLAG_SCE is set for any event reported while
1484 a thread is executing a system call in the kernel. In
1485 particular, signals that interrupt a sleep in a system
1486 call will report this flag as part of their event. Stops
1487 explicitly for system call entry and exit always use
1488 SIGTRAP, so only treat SIGTRAP events as system call
1489 entry/exit events. */
1490 if (pl.pl_flags & (PL_FLAG_SCE | PL_FLAG_SCX)
1491 && ourstatus->value.sig == SIGTRAP)
1493 #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE
1494 if (catch_syscall_enabled ())
1496 if (catching_syscall_number (pl.pl_syscall_code))
1498 if (pl.pl_flags & PL_FLAG_SCE)
1499 ourstatus->kind = TARGET_WAITKIND_SYSCALL_ENTRY;
1501 ourstatus->kind = TARGET_WAITKIND_SYSCALL_RETURN;
1502 ourstatus->value.syscall_number = pl.pl_syscall_code;
1507 /* If the core isn't interested in this event, just
1508 continue the process explicitly and wait for another
1509 event. Note that PT_SYSCALL is "sticky" on FreeBSD
1510 and once system call stops are enabled on a process
1511 it stops for all system call entries and exits. */
1512 if (ptrace (PT_CONTINUE, pid, (caddr_t) 1, 0) == -1)
1513 perror_with_name (("ptrace"));
1521 #ifdef USE_SIGTRAP_SIGINFO
1522 /* Implement the "stopped_by_sw_breakpoint" target_ops method. */
1525 fbsd_nat_target::stopped_by_sw_breakpoint ()
1527 struct ptrace_lwpinfo pl;
1529 if (ptrace (PT_LWPINFO, get_ptrace_pid (inferior_ptid), (caddr_t) &pl,
1533 return (pl.pl_flags == PL_FLAG_SI
1534 && pl.pl_siginfo.si_signo == SIGTRAP
1535 && pl.pl_siginfo.si_code == TRAP_BRKPT);
1538 /* Implement the "supports_stopped_by_sw_breakpoint" target_ops
1542 fbsd_nat_target::supports_stopped_by_sw_breakpoint ()
1549 /* Target hook for follow_fork. On entry and at return inferior_ptid is
1550 the ptid of the followed inferior. */
1553 fbsd_nat_target::follow_fork (int follow_child, int detach_fork)
1555 if (!follow_child && detach_fork)
1557 struct thread_info *tp = inferior_thread ();
1558 pid_t child_pid = tp->pending_follow.value.related_pid.pid ();
1560 /* Breakpoints have already been detached from the child by
1563 if (ptrace (PT_DETACH, child_pid, (PTRACE_TYPE_ARG3)1, 0) == -1)
1564 perror_with_name (("ptrace"));
1566 #ifndef PTRACE_VFORK
1567 if (tp->pending_follow.kind == TARGET_WAITKIND_VFORKED)
1569 /* We can't insert breakpoints until the child process has
1570 finished with the shared memory region. The parent
1571 process doesn't wait for the child process to exit or
1572 exec until after it has been resumed from the ptrace stop
1573 to report the fork. Once it has been resumed it doesn't
1574 stop again before returning to userland, so there is no
1575 reliable way to wait on the parent.
1577 We can't stay attached to the child to wait for an exec
1578 or exit because it may invoke ptrace(PT_TRACE_ME)
1579 (e.g. if the parent process is a debugger forking a new
1582 In the end, the best we can do is to make sure it runs
1583 for a little while. Hopefully it will be out of range of
1584 any breakpoints we reinsert. Usually this is only the
1585 single-step breakpoint at vfork's return point. */
1589 /* Schedule a fake VFORK_DONE event to report on the next
1591 fbsd_add_vfork_done (inferior_ptid);
1600 fbsd_nat_target::insert_fork_catchpoint (int pid)
1606 fbsd_nat_target::remove_fork_catchpoint (int pid)
1612 fbsd_nat_target::insert_vfork_catchpoint (int pid)
1618 fbsd_nat_target::remove_vfork_catchpoint (int pid)
1624 /* Implement the "post_startup_inferior" target_ops method. */
1627 fbsd_nat_target::post_startup_inferior (ptid_t pid)
1629 fbsd_enable_proc_events (pid.pid ());
1632 /* Implement the "post_attach" target_ops method. */
1635 fbsd_nat_target::post_attach (int pid)
1637 fbsd_enable_proc_events (pid);
1638 fbsd_add_threads (pid);
1642 /* If the FreeBSD kernel supports PL_FLAG_EXEC, then traced processes
1643 will always stop after exec. */
1646 fbsd_nat_target::insert_exec_catchpoint (int pid)
1652 fbsd_nat_target::remove_exec_catchpoint (int pid)
1658 #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE
1660 fbsd_nat_target::set_syscall_catchpoint (int pid, bool needed,
1662 gdb::array_view<const int> syscall_counts)
1665 /* Ignore the arguments. inf-ptrace.c will use PT_SYSCALL which
1666 will catch all system call entries and exits. The system calls
1667 are filtered by GDB rather than the kernel. */
1674 _initialize_fbsd_nat (void)
1677 add_setshow_boolean_cmd ("fbsd-lwp", class_maintenance,
1678 &debug_fbsd_lwp, _("\
1679 Set debugging of FreeBSD lwp module."), _("\
1680 Show debugging of FreeBSD lwp module."), _("\
1681 Enables printf debugging output."),
1683 &show_fbsd_lwp_debug,
1684 &setdebuglist, &showdebuglist);
1685 add_setshow_boolean_cmd ("fbsd-nat", class_maintenance,
1686 &debug_fbsd_nat, _("\
1687 Set debugging of FreeBSD native target."), _("\
1688 Show debugging of FreeBSD native target."), _("\
1689 Enables printf debugging output."),
1691 &show_fbsd_nat_debug,
1692 &setdebuglist, &showdebuglist);