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578c1c03 MK |
1 | /* Native-dependent code for FreeBSD. |
2 | ||
618f726f | 3 | Copyright (C) 2002-2016 Free Software Foundation, Inc. |
578c1c03 MK |
4 | |
5 | This file is part of GDB. | |
6 | ||
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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
578c1c03 MK |
10 | (at your option) any later version. |
11 | ||
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. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
578c1c03 MK |
19 | |
20 | #include "defs.h" | |
21 | #include "gdbcore.h" | |
22 | #include "inferior.h" | |
23 | #include "regcache.h" | |
24 | #include "regset.h" | |
6e9567fe | 25 | #include "gdbcmd.h" |
2020b7ab | 26 | #include "gdbthread.h" |
cea6e4f1 | 27 | #include "gdb_wait.h" |
578c1c03 | 28 | #include <sys/types.h> |
68b9939a | 29 | #include <sys/procfs.h> |
e58e05d6 | 30 | #include <sys/ptrace.h> |
68b9939a | 31 | #include <sys/sysctl.h> |
25268153 JB |
32 | #ifdef HAVE_KINFO_GETVMMAP |
33 | #include <sys/user.h> | |
34 | #include <libutil.h> | |
35 | #endif | |
578c1c03 MK |
36 | |
37 | #include "elf-bfd.h" | |
38 | #include "fbsd-nat.h" | |
39 | ||
766062f6 | 40 | /* Return the name of a file that can be opened to get the symbols for |
578c1c03 MK |
41 | the child process identified by PID. */ |
42 | ||
8f60fe01 | 43 | static char * |
8dd27370 | 44 | fbsd_pid_to_exec_file (struct target_ops *self, int pid) |
578c1c03 | 45 | { |
b4ab256d HZ |
46 | ssize_t len = PATH_MAX; |
47 | static char buf[PATH_MAX]; | |
48 | char name[PATH_MAX]; | |
578c1c03 | 49 | |
68b9939a MK |
50 | #ifdef KERN_PROC_PATHNAME |
51 | int mib[4]; | |
578c1c03 | 52 | |
68b9939a MK |
53 | mib[0] = CTL_KERN; |
54 | mib[1] = KERN_PROC; | |
55 | mib[2] = KERN_PROC_PATHNAME; | |
56 | mib[3] = pid; | |
57 | if (sysctl (mib, 4, buf, &len, NULL, 0) == 0) | |
578c1c03 | 58 | return buf; |
68b9939a | 59 | #endif |
578c1c03 | 60 | |
b4ab256d HZ |
61 | xsnprintf (name, PATH_MAX, "/proc/%d/exe", pid); |
62 | len = readlink (name, buf, PATH_MAX - 1); | |
63 | if (len != -1) | |
68b9939a | 64 | { |
b4ab256d HZ |
65 | buf[len] = '\0'; |
66 | return buf; | |
68b9939a MK |
67 | } |
68 | ||
b4ab256d | 69 | return NULL; |
578c1c03 MK |
70 | } |
71 | ||
25268153 JB |
72 | #ifdef HAVE_KINFO_GETVMMAP |
73 | /* Iterate over all the memory regions in the current inferior, | |
74 | calling FUNC for each memory region. OBFD is passed as the last | |
75 | argument to FUNC. */ | |
76 | ||
8f60fe01 | 77 | static int |
25268153 JB |
78 | fbsd_find_memory_regions (struct target_ops *self, |
79 | find_memory_region_ftype func, void *obfd) | |
80 | { | |
81 | pid_t pid = ptid_get_pid (inferior_ptid); | |
82 | struct kinfo_vmentry *vmentl, *kve; | |
83 | uint64_t size; | |
84 | struct cleanup *cleanup; | |
85 | int i, nitems; | |
86 | ||
87 | vmentl = kinfo_getvmmap (pid, &nitems); | |
88 | if (vmentl == NULL) | |
89 | perror_with_name (_("Couldn't fetch VM map entries.")); | |
90 | cleanup = make_cleanup (free, vmentl); | |
91 | ||
92 | for (i = 0; i < nitems; i++) | |
93 | { | |
94 | kve = &vmentl[i]; | |
95 | ||
96 | /* Skip unreadable segments and those where MAP_NOCORE has been set. */ | |
97 | if (!(kve->kve_protection & KVME_PROT_READ) | |
98 | || kve->kve_flags & KVME_FLAG_NOCOREDUMP) | |
99 | continue; | |
100 | ||
101 | /* Skip segments with an invalid type. */ | |
102 | if (kve->kve_type != KVME_TYPE_DEFAULT | |
103 | && kve->kve_type != KVME_TYPE_VNODE | |
104 | && kve->kve_type != KVME_TYPE_SWAP | |
105 | && kve->kve_type != KVME_TYPE_PHYS) | |
106 | continue; | |
107 | ||
108 | size = kve->kve_end - kve->kve_start; | |
109 | if (info_verbose) | |
110 | { | |
111 | fprintf_filtered (gdb_stdout, | |
112 | "Save segment, %ld bytes at %s (%c%c%c)\n", | |
113 | (long) size, | |
114 | paddress (target_gdbarch (), kve->kve_start), | |
115 | kve->kve_protection & KVME_PROT_READ ? 'r' : '-', | |
116 | kve->kve_protection & KVME_PROT_WRITE ? 'w' : '-', | |
117 | kve->kve_protection & KVME_PROT_EXEC ? 'x' : '-'); | |
118 | } | |
119 | ||
120 | /* Invoke the callback function to create the corefile segment. | |
121 | Pass MODIFIED as true, we do not know the real modification state. */ | |
122 | func (kve->kve_start, size, kve->kve_protection & KVME_PROT_READ, | |
123 | kve->kve_protection & KVME_PROT_WRITE, | |
124 | kve->kve_protection & KVME_PROT_EXEC, 1, obfd); | |
125 | } | |
126 | do_cleanups (cleanup); | |
127 | return 0; | |
128 | } | |
129 | #else | |
578c1c03 MK |
130 | static int |
131 | fbsd_read_mapping (FILE *mapfile, unsigned long *start, unsigned long *end, | |
132 | char *protection) | |
133 | { | |
134 | /* FreeBSD 5.1-RELEASE uses a 256-byte buffer. */ | |
135 | char buf[256]; | |
136 | int resident, privateresident; | |
137 | unsigned long obj; | |
138 | int ret = EOF; | |
139 | ||
140 | /* As of FreeBSD 5.0-RELEASE, the layout is described in | |
141 | /usr/src/sys/fs/procfs/procfs_map.c. Somewhere in 5.1-CURRENT a | |
142 | new column was added to the procfs map. Therefore we can't use | |
143 | fscanf since we need to support older releases too. */ | |
144 | if (fgets (buf, sizeof buf, mapfile) != NULL) | |
145 | ret = sscanf (buf, "%lx %lx %d %d %lx %s", start, end, | |
146 | &resident, &privateresident, &obj, protection); | |
147 | ||
148 | return (ret != 0 && ret != EOF); | |
149 | } | |
150 | ||
151 | /* Iterate over all the memory regions in the current inferior, | |
152 | calling FUNC for each memory region. OBFD is passed as the last | |
153 | argument to FUNC. */ | |
154 | ||
8f60fe01 | 155 | static int |
2e73927c TT |
156 | fbsd_find_memory_regions (struct target_ops *self, |
157 | find_memory_region_ftype func, void *obfd) | |
578c1c03 MK |
158 | { |
159 | pid_t pid = ptid_get_pid (inferior_ptid); | |
160 | char *mapfilename; | |
161 | FILE *mapfile; | |
162 | unsigned long start, end, size; | |
163 | char protection[4]; | |
164 | int read, write, exec; | |
7c8a8b04 | 165 | struct cleanup *cleanup; |
578c1c03 MK |
166 | |
167 | mapfilename = xstrprintf ("/proc/%ld/map", (long) pid); | |
7c8a8b04 | 168 | cleanup = make_cleanup (xfree, mapfilename); |
578c1c03 MK |
169 | mapfile = fopen (mapfilename, "r"); |
170 | if (mapfile == NULL) | |
8a3fe4f8 | 171 | error (_("Couldn't open %s."), mapfilename); |
7c8a8b04 | 172 | make_cleanup_fclose (mapfile); |
578c1c03 MK |
173 | |
174 | if (info_verbose) | |
175 | fprintf_filtered (gdb_stdout, | |
176 | "Reading memory regions from %s\n", mapfilename); | |
177 | ||
178 | /* Now iterate until end-of-file. */ | |
179 | while (fbsd_read_mapping (mapfile, &start, &end, &protection[0])) | |
180 | { | |
181 | size = end - start; | |
182 | ||
183 | read = (strchr (protection, 'r') != 0); | |
184 | write = (strchr (protection, 'w') != 0); | |
185 | exec = (strchr (protection, 'x') != 0); | |
186 | ||
187 | if (info_verbose) | |
188 | { | |
189 | fprintf_filtered (gdb_stdout, | |
5af949e3 | 190 | "Save segment, %ld bytes at %s (%c%c%c)\n", |
f5656ead | 191 | size, paddress (target_gdbarch (), start), |
578c1c03 MK |
192 | read ? 'r' : '-', |
193 | write ? 'w' : '-', | |
194 | exec ? 'x' : '-'); | |
195 | } | |
196 | ||
4f69f4c2 JK |
197 | /* Invoke the callback function to create the corefile segment. |
198 | Pass MODIFIED as true, we do not know the real modification state. */ | |
199 | func (start, size, read, write, exec, 1, obfd); | |
578c1c03 MK |
200 | } |
201 | ||
7c8a8b04 | 202 | do_cleanups (cleanup); |
578c1c03 MK |
203 | return 0; |
204 | } | |
25268153 | 205 | #endif |
8f60fe01 | 206 | |
e58e05d6 | 207 | #ifdef PT_LWPINFO |
6e9567fe JB |
208 | static int debug_fbsd_lwp; |
209 | ||
e58e05d6 JB |
210 | static ptid_t (*super_wait) (struct target_ops *, |
211 | ptid_t, | |
212 | struct target_waitstatus *, | |
213 | int); | |
214 | ||
6e9567fe JB |
215 | static void |
216 | show_fbsd_lwp_debug (struct ui_file *file, int from_tty, | |
217 | struct cmd_list_element *c, const char *value) | |
218 | { | |
219 | fprintf_filtered (file, _("Debugging of FreeBSD lwp module is %s.\n"), value); | |
220 | } | |
221 | ||
222 | #if defined(TDP_RFPPWAIT) || defined(HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME) | |
223 | /* Fetch the external variant of the kernel's internal process | |
224 | structure for the process PID into KP. */ | |
225 | ||
226 | static void | |
227 | fbsd_fetch_kinfo_proc (pid_t pid, struct kinfo_proc *kp) | |
228 | { | |
229 | size_t len; | |
230 | int mib[4]; | |
231 | ||
232 | len = sizeof *kp; | |
233 | mib[0] = CTL_KERN; | |
234 | mib[1] = KERN_PROC; | |
235 | mib[2] = KERN_PROC_PID; | |
236 | mib[3] = pid; | |
237 | if (sysctl (mib, 4, kp, &len, NULL, 0) == -1) | |
238 | perror_with_name (("sysctl")); | |
239 | } | |
240 | #endif | |
241 | ||
242 | /* | |
243 | FreeBSD's first thread support was via a "reentrant" version of libc | |
244 | (libc_r) that first shipped in 2.2.7. This library multiplexed all | |
245 | of the threads in a process onto a single kernel thread. This | |
246 | library is supported via the bsd-uthread target. | |
247 | ||
248 | FreeBSD 5.1 introduced two new threading libraries that made use of | |
249 | multiple kernel threads. The first (libkse) scheduled M user | |
250 | threads onto N (<= M) kernel threads (LWPs). The second (libthr) | |
251 | bound each user thread to a dedicated kernel thread. libkse shipped | |
252 | as the default threading library (libpthread). | |
253 | ||
254 | FreeBSD 5.3 added a libthread_db to abstract the interface across | |
255 | the various thread libraries (libc_r, libkse, and libthr). | |
256 | ||
257 | FreeBSD 7.0 switched the default threading library from from libkse | |
258 | to libpthread and removed libc_r. | |
259 | ||
260 | FreeBSD 8.0 removed libkse and the in-kernel support for it. The | |
261 | only threading library supported by 8.0 and later is libthr which | |
262 | ties each user thread directly to an LWP. To simplify the | |
263 | implementation, this target only supports LWP-backed threads using | |
264 | ptrace directly rather than libthread_db. | |
265 | ||
266 | FreeBSD 11.0 introduced LWP event reporting via PT_LWP_EVENTS. | |
267 | */ | |
268 | ||
269 | /* Return true if PTID is still active in the inferior. */ | |
270 | ||
271 | static int | |
272 | fbsd_thread_alive (struct target_ops *ops, ptid_t ptid) | |
273 | { | |
274 | if (ptid_lwp_p (ptid)) | |
275 | { | |
276 | struct ptrace_lwpinfo pl; | |
277 | ||
278 | if (ptrace (PT_LWPINFO, ptid_get_lwp (ptid), (caddr_t) &pl, sizeof pl) | |
279 | == -1) | |
280 | return 0; | |
281 | #ifdef PL_FLAG_EXITED | |
282 | if (pl.pl_flags & PL_FLAG_EXITED) | |
283 | return 0; | |
284 | #endif | |
285 | } | |
286 | ||
287 | return 1; | |
288 | } | |
289 | ||
290 | /* Convert PTID to a string. Returns the string in a static | |
291 | buffer. */ | |
292 | ||
293 | static char * | |
294 | fbsd_pid_to_str (struct target_ops *ops, ptid_t ptid) | |
295 | { | |
296 | lwpid_t lwp; | |
297 | ||
298 | lwp = ptid_get_lwp (ptid); | |
299 | if (lwp != 0) | |
300 | { | |
301 | static char buf[64]; | |
302 | int pid = ptid_get_pid (ptid); | |
303 | ||
304 | xsnprintf (buf, sizeof buf, "process %d, LWP %d", pid, lwp); | |
305 | return buf; | |
306 | } | |
307 | ||
308 | return normal_pid_to_str (ptid); | |
309 | } | |
310 | ||
311 | #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME | |
312 | /* Return the name assigned to a thread by an application. Returns | |
313 | the string in a static buffer. */ | |
314 | ||
315 | static const char * | |
316 | fbsd_thread_name (struct target_ops *self, struct thread_info *thr) | |
317 | { | |
318 | struct ptrace_lwpinfo pl; | |
319 | struct kinfo_proc kp; | |
320 | int pid = ptid_get_pid (thr->ptid); | |
321 | long lwp = ptid_get_lwp (thr->ptid); | |
322 | static char buf[sizeof pl.pl_tdname + 1]; | |
323 | ||
324 | /* Note that ptrace_lwpinfo returns the process command in pl_tdname | |
325 | if a name has not been set explicitly. Return a NULL name in | |
326 | that case. */ | |
327 | fbsd_fetch_kinfo_proc (pid, &kp); | |
328 | if (ptrace (PT_LWPINFO, lwp, (caddr_t) &pl, sizeof pl) == -1) | |
329 | perror_with_name (("ptrace")); | |
330 | if (strcmp (kp.ki_comm, pl.pl_tdname) == 0) | |
331 | return NULL; | |
332 | xsnprintf (buf, sizeof buf, "%s", pl.pl_tdname); | |
333 | return buf; | |
334 | } | |
335 | #endif | |
336 | ||
337 | #ifdef PT_LWP_EVENTS | |
338 | /* Enable LWP events for a specific process. | |
339 | ||
340 | To catch LWP events, PT_LWP_EVENTS is set on every traced process. | |
341 | This enables stops on the birth for new LWPs (excluding the "main" LWP) | |
342 | and the death of LWPs (excluding the last LWP in a process). Note | |
343 | that unlike fork events, the LWP that creates a new LWP does not | |
344 | report an event. */ | |
345 | ||
346 | static void | |
347 | fbsd_enable_lwp_events (pid_t pid) | |
348 | { | |
349 | if (ptrace (PT_LWP_EVENTS, pid, (PTRACE_TYPE_ARG3)0, 1) == -1) | |
350 | perror_with_name (("ptrace")); | |
351 | } | |
352 | #endif | |
353 | ||
354 | /* Add threads for any new LWPs in a process. | |
355 | ||
356 | When LWP events are used, this function is only used to detect existing | |
357 | threads when attaching to a process. On older systems, this function is | |
358 | called to discover new threads each time the thread list is updated. */ | |
359 | ||
360 | static void | |
361 | fbsd_add_threads (pid_t pid) | |
362 | { | |
363 | struct cleanup *cleanup; | |
364 | lwpid_t *lwps; | |
365 | int i, nlwps; | |
366 | ||
367 | gdb_assert (!in_thread_list (pid_to_ptid (pid))); | |
368 | nlwps = ptrace (PT_GETNUMLWPS, pid, NULL, 0); | |
369 | if (nlwps == -1) | |
370 | perror_with_name (("ptrace")); | |
371 | ||
372 | lwps = XCNEWVEC (lwpid_t, nlwps); | |
373 | cleanup = make_cleanup (xfree, lwps); | |
374 | ||
375 | nlwps = ptrace (PT_GETLWPLIST, pid, (caddr_t) lwps, nlwps); | |
376 | if (nlwps == -1) | |
377 | perror_with_name (("ptrace")); | |
378 | ||
379 | for (i = 0; i < nlwps; i++) | |
380 | { | |
381 | ptid_t ptid = ptid_build (pid, lwps[i], 0); | |
382 | ||
383 | if (!in_thread_list (ptid)) | |
384 | { | |
385 | #ifdef PT_LWP_EVENTS | |
386 | struct ptrace_lwpinfo pl; | |
387 | ||
388 | /* Don't add exited threads. Note that this is only called | |
389 | when attaching to a multi-threaded process. */ | |
390 | if (ptrace (PT_LWPINFO, lwps[i], (caddr_t) &pl, sizeof pl) == -1) | |
391 | perror_with_name (("ptrace")); | |
392 | if (pl.pl_flags & PL_FLAG_EXITED) | |
393 | continue; | |
394 | #endif | |
395 | if (debug_fbsd_lwp) | |
396 | fprintf_unfiltered (gdb_stdlog, | |
397 | "FLWP: adding thread for LWP %u\n", | |
398 | lwps[i]); | |
399 | add_thread (ptid); | |
400 | } | |
401 | } | |
402 | do_cleanups (cleanup); | |
403 | } | |
404 | ||
405 | /* Implement the "to_update_thread_list" target_ops method. */ | |
406 | ||
407 | static void | |
408 | fbsd_update_thread_list (struct target_ops *ops) | |
409 | { | |
410 | #ifdef PT_LWP_EVENTS | |
411 | /* With support for thread events, threads are added/deleted from the | |
412 | list as events are reported, so just try deleting exited threads. */ | |
413 | delete_exited_threads (); | |
414 | #else | |
415 | prune_threads (); | |
416 | ||
417 | fbsd_add_threads (ptid_get_pid (inferior_ptid)); | |
418 | #endif | |
419 | } | |
420 | ||
421 | static void (*super_resume) (struct target_ops *, | |
422 | ptid_t, | |
423 | int, | |
424 | enum gdb_signal); | |
425 | ||
426 | static int | |
427 | resume_one_thread_cb (struct thread_info *tp, void *data) | |
428 | { | |
429 | ptid_t *ptid = data; | |
430 | int request; | |
431 | ||
432 | if (ptid_get_pid (tp->ptid) != ptid_get_pid (*ptid)) | |
433 | return 0; | |
434 | ||
435 | if (ptid_get_lwp (tp->ptid) == ptid_get_lwp (*ptid)) | |
436 | request = PT_RESUME; | |
437 | else | |
438 | request = PT_SUSPEND; | |
439 | ||
440 | if (ptrace (request, ptid_get_lwp (tp->ptid), NULL, 0) == -1) | |
441 | perror_with_name (("ptrace")); | |
442 | return 0; | |
443 | } | |
444 | ||
445 | static int | |
446 | resume_all_threads_cb (struct thread_info *tp, void *data) | |
447 | { | |
448 | ptid_t *filter = data; | |
449 | ||
450 | if (!ptid_match (tp->ptid, *filter)) | |
451 | return 0; | |
452 | ||
453 | if (ptrace (PT_RESUME, ptid_get_lwp (tp->ptid), NULL, 0) == -1) | |
454 | perror_with_name (("ptrace")); | |
455 | return 0; | |
456 | } | |
457 | ||
458 | /* Implement the "to_resume" target_ops method. */ | |
459 | ||
460 | static void | |
461 | fbsd_resume (struct target_ops *ops, | |
462 | ptid_t ptid, int step, enum gdb_signal signo) | |
463 | { | |
464 | ||
465 | if (debug_fbsd_lwp) | |
466 | fprintf_unfiltered (gdb_stdlog, | |
467 | "FLWP: fbsd_resume for ptid (%d, %ld, %ld)\n", | |
468 | ptid_get_pid (ptid), ptid_get_lwp (ptid), | |
469 | ptid_get_tid (ptid)); | |
470 | if (ptid_lwp_p (ptid)) | |
471 | { | |
472 | /* If ptid is a specific LWP, suspend all other LWPs in the process. */ | |
473 | iterate_over_threads (resume_one_thread_cb, &ptid); | |
474 | } | |
475 | else | |
476 | { | |
477 | /* If ptid is a wildcard, resume all matching threads (they won't run | |
478 | until the process is continued however). */ | |
479 | iterate_over_threads (resume_all_threads_cb, &ptid); | |
480 | ptid = inferior_ptid; | |
481 | } | |
482 | super_resume (ops, ptid, step, signo); | |
483 | } | |
484 | ||
e58e05d6 JB |
485 | #ifdef TDP_RFPPWAIT |
486 | /* | |
487 | To catch fork events, PT_FOLLOW_FORK is set on every traced process | |
488 | to enable stops on returns from fork or vfork. Note that both the | |
489 | parent and child will always stop, even if system call stops are not | |
490 | enabled. | |
491 | ||
492 | After a fork, both the child and parent process will stop and report | |
493 | an event. However, there is no guarantee of order. If the parent | |
494 | reports its stop first, then fbsd_wait explicitly waits for the new | |
495 | child before returning. If the child reports its stop first, then | |
496 | the event is saved on a list and ignored until the parent's stop is | |
497 | reported. fbsd_wait could have been changed to fetch the parent PID | |
498 | of the new child and used that to wait for the parent explicitly. | |
499 | However, if two threads in the parent fork at the same time, then | |
500 | the wait on the parent might return the "wrong" fork event. | |
501 | ||
502 | The initial version of PT_FOLLOW_FORK did not set PL_FLAG_CHILD for | |
503 | the new child process. This flag could be inferred by treating any | |
504 | events for an unknown pid as a new child. | |
505 | ||
506 | In addition, the initial version of PT_FOLLOW_FORK did not report a | |
507 | stop event for the parent process of a vfork until after the child | |
508 | process executed a new program or exited. The kernel was changed to | |
509 | defer the wait for exit or exec of the child until after posting the | |
510 | stop event shortly after the change to introduce PL_FLAG_CHILD. | |
511 | This could be worked around by reporting a vfork event when the | |
512 | child event posted and ignoring the subsequent event from the | |
513 | parent. | |
514 | ||
515 | This implementation requires both of these fixes for simplicity's | |
516 | sake. FreeBSD versions newer than 9.1 contain both fixes. | |
517 | */ | |
518 | ||
519 | struct fbsd_fork_child_info | |
520 | { | |
521 | struct fbsd_fork_child_info *next; | |
6e9567fe | 522 | ptid_t child; /* Pid of new child. */ |
e58e05d6 JB |
523 | }; |
524 | ||
525 | static struct fbsd_fork_child_info *fbsd_pending_children; | |
526 | ||
527 | /* Record a new child process event that is reported before the | |
528 | corresponding fork event in the parent. */ | |
529 | ||
530 | static void | |
6e9567fe | 531 | fbsd_remember_child (ptid_t pid) |
e58e05d6 | 532 | { |
8d749320 | 533 | struct fbsd_fork_child_info *info = XCNEW (struct fbsd_fork_child_info); |
e58e05d6 JB |
534 | |
535 | info->child = pid; | |
536 | info->next = fbsd_pending_children; | |
537 | fbsd_pending_children = info; | |
538 | } | |
539 | ||
540 | /* Check for a previously-recorded new child process event for PID. | |
6e9567fe | 541 | If one is found, remove it from the list and return the PTID. */ |
e58e05d6 | 542 | |
6e9567fe | 543 | static ptid_t |
e58e05d6 JB |
544 | fbsd_is_child_pending (pid_t pid) |
545 | { | |
546 | struct fbsd_fork_child_info *info, *prev; | |
6e9567fe | 547 | ptid_t ptid; |
e58e05d6 JB |
548 | |
549 | prev = NULL; | |
550 | for (info = fbsd_pending_children; info; prev = info, info = info->next) | |
551 | { | |
6e9567fe | 552 | if (ptid_get_pid (info->child) == pid) |
e58e05d6 JB |
553 | { |
554 | if (prev == NULL) | |
555 | fbsd_pending_children = info->next; | |
556 | else | |
557 | prev->next = info->next; | |
6e9567fe | 558 | ptid = info->child; |
e58e05d6 | 559 | xfree (info); |
6e9567fe | 560 | return ptid; |
e58e05d6 JB |
561 | } |
562 | } | |
6e9567fe | 563 | return null_ptid; |
e58e05d6 JB |
564 | } |
565 | #endif | |
566 | ||
567 | /* Wait for the child specified by PTID to do something. Return the | |
568 | process ID of the child, or MINUS_ONE_PTID in case of error; store | |
569 | the status in *OURSTATUS. */ | |
570 | ||
571 | static ptid_t | |
572 | fbsd_wait (struct target_ops *ops, | |
573 | ptid_t ptid, struct target_waitstatus *ourstatus, | |
574 | int target_options) | |
575 | { | |
576 | ptid_t wptid; | |
577 | ||
578 | while (1) | |
579 | { | |
580 | wptid = super_wait (ops, ptid, ourstatus, target_options); | |
581 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED) | |
582 | { | |
583 | struct ptrace_lwpinfo pl; | |
584 | pid_t pid; | |
585 | int status; | |
586 | ||
587 | pid = ptid_get_pid (wptid); | |
6e9567fe | 588 | if (ptrace (PT_LWPINFO, pid, (caddr_t) &pl, sizeof pl) == -1) |
e58e05d6 JB |
589 | perror_with_name (("ptrace")); |
590 | ||
6e9567fe JB |
591 | wptid = ptid_build (pid, pl.pl_lwpid, 0); |
592 | ||
593 | #ifdef PT_LWP_EVENTS | |
594 | if (pl.pl_flags & PL_FLAG_EXITED) | |
595 | { | |
596 | /* If GDB attaches to a multi-threaded process, exiting | |
597 | threads might be skipped during fbsd_post_attach that | |
598 | have not yet reported their PL_FLAG_EXITED event. | |
599 | Ignore EXITED events for an unknown LWP. */ | |
600 | if (in_thread_list (wptid)) | |
601 | { | |
602 | if (debug_fbsd_lwp) | |
603 | fprintf_unfiltered (gdb_stdlog, | |
604 | "FLWP: deleting thread for LWP %u\n", | |
605 | pl.pl_lwpid); | |
606 | if (print_thread_events) | |
607 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str | |
608 | (wptid)); | |
609 | delete_thread (wptid); | |
610 | } | |
611 | if (ptrace (PT_CONTINUE, pid, (caddr_t) 1, 0) == -1) | |
612 | perror_with_name (("ptrace")); | |
613 | continue; | |
614 | } | |
615 | #endif | |
616 | ||
617 | /* Switch to an LWP PTID on the first stop in a new process. | |
618 | This is done after handling PL_FLAG_EXITED to avoid | |
619 | switching to an exited LWP. It is done before checking | |
620 | PL_FLAG_BORN in case the first stop reported after | |
621 | attaching to an existing process is a PL_FLAG_BORN | |
622 | event. */ | |
623 | if (in_thread_list (pid_to_ptid (pid))) | |
624 | { | |
625 | if (debug_fbsd_lwp) | |
626 | fprintf_unfiltered (gdb_stdlog, | |
627 | "FLWP: using LWP %u for first thread\n", | |
628 | pl.pl_lwpid); | |
629 | thread_change_ptid (pid_to_ptid (pid), wptid); | |
630 | } | |
631 | ||
632 | #ifdef PT_LWP_EVENTS | |
633 | if (pl.pl_flags & PL_FLAG_BORN) | |
634 | { | |
635 | /* If GDB attaches to a multi-threaded process, newborn | |
636 | threads might be added by fbsd_add_threads that have | |
637 | not yet reported their PL_FLAG_BORN event. Ignore | |
638 | BORN events for an already-known LWP. */ | |
639 | if (!in_thread_list (wptid)) | |
640 | { | |
641 | if (debug_fbsd_lwp) | |
642 | fprintf_unfiltered (gdb_stdlog, | |
643 | "FLWP: adding thread for LWP %u\n", | |
644 | pl.pl_lwpid); | |
645 | add_thread (wptid); | |
646 | } | |
647 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
648 | return wptid; | |
649 | } | |
650 | #endif | |
651 | ||
e58e05d6 JB |
652 | #ifdef TDP_RFPPWAIT |
653 | if (pl.pl_flags & PL_FLAG_FORKED) | |
654 | { | |
655 | struct kinfo_proc kp; | |
6e9567fe | 656 | ptid_t child_ptid; |
e58e05d6 JB |
657 | pid_t child; |
658 | ||
659 | child = pl.pl_child_pid; | |
660 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
e58e05d6 JB |
661 | |
662 | /* Make sure the other end of the fork is stopped too. */ | |
6e9567fe JB |
663 | child_ptid = fbsd_is_child_pending (child); |
664 | if (ptid_equal (child_ptid, null_ptid)) | |
e58e05d6 JB |
665 | { |
666 | pid = waitpid (child, &status, 0); | |
667 | if (pid == -1) | |
668 | perror_with_name (("waitpid")); | |
669 | ||
670 | gdb_assert (pid == child); | |
671 | ||
672 | if (ptrace (PT_LWPINFO, child, (caddr_t)&pl, sizeof pl) == -1) | |
673 | perror_with_name (("ptrace")); | |
674 | ||
675 | gdb_assert (pl.pl_flags & PL_FLAG_CHILD); | |
6e9567fe | 676 | child_ptid = ptid_build (child, pl.pl_lwpid, 0); |
e58e05d6 JB |
677 | } |
678 | ||
679 | /* For vfork, the child process will have the P_PPWAIT | |
680 | flag set. */ | |
681 | fbsd_fetch_kinfo_proc (child, &kp); | |
682 | if (kp.ki_flag & P_PPWAIT) | |
683 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
6e9567fe | 684 | ourstatus->value.related_pid = child_ptid; |
e58e05d6 JB |
685 | |
686 | return wptid; | |
687 | } | |
688 | ||
689 | if (pl.pl_flags & PL_FLAG_CHILD) | |
690 | { | |
691 | /* Remember that this child forked, but do not report it | |
692 | until the parent reports its corresponding fork | |
693 | event. */ | |
6e9567fe | 694 | fbsd_remember_child (wptid); |
e58e05d6 JB |
695 | continue; |
696 | } | |
697 | #endif | |
d2b41ca0 JB |
698 | |
699 | #ifdef PL_FLAG_EXEC | |
700 | if (pl.pl_flags & PL_FLAG_EXEC) | |
701 | { | |
702 | ourstatus->kind = TARGET_WAITKIND_EXECD; | |
703 | ourstatus->value.execd_pathname | |
704 | = xstrdup (fbsd_pid_to_exec_file (NULL, pid)); | |
705 | return wptid; | |
706 | } | |
707 | #endif | |
e58e05d6 JB |
708 | } |
709 | return wptid; | |
710 | } | |
711 | } | |
712 | ||
713 | #ifdef TDP_RFPPWAIT | |
714 | /* Target hook for follow_fork. On entry and at return inferior_ptid is | |
715 | the ptid of the followed inferior. */ | |
716 | ||
717 | static int | |
718 | fbsd_follow_fork (struct target_ops *ops, int follow_child, | |
719 | int detach_fork) | |
720 | { | |
721 | if (!follow_child) | |
722 | { | |
723 | struct thread_info *tp = inferior_thread (); | |
724 | pid_t child_pid = ptid_get_pid (tp->pending_follow.value.related_pid); | |
725 | ||
726 | /* Breakpoints have already been detached from the child by | |
727 | infrun.c. */ | |
728 | ||
729 | if (ptrace (PT_DETACH, child_pid, (PTRACE_TYPE_ARG3)1, 0) == -1) | |
730 | perror_with_name (("ptrace")); | |
731 | } | |
732 | ||
733 | return 0; | |
734 | } | |
735 | ||
736 | static int | |
737 | fbsd_insert_fork_catchpoint (struct target_ops *self, int pid) | |
738 | { | |
739 | return 0; | |
740 | } | |
741 | ||
742 | static int | |
743 | fbsd_remove_fork_catchpoint (struct target_ops *self, int pid) | |
744 | { | |
745 | return 0; | |
746 | } | |
747 | ||
748 | static int | |
749 | fbsd_insert_vfork_catchpoint (struct target_ops *self, int pid) | |
750 | { | |
751 | return 0; | |
752 | } | |
753 | ||
754 | static int | |
755 | fbsd_remove_vfork_catchpoint (struct target_ops *self, int pid) | |
756 | { | |
757 | return 0; | |
758 | } | |
759 | ||
760 | /* Enable fork tracing for a specific process. | |
761 | ||
762 | To catch fork events, PT_FOLLOW_FORK is set on every traced process | |
763 | to enable stops on returns from fork or vfork. Note that both the | |
764 | parent and child will always stop, even if system call stops are | |
765 | not enabled. */ | |
766 | ||
767 | static void | |
768 | fbsd_enable_follow_fork (pid_t pid) | |
769 | { | |
770 | if (ptrace (PT_FOLLOW_FORK, pid, (PTRACE_TYPE_ARG3)0, 1) == -1) | |
771 | perror_with_name (("ptrace")); | |
772 | } | |
6e9567fe | 773 | #endif |
e58e05d6 JB |
774 | |
775 | /* Implement the "to_post_startup_inferior" target_ops method. */ | |
776 | ||
777 | static void | |
778 | fbsd_post_startup_inferior (struct target_ops *self, ptid_t pid) | |
779 | { | |
6e9567fe | 780 | #ifdef TDP_RFPPWAIT |
e58e05d6 | 781 | fbsd_enable_follow_fork (ptid_get_pid (pid)); |
6e9567fe JB |
782 | #endif |
783 | #ifdef PT_LWP_EVENTS | |
784 | fbsd_enable_lwp_events (ptid_get_pid (pid)); | |
785 | #endif | |
e58e05d6 JB |
786 | } |
787 | ||
788 | /* Implement the "to_post_attach" target_ops method. */ | |
789 | ||
790 | static void | |
791 | fbsd_post_attach (struct target_ops *self, int pid) | |
792 | { | |
6e9567fe | 793 | #ifdef TDP_RFPPWAIT |
e58e05d6 | 794 | fbsd_enable_follow_fork (pid); |
e58e05d6 | 795 | #endif |
6e9567fe JB |
796 | #ifdef PT_LWP_EVENTS |
797 | fbsd_enable_lwp_events (pid); | |
798 | #endif | |
799 | fbsd_add_threads (pid); | |
800 | } | |
d2b41ca0 JB |
801 | |
802 | #ifdef PL_FLAG_EXEC | |
803 | /* If the FreeBSD kernel supports PL_FLAG_EXEC, then traced processes | |
804 | will always stop after exec. */ | |
805 | ||
806 | static int | |
807 | fbsd_insert_exec_catchpoint (struct target_ops *self, int pid) | |
808 | { | |
809 | return 0; | |
810 | } | |
811 | ||
812 | static int | |
813 | fbsd_remove_exec_catchpoint (struct target_ops *self, int pid) | |
814 | { | |
815 | return 0; | |
816 | } | |
817 | #endif | |
e58e05d6 JB |
818 | #endif |
819 | ||
8f60fe01 JB |
820 | void |
821 | fbsd_nat_add_target (struct target_ops *t) | |
822 | { | |
823 | t->to_pid_to_exec_file = fbsd_pid_to_exec_file; | |
824 | t->to_find_memory_regions = fbsd_find_memory_regions; | |
e58e05d6 | 825 | #ifdef PT_LWPINFO |
6e9567fe JB |
826 | t->to_thread_alive = fbsd_thread_alive; |
827 | t->to_pid_to_str = fbsd_pid_to_str; | |
828 | #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME | |
829 | t->to_thread_name = fbsd_thread_name; | |
830 | #endif | |
831 | t->to_update_thread_list = fbsd_update_thread_list; | |
832 | t->to_has_thread_control = tc_schedlock; | |
833 | super_resume = t->to_resume; | |
834 | t->to_resume = fbsd_resume; | |
e58e05d6 JB |
835 | super_wait = t->to_wait; |
836 | t->to_wait = fbsd_wait; | |
6e9567fe JB |
837 | t->to_post_startup_inferior = fbsd_post_startup_inferior; |
838 | t->to_post_attach = fbsd_post_attach; | |
e58e05d6 JB |
839 | #ifdef TDP_RFPPWAIT |
840 | t->to_follow_fork = fbsd_follow_fork; | |
841 | t->to_insert_fork_catchpoint = fbsd_insert_fork_catchpoint; | |
842 | t->to_remove_fork_catchpoint = fbsd_remove_fork_catchpoint; | |
843 | t->to_insert_vfork_catchpoint = fbsd_insert_vfork_catchpoint; | |
844 | t->to_remove_vfork_catchpoint = fbsd_remove_vfork_catchpoint; | |
e58e05d6 | 845 | #endif |
d2b41ca0 JB |
846 | #ifdef PL_FLAG_EXEC |
847 | t->to_insert_exec_catchpoint = fbsd_insert_exec_catchpoint; | |
848 | t->to_remove_exec_catchpoint = fbsd_remove_exec_catchpoint; | |
849 | #endif | |
e58e05d6 | 850 | #endif |
8f60fe01 JB |
851 | add_target (t); |
852 | } | |
6e9567fe JB |
853 | |
854 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
855 | extern initialize_file_ftype _initialize_fbsd_nat; | |
856 | ||
857 | void | |
858 | _initialize_fbsd_nat (void) | |
859 | { | |
860 | #ifdef PT_LWPINFO | |
861 | add_setshow_boolean_cmd ("fbsd-lwp", class_maintenance, | |
862 | &debug_fbsd_lwp, _("\ | |
863 | Set debugging of FreeBSD lwp module."), _("\ | |
864 | Show debugging of FreeBSD lwp module."), _("\ | |
865 | Enables printf debugging output."), | |
866 | NULL, | |
867 | &show_fbsd_lwp_debug, | |
868 | &setdebuglist, &showdebuglist); | |
869 | #endif | |
870 | } |