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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 | { |
f2feec98 | 46 | ssize_t len; |
b4ab256d HZ |
47 | static char buf[PATH_MAX]; |
48 | char name[PATH_MAX]; | |
578c1c03 | 49 | |
68b9939a | 50 | #ifdef KERN_PROC_PATHNAME |
f2feec98 | 51 | size_t buflen; |
68b9939a | 52 | int mib[4]; |
578c1c03 | 53 | |
68b9939a MK |
54 | mib[0] = CTL_KERN; |
55 | mib[1] = KERN_PROC; | |
56 | mib[2] = KERN_PROC_PATHNAME; | |
57 | mib[3] = pid; | |
f2feec98 JB |
58 | buflen = sizeof buf; |
59 | if (sysctl (mib, 4, buf, &buflen, NULL, 0) == 0) | |
578c1c03 | 60 | return buf; |
68b9939a | 61 | #endif |
578c1c03 | 62 | |
b4ab256d HZ |
63 | xsnprintf (name, PATH_MAX, "/proc/%d/exe", pid); |
64 | len = readlink (name, buf, PATH_MAX - 1); | |
65 | if (len != -1) | |
68b9939a | 66 | { |
b4ab256d HZ |
67 | buf[len] = '\0'; |
68 | return buf; | |
68b9939a MK |
69 | } |
70 | ||
b4ab256d | 71 | return NULL; |
578c1c03 MK |
72 | } |
73 | ||
25268153 JB |
74 | #ifdef HAVE_KINFO_GETVMMAP |
75 | /* Iterate over all the memory regions in the current inferior, | |
76 | calling FUNC for each memory region. OBFD is passed as the last | |
77 | argument to FUNC. */ | |
78 | ||
8f60fe01 | 79 | static int |
25268153 JB |
80 | fbsd_find_memory_regions (struct target_ops *self, |
81 | find_memory_region_ftype func, void *obfd) | |
82 | { | |
83 | pid_t pid = ptid_get_pid (inferior_ptid); | |
84 | struct kinfo_vmentry *vmentl, *kve; | |
85 | uint64_t size; | |
86 | struct cleanup *cleanup; | |
87 | int i, nitems; | |
88 | ||
89 | vmentl = kinfo_getvmmap (pid, &nitems); | |
90 | if (vmentl == NULL) | |
91 | perror_with_name (_("Couldn't fetch VM map entries.")); | |
92 | cleanup = make_cleanup (free, vmentl); | |
93 | ||
94 | for (i = 0; i < nitems; i++) | |
95 | { | |
96 | kve = &vmentl[i]; | |
97 | ||
98 | /* Skip unreadable segments and those where MAP_NOCORE has been set. */ | |
99 | if (!(kve->kve_protection & KVME_PROT_READ) | |
100 | || kve->kve_flags & KVME_FLAG_NOCOREDUMP) | |
101 | continue; | |
102 | ||
103 | /* Skip segments with an invalid type. */ | |
104 | if (kve->kve_type != KVME_TYPE_DEFAULT | |
105 | && kve->kve_type != KVME_TYPE_VNODE | |
106 | && kve->kve_type != KVME_TYPE_SWAP | |
107 | && kve->kve_type != KVME_TYPE_PHYS) | |
108 | continue; | |
109 | ||
110 | size = kve->kve_end - kve->kve_start; | |
111 | if (info_verbose) | |
112 | { | |
113 | fprintf_filtered (gdb_stdout, | |
114 | "Save segment, %ld bytes at %s (%c%c%c)\n", | |
115 | (long) size, | |
116 | paddress (target_gdbarch (), kve->kve_start), | |
117 | kve->kve_protection & KVME_PROT_READ ? 'r' : '-', | |
118 | kve->kve_protection & KVME_PROT_WRITE ? 'w' : '-', | |
119 | kve->kve_protection & KVME_PROT_EXEC ? 'x' : '-'); | |
120 | } | |
121 | ||
122 | /* Invoke the callback function to create the corefile segment. | |
123 | Pass MODIFIED as true, we do not know the real modification state. */ | |
124 | func (kve->kve_start, size, kve->kve_protection & KVME_PROT_READ, | |
125 | kve->kve_protection & KVME_PROT_WRITE, | |
126 | kve->kve_protection & KVME_PROT_EXEC, 1, obfd); | |
127 | } | |
128 | do_cleanups (cleanup); | |
129 | return 0; | |
130 | } | |
131 | #else | |
578c1c03 MK |
132 | static int |
133 | fbsd_read_mapping (FILE *mapfile, unsigned long *start, unsigned long *end, | |
134 | char *protection) | |
135 | { | |
136 | /* FreeBSD 5.1-RELEASE uses a 256-byte buffer. */ | |
137 | char buf[256]; | |
138 | int resident, privateresident; | |
139 | unsigned long obj; | |
140 | int ret = EOF; | |
141 | ||
142 | /* As of FreeBSD 5.0-RELEASE, the layout is described in | |
143 | /usr/src/sys/fs/procfs/procfs_map.c. Somewhere in 5.1-CURRENT a | |
144 | new column was added to the procfs map. Therefore we can't use | |
145 | fscanf since we need to support older releases too. */ | |
146 | if (fgets (buf, sizeof buf, mapfile) != NULL) | |
147 | ret = sscanf (buf, "%lx %lx %d %d %lx %s", start, end, | |
148 | &resident, &privateresident, &obj, protection); | |
149 | ||
150 | return (ret != 0 && ret != EOF); | |
151 | } | |
152 | ||
153 | /* Iterate over all the memory regions in the current inferior, | |
154 | calling FUNC for each memory region. OBFD is passed as the last | |
155 | argument to FUNC. */ | |
156 | ||
8f60fe01 | 157 | static int |
2e73927c TT |
158 | fbsd_find_memory_regions (struct target_ops *self, |
159 | find_memory_region_ftype func, void *obfd) | |
578c1c03 MK |
160 | { |
161 | pid_t pid = ptid_get_pid (inferior_ptid); | |
162 | char *mapfilename; | |
163 | FILE *mapfile; | |
164 | unsigned long start, end, size; | |
165 | char protection[4]; | |
166 | int read, write, exec; | |
7c8a8b04 | 167 | struct cleanup *cleanup; |
578c1c03 MK |
168 | |
169 | mapfilename = xstrprintf ("/proc/%ld/map", (long) pid); | |
7c8a8b04 | 170 | cleanup = make_cleanup (xfree, mapfilename); |
578c1c03 MK |
171 | mapfile = fopen (mapfilename, "r"); |
172 | if (mapfile == NULL) | |
8a3fe4f8 | 173 | error (_("Couldn't open %s."), mapfilename); |
7c8a8b04 | 174 | make_cleanup_fclose (mapfile); |
578c1c03 MK |
175 | |
176 | if (info_verbose) | |
177 | fprintf_filtered (gdb_stdout, | |
178 | "Reading memory regions from %s\n", mapfilename); | |
179 | ||
180 | /* Now iterate until end-of-file. */ | |
181 | while (fbsd_read_mapping (mapfile, &start, &end, &protection[0])) | |
182 | { | |
183 | size = end - start; | |
184 | ||
185 | read = (strchr (protection, 'r') != 0); | |
186 | write = (strchr (protection, 'w') != 0); | |
187 | exec = (strchr (protection, 'x') != 0); | |
188 | ||
189 | if (info_verbose) | |
190 | { | |
191 | fprintf_filtered (gdb_stdout, | |
5af949e3 | 192 | "Save segment, %ld bytes at %s (%c%c%c)\n", |
f5656ead | 193 | size, paddress (target_gdbarch (), start), |
578c1c03 MK |
194 | read ? 'r' : '-', |
195 | write ? 'w' : '-', | |
196 | exec ? 'x' : '-'); | |
197 | } | |
198 | ||
4f69f4c2 JK |
199 | /* Invoke the callback function to create the corefile segment. |
200 | Pass MODIFIED as true, we do not know the real modification state. */ | |
201 | func (start, size, read, write, exec, 1, obfd); | |
578c1c03 MK |
202 | } |
203 | ||
7c8a8b04 | 204 | do_cleanups (cleanup); |
578c1c03 MK |
205 | return 0; |
206 | } | |
25268153 | 207 | #endif |
8f60fe01 | 208 | |
e58e05d6 | 209 | #ifdef PT_LWPINFO |
6e9567fe JB |
210 | static int debug_fbsd_lwp; |
211 | ||
e58e05d6 JB |
212 | static ptid_t (*super_wait) (struct target_ops *, |
213 | ptid_t, | |
214 | struct target_waitstatus *, | |
215 | int); | |
216 | ||
6e9567fe JB |
217 | static void |
218 | show_fbsd_lwp_debug (struct ui_file *file, int from_tty, | |
219 | struct cmd_list_element *c, const char *value) | |
220 | { | |
221 | fprintf_filtered (file, _("Debugging of FreeBSD lwp module is %s.\n"), value); | |
222 | } | |
223 | ||
224 | #if defined(TDP_RFPPWAIT) || defined(HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME) | |
225 | /* Fetch the external variant of the kernel's internal process | |
226 | structure for the process PID into KP. */ | |
227 | ||
228 | static void | |
229 | fbsd_fetch_kinfo_proc (pid_t pid, struct kinfo_proc *kp) | |
230 | { | |
231 | size_t len; | |
232 | int mib[4]; | |
233 | ||
234 | len = sizeof *kp; | |
235 | mib[0] = CTL_KERN; | |
236 | mib[1] = KERN_PROC; | |
237 | mib[2] = KERN_PROC_PID; | |
238 | mib[3] = pid; | |
239 | if (sysctl (mib, 4, kp, &len, NULL, 0) == -1) | |
240 | perror_with_name (("sysctl")); | |
241 | } | |
242 | #endif | |
243 | ||
244 | /* | |
245 | FreeBSD's first thread support was via a "reentrant" version of libc | |
246 | (libc_r) that first shipped in 2.2.7. This library multiplexed all | |
247 | of the threads in a process onto a single kernel thread. This | |
248 | library is supported via the bsd-uthread target. | |
249 | ||
250 | FreeBSD 5.1 introduced two new threading libraries that made use of | |
251 | multiple kernel threads. The first (libkse) scheduled M user | |
252 | threads onto N (<= M) kernel threads (LWPs). The second (libthr) | |
253 | bound each user thread to a dedicated kernel thread. libkse shipped | |
254 | as the default threading library (libpthread). | |
255 | ||
256 | FreeBSD 5.3 added a libthread_db to abstract the interface across | |
257 | the various thread libraries (libc_r, libkse, and libthr). | |
258 | ||
259 | FreeBSD 7.0 switched the default threading library from from libkse | |
260 | to libpthread and removed libc_r. | |
261 | ||
262 | FreeBSD 8.0 removed libkse and the in-kernel support for it. The | |
263 | only threading library supported by 8.0 and later is libthr which | |
264 | ties each user thread directly to an LWP. To simplify the | |
265 | implementation, this target only supports LWP-backed threads using | |
266 | ptrace directly rather than libthread_db. | |
267 | ||
268 | FreeBSD 11.0 introduced LWP event reporting via PT_LWP_EVENTS. | |
269 | */ | |
270 | ||
271 | /* Return true if PTID is still active in the inferior. */ | |
272 | ||
273 | static int | |
274 | fbsd_thread_alive (struct target_ops *ops, ptid_t ptid) | |
275 | { | |
276 | if (ptid_lwp_p (ptid)) | |
277 | { | |
278 | struct ptrace_lwpinfo pl; | |
279 | ||
280 | if (ptrace (PT_LWPINFO, ptid_get_lwp (ptid), (caddr_t) &pl, sizeof pl) | |
281 | == -1) | |
282 | return 0; | |
283 | #ifdef PL_FLAG_EXITED | |
284 | if (pl.pl_flags & PL_FLAG_EXITED) | |
285 | return 0; | |
286 | #endif | |
287 | } | |
288 | ||
289 | return 1; | |
290 | } | |
291 | ||
292 | /* Convert PTID to a string. Returns the string in a static | |
293 | buffer. */ | |
294 | ||
295 | static char * | |
296 | fbsd_pid_to_str (struct target_ops *ops, ptid_t ptid) | |
297 | { | |
298 | lwpid_t lwp; | |
299 | ||
300 | lwp = ptid_get_lwp (ptid); | |
301 | if (lwp != 0) | |
302 | { | |
303 | static char buf[64]; | |
304 | int pid = ptid_get_pid (ptid); | |
305 | ||
b2bae2f7 | 306 | xsnprintf (buf, sizeof buf, "LWP %d of process %d", lwp, pid); |
6e9567fe JB |
307 | return buf; |
308 | } | |
309 | ||
310 | return normal_pid_to_str (ptid); | |
311 | } | |
312 | ||
313 | #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME | |
314 | /* Return the name assigned to a thread by an application. Returns | |
315 | the string in a static buffer. */ | |
316 | ||
317 | static const char * | |
318 | fbsd_thread_name (struct target_ops *self, struct thread_info *thr) | |
319 | { | |
320 | struct ptrace_lwpinfo pl; | |
321 | struct kinfo_proc kp; | |
322 | int pid = ptid_get_pid (thr->ptid); | |
323 | long lwp = ptid_get_lwp (thr->ptid); | |
324 | static char buf[sizeof pl.pl_tdname + 1]; | |
325 | ||
326 | /* Note that ptrace_lwpinfo returns the process command in pl_tdname | |
327 | if a name has not been set explicitly. Return a NULL name in | |
328 | that case. */ | |
329 | fbsd_fetch_kinfo_proc (pid, &kp); | |
330 | if (ptrace (PT_LWPINFO, lwp, (caddr_t) &pl, sizeof pl) == -1) | |
331 | perror_with_name (("ptrace")); | |
332 | if (strcmp (kp.ki_comm, pl.pl_tdname) == 0) | |
333 | return NULL; | |
334 | xsnprintf (buf, sizeof buf, "%s", pl.pl_tdname); | |
335 | return buf; | |
336 | } | |
337 | #endif | |
338 | ||
339 | #ifdef PT_LWP_EVENTS | |
340 | /* Enable LWP events for a specific process. | |
341 | ||
342 | To catch LWP events, PT_LWP_EVENTS is set on every traced process. | |
343 | This enables stops on the birth for new LWPs (excluding the "main" LWP) | |
344 | and the death of LWPs (excluding the last LWP in a process). Note | |
345 | that unlike fork events, the LWP that creates a new LWP does not | |
346 | report an event. */ | |
347 | ||
348 | static void | |
349 | fbsd_enable_lwp_events (pid_t pid) | |
350 | { | |
351 | if (ptrace (PT_LWP_EVENTS, pid, (PTRACE_TYPE_ARG3)0, 1) == -1) | |
352 | perror_with_name (("ptrace")); | |
353 | } | |
354 | #endif | |
355 | ||
356 | /* Add threads for any new LWPs in a process. | |
357 | ||
358 | When LWP events are used, this function is only used to detect existing | |
359 | threads when attaching to a process. On older systems, this function is | |
360 | called to discover new threads each time the thread list is updated. */ | |
361 | ||
362 | static void | |
363 | fbsd_add_threads (pid_t pid) | |
364 | { | |
365 | struct cleanup *cleanup; | |
366 | lwpid_t *lwps; | |
367 | int i, nlwps; | |
368 | ||
369 | gdb_assert (!in_thread_list (pid_to_ptid (pid))); | |
370 | nlwps = ptrace (PT_GETNUMLWPS, pid, NULL, 0); | |
371 | if (nlwps == -1) | |
372 | perror_with_name (("ptrace")); | |
373 | ||
374 | lwps = XCNEWVEC (lwpid_t, nlwps); | |
375 | cleanup = make_cleanup (xfree, lwps); | |
376 | ||
377 | nlwps = ptrace (PT_GETLWPLIST, pid, (caddr_t) lwps, nlwps); | |
378 | if (nlwps == -1) | |
379 | perror_with_name (("ptrace")); | |
380 | ||
381 | for (i = 0; i < nlwps; i++) | |
382 | { | |
383 | ptid_t ptid = ptid_build (pid, lwps[i], 0); | |
384 | ||
385 | if (!in_thread_list (ptid)) | |
386 | { | |
387 | #ifdef PT_LWP_EVENTS | |
388 | struct ptrace_lwpinfo pl; | |
389 | ||
390 | /* Don't add exited threads. Note that this is only called | |
391 | when attaching to a multi-threaded process. */ | |
392 | if (ptrace (PT_LWPINFO, lwps[i], (caddr_t) &pl, sizeof pl) == -1) | |
393 | perror_with_name (("ptrace")); | |
394 | if (pl.pl_flags & PL_FLAG_EXITED) | |
395 | continue; | |
396 | #endif | |
397 | if (debug_fbsd_lwp) | |
398 | fprintf_unfiltered (gdb_stdlog, | |
399 | "FLWP: adding thread for LWP %u\n", | |
400 | lwps[i]); | |
401 | add_thread (ptid); | |
402 | } | |
403 | } | |
404 | do_cleanups (cleanup); | |
405 | } | |
406 | ||
407 | /* Implement the "to_update_thread_list" target_ops method. */ | |
408 | ||
409 | static void | |
410 | fbsd_update_thread_list (struct target_ops *ops) | |
411 | { | |
412 | #ifdef PT_LWP_EVENTS | |
413 | /* With support for thread events, threads are added/deleted from the | |
414 | list as events are reported, so just try deleting exited threads. */ | |
415 | delete_exited_threads (); | |
416 | #else | |
417 | prune_threads (); | |
418 | ||
419 | fbsd_add_threads (ptid_get_pid (inferior_ptid)); | |
420 | #endif | |
421 | } | |
422 | ||
423 | static void (*super_resume) (struct target_ops *, | |
424 | ptid_t, | |
425 | int, | |
426 | enum gdb_signal); | |
427 | ||
428 | static int | |
429 | resume_one_thread_cb (struct thread_info *tp, void *data) | |
430 | { | |
431 | ptid_t *ptid = data; | |
432 | int request; | |
433 | ||
434 | if (ptid_get_pid (tp->ptid) != ptid_get_pid (*ptid)) | |
435 | return 0; | |
436 | ||
437 | if (ptid_get_lwp (tp->ptid) == ptid_get_lwp (*ptid)) | |
438 | request = PT_RESUME; | |
439 | else | |
440 | request = PT_SUSPEND; | |
441 | ||
442 | if (ptrace (request, ptid_get_lwp (tp->ptid), NULL, 0) == -1) | |
443 | perror_with_name (("ptrace")); | |
444 | return 0; | |
445 | } | |
446 | ||
447 | static int | |
448 | resume_all_threads_cb (struct thread_info *tp, void *data) | |
449 | { | |
450 | ptid_t *filter = data; | |
451 | ||
452 | if (!ptid_match (tp->ptid, *filter)) | |
453 | return 0; | |
454 | ||
455 | if (ptrace (PT_RESUME, ptid_get_lwp (tp->ptid), NULL, 0) == -1) | |
456 | perror_with_name (("ptrace")); | |
457 | return 0; | |
458 | } | |
459 | ||
460 | /* Implement the "to_resume" target_ops method. */ | |
461 | ||
462 | static void | |
463 | fbsd_resume (struct target_ops *ops, | |
464 | ptid_t ptid, int step, enum gdb_signal signo) | |
465 | { | |
466 | ||
467 | if (debug_fbsd_lwp) | |
468 | fprintf_unfiltered (gdb_stdlog, | |
469 | "FLWP: fbsd_resume for ptid (%d, %ld, %ld)\n", | |
470 | ptid_get_pid (ptid), ptid_get_lwp (ptid), | |
471 | ptid_get_tid (ptid)); | |
472 | if (ptid_lwp_p (ptid)) | |
473 | { | |
474 | /* If ptid is a specific LWP, suspend all other LWPs in the process. */ | |
475 | iterate_over_threads (resume_one_thread_cb, &ptid); | |
476 | } | |
477 | else | |
478 | { | |
479 | /* If ptid is a wildcard, resume all matching threads (they won't run | |
480 | until the process is continued however). */ | |
481 | iterate_over_threads (resume_all_threads_cb, &ptid); | |
482 | ptid = inferior_ptid; | |
483 | } | |
484 | super_resume (ops, ptid, step, signo); | |
485 | } | |
486 | ||
e58e05d6 JB |
487 | #ifdef TDP_RFPPWAIT |
488 | /* | |
489 | To catch fork events, PT_FOLLOW_FORK is set on every traced process | |
490 | to enable stops on returns from fork or vfork. Note that both the | |
491 | parent and child will always stop, even if system call stops are not | |
492 | enabled. | |
493 | ||
494 | After a fork, both the child and parent process will stop and report | |
495 | an event. However, there is no guarantee of order. If the parent | |
496 | reports its stop first, then fbsd_wait explicitly waits for the new | |
497 | child before returning. If the child reports its stop first, then | |
498 | the event is saved on a list and ignored until the parent's stop is | |
499 | reported. fbsd_wait could have been changed to fetch the parent PID | |
500 | of the new child and used that to wait for the parent explicitly. | |
501 | However, if two threads in the parent fork at the same time, then | |
502 | the wait on the parent might return the "wrong" fork event. | |
503 | ||
504 | The initial version of PT_FOLLOW_FORK did not set PL_FLAG_CHILD for | |
505 | the new child process. This flag could be inferred by treating any | |
506 | events for an unknown pid as a new child. | |
507 | ||
508 | In addition, the initial version of PT_FOLLOW_FORK did not report a | |
509 | stop event for the parent process of a vfork until after the child | |
510 | process executed a new program or exited. The kernel was changed to | |
511 | defer the wait for exit or exec of the child until after posting the | |
512 | stop event shortly after the change to introduce PL_FLAG_CHILD. | |
513 | This could be worked around by reporting a vfork event when the | |
514 | child event posted and ignoring the subsequent event from the | |
515 | parent. | |
516 | ||
517 | This implementation requires both of these fixes for simplicity's | |
518 | sake. FreeBSD versions newer than 9.1 contain both fixes. | |
519 | */ | |
520 | ||
521 | struct fbsd_fork_child_info | |
522 | { | |
523 | struct fbsd_fork_child_info *next; | |
6e9567fe | 524 | ptid_t child; /* Pid of new child. */ |
e58e05d6 JB |
525 | }; |
526 | ||
527 | static struct fbsd_fork_child_info *fbsd_pending_children; | |
528 | ||
529 | /* Record a new child process event that is reported before the | |
530 | corresponding fork event in the parent. */ | |
531 | ||
532 | static void | |
6e9567fe | 533 | fbsd_remember_child (ptid_t pid) |
e58e05d6 | 534 | { |
8d749320 | 535 | struct fbsd_fork_child_info *info = XCNEW (struct fbsd_fork_child_info); |
e58e05d6 JB |
536 | |
537 | info->child = pid; | |
538 | info->next = fbsd_pending_children; | |
539 | fbsd_pending_children = info; | |
540 | } | |
541 | ||
542 | /* Check for a previously-recorded new child process event for PID. | |
6e9567fe | 543 | If one is found, remove it from the list and return the PTID. */ |
e58e05d6 | 544 | |
6e9567fe | 545 | static ptid_t |
e58e05d6 JB |
546 | fbsd_is_child_pending (pid_t pid) |
547 | { | |
548 | struct fbsd_fork_child_info *info, *prev; | |
6e9567fe | 549 | ptid_t ptid; |
e58e05d6 JB |
550 | |
551 | prev = NULL; | |
552 | for (info = fbsd_pending_children; info; prev = info, info = info->next) | |
553 | { | |
6e9567fe | 554 | if (ptid_get_pid (info->child) == pid) |
e58e05d6 JB |
555 | { |
556 | if (prev == NULL) | |
557 | fbsd_pending_children = info->next; | |
558 | else | |
559 | prev->next = info->next; | |
6e9567fe | 560 | ptid = info->child; |
e58e05d6 | 561 | xfree (info); |
6e9567fe | 562 | return ptid; |
e58e05d6 JB |
563 | } |
564 | } | |
6e9567fe | 565 | return null_ptid; |
e58e05d6 JB |
566 | } |
567 | #endif | |
568 | ||
569 | /* Wait for the child specified by PTID to do something. Return the | |
570 | process ID of the child, or MINUS_ONE_PTID in case of error; store | |
571 | the status in *OURSTATUS. */ | |
572 | ||
573 | static ptid_t | |
574 | fbsd_wait (struct target_ops *ops, | |
575 | ptid_t ptid, struct target_waitstatus *ourstatus, | |
576 | int target_options) | |
577 | { | |
578 | ptid_t wptid; | |
579 | ||
580 | while (1) | |
581 | { | |
582 | wptid = super_wait (ops, ptid, ourstatus, target_options); | |
583 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED) | |
584 | { | |
585 | struct ptrace_lwpinfo pl; | |
586 | pid_t pid; | |
587 | int status; | |
588 | ||
589 | pid = ptid_get_pid (wptid); | |
6e9567fe | 590 | if (ptrace (PT_LWPINFO, pid, (caddr_t) &pl, sizeof pl) == -1) |
e58e05d6 JB |
591 | perror_with_name (("ptrace")); |
592 | ||
6e9567fe JB |
593 | wptid = ptid_build (pid, pl.pl_lwpid, 0); |
594 | ||
595 | #ifdef PT_LWP_EVENTS | |
596 | if (pl.pl_flags & PL_FLAG_EXITED) | |
597 | { | |
598 | /* If GDB attaches to a multi-threaded process, exiting | |
599 | threads might be skipped during fbsd_post_attach that | |
600 | have not yet reported their PL_FLAG_EXITED event. | |
601 | Ignore EXITED events for an unknown LWP. */ | |
602 | if (in_thread_list (wptid)) | |
603 | { | |
604 | if (debug_fbsd_lwp) | |
605 | fprintf_unfiltered (gdb_stdlog, | |
606 | "FLWP: deleting thread for LWP %u\n", | |
607 | pl.pl_lwpid); | |
608 | if (print_thread_events) | |
609 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str | |
610 | (wptid)); | |
611 | delete_thread (wptid); | |
612 | } | |
613 | if (ptrace (PT_CONTINUE, pid, (caddr_t) 1, 0) == -1) | |
614 | perror_with_name (("ptrace")); | |
615 | continue; | |
616 | } | |
617 | #endif | |
618 | ||
619 | /* Switch to an LWP PTID on the first stop in a new process. | |
620 | This is done after handling PL_FLAG_EXITED to avoid | |
621 | switching to an exited LWP. It is done before checking | |
622 | PL_FLAG_BORN in case the first stop reported after | |
623 | attaching to an existing process is a PL_FLAG_BORN | |
624 | event. */ | |
625 | if (in_thread_list (pid_to_ptid (pid))) | |
626 | { | |
627 | if (debug_fbsd_lwp) | |
628 | fprintf_unfiltered (gdb_stdlog, | |
629 | "FLWP: using LWP %u for first thread\n", | |
630 | pl.pl_lwpid); | |
631 | thread_change_ptid (pid_to_ptid (pid), wptid); | |
632 | } | |
633 | ||
634 | #ifdef PT_LWP_EVENTS | |
635 | if (pl.pl_flags & PL_FLAG_BORN) | |
636 | { | |
637 | /* If GDB attaches to a multi-threaded process, newborn | |
638 | threads might be added by fbsd_add_threads that have | |
639 | not yet reported their PL_FLAG_BORN event. Ignore | |
640 | BORN events for an already-known LWP. */ | |
641 | if (!in_thread_list (wptid)) | |
642 | { | |
643 | if (debug_fbsd_lwp) | |
644 | fprintf_unfiltered (gdb_stdlog, | |
645 | "FLWP: adding thread for LWP %u\n", | |
646 | pl.pl_lwpid); | |
647 | add_thread (wptid); | |
648 | } | |
649 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
650 | return wptid; | |
651 | } | |
652 | #endif | |
653 | ||
e58e05d6 JB |
654 | #ifdef TDP_RFPPWAIT |
655 | if (pl.pl_flags & PL_FLAG_FORKED) | |
656 | { | |
657 | struct kinfo_proc kp; | |
6e9567fe | 658 | ptid_t child_ptid; |
e58e05d6 JB |
659 | pid_t child; |
660 | ||
661 | child = pl.pl_child_pid; | |
662 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
e58e05d6 JB |
663 | |
664 | /* Make sure the other end of the fork is stopped too. */ | |
6e9567fe JB |
665 | child_ptid = fbsd_is_child_pending (child); |
666 | if (ptid_equal (child_ptid, null_ptid)) | |
e58e05d6 JB |
667 | { |
668 | pid = waitpid (child, &status, 0); | |
669 | if (pid == -1) | |
670 | perror_with_name (("waitpid")); | |
671 | ||
672 | gdb_assert (pid == child); | |
673 | ||
674 | if (ptrace (PT_LWPINFO, child, (caddr_t)&pl, sizeof pl) == -1) | |
675 | perror_with_name (("ptrace")); | |
676 | ||
677 | gdb_assert (pl.pl_flags & PL_FLAG_CHILD); | |
6e9567fe | 678 | child_ptid = ptid_build (child, pl.pl_lwpid, 0); |
e58e05d6 JB |
679 | } |
680 | ||
681 | /* For vfork, the child process will have the P_PPWAIT | |
682 | flag set. */ | |
683 | fbsd_fetch_kinfo_proc (child, &kp); | |
684 | if (kp.ki_flag & P_PPWAIT) | |
685 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
6e9567fe | 686 | ourstatus->value.related_pid = child_ptid; |
e58e05d6 JB |
687 | |
688 | return wptid; | |
689 | } | |
690 | ||
691 | if (pl.pl_flags & PL_FLAG_CHILD) | |
692 | { | |
693 | /* Remember that this child forked, but do not report it | |
694 | until the parent reports its corresponding fork | |
695 | event. */ | |
6e9567fe | 696 | fbsd_remember_child (wptid); |
e58e05d6 JB |
697 | continue; |
698 | } | |
699 | #endif | |
d2b41ca0 JB |
700 | |
701 | #ifdef PL_FLAG_EXEC | |
702 | if (pl.pl_flags & PL_FLAG_EXEC) | |
703 | { | |
704 | ourstatus->kind = TARGET_WAITKIND_EXECD; | |
705 | ourstatus->value.execd_pathname | |
706 | = xstrdup (fbsd_pid_to_exec_file (NULL, pid)); | |
707 | return wptid; | |
708 | } | |
709 | #endif | |
e58e05d6 JB |
710 | } |
711 | return wptid; | |
712 | } | |
713 | } | |
714 | ||
715 | #ifdef TDP_RFPPWAIT | |
716 | /* Target hook for follow_fork. On entry and at return inferior_ptid is | |
717 | the ptid of the followed inferior. */ | |
718 | ||
719 | static int | |
720 | fbsd_follow_fork (struct target_ops *ops, int follow_child, | |
721 | int detach_fork) | |
722 | { | |
723 | if (!follow_child) | |
724 | { | |
725 | struct thread_info *tp = inferior_thread (); | |
726 | pid_t child_pid = ptid_get_pid (tp->pending_follow.value.related_pid); | |
727 | ||
728 | /* Breakpoints have already been detached from the child by | |
729 | infrun.c. */ | |
730 | ||
731 | if (ptrace (PT_DETACH, child_pid, (PTRACE_TYPE_ARG3)1, 0) == -1) | |
732 | perror_with_name (("ptrace")); | |
733 | } | |
734 | ||
735 | return 0; | |
736 | } | |
737 | ||
738 | static int | |
739 | fbsd_insert_fork_catchpoint (struct target_ops *self, int pid) | |
740 | { | |
741 | return 0; | |
742 | } | |
743 | ||
744 | static int | |
745 | fbsd_remove_fork_catchpoint (struct target_ops *self, int pid) | |
746 | { | |
747 | return 0; | |
748 | } | |
749 | ||
750 | static int | |
751 | fbsd_insert_vfork_catchpoint (struct target_ops *self, int pid) | |
752 | { | |
753 | return 0; | |
754 | } | |
755 | ||
756 | static int | |
757 | fbsd_remove_vfork_catchpoint (struct target_ops *self, int pid) | |
758 | { | |
759 | return 0; | |
760 | } | |
761 | ||
762 | /* Enable fork tracing for a specific process. | |
763 | ||
764 | To catch fork events, PT_FOLLOW_FORK is set on every traced process | |
765 | to enable stops on returns from fork or vfork. Note that both the | |
766 | parent and child will always stop, even if system call stops are | |
767 | not enabled. */ | |
768 | ||
769 | static void | |
770 | fbsd_enable_follow_fork (pid_t pid) | |
771 | { | |
772 | if (ptrace (PT_FOLLOW_FORK, pid, (PTRACE_TYPE_ARG3)0, 1) == -1) | |
773 | perror_with_name (("ptrace")); | |
774 | } | |
6e9567fe | 775 | #endif |
e58e05d6 JB |
776 | |
777 | /* Implement the "to_post_startup_inferior" target_ops method. */ | |
778 | ||
779 | static void | |
780 | fbsd_post_startup_inferior (struct target_ops *self, ptid_t pid) | |
781 | { | |
6e9567fe | 782 | #ifdef TDP_RFPPWAIT |
e58e05d6 | 783 | fbsd_enable_follow_fork (ptid_get_pid (pid)); |
6e9567fe JB |
784 | #endif |
785 | #ifdef PT_LWP_EVENTS | |
786 | fbsd_enable_lwp_events (ptid_get_pid (pid)); | |
787 | #endif | |
e58e05d6 JB |
788 | } |
789 | ||
790 | /* Implement the "to_post_attach" target_ops method. */ | |
791 | ||
792 | static void | |
793 | fbsd_post_attach (struct target_ops *self, int pid) | |
794 | { | |
6e9567fe | 795 | #ifdef TDP_RFPPWAIT |
e58e05d6 | 796 | fbsd_enable_follow_fork (pid); |
e58e05d6 | 797 | #endif |
6e9567fe JB |
798 | #ifdef PT_LWP_EVENTS |
799 | fbsd_enable_lwp_events (pid); | |
800 | #endif | |
801 | fbsd_add_threads (pid); | |
802 | } | |
d2b41ca0 JB |
803 | |
804 | #ifdef PL_FLAG_EXEC | |
805 | /* If the FreeBSD kernel supports PL_FLAG_EXEC, then traced processes | |
806 | will always stop after exec. */ | |
807 | ||
808 | static int | |
809 | fbsd_insert_exec_catchpoint (struct target_ops *self, int pid) | |
810 | { | |
811 | return 0; | |
812 | } | |
813 | ||
814 | static int | |
815 | fbsd_remove_exec_catchpoint (struct target_ops *self, int pid) | |
816 | { | |
817 | return 0; | |
818 | } | |
819 | #endif | |
e58e05d6 JB |
820 | #endif |
821 | ||
8f60fe01 JB |
822 | void |
823 | fbsd_nat_add_target (struct target_ops *t) | |
824 | { | |
825 | t->to_pid_to_exec_file = fbsd_pid_to_exec_file; | |
826 | t->to_find_memory_regions = fbsd_find_memory_regions; | |
e58e05d6 | 827 | #ifdef PT_LWPINFO |
6e9567fe JB |
828 | t->to_thread_alive = fbsd_thread_alive; |
829 | t->to_pid_to_str = fbsd_pid_to_str; | |
830 | #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME | |
831 | t->to_thread_name = fbsd_thread_name; | |
832 | #endif | |
833 | t->to_update_thread_list = fbsd_update_thread_list; | |
834 | t->to_has_thread_control = tc_schedlock; | |
835 | super_resume = t->to_resume; | |
836 | t->to_resume = fbsd_resume; | |
e58e05d6 JB |
837 | super_wait = t->to_wait; |
838 | t->to_wait = fbsd_wait; | |
6e9567fe JB |
839 | t->to_post_startup_inferior = fbsd_post_startup_inferior; |
840 | t->to_post_attach = fbsd_post_attach; | |
e58e05d6 JB |
841 | #ifdef TDP_RFPPWAIT |
842 | t->to_follow_fork = fbsd_follow_fork; | |
843 | t->to_insert_fork_catchpoint = fbsd_insert_fork_catchpoint; | |
844 | t->to_remove_fork_catchpoint = fbsd_remove_fork_catchpoint; | |
845 | t->to_insert_vfork_catchpoint = fbsd_insert_vfork_catchpoint; | |
846 | t->to_remove_vfork_catchpoint = fbsd_remove_vfork_catchpoint; | |
e58e05d6 | 847 | #endif |
d2b41ca0 JB |
848 | #ifdef PL_FLAG_EXEC |
849 | t->to_insert_exec_catchpoint = fbsd_insert_exec_catchpoint; | |
850 | t->to_remove_exec_catchpoint = fbsd_remove_exec_catchpoint; | |
851 | #endif | |
e58e05d6 | 852 | #endif |
8f60fe01 JB |
853 | add_target (t); |
854 | } | |
6e9567fe JB |
855 | |
856 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
857 | extern initialize_file_ftype _initialize_fbsd_nat; | |
858 | ||
859 | void | |
860 | _initialize_fbsd_nat (void) | |
861 | { | |
862 | #ifdef PT_LWPINFO | |
863 | add_setshow_boolean_cmd ("fbsd-lwp", class_maintenance, | |
864 | &debug_fbsd_lwp, _("\ | |
865 | Set debugging of FreeBSD lwp module."), _("\ | |
866 | Show debugging of FreeBSD lwp module."), _("\ | |
867 | Enables printf debugging output."), | |
868 | NULL, | |
869 | &show_fbsd_lwp_debug, | |
870 | &setdebuglist, &showdebuglist); | |
871 | #endif | |
872 | } |