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578c1c03 MK |
1 | /* Native-dependent code for FreeBSD. |
2 | ||
61baf725 | 3 | Copyright (C) 2002-2017 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> |
929edea9 | 31 | #include <sys/signal.h> |
68b9939a | 32 | #include <sys/sysctl.h> |
25268153 JB |
33 | #ifdef HAVE_KINFO_GETVMMAP |
34 | #include <sys/user.h> | |
35 | #include <libutil.h> | |
36 | #endif | |
578c1c03 MK |
37 | |
38 | #include "elf-bfd.h" | |
39 | #include "fbsd-nat.h" | |
40 | ||
766062f6 | 41 | /* Return the name of a file that can be opened to get the symbols for |
578c1c03 MK |
42 | the child process identified by PID. */ |
43 | ||
8f60fe01 | 44 | static char * |
8dd27370 | 45 | fbsd_pid_to_exec_file (struct target_ops *self, int pid) |
578c1c03 | 46 | { |
f2feec98 | 47 | ssize_t len; |
b4ab256d HZ |
48 | static char buf[PATH_MAX]; |
49 | char name[PATH_MAX]; | |
578c1c03 | 50 | |
68b9939a | 51 | #ifdef KERN_PROC_PATHNAME |
f2feec98 | 52 | size_t buflen; |
68b9939a | 53 | int mib[4]; |
578c1c03 | 54 | |
68b9939a MK |
55 | mib[0] = CTL_KERN; |
56 | mib[1] = KERN_PROC; | |
57 | mib[2] = KERN_PROC_PATHNAME; | |
58 | mib[3] = pid; | |
f2feec98 JB |
59 | buflen = sizeof buf; |
60 | if (sysctl (mib, 4, buf, &buflen, NULL, 0) == 0) | |
578c1c03 | 61 | return buf; |
68b9939a | 62 | #endif |
578c1c03 | 63 | |
b4ab256d HZ |
64 | xsnprintf (name, PATH_MAX, "/proc/%d/exe", pid); |
65 | len = readlink (name, buf, PATH_MAX - 1); | |
66 | if (len != -1) | |
68b9939a | 67 | { |
b4ab256d HZ |
68 | buf[len] = '\0'; |
69 | return buf; | |
68b9939a MK |
70 | } |
71 | ||
b4ab256d | 72 | return NULL; |
578c1c03 MK |
73 | } |
74 | ||
25268153 JB |
75 | #ifdef HAVE_KINFO_GETVMMAP |
76 | /* Iterate over all the memory regions in the current inferior, | |
77 | calling FUNC for each memory region. OBFD is passed as the last | |
78 | argument to FUNC. */ | |
79 | ||
8f60fe01 | 80 | static int |
25268153 JB |
81 | fbsd_find_memory_regions (struct target_ops *self, |
82 | find_memory_region_ftype func, void *obfd) | |
83 | { | |
84 | pid_t pid = ptid_get_pid (inferior_ptid); | |
85 | struct kinfo_vmentry *vmentl, *kve; | |
86 | uint64_t size; | |
87 | struct cleanup *cleanup; | |
88 | int i, nitems; | |
89 | ||
90 | vmentl = kinfo_getvmmap (pid, &nitems); | |
91 | if (vmentl == NULL) | |
92 | perror_with_name (_("Couldn't fetch VM map entries.")); | |
93 | cleanup = make_cleanup (free, vmentl); | |
94 | ||
95 | for (i = 0; i < nitems; i++) | |
96 | { | |
97 | kve = &vmentl[i]; | |
98 | ||
99 | /* Skip unreadable segments and those where MAP_NOCORE has been set. */ | |
100 | if (!(kve->kve_protection & KVME_PROT_READ) | |
101 | || kve->kve_flags & KVME_FLAG_NOCOREDUMP) | |
102 | continue; | |
103 | ||
104 | /* Skip segments with an invalid type. */ | |
105 | if (kve->kve_type != KVME_TYPE_DEFAULT | |
106 | && kve->kve_type != KVME_TYPE_VNODE | |
107 | && kve->kve_type != KVME_TYPE_SWAP | |
108 | && kve->kve_type != KVME_TYPE_PHYS) | |
109 | continue; | |
110 | ||
111 | size = kve->kve_end - kve->kve_start; | |
112 | if (info_verbose) | |
113 | { | |
114 | fprintf_filtered (gdb_stdout, | |
115 | "Save segment, %ld bytes at %s (%c%c%c)\n", | |
116 | (long) size, | |
117 | paddress (target_gdbarch (), kve->kve_start), | |
118 | kve->kve_protection & KVME_PROT_READ ? 'r' : '-', | |
119 | kve->kve_protection & KVME_PROT_WRITE ? 'w' : '-', | |
120 | kve->kve_protection & KVME_PROT_EXEC ? 'x' : '-'); | |
121 | } | |
122 | ||
123 | /* Invoke the callback function to create the corefile segment. | |
124 | Pass MODIFIED as true, we do not know the real modification state. */ | |
125 | func (kve->kve_start, size, kve->kve_protection & KVME_PROT_READ, | |
126 | kve->kve_protection & KVME_PROT_WRITE, | |
127 | kve->kve_protection & KVME_PROT_EXEC, 1, obfd); | |
128 | } | |
129 | do_cleanups (cleanup); | |
130 | return 0; | |
131 | } | |
132 | #else | |
578c1c03 MK |
133 | static int |
134 | fbsd_read_mapping (FILE *mapfile, unsigned long *start, unsigned long *end, | |
135 | char *protection) | |
136 | { | |
137 | /* FreeBSD 5.1-RELEASE uses a 256-byte buffer. */ | |
138 | char buf[256]; | |
139 | int resident, privateresident; | |
140 | unsigned long obj; | |
141 | int ret = EOF; | |
142 | ||
143 | /* As of FreeBSD 5.0-RELEASE, the layout is described in | |
144 | /usr/src/sys/fs/procfs/procfs_map.c. Somewhere in 5.1-CURRENT a | |
145 | new column was added to the procfs map. Therefore we can't use | |
146 | fscanf since we need to support older releases too. */ | |
147 | if (fgets (buf, sizeof buf, mapfile) != NULL) | |
148 | ret = sscanf (buf, "%lx %lx %d %d %lx %s", start, end, | |
149 | &resident, &privateresident, &obj, protection); | |
150 | ||
151 | return (ret != 0 && ret != EOF); | |
152 | } | |
153 | ||
154 | /* Iterate over all the memory regions in the current inferior, | |
155 | calling FUNC for each memory region. OBFD is passed as the last | |
156 | argument to FUNC. */ | |
157 | ||
8f60fe01 | 158 | static int |
2e73927c TT |
159 | fbsd_find_memory_regions (struct target_ops *self, |
160 | find_memory_region_ftype func, void *obfd) | |
578c1c03 MK |
161 | { |
162 | pid_t pid = ptid_get_pid (inferior_ptid); | |
163 | char *mapfilename; | |
164 | FILE *mapfile; | |
165 | unsigned long start, end, size; | |
166 | char protection[4]; | |
167 | int read, write, exec; | |
7c8a8b04 | 168 | struct cleanup *cleanup; |
578c1c03 MK |
169 | |
170 | mapfilename = xstrprintf ("/proc/%ld/map", (long) pid); | |
7c8a8b04 | 171 | cleanup = make_cleanup (xfree, mapfilename); |
578c1c03 MK |
172 | mapfile = fopen (mapfilename, "r"); |
173 | if (mapfile == NULL) | |
8a3fe4f8 | 174 | error (_("Couldn't open %s."), mapfilename); |
7c8a8b04 | 175 | make_cleanup_fclose (mapfile); |
578c1c03 MK |
176 | |
177 | if (info_verbose) | |
178 | fprintf_filtered (gdb_stdout, | |
179 | "Reading memory regions from %s\n", mapfilename); | |
180 | ||
181 | /* Now iterate until end-of-file. */ | |
182 | while (fbsd_read_mapping (mapfile, &start, &end, &protection[0])) | |
183 | { | |
184 | size = end - start; | |
185 | ||
186 | read = (strchr (protection, 'r') != 0); | |
187 | write = (strchr (protection, 'w') != 0); | |
188 | exec = (strchr (protection, 'x') != 0); | |
189 | ||
190 | if (info_verbose) | |
191 | { | |
192 | fprintf_filtered (gdb_stdout, | |
5af949e3 | 193 | "Save segment, %ld bytes at %s (%c%c%c)\n", |
f5656ead | 194 | size, paddress (target_gdbarch (), start), |
578c1c03 MK |
195 | read ? 'r' : '-', |
196 | write ? 'w' : '-', | |
197 | exec ? 'x' : '-'); | |
198 | } | |
199 | ||
4f69f4c2 JK |
200 | /* Invoke the callback function to create the corefile segment. |
201 | Pass MODIFIED as true, we do not know the real modification state. */ | |
202 | func (start, size, read, write, exec, 1, obfd); | |
578c1c03 MK |
203 | } |
204 | ||
7c8a8b04 | 205 | do_cleanups (cleanup); |
578c1c03 MK |
206 | return 0; |
207 | } | |
25268153 | 208 | #endif |
8f60fe01 | 209 | |
7697fc9e JB |
210 | #ifdef KERN_PROC_AUXV |
211 | static enum target_xfer_status (*super_xfer_partial) (struct target_ops *ops, | |
212 | enum target_object object, | |
213 | const char *annex, | |
214 | gdb_byte *readbuf, | |
215 | const gdb_byte *writebuf, | |
216 | ULONGEST offset, | |
217 | ULONGEST len, | |
218 | ULONGEST *xfered_len); | |
219 | ||
929edea9 JB |
220 | #ifdef PT_LWPINFO |
221 | /* Return the size of siginfo for the current inferior. */ | |
222 | ||
223 | #ifdef __LP64__ | |
224 | union sigval32 { | |
225 | int sival_int; | |
226 | uint32_t sival_ptr; | |
227 | }; | |
228 | ||
229 | /* This structure matches the naming and layout of `siginfo_t' in | |
230 | <sys/signal.h>. In particular, the `si_foo' macros defined in that | |
231 | header can be used with both types to copy fields in the `_reason' | |
232 | union. */ | |
233 | ||
234 | struct siginfo32 | |
235 | { | |
236 | int si_signo; | |
237 | int si_errno; | |
238 | int si_code; | |
239 | __pid_t si_pid; | |
240 | __uid_t si_uid; | |
241 | int si_status; | |
242 | uint32_t si_addr; | |
243 | union sigval32 si_value; | |
244 | union | |
245 | { | |
246 | struct | |
247 | { | |
248 | int _trapno; | |
249 | } _fault; | |
250 | struct | |
251 | { | |
252 | int _timerid; | |
253 | int _overrun; | |
254 | } _timer; | |
255 | struct | |
256 | { | |
257 | int _mqd; | |
258 | } _mesgq; | |
259 | struct | |
260 | { | |
261 | int32_t _band; | |
262 | } _poll; | |
263 | struct | |
264 | { | |
265 | int32_t __spare1__; | |
266 | int __spare2__[7]; | |
267 | } __spare__; | |
268 | } _reason; | |
269 | }; | |
270 | #endif | |
271 | ||
272 | static size_t | |
273 | fbsd_siginfo_size () | |
274 | { | |
275 | #ifdef __LP64__ | |
276 | struct gdbarch *gdbarch = get_frame_arch (get_current_frame ()); | |
277 | ||
278 | /* Is the inferior 32-bit? If so, use the 32-bit siginfo size. */ | |
279 | if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) | |
280 | return sizeof (struct siginfo32); | |
281 | #endif | |
282 | return sizeof (siginfo_t); | |
283 | } | |
284 | ||
285 | /* Convert a native 64-bit siginfo object to a 32-bit object. Note | |
286 | that FreeBSD doesn't support writing to $_siginfo, so this only | |
287 | needs to convert one way. */ | |
288 | ||
289 | static void | |
290 | fbsd_convert_siginfo (siginfo_t *si) | |
291 | { | |
292 | #ifdef __LP64__ | |
293 | struct gdbarch *gdbarch = get_frame_arch (get_current_frame ()); | |
294 | ||
295 | /* Is the inferior 32-bit? If not, nothing to do. */ | |
296 | if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word != 32) | |
297 | return; | |
298 | ||
299 | struct siginfo32 si32; | |
300 | ||
301 | si32.si_signo = si->si_signo; | |
302 | si32.si_errno = si->si_errno; | |
303 | si32.si_code = si->si_code; | |
304 | si32.si_pid = si->si_pid; | |
305 | si32.si_uid = si->si_uid; | |
306 | si32.si_status = si->si_status; | |
307 | si32.si_addr = (uintptr_t) si->si_addr; | |
308 | ||
309 | /* If sival_ptr is being used instead of sival_int on a big-endian | |
310 | platform, then sival_int will be zero since it holds the upper | |
311 | 32-bits of the pointer value. */ | |
312 | #if _BYTE_ORDER == _BIG_ENDIAN | |
313 | if (si->si_value.sival_int == 0) | |
314 | si32->si_value.sival_ptr = (uintptr_t) si->si_value.sival_ptr; | |
315 | else | |
316 | si32.si_value.sival_int = si->si_value.sival_int; | |
317 | #else | |
318 | si32.si_value.sival_int = si->si_value.sival_int; | |
319 | #endif | |
320 | ||
321 | /* Always copy the spare fields and then possibly overwrite them for | |
322 | signal-specific or code-specific fields. */ | |
323 | si32._reason.__spare__.__spare1__ = si->_reason.__spare__.__spare1__; | |
324 | for (int i = 0; i < 7; i++) | |
325 | si32._reason.__spare__.__spare2__[i] = si->_reason.__spare__.__spare2__[i]; | |
326 | switch (si->si_signo) { | |
327 | case SIGILL: | |
328 | case SIGFPE: | |
329 | case SIGSEGV: | |
330 | case SIGBUS: | |
331 | si32.si_trapno = si->si_trapno; | |
332 | break; | |
333 | } | |
334 | switch (si->si_code) { | |
335 | case SI_TIMER: | |
336 | si32.si_timerid = si->si_timerid; | |
337 | si32.si_overrun = si->si_overrun; | |
338 | break; | |
339 | case SI_MESGQ: | |
340 | si32.si_mqd = si->si_mqd; | |
341 | break; | |
342 | } | |
343 | ||
344 | memcpy(si, &si32, sizeof (si32)); | |
345 | #endif | |
346 | } | |
347 | #endif | |
348 | ||
7697fc9e JB |
349 | /* Implement the "to_xfer_partial target_ops" method. */ |
350 | ||
351 | static enum target_xfer_status | |
352 | fbsd_xfer_partial (struct target_ops *ops, enum target_object object, | |
353 | const char *annex, gdb_byte *readbuf, | |
354 | const gdb_byte *writebuf, | |
355 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) | |
356 | { | |
357 | pid_t pid = ptid_get_pid (inferior_ptid); | |
358 | ||
359 | switch (object) | |
360 | { | |
929edea9 JB |
361 | #ifdef PT_LWPINFO |
362 | case TARGET_OBJECT_SIGNAL_INFO: | |
363 | { | |
364 | struct ptrace_lwpinfo pl; | |
365 | size_t siginfo_size; | |
366 | ||
367 | /* FreeBSD doesn't support writing to $_siginfo. */ | |
368 | if (writebuf != NULL) | |
369 | return TARGET_XFER_E_IO; | |
370 | ||
371 | if (inferior_ptid.lwp_p ()) | |
372 | pid = inferior_ptid.lwp (); | |
373 | ||
374 | siginfo_size = fbsd_siginfo_size (); | |
375 | if (offset > siginfo_size) | |
376 | return TARGET_XFER_E_IO; | |
377 | ||
378 | if (ptrace (PT_LWPINFO, pid, (PTRACE_TYPE_ARG3) &pl, sizeof (pl)) == -1) | |
379 | return TARGET_XFER_E_IO; | |
380 | ||
381 | if (!(pl.pl_flags & PL_FLAG_SI)) | |
382 | return TARGET_XFER_E_IO; | |
383 | ||
384 | fbsd_convert_siginfo (&pl.pl_siginfo); | |
385 | if (offset + len > siginfo_size) | |
386 | len = siginfo_size - offset; | |
387 | ||
388 | memcpy (readbuf, ((gdb_byte *) &pl.pl_siginfo) + offset, len); | |
389 | *xfered_len = len; | |
390 | return TARGET_XFER_OK; | |
391 | } | |
392 | #endif | |
7697fc9e JB |
393 | case TARGET_OBJECT_AUXV: |
394 | { | |
395 | struct cleanup *cleanup = make_cleanup (null_cleanup, NULL); | |
396 | unsigned char *buf; | |
397 | size_t buflen; | |
398 | int mib[4]; | |
399 | ||
400 | if (writebuf != NULL) | |
401 | return TARGET_XFER_E_IO; | |
402 | mib[0] = CTL_KERN; | |
403 | mib[1] = KERN_PROC; | |
404 | mib[2] = KERN_PROC_AUXV; | |
405 | mib[3] = pid; | |
406 | if (offset == 0) | |
407 | { | |
408 | buf = readbuf; | |
409 | buflen = len; | |
410 | } | |
411 | else | |
412 | { | |
413 | buflen = offset + len; | |
414 | buf = XCNEWVEC (unsigned char, buflen); | |
415 | cleanup = make_cleanup (xfree, buf); | |
416 | } | |
417 | if (sysctl (mib, 4, buf, &buflen, NULL, 0) == 0) | |
418 | { | |
419 | if (offset != 0) | |
420 | { | |
421 | if (buflen > offset) | |
422 | { | |
423 | buflen -= offset; | |
424 | memcpy (readbuf, buf + offset, buflen); | |
425 | } | |
426 | else | |
427 | buflen = 0; | |
428 | } | |
429 | do_cleanups (cleanup); | |
430 | *xfered_len = buflen; | |
431 | return (buflen == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; | |
432 | } | |
433 | do_cleanups (cleanup); | |
434 | return TARGET_XFER_E_IO; | |
435 | } | |
436 | default: | |
437 | return super_xfer_partial (ops, object, annex, readbuf, writebuf, offset, | |
438 | len, xfered_len); | |
439 | } | |
440 | } | |
441 | #endif | |
442 | ||
e58e05d6 | 443 | #ifdef PT_LWPINFO |
6e9567fe JB |
444 | static int debug_fbsd_lwp; |
445 | ||
8607ea63 JB |
446 | static void (*super_resume) (struct target_ops *, |
447 | ptid_t, | |
448 | int, | |
449 | enum gdb_signal); | |
e58e05d6 JB |
450 | static ptid_t (*super_wait) (struct target_ops *, |
451 | ptid_t, | |
452 | struct target_waitstatus *, | |
453 | int); | |
454 | ||
6e9567fe JB |
455 | static void |
456 | show_fbsd_lwp_debug (struct ui_file *file, int from_tty, | |
457 | struct cmd_list_element *c, const char *value) | |
458 | { | |
459 | fprintf_filtered (file, _("Debugging of FreeBSD lwp module is %s.\n"), value); | |
460 | } | |
461 | ||
462 | #if defined(TDP_RFPPWAIT) || defined(HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME) | |
463 | /* Fetch the external variant of the kernel's internal process | |
464 | structure for the process PID into KP. */ | |
465 | ||
466 | static void | |
467 | fbsd_fetch_kinfo_proc (pid_t pid, struct kinfo_proc *kp) | |
468 | { | |
469 | size_t len; | |
470 | int mib[4]; | |
471 | ||
472 | len = sizeof *kp; | |
473 | mib[0] = CTL_KERN; | |
474 | mib[1] = KERN_PROC; | |
475 | mib[2] = KERN_PROC_PID; | |
476 | mib[3] = pid; | |
477 | if (sysctl (mib, 4, kp, &len, NULL, 0) == -1) | |
478 | perror_with_name (("sysctl")); | |
479 | } | |
480 | #endif | |
481 | ||
482 | /* | |
483 | FreeBSD's first thread support was via a "reentrant" version of libc | |
484 | (libc_r) that first shipped in 2.2.7. This library multiplexed all | |
485 | of the threads in a process onto a single kernel thread. This | |
4c7bf4f9 | 486 | library was supported via the bsd-uthread target. |
6e9567fe JB |
487 | |
488 | FreeBSD 5.1 introduced two new threading libraries that made use of | |
489 | multiple kernel threads. The first (libkse) scheduled M user | |
490 | threads onto N (<= M) kernel threads (LWPs). The second (libthr) | |
491 | bound each user thread to a dedicated kernel thread. libkse shipped | |
492 | as the default threading library (libpthread). | |
493 | ||
494 | FreeBSD 5.3 added a libthread_db to abstract the interface across | |
495 | the various thread libraries (libc_r, libkse, and libthr). | |
496 | ||
497 | FreeBSD 7.0 switched the default threading library from from libkse | |
498 | to libpthread and removed libc_r. | |
499 | ||
500 | FreeBSD 8.0 removed libkse and the in-kernel support for it. The | |
501 | only threading library supported by 8.0 and later is libthr which | |
502 | ties each user thread directly to an LWP. To simplify the | |
503 | implementation, this target only supports LWP-backed threads using | |
504 | ptrace directly rather than libthread_db. | |
505 | ||
506 | FreeBSD 11.0 introduced LWP event reporting via PT_LWP_EVENTS. | |
507 | */ | |
508 | ||
509 | /* Return true if PTID is still active in the inferior. */ | |
510 | ||
511 | static int | |
512 | fbsd_thread_alive (struct target_ops *ops, ptid_t ptid) | |
513 | { | |
514 | if (ptid_lwp_p (ptid)) | |
515 | { | |
516 | struct ptrace_lwpinfo pl; | |
517 | ||
518 | if (ptrace (PT_LWPINFO, ptid_get_lwp (ptid), (caddr_t) &pl, sizeof pl) | |
519 | == -1) | |
520 | return 0; | |
521 | #ifdef PL_FLAG_EXITED | |
522 | if (pl.pl_flags & PL_FLAG_EXITED) | |
523 | return 0; | |
524 | #endif | |
525 | } | |
526 | ||
527 | return 1; | |
528 | } | |
529 | ||
530 | /* Convert PTID to a string. Returns the string in a static | |
531 | buffer. */ | |
532 | ||
7a114964 | 533 | static const char * |
6e9567fe JB |
534 | fbsd_pid_to_str (struct target_ops *ops, ptid_t ptid) |
535 | { | |
536 | lwpid_t lwp; | |
537 | ||
538 | lwp = ptid_get_lwp (ptid); | |
539 | if (lwp != 0) | |
540 | { | |
541 | static char buf[64]; | |
542 | int pid = ptid_get_pid (ptid); | |
543 | ||
b2bae2f7 | 544 | xsnprintf (buf, sizeof buf, "LWP %d of process %d", lwp, pid); |
6e9567fe JB |
545 | return buf; |
546 | } | |
547 | ||
548 | return normal_pid_to_str (ptid); | |
549 | } | |
550 | ||
551 | #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME | |
552 | /* Return the name assigned to a thread by an application. Returns | |
553 | the string in a static buffer. */ | |
554 | ||
555 | static const char * | |
556 | fbsd_thread_name (struct target_ops *self, struct thread_info *thr) | |
557 | { | |
558 | struct ptrace_lwpinfo pl; | |
559 | struct kinfo_proc kp; | |
560 | int pid = ptid_get_pid (thr->ptid); | |
561 | long lwp = ptid_get_lwp (thr->ptid); | |
562 | static char buf[sizeof pl.pl_tdname + 1]; | |
563 | ||
564 | /* Note that ptrace_lwpinfo returns the process command in pl_tdname | |
565 | if a name has not been set explicitly. Return a NULL name in | |
566 | that case. */ | |
567 | fbsd_fetch_kinfo_proc (pid, &kp); | |
568 | if (ptrace (PT_LWPINFO, lwp, (caddr_t) &pl, sizeof pl) == -1) | |
569 | perror_with_name (("ptrace")); | |
570 | if (strcmp (kp.ki_comm, pl.pl_tdname) == 0) | |
571 | return NULL; | |
572 | xsnprintf (buf, sizeof buf, "%s", pl.pl_tdname); | |
573 | return buf; | |
574 | } | |
575 | #endif | |
576 | ||
da95a26c | 577 | /* Enable additional event reporting on new processes. |
6e9567fe | 578 | |
da95a26c JB |
579 | To catch fork events, PTRACE_FORK is set on every traced process |
580 | to enable stops on returns from fork or vfork. Note that both the | |
581 | parent and child will always stop, even if system call stops are | |
582 | not enabled. | |
583 | ||
584 | To catch LWP events, PTRACE_EVENTS is set on every traced process. | |
6e9567fe JB |
585 | This enables stops on the birth for new LWPs (excluding the "main" LWP) |
586 | and the death of LWPs (excluding the last LWP in a process). Note | |
587 | that unlike fork events, the LWP that creates a new LWP does not | |
588 | report an event. */ | |
589 | ||
590 | static void | |
da95a26c | 591 | fbsd_enable_proc_events (pid_t pid) |
6e9567fe | 592 | { |
da95a26c JB |
593 | #ifdef PT_GET_EVENT_MASK |
594 | int events; | |
595 | ||
596 | if (ptrace (PT_GET_EVENT_MASK, pid, (PTRACE_TYPE_ARG3)&events, | |
597 | sizeof (events)) == -1) | |
598 | perror_with_name (("ptrace")); | |
599 | events |= PTRACE_FORK | PTRACE_LWP; | |
dbaed385 JB |
600 | #ifdef PTRACE_VFORK |
601 | events |= PTRACE_VFORK; | |
602 | #endif | |
da95a26c JB |
603 | if (ptrace (PT_SET_EVENT_MASK, pid, (PTRACE_TYPE_ARG3)&events, |
604 | sizeof (events)) == -1) | |
605 | perror_with_name (("ptrace")); | |
606 | #else | |
607 | #ifdef TDP_RFPPWAIT | |
608 | if (ptrace (PT_FOLLOW_FORK, pid, (PTRACE_TYPE_ARG3)0, 1) == -1) | |
609 | perror_with_name (("ptrace")); | |
610 | #endif | |
611 | #ifdef PT_LWP_EVENTS | |
6e9567fe JB |
612 | if (ptrace (PT_LWP_EVENTS, pid, (PTRACE_TYPE_ARG3)0, 1) == -1) |
613 | perror_with_name (("ptrace")); | |
6e9567fe | 614 | #endif |
da95a26c JB |
615 | #endif |
616 | } | |
6e9567fe JB |
617 | |
618 | /* Add threads for any new LWPs in a process. | |
619 | ||
620 | When LWP events are used, this function is only used to detect existing | |
621 | threads when attaching to a process. On older systems, this function is | |
622 | called to discover new threads each time the thread list is updated. */ | |
623 | ||
624 | static void | |
625 | fbsd_add_threads (pid_t pid) | |
626 | { | |
627 | struct cleanup *cleanup; | |
628 | lwpid_t *lwps; | |
629 | int i, nlwps; | |
630 | ||
631 | gdb_assert (!in_thread_list (pid_to_ptid (pid))); | |
632 | nlwps = ptrace (PT_GETNUMLWPS, pid, NULL, 0); | |
633 | if (nlwps == -1) | |
634 | perror_with_name (("ptrace")); | |
635 | ||
636 | lwps = XCNEWVEC (lwpid_t, nlwps); | |
637 | cleanup = make_cleanup (xfree, lwps); | |
638 | ||
639 | nlwps = ptrace (PT_GETLWPLIST, pid, (caddr_t) lwps, nlwps); | |
640 | if (nlwps == -1) | |
641 | perror_with_name (("ptrace")); | |
642 | ||
643 | for (i = 0; i < nlwps; i++) | |
644 | { | |
645 | ptid_t ptid = ptid_build (pid, lwps[i], 0); | |
646 | ||
647 | if (!in_thread_list (ptid)) | |
648 | { | |
649 | #ifdef PT_LWP_EVENTS | |
650 | struct ptrace_lwpinfo pl; | |
651 | ||
652 | /* Don't add exited threads. Note that this is only called | |
653 | when attaching to a multi-threaded process. */ | |
654 | if (ptrace (PT_LWPINFO, lwps[i], (caddr_t) &pl, sizeof pl) == -1) | |
655 | perror_with_name (("ptrace")); | |
656 | if (pl.pl_flags & PL_FLAG_EXITED) | |
657 | continue; | |
658 | #endif | |
659 | if (debug_fbsd_lwp) | |
660 | fprintf_unfiltered (gdb_stdlog, | |
661 | "FLWP: adding thread for LWP %u\n", | |
662 | lwps[i]); | |
663 | add_thread (ptid); | |
664 | } | |
665 | } | |
666 | do_cleanups (cleanup); | |
667 | } | |
668 | ||
669 | /* Implement the "to_update_thread_list" target_ops method. */ | |
670 | ||
671 | static void | |
672 | fbsd_update_thread_list (struct target_ops *ops) | |
673 | { | |
674 | #ifdef PT_LWP_EVENTS | |
675 | /* With support for thread events, threads are added/deleted from the | |
676 | list as events are reported, so just try deleting exited threads. */ | |
677 | delete_exited_threads (); | |
678 | #else | |
679 | prune_threads (); | |
680 | ||
681 | fbsd_add_threads (ptid_get_pid (inferior_ptid)); | |
682 | #endif | |
683 | } | |
684 | ||
e58e05d6 JB |
685 | #ifdef TDP_RFPPWAIT |
686 | /* | |
687 | To catch fork events, PT_FOLLOW_FORK is set on every traced process | |
688 | to enable stops on returns from fork or vfork. Note that both the | |
689 | parent and child will always stop, even if system call stops are not | |
690 | enabled. | |
691 | ||
692 | After a fork, both the child and parent process will stop and report | |
693 | an event. However, there is no guarantee of order. If the parent | |
694 | reports its stop first, then fbsd_wait explicitly waits for the new | |
695 | child before returning. If the child reports its stop first, then | |
696 | the event is saved on a list and ignored until the parent's stop is | |
697 | reported. fbsd_wait could have been changed to fetch the parent PID | |
698 | of the new child and used that to wait for the parent explicitly. | |
699 | However, if two threads in the parent fork at the same time, then | |
700 | the wait on the parent might return the "wrong" fork event. | |
701 | ||
702 | The initial version of PT_FOLLOW_FORK did not set PL_FLAG_CHILD for | |
703 | the new child process. This flag could be inferred by treating any | |
704 | events for an unknown pid as a new child. | |
705 | ||
706 | In addition, the initial version of PT_FOLLOW_FORK did not report a | |
707 | stop event for the parent process of a vfork until after the child | |
708 | process executed a new program or exited. The kernel was changed to | |
709 | defer the wait for exit or exec of the child until after posting the | |
710 | stop event shortly after the change to introduce PL_FLAG_CHILD. | |
711 | This could be worked around by reporting a vfork event when the | |
712 | child event posted and ignoring the subsequent event from the | |
713 | parent. | |
714 | ||
715 | This implementation requires both of these fixes for simplicity's | |
716 | sake. FreeBSD versions newer than 9.1 contain both fixes. | |
717 | */ | |
718 | ||
2c5c2a33 | 719 | struct fbsd_fork_info |
e58e05d6 | 720 | { |
2c5c2a33 JB |
721 | struct fbsd_fork_info *next; |
722 | ptid_t ptid; | |
e58e05d6 JB |
723 | }; |
724 | ||
2c5c2a33 | 725 | static struct fbsd_fork_info *fbsd_pending_children; |
e58e05d6 JB |
726 | |
727 | /* Record a new child process event that is reported before the | |
728 | corresponding fork event in the parent. */ | |
729 | ||
730 | static void | |
6e9567fe | 731 | fbsd_remember_child (ptid_t pid) |
e58e05d6 | 732 | { |
2c5c2a33 | 733 | struct fbsd_fork_info *info = XCNEW (struct fbsd_fork_info); |
e58e05d6 | 734 | |
2c5c2a33 | 735 | info->ptid = pid; |
e58e05d6 JB |
736 | info->next = fbsd_pending_children; |
737 | fbsd_pending_children = info; | |
738 | } | |
739 | ||
740 | /* Check for a previously-recorded new child process event for PID. | |
6e9567fe | 741 | If one is found, remove it from the list and return the PTID. */ |
e58e05d6 | 742 | |
6e9567fe | 743 | static ptid_t |
e58e05d6 JB |
744 | fbsd_is_child_pending (pid_t pid) |
745 | { | |
2c5c2a33 | 746 | struct fbsd_fork_info *info, *prev; |
6e9567fe | 747 | ptid_t ptid; |
e58e05d6 JB |
748 | |
749 | prev = NULL; | |
750 | for (info = fbsd_pending_children; info; prev = info, info = info->next) | |
751 | { | |
2c5c2a33 | 752 | if (ptid_get_pid (info->ptid) == pid) |
e58e05d6 JB |
753 | { |
754 | if (prev == NULL) | |
755 | fbsd_pending_children = info->next; | |
756 | else | |
757 | prev->next = info->next; | |
2c5c2a33 | 758 | ptid = info->ptid; |
e58e05d6 | 759 | xfree (info); |
6e9567fe | 760 | return ptid; |
e58e05d6 JB |
761 | } |
762 | } | |
6e9567fe | 763 | return null_ptid; |
e58e05d6 | 764 | } |
2c5c2a33 | 765 | |
dbaed385 | 766 | #ifndef PTRACE_VFORK |
2c5c2a33 JB |
767 | static struct fbsd_fork_info *fbsd_pending_vfork_done; |
768 | ||
769 | /* Record a pending vfork done event. */ | |
770 | ||
771 | static void | |
772 | fbsd_add_vfork_done (ptid_t pid) | |
773 | { | |
774 | struct fbsd_fork_info *info = XCNEW (struct fbsd_fork_info); | |
775 | ||
776 | info->ptid = pid; | |
777 | info->next = fbsd_pending_vfork_done; | |
778 | fbsd_pending_vfork_done = info; | |
779 | } | |
780 | ||
781 | /* Check for a pending vfork done event for a specific PID. */ | |
782 | ||
783 | static int | |
784 | fbsd_is_vfork_done_pending (pid_t pid) | |
785 | { | |
786 | struct fbsd_fork_info *info; | |
787 | ||
788 | for (info = fbsd_pending_vfork_done; info != NULL; info = info->next) | |
789 | { | |
790 | if (ptid_get_pid (info->ptid) == pid) | |
791 | return 1; | |
792 | } | |
793 | return 0; | |
794 | } | |
795 | ||
796 | /* Check for a pending vfork done event. If one is found, remove it | |
797 | from the list and return the PTID. */ | |
798 | ||
ee950322 | 799 | static ptid_t |
2c5c2a33 JB |
800 | fbsd_next_vfork_done (void) |
801 | { | |
802 | struct fbsd_fork_info *info; | |
803 | ptid_t ptid; | |
804 | ||
805 | if (fbsd_pending_vfork_done != NULL) | |
806 | { | |
807 | info = fbsd_pending_vfork_done; | |
808 | fbsd_pending_vfork_done = info->next; | |
809 | ptid = info->ptid; | |
810 | xfree (info); | |
811 | return ptid; | |
812 | } | |
813 | return null_ptid; | |
814 | } | |
e58e05d6 | 815 | #endif |
dbaed385 | 816 | #endif |
e58e05d6 | 817 | |
8607ea63 JB |
818 | /* Implement the "to_resume" target_ops method. */ |
819 | ||
820 | static void | |
821 | fbsd_resume (struct target_ops *ops, | |
822 | ptid_t ptid, int step, enum gdb_signal signo) | |
823 | { | |
dbaed385 | 824 | #if defined(TDP_RFPPWAIT) && !defined(PTRACE_VFORK) |
2c5c2a33 JB |
825 | pid_t pid; |
826 | ||
827 | /* Don't PT_CONTINUE a process which has a pending vfork done event. */ | |
828 | if (ptid_equal (minus_one_ptid, ptid)) | |
829 | pid = ptid_get_pid (inferior_ptid); | |
830 | else | |
831 | pid = ptid_get_pid (ptid); | |
832 | if (fbsd_is_vfork_done_pending (pid)) | |
833 | return; | |
834 | #endif | |
8607ea63 JB |
835 | |
836 | if (debug_fbsd_lwp) | |
837 | fprintf_unfiltered (gdb_stdlog, | |
838 | "FLWP: fbsd_resume for ptid (%d, %ld, %ld)\n", | |
839 | ptid_get_pid (ptid), ptid_get_lwp (ptid), | |
840 | ptid_get_tid (ptid)); | |
841 | if (ptid_lwp_p (ptid)) | |
842 | { | |
843 | /* If ptid is a specific LWP, suspend all other LWPs in the process. */ | |
d56060f0 JB |
844 | struct thread_info *tp; |
845 | int request; | |
846 | ||
847 | ALL_NON_EXITED_THREADS (tp) | |
848 | { | |
849 | if (ptid_get_pid (tp->ptid) != ptid_get_pid (ptid)) | |
850 | continue; | |
851 | ||
852 | if (ptid_get_lwp (tp->ptid) == ptid_get_lwp (ptid)) | |
853 | request = PT_RESUME; | |
854 | else | |
855 | request = PT_SUSPEND; | |
856 | ||
857 | if (ptrace (request, ptid_get_lwp (tp->ptid), NULL, 0) == -1) | |
858 | perror_with_name (("ptrace")); | |
859 | } | |
8607ea63 JB |
860 | } |
861 | else | |
862 | { | |
863 | /* If ptid is a wildcard, resume all matching threads (they won't run | |
864 | until the process is continued however). */ | |
d56060f0 JB |
865 | struct thread_info *tp; |
866 | ||
867 | ALL_NON_EXITED_THREADS (tp) | |
868 | { | |
869 | if (!ptid_match (tp->ptid, ptid)) | |
870 | continue; | |
871 | ||
872 | if (ptrace (PT_RESUME, ptid_get_lwp (tp->ptid), NULL, 0) == -1) | |
873 | perror_with_name (("ptrace")); | |
874 | } | |
8607ea63 JB |
875 | ptid = inferior_ptid; |
876 | } | |
877 | super_resume (ops, ptid, step, signo); | |
878 | } | |
879 | ||
e58e05d6 JB |
880 | /* Wait for the child specified by PTID to do something. Return the |
881 | process ID of the child, or MINUS_ONE_PTID in case of error; store | |
882 | the status in *OURSTATUS. */ | |
883 | ||
884 | static ptid_t | |
885 | fbsd_wait (struct target_ops *ops, | |
886 | ptid_t ptid, struct target_waitstatus *ourstatus, | |
887 | int target_options) | |
888 | { | |
889 | ptid_t wptid; | |
890 | ||
891 | while (1) | |
892 | { | |
dbaed385 | 893 | #ifndef PTRACE_VFORK |
2c5c2a33 JB |
894 | wptid = fbsd_next_vfork_done (); |
895 | if (!ptid_equal (wptid, null_ptid)) | |
896 | { | |
897 | ourstatus->kind = TARGET_WAITKIND_VFORK_DONE; | |
898 | return wptid; | |
899 | } | |
dbaed385 | 900 | #endif |
e58e05d6 JB |
901 | wptid = super_wait (ops, ptid, ourstatus, target_options); |
902 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED) | |
903 | { | |
904 | struct ptrace_lwpinfo pl; | |
905 | pid_t pid; | |
906 | int status; | |
907 | ||
908 | pid = ptid_get_pid (wptid); | |
6e9567fe | 909 | if (ptrace (PT_LWPINFO, pid, (caddr_t) &pl, sizeof pl) == -1) |
e58e05d6 JB |
910 | perror_with_name (("ptrace")); |
911 | ||
6e9567fe JB |
912 | wptid = ptid_build (pid, pl.pl_lwpid, 0); |
913 | ||
914 | #ifdef PT_LWP_EVENTS | |
915 | if (pl.pl_flags & PL_FLAG_EXITED) | |
916 | { | |
917 | /* If GDB attaches to a multi-threaded process, exiting | |
918 | threads might be skipped during fbsd_post_attach that | |
919 | have not yet reported their PL_FLAG_EXITED event. | |
920 | Ignore EXITED events for an unknown LWP. */ | |
921 | if (in_thread_list (wptid)) | |
922 | { | |
923 | if (debug_fbsd_lwp) | |
924 | fprintf_unfiltered (gdb_stdlog, | |
925 | "FLWP: deleting thread for LWP %u\n", | |
926 | pl.pl_lwpid); | |
927 | if (print_thread_events) | |
928 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str | |
929 | (wptid)); | |
930 | delete_thread (wptid); | |
931 | } | |
932 | if (ptrace (PT_CONTINUE, pid, (caddr_t) 1, 0) == -1) | |
933 | perror_with_name (("ptrace")); | |
934 | continue; | |
935 | } | |
936 | #endif | |
937 | ||
938 | /* Switch to an LWP PTID on the first stop in a new process. | |
939 | This is done after handling PL_FLAG_EXITED to avoid | |
940 | switching to an exited LWP. It is done before checking | |
941 | PL_FLAG_BORN in case the first stop reported after | |
942 | attaching to an existing process is a PL_FLAG_BORN | |
943 | event. */ | |
944 | if (in_thread_list (pid_to_ptid (pid))) | |
945 | { | |
946 | if (debug_fbsd_lwp) | |
947 | fprintf_unfiltered (gdb_stdlog, | |
948 | "FLWP: using LWP %u for first thread\n", | |
949 | pl.pl_lwpid); | |
950 | thread_change_ptid (pid_to_ptid (pid), wptid); | |
951 | } | |
952 | ||
953 | #ifdef PT_LWP_EVENTS | |
954 | if (pl.pl_flags & PL_FLAG_BORN) | |
955 | { | |
956 | /* If GDB attaches to a multi-threaded process, newborn | |
957 | threads might be added by fbsd_add_threads that have | |
958 | not yet reported their PL_FLAG_BORN event. Ignore | |
959 | BORN events for an already-known LWP. */ | |
960 | if (!in_thread_list (wptid)) | |
961 | { | |
962 | if (debug_fbsd_lwp) | |
963 | fprintf_unfiltered (gdb_stdlog, | |
964 | "FLWP: adding thread for LWP %u\n", | |
965 | pl.pl_lwpid); | |
966 | add_thread (wptid); | |
967 | } | |
968 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
969 | return wptid; | |
970 | } | |
971 | #endif | |
972 | ||
e58e05d6 JB |
973 | #ifdef TDP_RFPPWAIT |
974 | if (pl.pl_flags & PL_FLAG_FORKED) | |
975 | { | |
dbaed385 | 976 | #ifndef PTRACE_VFORK |
e58e05d6 | 977 | struct kinfo_proc kp; |
dbaed385 | 978 | #endif |
6e9567fe | 979 | ptid_t child_ptid; |
e58e05d6 JB |
980 | pid_t child; |
981 | ||
982 | child = pl.pl_child_pid; | |
983 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
dbaed385 JB |
984 | #ifdef PTRACE_VFORK |
985 | if (pl.pl_flags & PL_FLAG_VFORKED) | |
986 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
987 | #endif | |
e58e05d6 JB |
988 | |
989 | /* Make sure the other end of the fork is stopped too. */ | |
6e9567fe JB |
990 | child_ptid = fbsd_is_child_pending (child); |
991 | if (ptid_equal (child_ptid, null_ptid)) | |
e58e05d6 JB |
992 | { |
993 | pid = waitpid (child, &status, 0); | |
994 | if (pid == -1) | |
995 | perror_with_name (("waitpid")); | |
996 | ||
997 | gdb_assert (pid == child); | |
998 | ||
999 | if (ptrace (PT_LWPINFO, child, (caddr_t)&pl, sizeof pl) == -1) | |
1000 | perror_with_name (("ptrace")); | |
1001 | ||
1002 | gdb_assert (pl.pl_flags & PL_FLAG_CHILD); | |
6e9567fe | 1003 | child_ptid = ptid_build (child, pl.pl_lwpid, 0); |
e58e05d6 JB |
1004 | } |
1005 | ||
5fa14c6b JB |
1006 | /* Enable additional events on the child process. */ |
1007 | fbsd_enable_proc_events (ptid_get_pid (child_ptid)); | |
1008 | ||
dbaed385 | 1009 | #ifndef PTRACE_VFORK |
e58e05d6 JB |
1010 | /* For vfork, the child process will have the P_PPWAIT |
1011 | flag set. */ | |
1012 | fbsd_fetch_kinfo_proc (child, &kp); | |
1013 | if (kp.ki_flag & P_PPWAIT) | |
1014 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
dbaed385 | 1015 | #endif |
6e9567fe | 1016 | ourstatus->value.related_pid = child_ptid; |
e58e05d6 JB |
1017 | |
1018 | return wptid; | |
1019 | } | |
1020 | ||
1021 | if (pl.pl_flags & PL_FLAG_CHILD) | |
1022 | { | |
1023 | /* Remember that this child forked, but do not report it | |
1024 | until the parent reports its corresponding fork | |
1025 | event. */ | |
6e9567fe | 1026 | fbsd_remember_child (wptid); |
e58e05d6 JB |
1027 | continue; |
1028 | } | |
dbaed385 JB |
1029 | |
1030 | #ifdef PTRACE_VFORK | |
1031 | if (pl.pl_flags & PL_FLAG_VFORK_DONE) | |
1032 | { | |
1033 | ourstatus->kind = TARGET_WAITKIND_VFORK_DONE; | |
1034 | return wptid; | |
1035 | } | |
1036 | #endif | |
e58e05d6 | 1037 | #endif |
d2b41ca0 JB |
1038 | |
1039 | #ifdef PL_FLAG_EXEC | |
1040 | if (pl.pl_flags & PL_FLAG_EXEC) | |
1041 | { | |
1042 | ourstatus->kind = TARGET_WAITKIND_EXECD; | |
1043 | ourstatus->value.execd_pathname | |
1044 | = xstrdup (fbsd_pid_to_exec_file (NULL, pid)); | |
1045 | return wptid; | |
1046 | } | |
1047 | #endif | |
e6cdd38e JB |
1048 | |
1049 | /* Note that PL_FLAG_SCE is set for any event reported while | |
1050 | a thread is executing a system call in the kernel. In | |
1051 | particular, signals that interrupt a sleep in a system | |
1052 | call will report this flag as part of their event. Stops | |
1053 | explicitly for system call entry and exit always use | |
1054 | SIGTRAP, so only treat SIGTRAP events as system call | |
1055 | entry/exit events. */ | |
1056 | if (pl.pl_flags & (PL_FLAG_SCE | PL_FLAG_SCX) | |
1057 | && ourstatus->value.sig == SIGTRAP) | |
1058 | { | |
1059 | #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE | |
1060 | if (catch_syscall_enabled ()) | |
1061 | { | |
1062 | if (catching_syscall_number (pl.pl_syscall_code)) | |
1063 | { | |
1064 | if (pl.pl_flags & PL_FLAG_SCE) | |
1065 | ourstatus->kind = TARGET_WAITKIND_SYSCALL_ENTRY; | |
1066 | else | |
1067 | ourstatus->kind = TARGET_WAITKIND_SYSCALL_RETURN; | |
1068 | ourstatus->value.syscall_number = pl.pl_syscall_code; | |
1069 | return wptid; | |
1070 | } | |
1071 | } | |
1072 | #endif | |
1073 | /* If the core isn't interested in this event, just | |
1074 | continue the process explicitly and wait for another | |
1075 | event. Note that PT_SYSCALL is "sticky" on FreeBSD | |
1076 | and once system call stops are enabled on a process | |
1077 | it stops for all system call entries and exits. */ | |
1078 | if (ptrace (PT_CONTINUE, pid, (caddr_t) 1, 0) == -1) | |
1079 | perror_with_name (("ptrace")); | |
1080 | continue; | |
1081 | } | |
e58e05d6 JB |
1082 | } |
1083 | return wptid; | |
1084 | } | |
1085 | } | |
1086 | ||
1087 | #ifdef TDP_RFPPWAIT | |
1088 | /* Target hook for follow_fork. On entry and at return inferior_ptid is | |
1089 | the ptid of the followed inferior. */ | |
1090 | ||
1091 | static int | |
1092 | fbsd_follow_fork (struct target_ops *ops, int follow_child, | |
1093 | int detach_fork) | |
1094 | { | |
bb2a62e6 | 1095 | if (!follow_child && detach_fork) |
e58e05d6 JB |
1096 | { |
1097 | struct thread_info *tp = inferior_thread (); | |
1098 | pid_t child_pid = ptid_get_pid (tp->pending_follow.value.related_pid); | |
1099 | ||
1100 | /* Breakpoints have already been detached from the child by | |
1101 | infrun.c. */ | |
1102 | ||
1103 | if (ptrace (PT_DETACH, child_pid, (PTRACE_TYPE_ARG3)1, 0) == -1) | |
1104 | perror_with_name (("ptrace")); | |
2c5c2a33 | 1105 | |
dbaed385 JB |
1106 | #ifndef PTRACE_VFORK |
1107 | if (tp->pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
2c5c2a33 JB |
1108 | { |
1109 | /* We can't insert breakpoints until the child process has | |
1110 | finished with the shared memory region. The parent | |
1111 | process doesn't wait for the child process to exit or | |
1112 | exec until after it has been resumed from the ptrace stop | |
1113 | to report the fork. Once it has been resumed it doesn't | |
1114 | stop again before returning to userland, so there is no | |
1115 | reliable way to wait on the parent. | |
1116 | ||
1117 | We can't stay attached to the child to wait for an exec | |
1118 | or exit because it may invoke ptrace(PT_TRACE_ME) | |
1119 | (e.g. if the parent process is a debugger forking a new | |
1120 | child process). | |
1121 | ||
1122 | In the end, the best we can do is to make sure it runs | |
1123 | for a little while. Hopefully it will be out of range of | |
1124 | any breakpoints we reinsert. Usually this is only the | |
1125 | single-step breakpoint at vfork's return point. */ | |
1126 | ||
1127 | usleep (10000); | |
1128 | ||
1129 | /* Schedule a fake VFORK_DONE event to report on the next | |
1130 | wait. */ | |
1131 | fbsd_add_vfork_done (inferior_ptid); | |
1132 | } | |
dbaed385 | 1133 | #endif |
e58e05d6 JB |
1134 | } |
1135 | ||
1136 | return 0; | |
1137 | } | |
1138 | ||
1139 | static int | |
1140 | fbsd_insert_fork_catchpoint (struct target_ops *self, int pid) | |
1141 | { | |
1142 | return 0; | |
1143 | } | |
1144 | ||
1145 | static int | |
1146 | fbsd_remove_fork_catchpoint (struct target_ops *self, int pid) | |
1147 | { | |
1148 | return 0; | |
1149 | } | |
1150 | ||
1151 | static int | |
1152 | fbsd_insert_vfork_catchpoint (struct target_ops *self, int pid) | |
1153 | { | |
1154 | return 0; | |
1155 | } | |
1156 | ||
1157 | static int | |
1158 | fbsd_remove_vfork_catchpoint (struct target_ops *self, int pid) | |
1159 | { | |
1160 | return 0; | |
1161 | } | |
6e9567fe | 1162 | #endif |
e58e05d6 JB |
1163 | |
1164 | /* Implement the "to_post_startup_inferior" target_ops method. */ | |
1165 | ||
1166 | static void | |
1167 | fbsd_post_startup_inferior (struct target_ops *self, ptid_t pid) | |
1168 | { | |
da95a26c | 1169 | fbsd_enable_proc_events (ptid_get_pid (pid)); |
e58e05d6 JB |
1170 | } |
1171 | ||
1172 | /* Implement the "to_post_attach" target_ops method. */ | |
1173 | ||
1174 | static void | |
1175 | fbsd_post_attach (struct target_ops *self, int pid) | |
1176 | { | |
da95a26c | 1177 | fbsd_enable_proc_events (pid); |
6e9567fe JB |
1178 | fbsd_add_threads (pid); |
1179 | } | |
d2b41ca0 JB |
1180 | |
1181 | #ifdef PL_FLAG_EXEC | |
1182 | /* If the FreeBSD kernel supports PL_FLAG_EXEC, then traced processes | |
1183 | will always stop after exec. */ | |
1184 | ||
1185 | static int | |
1186 | fbsd_insert_exec_catchpoint (struct target_ops *self, int pid) | |
1187 | { | |
1188 | return 0; | |
1189 | } | |
1190 | ||
1191 | static int | |
1192 | fbsd_remove_exec_catchpoint (struct target_ops *self, int pid) | |
1193 | { | |
1194 | return 0; | |
1195 | } | |
1196 | #endif | |
e6cdd38e JB |
1197 | |
1198 | #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE | |
1199 | static int | |
1200 | fbsd_set_syscall_catchpoint (struct target_ops *self, int pid, int needed, | |
1201 | int any_count, int table_size, int *table) | |
1202 | { | |
1203 | ||
1204 | /* Ignore the arguments. inf-ptrace.c will use PT_SYSCALL which | |
1205 | will catch all system call entries and exits. The system calls | |
1206 | are filtered by GDB rather than the kernel. */ | |
1207 | return 0; | |
1208 | } | |
1209 | #endif | |
e58e05d6 JB |
1210 | #endif |
1211 | ||
8f60fe01 JB |
1212 | void |
1213 | fbsd_nat_add_target (struct target_ops *t) | |
1214 | { | |
1215 | t->to_pid_to_exec_file = fbsd_pid_to_exec_file; | |
1216 | t->to_find_memory_regions = fbsd_find_memory_regions; | |
7697fc9e JB |
1217 | #ifdef KERN_PROC_AUXV |
1218 | super_xfer_partial = t->to_xfer_partial; | |
1219 | t->to_xfer_partial = fbsd_xfer_partial; | |
1220 | #endif | |
e58e05d6 | 1221 | #ifdef PT_LWPINFO |
6e9567fe JB |
1222 | t->to_thread_alive = fbsd_thread_alive; |
1223 | t->to_pid_to_str = fbsd_pid_to_str; | |
1224 | #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME | |
1225 | t->to_thread_name = fbsd_thread_name; | |
1226 | #endif | |
1227 | t->to_update_thread_list = fbsd_update_thread_list; | |
1228 | t->to_has_thread_control = tc_schedlock; | |
1229 | super_resume = t->to_resume; | |
1230 | t->to_resume = fbsd_resume; | |
e58e05d6 JB |
1231 | super_wait = t->to_wait; |
1232 | t->to_wait = fbsd_wait; | |
6e9567fe JB |
1233 | t->to_post_startup_inferior = fbsd_post_startup_inferior; |
1234 | t->to_post_attach = fbsd_post_attach; | |
e58e05d6 JB |
1235 | #ifdef TDP_RFPPWAIT |
1236 | t->to_follow_fork = fbsd_follow_fork; | |
1237 | t->to_insert_fork_catchpoint = fbsd_insert_fork_catchpoint; | |
1238 | t->to_remove_fork_catchpoint = fbsd_remove_fork_catchpoint; | |
1239 | t->to_insert_vfork_catchpoint = fbsd_insert_vfork_catchpoint; | |
1240 | t->to_remove_vfork_catchpoint = fbsd_remove_vfork_catchpoint; | |
e58e05d6 | 1241 | #endif |
d2b41ca0 JB |
1242 | #ifdef PL_FLAG_EXEC |
1243 | t->to_insert_exec_catchpoint = fbsd_insert_exec_catchpoint; | |
1244 | t->to_remove_exec_catchpoint = fbsd_remove_exec_catchpoint; | |
1245 | #endif | |
e6cdd38e JB |
1246 | #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE |
1247 | t->to_set_syscall_catchpoint = fbsd_set_syscall_catchpoint; | |
1248 | #endif | |
e58e05d6 | 1249 | #endif |
8f60fe01 JB |
1250 | add_target (t); |
1251 | } | |
6e9567fe JB |
1252 | |
1253 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
1254 | extern initialize_file_ftype _initialize_fbsd_nat; | |
1255 | ||
1256 | void | |
1257 | _initialize_fbsd_nat (void) | |
1258 | { | |
1259 | #ifdef PT_LWPINFO | |
1260 | add_setshow_boolean_cmd ("fbsd-lwp", class_maintenance, | |
1261 | &debug_fbsd_lwp, _("\ | |
1262 | Set debugging of FreeBSD lwp module."), _("\ | |
1263 | Show debugging of FreeBSD lwp module."), _("\ | |
1264 | Enables printf debugging output."), | |
1265 | NULL, | |
1266 | &show_fbsd_lwp_debug, | |
1267 | &setdebuglist, &showdebuglist); | |
1268 | #endif | |
1269 | } |