Commit | Line | Data |
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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" | |
e4a26669 | 21 | #include "byte-vector.h" |
578c1c03 MK |
22 | #include "gdbcore.h" |
23 | #include "inferior.h" | |
24 | #include "regcache.h" | |
25 | #include "regset.h" | |
6e9567fe | 26 | #include "gdbcmd.h" |
2020b7ab | 27 | #include "gdbthread.h" |
cea6e4f1 | 28 | #include "gdb_wait.h" |
578c1c03 | 29 | #include <sys/types.h> |
68b9939a | 30 | #include <sys/procfs.h> |
e58e05d6 | 31 | #include <sys/ptrace.h> |
929edea9 | 32 | #include <sys/signal.h> |
68b9939a | 33 | #include <sys/sysctl.h> |
25268153 | 34 | #include <sys/user.h> |
142311d3 | 35 | #ifdef HAVE_KINFO_GETVMMAP |
25268153 | 36 | #include <libutil.h> |
142311d3 JB |
37 | #else |
38 | #include "filestuff.h" | |
25268153 | 39 | #endif |
578c1c03 MK |
40 | |
41 | #include "elf-bfd.h" | |
42 | #include "fbsd-nat.h" | |
43 | ||
766062f6 | 44 | /* Return the name of a file that can be opened to get the symbols for |
578c1c03 MK |
45 | the child process identified by PID. */ |
46 | ||
8f60fe01 | 47 | static char * |
8dd27370 | 48 | fbsd_pid_to_exec_file (struct target_ops *self, int pid) |
578c1c03 | 49 | { |
f2feec98 | 50 | ssize_t len; |
b4ab256d HZ |
51 | static char buf[PATH_MAX]; |
52 | char name[PATH_MAX]; | |
578c1c03 | 53 | |
68b9939a | 54 | #ifdef KERN_PROC_PATHNAME |
f2feec98 | 55 | size_t buflen; |
68b9939a | 56 | int mib[4]; |
578c1c03 | 57 | |
68b9939a MK |
58 | mib[0] = CTL_KERN; |
59 | mib[1] = KERN_PROC; | |
60 | mib[2] = KERN_PROC_PATHNAME; | |
61 | mib[3] = pid; | |
f2feec98 JB |
62 | buflen = sizeof buf; |
63 | if (sysctl (mib, 4, buf, &buflen, NULL, 0) == 0) | |
578c1c03 | 64 | return buf; |
68b9939a | 65 | #endif |
578c1c03 | 66 | |
b4ab256d HZ |
67 | xsnprintf (name, PATH_MAX, "/proc/%d/exe", pid); |
68 | len = readlink (name, buf, PATH_MAX - 1); | |
69 | if (len != -1) | |
68b9939a | 70 | { |
b4ab256d HZ |
71 | buf[len] = '\0'; |
72 | return buf; | |
68b9939a MK |
73 | } |
74 | ||
b4ab256d | 75 | return NULL; |
578c1c03 MK |
76 | } |
77 | ||
25268153 | 78 | #ifdef HAVE_KINFO_GETVMMAP |
e4a26669 JB |
79 | /* Deleter for std::unique_ptr that invokes free. */ |
80 | ||
81 | template <typename T> | |
82 | struct free_deleter | |
83 | { | |
84 | void operator() (T *ptr) const { free (ptr); } | |
85 | }; | |
86 | ||
25268153 JB |
87 | /* Iterate over all the memory regions in the current inferior, |
88 | calling FUNC for each memory region. OBFD is passed as the last | |
89 | argument to FUNC. */ | |
90 | ||
8f60fe01 | 91 | static int |
25268153 JB |
92 | fbsd_find_memory_regions (struct target_ops *self, |
93 | find_memory_region_ftype func, void *obfd) | |
94 | { | |
95 | pid_t pid = ptid_get_pid (inferior_ptid); | |
e4a26669 | 96 | struct kinfo_vmentry *kve; |
25268153 | 97 | uint64_t size; |
25268153 JB |
98 | int i, nitems; |
99 | ||
e4a26669 JB |
100 | std::unique_ptr<struct kinfo_vmentry, free_deleter<struct kinfo_vmentry>> |
101 | vmentl (kinfo_getvmmap (pid, &nitems)); | |
25268153 JB |
102 | if (vmentl == NULL) |
103 | perror_with_name (_("Couldn't fetch VM map entries.")); | |
25268153 | 104 | |
e4a26669 | 105 | for (i = 0, kve = vmentl.get (); i < nitems; i++, kve++) |
25268153 | 106 | { |
25268153 JB |
107 | /* Skip unreadable segments and those where MAP_NOCORE has been set. */ |
108 | if (!(kve->kve_protection & KVME_PROT_READ) | |
109 | || kve->kve_flags & KVME_FLAG_NOCOREDUMP) | |
110 | continue; | |
111 | ||
112 | /* Skip segments with an invalid type. */ | |
113 | if (kve->kve_type != KVME_TYPE_DEFAULT | |
114 | && kve->kve_type != KVME_TYPE_VNODE | |
115 | && kve->kve_type != KVME_TYPE_SWAP | |
116 | && kve->kve_type != KVME_TYPE_PHYS) | |
117 | continue; | |
118 | ||
119 | size = kve->kve_end - kve->kve_start; | |
120 | if (info_verbose) | |
121 | { | |
122 | fprintf_filtered (gdb_stdout, | |
123 | "Save segment, %ld bytes at %s (%c%c%c)\n", | |
124 | (long) size, | |
125 | paddress (target_gdbarch (), kve->kve_start), | |
126 | kve->kve_protection & KVME_PROT_READ ? 'r' : '-', | |
127 | kve->kve_protection & KVME_PROT_WRITE ? 'w' : '-', | |
128 | kve->kve_protection & KVME_PROT_EXEC ? 'x' : '-'); | |
129 | } | |
130 | ||
131 | /* Invoke the callback function to create the corefile segment. | |
132 | Pass MODIFIED as true, we do not know the real modification state. */ | |
133 | func (kve->kve_start, size, kve->kve_protection & KVME_PROT_READ, | |
134 | kve->kve_protection & KVME_PROT_WRITE, | |
135 | kve->kve_protection & KVME_PROT_EXEC, 1, obfd); | |
136 | } | |
25268153 JB |
137 | return 0; |
138 | } | |
139 | #else | |
578c1c03 MK |
140 | static int |
141 | fbsd_read_mapping (FILE *mapfile, unsigned long *start, unsigned long *end, | |
142 | char *protection) | |
143 | { | |
144 | /* FreeBSD 5.1-RELEASE uses a 256-byte buffer. */ | |
145 | char buf[256]; | |
146 | int resident, privateresident; | |
147 | unsigned long obj; | |
148 | int ret = EOF; | |
149 | ||
150 | /* As of FreeBSD 5.0-RELEASE, the layout is described in | |
151 | /usr/src/sys/fs/procfs/procfs_map.c. Somewhere in 5.1-CURRENT a | |
152 | new column was added to the procfs map. Therefore we can't use | |
153 | fscanf since we need to support older releases too. */ | |
154 | if (fgets (buf, sizeof buf, mapfile) != NULL) | |
155 | ret = sscanf (buf, "%lx %lx %d %d %lx %s", start, end, | |
156 | &resident, &privateresident, &obj, protection); | |
157 | ||
158 | return (ret != 0 && ret != EOF); | |
159 | } | |
160 | ||
161 | /* Iterate over all the memory regions in the current inferior, | |
162 | calling FUNC for each memory region. OBFD is passed as the last | |
163 | argument to FUNC. */ | |
164 | ||
8f60fe01 | 165 | static int |
2e73927c TT |
166 | fbsd_find_memory_regions (struct target_ops *self, |
167 | find_memory_region_ftype func, void *obfd) | |
578c1c03 MK |
168 | { |
169 | pid_t pid = ptid_get_pid (inferior_ptid); | |
578c1c03 MK |
170 | unsigned long start, end, size; |
171 | char protection[4]; | |
172 | int read, write, exec; | |
173 | ||
e4a26669 JB |
174 | std::string mapfilename = string_printf ("/proc/%ld/map", (long) pid); |
175 | gdb_file_up mapfile (fopen (mapfilename.c_str (), "r")); | |
578c1c03 | 176 | if (mapfile == NULL) |
e4a26669 | 177 | error (_("Couldn't open %s."), mapfilename.c_str ()); |
578c1c03 MK |
178 | |
179 | if (info_verbose) | |
180 | fprintf_filtered (gdb_stdout, | |
e4a26669 | 181 | "Reading memory regions from %s\n", mapfilename.c_str ()); |
578c1c03 MK |
182 | |
183 | /* Now iterate until end-of-file. */ | |
7cd06d6e | 184 | while (fbsd_read_mapping (mapfile.get (), &start, &end, &protection[0])) |
578c1c03 MK |
185 | { |
186 | size = end - start; | |
187 | ||
188 | read = (strchr (protection, 'r') != 0); | |
189 | write = (strchr (protection, 'w') != 0); | |
190 | exec = (strchr (protection, 'x') != 0); | |
191 | ||
192 | if (info_verbose) | |
193 | { | |
194 | fprintf_filtered (gdb_stdout, | |
5af949e3 | 195 | "Save segment, %ld bytes at %s (%c%c%c)\n", |
f5656ead | 196 | size, paddress (target_gdbarch (), start), |
578c1c03 MK |
197 | read ? 'r' : '-', |
198 | write ? 'w' : '-', | |
199 | exec ? 'x' : '-'); | |
200 | } | |
201 | ||
4f69f4c2 JK |
202 | /* Invoke the callback function to create the corefile segment. |
203 | Pass MODIFIED as true, we do not know the real modification state. */ | |
204 | func (start, size, read, write, exec, 1, obfd); | |
578c1c03 MK |
205 | } |
206 | ||
578c1c03 MK |
207 | return 0; |
208 | } | |
25268153 | 209 | #endif |
8f60fe01 | 210 | |
7697fc9e JB |
211 | #ifdef KERN_PROC_AUXV |
212 | static enum target_xfer_status (*super_xfer_partial) (struct target_ops *ops, | |
213 | enum target_object object, | |
214 | const char *annex, | |
215 | gdb_byte *readbuf, | |
216 | const gdb_byte *writebuf, | |
217 | ULONGEST offset, | |
218 | ULONGEST len, | |
219 | ULONGEST *xfered_len); | |
220 | ||
929edea9 JB |
221 | #ifdef PT_LWPINFO |
222 | /* Return the size of siginfo for the current inferior. */ | |
223 | ||
224 | #ifdef __LP64__ | |
225 | union sigval32 { | |
226 | int sival_int; | |
227 | uint32_t sival_ptr; | |
228 | }; | |
229 | ||
230 | /* This structure matches the naming and layout of `siginfo_t' in | |
231 | <sys/signal.h>. In particular, the `si_foo' macros defined in that | |
232 | header can be used with both types to copy fields in the `_reason' | |
233 | union. */ | |
234 | ||
235 | struct siginfo32 | |
236 | { | |
237 | int si_signo; | |
238 | int si_errno; | |
239 | int si_code; | |
240 | __pid_t si_pid; | |
241 | __uid_t si_uid; | |
242 | int si_status; | |
243 | uint32_t si_addr; | |
244 | union sigval32 si_value; | |
245 | union | |
246 | { | |
247 | struct | |
248 | { | |
249 | int _trapno; | |
250 | } _fault; | |
251 | struct | |
252 | { | |
253 | int _timerid; | |
254 | int _overrun; | |
255 | } _timer; | |
256 | struct | |
257 | { | |
258 | int _mqd; | |
259 | } _mesgq; | |
260 | struct | |
261 | { | |
262 | int32_t _band; | |
263 | } _poll; | |
264 | struct | |
265 | { | |
266 | int32_t __spare1__; | |
267 | int __spare2__[7]; | |
268 | } __spare__; | |
269 | } _reason; | |
270 | }; | |
271 | #endif | |
272 | ||
273 | static size_t | |
274 | fbsd_siginfo_size () | |
275 | { | |
276 | #ifdef __LP64__ | |
277 | struct gdbarch *gdbarch = get_frame_arch (get_current_frame ()); | |
278 | ||
279 | /* Is the inferior 32-bit? If so, use the 32-bit siginfo size. */ | |
280 | if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) | |
281 | return sizeof (struct siginfo32); | |
282 | #endif | |
283 | return sizeof (siginfo_t); | |
284 | } | |
285 | ||
286 | /* Convert a native 64-bit siginfo object to a 32-bit object. Note | |
287 | that FreeBSD doesn't support writing to $_siginfo, so this only | |
288 | needs to convert one way. */ | |
289 | ||
290 | static void | |
291 | fbsd_convert_siginfo (siginfo_t *si) | |
292 | { | |
293 | #ifdef __LP64__ | |
294 | struct gdbarch *gdbarch = get_frame_arch (get_current_frame ()); | |
295 | ||
296 | /* Is the inferior 32-bit? If not, nothing to do. */ | |
297 | if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word != 32) | |
298 | return; | |
299 | ||
300 | struct siginfo32 si32; | |
301 | ||
302 | si32.si_signo = si->si_signo; | |
303 | si32.si_errno = si->si_errno; | |
304 | si32.si_code = si->si_code; | |
305 | si32.si_pid = si->si_pid; | |
306 | si32.si_uid = si->si_uid; | |
307 | si32.si_status = si->si_status; | |
308 | si32.si_addr = (uintptr_t) si->si_addr; | |
309 | ||
310 | /* If sival_ptr is being used instead of sival_int on a big-endian | |
311 | platform, then sival_int will be zero since it holds the upper | |
312 | 32-bits of the pointer value. */ | |
313 | #if _BYTE_ORDER == _BIG_ENDIAN | |
314 | if (si->si_value.sival_int == 0) | |
315 | si32->si_value.sival_ptr = (uintptr_t) si->si_value.sival_ptr; | |
316 | else | |
317 | si32.si_value.sival_int = si->si_value.sival_int; | |
318 | #else | |
319 | si32.si_value.sival_int = si->si_value.sival_int; | |
320 | #endif | |
321 | ||
322 | /* Always copy the spare fields and then possibly overwrite them for | |
323 | signal-specific or code-specific fields. */ | |
324 | si32._reason.__spare__.__spare1__ = si->_reason.__spare__.__spare1__; | |
325 | for (int i = 0; i < 7; i++) | |
326 | si32._reason.__spare__.__spare2__[i] = si->_reason.__spare__.__spare2__[i]; | |
327 | switch (si->si_signo) { | |
328 | case SIGILL: | |
329 | case SIGFPE: | |
330 | case SIGSEGV: | |
331 | case SIGBUS: | |
332 | si32.si_trapno = si->si_trapno; | |
333 | break; | |
334 | } | |
335 | switch (si->si_code) { | |
336 | case SI_TIMER: | |
337 | si32.si_timerid = si->si_timerid; | |
338 | si32.si_overrun = si->si_overrun; | |
339 | break; | |
340 | case SI_MESGQ: | |
341 | si32.si_mqd = si->si_mqd; | |
342 | break; | |
343 | } | |
344 | ||
345 | memcpy(si, &si32, sizeof (si32)); | |
346 | #endif | |
347 | } | |
348 | #endif | |
349 | ||
7697fc9e JB |
350 | /* Implement the "to_xfer_partial target_ops" method. */ |
351 | ||
352 | static enum target_xfer_status | |
353 | fbsd_xfer_partial (struct target_ops *ops, enum target_object object, | |
354 | const char *annex, gdb_byte *readbuf, | |
355 | const gdb_byte *writebuf, | |
356 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) | |
357 | { | |
358 | pid_t pid = ptid_get_pid (inferior_ptid); | |
359 | ||
360 | switch (object) | |
361 | { | |
929edea9 JB |
362 | #ifdef PT_LWPINFO |
363 | case TARGET_OBJECT_SIGNAL_INFO: | |
364 | { | |
365 | struct ptrace_lwpinfo pl; | |
366 | size_t siginfo_size; | |
367 | ||
368 | /* FreeBSD doesn't support writing to $_siginfo. */ | |
369 | if (writebuf != NULL) | |
370 | return TARGET_XFER_E_IO; | |
371 | ||
372 | if (inferior_ptid.lwp_p ()) | |
373 | pid = inferior_ptid.lwp (); | |
374 | ||
375 | siginfo_size = fbsd_siginfo_size (); | |
376 | if (offset > siginfo_size) | |
377 | return TARGET_XFER_E_IO; | |
378 | ||
379 | if (ptrace (PT_LWPINFO, pid, (PTRACE_TYPE_ARG3) &pl, sizeof (pl)) == -1) | |
380 | return TARGET_XFER_E_IO; | |
381 | ||
382 | if (!(pl.pl_flags & PL_FLAG_SI)) | |
383 | return TARGET_XFER_E_IO; | |
384 | ||
385 | fbsd_convert_siginfo (&pl.pl_siginfo); | |
386 | if (offset + len > siginfo_size) | |
387 | len = siginfo_size - offset; | |
388 | ||
389 | memcpy (readbuf, ((gdb_byte *) &pl.pl_siginfo) + offset, len); | |
390 | *xfered_len = len; | |
391 | return TARGET_XFER_OK; | |
392 | } | |
393 | #endif | |
7697fc9e JB |
394 | case TARGET_OBJECT_AUXV: |
395 | { | |
e4a26669 JB |
396 | gdb::byte_vector buf_storage; |
397 | gdb_byte *buf; | |
7697fc9e JB |
398 | size_t buflen; |
399 | int mib[4]; | |
400 | ||
401 | if (writebuf != NULL) | |
402 | return TARGET_XFER_E_IO; | |
403 | mib[0] = CTL_KERN; | |
404 | mib[1] = KERN_PROC; | |
405 | mib[2] = KERN_PROC_AUXV; | |
406 | mib[3] = pid; | |
407 | if (offset == 0) | |
408 | { | |
409 | buf = readbuf; | |
410 | buflen = len; | |
411 | } | |
412 | else | |
413 | { | |
414 | buflen = offset + len; | |
e4a26669 JB |
415 | buf_storage.resize (buflen); |
416 | buf = buf_storage.data (); | |
7697fc9e JB |
417 | } |
418 | if (sysctl (mib, 4, buf, &buflen, NULL, 0) == 0) | |
419 | { | |
420 | if (offset != 0) | |
421 | { | |
422 | if (buflen > offset) | |
423 | { | |
424 | buflen -= offset; | |
425 | memcpy (readbuf, buf + offset, buflen); | |
426 | } | |
427 | else | |
428 | buflen = 0; | |
429 | } | |
7697fc9e JB |
430 | *xfered_len = buflen; |
431 | return (buflen == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; | |
432 | } | |
7697fc9e JB |
433 | return TARGET_XFER_E_IO; |
434 | } | |
435 | default: | |
436 | return super_xfer_partial (ops, object, annex, readbuf, writebuf, offset, | |
437 | len, xfered_len); | |
438 | } | |
439 | } | |
440 | #endif | |
441 | ||
e58e05d6 | 442 | #ifdef PT_LWPINFO |
6e9567fe JB |
443 | static int debug_fbsd_lwp; |
444 | ||
8607ea63 JB |
445 | static void (*super_resume) (struct target_ops *, |
446 | ptid_t, | |
447 | int, | |
448 | enum gdb_signal); | |
e58e05d6 JB |
449 | static ptid_t (*super_wait) (struct target_ops *, |
450 | ptid_t, | |
451 | struct target_waitstatus *, | |
452 | int); | |
453 | ||
6e9567fe JB |
454 | static void |
455 | show_fbsd_lwp_debug (struct ui_file *file, int from_tty, | |
456 | struct cmd_list_element *c, const char *value) | |
457 | { | |
458 | fprintf_filtered (file, _("Debugging of FreeBSD lwp module is %s.\n"), value); | |
459 | } | |
460 | ||
461 | #if defined(TDP_RFPPWAIT) || defined(HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME) | |
462 | /* Fetch the external variant of the kernel's internal process | |
463 | structure for the process PID into KP. */ | |
464 | ||
465 | static void | |
466 | fbsd_fetch_kinfo_proc (pid_t pid, struct kinfo_proc *kp) | |
467 | { | |
468 | size_t len; | |
469 | int mib[4]; | |
470 | ||
471 | len = sizeof *kp; | |
472 | mib[0] = CTL_KERN; | |
473 | mib[1] = KERN_PROC; | |
474 | mib[2] = KERN_PROC_PID; | |
475 | mib[3] = pid; | |
476 | if (sysctl (mib, 4, kp, &len, NULL, 0) == -1) | |
477 | perror_with_name (("sysctl")); | |
478 | } | |
479 | #endif | |
480 | ||
481 | /* | |
482 | FreeBSD's first thread support was via a "reentrant" version of libc | |
483 | (libc_r) that first shipped in 2.2.7. This library multiplexed all | |
484 | of the threads in a process onto a single kernel thread. This | |
4c7bf4f9 | 485 | library was supported via the bsd-uthread target. |
6e9567fe JB |
486 | |
487 | FreeBSD 5.1 introduced two new threading libraries that made use of | |
488 | multiple kernel threads. The first (libkse) scheduled M user | |
489 | threads onto N (<= M) kernel threads (LWPs). The second (libthr) | |
490 | bound each user thread to a dedicated kernel thread. libkse shipped | |
491 | as the default threading library (libpthread). | |
492 | ||
493 | FreeBSD 5.3 added a libthread_db to abstract the interface across | |
494 | the various thread libraries (libc_r, libkse, and libthr). | |
495 | ||
496 | FreeBSD 7.0 switched the default threading library from from libkse | |
497 | to libpthread and removed libc_r. | |
498 | ||
499 | FreeBSD 8.0 removed libkse and the in-kernel support for it. The | |
500 | only threading library supported by 8.0 and later is libthr which | |
501 | ties each user thread directly to an LWP. To simplify the | |
502 | implementation, this target only supports LWP-backed threads using | |
503 | ptrace directly rather than libthread_db. | |
504 | ||
505 | FreeBSD 11.0 introduced LWP event reporting via PT_LWP_EVENTS. | |
506 | */ | |
507 | ||
508 | /* Return true if PTID is still active in the inferior. */ | |
509 | ||
510 | static int | |
511 | fbsd_thread_alive (struct target_ops *ops, ptid_t ptid) | |
512 | { | |
513 | if (ptid_lwp_p (ptid)) | |
514 | { | |
515 | struct ptrace_lwpinfo pl; | |
516 | ||
517 | if (ptrace (PT_LWPINFO, ptid_get_lwp (ptid), (caddr_t) &pl, sizeof pl) | |
518 | == -1) | |
519 | return 0; | |
520 | #ifdef PL_FLAG_EXITED | |
521 | if (pl.pl_flags & PL_FLAG_EXITED) | |
522 | return 0; | |
523 | #endif | |
524 | } | |
525 | ||
526 | return 1; | |
527 | } | |
528 | ||
529 | /* Convert PTID to a string. Returns the string in a static | |
530 | buffer. */ | |
531 | ||
7a114964 | 532 | static const char * |
6e9567fe JB |
533 | fbsd_pid_to_str (struct target_ops *ops, ptid_t ptid) |
534 | { | |
535 | lwpid_t lwp; | |
536 | ||
537 | lwp = ptid_get_lwp (ptid); | |
538 | if (lwp != 0) | |
539 | { | |
540 | static char buf[64]; | |
541 | int pid = ptid_get_pid (ptid); | |
542 | ||
b2bae2f7 | 543 | xsnprintf (buf, sizeof buf, "LWP %d of process %d", lwp, pid); |
6e9567fe JB |
544 | return buf; |
545 | } | |
546 | ||
547 | return normal_pid_to_str (ptid); | |
548 | } | |
549 | ||
550 | #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME | |
551 | /* Return the name assigned to a thread by an application. Returns | |
552 | the string in a static buffer. */ | |
553 | ||
554 | static const char * | |
555 | fbsd_thread_name (struct target_ops *self, struct thread_info *thr) | |
556 | { | |
557 | struct ptrace_lwpinfo pl; | |
558 | struct kinfo_proc kp; | |
559 | int pid = ptid_get_pid (thr->ptid); | |
560 | long lwp = ptid_get_lwp (thr->ptid); | |
561 | static char buf[sizeof pl.pl_tdname + 1]; | |
562 | ||
563 | /* Note that ptrace_lwpinfo returns the process command in pl_tdname | |
564 | if a name has not been set explicitly. Return a NULL name in | |
565 | that case. */ | |
566 | fbsd_fetch_kinfo_proc (pid, &kp); | |
567 | if (ptrace (PT_LWPINFO, lwp, (caddr_t) &pl, sizeof pl) == -1) | |
568 | perror_with_name (("ptrace")); | |
569 | if (strcmp (kp.ki_comm, pl.pl_tdname) == 0) | |
570 | return NULL; | |
571 | xsnprintf (buf, sizeof buf, "%s", pl.pl_tdname); | |
572 | return buf; | |
573 | } | |
574 | #endif | |
575 | ||
da95a26c | 576 | /* Enable additional event reporting on new processes. |
6e9567fe | 577 | |
da95a26c JB |
578 | To catch fork events, PTRACE_FORK is set on every traced process |
579 | to enable stops on returns from fork or vfork. Note that both the | |
580 | parent and child will always stop, even if system call stops are | |
581 | not enabled. | |
582 | ||
583 | To catch LWP events, PTRACE_EVENTS is set on every traced process. | |
6e9567fe JB |
584 | This enables stops on the birth for new LWPs (excluding the "main" LWP) |
585 | and the death of LWPs (excluding the last LWP in a process). Note | |
586 | that unlike fork events, the LWP that creates a new LWP does not | |
587 | report an event. */ | |
588 | ||
589 | static void | |
da95a26c | 590 | fbsd_enable_proc_events (pid_t pid) |
6e9567fe | 591 | { |
da95a26c JB |
592 | #ifdef PT_GET_EVENT_MASK |
593 | int events; | |
594 | ||
595 | if (ptrace (PT_GET_EVENT_MASK, pid, (PTRACE_TYPE_ARG3)&events, | |
596 | sizeof (events)) == -1) | |
597 | perror_with_name (("ptrace")); | |
598 | events |= PTRACE_FORK | PTRACE_LWP; | |
dbaed385 JB |
599 | #ifdef PTRACE_VFORK |
600 | events |= PTRACE_VFORK; | |
601 | #endif | |
da95a26c JB |
602 | if (ptrace (PT_SET_EVENT_MASK, pid, (PTRACE_TYPE_ARG3)&events, |
603 | sizeof (events)) == -1) | |
604 | perror_with_name (("ptrace")); | |
605 | #else | |
606 | #ifdef TDP_RFPPWAIT | |
607 | if (ptrace (PT_FOLLOW_FORK, pid, (PTRACE_TYPE_ARG3)0, 1) == -1) | |
608 | perror_with_name (("ptrace")); | |
609 | #endif | |
610 | #ifdef PT_LWP_EVENTS | |
6e9567fe JB |
611 | if (ptrace (PT_LWP_EVENTS, pid, (PTRACE_TYPE_ARG3)0, 1) == -1) |
612 | perror_with_name (("ptrace")); | |
6e9567fe | 613 | #endif |
da95a26c JB |
614 | #endif |
615 | } | |
6e9567fe JB |
616 | |
617 | /* Add threads for any new LWPs in a process. | |
618 | ||
619 | When LWP events are used, this function is only used to detect existing | |
620 | threads when attaching to a process. On older systems, this function is | |
621 | called to discover new threads each time the thread list is updated. */ | |
622 | ||
623 | static void | |
624 | fbsd_add_threads (pid_t pid) | |
625 | { | |
6e9567fe JB |
626 | int i, nlwps; |
627 | ||
628 | gdb_assert (!in_thread_list (pid_to_ptid (pid))); | |
629 | nlwps = ptrace (PT_GETNUMLWPS, pid, NULL, 0); | |
630 | if (nlwps == -1) | |
631 | perror_with_name (("ptrace")); | |
632 | ||
e4a26669 | 633 | gdb::unique_xmalloc_ptr<lwpid_t> lwps (XCNEWVEC (lwpid_t, nlwps)); |
6e9567fe | 634 | |
e4a26669 | 635 | nlwps = ptrace (PT_GETLWPLIST, pid, (caddr_t) lwps.get (), nlwps); |
6e9567fe JB |
636 | if (nlwps == -1) |
637 | perror_with_name (("ptrace")); | |
638 | ||
639 | for (i = 0; i < nlwps; i++) | |
640 | { | |
e4a26669 JB |
641 | lwpid_t lwp = lwps.get ()[i]; |
642 | ptid_t ptid = ptid_build (pid, lwp, 0); | |
6e9567fe JB |
643 | |
644 | if (!in_thread_list (ptid)) | |
645 | { | |
646 | #ifdef PT_LWP_EVENTS | |
647 | struct ptrace_lwpinfo pl; | |
648 | ||
649 | /* Don't add exited threads. Note that this is only called | |
650 | when attaching to a multi-threaded process. */ | |
e4a26669 | 651 | if (ptrace (PT_LWPINFO, lwp, (caddr_t) &pl, sizeof pl) == -1) |
6e9567fe JB |
652 | perror_with_name (("ptrace")); |
653 | if (pl.pl_flags & PL_FLAG_EXITED) | |
654 | continue; | |
655 | #endif | |
656 | if (debug_fbsd_lwp) | |
657 | fprintf_unfiltered (gdb_stdlog, | |
658 | "FLWP: adding thread for LWP %u\n", | |
e4a26669 | 659 | lwp); |
6e9567fe JB |
660 | add_thread (ptid); |
661 | } | |
662 | } | |
6e9567fe JB |
663 | } |
664 | ||
665 | /* Implement the "to_update_thread_list" target_ops method. */ | |
666 | ||
667 | static void | |
668 | fbsd_update_thread_list (struct target_ops *ops) | |
669 | { | |
670 | #ifdef PT_LWP_EVENTS | |
671 | /* With support for thread events, threads are added/deleted from the | |
672 | list as events are reported, so just try deleting exited threads. */ | |
673 | delete_exited_threads (); | |
674 | #else | |
675 | prune_threads (); | |
676 | ||
677 | fbsd_add_threads (ptid_get_pid (inferior_ptid)); | |
678 | #endif | |
679 | } | |
680 | ||
e58e05d6 JB |
681 | #ifdef TDP_RFPPWAIT |
682 | /* | |
683 | To catch fork events, PT_FOLLOW_FORK is set on every traced process | |
684 | to enable stops on returns from fork or vfork. Note that both the | |
685 | parent and child will always stop, even if system call stops are not | |
686 | enabled. | |
687 | ||
688 | After a fork, both the child and parent process will stop and report | |
689 | an event. However, there is no guarantee of order. If the parent | |
690 | reports its stop first, then fbsd_wait explicitly waits for the new | |
691 | child before returning. If the child reports its stop first, then | |
692 | the event is saved on a list and ignored until the parent's stop is | |
693 | reported. fbsd_wait could have been changed to fetch the parent PID | |
694 | of the new child and used that to wait for the parent explicitly. | |
695 | However, if two threads in the parent fork at the same time, then | |
696 | the wait on the parent might return the "wrong" fork event. | |
697 | ||
698 | The initial version of PT_FOLLOW_FORK did not set PL_FLAG_CHILD for | |
699 | the new child process. This flag could be inferred by treating any | |
700 | events for an unknown pid as a new child. | |
701 | ||
702 | In addition, the initial version of PT_FOLLOW_FORK did not report a | |
703 | stop event for the parent process of a vfork until after the child | |
704 | process executed a new program or exited. The kernel was changed to | |
705 | defer the wait for exit or exec of the child until after posting the | |
706 | stop event shortly after the change to introduce PL_FLAG_CHILD. | |
707 | This could be worked around by reporting a vfork event when the | |
708 | child event posted and ignoring the subsequent event from the | |
709 | parent. | |
710 | ||
711 | This implementation requires both of these fixes for simplicity's | |
712 | sake. FreeBSD versions newer than 9.1 contain both fixes. | |
713 | */ | |
714 | ||
2c5c2a33 | 715 | struct fbsd_fork_info |
e58e05d6 | 716 | { |
2c5c2a33 JB |
717 | struct fbsd_fork_info *next; |
718 | ptid_t ptid; | |
e58e05d6 JB |
719 | }; |
720 | ||
2c5c2a33 | 721 | static struct fbsd_fork_info *fbsd_pending_children; |
e58e05d6 JB |
722 | |
723 | /* Record a new child process event that is reported before the | |
724 | corresponding fork event in the parent. */ | |
725 | ||
726 | static void | |
6e9567fe | 727 | fbsd_remember_child (ptid_t pid) |
e58e05d6 | 728 | { |
2c5c2a33 | 729 | struct fbsd_fork_info *info = XCNEW (struct fbsd_fork_info); |
e58e05d6 | 730 | |
2c5c2a33 | 731 | info->ptid = pid; |
e58e05d6 JB |
732 | info->next = fbsd_pending_children; |
733 | fbsd_pending_children = info; | |
734 | } | |
735 | ||
736 | /* Check for a previously-recorded new child process event for PID. | |
6e9567fe | 737 | If one is found, remove it from the list and return the PTID. */ |
e58e05d6 | 738 | |
6e9567fe | 739 | static ptid_t |
e58e05d6 JB |
740 | fbsd_is_child_pending (pid_t pid) |
741 | { | |
2c5c2a33 | 742 | struct fbsd_fork_info *info, *prev; |
6e9567fe | 743 | ptid_t ptid; |
e58e05d6 JB |
744 | |
745 | prev = NULL; | |
746 | for (info = fbsd_pending_children; info; prev = info, info = info->next) | |
747 | { | |
2c5c2a33 | 748 | if (ptid_get_pid (info->ptid) == pid) |
e58e05d6 JB |
749 | { |
750 | if (prev == NULL) | |
751 | fbsd_pending_children = info->next; | |
752 | else | |
753 | prev->next = info->next; | |
2c5c2a33 | 754 | ptid = info->ptid; |
e58e05d6 | 755 | xfree (info); |
6e9567fe | 756 | return ptid; |
e58e05d6 JB |
757 | } |
758 | } | |
6e9567fe | 759 | return null_ptid; |
e58e05d6 | 760 | } |
2c5c2a33 | 761 | |
dbaed385 | 762 | #ifndef PTRACE_VFORK |
2c5c2a33 JB |
763 | static struct fbsd_fork_info *fbsd_pending_vfork_done; |
764 | ||
765 | /* Record a pending vfork done event. */ | |
766 | ||
767 | static void | |
768 | fbsd_add_vfork_done (ptid_t pid) | |
769 | { | |
770 | struct fbsd_fork_info *info = XCNEW (struct fbsd_fork_info); | |
771 | ||
772 | info->ptid = pid; | |
773 | info->next = fbsd_pending_vfork_done; | |
774 | fbsd_pending_vfork_done = info; | |
775 | } | |
776 | ||
777 | /* Check for a pending vfork done event for a specific PID. */ | |
778 | ||
779 | static int | |
780 | fbsd_is_vfork_done_pending (pid_t pid) | |
781 | { | |
782 | struct fbsd_fork_info *info; | |
783 | ||
784 | for (info = fbsd_pending_vfork_done; info != NULL; info = info->next) | |
785 | { | |
786 | if (ptid_get_pid (info->ptid) == pid) | |
787 | return 1; | |
788 | } | |
789 | return 0; | |
790 | } | |
791 | ||
792 | /* Check for a pending vfork done event. If one is found, remove it | |
793 | from the list and return the PTID. */ | |
794 | ||
ee950322 | 795 | static ptid_t |
2c5c2a33 JB |
796 | fbsd_next_vfork_done (void) |
797 | { | |
798 | struct fbsd_fork_info *info; | |
799 | ptid_t ptid; | |
800 | ||
801 | if (fbsd_pending_vfork_done != NULL) | |
802 | { | |
803 | info = fbsd_pending_vfork_done; | |
804 | fbsd_pending_vfork_done = info->next; | |
805 | ptid = info->ptid; | |
806 | xfree (info); | |
807 | return ptid; | |
808 | } | |
809 | return null_ptid; | |
810 | } | |
e58e05d6 | 811 | #endif |
dbaed385 | 812 | #endif |
e58e05d6 | 813 | |
8607ea63 JB |
814 | /* Implement the "to_resume" target_ops method. */ |
815 | ||
816 | static void | |
817 | fbsd_resume (struct target_ops *ops, | |
818 | ptid_t ptid, int step, enum gdb_signal signo) | |
819 | { | |
dbaed385 | 820 | #if defined(TDP_RFPPWAIT) && !defined(PTRACE_VFORK) |
2c5c2a33 JB |
821 | pid_t pid; |
822 | ||
823 | /* Don't PT_CONTINUE a process which has a pending vfork done event. */ | |
824 | if (ptid_equal (minus_one_ptid, ptid)) | |
825 | pid = ptid_get_pid (inferior_ptid); | |
826 | else | |
827 | pid = ptid_get_pid (ptid); | |
828 | if (fbsd_is_vfork_done_pending (pid)) | |
829 | return; | |
830 | #endif | |
8607ea63 JB |
831 | |
832 | if (debug_fbsd_lwp) | |
833 | fprintf_unfiltered (gdb_stdlog, | |
834 | "FLWP: fbsd_resume for ptid (%d, %ld, %ld)\n", | |
835 | ptid_get_pid (ptid), ptid_get_lwp (ptid), | |
836 | ptid_get_tid (ptid)); | |
837 | if (ptid_lwp_p (ptid)) | |
838 | { | |
839 | /* If ptid is a specific LWP, suspend all other LWPs in the process. */ | |
d56060f0 JB |
840 | struct thread_info *tp; |
841 | int request; | |
842 | ||
843 | ALL_NON_EXITED_THREADS (tp) | |
844 | { | |
845 | if (ptid_get_pid (tp->ptid) != ptid_get_pid (ptid)) | |
846 | continue; | |
847 | ||
848 | if (ptid_get_lwp (tp->ptid) == ptid_get_lwp (ptid)) | |
849 | request = PT_RESUME; | |
850 | else | |
851 | request = PT_SUSPEND; | |
852 | ||
853 | if (ptrace (request, ptid_get_lwp (tp->ptid), NULL, 0) == -1) | |
854 | perror_with_name (("ptrace")); | |
855 | } | |
8607ea63 JB |
856 | } |
857 | else | |
858 | { | |
859 | /* If ptid is a wildcard, resume all matching threads (they won't run | |
860 | until the process is continued however). */ | |
d56060f0 JB |
861 | struct thread_info *tp; |
862 | ||
863 | ALL_NON_EXITED_THREADS (tp) | |
864 | { | |
865 | if (!ptid_match (tp->ptid, ptid)) | |
866 | continue; | |
867 | ||
868 | if (ptrace (PT_RESUME, ptid_get_lwp (tp->ptid), NULL, 0) == -1) | |
869 | perror_with_name (("ptrace")); | |
870 | } | |
8607ea63 JB |
871 | ptid = inferior_ptid; |
872 | } | |
873 | super_resume (ops, ptid, step, signo); | |
874 | } | |
875 | ||
e58e05d6 JB |
876 | /* Wait for the child specified by PTID to do something. Return the |
877 | process ID of the child, or MINUS_ONE_PTID in case of error; store | |
878 | the status in *OURSTATUS. */ | |
879 | ||
880 | static ptid_t | |
881 | fbsd_wait (struct target_ops *ops, | |
882 | ptid_t ptid, struct target_waitstatus *ourstatus, | |
883 | int target_options) | |
884 | { | |
885 | ptid_t wptid; | |
886 | ||
887 | while (1) | |
888 | { | |
dbaed385 | 889 | #ifndef PTRACE_VFORK |
2c5c2a33 JB |
890 | wptid = fbsd_next_vfork_done (); |
891 | if (!ptid_equal (wptid, null_ptid)) | |
892 | { | |
893 | ourstatus->kind = TARGET_WAITKIND_VFORK_DONE; | |
894 | return wptid; | |
895 | } | |
dbaed385 | 896 | #endif |
e58e05d6 JB |
897 | wptid = super_wait (ops, ptid, ourstatus, target_options); |
898 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED) | |
899 | { | |
900 | struct ptrace_lwpinfo pl; | |
901 | pid_t pid; | |
902 | int status; | |
903 | ||
904 | pid = ptid_get_pid (wptid); | |
6e9567fe | 905 | if (ptrace (PT_LWPINFO, pid, (caddr_t) &pl, sizeof pl) == -1) |
e58e05d6 JB |
906 | perror_with_name (("ptrace")); |
907 | ||
6e9567fe JB |
908 | wptid = ptid_build (pid, pl.pl_lwpid, 0); |
909 | ||
910 | #ifdef PT_LWP_EVENTS | |
911 | if (pl.pl_flags & PL_FLAG_EXITED) | |
912 | { | |
913 | /* If GDB attaches to a multi-threaded process, exiting | |
914 | threads might be skipped during fbsd_post_attach that | |
915 | have not yet reported their PL_FLAG_EXITED event. | |
916 | Ignore EXITED events for an unknown LWP. */ | |
917 | if (in_thread_list (wptid)) | |
918 | { | |
919 | if (debug_fbsd_lwp) | |
920 | fprintf_unfiltered (gdb_stdlog, | |
921 | "FLWP: deleting thread for LWP %u\n", | |
922 | pl.pl_lwpid); | |
923 | if (print_thread_events) | |
924 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str | |
925 | (wptid)); | |
926 | delete_thread (wptid); | |
927 | } | |
928 | if (ptrace (PT_CONTINUE, pid, (caddr_t) 1, 0) == -1) | |
929 | perror_with_name (("ptrace")); | |
930 | continue; | |
931 | } | |
932 | #endif | |
933 | ||
934 | /* Switch to an LWP PTID on the first stop in a new process. | |
935 | This is done after handling PL_FLAG_EXITED to avoid | |
936 | switching to an exited LWP. It is done before checking | |
937 | PL_FLAG_BORN in case the first stop reported after | |
938 | attaching to an existing process is a PL_FLAG_BORN | |
939 | event. */ | |
940 | if (in_thread_list (pid_to_ptid (pid))) | |
941 | { | |
942 | if (debug_fbsd_lwp) | |
943 | fprintf_unfiltered (gdb_stdlog, | |
944 | "FLWP: using LWP %u for first thread\n", | |
945 | pl.pl_lwpid); | |
946 | thread_change_ptid (pid_to_ptid (pid), wptid); | |
947 | } | |
948 | ||
949 | #ifdef PT_LWP_EVENTS | |
950 | if (pl.pl_flags & PL_FLAG_BORN) | |
951 | { | |
952 | /* If GDB attaches to a multi-threaded process, newborn | |
953 | threads might be added by fbsd_add_threads that have | |
954 | not yet reported their PL_FLAG_BORN event. Ignore | |
955 | BORN events for an already-known LWP. */ | |
956 | if (!in_thread_list (wptid)) | |
957 | { | |
958 | if (debug_fbsd_lwp) | |
959 | fprintf_unfiltered (gdb_stdlog, | |
960 | "FLWP: adding thread for LWP %u\n", | |
961 | pl.pl_lwpid); | |
962 | add_thread (wptid); | |
963 | } | |
964 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
965 | return wptid; | |
966 | } | |
967 | #endif | |
968 | ||
e58e05d6 JB |
969 | #ifdef TDP_RFPPWAIT |
970 | if (pl.pl_flags & PL_FLAG_FORKED) | |
971 | { | |
dbaed385 | 972 | #ifndef PTRACE_VFORK |
e58e05d6 | 973 | struct kinfo_proc kp; |
dbaed385 | 974 | #endif |
6e9567fe | 975 | ptid_t child_ptid; |
e58e05d6 JB |
976 | pid_t child; |
977 | ||
978 | child = pl.pl_child_pid; | |
979 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
dbaed385 JB |
980 | #ifdef PTRACE_VFORK |
981 | if (pl.pl_flags & PL_FLAG_VFORKED) | |
982 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
983 | #endif | |
e58e05d6 JB |
984 | |
985 | /* Make sure the other end of the fork is stopped too. */ | |
6e9567fe JB |
986 | child_ptid = fbsd_is_child_pending (child); |
987 | if (ptid_equal (child_ptid, null_ptid)) | |
e58e05d6 JB |
988 | { |
989 | pid = waitpid (child, &status, 0); | |
990 | if (pid == -1) | |
991 | perror_with_name (("waitpid")); | |
992 | ||
993 | gdb_assert (pid == child); | |
994 | ||
995 | if (ptrace (PT_LWPINFO, child, (caddr_t)&pl, sizeof pl) == -1) | |
996 | perror_with_name (("ptrace")); | |
997 | ||
998 | gdb_assert (pl.pl_flags & PL_FLAG_CHILD); | |
6e9567fe | 999 | child_ptid = ptid_build (child, pl.pl_lwpid, 0); |
e58e05d6 JB |
1000 | } |
1001 | ||
5fa14c6b JB |
1002 | /* Enable additional events on the child process. */ |
1003 | fbsd_enable_proc_events (ptid_get_pid (child_ptid)); | |
1004 | ||
dbaed385 | 1005 | #ifndef PTRACE_VFORK |
e58e05d6 JB |
1006 | /* For vfork, the child process will have the P_PPWAIT |
1007 | flag set. */ | |
1008 | fbsd_fetch_kinfo_proc (child, &kp); | |
1009 | if (kp.ki_flag & P_PPWAIT) | |
1010 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
dbaed385 | 1011 | #endif |
6e9567fe | 1012 | ourstatus->value.related_pid = child_ptid; |
e58e05d6 JB |
1013 | |
1014 | return wptid; | |
1015 | } | |
1016 | ||
1017 | if (pl.pl_flags & PL_FLAG_CHILD) | |
1018 | { | |
1019 | /* Remember that this child forked, but do not report it | |
1020 | until the parent reports its corresponding fork | |
1021 | event. */ | |
6e9567fe | 1022 | fbsd_remember_child (wptid); |
e58e05d6 JB |
1023 | continue; |
1024 | } | |
dbaed385 JB |
1025 | |
1026 | #ifdef PTRACE_VFORK | |
1027 | if (pl.pl_flags & PL_FLAG_VFORK_DONE) | |
1028 | { | |
1029 | ourstatus->kind = TARGET_WAITKIND_VFORK_DONE; | |
1030 | return wptid; | |
1031 | } | |
1032 | #endif | |
e58e05d6 | 1033 | #endif |
d2b41ca0 JB |
1034 | |
1035 | #ifdef PL_FLAG_EXEC | |
1036 | if (pl.pl_flags & PL_FLAG_EXEC) | |
1037 | { | |
1038 | ourstatus->kind = TARGET_WAITKIND_EXECD; | |
1039 | ourstatus->value.execd_pathname | |
1040 | = xstrdup (fbsd_pid_to_exec_file (NULL, pid)); | |
1041 | return wptid; | |
1042 | } | |
1043 | #endif | |
e6cdd38e JB |
1044 | |
1045 | /* Note that PL_FLAG_SCE is set for any event reported while | |
1046 | a thread is executing a system call in the kernel. In | |
1047 | particular, signals that interrupt a sleep in a system | |
1048 | call will report this flag as part of their event. Stops | |
1049 | explicitly for system call entry and exit always use | |
1050 | SIGTRAP, so only treat SIGTRAP events as system call | |
1051 | entry/exit events. */ | |
1052 | if (pl.pl_flags & (PL_FLAG_SCE | PL_FLAG_SCX) | |
1053 | && ourstatus->value.sig == SIGTRAP) | |
1054 | { | |
1055 | #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE | |
1056 | if (catch_syscall_enabled ()) | |
1057 | { | |
1058 | if (catching_syscall_number (pl.pl_syscall_code)) | |
1059 | { | |
1060 | if (pl.pl_flags & PL_FLAG_SCE) | |
1061 | ourstatus->kind = TARGET_WAITKIND_SYSCALL_ENTRY; | |
1062 | else | |
1063 | ourstatus->kind = TARGET_WAITKIND_SYSCALL_RETURN; | |
1064 | ourstatus->value.syscall_number = pl.pl_syscall_code; | |
1065 | return wptid; | |
1066 | } | |
1067 | } | |
1068 | #endif | |
1069 | /* If the core isn't interested in this event, just | |
1070 | continue the process explicitly and wait for another | |
1071 | event. Note that PT_SYSCALL is "sticky" on FreeBSD | |
1072 | and once system call stops are enabled on a process | |
1073 | it stops for all system call entries and exits. */ | |
1074 | if (ptrace (PT_CONTINUE, pid, (caddr_t) 1, 0) == -1) | |
1075 | perror_with_name (("ptrace")); | |
1076 | continue; | |
1077 | } | |
e58e05d6 JB |
1078 | } |
1079 | return wptid; | |
1080 | } | |
1081 | } | |
1082 | ||
1083 | #ifdef TDP_RFPPWAIT | |
1084 | /* Target hook for follow_fork. On entry and at return inferior_ptid is | |
1085 | the ptid of the followed inferior. */ | |
1086 | ||
1087 | static int | |
1088 | fbsd_follow_fork (struct target_ops *ops, int follow_child, | |
1089 | int detach_fork) | |
1090 | { | |
bb2a62e6 | 1091 | if (!follow_child && detach_fork) |
e58e05d6 JB |
1092 | { |
1093 | struct thread_info *tp = inferior_thread (); | |
1094 | pid_t child_pid = ptid_get_pid (tp->pending_follow.value.related_pid); | |
1095 | ||
1096 | /* Breakpoints have already been detached from the child by | |
1097 | infrun.c. */ | |
1098 | ||
1099 | if (ptrace (PT_DETACH, child_pid, (PTRACE_TYPE_ARG3)1, 0) == -1) | |
1100 | perror_with_name (("ptrace")); | |
2c5c2a33 | 1101 | |
dbaed385 JB |
1102 | #ifndef PTRACE_VFORK |
1103 | if (tp->pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
2c5c2a33 JB |
1104 | { |
1105 | /* We can't insert breakpoints until the child process has | |
1106 | finished with the shared memory region. The parent | |
1107 | process doesn't wait for the child process to exit or | |
1108 | exec until after it has been resumed from the ptrace stop | |
1109 | to report the fork. Once it has been resumed it doesn't | |
1110 | stop again before returning to userland, so there is no | |
1111 | reliable way to wait on the parent. | |
1112 | ||
1113 | We can't stay attached to the child to wait for an exec | |
1114 | or exit because it may invoke ptrace(PT_TRACE_ME) | |
1115 | (e.g. if the parent process is a debugger forking a new | |
1116 | child process). | |
1117 | ||
1118 | In the end, the best we can do is to make sure it runs | |
1119 | for a little while. Hopefully it will be out of range of | |
1120 | any breakpoints we reinsert. Usually this is only the | |
1121 | single-step breakpoint at vfork's return point. */ | |
1122 | ||
1123 | usleep (10000); | |
1124 | ||
1125 | /* Schedule a fake VFORK_DONE event to report on the next | |
1126 | wait. */ | |
1127 | fbsd_add_vfork_done (inferior_ptid); | |
1128 | } | |
dbaed385 | 1129 | #endif |
e58e05d6 JB |
1130 | } |
1131 | ||
1132 | return 0; | |
1133 | } | |
1134 | ||
1135 | static int | |
1136 | fbsd_insert_fork_catchpoint (struct target_ops *self, int pid) | |
1137 | { | |
1138 | return 0; | |
1139 | } | |
1140 | ||
1141 | static int | |
1142 | fbsd_remove_fork_catchpoint (struct target_ops *self, int pid) | |
1143 | { | |
1144 | return 0; | |
1145 | } | |
1146 | ||
1147 | static int | |
1148 | fbsd_insert_vfork_catchpoint (struct target_ops *self, int pid) | |
1149 | { | |
1150 | return 0; | |
1151 | } | |
1152 | ||
1153 | static int | |
1154 | fbsd_remove_vfork_catchpoint (struct target_ops *self, int pid) | |
1155 | { | |
1156 | return 0; | |
1157 | } | |
6e9567fe | 1158 | #endif |
e58e05d6 JB |
1159 | |
1160 | /* Implement the "to_post_startup_inferior" target_ops method. */ | |
1161 | ||
1162 | static void | |
1163 | fbsd_post_startup_inferior (struct target_ops *self, ptid_t pid) | |
1164 | { | |
da95a26c | 1165 | fbsd_enable_proc_events (ptid_get_pid (pid)); |
e58e05d6 JB |
1166 | } |
1167 | ||
1168 | /* Implement the "to_post_attach" target_ops method. */ | |
1169 | ||
1170 | static void | |
1171 | fbsd_post_attach (struct target_ops *self, int pid) | |
1172 | { | |
da95a26c | 1173 | fbsd_enable_proc_events (pid); |
6e9567fe JB |
1174 | fbsd_add_threads (pid); |
1175 | } | |
d2b41ca0 JB |
1176 | |
1177 | #ifdef PL_FLAG_EXEC | |
1178 | /* If the FreeBSD kernel supports PL_FLAG_EXEC, then traced processes | |
1179 | will always stop after exec. */ | |
1180 | ||
1181 | static int | |
1182 | fbsd_insert_exec_catchpoint (struct target_ops *self, int pid) | |
1183 | { | |
1184 | return 0; | |
1185 | } | |
1186 | ||
1187 | static int | |
1188 | fbsd_remove_exec_catchpoint (struct target_ops *self, int pid) | |
1189 | { | |
1190 | return 0; | |
1191 | } | |
1192 | #endif | |
e6cdd38e JB |
1193 | |
1194 | #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE | |
1195 | static int | |
1196 | fbsd_set_syscall_catchpoint (struct target_ops *self, int pid, int needed, | |
1197 | int any_count, int table_size, int *table) | |
1198 | { | |
1199 | ||
1200 | /* Ignore the arguments. inf-ptrace.c will use PT_SYSCALL which | |
1201 | will catch all system call entries and exits. The system calls | |
1202 | are filtered by GDB rather than the kernel. */ | |
1203 | return 0; | |
1204 | } | |
1205 | #endif | |
e58e05d6 JB |
1206 | #endif |
1207 | ||
8f60fe01 JB |
1208 | void |
1209 | fbsd_nat_add_target (struct target_ops *t) | |
1210 | { | |
1211 | t->to_pid_to_exec_file = fbsd_pid_to_exec_file; | |
1212 | t->to_find_memory_regions = fbsd_find_memory_regions; | |
7697fc9e JB |
1213 | #ifdef KERN_PROC_AUXV |
1214 | super_xfer_partial = t->to_xfer_partial; | |
1215 | t->to_xfer_partial = fbsd_xfer_partial; | |
1216 | #endif | |
e58e05d6 | 1217 | #ifdef PT_LWPINFO |
6e9567fe JB |
1218 | t->to_thread_alive = fbsd_thread_alive; |
1219 | t->to_pid_to_str = fbsd_pid_to_str; | |
1220 | #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME | |
1221 | t->to_thread_name = fbsd_thread_name; | |
1222 | #endif | |
1223 | t->to_update_thread_list = fbsd_update_thread_list; | |
1224 | t->to_has_thread_control = tc_schedlock; | |
1225 | super_resume = t->to_resume; | |
1226 | t->to_resume = fbsd_resume; | |
e58e05d6 JB |
1227 | super_wait = t->to_wait; |
1228 | t->to_wait = fbsd_wait; | |
6e9567fe JB |
1229 | t->to_post_startup_inferior = fbsd_post_startup_inferior; |
1230 | t->to_post_attach = fbsd_post_attach; | |
e58e05d6 JB |
1231 | #ifdef TDP_RFPPWAIT |
1232 | t->to_follow_fork = fbsd_follow_fork; | |
1233 | t->to_insert_fork_catchpoint = fbsd_insert_fork_catchpoint; | |
1234 | t->to_remove_fork_catchpoint = fbsd_remove_fork_catchpoint; | |
1235 | t->to_insert_vfork_catchpoint = fbsd_insert_vfork_catchpoint; | |
1236 | t->to_remove_vfork_catchpoint = fbsd_remove_vfork_catchpoint; | |
e58e05d6 | 1237 | #endif |
d2b41ca0 JB |
1238 | #ifdef PL_FLAG_EXEC |
1239 | t->to_insert_exec_catchpoint = fbsd_insert_exec_catchpoint; | |
1240 | t->to_remove_exec_catchpoint = fbsd_remove_exec_catchpoint; | |
1241 | #endif | |
e6cdd38e JB |
1242 | #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE |
1243 | t->to_set_syscall_catchpoint = fbsd_set_syscall_catchpoint; | |
1244 | #endif | |
e58e05d6 | 1245 | #endif |
8f60fe01 JB |
1246 | add_target (t); |
1247 | } | |
6e9567fe JB |
1248 | |
1249 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
1250 | extern initialize_file_ftype _initialize_fbsd_nat; | |
1251 | ||
1252 | void | |
1253 | _initialize_fbsd_nat (void) | |
1254 | { | |
1255 | #ifdef PT_LWPINFO | |
1256 | add_setshow_boolean_cmd ("fbsd-lwp", class_maintenance, | |
1257 | &debug_fbsd_lwp, _("\ | |
1258 | Set debugging of FreeBSD lwp module."), _("\ | |
1259 | Show debugging of FreeBSD lwp module."), _("\ | |
1260 | Enables printf debugging output."), | |
1261 | NULL, | |
1262 | &show_fbsd_lwp_debug, | |
1263 | &setdebuglist, &showdebuglist); | |
1264 | #endif | |
1265 | } |