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578c1c03 MK |
1 | /* Native-dependent code for FreeBSD. |
2 | ||
e2882c85 | 3 | Copyright (C) 2002-2018 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" |
7efba073 | 29 | #include "inf-ptrace.h" |
578c1c03 | 30 | #include <sys/types.h> |
68b9939a | 31 | #include <sys/procfs.h> |
e58e05d6 | 32 | #include <sys/ptrace.h> |
929edea9 | 33 | #include <sys/signal.h> |
68b9939a | 34 | #include <sys/sysctl.h> |
25268153 | 35 | #include <sys/user.h> |
92fce24d | 36 | #if defined(HAVE_KINFO_GETFILE) || defined(HAVE_KINFO_GETVMMAP) |
25268153 | 37 | #include <libutil.h> |
92fce24d JB |
38 | #endif |
39 | #if !defined(HAVE_KINFO_GETVMMAP) | |
142311d3 | 40 | #include "filestuff.h" |
25268153 | 41 | #endif |
578c1c03 MK |
42 | |
43 | #include "elf-bfd.h" | |
44 | #include "fbsd-nat.h" | |
92fce24d | 45 | #include "fbsd-tdep.h" |
578c1c03 | 46 | |
e8c6b620 JB |
47 | #include <list> |
48 | ||
766062f6 | 49 | /* Return the name of a file that can be opened to get the symbols for |
578c1c03 MK |
50 | the child process identified by PID. */ |
51 | ||
f6ac5f3d PA |
52 | char * |
53 | fbsd_nat_target::pid_to_exec_file (int pid) | |
578c1c03 | 54 | { |
f2feec98 | 55 | ssize_t len; |
b4ab256d HZ |
56 | static char buf[PATH_MAX]; |
57 | char name[PATH_MAX]; | |
578c1c03 | 58 | |
68b9939a | 59 | #ifdef KERN_PROC_PATHNAME |
f2feec98 | 60 | size_t buflen; |
68b9939a | 61 | int mib[4]; |
578c1c03 | 62 | |
68b9939a MK |
63 | mib[0] = CTL_KERN; |
64 | mib[1] = KERN_PROC; | |
65 | mib[2] = KERN_PROC_PATHNAME; | |
66 | mib[3] = pid; | |
f2feec98 JB |
67 | buflen = sizeof buf; |
68 | if (sysctl (mib, 4, buf, &buflen, NULL, 0) == 0) | |
b999e203 JB |
69 | /* The kern.proc.pathname.<pid> sysctl returns a length of zero |
70 | for processes without an associated executable such as kernel | |
71 | processes. */ | |
72 | return buflen == 0 ? NULL : buf; | |
68b9939a | 73 | #endif |
578c1c03 | 74 | |
b4ab256d HZ |
75 | xsnprintf (name, PATH_MAX, "/proc/%d/exe", pid); |
76 | len = readlink (name, buf, PATH_MAX - 1); | |
77 | if (len != -1) | |
68b9939a | 78 | { |
b4ab256d HZ |
79 | buf[len] = '\0'; |
80 | return buf; | |
68b9939a MK |
81 | } |
82 | ||
b4ab256d | 83 | return NULL; |
578c1c03 MK |
84 | } |
85 | ||
25268153 JB |
86 | #ifdef HAVE_KINFO_GETVMMAP |
87 | /* Iterate over all the memory regions in the current inferior, | |
88 | calling FUNC for each memory region. OBFD is passed as the last | |
89 | argument to FUNC. */ | |
90 | ||
f6ac5f3d PA |
91 | int |
92 | fbsd_nat_target::find_memory_regions (find_memory_region_ftype func, | |
93 | void *obfd) | |
25268153 | 94 | { |
e99b03dc | 95 | pid_t pid = inferior_ptid.pid (); |
e4a26669 | 96 | struct kinfo_vmentry *kve; |
25268153 | 97 | uint64_t size; |
25268153 JB |
98 | int i, nitems; |
99 | ||
262f62f5 | 100 | gdb::unique_xmalloc_ptr<struct kinfo_vmentry> |
e4a26669 | 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 | ||
f6ac5f3d PA |
165 | int |
166 | fbsd_nat_target::find_memory_regions (find_memory_region_ftype func, | |
167 | void *obfd) | |
578c1c03 | 168 | { |
e99b03dc | 169 | pid_t pid = inferior_ptid.pid (); |
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 | |
92fce24d JB |
211 | /* Fetch the command line for a running process. */ |
212 | ||
213 | static gdb::unique_xmalloc_ptr<char> | |
214 | fbsd_fetch_cmdline (pid_t pid) | |
215 | { | |
216 | size_t len; | |
217 | int mib[4]; | |
218 | ||
219 | len = 0; | |
220 | mib[0] = CTL_KERN; | |
221 | mib[1] = KERN_PROC; | |
222 | mib[2] = KERN_PROC_ARGS; | |
223 | mib[3] = pid; | |
224 | if (sysctl (mib, 4, NULL, &len, NULL, 0) == -1) | |
225 | return nullptr; | |
226 | ||
227 | if (len == 0) | |
228 | return nullptr; | |
229 | ||
230 | gdb::unique_xmalloc_ptr<char> cmdline ((char *) xmalloc (len)); | |
231 | if (sysctl (mib, 4, cmdline.get (), &len, NULL, 0) == -1) | |
232 | return nullptr; | |
233 | ||
234 | return cmdline; | |
235 | } | |
236 | ||
237 | /* Fetch the external variant of the kernel's internal process | |
238 | structure for the process PID into KP. */ | |
239 | ||
240 | static bool | |
241 | fbsd_fetch_kinfo_proc (pid_t pid, struct kinfo_proc *kp) | |
242 | { | |
243 | size_t len; | |
244 | int mib[4]; | |
245 | ||
246 | len = sizeof *kp; | |
247 | mib[0] = CTL_KERN; | |
248 | mib[1] = KERN_PROC; | |
249 | mib[2] = KERN_PROC_PID; | |
250 | mib[3] = pid; | |
251 | return (sysctl (mib, 4, kp, &len, NULL, 0) == 0); | |
252 | } | |
253 | ||
f6ac5f3d | 254 | /* Implement the "info_proc" target_ops method. */ |
92fce24d | 255 | |
f6ac5f3d PA |
256 | bool |
257 | fbsd_nat_target::info_proc (const char *args, enum info_proc_what what) | |
92fce24d JB |
258 | { |
259 | #ifdef HAVE_KINFO_GETFILE | |
260 | gdb::unique_xmalloc_ptr<struct kinfo_file> fdtbl; | |
261 | int nfd = 0; | |
262 | #endif | |
263 | struct kinfo_proc kp; | |
92fce24d JB |
264 | pid_t pid; |
265 | bool do_cmdline = false; | |
266 | bool do_cwd = false; | |
267 | bool do_exe = false; | |
268 | #ifdef HAVE_KINFO_GETVMMAP | |
269 | bool do_mappings = false; | |
270 | #endif | |
271 | bool do_status = false; | |
272 | ||
273 | switch (what) | |
274 | { | |
275 | case IP_MINIMAL: | |
276 | do_cmdline = true; | |
277 | do_cwd = true; | |
278 | do_exe = true; | |
279 | break; | |
280 | #ifdef HAVE_KINFO_GETVMMAP | |
281 | case IP_MAPPINGS: | |
282 | do_mappings = true; | |
283 | break; | |
284 | #endif | |
285 | case IP_STATUS: | |
286 | case IP_STAT: | |
287 | do_status = true; | |
288 | break; | |
289 | case IP_CMDLINE: | |
290 | do_cmdline = true; | |
291 | break; | |
292 | case IP_EXE: | |
293 | do_exe = true; | |
294 | break; | |
295 | case IP_CWD: | |
296 | do_cwd = true; | |
297 | break; | |
298 | case IP_ALL: | |
299 | do_cmdline = true; | |
300 | do_cwd = true; | |
301 | do_exe = true; | |
302 | #ifdef HAVE_KINFO_GETVMMAP | |
303 | do_mappings = true; | |
304 | #endif | |
305 | do_status = true; | |
306 | break; | |
307 | default: | |
308 | error (_("Not supported on this target.")); | |
309 | } | |
310 | ||
311 | gdb_argv built_argv (args); | |
312 | if (built_argv.count () == 0) | |
313 | { | |
e99b03dc | 314 | pid = inferior_ptid.pid (); |
92fce24d JB |
315 | if (pid == 0) |
316 | error (_("No current process: you must name one.")); | |
317 | } | |
318 | else if (built_argv.count () == 1 && isdigit (built_argv[0][0])) | |
319 | pid = strtol (built_argv[0], NULL, 10); | |
320 | else | |
321 | error (_("Invalid arguments.")); | |
322 | ||
323 | printf_filtered (_("process %d\n"), pid); | |
324 | #ifdef HAVE_KINFO_GETFILE | |
325 | if (do_cwd || do_exe) | |
326 | fdtbl.reset (kinfo_getfile (pid, &nfd)); | |
327 | #endif | |
328 | ||
329 | if (do_cmdline) | |
330 | { | |
331 | gdb::unique_xmalloc_ptr<char> cmdline = fbsd_fetch_cmdline (pid); | |
332 | if (cmdline != nullptr) | |
333 | printf_filtered ("cmdline = '%s'\n", cmdline.get ()); | |
334 | else | |
335 | warning (_("unable to fetch command line")); | |
336 | } | |
337 | if (do_cwd) | |
338 | { | |
339 | const char *cwd = NULL; | |
340 | #ifdef HAVE_KINFO_GETFILE | |
341 | struct kinfo_file *kf = fdtbl.get (); | |
342 | for (int i = 0; i < nfd; i++, kf++) | |
343 | { | |
344 | if (kf->kf_type == KF_TYPE_VNODE && kf->kf_fd == KF_FD_TYPE_CWD) | |
345 | { | |
346 | cwd = kf->kf_path; | |
347 | break; | |
348 | } | |
349 | } | |
350 | #endif | |
351 | if (cwd != NULL) | |
352 | printf_filtered ("cwd = '%s'\n", cwd); | |
353 | else | |
354 | warning (_("unable to fetch current working directory")); | |
355 | } | |
356 | if (do_exe) | |
357 | { | |
358 | const char *exe = NULL; | |
359 | #ifdef HAVE_KINFO_GETFILE | |
360 | struct kinfo_file *kf = fdtbl.get (); | |
361 | for (int i = 0; i < nfd; i++, kf++) | |
362 | { | |
363 | if (kf->kf_type == KF_TYPE_VNODE && kf->kf_fd == KF_FD_TYPE_TEXT) | |
364 | { | |
365 | exe = kf->kf_path; | |
366 | break; | |
367 | } | |
368 | } | |
369 | #endif | |
370 | if (exe == NULL) | |
f6ac5f3d | 371 | exe = pid_to_exec_file (pid); |
92fce24d JB |
372 | if (exe != NULL) |
373 | printf_filtered ("exe = '%s'\n", exe); | |
374 | else | |
375 | warning (_("unable to fetch executable path name")); | |
376 | } | |
377 | #ifdef HAVE_KINFO_GETVMMAP | |
378 | if (do_mappings) | |
379 | { | |
380 | int nvment; | |
381 | gdb::unique_xmalloc_ptr<struct kinfo_vmentry> | |
382 | vmentl (kinfo_getvmmap (pid, &nvment)); | |
383 | ||
384 | if (vmentl != nullptr) | |
385 | { | |
386 | printf_filtered (_("Mapped address spaces:\n\n")); | |
387 | #ifdef __LP64__ | |
388 | printf_filtered (" %18s %18s %10s %10s %9s %s\n", | |
389 | "Start Addr", | |
390 | " End Addr", | |
391 | " Size", " Offset", "Flags ", "File"); | |
392 | #else | |
393 | printf_filtered ("\t%10s %10s %10s %10s %9s %s\n", | |
394 | "Start Addr", | |
395 | " End Addr", | |
396 | " Size", " Offset", "Flags ", "File"); | |
397 | #endif | |
398 | ||
399 | struct kinfo_vmentry *kve = vmentl.get (); | |
400 | for (int i = 0; i < nvment; i++, kve++) | |
401 | { | |
402 | ULONGEST start, end; | |
403 | ||
404 | start = kve->kve_start; | |
405 | end = kve->kve_end; | |
406 | #ifdef __LP64__ | |
407 | printf_filtered (" %18s %18s %10s %10s %9s %s\n", | |
408 | hex_string (start), | |
409 | hex_string (end), | |
410 | hex_string (end - start), | |
411 | hex_string (kve->kve_offset), | |
412 | fbsd_vm_map_entry_flags (kve->kve_flags, | |
413 | kve->kve_protection), | |
414 | kve->kve_path); | |
415 | #else | |
416 | printf_filtered ("\t%10s %10s %10s %10s %9s %s\n", | |
417 | hex_string (start), | |
418 | hex_string (end), | |
419 | hex_string (end - start), | |
420 | hex_string (kve->kve_offset), | |
421 | fbsd_vm_map_entry_flags (kve->kve_flags, | |
422 | kve->kve_protection), | |
423 | kve->kve_path); | |
424 | #endif | |
425 | } | |
426 | } | |
427 | else | |
428 | warning (_("unable to fetch virtual memory map")); | |
429 | } | |
430 | #endif | |
431 | if (do_status) | |
432 | { | |
433 | if (!fbsd_fetch_kinfo_proc (pid, &kp)) | |
434 | warning (_("Failed to fetch process information")); | |
435 | else | |
436 | { | |
437 | const char *state; | |
438 | int pgtok; | |
439 | ||
440 | printf_filtered ("Name: %s\n", kp.ki_comm); | |
441 | switch (kp.ki_stat) | |
442 | { | |
443 | case SIDL: | |
444 | state = "I (idle)"; | |
445 | break; | |
446 | case SRUN: | |
447 | state = "R (running)"; | |
448 | break; | |
449 | case SSTOP: | |
450 | state = "T (stopped)"; | |
451 | break; | |
452 | case SZOMB: | |
453 | state = "Z (zombie)"; | |
454 | break; | |
455 | case SSLEEP: | |
456 | state = "S (sleeping)"; | |
457 | break; | |
458 | case SWAIT: | |
459 | state = "W (interrupt wait)"; | |
460 | break; | |
461 | case SLOCK: | |
462 | state = "L (blocked on lock)"; | |
463 | break; | |
464 | default: | |
465 | state = "? (unknown)"; | |
466 | break; | |
467 | } | |
468 | printf_filtered ("State: %s\n", state); | |
469 | printf_filtered ("Parent process: %d\n", kp.ki_ppid); | |
470 | printf_filtered ("Process group: %d\n", kp.ki_pgid); | |
471 | printf_filtered ("Session id: %d\n", kp.ki_sid); | |
472 | printf_filtered ("TTY: %ju\n", (uintmax_t) kp.ki_tdev); | |
473 | printf_filtered ("TTY owner process group: %d\n", kp.ki_tpgid); | |
474 | printf_filtered ("User IDs (real, effective, saved): %d %d %d\n", | |
475 | kp.ki_ruid, kp.ki_uid, kp.ki_svuid); | |
476 | printf_filtered ("Group IDs (real, effective, saved): %d %d %d\n", | |
477 | kp.ki_rgid, kp.ki_groups[0], kp.ki_svgid); | |
478 | printf_filtered ("Groups: "); | |
479 | for (int i = 0; i < kp.ki_ngroups; i++) | |
480 | printf_filtered ("%d ", kp.ki_groups[i]); | |
481 | printf_filtered ("\n"); | |
482 | printf_filtered ("Minor faults (no memory page): %ld\n", | |
483 | kp.ki_rusage.ru_minflt); | |
484 | printf_filtered ("Minor faults, children: %ld\n", | |
485 | kp.ki_rusage_ch.ru_minflt); | |
486 | printf_filtered ("Major faults (memory page faults): %ld\n", | |
487 | kp.ki_rusage.ru_majflt); | |
488 | printf_filtered ("Major faults, children: %ld\n", | |
489 | kp.ki_rusage_ch.ru_majflt); | |
490 | printf_filtered ("utime: %jd.%06ld\n", | |
491 | (intmax_t) kp.ki_rusage.ru_utime.tv_sec, | |
492 | kp.ki_rusage.ru_utime.tv_usec); | |
493 | printf_filtered ("stime: %jd.%06ld\n", | |
494 | (intmax_t) kp.ki_rusage.ru_stime.tv_sec, | |
495 | kp.ki_rusage.ru_stime.tv_usec); | |
496 | printf_filtered ("utime, children: %jd.%06ld\n", | |
497 | (intmax_t) kp.ki_rusage_ch.ru_utime.tv_sec, | |
498 | kp.ki_rusage_ch.ru_utime.tv_usec); | |
499 | printf_filtered ("stime, children: %jd.%06ld\n", | |
500 | (intmax_t) kp.ki_rusage_ch.ru_stime.tv_sec, | |
501 | kp.ki_rusage_ch.ru_stime.tv_usec); | |
502 | printf_filtered ("'nice' value: %d\n", kp.ki_nice); | |
503 | printf_filtered ("Start time: %jd.%06ld\n", kp.ki_start.tv_sec, | |
504 | kp.ki_start.tv_usec); | |
505 | pgtok = getpagesize () / 1024; | |
506 | printf_filtered ("Virtual memory size: %ju kB\n", | |
507 | (uintmax_t) kp.ki_size / 1024); | |
508 | printf_filtered ("Data size: %ju kB\n", | |
509 | (uintmax_t) kp.ki_dsize * pgtok); | |
510 | printf_filtered ("Stack size: %ju kB\n", | |
511 | (uintmax_t) kp.ki_ssize * pgtok); | |
512 | printf_filtered ("Text size: %ju kB\n", | |
513 | (uintmax_t) kp.ki_tsize * pgtok); | |
514 | printf_filtered ("Resident set size: %ju kB\n", | |
515 | (uintmax_t) kp.ki_rssize * pgtok); | |
516 | printf_filtered ("Maximum RSS: %ju kB\n", | |
517 | (uintmax_t) kp.ki_rusage.ru_maxrss); | |
518 | printf_filtered ("Pending Signals: "); | |
519 | for (int i = 0; i < _SIG_WORDS; i++) | |
520 | printf_filtered ("%08x ", kp.ki_siglist.__bits[i]); | |
521 | printf_filtered ("\n"); | |
522 | printf_filtered ("Ignored Signals: "); | |
523 | for (int i = 0; i < _SIG_WORDS; i++) | |
524 | printf_filtered ("%08x ", kp.ki_sigignore.__bits[i]); | |
525 | printf_filtered ("\n"); | |
526 | printf_filtered ("Caught Signals: "); | |
527 | for (int i = 0; i < _SIG_WORDS; i++) | |
528 | printf_filtered ("%08x ", kp.ki_sigcatch.__bits[i]); | |
529 | printf_filtered ("\n"); | |
530 | } | |
531 | } | |
f6ac5f3d PA |
532 | |
533 | return true; | |
92fce24d JB |
534 | } |
535 | ||
7697fc9e | 536 | #ifdef KERN_PROC_AUXV |
7697fc9e | 537 | |
929edea9 JB |
538 | #ifdef PT_LWPINFO |
539 | /* Return the size of siginfo for the current inferior. */ | |
540 | ||
541 | #ifdef __LP64__ | |
542 | union sigval32 { | |
543 | int sival_int; | |
544 | uint32_t sival_ptr; | |
545 | }; | |
546 | ||
547 | /* This structure matches the naming and layout of `siginfo_t' in | |
548 | <sys/signal.h>. In particular, the `si_foo' macros defined in that | |
549 | header can be used with both types to copy fields in the `_reason' | |
550 | union. */ | |
551 | ||
552 | struct siginfo32 | |
553 | { | |
554 | int si_signo; | |
555 | int si_errno; | |
556 | int si_code; | |
557 | __pid_t si_pid; | |
558 | __uid_t si_uid; | |
559 | int si_status; | |
560 | uint32_t si_addr; | |
561 | union sigval32 si_value; | |
562 | union | |
563 | { | |
564 | struct | |
565 | { | |
566 | int _trapno; | |
567 | } _fault; | |
568 | struct | |
569 | { | |
570 | int _timerid; | |
571 | int _overrun; | |
572 | } _timer; | |
573 | struct | |
574 | { | |
575 | int _mqd; | |
576 | } _mesgq; | |
577 | struct | |
578 | { | |
579 | int32_t _band; | |
580 | } _poll; | |
581 | struct | |
582 | { | |
583 | int32_t __spare1__; | |
584 | int __spare2__[7]; | |
585 | } __spare__; | |
586 | } _reason; | |
587 | }; | |
588 | #endif | |
589 | ||
590 | static size_t | |
591 | fbsd_siginfo_size () | |
592 | { | |
593 | #ifdef __LP64__ | |
594 | struct gdbarch *gdbarch = get_frame_arch (get_current_frame ()); | |
595 | ||
596 | /* Is the inferior 32-bit? If so, use the 32-bit siginfo size. */ | |
a181c0bf | 597 | if (gdbarch_long_bit (gdbarch) == 32) |
929edea9 JB |
598 | return sizeof (struct siginfo32); |
599 | #endif | |
600 | return sizeof (siginfo_t); | |
601 | } | |
602 | ||
603 | /* Convert a native 64-bit siginfo object to a 32-bit object. Note | |
604 | that FreeBSD doesn't support writing to $_siginfo, so this only | |
605 | needs to convert one way. */ | |
606 | ||
607 | static void | |
608 | fbsd_convert_siginfo (siginfo_t *si) | |
609 | { | |
610 | #ifdef __LP64__ | |
611 | struct gdbarch *gdbarch = get_frame_arch (get_current_frame ()); | |
612 | ||
613 | /* Is the inferior 32-bit? If not, nothing to do. */ | |
a181c0bf | 614 | if (gdbarch_long_bit (gdbarch) != 32) |
929edea9 JB |
615 | return; |
616 | ||
617 | struct siginfo32 si32; | |
618 | ||
619 | si32.si_signo = si->si_signo; | |
620 | si32.si_errno = si->si_errno; | |
621 | si32.si_code = si->si_code; | |
622 | si32.si_pid = si->si_pid; | |
623 | si32.si_uid = si->si_uid; | |
624 | si32.si_status = si->si_status; | |
625 | si32.si_addr = (uintptr_t) si->si_addr; | |
626 | ||
627 | /* If sival_ptr is being used instead of sival_int on a big-endian | |
628 | platform, then sival_int will be zero since it holds the upper | |
629 | 32-bits of the pointer value. */ | |
630 | #if _BYTE_ORDER == _BIG_ENDIAN | |
631 | if (si->si_value.sival_int == 0) | |
0335ac6d | 632 | si32.si_value.sival_ptr = (uintptr_t) si->si_value.sival_ptr; |
929edea9 JB |
633 | else |
634 | si32.si_value.sival_int = si->si_value.sival_int; | |
635 | #else | |
636 | si32.si_value.sival_int = si->si_value.sival_int; | |
637 | #endif | |
638 | ||
639 | /* Always copy the spare fields and then possibly overwrite them for | |
640 | signal-specific or code-specific fields. */ | |
641 | si32._reason.__spare__.__spare1__ = si->_reason.__spare__.__spare1__; | |
642 | for (int i = 0; i < 7; i++) | |
643 | si32._reason.__spare__.__spare2__[i] = si->_reason.__spare__.__spare2__[i]; | |
644 | switch (si->si_signo) { | |
645 | case SIGILL: | |
646 | case SIGFPE: | |
647 | case SIGSEGV: | |
648 | case SIGBUS: | |
649 | si32.si_trapno = si->si_trapno; | |
650 | break; | |
651 | } | |
652 | switch (si->si_code) { | |
653 | case SI_TIMER: | |
654 | si32.si_timerid = si->si_timerid; | |
655 | si32.si_overrun = si->si_overrun; | |
656 | break; | |
657 | case SI_MESGQ: | |
658 | si32.si_mqd = si->si_mqd; | |
659 | break; | |
660 | } | |
661 | ||
662 | memcpy(si, &si32, sizeof (si32)); | |
663 | #endif | |
664 | } | |
665 | #endif | |
666 | ||
f6ac5f3d | 667 | /* Implement the "xfer_partial" target_ops method. */ |
7697fc9e | 668 | |
f6ac5f3d PA |
669 | enum target_xfer_status |
670 | fbsd_nat_target::xfer_partial (enum target_object object, | |
671 | const char *annex, gdb_byte *readbuf, | |
672 | const gdb_byte *writebuf, | |
673 | ULONGEST offset, ULONGEST len, | |
674 | ULONGEST *xfered_len) | |
7697fc9e | 675 | { |
e99b03dc | 676 | pid_t pid = inferior_ptid.pid (); |
7697fc9e JB |
677 | |
678 | switch (object) | |
679 | { | |
929edea9 JB |
680 | #ifdef PT_LWPINFO |
681 | case TARGET_OBJECT_SIGNAL_INFO: | |
682 | { | |
683 | struct ptrace_lwpinfo pl; | |
684 | size_t siginfo_size; | |
685 | ||
686 | /* FreeBSD doesn't support writing to $_siginfo. */ | |
687 | if (writebuf != NULL) | |
688 | return TARGET_XFER_E_IO; | |
689 | ||
690 | if (inferior_ptid.lwp_p ()) | |
691 | pid = inferior_ptid.lwp (); | |
692 | ||
693 | siginfo_size = fbsd_siginfo_size (); | |
694 | if (offset > siginfo_size) | |
695 | return TARGET_XFER_E_IO; | |
696 | ||
697 | if (ptrace (PT_LWPINFO, pid, (PTRACE_TYPE_ARG3) &pl, sizeof (pl)) == -1) | |
698 | return TARGET_XFER_E_IO; | |
699 | ||
700 | if (!(pl.pl_flags & PL_FLAG_SI)) | |
701 | return TARGET_XFER_E_IO; | |
702 | ||
703 | fbsd_convert_siginfo (&pl.pl_siginfo); | |
704 | if (offset + len > siginfo_size) | |
705 | len = siginfo_size - offset; | |
706 | ||
707 | memcpy (readbuf, ((gdb_byte *) &pl.pl_siginfo) + offset, len); | |
708 | *xfered_len = len; | |
709 | return TARGET_XFER_OK; | |
710 | } | |
711 | #endif | |
7697fc9e JB |
712 | case TARGET_OBJECT_AUXV: |
713 | { | |
e4a26669 JB |
714 | gdb::byte_vector buf_storage; |
715 | gdb_byte *buf; | |
7697fc9e JB |
716 | size_t buflen; |
717 | int mib[4]; | |
718 | ||
719 | if (writebuf != NULL) | |
720 | return TARGET_XFER_E_IO; | |
721 | mib[0] = CTL_KERN; | |
722 | mib[1] = KERN_PROC; | |
723 | mib[2] = KERN_PROC_AUXV; | |
724 | mib[3] = pid; | |
725 | if (offset == 0) | |
726 | { | |
727 | buf = readbuf; | |
728 | buflen = len; | |
729 | } | |
730 | else | |
731 | { | |
732 | buflen = offset + len; | |
e4a26669 JB |
733 | buf_storage.resize (buflen); |
734 | buf = buf_storage.data (); | |
7697fc9e JB |
735 | } |
736 | if (sysctl (mib, 4, buf, &buflen, NULL, 0) == 0) | |
737 | { | |
738 | if (offset != 0) | |
739 | { | |
740 | if (buflen > offset) | |
741 | { | |
742 | buflen -= offset; | |
743 | memcpy (readbuf, buf + offset, buflen); | |
744 | } | |
745 | else | |
746 | buflen = 0; | |
747 | } | |
7697fc9e JB |
748 | *xfered_len = buflen; |
749 | return (buflen == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; | |
750 | } | |
7697fc9e JB |
751 | return TARGET_XFER_E_IO; |
752 | } | |
739ab2e9 SS |
753 | case TARGET_OBJECT_FREEBSD_VMMAP: |
754 | case TARGET_OBJECT_FREEBSD_PS_STRINGS: | |
755 | { | |
756 | gdb::byte_vector buf_storage; | |
757 | gdb_byte *buf; | |
758 | size_t buflen; | |
759 | int mib[4]; | |
760 | ||
761 | int proc_target; | |
762 | uint32_t struct_size; | |
763 | switch (object) | |
764 | { | |
765 | case TARGET_OBJECT_FREEBSD_VMMAP: | |
766 | proc_target = KERN_PROC_VMMAP; | |
767 | struct_size = sizeof (struct kinfo_vmentry); | |
768 | break; | |
769 | case TARGET_OBJECT_FREEBSD_PS_STRINGS: | |
770 | proc_target = KERN_PROC_PS_STRINGS; | |
771 | struct_size = sizeof (void *); | |
772 | break; | |
773 | } | |
774 | ||
775 | if (writebuf != NULL) | |
776 | return TARGET_XFER_E_IO; | |
777 | ||
778 | mib[0] = CTL_KERN; | |
779 | mib[1] = KERN_PROC; | |
780 | mib[2] = proc_target; | |
781 | mib[3] = pid; | |
782 | ||
783 | if (sysctl (mib, 4, NULL, &buflen, NULL, 0) != 0) | |
784 | return TARGET_XFER_E_IO; | |
785 | buflen += sizeof (struct_size); | |
786 | ||
787 | if (offset >= buflen) | |
788 | { | |
789 | *xfered_len = 0; | |
790 | return TARGET_XFER_EOF; | |
791 | } | |
792 | ||
793 | buf_storage.resize (buflen); | |
794 | buf = buf_storage.data (); | |
795 | ||
796 | memcpy (buf, &struct_size, sizeof (struct_size)); | |
797 | buflen -= sizeof (struct_size); | |
798 | if (sysctl (mib, 4, buf + sizeof (struct_size), &buflen, NULL, 0) != 0) | |
799 | return TARGET_XFER_E_IO; | |
800 | buflen += sizeof (struct_size); | |
801 | ||
802 | if (buflen - offset < len) | |
803 | len = buflen - offset; | |
804 | memcpy (readbuf, buf + offset, len); | |
805 | *xfered_len = len; | |
806 | return TARGET_XFER_OK; | |
807 | } | |
7697fc9e | 808 | default: |
f6ac5f3d PA |
809 | return inf_ptrace_target::xfer_partial (object, annex, |
810 | readbuf, writebuf, offset, | |
811 | len, xfered_len); | |
7697fc9e JB |
812 | } |
813 | } | |
814 | #endif | |
815 | ||
e58e05d6 | 816 | #ifdef PT_LWPINFO |
6e9567fe | 817 | static int debug_fbsd_lwp; |
386a8676 | 818 | static int debug_fbsd_nat; |
6e9567fe | 819 | |
6e9567fe JB |
820 | static void |
821 | show_fbsd_lwp_debug (struct ui_file *file, int from_tty, | |
822 | struct cmd_list_element *c, const char *value) | |
823 | { | |
824 | fprintf_filtered (file, _("Debugging of FreeBSD lwp module is %s.\n"), value); | |
825 | } | |
826 | ||
386a8676 JB |
827 | static void |
828 | show_fbsd_nat_debug (struct ui_file *file, int from_tty, | |
829 | struct cmd_list_element *c, const char *value) | |
830 | { | |
831 | fprintf_filtered (file, _("Debugging of FreeBSD native target is %s.\n"), | |
832 | value); | |
833 | } | |
834 | ||
6e9567fe JB |
835 | /* |
836 | FreeBSD's first thread support was via a "reentrant" version of libc | |
837 | (libc_r) that first shipped in 2.2.7. This library multiplexed all | |
838 | of the threads in a process onto a single kernel thread. This | |
4c7bf4f9 | 839 | library was supported via the bsd-uthread target. |
6e9567fe JB |
840 | |
841 | FreeBSD 5.1 introduced two new threading libraries that made use of | |
842 | multiple kernel threads. The first (libkse) scheduled M user | |
843 | threads onto N (<= M) kernel threads (LWPs). The second (libthr) | |
844 | bound each user thread to a dedicated kernel thread. libkse shipped | |
845 | as the default threading library (libpthread). | |
846 | ||
847 | FreeBSD 5.3 added a libthread_db to abstract the interface across | |
848 | the various thread libraries (libc_r, libkse, and libthr). | |
849 | ||
850 | FreeBSD 7.0 switched the default threading library from from libkse | |
851 | to libpthread and removed libc_r. | |
852 | ||
853 | FreeBSD 8.0 removed libkse and the in-kernel support for it. The | |
854 | only threading library supported by 8.0 and later is libthr which | |
855 | ties each user thread directly to an LWP. To simplify the | |
856 | implementation, this target only supports LWP-backed threads using | |
857 | ptrace directly rather than libthread_db. | |
858 | ||
859 | FreeBSD 11.0 introduced LWP event reporting via PT_LWP_EVENTS. | |
860 | */ | |
861 | ||
862 | /* Return true if PTID is still active in the inferior. */ | |
863 | ||
57810aa7 | 864 | bool |
f6ac5f3d | 865 | fbsd_nat_target::thread_alive (ptid_t ptid) |
6e9567fe | 866 | { |
15a9e13e | 867 | if (ptid.lwp_p ()) |
6e9567fe JB |
868 | { |
869 | struct ptrace_lwpinfo pl; | |
870 | ||
e38504b3 | 871 | if (ptrace (PT_LWPINFO, ptid.lwp (), (caddr_t) &pl, sizeof pl) |
6e9567fe | 872 | == -1) |
57810aa7 | 873 | return false; |
6e9567fe JB |
874 | #ifdef PL_FLAG_EXITED |
875 | if (pl.pl_flags & PL_FLAG_EXITED) | |
57810aa7 | 876 | return false; |
6e9567fe JB |
877 | #endif |
878 | } | |
879 | ||
57810aa7 | 880 | return true; |
6e9567fe JB |
881 | } |
882 | ||
883 | /* Convert PTID to a string. Returns the string in a static | |
884 | buffer. */ | |
885 | ||
f6ac5f3d PA |
886 | const char * |
887 | fbsd_nat_target::pid_to_str (ptid_t ptid) | |
6e9567fe JB |
888 | { |
889 | lwpid_t lwp; | |
890 | ||
e38504b3 | 891 | lwp = ptid.lwp (); |
6e9567fe JB |
892 | if (lwp != 0) |
893 | { | |
894 | static char buf[64]; | |
e99b03dc | 895 | int pid = ptid.pid (); |
6e9567fe | 896 | |
b2bae2f7 | 897 | xsnprintf (buf, sizeof buf, "LWP %d of process %d", lwp, pid); |
6e9567fe JB |
898 | return buf; |
899 | } | |
900 | ||
901 | return normal_pid_to_str (ptid); | |
902 | } | |
903 | ||
904 | #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME | |
905 | /* Return the name assigned to a thread by an application. Returns | |
906 | the string in a static buffer. */ | |
907 | ||
f6ac5f3d PA |
908 | const char * |
909 | fbsd_nat_target::thread_name (struct thread_info *thr) | |
6e9567fe JB |
910 | { |
911 | struct ptrace_lwpinfo pl; | |
912 | struct kinfo_proc kp; | |
e99b03dc | 913 | int pid = thr->ptid.pid (); |
e38504b3 | 914 | long lwp = thr->ptid.lwp (); |
6e9567fe JB |
915 | static char buf[sizeof pl.pl_tdname + 1]; |
916 | ||
917 | /* Note that ptrace_lwpinfo returns the process command in pl_tdname | |
918 | if a name has not been set explicitly. Return a NULL name in | |
919 | that case. */ | |
92fce24d JB |
920 | if (!fbsd_fetch_kinfo_proc (pid, &kp)) |
921 | perror_with_name (_("Failed to fetch process information")); | |
6e9567fe JB |
922 | if (ptrace (PT_LWPINFO, lwp, (caddr_t) &pl, sizeof pl) == -1) |
923 | perror_with_name (("ptrace")); | |
924 | if (strcmp (kp.ki_comm, pl.pl_tdname) == 0) | |
925 | return NULL; | |
926 | xsnprintf (buf, sizeof buf, "%s", pl.pl_tdname); | |
927 | return buf; | |
928 | } | |
929 | #endif | |
930 | ||
da95a26c | 931 | /* Enable additional event reporting on new processes. |
6e9567fe | 932 | |
da95a26c JB |
933 | To catch fork events, PTRACE_FORK is set on every traced process |
934 | to enable stops on returns from fork or vfork. Note that both the | |
935 | parent and child will always stop, even if system call stops are | |
936 | not enabled. | |
937 | ||
938 | To catch LWP events, PTRACE_EVENTS is set on every traced process. | |
6e9567fe JB |
939 | This enables stops on the birth for new LWPs (excluding the "main" LWP) |
940 | and the death of LWPs (excluding the last LWP in a process). Note | |
941 | that unlike fork events, the LWP that creates a new LWP does not | |
942 | report an event. */ | |
943 | ||
944 | static void | |
da95a26c | 945 | fbsd_enable_proc_events (pid_t pid) |
6e9567fe | 946 | { |
da95a26c JB |
947 | #ifdef PT_GET_EVENT_MASK |
948 | int events; | |
949 | ||
950 | if (ptrace (PT_GET_EVENT_MASK, pid, (PTRACE_TYPE_ARG3)&events, | |
951 | sizeof (events)) == -1) | |
952 | perror_with_name (("ptrace")); | |
953 | events |= PTRACE_FORK | PTRACE_LWP; | |
dbaed385 JB |
954 | #ifdef PTRACE_VFORK |
955 | events |= PTRACE_VFORK; | |
956 | #endif | |
da95a26c JB |
957 | if (ptrace (PT_SET_EVENT_MASK, pid, (PTRACE_TYPE_ARG3)&events, |
958 | sizeof (events)) == -1) | |
959 | perror_with_name (("ptrace")); | |
960 | #else | |
961 | #ifdef TDP_RFPPWAIT | |
962 | if (ptrace (PT_FOLLOW_FORK, pid, (PTRACE_TYPE_ARG3)0, 1) == -1) | |
963 | perror_with_name (("ptrace")); | |
964 | #endif | |
965 | #ifdef PT_LWP_EVENTS | |
6e9567fe JB |
966 | if (ptrace (PT_LWP_EVENTS, pid, (PTRACE_TYPE_ARG3)0, 1) == -1) |
967 | perror_with_name (("ptrace")); | |
6e9567fe | 968 | #endif |
da95a26c JB |
969 | #endif |
970 | } | |
6e9567fe JB |
971 | |
972 | /* Add threads for any new LWPs in a process. | |
973 | ||
974 | When LWP events are used, this function is only used to detect existing | |
975 | threads when attaching to a process. On older systems, this function is | |
976 | called to discover new threads each time the thread list is updated. */ | |
977 | ||
978 | static void | |
979 | fbsd_add_threads (pid_t pid) | |
980 | { | |
6e9567fe JB |
981 | int i, nlwps; |
982 | ||
f2907e49 | 983 | gdb_assert (!in_thread_list (ptid_t (pid))); |
6e9567fe JB |
984 | nlwps = ptrace (PT_GETNUMLWPS, pid, NULL, 0); |
985 | if (nlwps == -1) | |
986 | perror_with_name (("ptrace")); | |
987 | ||
329d5e7e | 988 | gdb::unique_xmalloc_ptr<lwpid_t[]> lwps (XCNEWVEC (lwpid_t, nlwps)); |
6e9567fe | 989 | |
e4a26669 | 990 | nlwps = ptrace (PT_GETLWPLIST, pid, (caddr_t) lwps.get (), nlwps); |
6e9567fe JB |
991 | if (nlwps == -1) |
992 | perror_with_name (("ptrace")); | |
993 | ||
994 | for (i = 0; i < nlwps; i++) | |
995 | { | |
fd79271b | 996 | ptid_t ptid = ptid_t (pid, lwps[i], 0); |
6e9567fe JB |
997 | |
998 | if (!in_thread_list (ptid)) | |
999 | { | |
1000 | #ifdef PT_LWP_EVENTS | |
1001 | struct ptrace_lwpinfo pl; | |
1002 | ||
1003 | /* Don't add exited threads. Note that this is only called | |
1004 | when attaching to a multi-threaded process. */ | |
329d5e7e | 1005 | if (ptrace (PT_LWPINFO, lwps[i], (caddr_t) &pl, sizeof pl) == -1) |
6e9567fe JB |
1006 | perror_with_name (("ptrace")); |
1007 | if (pl.pl_flags & PL_FLAG_EXITED) | |
1008 | continue; | |
1009 | #endif | |
1010 | if (debug_fbsd_lwp) | |
1011 | fprintf_unfiltered (gdb_stdlog, | |
1012 | "FLWP: adding thread for LWP %u\n", | |
329d5e7e | 1013 | lwps[i]); |
6e9567fe JB |
1014 | add_thread (ptid); |
1015 | } | |
1016 | } | |
6e9567fe JB |
1017 | } |
1018 | ||
f6ac5f3d | 1019 | /* Implement the "update_thread_list" target_ops method. */ |
6e9567fe | 1020 | |
f6ac5f3d PA |
1021 | void |
1022 | fbsd_nat_target::update_thread_list () | |
6e9567fe JB |
1023 | { |
1024 | #ifdef PT_LWP_EVENTS | |
1025 | /* With support for thread events, threads are added/deleted from the | |
1026 | list as events are reported, so just try deleting exited threads. */ | |
1027 | delete_exited_threads (); | |
1028 | #else | |
1029 | prune_threads (); | |
1030 | ||
e99b03dc | 1031 | fbsd_add_threads (inferior_ptid.pid ()); |
6e9567fe JB |
1032 | #endif |
1033 | } | |
1034 | ||
e58e05d6 JB |
1035 | #ifdef TDP_RFPPWAIT |
1036 | /* | |
1037 | To catch fork events, PT_FOLLOW_FORK is set on every traced process | |
1038 | to enable stops on returns from fork or vfork. Note that both the | |
1039 | parent and child will always stop, even if system call stops are not | |
1040 | enabled. | |
1041 | ||
1042 | After a fork, both the child and parent process will stop and report | |
1043 | an event. However, there is no guarantee of order. If the parent | |
1044 | reports its stop first, then fbsd_wait explicitly waits for the new | |
1045 | child before returning. If the child reports its stop first, then | |
1046 | the event is saved on a list and ignored until the parent's stop is | |
1047 | reported. fbsd_wait could have been changed to fetch the parent PID | |
1048 | of the new child and used that to wait for the parent explicitly. | |
1049 | However, if two threads in the parent fork at the same time, then | |
1050 | the wait on the parent might return the "wrong" fork event. | |
1051 | ||
1052 | The initial version of PT_FOLLOW_FORK did not set PL_FLAG_CHILD for | |
1053 | the new child process. This flag could be inferred by treating any | |
1054 | events for an unknown pid as a new child. | |
1055 | ||
1056 | In addition, the initial version of PT_FOLLOW_FORK did not report a | |
1057 | stop event for the parent process of a vfork until after the child | |
1058 | process executed a new program or exited. The kernel was changed to | |
1059 | defer the wait for exit or exec of the child until after posting the | |
1060 | stop event shortly after the change to introduce PL_FLAG_CHILD. | |
1061 | This could be worked around by reporting a vfork event when the | |
1062 | child event posted and ignoring the subsequent event from the | |
1063 | parent. | |
1064 | ||
1065 | This implementation requires both of these fixes for simplicity's | |
1066 | sake. FreeBSD versions newer than 9.1 contain both fixes. | |
1067 | */ | |
1068 | ||
e8c6b620 | 1069 | static std::list<ptid_t> fbsd_pending_children; |
e58e05d6 JB |
1070 | |
1071 | /* Record a new child process event that is reported before the | |
1072 | corresponding fork event in the parent. */ | |
1073 | ||
1074 | static void | |
6e9567fe | 1075 | fbsd_remember_child (ptid_t pid) |
e58e05d6 | 1076 | { |
e8c6b620 | 1077 | fbsd_pending_children.push_front (pid); |
e58e05d6 JB |
1078 | } |
1079 | ||
1080 | /* Check for a previously-recorded new child process event for PID. | |
6e9567fe | 1081 | If one is found, remove it from the list and return the PTID. */ |
e58e05d6 | 1082 | |
6e9567fe | 1083 | static ptid_t |
e58e05d6 JB |
1084 | fbsd_is_child_pending (pid_t pid) |
1085 | { | |
e8c6b620 JB |
1086 | for (auto it = fbsd_pending_children.begin (); |
1087 | it != fbsd_pending_children.end (); it++) | |
1088 | if (it->pid () == pid) | |
1089 | { | |
1090 | ptid_t ptid = *it; | |
1091 | fbsd_pending_children.erase (it); | |
1092 | return ptid; | |
1093 | } | |
6e9567fe | 1094 | return null_ptid; |
e58e05d6 | 1095 | } |
2c5c2a33 | 1096 | |
dbaed385 | 1097 | #ifndef PTRACE_VFORK |
e8c6b620 | 1098 | static std::forward_list<ptid_t> fbsd_pending_vfork_done; |
2c5c2a33 JB |
1099 | |
1100 | /* Record a pending vfork done event. */ | |
1101 | ||
1102 | static void | |
1103 | fbsd_add_vfork_done (ptid_t pid) | |
1104 | { | |
e8c6b620 | 1105 | fbsd_pending_vfork_done.push_front (pid); |
2c5c2a33 JB |
1106 | } |
1107 | ||
1108 | /* Check for a pending vfork done event for a specific PID. */ | |
1109 | ||
1110 | static int | |
1111 | fbsd_is_vfork_done_pending (pid_t pid) | |
1112 | { | |
e8c6b620 JB |
1113 | for (auto it = fbsd_pending_vfork_done.begin (); |
1114 | it != fbsd_pending_vfork_done.end (); it++) | |
1115 | if (it->pid () == pid) | |
1116 | return 1; | |
2c5c2a33 JB |
1117 | return 0; |
1118 | } | |
1119 | ||
1120 | /* Check for a pending vfork done event. If one is found, remove it | |
1121 | from the list and return the PTID. */ | |
1122 | ||
ee950322 | 1123 | static ptid_t |
2c5c2a33 JB |
1124 | fbsd_next_vfork_done (void) |
1125 | { | |
e8c6b620 | 1126 | if (!fbsd_pending_vfork_done.empty ()) |
2c5c2a33 | 1127 | { |
e8c6b620 JB |
1128 | ptid_t ptid = fbsd_pending_vfork_done.front (); |
1129 | fbsd_pending_vfork_done.pop_front (); | |
2c5c2a33 JB |
1130 | return ptid; |
1131 | } | |
1132 | return null_ptid; | |
1133 | } | |
e58e05d6 | 1134 | #endif |
dbaed385 | 1135 | #endif |
e58e05d6 | 1136 | |
f6ac5f3d | 1137 | /* Implement the "resume" target_ops method. */ |
8607ea63 | 1138 | |
f6ac5f3d PA |
1139 | void |
1140 | fbsd_nat_target::resume (ptid_t ptid, int step, enum gdb_signal signo) | |
8607ea63 | 1141 | { |
dbaed385 | 1142 | #if defined(TDP_RFPPWAIT) && !defined(PTRACE_VFORK) |
2c5c2a33 JB |
1143 | pid_t pid; |
1144 | ||
1145 | /* Don't PT_CONTINUE a process which has a pending vfork done event. */ | |
d7e15655 | 1146 | if (minus_one_ptid == ptid) |
e99b03dc | 1147 | pid = inferior_ptid.pid (); |
2c5c2a33 | 1148 | else |
e99b03dc | 1149 | pid = ptid.pid (); |
2c5c2a33 JB |
1150 | if (fbsd_is_vfork_done_pending (pid)) |
1151 | return; | |
1152 | #endif | |
8607ea63 JB |
1153 | |
1154 | if (debug_fbsd_lwp) | |
1155 | fprintf_unfiltered (gdb_stdlog, | |
1156 | "FLWP: fbsd_resume for ptid (%d, %ld, %ld)\n", | |
e38504b3 | 1157 | ptid.pid (), ptid.lwp (), |
cc6bcb54 | 1158 | ptid.tid ()); |
15a9e13e | 1159 | if (ptid.lwp_p ()) |
8607ea63 JB |
1160 | { |
1161 | /* If ptid is a specific LWP, suspend all other LWPs in the process. */ | |
d56060f0 JB |
1162 | struct thread_info *tp; |
1163 | int request; | |
1164 | ||
1165 | ALL_NON_EXITED_THREADS (tp) | |
1166 | { | |
e99b03dc | 1167 | if (tp->ptid.pid () != ptid.pid ()) |
d56060f0 JB |
1168 | continue; |
1169 | ||
e38504b3 | 1170 | if (tp->ptid.lwp () == ptid.lwp ()) |
d56060f0 JB |
1171 | request = PT_RESUME; |
1172 | else | |
1173 | request = PT_SUSPEND; | |
1174 | ||
e38504b3 | 1175 | if (ptrace (request, tp->ptid.lwp (), NULL, 0) == -1) |
d56060f0 JB |
1176 | perror_with_name (("ptrace")); |
1177 | } | |
8607ea63 JB |
1178 | } |
1179 | else | |
1180 | { | |
1181 | /* If ptid is a wildcard, resume all matching threads (they won't run | |
1182 | until the process is continued however). */ | |
d56060f0 JB |
1183 | struct thread_info *tp; |
1184 | ||
1185 | ALL_NON_EXITED_THREADS (tp) | |
1186 | { | |
26a57c92 | 1187 | if (!tp->ptid.matches (ptid)) |
d56060f0 JB |
1188 | continue; |
1189 | ||
e38504b3 | 1190 | if (ptrace (PT_RESUME, tp->ptid.lwp (), NULL, 0) == -1) |
d56060f0 JB |
1191 | perror_with_name (("ptrace")); |
1192 | } | |
8607ea63 JB |
1193 | ptid = inferior_ptid; |
1194 | } | |
f169cfdc JB |
1195 | |
1196 | #if __FreeBSD_version < 1200052 | |
1197 | /* When multiple threads within a process wish to report STOPPED | |
1198 | events from wait(), the kernel picks one thread event as the | |
1199 | thread event to report. The chosen thread event is retrieved via | |
1200 | PT_LWPINFO by passing the process ID as the request pid. If | |
1201 | multiple events are pending, then the subsequent wait() after | |
1202 | resuming a process will report another STOPPED event after | |
1203 | resuming the process to handle the next thread event and so on. | |
1204 | ||
1205 | A single thread event is cleared as a side effect of resuming the | |
1206 | process with PT_CONTINUE, PT_STEP, etc. In older kernels, | |
1207 | however, the request pid was used to select which thread's event | |
1208 | was cleared rather than always clearing the event that was just | |
1209 | reported. To avoid clearing the event of the wrong LWP, always | |
1210 | pass the process ID instead of an LWP ID to PT_CONTINUE or | |
1211 | PT_SYSCALL. | |
1212 | ||
1213 | In the case of stepping, the process ID cannot be used with | |
1214 | PT_STEP since it would step the thread that reported an event | |
1215 | which may not be the thread indicated by PTID. For stepping, use | |
1216 | PT_SETSTEP to enable stepping on the desired thread before | |
1217 | resuming the process via PT_CONTINUE instead of using | |
1218 | PT_STEP. */ | |
1219 | if (step) | |
1220 | { | |
1221 | if (ptrace (PT_SETSTEP, get_ptrace_pid (ptid), NULL, 0) == -1) | |
1222 | perror_with_name (("ptrace")); | |
1223 | step = 0; | |
1224 | } | |
1225 | ptid = ptid_t (ptid.pid ()); | |
1226 | #endif | |
f6ac5f3d | 1227 | inf_ptrace_target::resume (ptid, step, signo); |
8607ea63 JB |
1228 | } |
1229 | ||
7efba073 JB |
1230 | #ifdef USE_SIGTRAP_SIGINFO |
1231 | /* Handle breakpoint and trace traps reported via SIGTRAP. If the | |
1232 | trap was a breakpoint or trace trap that should be reported to the | |
1233 | core, return true. */ | |
1234 | ||
1235 | static bool | |
f6ac5f3d | 1236 | fbsd_handle_debug_trap (ptid_t ptid, const struct ptrace_lwpinfo &pl) |
7efba073 JB |
1237 | { |
1238 | ||
1239 | /* Ignore traps without valid siginfo or for signals other than | |
1240 | SIGTRAP. */ | |
1241 | if (! (pl.pl_flags & PL_FLAG_SI) || pl.pl_siginfo.si_signo != SIGTRAP) | |
1242 | return false; | |
1243 | ||
1244 | /* Trace traps are either a single step or a hardware watchpoint or | |
1245 | breakpoint. */ | |
1246 | if (pl.pl_siginfo.si_code == TRAP_TRACE) | |
1247 | { | |
1248 | if (debug_fbsd_nat) | |
1249 | fprintf_unfiltered (gdb_stdlog, | |
1250 | "FNAT: trace trap for LWP %ld\n", ptid.lwp ()); | |
1251 | return true; | |
1252 | } | |
1253 | ||
1254 | if (pl.pl_siginfo.si_code == TRAP_BRKPT) | |
1255 | { | |
1256 | /* Fixup PC for the software breakpoint. */ | |
1257 | struct regcache *regcache = get_thread_regcache (ptid); | |
1258 | struct gdbarch *gdbarch = regcache->arch (); | |
1259 | int decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
1260 | ||
1261 | if (debug_fbsd_nat) | |
1262 | fprintf_unfiltered (gdb_stdlog, | |
1263 | "FNAT: sw breakpoint trap for LWP %ld\n", | |
1264 | ptid.lwp ()); | |
1265 | if (decr_pc != 0) | |
1266 | { | |
1267 | CORE_ADDR pc; | |
1268 | ||
1269 | pc = regcache_read_pc (regcache); | |
1270 | regcache_write_pc (regcache, pc - decr_pc); | |
1271 | } | |
1272 | return true; | |
1273 | } | |
1274 | ||
1275 | return false; | |
1276 | } | |
1277 | #endif | |
1278 | ||
e58e05d6 JB |
1279 | /* Wait for the child specified by PTID to do something. Return the |
1280 | process ID of the child, or MINUS_ONE_PTID in case of error; store | |
1281 | the status in *OURSTATUS. */ | |
1282 | ||
f6ac5f3d PA |
1283 | ptid_t |
1284 | fbsd_nat_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus, | |
1285 | int target_options) | |
e58e05d6 JB |
1286 | { |
1287 | ptid_t wptid; | |
1288 | ||
1289 | while (1) | |
1290 | { | |
dbaed385 | 1291 | #ifndef PTRACE_VFORK |
2c5c2a33 | 1292 | wptid = fbsd_next_vfork_done (); |
d7e15655 | 1293 | if (wptid != null_ptid) |
2c5c2a33 JB |
1294 | { |
1295 | ourstatus->kind = TARGET_WAITKIND_VFORK_DONE; | |
1296 | return wptid; | |
1297 | } | |
dbaed385 | 1298 | #endif |
f6ac5f3d | 1299 | wptid = inf_ptrace_target::wait (ptid, ourstatus, target_options); |
e58e05d6 JB |
1300 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED) |
1301 | { | |
1302 | struct ptrace_lwpinfo pl; | |
1303 | pid_t pid; | |
1304 | int status; | |
1305 | ||
e99b03dc | 1306 | pid = wptid.pid (); |
6e9567fe | 1307 | if (ptrace (PT_LWPINFO, pid, (caddr_t) &pl, sizeof pl) == -1) |
e58e05d6 JB |
1308 | perror_with_name (("ptrace")); |
1309 | ||
fd79271b | 1310 | wptid = ptid_t (pid, pl.pl_lwpid, 0); |
6e9567fe | 1311 | |
386a8676 JB |
1312 | if (debug_fbsd_nat) |
1313 | { | |
1314 | fprintf_unfiltered (gdb_stdlog, | |
1315 | "FNAT: stop for LWP %u event %d flags %#x\n", | |
1316 | pl.pl_lwpid, pl.pl_event, pl.pl_flags); | |
1317 | if (pl.pl_flags & PL_FLAG_SI) | |
1318 | fprintf_unfiltered (gdb_stdlog, | |
1319 | "FNAT: si_signo %u si_code %u\n", | |
1320 | pl.pl_siginfo.si_signo, | |
1321 | pl.pl_siginfo.si_code); | |
1322 | } | |
1323 | ||
6e9567fe JB |
1324 | #ifdef PT_LWP_EVENTS |
1325 | if (pl.pl_flags & PL_FLAG_EXITED) | |
1326 | { | |
1327 | /* If GDB attaches to a multi-threaded process, exiting | |
f6ac5f3d | 1328 | threads might be skipped during post_attach that |
6e9567fe JB |
1329 | have not yet reported their PL_FLAG_EXITED event. |
1330 | Ignore EXITED events for an unknown LWP. */ | |
b7a08269 PA |
1331 | thread_info *thr = find_thread_ptid (wptid); |
1332 | if (thr != nullptr) | |
6e9567fe JB |
1333 | { |
1334 | if (debug_fbsd_lwp) | |
1335 | fprintf_unfiltered (gdb_stdlog, | |
1336 | "FLWP: deleting thread for LWP %u\n", | |
1337 | pl.pl_lwpid); | |
1338 | if (print_thread_events) | |
1339 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str | |
1340 | (wptid)); | |
b7a08269 | 1341 | delete_thread (thr); |
6e9567fe JB |
1342 | } |
1343 | if (ptrace (PT_CONTINUE, pid, (caddr_t) 1, 0) == -1) | |
1344 | perror_with_name (("ptrace")); | |
1345 | continue; | |
1346 | } | |
1347 | #endif | |
1348 | ||
1349 | /* Switch to an LWP PTID on the first stop in a new process. | |
1350 | This is done after handling PL_FLAG_EXITED to avoid | |
1351 | switching to an exited LWP. It is done before checking | |
1352 | PL_FLAG_BORN in case the first stop reported after | |
1353 | attaching to an existing process is a PL_FLAG_BORN | |
1354 | event. */ | |
f2907e49 | 1355 | if (in_thread_list (ptid_t (pid))) |
6e9567fe JB |
1356 | { |
1357 | if (debug_fbsd_lwp) | |
1358 | fprintf_unfiltered (gdb_stdlog, | |
1359 | "FLWP: using LWP %u for first thread\n", | |
1360 | pl.pl_lwpid); | |
f2907e49 | 1361 | thread_change_ptid (ptid_t (pid), wptid); |
6e9567fe JB |
1362 | } |
1363 | ||
1364 | #ifdef PT_LWP_EVENTS | |
1365 | if (pl.pl_flags & PL_FLAG_BORN) | |
1366 | { | |
1367 | /* If GDB attaches to a multi-threaded process, newborn | |
1368 | threads might be added by fbsd_add_threads that have | |
1369 | not yet reported their PL_FLAG_BORN event. Ignore | |
1370 | BORN events for an already-known LWP. */ | |
1371 | if (!in_thread_list (wptid)) | |
1372 | { | |
1373 | if (debug_fbsd_lwp) | |
1374 | fprintf_unfiltered (gdb_stdlog, | |
1375 | "FLWP: adding thread for LWP %u\n", | |
1376 | pl.pl_lwpid); | |
1377 | add_thread (wptid); | |
1378 | } | |
1379 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
1380 | return wptid; | |
1381 | } | |
1382 | #endif | |
1383 | ||
e58e05d6 JB |
1384 | #ifdef TDP_RFPPWAIT |
1385 | if (pl.pl_flags & PL_FLAG_FORKED) | |
1386 | { | |
dbaed385 | 1387 | #ifndef PTRACE_VFORK |
e58e05d6 | 1388 | struct kinfo_proc kp; |
dbaed385 | 1389 | #endif |
6e9567fe | 1390 | ptid_t child_ptid; |
e58e05d6 JB |
1391 | pid_t child; |
1392 | ||
1393 | child = pl.pl_child_pid; | |
1394 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
dbaed385 JB |
1395 | #ifdef PTRACE_VFORK |
1396 | if (pl.pl_flags & PL_FLAG_VFORKED) | |
1397 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
1398 | #endif | |
e58e05d6 JB |
1399 | |
1400 | /* Make sure the other end of the fork is stopped too. */ | |
6e9567fe | 1401 | child_ptid = fbsd_is_child_pending (child); |
d7e15655 | 1402 | if (child_ptid == null_ptid) |
e58e05d6 JB |
1403 | { |
1404 | pid = waitpid (child, &status, 0); | |
1405 | if (pid == -1) | |
1406 | perror_with_name (("waitpid")); | |
1407 | ||
1408 | gdb_assert (pid == child); | |
1409 | ||
1410 | if (ptrace (PT_LWPINFO, child, (caddr_t)&pl, sizeof pl) == -1) | |
1411 | perror_with_name (("ptrace")); | |
1412 | ||
1413 | gdb_assert (pl.pl_flags & PL_FLAG_CHILD); | |
fd79271b | 1414 | child_ptid = ptid_t (child, pl.pl_lwpid, 0); |
e58e05d6 JB |
1415 | } |
1416 | ||
5fa14c6b | 1417 | /* Enable additional events on the child process. */ |
e99b03dc | 1418 | fbsd_enable_proc_events (child_ptid.pid ()); |
5fa14c6b | 1419 | |
dbaed385 | 1420 | #ifndef PTRACE_VFORK |
e58e05d6 JB |
1421 | /* For vfork, the child process will have the P_PPWAIT |
1422 | flag set. */ | |
92fce24d JB |
1423 | if (fbsd_fetch_kinfo_proc (child, &kp)) |
1424 | { | |
1425 | if (kp.ki_flag & P_PPWAIT) | |
1426 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
1427 | } | |
1428 | else | |
1429 | warning (_("Failed to fetch process information")); | |
dbaed385 | 1430 | #endif |
6e9567fe | 1431 | ourstatus->value.related_pid = child_ptid; |
e58e05d6 JB |
1432 | |
1433 | return wptid; | |
1434 | } | |
1435 | ||
1436 | if (pl.pl_flags & PL_FLAG_CHILD) | |
1437 | { | |
1438 | /* Remember that this child forked, but do not report it | |
1439 | until the parent reports its corresponding fork | |
1440 | event. */ | |
6e9567fe | 1441 | fbsd_remember_child (wptid); |
e58e05d6 JB |
1442 | continue; |
1443 | } | |
dbaed385 JB |
1444 | |
1445 | #ifdef PTRACE_VFORK | |
1446 | if (pl.pl_flags & PL_FLAG_VFORK_DONE) | |
1447 | { | |
1448 | ourstatus->kind = TARGET_WAITKIND_VFORK_DONE; | |
1449 | return wptid; | |
1450 | } | |
1451 | #endif | |
e58e05d6 | 1452 | #endif |
d2b41ca0 JB |
1453 | |
1454 | #ifdef PL_FLAG_EXEC | |
1455 | if (pl.pl_flags & PL_FLAG_EXEC) | |
1456 | { | |
1457 | ourstatus->kind = TARGET_WAITKIND_EXECD; | |
1458 | ourstatus->value.execd_pathname | |
f6ac5f3d | 1459 | = xstrdup (pid_to_exec_file (pid)); |
d2b41ca0 JB |
1460 | return wptid; |
1461 | } | |
1462 | #endif | |
e6cdd38e | 1463 | |
7efba073 | 1464 | #ifdef USE_SIGTRAP_SIGINFO |
f6ac5f3d | 1465 | if (fbsd_handle_debug_trap (wptid, pl)) |
7efba073 JB |
1466 | return wptid; |
1467 | #endif | |
1468 | ||
e6cdd38e JB |
1469 | /* Note that PL_FLAG_SCE is set for any event reported while |
1470 | a thread is executing a system call in the kernel. In | |
1471 | particular, signals that interrupt a sleep in a system | |
1472 | call will report this flag as part of their event. Stops | |
1473 | explicitly for system call entry and exit always use | |
1474 | SIGTRAP, so only treat SIGTRAP events as system call | |
1475 | entry/exit events. */ | |
1476 | if (pl.pl_flags & (PL_FLAG_SCE | PL_FLAG_SCX) | |
1477 | && ourstatus->value.sig == SIGTRAP) | |
1478 | { | |
1479 | #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE | |
1480 | if (catch_syscall_enabled ()) | |
1481 | { | |
1482 | if (catching_syscall_number (pl.pl_syscall_code)) | |
1483 | { | |
1484 | if (pl.pl_flags & PL_FLAG_SCE) | |
1485 | ourstatus->kind = TARGET_WAITKIND_SYSCALL_ENTRY; | |
1486 | else | |
1487 | ourstatus->kind = TARGET_WAITKIND_SYSCALL_RETURN; | |
1488 | ourstatus->value.syscall_number = pl.pl_syscall_code; | |
1489 | return wptid; | |
1490 | } | |
1491 | } | |
1492 | #endif | |
1493 | /* If the core isn't interested in this event, just | |
1494 | continue the process explicitly and wait for another | |
1495 | event. Note that PT_SYSCALL is "sticky" on FreeBSD | |
1496 | and once system call stops are enabled on a process | |
1497 | it stops for all system call entries and exits. */ | |
1498 | if (ptrace (PT_CONTINUE, pid, (caddr_t) 1, 0) == -1) | |
1499 | perror_with_name (("ptrace")); | |
1500 | continue; | |
1501 | } | |
e58e05d6 JB |
1502 | } |
1503 | return wptid; | |
1504 | } | |
1505 | } | |
1506 | ||
7efba073 | 1507 | #ifdef USE_SIGTRAP_SIGINFO |
f6ac5f3d | 1508 | /* Implement the "stopped_by_sw_breakpoint" target_ops method. */ |
7efba073 | 1509 | |
57810aa7 | 1510 | bool |
f6ac5f3d | 1511 | fbsd_nat_target::stopped_by_sw_breakpoint () |
7efba073 JB |
1512 | { |
1513 | struct ptrace_lwpinfo pl; | |
1514 | ||
1515 | if (ptrace (PT_LWPINFO, get_ptrace_pid (inferior_ptid), (caddr_t) &pl, | |
1516 | sizeof pl) == -1) | |
57810aa7 | 1517 | return false; |
7efba073 JB |
1518 | |
1519 | return ((pl.pl_flags & PL_FLAG_SI) | |
1520 | && pl.pl_siginfo.si_signo == SIGTRAP | |
1521 | && pl.pl_siginfo.si_code == TRAP_BRKPT); | |
1522 | } | |
1523 | ||
f6ac5f3d | 1524 | /* Implement the "supports_stopped_by_sw_breakpoint" target_ops |
7efba073 JB |
1525 | method. */ |
1526 | ||
57810aa7 | 1527 | bool |
f6ac5f3d | 1528 | fbsd_nat_target::supports_stopped_by_sw_breakpoint () |
7efba073 | 1529 | { |
57810aa7 | 1530 | return true; |
7efba073 | 1531 | } |
7efba073 JB |
1532 | #endif |
1533 | ||
e58e05d6 JB |
1534 | #ifdef TDP_RFPPWAIT |
1535 | /* Target hook for follow_fork. On entry and at return inferior_ptid is | |
1536 | the ptid of the followed inferior. */ | |
1537 | ||
f6ac5f3d PA |
1538 | int |
1539 | fbsd_nat_target::follow_fork (int follow_child, int detach_fork) | |
e58e05d6 | 1540 | { |
bb2a62e6 | 1541 | if (!follow_child && detach_fork) |
e58e05d6 JB |
1542 | { |
1543 | struct thread_info *tp = inferior_thread (); | |
e99b03dc | 1544 | pid_t child_pid = tp->pending_follow.value.related_pid.pid (); |
e58e05d6 JB |
1545 | |
1546 | /* Breakpoints have already been detached from the child by | |
1547 | infrun.c. */ | |
1548 | ||
1549 | if (ptrace (PT_DETACH, child_pid, (PTRACE_TYPE_ARG3)1, 0) == -1) | |
1550 | perror_with_name (("ptrace")); | |
2c5c2a33 | 1551 | |
dbaed385 JB |
1552 | #ifndef PTRACE_VFORK |
1553 | if (tp->pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
2c5c2a33 JB |
1554 | { |
1555 | /* We can't insert breakpoints until the child process has | |
1556 | finished with the shared memory region. The parent | |
1557 | process doesn't wait for the child process to exit or | |
1558 | exec until after it has been resumed from the ptrace stop | |
1559 | to report the fork. Once it has been resumed it doesn't | |
1560 | stop again before returning to userland, so there is no | |
1561 | reliable way to wait on the parent. | |
1562 | ||
1563 | We can't stay attached to the child to wait for an exec | |
1564 | or exit because it may invoke ptrace(PT_TRACE_ME) | |
1565 | (e.g. if the parent process is a debugger forking a new | |
1566 | child process). | |
1567 | ||
1568 | In the end, the best we can do is to make sure it runs | |
1569 | for a little while. Hopefully it will be out of range of | |
1570 | any breakpoints we reinsert. Usually this is only the | |
1571 | single-step breakpoint at vfork's return point. */ | |
1572 | ||
1573 | usleep (10000); | |
1574 | ||
1575 | /* Schedule a fake VFORK_DONE event to report on the next | |
1576 | wait. */ | |
1577 | fbsd_add_vfork_done (inferior_ptid); | |
1578 | } | |
dbaed385 | 1579 | #endif |
e58e05d6 JB |
1580 | } |
1581 | ||
1582 | return 0; | |
1583 | } | |
1584 | ||
f6ac5f3d PA |
1585 | int |
1586 | fbsd_nat_target::insert_fork_catchpoint (int pid) | |
e58e05d6 JB |
1587 | { |
1588 | return 0; | |
1589 | } | |
1590 | ||
f6ac5f3d PA |
1591 | int |
1592 | fbsd_nat_target::remove_fork_catchpoint (int pid) | |
e58e05d6 JB |
1593 | { |
1594 | return 0; | |
1595 | } | |
1596 | ||
f6ac5f3d PA |
1597 | int |
1598 | fbsd_nat_target::insert_vfork_catchpoint (int pid) | |
e58e05d6 JB |
1599 | { |
1600 | return 0; | |
1601 | } | |
1602 | ||
f6ac5f3d PA |
1603 | int |
1604 | fbsd_nat_target::remove_vfork_catchpoint (int pid) | |
e58e05d6 JB |
1605 | { |
1606 | return 0; | |
1607 | } | |
6e9567fe | 1608 | #endif |
e58e05d6 | 1609 | |
f6ac5f3d | 1610 | /* Implement the "post_startup_inferior" target_ops method. */ |
e58e05d6 | 1611 | |
f6ac5f3d PA |
1612 | void |
1613 | fbsd_nat_target::post_startup_inferior (ptid_t pid) | |
e58e05d6 | 1614 | { |
e99b03dc | 1615 | fbsd_enable_proc_events (pid.pid ()); |
e58e05d6 JB |
1616 | } |
1617 | ||
f6ac5f3d | 1618 | /* Implement the "post_attach" target_ops method. */ |
e58e05d6 | 1619 | |
f6ac5f3d PA |
1620 | void |
1621 | fbsd_nat_target::post_attach (int pid) | |
e58e05d6 | 1622 | { |
da95a26c | 1623 | fbsd_enable_proc_events (pid); |
6e9567fe JB |
1624 | fbsd_add_threads (pid); |
1625 | } | |
d2b41ca0 JB |
1626 | |
1627 | #ifdef PL_FLAG_EXEC | |
1628 | /* If the FreeBSD kernel supports PL_FLAG_EXEC, then traced processes | |
1629 | will always stop after exec. */ | |
1630 | ||
f6ac5f3d PA |
1631 | int |
1632 | fbsd_nat_target::insert_exec_catchpoint (int pid) | |
d2b41ca0 JB |
1633 | { |
1634 | return 0; | |
1635 | } | |
1636 | ||
f6ac5f3d PA |
1637 | int |
1638 | fbsd_nat_target::remove_exec_catchpoint (int pid) | |
d2b41ca0 JB |
1639 | { |
1640 | return 0; | |
1641 | } | |
1642 | #endif | |
e6cdd38e JB |
1643 | |
1644 | #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE | |
f6ac5f3d PA |
1645 | int |
1646 | fbsd_nat_target::set_syscall_catchpoint (int pid, bool needed, | |
1647 | int any_count, | |
1648 | gdb::array_view<const int> syscall_counts) | |
e6cdd38e JB |
1649 | { |
1650 | ||
1651 | /* Ignore the arguments. inf-ptrace.c will use PT_SYSCALL which | |
1652 | will catch all system call entries and exits. The system calls | |
1653 | are filtered by GDB rather than the kernel. */ | |
1654 | return 0; | |
1655 | } | |
1656 | #endif | |
e58e05d6 JB |
1657 | #endif |
1658 | ||
6e9567fe JB |
1659 | void |
1660 | _initialize_fbsd_nat (void) | |
1661 | { | |
1662 | #ifdef PT_LWPINFO | |
1663 | add_setshow_boolean_cmd ("fbsd-lwp", class_maintenance, | |
1664 | &debug_fbsd_lwp, _("\ | |
1665 | Set debugging of FreeBSD lwp module."), _("\ | |
1666 | Show debugging of FreeBSD lwp module."), _("\ | |
1667 | Enables printf debugging output."), | |
1668 | NULL, | |
1669 | &show_fbsd_lwp_debug, | |
1670 | &setdebuglist, &showdebuglist); | |
386a8676 JB |
1671 | add_setshow_boolean_cmd ("fbsd-nat", class_maintenance, |
1672 | &debug_fbsd_nat, _("\ | |
1673 | Set debugging of FreeBSD native target."), _("\ | |
1674 | Show debugging of FreeBSD native target."), _("\ | |
1675 | Enables printf debugging output."), | |
1676 | NULL, | |
1677 | &show_fbsd_nat_debug, | |
1678 | &setdebuglist, &showdebuglist); | |
6e9567fe JB |
1679 | #endif |
1680 | } |