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1 | /* Native-dependent code for FreeBSD. | |
2 | ||
3 | Copyright (C) 2002-2021 Free Software Foundation, Inc. | |
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 | |
9 | the Free Software Foundation; either version 3 of the License, or | |
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 | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "gdbsupport/byte-vector.h" | |
22 | #include "gdbcore.h" | |
23 | #include "inferior.h" | |
24 | #include "regcache.h" | |
25 | #include "regset.h" | |
26 | #include "gdbarch.h" | |
27 | #include "gdbcmd.h" | |
28 | #include "gdbthread.h" | |
29 | #include "gdbsupport/gdb_wait.h" | |
30 | #include "inf-ptrace.h" | |
31 | #include <sys/types.h> | |
32 | #include <sys/procfs.h> | |
33 | #include <sys/ptrace.h> | |
34 | #include <sys/signal.h> | |
35 | #include <sys/sysctl.h> | |
36 | #include <sys/user.h> | |
37 | #include <libutil.h> | |
38 | ||
39 | #include "elf-bfd.h" | |
40 | #include "fbsd-nat.h" | |
41 | #include "fbsd-tdep.h" | |
42 | ||
43 | #include <list> | |
44 | ||
45 | /* Return the name of a file that can be opened to get the symbols for | |
46 | the child process identified by PID. */ | |
47 | ||
48 | char * | |
49 | fbsd_nat_target::pid_to_exec_file (int pid) | |
50 | { | |
51 | static char buf[PATH_MAX]; | |
52 | size_t buflen; | |
53 | int mib[4]; | |
54 | ||
55 | mib[0] = CTL_KERN; | |
56 | mib[1] = KERN_PROC; | |
57 | mib[2] = KERN_PROC_PATHNAME; | |
58 | mib[3] = pid; | |
59 | buflen = sizeof buf; | |
60 | if (sysctl (mib, 4, buf, &buflen, NULL, 0) == 0) | |
61 | /* The kern.proc.pathname.<pid> sysctl returns a length of zero | |
62 | for processes without an associated executable such as kernel | |
63 | processes. */ | |
64 | return buflen == 0 ? NULL : buf; | |
65 | ||
66 | return NULL; | |
67 | } | |
68 | ||
69 | /* Iterate over all the memory regions in the current inferior, | |
70 | calling FUNC for each memory region. DATA is passed as the last | |
71 | argument to FUNC. */ | |
72 | ||
73 | int | |
74 | fbsd_nat_target::find_memory_regions (find_memory_region_ftype func, | |
75 | void *data) | |
76 | { | |
77 | pid_t pid = inferior_ptid.pid (); | |
78 | struct kinfo_vmentry *kve; | |
79 | uint64_t size; | |
80 | int i, nitems; | |
81 | ||
82 | gdb::unique_xmalloc_ptr<struct kinfo_vmentry> | |
83 | vmentl (kinfo_getvmmap (pid, &nitems)); | |
84 | if (vmentl == NULL) | |
85 | perror_with_name (_("Couldn't fetch VM map entries.")); | |
86 | ||
87 | for (i = 0, kve = vmentl.get (); i < nitems; i++, kve++) | |
88 | { | |
89 | /* Skip unreadable segments and those where MAP_NOCORE has been set. */ | |
90 | if (!(kve->kve_protection & KVME_PROT_READ) | |
91 | || kve->kve_flags & KVME_FLAG_NOCOREDUMP) | |
92 | continue; | |
93 | ||
94 | /* Skip segments with an invalid type. */ | |
95 | if (kve->kve_type != KVME_TYPE_DEFAULT | |
96 | && kve->kve_type != KVME_TYPE_VNODE | |
97 | && kve->kve_type != KVME_TYPE_SWAP | |
98 | && kve->kve_type != KVME_TYPE_PHYS) | |
99 | continue; | |
100 | ||
101 | size = kve->kve_end - kve->kve_start; | |
102 | if (info_verbose) | |
103 | { | |
104 | fprintf_filtered (gdb_stdout, | |
105 | "Save segment, %ld bytes at %s (%c%c%c)\n", | |
106 | (long) size, | |
107 | paddress (target_gdbarch (), kve->kve_start), | |
108 | kve->kve_protection & KVME_PROT_READ ? 'r' : '-', | |
109 | kve->kve_protection & KVME_PROT_WRITE ? 'w' : '-', | |
110 | kve->kve_protection & KVME_PROT_EXEC ? 'x' : '-'); | |
111 | } | |
112 | ||
113 | /* Invoke the callback function to create the corefile segment. | |
114 | Pass MODIFIED as true, we do not know the real modification state. */ | |
115 | func (kve->kve_start, size, kve->kve_protection & KVME_PROT_READ, | |
116 | kve->kve_protection & KVME_PROT_WRITE, | |
117 | kve->kve_protection & KVME_PROT_EXEC, 1, data); | |
118 | } | |
119 | return 0; | |
120 | } | |
121 | ||
122 | /* Fetch the command line for a running process. */ | |
123 | ||
124 | static gdb::unique_xmalloc_ptr<char> | |
125 | fbsd_fetch_cmdline (pid_t pid) | |
126 | { | |
127 | size_t len; | |
128 | int mib[4]; | |
129 | ||
130 | len = 0; | |
131 | mib[0] = CTL_KERN; | |
132 | mib[1] = KERN_PROC; | |
133 | mib[2] = KERN_PROC_ARGS; | |
134 | mib[3] = pid; | |
135 | if (sysctl (mib, 4, NULL, &len, NULL, 0) == -1) | |
136 | return nullptr; | |
137 | ||
138 | if (len == 0) | |
139 | return nullptr; | |
140 | ||
141 | gdb::unique_xmalloc_ptr<char> cmdline ((char *) xmalloc (len)); | |
142 | if (sysctl (mib, 4, cmdline.get (), &len, NULL, 0) == -1) | |
143 | return nullptr; | |
144 | ||
145 | /* Join the arguments with spaces to form a single string. */ | |
146 | char *cp = cmdline.get (); | |
147 | for (size_t i = 0; i < len - 1; i++) | |
148 | if (cp[i] == '\0') | |
149 | cp[i] = ' '; | |
150 | cp[len - 1] = '\0'; | |
151 | ||
152 | return cmdline; | |
153 | } | |
154 | ||
155 | /* Fetch the external variant of the kernel's internal process | |
156 | structure for the process PID into KP. */ | |
157 | ||
158 | static bool | |
159 | fbsd_fetch_kinfo_proc (pid_t pid, struct kinfo_proc *kp) | |
160 | { | |
161 | size_t len; | |
162 | int mib[4]; | |
163 | ||
164 | len = sizeof *kp; | |
165 | mib[0] = CTL_KERN; | |
166 | mib[1] = KERN_PROC; | |
167 | mib[2] = KERN_PROC_PID; | |
168 | mib[3] = pid; | |
169 | return (sysctl (mib, 4, kp, &len, NULL, 0) == 0); | |
170 | } | |
171 | ||
172 | /* Implement the "info_proc" target_ops method. */ | |
173 | ||
174 | bool | |
175 | fbsd_nat_target::info_proc (const char *args, enum info_proc_what what) | |
176 | { | |
177 | gdb::unique_xmalloc_ptr<struct kinfo_file> fdtbl; | |
178 | int nfd = 0; | |
179 | struct kinfo_proc kp; | |
180 | pid_t pid; | |
181 | bool do_cmdline = false; | |
182 | bool do_cwd = false; | |
183 | bool do_exe = false; | |
184 | bool do_files = false; | |
185 | bool do_mappings = false; | |
186 | bool do_status = false; | |
187 | ||
188 | switch (what) | |
189 | { | |
190 | case IP_MINIMAL: | |
191 | do_cmdline = true; | |
192 | do_cwd = true; | |
193 | do_exe = true; | |
194 | break; | |
195 | case IP_MAPPINGS: | |
196 | do_mappings = true; | |
197 | break; | |
198 | case IP_STATUS: | |
199 | case IP_STAT: | |
200 | do_status = true; | |
201 | break; | |
202 | case IP_CMDLINE: | |
203 | do_cmdline = true; | |
204 | break; | |
205 | case IP_EXE: | |
206 | do_exe = true; | |
207 | break; | |
208 | case IP_CWD: | |
209 | do_cwd = true; | |
210 | break; | |
211 | case IP_FILES: | |
212 | do_files = true; | |
213 | break; | |
214 | case IP_ALL: | |
215 | do_cmdline = true; | |
216 | do_cwd = true; | |
217 | do_exe = true; | |
218 | do_files = true; | |
219 | do_mappings = true; | |
220 | do_status = true; | |
221 | break; | |
222 | default: | |
223 | error (_("Not supported on this target.")); | |
224 | } | |
225 | ||
226 | gdb_argv built_argv (args); | |
227 | if (built_argv.count () == 0) | |
228 | { | |
229 | pid = inferior_ptid.pid (); | |
230 | if (pid == 0) | |
231 | error (_("No current process: you must name one.")); | |
232 | } | |
233 | else if (built_argv.count () == 1 && isdigit (built_argv[0][0])) | |
234 | pid = strtol (built_argv[0], NULL, 10); | |
235 | else | |
236 | error (_("Invalid arguments.")); | |
237 | ||
238 | printf_filtered (_("process %d\n"), pid); | |
239 | if (do_cwd || do_exe || do_files) | |
240 | fdtbl.reset (kinfo_getfile (pid, &nfd)); | |
241 | ||
242 | if (do_cmdline) | |
243 | { | |
244 | gdb::unique_xmalloc_ptr<char> cmdline = fbsd_fetch_cmdline (pid); | |
245 | if (cmdline != nullptr) | |
246 | printf_filtered ("cmdline = '%s'\n", cmdline.get ()); | |
247 | else | |
248 | warning (_("unable to fetch command line")); | |
249 | } | |
250 | if (do_cwd) | |
251 | { | |
252 | const char *cwd = NULL; | |
253 | struct kinfo_file *kf = fdtbl.get (); | |
254 | for (int i = 0; i < nfd; i++, kf++) | |
255 | { | |
256 | if (kf->kf_type == KF_TYPE_VNODE && kf->kf_fd == KF_FD_TYPE_CWD) | |
257 | { | |
258 | cwd = kf->kf_path; | |
259 | break; | |
260 | } | |
261 | } | |
262 | if (cwd != NULL) | |
263 | printf_filtered ("cwd = '%s'\n", cwd); | |
264 | else | |
265 | warning (_("unable to fetch current working directory")); | |
266 | } | |
267 | if (do_exe) | |
268 | { | |
269 | const char *exe = NULL; | |
270 | struct kinfo_file *kf = fdtbl.get (); | |
271 | for (int i = 0; i < nfd; i++, kf++) | |
272 | { | |
273 | if (kf->kf_type == KF_TYPE_VNODE && kf->kf_fd == KF_FD_TYPE_TEXT) | |
274 | { | |
275 | exe = kf->kf_path; | |
276 | break; | |
277 | } | |
278 | } | |
279 | if (exe == NULL) | |
280 | exe = pid_to_exec_file (pid); | |
281 | if (exe != NULL) | |
282 | printf_filtered ("exe = '%s'\n", exe); | |
283 | else | |
284 | warning (_("unable to fetch executable path name")); | |
285 | } | |
286 | if (do_files) | |
287 | { | |
288 | struct kinfo_file *kf = fdtbl.get (); | |
289 | ||
290 | if (nfd > 0) | |
291 | { | |
292 | fbsd_info_proc_files_header (); | |
293 | for (int i = 0; i < nfd; i++, kf++) | |
294 | fbsd_info_proc_files_entry (kf->kf_type, kf->kf_fd, kf->kf_flags, | |
295 | kf->kf_offset, kf->kf_vnode_type, | |
296 | kf->kf_sock_domain, kf->kf_sock_type, | |
297 | kf->kf_sock_protocol, &kf->kf_sa_local, | |
298 | &kf->kf_sa_peer, kf->kf_path); | |
299 | } | |
300 | else | |
301 | warning (_("unable to fetch list of open files")); | |
302 | } | |
303 | if (do_mappings) | |
304 | { | |
305 | int nvment; | |
306 | gdb::unique_xmalloc_ptr<struct kinfo_vmentry> | |
307 | vmentl (kinfo_getvmmap (pid, &nvment)); | |
308 | ||
309 | if (vmentl != nullptr) | |
310 | { | |
311 | int addr_bit = TARGET_CHAR_BIT * sizeof (void *); | |
312 | fbsd_info_proc_mappings_header (addr_bit); | |
313 | ||
314 | struct kinfo_vmentry *kve = vmentl.get (); | |
315 | for (int i = 0; i < nvment; i++, kve++) | |
316 | fbsd_info_proc_mappings_entry (addr_bit, kve->kve_start, | |
317 | kve->kve_end, kve->kve_offset, | |
318 | kve->kve_flags, kve->kve_protection, | |
319 | kve->kve_path); | |
320 | } | |
321 | else | |
322 | warning (_("unable to fetch virtual memory map")); | |
323 | } | |
324 | if (do_status) | |
325 | { | |
326 | if (!fbsd_fetch_kinfo_proc (pid, &kp)) | |
327 | warning (_("Failed to fetch process information")); | |
328 | else | |
329 | { | |
330 | const char *state; | |
331 | int pgtok; | |
332 | ||
333 | printf_filtered ("Name: %s\n", kp.ki_comm); | |
334 | switch (kp.ki_stat) | |
335 | { | |
336 | case SIDL: | |
337 | state = "I (idle)"; | |
338 | break; | |
339 | case SRUN: | |
340 | state = "R (running)"; | |
341 | break; | |
342 | case SSTOP: | |
343 | state = "T (stopped)"; | |
344 | break; | |
345 | case SZOMB: | |
346 | state = "Z (zombie)"; | |
347 | break; | |
348 | case SSLEEP: | |
349 | state = "S (sleeping)"; | |
350 | break; | |
351 | case SWAIT: | |
352 | state = "W (interrupt wait)"; | |
353 | break; | |
354 | case SLOCK: | |
355 | state = "L (blocked on lock)"; | |
356 | break; | |
357 | default: | |
358 | state = "? (unknown)"; | |
359 | break; | |
360 | } | |
361 | printf_filtered ("State: %s\n", state); | |
362 | printf_filtered ("Parent process: %d\n", kp.ki_ppid); | |
363 | printf_filtered ("Process group: %d\n", kp.ki_pgid); | |
364 | printf_filtered ("Session id: %d\n", kp.ki_sid); | |
365 | printf_filtered ("TTY: %ju\n", (uintmax_t) kp.ki_tdev); | |
366 | printf_filtered ("TTY owner process group: %d\n", kp.ki_tpgid); | |
367 | printf_filtered ("User IDs (real, effective, saved): %d %d %d\n", | |
368 | kp.ki_ruid, kp.ki_uid, kp.ki_svuid); | |
369 | printf_filtered ("Group IDs (real, effective, saved): %d %d %d\n", | |
370 | kp.ki_rgid, kp.ki_groups[0], kp.ki_svgid); | |
371 | printf_filtered ("Groups: "); | |
372 | for (int i = 0; i < kp.ki_ngroups; i++) | |
373 | printf_filtered ("%d ", kp.ki_groups[i]); | |
374 | printf_filtered ("\n"); | |
375 | printf_filtered ("Minor faults (no memory page): %ld\n", | |
376 | kp.ki_rusage.ru_minflt); | |
377 | printf_filtered ("Minor faults, children: %ld\n", | |
378 | kp.ki_rusage_ch.ru_minflt); | |
379 | printf_filtered ("Major faults (memory page faults): %ld\n", | |
380 | kp.ki_rusage.ru_majflt); | |
381 | printf_filtered ("Major faults, children: %ld\n", | |
382 | kp.ki_rusage_ch.ru_majflt); | |
383 | printf_filtered ("utime: %jd.%06ld\n", | |
384 | (intmax_t) kp.ki_rusage.ru_utime.tv_sec, | |
385 | kp.ki_rusage.ru_utime.tv_usec); | |
386 | printf_filtered ("stime: %jd.%06ld\n", | |
387 | (intmax_t) kp.ki_rusage.ru_stime.tv_sec, | |
388 | kp.ki_rusage.ru_stime.tv_usec); | |
389 | printf_filtered ("utime, children: %jd.%06ld\n", | |
390 | (intmax_t) kp.ki_rusage_ch.ru_utime.tv_sec, | |
391 | kp.ki_rusage_ch.ru_utime.tv_usec); | |
392 | printf_filtered ("stime, children: %jd.%06ld\n", | |
393 | (intmax_t) kp.ki_rusage_ch.ru_stime.tv_sec, | |
394 | kp.ki_rusage_ch.ru_stime.tv_usec); | |
395 | printf_filtered ("'nice' value: %d\n", kp.ki_nice); | |
396 | printf_filtered ("Start time: %jd.%06ld\n", kp.ki_start.tv_sec, | |
397 | kp.ki_start.tv_usec); | |
398 | pgtok = getpagesize () / 1024; | |
399 | printf_filtered ("Virtual memory size: %ju kB\n", | |
400 | (uintmax_t) kp.ki_size / 1024); | |
401 | printf_filtered ("Data size: %ju kB\n", | |
402 | (uintmax_t) kp.ki_dsize * pgtok); | |
403 | printf_filtered ("Stack size: %ju kB\n", | |
404 | (uintmax_t) kp.ki_ssize * pgtok); | |
405 | printf_filtered ("Text size: %ju kB\n", | |
406 | (uintmax_t) kp.ki_tsize * pgtok); | |
407 | printf_filtered ("Resident set size: %ju kB\n", | |
408 | (uintmax_t) kp.ki_rssize * pgtok); | |
409 | printf_filtered ("Maximum RSS: %ju kB\n", | |
410 | (uintmax_t) kp.ki_rusage.ru_maxrss); | |
411 | printf_filtered ("Pending Signals: "); | |
412 | for (int i = 0; i < _SIG_WORDS; i++) | |
413 | printf_filtered ("%08x ", kp.ki_siglist.__bits[i]); | |
414 | printf_filtered ("\n"); | |
415 | printf_filtered ("Ignored Signals: "); | |
416 | for (int i = 0; i < _SIG_WORDS; i++) | |
417 | printf_filtered ("%08x ", kp.ki_sigignore.__bits[i]); | |
418 | printf_filtered ("\n"); | |
419 | printf_filtered ("Caught Signals: "); | |
420 | for (int i = 0; i < _SIG_WORDS; i++) | |
421 | printf_filtered ("%08x ", kp.ki_sigcatch.__bits[i]); | |
422 | printf_filtered ("\n"); | |
423 | } | |
424 | } | |
425 | ||
426 | return true; | |
427 | } | |
428 | ||
429 | /* Return the size of siginfo for the current inferior. */ | |
430 | ||
431 | #ifdef __LP64__ | |
432 | union sigval32 { | |
433 | int sival_int; | |
434 | uint32_t sival_ptr; | |
435 | }; | |
436 | ||
437 | /* This structure matches the naming and layout of `siginfo_t' in | |
438 | <sys/signal.h>. In particular, the `si_foo' macros defined in that | |
439 | header can be used with both types to copy fields in the `_reason' | |
440 | union. */ | |
441 | ||
442 | struct siginfo32 | |
443 | { | |
444 | int si_signo; | |
445 | int si_errno; | |
446 | int si_code; | |
447 | __pid_t si_pid; | |
448 | __uid_t si_uid; | |
449 | int si_status; | |
450 | uint32_t si_addr; | |
451 | union sigval32 si_value; | |
452 | union | |
453 | { | |
454 | struct | |
455 | { | |
456 | int _trapno; | |
457 | } _fault; | |
458 | struct | |
459 | { | |
460 | int _timerid; | |
461 | int _overrun; | |
462 | } _timer; | |
463 | struct | |
464 | { | |
465 | int _mqd; | |
466 | } _mesgq; | |
467 | struct | |
468 | { | |
469 | int32_t _band; | |
470 | } _poll; | |
471 | struct | |
472 | { | |
473 | int32_t __spare1__; | |
474 | int __spare2__[7]; | |
475 | } __spare__; | |
476 | } _reason; | |
477 | }; | |
478 | #endif | |
479 | ||
480 | static size_t | |
481 | fbsd_siginfo_size () | |
482 | { | |
483 | #ifdef __LP64__ | |
484 | struct gdbarch *gdbarch = get_frame_arch (get_current_frame ()); | |
485 | ||
486 | /* Is the inferior 32-bit? If so, use the 32-bit siginfo size. */ | |
487 | if (gdbarch_long_bit (gdbarch) == 32) | |
488 | return sizeof (struct siginfo32); | |
489 | #endif | |
490 | return sizeof (siginfo_t); | |
491 | } | |
492 | ||
493 | /* Convert a native 64-bit siginfo object to a 32-bit object. Note | |
494 | that FreeBSD doesn't support writing to $_siginfo, so this only | |
495 | needs to convert one way. */ | |
496 | ||
497 | static void | |
498 | fbsd_convert_siginfo (siginfo_t *si) | |
499 | { | |
500 | #ifdef __LP64__ | |
501 | struct gdbarch *gdbarch = get_frame_arch (get_current_frame ()); | |
502 | ||
503 | /* Is the inferior 32-bit? If not, nothing to do. */ | |
504 | if (gdbarch_long_bit (gdbarch) != 32) | |
505 | return; | |
506 | ||
507 | struct siginfo32 si32; | |
508 | ||
509 | si32.si_signo = si->si_signo; | |
510 | si32.si_errno = si->si_errno; | |
511 | si32.si_code = si->si_code; | |
512 | si32.si_pid = si->si_pid; | |
513 | si32.si_uid = si->si_uid; | |
514 | si32.si_status = si->si_status; | |
515 | si32.si_addr = (uintptr_t) si->si_addr; | |
516 | ||
517 | /* If sival_ptr is being used instead of sival_int on a big-endian | |
518 | platform, then sival_int will be zero since it holds the upper | |
519 | 32-bits of the pointer value. */ | |
520 | #if _BYTE_ORDER == _BIG_ENDIAN | |
521 | if (si->si_value.sival_int == 0) | |
522 | si32.si_value.sival_ptr = (uintptr_t) si->si_value.sival_ptr; | |
523 | else | |
524 | si32.si_value.sival_int = si->si_value.sival_int; | |
525 | #else | |
526 | si32.si_value.sival_int = si->si_value.sival_int; | |
527 | #endif | |
528 | ||
529 | /* Always copy the spare fields and then possibly overwrite them for | |
530 | signal-specific or code-specific fields. */ | |
531 | si32._reason.__spare__.__spare1__ = si->_reason.__spare__.__spare1__; | |
532 | for (int i = 0; i < 7; i++) | |
533 | si32._reason.__spare__.__spare2__[i] = si->_reason.__spare__.__spare2__[i]; | |
534 | switch (si->si_signo) { | |
535 | case SIGILL: | |
536 | case SIGFPE: | |
537 | case SIGSEGV: | |
538 | case SIGBUS: | |
539 | si32.si_trapno = si->si_trapno; | |
540 | break; | |
541 | } | |
542 | switch (si->si_code) { | |
543 | case SI_TIMER: | |
544 | si32.si_timerid = si->si_timerid; | |
545 | si32.si_overrun = si->si_overrun; | |
546 | break; | |
547 | case SI_MESGQ: | |
548 | si32.si_mqd = si->si_mqd; | |
549 | break; | |
550 | } | |
551 | ||
552 | memcpy(si, &si32, sizeof (si32)); | |
553 | #endif | |
554 | } | |
555 | ||
556 | /* Implement the "xfer_partial" target_ops method. */ | |
557 | ||
558 | enum target_xfer_status | |
559 | fbsd_nat_target::xfer_partial (enum target_object object, | |
560 | const char *annex, gdb_byte *readbuf, | |
561 | const gdb_byte *writebuf, | |
562 | ULONGEST offset, ULONGEST len, | |
563 | ULONGEST *xfered_len) | |
564 | { | |
565 | pid_t pid = inferior_ptid.pid (); | |
566 | ||
567 | switch (object) | |
568 | { | |
569 | case TARGET_OBJECT_SIGNAL_INFO: | |
570 | { | |
571 | struct ptrace_lwpinfo pl; | |
572 | size_t siginfo_size; | |
573 | ||
574 | /* FreeBSD doesn't support writing to $_siginfo. */ | |
575 | if (writebuf != NULL) | |
576 | return TARGET_XFER_E_IO; | |
577 | ||
578 | if (inferior_ptid.lwp_p ()) | |
579 | pid = inferior_ptid.lwp (); | |
580 | ||
581 | siginfo_size = fbsd_siginfo_size (); | |
582 | if (offset > siginfo_size) | |
583 | return TARGET_XFER_E_IO; | |
584 | ||
585 | if (ptrace (PT_LWPINFO, pid, (PTRACE_TYPE_ARG3) &pl, sizeof (pl)) == -1) | |
586 | return TARGET_XFER_E_IO; | |
587 | ||
588 | if (!(pl.pl_flags & PL_FLAG_SI)) | |
589 | return TARGET_XFER_E_IO; | |
590 | ||
591 | fbsd_convert_siginfo (&pl.pl_siginfo); | |
592 | if (offset + len > siginfo_size) | |
593 | len = siginfo_size - offset; | |
594 | ||
595 | memcpy (readbuf, ((gdb_byte *) &pl.pl_siginfo) + offset, len); | |
596 | *xfered_len = len; | |
597 | return TARGET_XFER_OK; | |
598 | } | |
599 | #ifdef KERN_PROC_AUXV | |
600 | case TARGET_OBJECT_AUXV: | |
601 | { | |
602 | gdb::byte_vector buf_storage; | |
603 | gdb_byte *buf; | |
604 | size_t buflen; | |
605 | int mib[4]; | |
606 | ||
607 | if (writebuf != NULL) | |
608 | return TARGET_XFER_E_IO; | |
609 | mib[0] = CTL_KERN; | |
610 | mib[1] = KERN_PROC; | |
611 | mib[2] = KERN_PROC_AUXV; | |
612 | mib[3] = pid; | |
613 | if (offset == 0) | |
614 | { | |
615 | buf = readbuf; | |
616 | buflen = len; | |
617 | } | |
618 | else | |
619 | { | |
620 | buflen = offset + len; | |
621 | buf_storage.resize (buflen); | |
622 | buf = buf_storage.data (); | |
623 | } | |
624 | if (sysctl (mib, 4, buf, &buflen, NULL, 0) == 0) | |
625 | { | |
626 | if (offset != 0) | |
627 | { | |
628 | if (buflen > offset) | |
629 | { | |
630 | buflen -= offset; | |
631 | memcpy (readbuf, buf + offset, buflen); | |
632 | } | |
633 | else | |
634 | buflen = 0; | |
635 | } | |
636 | *xfered_len = buflen; | |
637 | return (buflen == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; | |
638 | } | |
639 | return TARGET_XFER_E_IO; | |
640 | } | |
641 | #endif | |
642 | #if defined(KERN_PROC_VMMAP) && defined(KERN_PROC_PS_STRINGS) | |
643 | case TARGET_OBJECT_FREEBSD_VMMAP: | |
644 | case TARGET_OBJECT_FREEBSD_PS_STRINGS: | |
645 | { | |
646 | gdb::byte_vector buf_storage; | |
647 | gdb_byte *buf; | |
648 | size_t buflen; | |
649 | int mib[4]; | |
650 | ||
651 | int proc_target; | |
652 | uint32_t struct_size; | |
653 | switch (object) | |
654 | { | |
655 | case TARGET_OBJECT_FREEBSD_VMMAP: | |
656 | proc_target = KERN_PROC_VMMAP; | |
657 | struct_size = sizeof (struct kinfo_vmentry); | |
658 | break; | |
659 | case TARGET_OBJECT_FREEBSD_PS_STRINGS: | |
660 | proc_target = KERN_PROC_PS_STRINGS; | |
661 | struct_size = sizeof (void *); | |
662 | break; | |
663 | } | |
664 | ||
665 | if (writebuf != NULL) | |
666 | return TARGET_XFER_E_IO; | |
667 | ||
668 | mib[0] = CTL_KERN; | |
669 | mib[1] = KERN_PROC; | |
670 | mib[2] = proc_target; | |
671 | mib[3] = pid; | |
672 | ||
673 | if (sysctl (mib, 4, NULL, &buflen, NULL, 0) != 0) | |
674 | return TARGET_XFER_E_IO; | |
675 | buflen += sizeof (struct_size); | |
676 | ||
677 | if (offset >= buflen) | |
678 | { | |
679 | *xfered_len = 0; | |
680 | return TARGET_XFER_EOF; | |
681 | } | |
682 | ||
683 | buf_storage.resize (buflen); | |
684 | buf = buf_storage.data (); | |
685 | ||
686 | memcpy (buf, &struct_size, sizeof (struct_size)); | |
687 | buflen -= sizeof (struct_size); | |
688 | if (sysctl (mib, 4, buf + sizeof (struct_size), &buflen, NULL, 0) != 0) | |
689 | return TARGET_XFER_E_IO; | |
690 | buflen += sizeof (struct_size); | |
691 | ||
692 | if (buflen - offset < len) | |
693 | len = buflen - offset; | |
694 | memcpy (readbuf, buf + offset, len); | |
695 | *xfered_len = len; | |
696 | return TARGET_XFER_OK; | |
697 | } | |
698 | #endif | |
699 | default: | |
700 | return inf_ptrace_target::xfer_partial (object, annex, | |
701 | readbuf, writebuf, offset, | |
702 | len, xfered_len); | |
703 | } | |
704 | } | |
705 | ||
706 | static bool debug_fbsd_lwp; | |
707 | static bool debug_fbsd_nat; | |
708 | ||
709 | static void | |
710 | show_fbsd_lwp_debug (struct ui_file *file, int from_tty, | |
711 | struct cmd_list_element *c, const char *value) | |
712 | { | |
713 | fprintf_filtered (file, _("Debugging of FreeBSD lwp module is %s.\n"), value); | |
714 | } | |
715 | ||
716 | static void | |
717 | show_fbsd_nat_debug (struct ui_file *file, int from_tty, | |
718 | struct cmd_list_element *c, const char *value) | |
719 | { | |
720 | fprintf_filtered (file, _("Debugging of FreeBSD native target is %s.\n"), | |
721 | value); | |
722 | } | |
723 | ||
724 | /* | |
725 | FreeBSD's first thread support was via a "reentrant" version of libc | |
726 | (libc_r) that first shipped in 2.2.7. This library multiplexed all | |
727 | of the threads in a process onto a single kernel thread. This | |
728 | library was supported via the bsd-uthread target. | |
729 | ||
730 | FreeBSD 5.1 introduced two new threading libraries that made use of | |
731 | multiple kernel threads. The first (libkse) scheduled M user | |
732 | threads onto N (<= M) kernel threads (LWPs). The second (libthr) | |
733 | bound each user thread to a dedicated kernel thread. libkse shipped | |
734 | as the default threading library (libpthread). | |
735 | ||
736 | FreeBSD 5.3 added a libthread_db to abstract the interface across | |
737 | the various thread libraries (libc_r, libkse, and libthr). | |
738 | ||
739 | FreeBSD 7.0 switched the default threading library from from libkse | |
740 | to libpthread and removed libc_r. | |
741 | ||
742 | FreeBSD 8.0 removed libkse and the in-kernel support for it. The | |
743 | only threading library supported by 8.0 and later is libthr which | |
744 | ties each user thread directly to an LWP. To simplify the | |
745 | implementation, this target only supports LWP-backed threads using | |
746 | ptrace directly rather than libthread_db. | |
747 | ||
748 | FreeBSD 11.0 introduced LWP event reporting via PT_LWP_EVENTS. | |
749 | */ | |
750 | ||
751 | /* Return true if PTID is still active in the inferior. */ | |
752 | ||
753 | bool | |
754 | fbsd_nat_target::thread_alive (ptid_t ptid) | |
755 | { | |
756 | if (ptid.lwp_p ()) | |
757 | { | |
758 | struct ptrace_lwpinfo pl; | |
759 | ||
760 | if (ptrace (PT_LWPINFO, ptid.lwp (), (caddr_t) &pl, sizeof pl) | |
761 | == -1) | |
762 | return false; | |
763 | #ifdef PL_FLAG_EXITED | |
764 | if (pl.pl_flags & PL_FLAG_EXITED) | |
765 | return false; | |
766 | #endif | |
767 | } | |
768 | ||
769 | return true; | |
770 | } | |
771 | ||
772 | /* Convert PTID to a string. */ | |
773 | ||
774 | std::string | |
775 | fbsd_nat_target::pid_to_str (ptid_t ptid) | |
776 | { | |
777 | lwpid_t lwp; | |
778 | ||
779 | lwp = ptid.lwp (); | |
780 | if (lwp != 0) | |
781 | { | |
782 | int pid = ptid.pid (); | |
783 | ||
784 | return string_printf ("LWP %d of process %d", lwp, pid); | |
785 | } | |
786 | ||
787 | return normal_pid_to_str (ptid); | |
788 | } | |
789 | ||
790 | #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME | |
791 | /* Return the name assigned to a thread by an application. Returns | |
792 | the string in a static buffer. */ | |
793 | ||
794 | const char * | |
795 | fbsd_nat_target::thread_name (struct thread_info *thr) | |
796 | { | |
797 | struct ptrace_lwpinfo pl; | |
798 | struct kinfo_proc kp; | |
799 | int pid = thr->ptid.pid (); | |
800 | long lwp = thr->ptid.lwp (); | |
801 | static char buf[sizeof pl.pl_tdname + 1]; | |
802 | ||
803 | /* Note that ptrace_lwpinfo returns the process command in pl_tdname | |
804 | if a name has not been set explicitly. Return a NULL name in | |
805 | that case. */ | |
806 | if (!fbsd_fetch_kinfo_proc (pid, &kp)) | |
807 | perror_with_name (_("Failed to fetch process information")); | |
808 | if (ptrace (PT_LWPINFO, lwp, (caddr_t) &pl, sizeof pl) == -1) | |
809 | perror_with_name (("ptrace")); | |
810 | if (strcmp (kp.ki_comm, pl.pl_tdname) == 0) | |
811 | return NULL; | |
812 | xsnprintf (buf, sizeof buf, "%s", pl.pl_tdname); | |
813 | return buf; | |
814 | } | |
815 | #endif | |
816 | ||
817 | /* Enable additional event reporting on new processes. | |
818 | ||
819 | To catch fork events, PTRACE_FORK is set on every traced process | |
820 | to enable stops on returns from fork or vfork. Note that both the | |
821 | parent and child will always stop, even if system call stops are | |
822 | not enabled. | |
823 | ||
824 | To catch LWP events, PTRACE_EVENTS is set on every traced process. | |
825 | This enables stops on the birth for new LWPs (excluding the "main" LWP) | |
826 | and the death of LWPs (excluding the last LWP in a process). Note | |
827 | that unlike fork events, the LWP that creates a new LWP does not | |
828 | report an event. */ | |
829 | ||
830 | static void | |
831 | fbsd_enable_proc_events (pid_t pid) | |
832 | { | |
833 | #ifdef PT_GET_EVENT_MASK | |
834 | int events; | |
835 | ||
836 | if (ptrace (PT_GET_EVENT_MASK, pid, (PTRACE_TYPE_ARG3)&events, | |
837 | sizeof (events)) == -1) | |
838 | perror_with_name (("ptrace")); | |
839 | events |= PTRACE_FORK | PTRACE_LWP; | |
840 | #ifdef PTRACE_VFORK | |
841 | events |= PTRACE_VFORK; | |
842 | #endif | |
843 | if (ptrace (PT_SET_EVENT_MASK, pid, (PTRACE_TYPE_ARG3)&events, | |
844 | sizeof (events)) == -1) | |
845 | perror_with_name (("ptrace")); | |
846 | #else | |
847 | #ifdef TDP_RFPPWAIT | |
848 | if (ptrace (PT_FOLLOW_FORK, pid, (PTRACE_TYPE_ARG3)0, 1) == -1) | |
849 | perror_with_name (("ptrace")); | |
850 | #endif | |
851 | #ifdef PT_LWP_EVENTS | |
852 | if (ptrace (PT_LWP_EVENTS, pid, (PTRACE_TYPE_ARG3)0, 1) == -1) | |
853 | perror_with_name (("ptrace")); | |
854 | #endif | |
855 | #endif | |
856 | } | |
857 | ||
858 | /* Add threads for any new LWPs in a process. | |
859 | ||
860 | When LWP events are used, this function is only used to detect existing | |
861 | threads when attaching to a process. On older systems, this function is | |
862 | called to discover new threads each time the thread list is updated. */ | |
863 | ||
864 | static void | |
865 | fbsd_add_threads (fbsd_nat_target *target, pid_t pid) | |
866 | { | |
867 | int i, nlwps; | |
868 | ||
869 | gdb_assert (!in_thread_list (target, ptid_t (pid))); | |
870 | nlwps = ptrace (PT_GETNUMLWPS, pid, NULL, 0); | |
871 | if (nlwps == -1) | |
872 | perror_with_name (("ptrace")); | |
873 | ||
874 | gdb::unique_xmalloc_ptr<lwpid_t[]> lwps (XCNEWVEC (lwpid_t, nlwps)); | |
875 | ||
876 | nlwps = ptrace (PT_GETLWPLIST, pid, (caddr_t) lwps.get (), nlwps); | |
877 | if (nlwps == -1) | |
878 | perror_with_name (("ptrace")); | |
879 | ||
880 | for (i = 0; i < nlwps; i++) | |
881 | { | |
882 | ptid_t ptid = ptid_t (pid, lwps[i], 0); | |
883 | ||
884 | if (!in_thread_list (target, ptid)) | |
885 | { | |
886 | #ifdef PT_LWP_EVENTS | |
887 | struct ptrace_lwpinfo pl; | |
888 | ||
889 | /* Don't add exited threads. Note that this is only called | |
890 | when attaching to a multi-threaded process. */ | |
891 | if (ptrace (PT_LWPINFO, lwps[i], (caddr_t) &pl, sizeof pl) == -1) | |
892 | perror_with_name (("ptrace")); | |
893 | if (pl.pl_flags & PL_FLAG_EXITED) | |
894 | continue; | |
895 | #endif | |
896 | if (debug_fbsd_lwp) | |
897 | fprintf_unfiltered (gdb_stdlog, | |
898 | "FLWP: adding thread for LWP %u\n", | |
899 | lwps[i]); | |
900 | add_thread (target, ptid); | |
901 | } | |
902 | } | |
903 | } | |
904 | ||
905 | /* Implement the "update_thread_list" target_ops method. */ | |
906 | ||
907 | void | |
908 | fbsd_nat_target::update_thread_list () | |
909 | { | |
910 | #ifdef PT_LWP_EVENTS | |
911 | /* With support for thread events, threads are added/deleted from the | |
912 | list as events are reported, so just try deleting exited threads. */ | |
913 | delete_exited_threads (); | |
914 | #else | |
915 | prune_threads (); | |
916 | ||
917 | fbsd_add_threads (this, inferior_ptid.pid ()); | |
918 | #endif | |
919 | } | |
920 | ||
921 | #ifdef TDP_RFPPWAIT | |
922 | /* | |
923 | To catch fork events, PT_FOLLOW_FORK is set on every traced process | |
924 | to enable stops on returns from fork or vfork. Note that both the | |
925 | parent and child will always stop, even if system call stops are not | |
926 | enabled. | |
927 | ||
928 | After a fork, both the child and parent process will stop and report | |
929 | an event. However, there is no guarantee of order. If the parent | |
930 | reports its stop first, then fbsd_wait explicitly waits for the new | |
931 | child before returning. If the child reports its stop first, then | |
932 | the event is saved on a list and ignored until the parent's stop is | |
933 | reported. fbsd_wait could have been changed to fetch the parent PID | |
934 | of the new child and used that to wait for the parent explicitly. | |
935 | However, if two threads in the parent fork at the same time, then | |
936 | the wait on the parent might return the "wrong" fork event. | |
937 | ||
938 | The initial version of PT_FOLLOW_FORK did not set PL_FLAG_CHILD for | |
939 | the new child process. This flag could be inferred by treating any | |
940 | events for an unknown pid as a new child. | |
941 | ||
942 | In addition, the initial version of PT_FOLLOW_FORK did not report a | |
943 | stop event for the parent process of a vfork until after the child | |
944 | process executed a new program or exited. The kernel was changed to | |
945 | defer the wait for exit or exec of the child until after posting the | |
946 | stop event shortly after the change to introduce PL_FLAG_CHILD. | |
947 | This could be worked around by reporting a vfork event when the | |
948 | child event posted and ignoring the subsequent event from the | |
949 | parent. | |
950 | ||
951 | This implementation requires both of these fixes for simplicity's | |
952 | sake. FreeBSD versions newer than 9.1 contain both fixes. | |
953 | */ | |
954 | ||
955 | static std::list<ptid_t> fbsd_pending_children; | |
956 | ||
957 | /* Record a new child process event that is reported before the | |
958 | corresponding fork event in the parent. */ | |
959 | ||
960 | static void | |
961 | fbsd_remember_child (ptid_t pid) | |
962 | { | |
963 | fbsd_pending_children.push_front (pid); | |
964 | } | |
965 | ||
966 | /* Check for a previously-recorded new child process event for PID. | |
967 | If one is found, remove it from the list and return the PTID. */ | |
968 | ||
969 | static ptid_t | |
970 | fbsd_is_child_pending (pid_t pid) | |
971 | { | |
972 | for (auto it = fbsd_pending_children.begin (); | |
973 | it != fbsd_pending_children.end (); it++) | |
974 | if (it->pid () == pid) | |
975 | { | |
976 | ptid_t ptid = *it; | |
977 | fbsd_pending_children.erase (it); | |
978 | return ptid; | |
979 | } | |
980 | return null_ptid; | |
981 | } | |
982 | ||
983 | #ifndef PTRACE_VFORK | |
984 | static std::forward_list<ptid_t> fbsd_pending_vfork_done; | |
985 | ||
986 | /* Record a pending vfork done event. */ | |
987 | ||
988 | static void | |
989 | fbsd_add_vfork_done (ptid_t pid) | |
990 | { | |
991 | fbsd_pending_vfork_done.push_front (pid); | |
992 | } | |
993 | ||
994 | /* Check for a pending vfork done event for a specific PID. */ | |
995 | ||
996 | static int | |
997 | fbsd_is_vfork_done_pending (pid_t pid) | |
998 | { | |
999 | for (auto it = fbsd_pending_vfork_done.begin (); | |
1000 | it != fbsd_pending_vfork_done.end (); it++) | |
1001 | if (it->pid () == pid) | |
1002 | return 1; | |
1003 | return 0; | |
1004 | } | |
1005 | ||
1006 | /* Check for a pending vfork done event. If one is found, remove it | |
1007 | from the list and return the PTID. */ | |
1008 | ||
1009 | static ptid_t | |
1010 | fbsd_next_vfork_done (void) | |
1011 | { | |
1012 | if (!fbsd_pending_vfork_done.empty ()) | |
1013 | { | |
1014 | ptid_t ptid = fbsd_pending_vfork_done.front (); | |
1015 | fbsd_pending_vfork_done.pop_front (); | |
1016 | return ptid; | |
1017 | } | |
1018 | return null_ptid; | |
1019 | } | |
1020 | #endif | |
1021 | #endif | |
1022 | ||
1023 | /* Implement the "resume" target_ops method. */ | |
1024 | ||
1025 | void | |
1026 | fbsd_nat_target::resume (ptid_t ptid, int step, enum gdb_signal signo) | |
1027 | { | |
1028 | #if defined(TDP_RFPPWAIT) && !defined(PTRACE_VFORK) | |
1029 | pid_t pid; | |
1030 | ||
1031 | /* Don't PT_CONTINUE a process which has a pending vfork done event. */ | |
1032 | if (minus_one_ptid == ptid) | |
1033 | pid = inferior_ptid.pid (); | |
1034 | else | |
1035 | pid = ptid.pid (); | |
1036 | if (fbsd_is_vfork_done_pending (pid)) | |
1037 | return; | |
1038 | #endif | |
1039 | ||
1040 | if (debug_fbsd_lwp) | |
1041 | fprintf_unfiltered (gdb_stdlog, | |
1042 | "FLWP: fbsd_resume for ptid (%d, %ld, %ld)\n", | |
1043 | ptid.pid (), ptid.lwp (), | |
1044 | ptid.tid ()); | |
1045 | if (ptid.lwp_p ()) | |
1046 | { | |
1047 | /* If ptid is a specific LWP, suspend all other LWPs in the process. */ | |
1048 | inferior *inf = find_inferior_ptid (this, ptid); | |
1049 | ||
1050 | for (thread_info *tp : inf->non_exited_threads ()) | |
1051 | { | |
1052 | int request; | |
1053 | ||
1054 | if (tp->ptid.lwp () == ptid.lwp ()) | |
1055 | request = PT_RESUME; | |
1056 | else | |
1057 | request = PT_SUSPEND; | |
1058 | ||
1059 | if (ptrace (request, tp->ptid.lwp (), NULL, 0) == -1) | |
1060 | perror_with_name (("ptrace")); | |
1061 | } | |
1062 | } | |
1063 | else | |
1064 | { | |
1065 | /* If ptid is a wildcard, resume all matching threads (they won't run | |
1066 | until the process is continued however). */ | |
1067 | for (thread_info *tp : all_non_exited_threads (this, ptid)) | |
1068 | if (ptrace (PT_RESUME, tp->ptid.lwp (), NULL, 0) == -1) | |
1069 | perror_with_name (("ptrace")); | |
1070 | ptid = inferior_ptid; | |
1071 | } | |
1072 | ||
1073 | #if __FreeBSD_version < 1200052 | |
1074 | /* When multiple threads within a process wish to report STOPPED | |
1075 | events from wait(), the kernel picks one thread event as the | |
1076 | thread event to report. The chosen thread event is retrieved via | |
1077 | PT_LWPINFO by passing the process ID as the request pid. If | |
1078 | multiple events are pending, then the subsequent wait() after | |
1079 | resuming a process will report another STOPPED event after | |
1080 | resuming the process to handle the next thread event and so on. | |
1081 | ||
1082 | A single thread event is cleared as a side effect of resuming the | |
1083 | process with PT_CONTINUE, PT_STEP, etc. In older kernels, | |
1084 | however, the request pid was used to select which thread's event | |
1085 | was cleared rather than always clearing the event that was just | |
1086 | reported. To avoid clearing the event of the wrong LWP, always | |
1087 | pass the process ID instead of an LWP ID to PT_CONTINUE or | |
1088 | PT_SYSCALL. | |
1089 | ||
1090 | In the case of stepping, the process ID cannot be used with | |
1091 | PT_STEP since it would step the thread that reported an event | |
1092 | which may not be the thread indicated by PTID. For stepping, use | |
1093 | PT_SETSTEP to enable stepping on the desired thread before | |
1094 | resuming the process via PT_CONTINUE instead of using | |
1095 | PT_STEP. */ | |
1096 | if (step) | |
1097 | { | |
1098 | if (ptrace (PT_SETSTEP, get_ptrace_pid (ptid), NULL, 0) == -1) | |
1099 | perror_with_name (("ptrace")); | |
1100 | step = 0; | |
1101 | } | |
1102 | ptid = ptid_t (ptid.pid ()); | |
1103 | #endif | |
1104 | inf_ptrace_target::resume (ptid, step, signo); | |
1105 | } | |
1106 | ||
1107 | #ifdef USE_SIGTRAP_SIGINFO | |
1108 | /* Handle breakpoint and trace traps reported via SIGTRAP. If the | |
1109 | trap was a breakpoint or trace trap that should be reported to the | |
1110 | core, return true. */ | |
1111 | ||
1112 | static bool | |
1113 | fbsd_handle_debug_trap (fbsd_nat_target *target, ptid_t ptid, | |
1114 | const struct ptrace_lwpinfo &pl) | |
1115 | { | |
1116 | ||
1117 | /* Ignore traps without valid siginfo or for signals other than | |
1118 | SIGTRAP. | |
1119 | ||
1120 | FreeBSD kernels prior to r341800 can return stale siginfo for at | |
1121 | least some events, but those events can be identified by | |
1122 | additional flags set in pl_flags. True breakpoint and | |
1123 | single-step traps should not have other flags set in | |
1124 | pl_flags. */ | |
1125 | if (pl.pl_flags != PL_FLAG_SI || pl.pl_siginfo.si_signo != SIGTRAP) | |
1126 | return false; | |
1127 | ||
1128 | /* Trace traps are either a single step or a hardware watchpoint or | |
1129 | breakpoint. */ | |
1130 | if (pl.pl_siginfo.si_code == TRAP_TRACE) | |
1131 | { | |
1132 | if (debug_fbsd_nat) | |
1133 | fprintf_unfiltered (gdb_stdlog, | |
1134 | "FNAT: trace trap for LWP %ld\n", ptid.lwp ()); | |
1135 | return true; | |
1136 | } | |
1137 | ||
1138 | if (pl.pl_siginfo.si_code == TRAP_BRKPT) | |
1139 | { | |
1140 | /* Fixup PC for the software breakpoint. */ | |
1141 | struct regcache *regcache = get_thread_regcache (target, ptid); | |
1142 | struct gdbarch *gdbarch = regcache->arch (); | |
1143 | int decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
1144 | ||
1145 | if (debug_fbsd_nat) | |
1146 | fprintf_unfiltered (gdb_stdlog, | |
1147 | "FNAT: sw breakpoint trap for LWP %ld\n", | |
1148 | ptid.lwp ()); | |
1149 | if (decr_pc != 0) | |
1150 | { | |
1151 | CORE_ADDR pc; | |
1152 | ||
1153 | pc = regcache_read_pc (regcache); | |
1154 | regcache_write_pc (regcache, pc - decr_pc); | |
1155 | } | |
1156 | return true; | |
1157 | } | |
1158 | ||
1159 | return false; | |
1160 | } | |
1161 | #endif | |
1162 | ||
1163 | /* Wait for the child specified by PTID to do something. Return the | |
1164 | process ID of the child, or MINUS_ONE_PTID in case of error; store | |
1165 | the status in *OURSTATUS. */ | |
1166 | ||
1167 | ptid_t | |
1168 | fbsd_nat_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus, | |
1169 | target_wait_flags target_options) | |
1170 | { | |
1171 | ptid_t wptid; | |
1172 | ||
1173 | while (1) | |
1174 | { | |
1175 | #ifndef PTRACE_VFORK | |
1176 | wptid = fbsd_next_vfork_done (); | |
1177 | if (wptid != null_ptid) | |
1178 | { | |
1179 | ourstatus->kind = TARGET_WAITKIND_VFORK_DONE; | |
1180 | return wptid; | |
1181 | } | |
1182 | #endif | |
1183 | wptid = inf_ptrace_target::wait (ptid, ourstatus, target_options); | |
1184 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED) | |
1185 | { | |
1186 | struct ptrace_lwpinfo pl; | |
1187 | pid_t pid; | |
1188 | int status; | |
1189 | ||
1190 | pid = wptid.pid (); | |
1191 | if (ptrace (PT_LWPINFO, pid, (caddr_t) &pl, sizeof pl) == -1) | |
1192 | perror_with_name (("ptrace")); | |
1193 | ||
1194 | wptid = ptid_t (pid, pl.pl_lwpid, 0); | |
1195 | ||
1196 | if (debug_fbsd_nat) | |
1197 | { | |
1198 | fprintf_unfiltered (gdb_stdlog, | |
1199 | "FNAT: stop for LWP %u event %d flags %#x\n", | |
1200 | pl.pl_lwpid, pl.pl_event, pl.pl_flags); | |
1201 | if (pl.pl_flags & PL_FLAG_SI) | |
1202 | fprintf_unfiltered (gdb_stdlog, | |
1203 | "FNAT: si_signo %u si_code %u\n", | |
1204 | pl.pl_siginfo.si_signo, | |
1205 | pl.pl_siginfo.si_code); | |
1206 | } | |
1207 | ||
1208 | #ifdef PT_LWP_EVENTS | |
1209 | if (pl.pl_flags & PL_FLAG_EXITED) | |
1210 | { | |
1211 | /* If GDB attaches to a multi-threaded process, exiting | |
1212 | threads might be skipped during post_attach that | |
1213 | have not yet reported their PL_FLAG_EXITED event. | |
1214 | Ignore EXITED events for an unknown LWP. */ | |
1215 | thread_info *thr = find_thread_ptid (this, wptid); | |
1216 | if (thr != nullptr) | |
1217 | { | |
1218 | if (debug_fbsd_lwp) | |
1219 | fprintf_unfiltered (gdb_stdlog, | |
1220 | "FLWP: deleting thread for LWP %u\n", | |
1221 | pl.pl_lwpid); | |
1222 | if (print_thread_events) | |
1223 | printf_unfiltered (_("[%s exited]\n"), | |
1224 | target_pid_to_str (wptid).c_str ()); | |
1225 | delete_thread (thr); | |
1226 | } | |
1227 | if (ptrace (PT_CONTINUE, pid, (caddr_t) 1, 0) == -1) | |
1228 | perror_with_name (("ptrace")); | |
1229 | continue; | |
1230 | } | |
1231 | #endif | |
1232 | ||
1233 | /* Switch to an LWP PTID on the first stop in a new process. | |
1234 | This is done after handling PL_FLAG_EXITED to avoid | |
1235 | switching to an exited LWP. It is done before checking | |
1236 | PL_FLAG_BORN in case the first stop reported after | |
1237 | attaching to an existing process is a PL_FLAG_BORN | |
1238 | event. */ | |
1239 | if (in_thread_list (this, ptid_t (pid))) | |
1240 | { | |
1241 | if (debug_fbsd_lwp) | |
1242 | fprintf_unfiltered (gdb_stdlog, | |
1243 | "FLWP: using LWP %u for first thread\n", | |
1244 | pl.pl_lwpid); | |
1245 | thread_change_ptid (this, ptid_t (pid), wptid); | |
1246 | } | |
1247 | ||
1248 | #ifdef PT_LWP_EVENTS | |
1249 | if (pl.pl_flags & PL_FLAG_BORN) | |
1250 | { | |
1251 | /* If GDB attaches to a multi-threaded process, newborn | |
1252 | threads might be added by fbsd_add_threads that have | |
1253 | not yet reported their PL_FLAG_BORN event. Ignore | |
1254 | BORN events for an already-known LWP. */ | |
1255 | if (!in_thread_list (this, wptid)) | |
1256 | { | |
1257 | if (debug_fbsd_lwp) | |
1258 | fprintf_unfiltered (gdb_stdlog, | |
1259 | "FLWP: adding thread for LWP %u\n", | |
1260 | pl.pl_lwpid); | |
1261 | add_thread (this, wptid); | |
1262 | } | |
1263 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
1264 | return wptid; | |
1265 | } | |
1266 | #endif | |
1267 | ||
1268 | #ifdef TDP_RFPPWAIT | |
1269 | if (pl.pl_flags & PL_FLAG_FORKED) | |
1270 | { | |
1271 | #ifndef PTRACE_VFORK | |
1272 | struct kinfo_proc kp; | |
1273 | #endif | |
1274 | ptid_t child_ptid; | |
1275 | pid_t child; | |
1276 | ||
1277 | child = pl.pl_child_pid; | |
1278 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
1279 | #ifdef PTRACE_VFORK | |
1280 | if (pl.pl_flags & PL_FLAG_VFORKED) | |
1281 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
1282 | #endif | |
1283 | ||
1284 | /* Make sure the other end of the fork is stopped too. */ | |
1285 | child_ptid = fbsd_is_child_pending (child); | |
1286 | if (child_ptid == null_ptid) | |
1287 | { | |
1288 | pid = waitpid (child, &status, 0); | |
1289 | if (pid == -1) | |
1290 | perror_with_name (("waitpid")); | |
1291 | ||
1292 | gdb_assert (pid == child); | |
1293 | ||
1294 | if (ptrace (PT_LWPINFO, child, (caddr_t)&pl, sizeof pl) == -1) | |
1295 | perror_with_name (("ptrace")); | |
1296 | ||
1297 | gdb_assert (pl.pl_flags & PL_FLAG_CHILD); | |
1298 | child_ptid = ptid_t (child, pl.pl_lwpid, 0); | |
1299 | } | |
1300 | ||
1301 | /* Enable additional events on the child process. */ | |
1302 | fbsd_enable_proc_events (child_ptid.pid ()); | |
1303 | ||
1304 | #ifndef PTRACE_VFORK | |
1305 | /* For vfork, the child process will have the P_PPWAIT | |
1306 | flag set. */ | |
1307 | if (fbsd_fetch_kinfo_proc (child, &kp)) | |
1308 | { | |
1309 | if (kp.ki_flag & P_PPWAIT) | |
1310 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
1311 | } | |
1312 | else | |
1313 | warning (_("Failed to fetch process information")); | |
1314 | #endif | |
1315 | ourstatus->value.related_pid = child_ptid; | |
1316 | ||
1317 | return wptid; | |
1318 | } | |
1319 | ||
1320 | if (pl.pl_flags & PL_FLAG_CHILD) | |
1321 | { | |
1322 | /* Remember that this child forked, but do not report it | |
1323 | until the parent reports its corresponding fork | |
1324 | event. */ | |
1325 | fbsd_remember_child (wptid); | |
1326 | continue; | |
1327 | } | |
1328 | ||
1329 | #ifdef PTRACE_VFORK | |
1330 | if (pl.pl_flags & PL_FLAG_VFORK_DONE) | |
1331 | { | |
1332 | ourstatus->kind = TARGET_WAITKIND_VFORK_DONE; | |
1333 | return wptid; | |
1334 | } | |
1335 | #endif | |
1336 | #endif | |
1337 | ||
1338 | if (pl.pl_flags & PL_FLAG_EXEC) | |
1339 | { | |
1340 | ourstatus->kind = TARGET_WAITKIND_EXECD; | |
1341 | ourstatus->value.execd_pathname | |
1342 | = xstrdup (pid_to_exec_file (pid)); | |
1343 | return wptid; | |
1344 | } | |
1345 | ||
1346 | #ifdef USE_SIGTRAP_SIGINFO | |
1347 | if (fbsd_handle_debug_trap (this, wptid, pl)) | |
1348 | return wptid; | |
1349 | #endif | |
1350 | ||
1351 | /* Note that PL_FLAG_SCE is set for any event reported while | |
1352 | a thread is executing a system call in the kernel. In | |
1353 | particular, signals that interrupt a sleep in a system | |
1354 | call will report this flag as part of their event. Stops | |
1355 | explicitly for system call entry and exit always use | |
1356 | SIGTRAP, so only treat SIGTRAP events as system call | |
1357 | entry/exit events. */ | |
1358 | if (pl.pl_flags & (PL_FLAG_SCE | PL_FLAG_SCX) | |
1359 | && ourstatus->value.sig == SIGTRAP) | |
1360 | { | |
1361 | #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE | |
1362 | if (catch_syscall_enabled ()) | |
1363 | { | |
1364 | if (catching_syscall_number (pl.pl_syscall_code)) | |
1365 | { | |
1366 | if (pl.pl_flags & PL_FLAG_SCE) | |
1367 | ourstatus->kind = TARGET_WAITKIND_SYSCALL_ENTRY; | |
1368 | else | |
1369 | ourstatus->kind = TARGET_WAITKIND_SYSCALL_RETURN; | |
1370 | ourstatus->value.syscall_number = pl.pl_syscall_code; | |
1371 | return wptid; | |
1372 | } | |
1373 | } | |
1374 | #endif | |
1375 | /* If the core isn't interested in this event, just | |
1376 | continue the process explicitly and wait for another | |
1377 | event. Note that PT_SYSCALL is "sticky" on FreeBSD | |
1378 | and once system call stops are enabled on a process | |
1379 | it stops for all system call entries and exits. */ | |
1380 | if (ptrace (PT_CONTINUE, pid, (caddr_t) 1, 0) == -1) | |
1381 | perror_with_name (("ptrace")); | |
1382 | continue; | |
1383 | } | |
1384 | } | |
1385 | return wptid; | |
1386 | } | |
1387 | } | |
1388 | ||
1389 | #ifdef USE_SIGTRAP_SIGINFO | |
1390 | /* Implement the "stopped_by_sw_breakpoint" target_ops method. */ | |
1391 | ||
1392 | bool | |
1393 | fbsd_nat_target::stopped_by_sw_breakpoint () | |
1394 | { | |
1395 | struct ptrace_lwpinfo pl; | |
1396 | ||
1397 | if (ptrace (PT_LWPINFO, get_ptrace_pid (inferior_ptid), (caddr_t) &pl, | |
1398 | sizeof pl) == -1) | |
1399 | return false; | |
1400 | ||
1401 | return (pl.pl_flags == PL_FLAG_SI | |
1402 | && pl.pl_siginfo.si_signo == SIGTRAP | |
1403 | && pl.pl_siginfo.si_code == TRAP_BRKPT); | |
1404 | } | |
1405 | ||
1406 | /* Implement the "supports_stopped_by_sw_breakpoint" target_ops | |
1407 | method. */ | |
1408 | ||
1409 | bool | |
1410 | fbsd_nat_target::supports_stopped_by_sw_breakpoint () | |
1411 | { | |
1412 | return true; | |
1413 | } | |
1414 | #endif | |
1415 | ||
1416 | #ifdef TDP_RFPPWAIT | |
1417 | /* Target hook for follow_fork. On entry and at return inferior_ptid is | |
1418 | the ptid of the followed inferior. */ | |
1419 | ||
1420 | bool | |
1421 | fbsd_nat_target::follow_fork (bool follow_child, bool detach_fork) | |
1422 | { | |
1423 | if (!follow_child && detach_fork) | |
1424 | { | |
1425 | struct thread_info *tp = inferior_thread (); | |
1426 | pid_t child_pid = tp->pending_follow.value.related_pid.pid (); | |
1427 | ||
1428 | /* Breakpoints have already been detached from the child by | |
1429 | infrun.c. */ | |
1430 | ||
1431 | if (ptrace (PT_DETACH, child_pid, (PTRACE_TYPE_ARG3)1, 0) == -1) | |
1432 | perror_with_name (("ptrace")); | |
1433 | ||
1434 | #ifndef PTRACE_VFORK | |
1435 | if (tp->pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1436 | { | |
1437 | /* We can't insert breakpoints until the child process has | |
1438 | finished with the shared memory region. The parent | |
1439 | process doesn't wait for the child process to exit or | |
1440 | exec until after it has been resumed from the ptrace stop | |
1441 | to report the fork. Once it has been resumed it doesn't | |
1442 | stop again before returning to userland, so there is no | |
1443 | reliable way to wait on the parent. | |
1444 | ||
1445 | We can't stay attached to the child to wait for an exec | |
1446 | or exit because it may invoke ptrace(PT_TRACE_ME) | |
1447 | (e.g. if the parent process is a debugger forking a new | |
1448 | child process). | |
1449 | ||
1450 | In the end, the best we can do is to make sure it runs | |
1451 | for a little while. Hopefully it will be out of range of | |
1452 | any breakpoints we reinsert. Usually this is only the | |
1453 | single-step breakpoint at vfork's return point. */ | |
1454 | ||
1455 | usleep (10000); | |
1456 | ||
1457 | /* Schedule a fake VFORK_DONE event to report on the next | |
1458 | wait. */ | |
1459 | fbsd_add_vfork_done (inferior_ptid); | |
1460 | } | |
1461 | #endif | |
1462 | } | |
1463 | ||
1464 | return false; | |
1465 | } | |
1466 | ||
1467 | int | |
1468 | fbsd_nat_target::insert_fork_catchpoint (int pid) | |
1469 | { | |
1470 | return 0; | |
1471 | } | |
1472 | ||
1473 | int | |
1474 | fbsd_nat_target::remove_fork_catchpoint (int pid) | |
1475 | { | |
1476 | return 0; | |
1477 | } | |
1478 | ||
1479 | int | |
1480 | fbsd_nat_target::insert_vfork_catchpoint (int pid) | |
1481 | { | |
1482 | return 0; | |
1483 | } | |
1484 | ||
1485 | int | |
1486 | fbsd_nat_target::remove_vfork_catchpoint (int pid) | |
1487 | { | |
1488 | return 0; | |
1489 | } | |
1490 | #endif | |
1491 | ||
1492 | /* Implement the "post_startup_inferior" target_ops method. */ | |
1493 | ||
1494 | void | |
1495 | fbsd_nat_target::post_startup_inferior (ptid_t pid) | |
1496 | { | |
1497 | fbsd_enable_proc_events (pid.pid ()); | |
1498 | } | |
1499 | ||
1500 | /* Implement the "post_attach" target_ops method. */ | |
1501 | ||
1502 | void | |
1503 | fbsd_nat_target::post_attach (int pid) | |
1504 | { | |
1505 | fbsd_enable_proc_events (pid); | |
1506 | fbsd_add_threads (this, pid); | |
1507 | } | |
1508 | ||
1509 | /* Traced processes always stop after exec. */ | |
1510 | ||
1511 | int | |
1512 | fbsd_nat_target::insert_exec_catchpoint (int pid) | |
1513 | { | |
1514 | return 0; | |
1515 | } | |
1516 | ||
1517 | int | |
1518 | fbsd_nat_target::remove_exec_catchpoint (int pid) | |
1519 | { | |
1520 | return 0; | |
1521 | } | |
1522 | ||
1523 | #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE | |
1524 | int | |
1525 | fbsd_nat_target::set_syscall_catchpoint (int pid, bool needed, | |
1526 | int any_count, | |
1527 | gdb::array_view<const int> syscall_counts) | |
1528 | { | |
1529 | ||
1530 | /* Ignore the arguments. inf-ptrace.c will use PT_SYSCALL which | |
1531 | will catch all system call entries and exits. The system calls | |
1532 | are filtered by GDB rather than the kernel. */ | |
1533 | return 0; | |
1534 | } | |
1535 | #endif | |
1536 | ||
1537 | bool | |
1538 | fbsd_nat_target::supports_multi_process () | |
1539 | { | |
1540 | return true; | |
1541 | } | |
1542 | ||
1543 | void _initialize_fbsd_nat (); | |
1544 | void | |
1545 | _initialize_fbsd_nat () | |
1546 | { | |
1547 | add_setshow_boolean_cmd ("fbsd-lwp", class_maintenance, | |
1548 | &debug_fbsd_lwp, _("\ | |
1549 | Set debugging of FreeBSD lwp module."), _("\ | |
1550 | Show debugging of FreeBSD lwp module."), _("\ | |
1551 | Enables printf debugging output."), | |
1552 | NULL, | |
1553 | &show_fbsd_lwp_debug, | |
1554 | &setdebuglist, &showdebuglist); | |
1555 | add_setshow_boolean_cmd ("fbsd-nat", class_maintenance, | |
1556 | &debug_fbsd_nat, _("\ | |
1557 | Set debugging of FreeBSD native target."), _("\ | |
1558 | Show debugging of FreeBSD native target."), _("\ | |
1559 | Enables printf debugging output."), | |
1560 | NULL, | |
1561 | &show_fbsd_nat_debug, | |
1562 | &setdebuglist, &showdebuglist); | |
1563 | } |