| 1 | /* Native-dependent code for FreeBSD. |
| 2 | |
| 3 | Copyright (C) 2002-2019 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 "common/byte-vector.h" |
| 22 | #include "gdbcore.h" |
| 23 | #include "inferior.h" |
| 24 | #include "regcache.h" |
| 25 | #include "regset.h" |
| 26 | #include "gdbcmd.h" |
| 27 | #include "gdbthread.h" |
| 28 | #include "common/gdb_wait.h" |
| 29 | #include "inf-ptrace.h" |
| 30 | #include <sys/types.h> |
| 31 | #include <sys/procfs.h> |
| 32 | #include <sys/ptrace.h> |
| 33 | #include <sys/signal.h> |
| 34 | #include <sys/sysctl.h> |
| 35 | #include <sys/user.h> |
| 36 | #if defined(HAVE_KINFO_GETFILE) || defined(HAVE_KINFO_GETVMMAP) |
| 37 | #include <libutil.h> |
| 38 | #endif |
| 39 | #if !defined(HAVE_KINFO_GETVMMAP) |
| 40 | #include "common/filestuff.h" |
| 41 | #endif |
| 42 | |
| 43 | #include "elf-bfd.h" |
| 44 | #include "fbsd-nat.h" |
| 45 | #include "fbsd-tdep.h" |
| 46 | |
| 47 | #include <list> |
| 48 | |
| 49 | /* Return the name of a file that can be opened to get the symbols for |
| 50 | the child process identified by PID. */ |
| 51 | |
| 52 | char * |
| 53 | fbsd_nat_target::pid_to_exec_file (int pid) |
| 54 | { |
| 55 | ssize_t len; |
| 56 | static char buf[PATH_MAX]; |
| 57 | char name[PATH_MAX]; |
| 58 | |
| 59 | #ifdef KERN_PROC_PATHNAME |
| 60 | size_t buflen; |
| 61 | int mib[4]; |
| 62 | |
| 63 | mib[0] = CTL_KERN; |
| 64 | mib[1] = KERN_PROC; |
| 65 | mib[2] = KERN_PROC_PATHNAME; |
| 66 | mib[3] = pid; |
| 67 | buflen = sizeof buf; |
| 68 | if (sysctl (mib, 4, buf, &buflen, NULL, 0) == 0) |
| 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; |
| 73 | #endif |
| 74 | |
| 75 | xsnprintf (name, PATH_MAX, "/proc/%d/exe", pid); |
| 76 | len = readlink (name, buf, PATH_MAX - 1); |
| 77 | if (len != -1) |
| 78 | { |
| 79 | buf[len] = '\0'; |
| 80 | return buf; |
| 81 | } |
| 82 | |
| 83 | return NULL; |
| 84 | } |
| 85 | |
| 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 | |
| 91 | int |
| 92 | fbsd_nat_target::find_memory_regions (find_memory_region_ftype func, |
| 93 | void *obfd) |
| 94 | { |
| 95 | pid_t pid = inferior_ptid.pid (); |
| 96 | struct kinfo_vmentry *kve; |
| 97 | uint64_t size; |
| 98 | int i, nitems; |
| 99 | |
| 100 | gdb::unique_xmalloc_ptr<struct kinfo_vmentry> |
| 101 | vmentl (kinfo_getvmmap (pid, &nitems)); |
| 102 | if (vmentl == NULL) |
| 103 | perror_with_name (_("Couldn't fetch VM map entries.")); |
| 104 | |
| 105 | for (i = 0, kve = vmentl.get (); i < nitems; i++, kve++) |
| 106 | { |
| 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 | } |
| 137 | return 0; |
| 138 | } |
| 139 | #else |
| 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 | |
| 165 | int |
| 166 | fbsd_nat_target::find_memory_regions (find_memory_region_ftype func, |
| 167 | void *obfd) |
| 168 | { |
| 169 | pid_t pid = inferior_ptid.pid (); |
| 170 | unsigned long start, end, size; |
| 171 | char protection[4]; |
| 172 | int read, write, exec; |
| 173 | |
| 174 | std::string mapfilename = string_printf ("/proc/%ld/map", (long) pid); |
| 175 | gdb_file_up mapfile (fopen (mapfilename.c_str (), "r")); |
| 176 | if (mapfile == NULL) |
| 177 | error (_("Couldn't open %s."), mapfilename.c_str ()); |
| 178 | |
| 179 | if (info_verbose) |
| 180 | fprintf_filtered (gdb_stdout, |
| 181 | "Reading memory regions from %s\n", mapfilename.c_str ()); |
| 182 | |
| 183 | /* Now iterate until end-of-file. */ |
| 184 | while (fbsd_read_mapping (mapfile.get (), &start, &end, &protection[0])) |
| 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, |
| 195 | "Save segment, %ld bytes at %s (%c%c%c)\n", |
| 196 | size, paddress (target_gdbarch (), start), |
| 197 | read ? 'r' : '-', |
| 198 | write ? 'w' : '-', |
| 199 | exec ? 'x' : '-'); |
| 200 | } |
| 201 | |
| 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); |
| 205 | } |
| 206 | |
| 207 | return 0; |
| 208 | } |
| 209 | #endif |
| 210 | |
| 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 | /* Join the arguments with spaces to form a single string. */ |
| 235 | char *cp = cmdline.get (); |
| 236 | for (size_t i = 0; i < len - 1; i++) |
| 237 | if (cp[i] == '\0') |
| 238 | cp[i] = ' '; |
| 239 | cp[len - 1] = '\0'; |
| 240 | |
| 241 | return cmdline; |
| 242 | } |
| 243 | |
| 244 | /* Fetch the external variant of the kernel's internal process |
| 245 | structure for the process PID into KP. */ |
| 246 | |
| 247 | static bool |
| 248 | fbsd_fetch_kinfo_proc (pid_t pid, struct kinfo_proc *kp) |
| 249 | { |
| 250 | size_t len; |
| 251 | int mib[4]; |
| 252 | |
| 253 | len = sizeof *kp; |
| 254 | mib[0] = CTL_KERN; |
| 255 | mib[1] = KERN_PROC; |
| 256 | mib[2] = KERN_PROC_PID; |
| 257 | mib[3] = pid; |
| 258 | return (sysctl (mib, 4, kp, &len, NULL, 0) == 0); |
| 259 | } |
| 260 | |
| 261 | /* Implement the "info_proc" target_ops method. */ |
| 262 | |
| 263 | bool |
| 264 | fbsd_nat_target::info_proc (const char *args, enum info_proc_what what) |
| 265 | { |
| 266 | #ifdef HAVE_KINFO_GETFILE |
| 267 | gdb::unique_xmalloc_ptr<struct kinfo_file> fdtbl; |
| 268 | int nfd = 0; |
| 269 | #endif |
| 270 | struct kinfo_proc kp; |
| 271 | pid_t pid; |
| 272 | bool do_cmdline = false; |
| 273 | bool do_cwd = false; |
| 274 | bool do_exe = false; |
| 275 | #ifdef HAVE_KINFO_GETFILE |
| 276 | bool do_files = false; |
| 277 | #endif |
| 278 | #ifdef HAVE_KINFO_GETVMMAP |
| 279 | bool do_mappings = false; |
| 280 | #endif |
| 281 | bool do_status = false; |
| 282 | |
| 283 | switch (what) |
| 284 | { |
| 285 | case IP_MINIMAL: |
| 286 | do_cmdline = true; |
| 287 | do_cwd = true; |
| 288 | do_exe = true; |
| 289 | break; |
| 290 | #ifdef HAVE_KINFO_GETVMMAP |
| 291 | case IP_MAPPINGS: |
| 292 | do_mappings = true; |
| 293 | break; |
| 294 | #endif |
| 295 | case IP_STATUS: |
| 296 | case IP_STAT: |
| 297 | do_status = true; |
| 298 | break; |
| 299 | case IP_CMDLINE: |
| 300 | do_cmdline = true; |
| 301 | break; |
| 302 | case IP_EXE: |
| 303 | do_exe = true; |
| 304 | break; |
| 305 | case IP_CWD: |
| 306 | do_cwd = true; |
| 307 | break; |
| 308 | #ifdef HAVE_KINFO_GETFILE |
| 309 | case IP_FILES: |
| 310 | do_files = true; |
| 311 | break; |
| 312 | #endif |
| 313 | case IP_ALL: |
| 314 | do_cmdline = true; |
| 315 | do_cwd = true; |
| 316 | do_exe = true; |
| 317 | #ifdef HAVE_KINFO_GETFILE |
| 318 | do_files = true; |
| 319 | #endif |
| 320 | #ifdef HAVE_KINFO_GETVMMAP |
| 321 | do_mappings = true; |
| 322 | #endif |
| 323 | do_status = true; |
| 324 | break; |
| 325 | default: |
| 326 | error (_("Not supported on this target.")); |
| 327 | } |
| 328 | |
| 329 | gdb_argv built_argv (args); |
| 330 | if (built_argv.count () == 0) |
| 331 | { |
| 332 | pid = inferior_ptid.pid (); |
| 333 | if (pid == 0) |
| 334 | error (_("No current process: you must name one.")); |
| 335 | } |
| 336 | else if (built_argv.count () == 1 && isdigit (built_argv[0][0])) |
| 337 | pid = strtol (built_argv[0], NULL, 10); |
| 338 | else |
| 339 | error (_("Invalid arguments.")); |
| 340 | |
| 341 | printf_filtered (_("process %d\n"), pid); |
| 342 | #ifdef HAVE_KINFO_GETFILE |
| 343 | if (do_cwd || do_exe || do_files) |
| 344 | fdtbl.reset (kinfo_getfile (pid, &nfd)); |
| 345 | #endif |
| 346 | |
| 347 | if (do_cmdline) |
| 348 | { |
| 349 | gdb::unique_xmalloc_ptr<char> cmdline = fbsd_fetch_cmdline (pid); |
| 350 | if (cmdline != nullptr) |
| 351 | printf_filtered ("cmdline = '%s'\n", cmdline.get ()); |
| 352 | else |
| 353 | warning (_("unable to fetch command line")); |
| 354 | } |
| 355 | if (do_cwd) |
| 356 | { |
| 357 | const char *cwd = NULL; |
| 358 | #ifdef HAVE_KINFO_GETFILE |
| 359 | struct kinfo_file *kf = fdtbl.get (); |
| 360 | for (int i = 0; i < nfd; i++, kf++) |
| 361 | { |
| 362 | if (kf->kf_type == KF_TYPE_VNODE && kf->kf_fd == KF_FD_TYPE_CWD) |
| 363 | { |
| 364 | cwd = kf->kf_path; |
| 365 | break; |
| 366 | } |
| 367 | } |
| 368 | #endif |
| 369 | if (cwd != NULL) |
| 370 | printf_filtered ("cwd = '%s'\n", cwd); |
| 371 | else |
| 372 | warning (_("unable to fetch current working directory")); |
| 373 | } |
| 374 | if (do_exe) |
| 375 | { |
| 376 | const char *exe = NULL; |
| 377 | #ifdef HAVE_KINFO_GETFILE |
| 378 | struct kinfo_file *kf = fdtbl.get (); |
| 379 | for (int i = 0; i < nfd; i++, kf++) |
| 380 | { |
| 381 | if (kf->kf_type == KF_TYPE_VNODE && kf->kf_fd == KF_FD_TYPE_TEXT) |
| 382 | { |
| 383 | exe = kf->kf_path; |
| 384 | break; |
| 385 | } |
| 386 | } |
| 387 | #endif |
| 388 | if (exe == NULL) |
| 389 | exe = pid_to_exec_file (pid); |
| 390 | if (exe != NULL) |
| 391 | printf_filtered ("exe = '%s'\n", exe); |
| 392 | else |
| 393 | warning (_("unable to fetch executable path name")); |
| 394 | } |
| 395 | #ifdef HAVE_KINFO_GETFILE |
| 396 | if (do_files) |
| 397 | { |
| 398 | struct kinfo_file *kf = fdtbl.get (); |
| 399 | |
| 400 | if (nfd > 0) |
| 401 | { |
| 402 | fbsd_info_proc_files_header (); |
| 403 | for (int i = 0; i < nfd; i++, kf++) |
| 404 | fbsd_info_proc_files_entry (kf->kf_type, kf->kf_fd, kf->kf_flags, |
| 405 | kf->kf_offset, kf->kf_vnode_type, |
| 406 | kf->kf_sock_domain, kf->kf_sock_type, |
| 407 | kf->kf_sock_protocol, &kf->kf_sa_local, |
| 408 | &kf->kf_sa_peer, kf->kf_path); |
| 409 | } |
| 410 | else |
| 411 | warning (_("unable to fetch list of open files")); |
| 412 | } |
| 413 | #endif |
| 414 | #ifdef HAVE_KINFO_GETVMMAP |
| 415 | if (do_mappings) |
| 416 | { |
| 417 | int nvment; |
| 418 | gdb::unique_xmalloc_ptr<struct kinfo_vmentry> |
| 419 | vmentl (kinfo_getvmmap (pid, &nvment)); |
| 420 | |
| 421 | if (vmentl != nullptr) |
| 422 | { |
| 423 | int addr_bit = TARGET_CHAR_BIT * sizeof (void *); |
| 424 | fbsd_info_proc_mappings_header (addr_bit); |
| 425 | |
| 426 | struct kinfo_vmentry *kve = vmentl.get (); |
| 427 | for (int i = 0; i < nvment; i++, kve++) |
| 428 | fbsd_info_proc_mappings_entry (addr_bit, kve->kve_start, |
| 429 | kve->kve_end, kve->kve_offset, |
| 430 | kve->kve_flags, kve->kve_protection, |
| 431 | kve->kve_path); |
| 432 | } |
| 433 | else |
| 434 | warning (_("unable to fetch virtual memory map")); |
| 435 | } |
| 436 | #endif |
| 437 | if (do_status) |
| 438 | { |
| 439 | if (!fbsd_fetch_kinfo_proc (pid, &kp)) |
| 440 | warning (_("Failed to fetch process information")); |
| 441 | else |
| 442 | { |
| 443 | const char *state; |
| 444 | int pgtok; |
| 445 | |
| 446 | printf_filtered ("Name: %s\n", kp.ki_comm); |
| 447 | switch (kp.ki_stat) |
| 448 | { |
| 449 | case SIDL: |
| 450 | state = "I (idle)"; |
| 451 | break; |
| 452 | case SRUN: |
| 453 | state = "R (running)"; |
| 454 | break; |
| 455 | case SSTOP: |
| 456 | state = "T (stopped)"; |
| 457 | break; |
| 458 | case SZOMB: |
| 459 | state = "Z (zombie)"; |
| 460 | break; |
| 461 | case SSLEEP: |
| 462 | state = "S (sleeping)"; |
| 463 | break; |
| 464 | case SWAIT: |
| 465 | state = "W (interrupt wait)"; |
| 466 | break; |
| 467 | case SLOCK: |
| 468 | state = "L (blocked on lock)"; |
| 469 | break; |
| 470 | default: |
| 471 | state = "? (unknown)"; |
| 472 | break; |
| 473 | } |
| 474 | printf_filtered ("State: %s\n", state); |
| 475 | printf_filtered ("Parent process: %d\n", kp.ki_ppid); |
| 476 | printf_filtered ("Process group: %d\n", kp.ki_pgid); |
| 477 | printf_filtered ("Session id: %d\n", kp.ki_sid); |
| 478 | printf_filtered ("TTY: %ju\n", (uintmax_t) kp.ki_tdev); |
| 479 | printf_filtered ("TTY owner process group: %d\n", kp.ki_tpgid); |
| 480 | printf_filtered ("User IDs (real, effective, saved): %d %d %d\n", |
| 481 | kp.ki_ruid, kp.ki_uid, kp.ki_svuid); |
| 482 | printf_filtered ("Group IDs (real, effective, saved): %d %d %d\n", |
| 483 | kp.ki_rgid, kp.ki_groups[0], kp.ki_svgid); |
| 484 | printf_filtered ("Groups: "); |
| 485 | for (int i = 0; i < kp.ki_ngroups; i++) |
| 486 | printf_filtered ("%d ", kp.ki_groups[i]); |
| 487 | printf_filtered ("\n"); |
| 488 | printf_filtered ("Minor faults (no memory page): %ld\n", |
| 489 | kp.ki_rusage.ru_minflt); |
| 490 | printf_filtered ("Minor faults, children: %ld\n", |
| 491 | kp.ki_rusage_ch.ru_minflt); |
| 492 | printf_filtered ("Major faults (memory page faults): %ld\n", |
| 493 | kp.ki_rusage.ru_majflt); |
| 494 | printf_filtered ("Major faults, children: %ld\n", |
| 495 | kp.ki_rusage_ch.ru_majflt); |
| 496 | printf_filtered ("utime: %jd.%06ld\n", |
| 497 | (intmax_t) kp.ki_rusage.ru_utime.tv_sec, |
| 498 | kp.ki_rusage.ru_utime.tv_usec); |
| 499 | printf_filtered ("stime: %jd.%06ld\n", |
| 500 | (intmax_t) kp.ki_rusage.ru_stime.tv_sec, |
| 501 | kp.ki_rusage.ru_stime.tv_usec); |
| 502 | printf_filtered ("utime, children: %jd.%06ld\n", |
| 503 | (intmax_t) kp.ki_rusage_ch.ru_utime.tv_sec, |
| 504 | kp.ki_rusage_ch.ru_utime.tv_usec); |
| 505 | printf_filtered ("stime, children: %jd.%06ld\n", |
| 506 | (intmax_t) kp.ki_rusage_ch.ru_stime.tv_sec, |
| 507 | kp.ki_rusage_ch.ru_stime.tv_usec); |
| 508 | printf_filtered ("'nice' value: %d\n", kp.ki_nice); |
| 509 | printf_filtered ("Start time: %jd.%06ld\n", kp.ki_start.tv_sec, |
| 510 | kp.ki_start.tv_usec); |
| 511 | pgtok = getpagesize () / 1024; |
| 512 | printf_filtered ("Virtual memory size: %ju kB\n", |
| 513 | (uintmax_t) kp.ki_size / 1024); |
| 514 | printf_filtered ("Data size: %ju kB\n", |
| 515 | (uintmax_t) kp.ki_dsize * pgtok); |
| 516 | printf_filtered ("Stack size: %ju kB\n", |
| 517 | (uintmax_t) kp.ki_ssize * pgtok); |
| 518 | printf_filtered ("Text size: %ju kB\n", |
| 519 | (uintmax_t) kp.ki_tsize * pgtok); |
| 520 | printf_filtered ("Resident set size: %ju kB\n", |
| 521 | (uintmax_t) kp.ki_rssize * pgtok); |
| 522 | printf_filtered ("Maximum RSS: %ju kB\n", |
| 523 | (uintmax_t) kp.ki_rusage.ru_maxrss); |
| 524 | printf_filtered ("Pending Signals: "); |
| 525 | for (int i = 0; i < _SIG_WORDS; i++) |
| 526 | printf_filtered ("%08x ", kp.ki_siglist.__bits[i]); |
| 527 | printf_filtered ("\n"); |
| 528 | printf_filtered ("Ignored Signals: "); |
| 529 | for (int i = 0; i < _SIG_WORDS; i++) |
| 530 | printf_filtered ("%08x ", kp.ki_sigignore.__bits[i]); |
| 531 | printf_filtered ("\n"); |
| 532 | printf_filtered ("Caught Signals: "); |
| 533 | for (int i = 0; i < _SIG_WORDS; i++) |
| 534 | printf_filtered ("%08x ", kp.ki_sigcatch.__bits[i]); |
| 535 | printf_filtered ("\n"); |
| 536 | } |
| 537 | } |
| 538 | |
| 539 | return true; |
| 540 | } |
| 541 | |
| 542 | /* |
| 543 | * The current layout of siginfo_t on FreeBSD was adopted in SVN |
| 544 | * revision 153154 which shipped in FreeBSD versions 7.0 and later. |
| 545 | * Don't bother supporting the older layout on older kernels. The |
| 546 | * older format was also never used in core dump notes. |
| 547 | */ |
| 548 | #if __FreeBSD_version >= 700009 |
| 549 | #define USE_SIGINFO |
| 550 | #endif |
| 551 | |
| 552 | #ifdef USE_SIGINFO |
| 553 | /* Return the size of siginfo for the current inferior. */ |
| 554 | |
| 555 | #ifdef __LP64__ |
| 556 | union sigval32 { |
| 557 | int sival_int; |
| 558 | uint32_t sival_ptr; |
| 559 | }; |
| 560 | |
| 561 | /* This structure matches the naming and layout of `siginfo_t' in |
| 562 | <sys/signal.h>. In particular, the `si_foo' macros defined in that |
| 563 | header can be used with both types to copy fields in the `_reason' |
| 564 | union. */ |
| 565 | |
| 566 | struct siginfo32 |
| 567 | { |
| 568 | int si_signo; |
| 569 | int si_errno; |
| 570 | int si_code; |
| 571 | __pid_t si_pid; |
| 572 | __uid_t si_uid; |
| 573 | int si_status; |
| 574 | uint32_t si_addr; |
| 575 | union sigval32 si_value; |
| 576 | union |
| 577 | { |
| 578 | struct |
| 579 | { |
| 580 | int _trapno; |
| 581 | } _fault; |
| 582 | struct |
| 583 | { |
| 584 | int _timerid; |
| 585 | int _overrun; |
| 586 | } _timer; |
| 587 | struct |
| 588 | { |
| 589 | int _mqd; |
| 590 | } _mesgq; |
| 591 | struct |
| 592 | { |
| 593 | int32_t _band; |
| 594 | } _poll; |
| 595 | struct |
| 596 | { |
| 597 | int32_t __spare1__; |
| 598 | int __spare2__[7]; |
| 599 | } __spare__; |
| 600 | } _reason; |
| 601 | }; |
| 602 | #endif |
| 603 | |
| 604 | static size_t |
| 605 | fbsd_siginfo_size () |
| 606 | { |
| 607 | #ifdef __LP64__ |
| 608 | struct gdbarch *gdbarch = get_frame_arch (get_current_frame ()); |
| 609 | |
| 610 | /* Is the inferior 32-bit? If so, use the 32-bit siginfo size. */ |
| 611 | if (gdbarch_long_bit (gdbarch) == 32) |
| 612 | return sizeof (struct siginfo32); |
| 613 | #endif |
| 614 | return sizeof (siginfo_t); |
| 615 | } |
| 616 | |
| 617 | /* Convert a native 64-bit siginfo object to a 32-bit object. Note |
| 618 | that FreeBSD doesn't support writing to $_siginfo, so this only |
| 619 | needs to convert one way. */ |
| 620 | |
| 621 | static void |
| 622 | fbsd_convert_siginfo (siginfo_t *si) |
| 623 | { |
| 624 | #ifdef __LP64__ |
| 625 | struct gdbarch *gdbarch = get_frame_arch (get_current_frame ()); |
| 626 | |
| 627 | /* Is the inferior 32-bit? If not, nothing to do. */ |
| 628 | if (gdbarch_long_bit (gdbarch) != 32) |
| 629 | return; |
| 630 | |
| 631 | struct siginfo32 si32; |
| 632 | |
| 633 | si32.si_signo = si->si_signo; |
| 634 | si32.si_errno = si->si_errno; |
| 635 | si32.si_code = si->si_code; |
| 636 | si32.si_pid = si->si_pid; |
| 637 | si32.si_uid = si->si_uid; |
| 638 | si32.si_status = si->si_status; |
| 639 | si32.si_addr = (uintptr_t) si->si_addr; |
| 640 | |
| 641 | /* If sival_ptr is being used instead of sival_int on a big-endian |
| 642 | platform, then sival_int will be zero since it holds the upper |
| 643 | 32-bits of the pointer value. */ |
| 644 | #if _BYTE_ORDER == _BIG_ENDIAN |
| 645 | if (si->si_value.sival_int == 0) |
| 646 | si32.si_value.sival_ptr = (uintptr_t) si->si_value.sival_ptr; |
| 647 | else |
| 648 | si32.si_value.sival_int = si->si_value.sival_int; |
| 649 | #else |
| 650 | si32.si_value.sival_int = si->si_value.sival_int; |
| 651 | #endif |
| 652 | |
| 653 | /* Always copy the spare fields and then possibly overwrite them for |
| 654 | signal-specific or code-specific fields. */ |
| 655 | si32._reason.__spare__.__spare1__ = si->_reason.__spare__.__spare1__; |
| 656 | for (int i = 0; i < 7; i++) |
| 657 | si32._reason.__spare__.__spare2__[i] = si->_reason.__spare__.__spare2__[i]; |
| 658 | switch (si->si_signo) { |
| 659 | case SIGILL: |
| 660 | case SIGFPE: |
| 661 | case SIGSEGV: |
| 662 | case SIGBUS: |
| 663 | si32.si_trapno = si->si_trapno; |
| 664 | break; |
| 665 | } |
| 666 | switch (si->si_code) { |
| 667 | case SI_TIMER: |
| 668 | si32.si_timerid = si->si_timerid; |
| 669 | si32.si_overrun = si->si_overrun; |
| 670 | break; |
| 671 | case SI_MESGQ: |
| 672 | si32.si_mqd = si->si_mqd; |
| 673 | break; |
| 674 | } |
| 675 | |
| 676 | memcpy(si, &si32, sizeof (si32)); |
| 677 | #endif |
| 678 | } |
| 679 | #endif |
| 680 | |
| 681 | /* Implement the "xfer_partial" target_ops method. */ |
| 682 | |
| 683 | enum target_xfer_status |
| 684 | fbsd_nat_target::xfer_partial (enum target_object object, |
| 685 | const char *annex, gdb_byte *readbuf, |
| 686 | const gdb_byte *writebuf, |
| 687 | ULONGEST offset, ULONGEST len, |
| 688 | ULONGEST *xfered_len) |
| 689 | { |
| 690 | pid_t pid = inferior_ptid.pid (); |
| 691 | |
| 692 | switch (object) |
| 693 | { |
| 694 | #ifdef USE_SIGINFO |
| 695 | case TARGET_OBJECT_SIGNAL_INFO: |
| 696 | { |
| 697 | struct ptrace_lwpinfo pl; |
| 698 | size_t siginfo_size; |
| 699 | |
| 700 | /* FreeBSD doesn't support writing to $_siginfo. */ |
| 701 | if (writebuf != NULL) |
| 702 | return TARGET_XFER_E_IO; |
| 703 | |
| 704 | if (inferior_ptid.lwp_p ()) |
| 705 | pid = inferior_ptid.lwp (); |
| 706 | |
| 707 | siginfo_size = fbsd_siginfo_size (); |
| 708 | if (offset > siginfo_size) |
| 709 | return TARGET_XFER_E_IO; |
| 710 | |
| 711 | if (ptrace (PT_LWPINFO, pid, (PTRACE_TYPE_ARG3) &pl, sizeof (pl)) == -1) |
| 712 | return TARGET_XFER_E_IO; |
| 713 | |
| 714 | if (!(pl.pl_flags & PL_FLAG_SI)) |
| 715 | return TARGET_XFER_E_IO; |
| 716 | |
| 717 | fbsd_convert_siginfo (&pl.pl_siginfo); |
| 718 | if (offset + len > siginfo_size) |
| 719 | len = siginfo_size - offset; |
| 720 | |
| 721 | memcpy (readbuf, ((gdb_byte *) &pl.pl_siginfo) + offset, len); |
| 722 | *xfered_len = len; |
| 723 | return TARGET_XFER_OK; |
| 724 | } |
| 725 | #endif |
| 726 | #ifdef KERN_PROC_AUXV |
| 727 | case TARGET_OBJECT_AUXV: |
| 728 | { |
| 729 | gdb::byte_vector buf_storage; |
| 730 | gdb_byte *buf; |
| 731 | size_t buflen; |
| 732 | int mib[4]; |
| 733 | |
| 734 | if (writebuf != NULL) |
| 735 | return TARGET_XFER_E_IO; |
| 736 | mib[0] = CTL_KERN; |
| 737 | mib[1] = KERN_PROC; |
| 738 | mib[2] = KERN_PROC_AUXV; |
| 739 | mib[3] = pid; |
| 740 | if (offset == 0) |
| 741 | { |
| 742 | buf = readbuf; |
| 743 | buflen = len; |
| 744 | } |
| 745 | else |
| 746 | { |
| 747 | buflen = offset + len; |
| 748 | buf_storage.resize (buflen); |
| 749 | buf = buf_storage.data (); |
| 750 | } |
| 751 | if (sysctl (mib, 4, buf, &buflen, NULL, 0) == 0) |
| 752 | { |
| 753 | if (offset != 0) |
| 754 | { |
| 755 | if (buflen > offset) |
| 756 | { |
| 757 | buflen -= offset; |
| 758 | memcpy (readbuf, buf + offset, buflen); |
| 759 | } |
| 760 | else |
| 761 | buflen = 0; |
| 762 | } |
| 763 | *xfered_len = buflen; |
| 764 | return (buflen == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; |
| 765 | } |
| 766 | return TARGET_XFER_E_IO; |
| 767 | } |
| 768 | #endif |
| 769 | #if defined(KERN_PROC_VMMAP) && defined(KERN_PROC_PS_STRINGS) |
| 770 | case TARGET_OBJECT_FREEBSD_VMMAP: |
| 771 | case TARGET_OBJECT_FREEBSD_PS_STRINGS: |
| 772 | { |
| 773 | gdb::byte_vector buf_storage; |
| 774 | gdb_byte *buf; |
| 775 | size_t buflen; |
| 776 | int mib[4]; |
| 777 | |
| 778 | int proc_target; |
| 779 | uint32_t struct_size; |
| 780 | switch (object) |
| 781 | { |
| 782 | case TARGET_OBJECT_FREEBSD_VMMAP: |
| 783 | proc_target = KERN_PROC_VMMAP; |
| 784 | struct_size = sizeof (struct kinfo_vmentry); |
| 785 | break; |
| 786 | case TARGET_OBJECT_FREEBSD_PS_STRINGS: |
| 787 | proc_target = KERN_PROC_PS_STRINGS; |
| 788 | struct_size = sizeof (void *); |
| 789 | break; |
| 790 | } |
| 791 | |
| 792 | if (writebuf != NULL) |
| 793 | return TARGET_XFER_E_IO; |
| 794 | |
| 795 | mib[0] = CTL_KERN; |
| 796 | mib[1] = KERN_PROC; |
| 797 | mib[2] = proc_target; |
| 798 | mib[3] = pid; |
| 799 | |
| 800 | if (sysctl (mib, 4, NULL, &buflen, NULL, 0) != 0) |
| 801 | return TARGET_XFER_E_IO; |
| 802 | buflen += sizeof (struct_size); |
| 803 | |
| 804 | if (offset >= buflen) |
| 805 | { |
| 806 | *xfered_len = 0; |
| 807 | return TARGET_XFER_EOF; |
| 808 | } |
| 809 | |
| 810 | buf_storage.resize (buflen); |
| 811 | buf = buf_storage.data (); |
| 812 | |
| 813 | memcpy (buf, &struct_size, sizeof (struct_size)); |
| 814 | buflen -= sizeof (struct_size); |
| 815 | if (sysctl (mib, 4, buf + sizeof (struct_size), &buflen, NULL, 0) != 0) |
| 816 | return TARGET_XFER_E_IO; |
| 817 | buflen += sizeof (struct_size); |
| 818 | |
| 819 | if (buflen - offset < len) |
| 820 | len = buflen - offset; |
| 821 | memcpy (readbuf, buf + offset, len); |
| 822 | *xfered_len = len; |
| 823 | return TARGET_XFER_OK; |
| 824 | } |
| 825 | #endif |
| 826 | default: |
| 827 | return inf_ptrace_target::xfer_partial (object, annex, |
| 828 | readbuf, writebuf, offset, |
| 829 | len, xfered_len); |
| 830 | } |
| 831 | } |
| 832 | |
| 833 | #ifdef PT_LWPINFO |
| 834 | static int debug_fbsd_lwp; |
| 835 | static int debug_fbsd_nat; |
| 836 | |
| 837 | static void |
| 838 | show_fbsd_lwp_debug (struct ui_file *file, int from_tty, |
| 839 | struct cmd_list_element *c, const char *value) |
| 840 | { |
| 841 | fprintf_filtered (file, _("Debugging of FreeBSD lwp module is %s.\n"), value); |
| 842 | } |
| 843 | |
| 844 | static void |
| 845 | show_fbsd_nat_debug (struct ui_file *file, int from_tty, |
| 846 | struct cmd_list_element *c, const char *value) |
| 847 | { |
| 848 | fprintf_filtered (file, _("Debugging of FreeBSD native target is %s.\n"), |
| 849 | value); |
| 850 | } |
| 851 | |
| 852 | /* |
| 853 | FreeBSD's first thread support was via a "reentrant" version of libc |
| 854 | (libc_r) that first shipped in 2.2.7. This library multiplexed all |
| 855 | of the threads in a process onto a single kernel thread. This |
| 856 | library was supported via the bsd-uthread target. |
| 857 | |
| 858 | FreeBSD 5.1 introduced two new threading libraries that made use of |
| 859 | multiple kernel threads. The first (libkse) scheduled M user |
| 860 | threads onto N (<= M) kernel threads (LWPs). The second (libthr) |
| 861 | bound each user thread to a dedicated kernel thread. libkse shipped |
| 862 | as the default threading library (libpthread). |
| 863 | |
| 864 | FreeBSD 5.3 added a libthread_db to abstract the interface across |
| 865 | the various thread libraries (libc_r, libkse, and libthr). |
| 866 | |
| 867 | FreeBSD 7.0 switched the default threading library from from libkse |
| 868 | to libpthread and removed libc_r. |
| 869 | |
| 870 | FreeBSD 8.0 removed libkse and the in-kernel support for it. The |
| 871 | only threading library supported by 8.0 and later is libthr which |
| 872 | ties each user thread directly to an LWP. To simplify the |
| 873 | implementation, this target only supports LWP-backed threads using |
| 874 | ptrace directly rather than libthread_db. |
| 875 | |
| 876 | FreeBSD 11.0 introduced LWP event reporting via PT_LWP_EVENTS. |
| 877 | */ |
| 878 | |
| 879 | /* Return true if PTID is still active in the inferior. */ |
| 880 | |
| 881 | bool |
| 882 | fbsd_nat_target::thread_alive (ptid_t ptid) |
| 883 | { |
| 884 | if (ptid.lwp_p ()) |
| 885 | { |
| 886 | struct ptrace_lwpinfo pl; |
| 887 | |
| 888 | if (ptrace (PT_LWPINFO, ptid.lwp (), (caddr_t) &pl, sizeof pl) |
| 889 | == -1) |
| 890 | return false; |
| 891 | #ifdef PL_FLAG_EXITED |
| 892 | if (pl.pl_flags & PL_FLAG_EXITED) |
| 893 | return false; |
| 894 | #endif |
| 895 | } |
| 896 | |
| 897 | return true; |
| 898 | } |
| 899 | |
| 900 | /* Convert PTID to a string. */ |
| 901 | |
| 902 | std::string |
| 903 | fbsd_nat_target::pid_to_str (ptid_t ptid) |
| 904 | { |
| 905 | lwpid_t lwp; |
| 906 | |
| 907 | lwp = ptid.lwp (); |
| 908 | if (lwp != 0) |
| 909 | { |
| 910 | int pid = ptid.pid (); |
| 911 | |
| 912 | return string_printf ("LWP %d of process %d", lwp, pid); |
| 913 | } |
| 914 | |
| 915 | return normal_pid_to_str (ptid); |
| 916 | } |
| 917 | |
| 918 | #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME |
| 919 | /* Return the name assigned to a thread by an application. Returns |
| 920 | the string in a static buffer. */ |
| 921 | |
| 922 | const char * |
| 923 | fbsd_nat_target::thread_name (struct thread_info *thr) |
| 924 | { |
| 925 | struct ptrace_lwpinfo pl; |
| 926 | struct kinfo_proc kp; |
| 927 | int pid = thr->ptid.pid (); |
| 928 | long lwp = thr->ptid.lwp (); |
| 929 | static char buf[sizeof pl.pl_tdname + 1]; |
| 930 | |
| 931 | /* Note that ptrace_lwpinfo returns the process command in pl_tdname |
| 932 | if a name has not been set explicitly. Return a NULL name in |
| 933 | that case. */ |
| 934 | if (!fbsd_fetch_kinfo_proc (pid, &kp)) |
| 935 | perror_with_name (_("Failed to fetch process information")); |
| 936 | if (ptrace (PT_LWPINFO, lwp, (caddr_t) &pl, sizeof pl) == -1) |
| 937 | perror_with_name (("ptrace")); |
| 938 | if (strcmp (kp.ki_comm, pl.pl_tdname) == 0) |
| 939 | return NULL; |
| 940 | xsnprintf (buf, sizeof buf, "%s", pl.pl_tdname); |
| 941 | return buf; |
| 942 | } |
| 943 | #endif |
| 944 | |
| 945 | /* Enable additional event reporting on new processes. |
| 946 | |
| 947 | To catch fork events, PTRACE_FORK is set on every traced process |
| 948 | to enable stops on returns from fork or vfork. Note that both the |
| 949 | parent and child will always stop, even if system call stops are |
| 950 | not enabled. |
| 951 | |
| 952 | To catch LWP events, PTRACE_EVENTS is set on every traced process. |
| 953 | This enables stops on the birth for new LWPs (excluding the "main" LWP) |
| 954 | and the death of LWPs (excluding the last LWP in a process). Note |
| 955 | that unlike fork events, the LWP that creates a new LWP does not |
| 956 | report an event. */ |
| 957 | |
| 958 | static void |
| 959 | fbsd_enable_proc_events (pid_t pid) |
| 960 | { |
| 961 | #ifdef PT_GET_EVENT_MASK |
| 962 | int events; |
| 963 | |
| 964 | if (ptrace (PT_GET_EVENT_MASK, pid, (PTRACE_TYPE_ARG3)&events, |
| 965 | sizeof (events)) == -1) |
| 966 | perror_with_name (("ptrace")); |
| 967 | events |= PTRACE_FORK | PTRACE_LWP; |
| 968 | #ifdef PTRACE_VFORK |
| 969 | events |= PTRACE_VFORK; |
| 970 | #endif |
| 971 | if (ptrace (PT_SET_EVENT_MASK, pid, (PTRACE_TYPE_ARG3)&events, |
| 972 | sizeof (events)) == -1) |
| 973 | perror_with_name (("ptrace")); |
| 974 | #else |
| 975 | #ifdef TDP_RFPPWAIT |
| 976 | if (ptrace (PT_FOLLOW_FORK, pid, (PTRACE_TYPE_ARG3)0, 1) == -1) |
| 977 | perror_with_name (("ptrace")); |
| 978 | #endif |
| 979 | #ifdef PT_LWP_EVENTS |
| 980 | if (ptrace (PT_LWP_EVENTS, pid, (PTRACE_TYPE_ARG3)0, 1) == -1) |
| 981 | perror_with_name (("ptrace")); |
| 982 | #endif |
| 983 | #endif |
| 984 | } |
| 985 | |
| 986 | /* Add threads for any new LWPs in a process. |
| 987 | |
| 988 | When LWP events are used, this function is only used to detect existing |
| 989 | threads when attaching to a process. On older systems, this function is |
| 990 | called to discover new threads each time the thread list is updated. */ |
| 991 | |
| 992 | static void |
| 993 | fbsd_add_threads (pid_t pid) |
| 994 | { |
| 995 | int i, nlwps; |
| 996 | |
| 997 | gdb_assert (!in_thread_list (ptid_t (pid))); |
| 998 | nlwps = ptrace (PT_GETNUMLWPS, pid, NULL, 0); |
| 999 | if (nlwps == -1) |
| 1000 | perror_with_name (("ptrace")); |
| 1001 | |
| 1002 | gdb::unique_xmalloc_ptr<lwpid_t[]> lwps (XCNEWVEC (lwpid_t, nlwps)); |
| 1003 | |
| 1004 | nlwps = ptrace (PT_GETLWPLIST, pid, (caddr_t) lwps.get (), nlwps); |
| 1005 | if (nlwps == -1) |
| 1006 | perror_with_name (("ptrace")); |
| 1007 | |
| 1008 | for (i = 0; i < nlwps; i++) |
| 1009 | { |
| 1010 | ptid_t ptid = ptid_t (pid, lwps[i], 0); |
| 1011 | |
| 1012 | if (!in_thread_list (ptid)) |
| 1013 | { |
| 1014 | #ifdef PT_LWP_EVENTS |
| 1015 | struct ptrace_lwpinfo pl; |
| 1016 | |
| 1017 | /* Don't add exited threads. Note that this is only called |
| 1018 | when attaching to a multi-threaded process. */ |
| 1019 | if (ptrace (PT_LWPINFO, lwps[i], (caddr_t) &pl, sizeof pl) == -1) |
| 1020 | perror_with_name (("ptrace")); |
| 1021 | if (pl.pl_flags & PL_FLAG_EXITED) |
| 1022 | continue; |
| 1023 | #endif |
| 1024 | if (debug_fbsd_lwp) |
| 1025 | fprintf_unfiltered (gdb_stdlog, |
| 1026 | "FLWP: adding thread for LWP %u\n", |
| 1027 | lwps[i]); |
| 1028 | add_thread (ptid); |
| 1029 | } |
| 1030 | } |
| 1031 | } |
| 1032 | |
| 1033 | /* Implement the "update_thread_list" target_ops method. */ |
| 1034 | |
| 1035 | void |
| 1036 | fbsd_nat_target::update_thread_list () |
| 1037 | { |
| 1038 | #ifdef PT_LWP_EVENTS |
| 1039 | /* With support for thread events, threads are added/deleted from the |
| 1040 | list as events are reported, so just try deleting exited threads. */ |
| 1041 | delete_exited_threads (); |
| 1042 | #else |
| 1043 | prune_threads (); |
| 1044 | |
| 1045 | fbsd_add_threads (inferior_ptid.pid ()); |
| 1046 | #endif |
| 1047 | } |
| 1048 | |
| 1049 | #ifdef TDP_RFPPWAIT |
| 1050 | /* |
| 1051 | To catch fork events, PT_FOLLOW_FORK is set on every traced process |
| 1052 | to enable stops on returns from fork or vfork. Note that both the |
| 1053 | parent and child will always stop, even if system call stops are not |
| 1054 | enabled. |
| 1055 | |
| 1056 | After a fork, both the child and parent process will stop and report |
| 1057 | an event. However, there is no guarantee of order. If the parent |
| 1058 | reports its stop first, then fbsd_wait explicitly waits for the new |
| 1059 | child before returning. If the child reports its stop first, then |
| 1060 | the event is saved on a list and ignored until the parent's stop is |
| 1061 | reported. fbsd_wait could have been changed to fetch the parent PID |
| 1062 | of the new child and used that to wait for the parent explicitly. |
| 1063 | However, if two threads in the parent fork at the same time, then |
| 1064 | the wait on the parent might return the "wrong" fork event. |
| 1065 | |
| 1066 | The initial version of PT_FOLLOW_FORK did not set PL_FLAG_CHILD for |
| 1067 | the new child process. This flag could be inferred by treating any |
| 1068 | events for an unknown pid as a new child. |
| 1069 | |
| 1070 | In addition, the initial version of PT_FOLLOW_FORK did not report a |
| 1071 | stop event for the parent process of a vfork until after the child |
| 1072 | process executed a new program or exited. The kernel was changed to |
| 1073 | defer the wait for exit or exec of the child until after posting the |
| 1074 | stop event shortly after the change to introduce PL_FLAG_CHILD. |
| 1075 | This could be worked around by reporting a vfork event when the |
| 1076 | child event posted and ignoring the subsequent event from the |
| 1077 | parent. |
| 1078 | |
| 1079 | This implementation requires both of these fixes for simplicity's |
| 1080 | sake. FreeBSD versions newer than 9.1 contain both fixes. |
| 1081 | */ |
| 1082 | |
| 1083 | static std::list<ptid_t> fbsd_pending_children; |
| 1084 | |
| 1085 | /* Record a new child process event that is reported before the |
| 1086 | corresponding fork event in the parent. */ |
| 1087 | |
| 1088 | static void |
| 1089 | fbsd_remember_child (ptid_t pid) |
| 1090 | { |
| 1091 | fbsd_pending_children.push_front (pid); |
| 1092 | } |
| 1093 | |
| 1094 | /* Check for a previously-recorded new child process event for PID. |
| 1095 | If one is found, remove it from the list and return the PTID. */ |
| 1096 | |
| 1097 | static ptid_t |
| 1098 | fbsd_is_child_pending (pid_t pid) |
| 1099 | { |
| 1100 | for (auto it = fbsd_pending_children.begin (); |
| 1101 | it != fbsd_pending_children.end (); it++) |
| 1102 | if (it->pid () == pid) |
| 1103 | { |
| 1104 | ptid_t ptid = *it; |
| 1105 | fbsd_pending_children.erase (it); |
| 1106 | return ptid; |
| 1107 | } |
| 1108 | return null_ptid; |
| 1109 | } |
| 1110 | |
| 1111 | #ifndef PTRACE_VFORK |
| 1112 | static std::forward_list<ptid_t> fbsd_pending_vfork_done; |
| 1113 | |
| 1114 | /* Record a pending vfork done event. */ |
| 1115 | |
| 1116 | static void |
| 1117 | fbsd_add_vfork_done (ptid_t pid) |
| 1118 | { |
| 1119 | fbsd_pending_vfork_done.push_front (pid); |
| 1120 | } |
| 1121 | |
| 1122 | /* Check for a pending vfork done event for a specific PID. */ |
| 1123 | |
| 1124 | static int |
| 1125 | fbsd_is_vfork_done_pending (pid_t pid) |
| 1126 | { |
| 1127 | for (auto it = fbsd_pending_vfork_done.begin (); |
| 1128 | it != fbsd_pending_vfork_done.end (); it++) |
| 1129 | if (it->pid () == pid) |
| 1130 | return 1; |
| 1131 | return 0; |
| 1132 | } |
| 1133 | |
| 1134 | /* Check for a pending vfork done event. If one is found, remove it |
| 1135 | from the list and return the PTID. */ |
| 1136 | |
| 1137 | static ptid_t |
| 1138 | fbsd_next_vfork_done (void) |
| 1139 | { |
| 1140 | if (!fbsd_pending_vfork_done.empty ()) |
| 1141 | { |
| 1142 | ptid_t ptid = fbsd_pending_vfork_done.front (); |
| 1143 | fbsd_pending_vfork_done.pop_front (); |
| 1144 | return ptid; |
| 1145 | } |
| 1146 | return null_ptid; |
| 1147 | } |
| 1148 | #endif |
| 1149 | #endif |
| 1150 | |
| 1151 | /* Implement the "resume" target_ops method. */ |
| 1152 | |
| 1153 | void |
| 1154 | fbsd_nat_target::resume (ptid_t ptid, int step, enum gdb_signal signo) |
| 1155 | { |
| 1156 | #if defined(TDP_RFPPWAIT) && !defined(PTRACE_VFORK) |
| 1157 | pid_t pid; |
| 1158 | |
| 1159 | /* Don't PT_CONTINUE a process which has a pending vfork done event. */ |
| 1160 | if (minus_one_ptid == ptid) |
| 1161 | pid = inferior_ptid.pid (); |
| 1162 | else |
| 1163 | pid = ptid.pid (); |
| 1164 | if (fbsd_is_vfork_done_pending (pid)) |
| 1165 | return; |
| 1166 | #endif |
| 1167 | |
| 1168 | if (debug_fbsd_lwp) |
| 1169 | fprintf_unfiltered (gdb_stdlog, |
| 1170 | "FLWP: fbsd_resume for ptid (%d, %ld, %ld)\n", |
| 1171 | ptid.pid (), ptid.lwp (), |
| 1172 | ptid.tid ()); |
| 1173 | if (ptid.lwp_p ()) |
| 1174 | { |
| 1175 | /* If ptid is a specific LWP, suspend all other LWPs in the process. */ |
| 1176 | inferior *inf = find_inferior_ptid (ptid); |
| 1177 | |
| 1178 | for (thread_info *tp : inf->non_exited_threads ()) |
| 1179 | { |
| 1180 | int request; |
| 1181 | |
| 1182 | if (tp->ptid.lwp () == ptid.lwp ()) |
| 1183 | request = PT_RESUME; |
| 1184 | else |
| 1185 | request = PT_SUSPEND; |
| 1186 | |
| 1187 | if (ptrace (request, tp->ptid.lwp (), NULL, 0) == -1) |
| 1188 | perror_with_name (("ptrace")); |
| 1189 | } |
| 1190 | } |
| 1191 | else |
| 1192 | { |
| 1193 | /* If ptid is a wildcard, resume all matching threads (they won't run |
| 1194 | until the process is continued however). */ |
| 1195 | for (thread_info *tp : all_non_exited_threads (ptid)) |
| 1196 | if (ptrace (PT_RESUME, tp->ptid.lwp (), NULL, 0) == -1) |
| 1197 | perror_with_name (("ptrace")); |
| 1198 | ptid = inferior_ptid; |
| 1199 | } |
| 1200 | |
| 1201 | #if __FreeBSD_version < 1200052 |
| 1202 | /* When multiple threads within a process wish to report STOPPED |
| 1203 | events from wait(), the kernel picks one thread event as the |
| 1204 | thread event to report. The chosen thread event is retrieved via |
| 1205 | PT_LWPINFO by passing the process ID as the request pid. If |
| 1206 | multiple events are pending, then the subsequent wait() after |
| 1207 | resuming a process will report another STOPPED event after |
| 1208 | resuming the process to handle the next thread event and so on. |
| 1209 | |
| 1210 | A single thread event is cleared as a side effect of resuming the |
| 1211 | process with PT_CONTINUE, PT_STEP, etc. In older kernels, |
| 1212 | however, the request pid was used to select which thread's event |
| 1213 | was cleared rather than always clearing the event that was just |
| 1214 | reported. To avoid clearing the event of the wrong LWP, always |
| 1215 | pass the process ID instead of an LWP ID to PT_CONTINUE or |
| 1216 | PT_SYSCALL. |
| 1217 | |
| 1218 | In the case of stepping, the process ID cannot be used with |
| 1219 | PT_STEP since it would step the thread that reported an event |
| 1220 | which may not be the thread indicated by PTID. For stepping, use |
| 1221 | PT_SETSTEP to enable stepping on the desired thread before |
| 1222 | resuming the process via PT_CONTINUE instead of using |
| 1223 | PT_STEP. */ |
| 1224 | if (step) |
| 1225 | { |
| 1226 | if (ptrace (PT_SETSTEP, get_ptrace_pid (ptid), NULL, 0) == -1) |
| 1227 | perror_with_name (("ptrace")); |
| 1228 | step = 0; |
| 1229 | } |
| 1230 | ptid = ptid_t (ptid.pid ()); |
| 1231 | #endif |
| 1232 | inf_ptrace_target::resume (ptid, step, signo); |
| 1233 | } |
| 1234 | |
| 1235 | #ifdef USE_SIGTRAP_SIGINFO |
| 1236 | /* Handle breakpoint and trace traps reported via SIGTRAP. If the |
| 1237 | trap was a breakpoint or trace trap that should be reported to the |
| 1238 | core, return true. */ |
| 1239 | |
| 1240 | static bool |
| 1241 | fbsd_handle_debug_trap (ptid_t ptid, const struct ptrace_lwpinfo &pl) |
| 1242 | { |
| 1243 | |
| 1244 | /* Ignore traps without valid siginfo or for signals other than |
| 1245 | SIGTRAP. |
| 1246 | |
| 1247 | FreeBSD kernels prior to r341800 can return stale siginfo for at |
| 1248 | least some events, but those events can be identified by |
| 1249 | additional flags set in pl_flags. True breakpoint and |
| 1250 | single-step traps should not have other flags set in |
| 1251 | pl_flags. */ |
| 1252 | if (pl.pl_flags != PL_FLAG_SI || pl.pl_siginfo.si_signo != SIGTRAP) |
| 1253 | return false; |
| 1254 | |
| 1255 | /* Trace traps are either a single step or a hardware watchpoint or |
| 1256 | breakpoint. */ |
| 1257 | if (pl.pl_siginfo.si_code == TRAP_TRACE) |
| 1258 | { |
| 1259 | if (debug_fbsd_nat) |
| 1260 | fprintf_unfiltered (gdb_stdlog, |
| 1261 | "FNAT: trace trap for LWP %ld\n", ptid.lwp ()); |
| 1262 | return true; |
| 1263 | } |
| 1264 | |
| 1265 | if (pl.pl_siginfo.si_code == TRAP_BRKPT) |
| 1266 | { |
| 1267 | /* Fixup PC for the software breakpoint. */ |
| 1268 | struct regcache *regcache = get_thread_regcache (ptid); |
| 1269 | struct gdbarch *gdbarch = regcache->arch (); |
| 1270 | int decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
| 1271 | |
| 1272 | if (debug_fbsd_nat) |
| 1273 | fprintf_unfiltered (gdb_stdlog, |
| 1274 | "FNAT: sw breakpoint trap for LWP %ld\n", |
| 1275 | ptid.lwp ()); |
| 1276 | if (decr_pc != 0) |
| 1277 | { |
| 1278 | CORE_ADDR pc; |
| 1279 | |
| 1280 | pc = regcache_read_pc (regcache); |
| 1281 | regcache_write_pc (regcache, pc - decr_pc); |
| 1282 | } |
| 1283 | return true; |
| 1284 | } |
| 1285 | |
| 1286 | return false; |
| 1287 | } |
| 1288 | #endif |
| 1289 | |
| 1290 | /* Wait for the child specified by PTID to do something. Return the |
| 1291 | process ID of the child, or MINUS_ONE_PTID in case of error; store |
| 1292 | the status in *OURSTATUS. */ |
| 1293 | |
| 1294 | ptid_t |
| 1295 | fbsd_nat_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus, |
| 1296 | int target_options) |
| 1297 | { |
| 1298 | ptid_t wptid; |
| 1299 | |
| 1300 | while (1) |
| 1301 | { |
| 1302 | #ifndef PTRACE_VFORK |
| 1303 | wptid = fbsd_next_vfork_done (); |
| 1304 | if (wptid != null_ptid) |
| 1305 | { |
| 1306 | ourstatus->kind = TARGET_WAITKIND_VFORK_DONE; |
| 1307 | return wptid; |
| 1308 | } |
| 1309 | #endif |
| 1310 | wptid = inf_ptrace_target::wait (ptid, ourstatus, target_options); |
| 1311 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED) |
| 1312 | { |
| 1313 | struct ptrace_lwpinfo pl; |
| 1314 | pid_t pid; |
| 1315 | int status; |
| 1316 | |
| 1317 | pid = wptid.pid (); |
| 1318 | if (ptrace (PT_LWPINFO, pid, (caddr_t) &pl, sizeof pl) == -1) |
| 1319 | perror_with_name (("ptrace")); |
| 1320 | |
| 1321 | wptid = ptid_t (pid, pl.pl_lwpid, 0); |
| 1322 | |
| 1323 | if (debug_fbsd_nat) |
| 1324 | { |
| 1325 | fprintf_unfiltered (gdb_stdlog, |
| 1326 | "FNAT: stop for LWP %u event %d flags %#x\n", |
| 1327 | pl.pl_lwpid, pl.pl_event, pl.pl_flags); |
| 1328 | if (pl.pl_flags & PL_FLAG_SI) |
| 1329 | fprintf_unfiltered (gdb_stdlog, |
| 1330 | "FNAT: si_signo %u si_code %u\n", |
| 1331 | pl.pl_siginfo.si_signo, |
| 1332 | pl.pl_siginfo.si_code); |
| 1333 | } |
| 1334 | |
| 1335 | #ifdef PT_LWP_EVENTS |
| 1336 | if (pl.pl_flags & PL_FLAG_EXITED) |
| 1337 | { |
| 1338 | /* If GDB attaches to a multi-threaded process, exiting |
| 1339 | threads might be skipped during post_attach that |
| 1340 | have not yet reported their PL_FLAG_EXITED event. |
| 1341 | Ignore EXITED events for an unknown LWP. */ |
| 1342 | thread_info *thr = find_thread_ptid (wptid); |
| 1343 | if (thr != nullptr) |
| 1344 | { |
| 1345 | if (debug_fbsd_lwp) |
| 1346 | fprintf_unfiltered (gdb_stdlog, |
| 1347 | "FLWP: deleting thread for LWP %u\n", |
| 1348 | pl.pl_lwpid); |
| 1349 | if (print_thread_events) |
| 1350 | printf_unfiltered (_("[%s exited]\n"), |
| 1351 | target_pid_to_str (wptid).c_str ()); |
| 1352 | delete_thread (thr); |
| 1353 | } |
| 1354 | if (ptrace (PT_CONTINUE, pid, (caddr_t) 1, 0) == -1) |
| 1355 | perror_with_name (("ptrace")); |
| 1356 | continue; |
| 1357 | } |
| 1358 | #endif |
| 1359 | |
| 1360 | /* Switch to an LWP PTID on the first stop in a new process. |
| 1361 | This is done after handling PL_FLAG_EXITED to avoid |
| 1362 | switching to an exited LWP. It is done before checking |
| 1363 | PL_FLAG_BORN in case the first stop reported after |
| 1364 | attaching to an existing process is a PL_FLAG_BORN |
| 1365 | event. */ |
| 1366 | if (in_thread_list (ptid_t (pid))) |
| 1367 | { |
| 1368 | if (debug_fbsd_lwp) |
| 1369 | fprintf_unfiltered (gdb_stdlog, |
| 1370 | "FLWP: using LWP %u for first thread\n", |
| 1371 | pl.pl_lwpid); |
| 1372 | thread_change_ptid (ptid_t (pid), wptid); |
| 1373 | } |
| 1374 | |
| 1375 | #ifdef PT_LWP_EVENTS |
| 1376 | if (pl.pl_flags & PL_FLAG_BORN) |
| 1377 | { |
| 1378 | /* If GDB attaches to a multi-threaded process, newborn |
| 1379 | threads might be added by fbsd_add_threads that have |
| 1380 | not yet reported their PL_FLAG_BORN event. Ignore |
| 1381 | BORN events for an already-known LWP. */ |
| 1382 | if (!in_thread_list (wptid)) |
| 1383 | { |
| 1384 | if (debug_fbsd_lwp) |
| 1385 | fprintf_unfiltered (gdb_stdlog, |
| 1386 | "FLWP: adding thread for LWP %u\n", |
| 1387 | pl.pl_lwpid); |
| 1388 | add_thread (wptid); |
| 1389 | } |
| 1390 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; |
| 1391 | return wptid; |
| 1392 | } |
| 1393 | #endif |
| 1394 | |
| 1395 | #ifdef TDP_RFPPWAIT |
| 1396 | if (pl.pl_flags & PL_FLAG_FORKED) |
| 1397 | { |
| 1398 | #ifndef PTRACE_VFORK |
| 1399 | struct kinfo_proc kp; |
| 1400 | #endif |
| 1401 | ptid_t child_ptid; |
| 1402 | pid_t child; |
| 1403 | |
| 1404 | child = pl.pl_child_pid; |
| 1405 | ourstatus->kind = TARGET_WAITKIND_FORKED; |
| 1406 | #ifdef PTRACE_VFORK |
| 1407 | if (pl.pl_flags & PL_FLAG_VFORKED) |
| 1408 | ourstatus->kind = TARGET_WAITKIND_VFORKED; |
| 1409 | #endif |
| 1410 | |
| 1411 | /* Make sure the other end of the fork is stopped too. */ |
| 1412 | child_ptid = fbsd_is_child_pending (child); |
| 1413 | if (child_ptid == null_ptid) |
| 1414 | { |
| 1415 | pid = waitpid (child, &status, 0); |
| 1416 | if (pid == -1) |
| 1417 | perror_with_name (("waitpid")); |
| 1418 | |
| 1419 | gdb_assert (pid == child); |
| 1420 | |
| 1421 | if (ptrace (PT_LWPINFO, child, (caddr_t)&pl, sizeof pl) == -1) |
| 1422 | perror_with_name (("ptrace")); |
| 1423 | |
| 1424 | gdb_assert (pl.pl_flags & PL_FLAG_CHILD); |
| 1425 | child_ptid = ptid_t (child, pl.pl_lwpid, 0); |
| 1426 | } |
| 1427 | |
| 1428 | /* Enable additional events on the child process. */ |
| 1429 | fbsd_enable_proc_events (child_ptid.pid ()); |
| 1430 | |
| 1431 | #ifndef PTRACE_VFORK |
| 1432 | /* For vfork, the child process will have the P_PPWAIT |
| 1433 | flag set. */ |
| 1434 | if (fbsd_fetch_kinfo_proc (child, &kp)) |
| 1435 | { |
| 1436 | if (kp.ki_flag & P_PPWAIT) |
| 1437 | ourstatus->kind = TARGET_WAITKIND_VFORKED; |
| 1438 | } |
| 1439 | else |
| 1440 | warning (_("Failed to fetch process information")); |
| 1441 | #endif |
| 1442 | ourstatus->value.related_pid = child_ptid; |
| 1443 | |
| 1444 | return wptid; |
| 1445 | } |
| 1446 | |
| 1447 | if (pl.pl_flags & PL_FLAG_CHILD) |
| 1448 | { |
| 1449 | /* Remember that this child forked, but do not report it |
| 1450 | until the parent reports its corresponding fork |
| 1451 | event. */ |
| 1452 | fbsd_remember_child (wptid); |
| 1453 | continue; |
| 1454 | } |
| 1455 | |
| 1456 | #ifdef PTRACE_VFORK |
| 1457 | if (pl.pl_flags & PL_FLAG_VFORK_DONE) |
| 1458 | { |
| 1459 | ourstatus->kind = TARGET_WAITKIND_VFORK_DONE; |
| 1460 | return wptid; |
| 1461 | } |
| 1462 | #endif |
| 1463 | #endif |
| 1464 | |
| 1465 | #ifdef PL_FLAG_EXEC |
| 1466 | if (pl.pl_flags & PL_FLAG_EXEC) |
| 1467 | { |
| 1468 | ourstatus->kind = TARGET_WAITKIND_EXECD; |
| 1469 | ourstatus->value.execd_pathname |
| 1470 | = xstrdup (pid_to_exec_file (pid)); |
| 1471 | return wptid; |
| 1472 | } |
| 1473 | #endif |
| 1474 | |
| 1475 | #ifdef USE_SIGTRAP_SIGINFO |
| 1476 | if (fbsd_handle_debug_trap (wptid, pl)) |
| 1477 | return wptid; |
| 1478 | #endif |
| 1479 | |
| 1480 | /* Note that PL_FLAG_SCE is set for any event reported while |
| 1481 | a thread is executing a system call in the kernel. In |
| 1482 | particular, signals that interrupt a sleep in a system |
| 1483 | call will report this flag as part of their event. Stops |
| 1484 | explicitly for system call entry and exit always use |
| 1485 | SIGTRAP, so only treat SIGTRAP events as system call |
| 1486 | entry/exit events. */ |
| 1487 | if (pl.pl_flags & (PL_FLAG_SCE | PL_FLAG_SCX) |
| 1488 | && ourstatus->value.sig == SIGTRAP) |
| 1489 | { |
| 1490 | #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE |
| 1491 | if (catch_syscall_enabled ()) |
| 1492 | { |
| 1493 | if (catching_syscall_number (pl.pl_syscall_code)) |
| 1494 | { |
| 1495 | if (pl.pl_flags & PL_FLAG_SCE) |
| 1496 | ourstatus->kind = TARGET_WAITKIND_SYSCALL_ENTRY; |
| 1497 | else |
| 1498 | ourstatus->kind = TARGET_WAITKIND_SYSCALL_RETURN; |
| 1499 | ourstatus->value.syscall_number = pl.pl_syscall_code; |
| 1500 | return wptid; |
| 1501 | } |
| 1502 | } |
| 1503 | #endif |
| 1504 | /* If the core isn't interested in this event, just |
| 1505 | continue the process explicitly and wait for another |
| 1506 | event. Note that PT_SYSCALL is "sticky" on FreeBSD |
| 1507 | and once system call stops are enabled on a process |
| 1508 | it stops for all system call entries and exits. */ |
| 1509 | if (ptrace (PT_CONTINUE, pid, (caddr_t) 1, 0) == -1) |
| 1510 | perror_with_name (("ptrace")); |
| 1511 | continue; |
| 1512 | } |
| 1513 | } |
| 1514 | return wptid; |
| 1515 | } |
| 1516 | } |
| 1517 | |
| 1518 | #ifdef USE_SIGTRAP_SIGINFO |
| 1519 | /* Implement the "stopped_by_sw_breakpoint" target_ops method. */ |
| 1520 | |
| 1521 | bool |
| 1522 | fbsd_nat_target::stopped_by_sw_breakpoint () |
| 1523 | { |
| 1524 | struct ptrace_lwpinfo pl; |
| 1525 | |
| 1526 | if (ptrace (PT_LWPINFO, get_ptrace_pid (inferior_ptid), (caddr_t) &pl, |
| 1527 | sizeof pl) == -1) |
| 1528 | return false; |
| 1529 | |
| 1530 | return (pl.pl_flags == PL_FLAG_SI |
| 1531 | && pl.pl_siginfo.si_signo == SIGTRAP |
| 1532 | && pl.pl_siginfo.si_code == TRAP_BRKPT); |
| 1533 | } |
| 1534 | |
| 1535 | /* Implement the "supports_stopped_by_sw_breakpoint" target_ops |
| 1536 | method. */ |
| 1537 | |
| 1538 | bool |
| 1539 | fbsd_nat_target::supports_stopped_by_sw_breakpoint () |
| 1540 | { |
| 1541 | return true; |
| 1542 | } |
| 1543 | #endif |
| 1544 | |
| 1545 | #ifdef TDP_RFPPWAIT |
| 1546 | /* Target hook for follow_fork. On entry and at return inferior_ptid is |
| 1547 | the ptid of the followed inferior. */ |
| 1548 | |
| 1549 | int |
| 1550 | fbsd_nat_target::follow_fork (int follow_child, int detach_fork) |
| 1551 | { |
| 1552 | if (!follow_child && detach_fork) |
| 1553 | { |
| 1554 | struct thread_info *tp = inferior_thread (); |
| 1555 | pid_t child_pid = tp->pending_follow.value.related_pid.pid (); |
| 1556 | |
| 1557 | /* Breakpoints have already been detached from the child by |
| 1558 | infrun.c. */ |
| 1559 | |
| 1560 | if (ptrace (PT_DETACH, child_pid, (PTRACE_TYPE_ARG3)1, 0) == -1) |
| 1561 | perror_with_name (("ptrace")); |
| 1562 | |
| 1563 | #ifndef PTRACE_VFORK |
| 1564 | if (tp->pending_follow.kind == TARGET_WAITKIND_VFORKED) |
| 1565 | { |
| 1566 | /* We can't insert breakpoints until the child process has |
| 1567 | finished with the shared memory region. The parent |
| 1568 | process doesn't wait for the child process to exit or |
| 1569 | exec until after it has been resumed from the ptrace stop |
| 1570 | to report the fork. Once it has been resumed it doesn't |
| 1571 | stop again before returning to userland, so there is no |
| 1572 | reliable way to wait on the parent. |
| 1573 | |
| 1574 | We can't stay attached to the child to wait for an exec |
| 1575 | or exit because it may invoke ptrace(PT_TRACE_ME) |
| 1576 | (e.g. if the parent process is a debugger forking a new |
| 1577 | child process). |
| 1578 | |
| 1579 | In the end, the best we can do is to make sure it runs |
| 1580 | for a little while. Hopefully it will be out of range of |
| 1581 | any breakpoints we reinsert. Usually this is only the |
| 1582 | single-step breakpoint at vfork's return point. */ |
| 1583 | |
| 1584 | usleep (10000); |
| 1585 | |
| 1586 | /* Schedule a fake VFORK_DONE event to report on the next |
| 1587 | wait. */ |
| 1588 | fbsd_add_vfork_done (inferior_ptid); |
| 1589 | } |
| 1590 | #endif |
| 1591 | } |
| 1592 | |
| 1593 | return 0; |
| 1594 | } |
| 1595 | |
| 1596 | int |
| 1597 | fbsd_nat_target::insert_fork_catchpoint (int pid) |
| 1598 | { |
| 1599 | return 0; |
| 1600 | } |
| 1601 | |
| 1602 | int |
| 1603 | fbsd_nat_target::remove_fork_catchpoint (int pid) |
| 1604 | { |
| 1605 | return 0; |
| 1606 | } |
| 1607 | |
| 1608 | int |
| 1609 | fbsd_nat_target::insert_vfork_catchpoint (int pid) |
| 1610 | { |
| 1611 | return 0; |
| 1612 | } |
| 1613 | |
| 1614 | int |
| 1615 | fbsd_nat_target::remove_vfork_catchpoint (int pid) |
| 1616 | { |
| 1617 | return 0; |
| 1618 | } |
| 1619 | #endif |
| 1620 | |
| 1621 | /* Implement the "post_startup_inferior" target_ops method. */ |
| 1622 | |
| 1623 | void |
| 1624 | fbsd_nat_target::post_startup_inferior (ptid_t pid) |
| 1625 | { |
| 1626 | fbsd_enable_proc_events (pid.pid ()); |
| 1627 | } |
| 1628 | |
| 1629 | /* Implement the "post_attach" target_ops method. */ |
| 1630 | |
| 1631 | void |
| 1632 | fbsd_nat_target::post_attach (int pid) |
| 1633 | { |
| 1634 | fbsd_enable_proc_events (pid); |
| 1635 | fbsd_add_threads (pid); |
| 1636 | } |
| 1637 | |
| 1638 | #ifdef PL_FLAG_EXEC |
| 1639 | /* If the FreeBSD kernel supports PL_FLAG_EXEC, then traced processes |
| 1640 | will always stop after exec. */ |
| 1641 | |
| 1642 | int |
| 1643 | fbsd_nat_target::insert_exec_catchpoint (int pid) |
| 1644 | { |
| 1645 | return 0; |
| 1646 | } |
| 1647 | |
| 1648 | int |
| 1649 | fbsd_nat_target::remove_exec_catchpoint (int pid) |
| 1650 | { |
| 1651 | return 0; |
| 1652 | } |
| 1653 | #endif |
| 1654 | |
| 1655 | #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE |
| 1656 | int |
| 1657 | fbsd_nat_target::set_syscall_catchpoint (int pid, bool needed, |
| 1658 | int any_count, |
| 1659 | gdb::array_view<const int> syscall_counts) |
| 1660 | { |
| 1661 | |
| 1662 | /* Ignore the arguments. inf-ptrace.c will use PT_SYSCALL which |
| 1663 | will catch all system call entries and exits. The system calls |
| 1664 | are filtered by GDB rather than the kernel. */ |
| 1665 | return 0; |
| 1666 | } |
| 1667 | #endif |
| 1668 | #endif |
| 1669 | |
| 1670 | void |
| 1671 | _initialize_fbsd_nat (void) |
| 1672 | { |
| 1673 | #ifdef PT_LWPINFO |
| 1674 | add_setshow_boolean_cmd ("fbsd-lwp", class_maintenance, |
| 1675 | &debug_fbsd_lwp, _("\ |
| 1676 | Set debugging of FreeBSD lwp module."), _("\ |
| 1677 | Show debugging of FreeBSD lwp module."), _("\ |
| 1678 | Enables printf debugging output."), |
| 1679 | NULL, |
| 1680 | &show_fbsd_lwp_debug, |
| 1681 | &setdebuglist, &showdebuglist); |
| 1682 | add_setshow_boolean_cmd ("fbsd-nat", class_maintenance, |
| 1683 | &debug_fbsd_nat, _("\ |
| 1684 | Set debugging of FreeBSD native target."), _("\ |
| 1685 | Show debugging of FreeBSD native target."), _("\ |
| 1686 | Enables printf debugging output."), |
| 1687 | NULL, |
| 1688 | &show_fbsd_nat_debug, |
| 1689 | &setdebuglist, &showdebuglist); |
| 1690 | #endif |
| 1691 | } |