| 1 | /* Target-dependent code for GNU/Linux, architecture independent. |
| 2 | |
| 3 | Copyright (C) 2009-2019 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 "gdbtypes.h" |
| 22 | #include "linux-tdep.h" |
| 23 | #include "auxv.h" |
| 24 | #include "target.h" |
| 25 | #include "gdbthread.h" |
| 26 | #include "gdbcore.h" |
| 27 | #include "regcache.h" |
| 28 | #include "regset.h" |
| 29 | #include "elf/common.h" |
| 30 | #include "elf-bfd.h" /* for elfcore_write_* */ |
| 31 | #include "inferior.h" |
| 32 | #include "cli/cli-utils.h" |
| 33 | #include "arch-utils.h" |
| 34 | #include "gdb_obstack.h" |
| 35 | #include "observable.h" |
| 36 | #include "objfiles.h" |
| 37 | #include "infcall.h" |
| 38 | #include "gdbcmd.h" |
| 39 | #include "gdb_regex.h" |
| 40 | #include "gdbsupport/enum-flags.h" |
| 41 | #include "gdbsupport/gdb_optional.h" |
| 42 | |
| 43 | #include <ctype.h> |
| 44 | |
| 45 | /* This enum represents the values that the user can choose when |
| 46 | informing the Linux kernel about which memory mappings will be |
| 47 | dumped in a corefile. They are described in the file |
| 48 | Documentation/filesystems/proc.txt, inside the Linux kernel |
| 49 | tree. */ |
| 50 | |
| 51 | enum filter_flag |
| 52 | { |
| 53 | COREFILTER_ANON_PRIVATE = 1 << 0, |
| 54 | COREFILTER_ANON_SHARED = 1 << 1, |
| 55 | COREFILTER_MAPPED_PRIVATE = 1 << 2, |
| 56 | COREFILTER_MAPPED_SHARED = 1 << 3, |
| 57 | COREFILTER_ELF_HEADERS = 1 << 4, |
| 58 | COREFILTER_HUGETLB_PRIVATE = 1 << 5, |
| 59 | COREFILTER_HUGETLB_SHARED = 1 << 6, |
| 60 | }; |
| 61 | DEF_ENUM_FLAGS_TYPE (enum filter_flag, filter_flags); |
| 62 | |
| 63 | /* This struct is used to map flags found in the "VmFlags:" field (in |
| 64 | the /proc/<PID>/smaps file). */ |
| 65 | |
| 66 | struct smaps_vmflags |
| 67 | { |
| 68 | /* Zero if this structure has not been initialized yet. It |
| 69 | probably means that the Linux kernel being used does not emit |
| 70 | the "VmFlags:" field on "/proc/PID/smaps". */ |
| 71 | |
| 72 | unsigned int initialized_p : 1; |
| 73 | |
| 74 | /* Memory mapped I/O area (VM_IO, "io"). */ |
| 75 | |
| 76 | unsigned int io_page : 1; |
| 77 | |
| 78 | /* Area uses huge TLB pages (VM_HUGETLB, "ht"). */ |
| 79 | |
| 80 | unsigned int uses_huge_tlb : 1; |
| 81 | |
| 82 | /* Do not include this memory region on the coredump (VM_DONTDUMP, "dd"). */ |
| 83 | |
| 84 | unsigned int exclude_coredump : 1; |
| 85 | |
| 86 | /* Is this a MAP_SHARED mapping (VM_SHARED, "sh"). */ |
| 87 | |
| 88 | unsigned int shared_mapping : 1; |
| 89 | }; |
| 90 | |
| 91 | /* Whether to take the /proc/PID/coredump_filter into account when |
| 92 | generating a corefile. */ |
| 93 | |
| 94 | static bool use_coredump_filter = true; |
| 95 | |
| 96 | /* Whether the value of smaps_vmflags->exclude_coredump should be |
| 97 | ignored, including mappings marked with the VM_DONTDUMP flag in |
| 98 | the dump. */ |
| 99 | static bool dump_excluded_mappings = false; |
| 100 | |
| 101 | /* This enum represents the signals' numbers on a generic architecture |
| 102 | running the Linux kernel. The definition of "generic" comes from |
| 103 | the file <include/uapi/asm-generic/signal.h>, from the Linux kernel |
| 104 | tree, which is the "de facto" implementation of signal numbers to |
| 105 | be used by new architecture ports. |
| 106 | |
| 107 | For those architectures which have differences between the generic |
| 108 | standard (e.g., Alpha), we define the different signals (and *only* |
| 109 | those) in the specific target-dependent file (e.g., |
| 110 | alpha-linux-tdep.c, for Alpha). Please refer to the architecture's |
| 111 | tdep file for more information. |
| 112 | |
| 113 | ARM deserves a special mention here. On the file |
| 114 | <arch/arm/include/uapi/asm/signal.h>, it defines only one different |
| 115 | (and ARM-only) signal, which is SIGSWI, with the same number as |
| 116 | SIGRTMIN. This signal is used only for a very specific target, |
| 117 | called ArthurOS (from RISCOS). Therefore, we do not handle it on |
| 118 | the ARM-tdep file, and we can safely use the generic signal handler |
| 119 | here for ARM targets. |
| 120 | |
| 121 | As stated above, this enum is derived from |
| 122 | <include/uapi/asm-generic/signal.h>, from the Linux kernel |
| 123 | tree. */ |
| 124 | |
| 125 | enum |
| 126 | { |
| 127 | LINUX_SIGHUP = 1, |
| 128 | LINUX_SIGINT = 2, |
| 129 | LINUX_SIGQUIT = 3, |
| 130 | LINUX_SIGILL = 4, |
| 131 | LINUX_SIGTRAP = 5, |
| 132 | LINUX_SIGABRT = 6, |
| 133 | LINUX_SIGIOT = 6, |
| 134 | LINUX_SIGBUS = 7, |
| 135 | LINUX_SIGFPE = 8, |
| 136 | LINUX_SIGKILL = 9, |
| 137 | LINUX_SIGUSR1 = 10, |
| 138 | LINUX_SIGSEGV = 11, |
| 139 | LINUX_SIGUSR2 = 12, |
| 140 | LINUX_SIGPIPE = 13, |
| 141 | LINUX_SIGALRM = 14, |
| 142 | LINUX_SIGTERM = 15, |
| 143 | LINUX_SIGSTKFLT = 16, |
| 144 | LINUX_SIGCHLD = 17, |
| 145 | LINUX_SIGCONT = 18, |
| 146 | LINUX_SIGSTOP = 19, |
| 147 | LINUX_SIGTSTP = 20, |
| 148 | LINUX_SIGTTIN = 21, |
| 149 | LINUX_SIGTTOU = 22, |
| 150 | LINUX_SIGURG = 23, |
| 151 | LINUX_SIGXCPU = 24, |
| 152 | LINUX_SIGXFSZ = 25, |
| 153 | LINUX_SIGVTALRM = 26, |
| 154 | LINUX_SIGPROF = 27, |
| 155 | LINUX_SIGWINCH = 28, |
| 156 | LINUX_SIGIO = 29, |
| 157 | LINUX_SIGPOLL = LINUX_SIGIO, |
| 158 | LINUX_SIGPWR = 30, |
| 159 | LINUX_SIGSYS = 31, |
| 160 | LINUX_SIGUNUSED = 31, |
| 161 | |
| 162 | LINUX_SIGRTMIN = 32, |
| 163 | LINUX_SIGRTMAX = 64, |
| 164 | }; |
| 165 | |
| 166 | static struct gdbarch_data *linux_gdbarch_data_handle; |
| 167 | |
| 168 | struct linux_gdbarch_data |
| 169 | { |
| 170 | struct type *siginfo_type; |
| 171 | }; |
| 172 | |
| 173 | static void * |
| 174 | init_linux_gdbarch_data (struct gdbarch *gdbarch) |
| 175 | { |
| 176 | return GDBARCH_OBSTACK_ZALLOC (gdbarch, struct linux_gdbarch_data); |
| 177 | } |
| 178 | |
| 179 | static struct linux_gdbarch_data * |
| 180 | get_linux_gdbarch_data (struct gdbarch *gdbarch) |
| 181 | { |
| 182 | return ((struct linux_gdbarch_data *) |
| 183 | gdbarch_data (gdbarch, linux_gdbarch_data_handle)); |
| 184 | } |
| 185 | |
| 186 | /* Linux-specific cached data. This is used by GDB for caching |
| 187 | purposes for each inferior. This helps reduce the overhead of |
| 188 | transfering data from a remote target to the local host. */ |
| 189 | struct linux_info |
| 190 | { |
| 191 | /* Cache of the inferior's vsyscall/vDSO mapping range. Only valid |
| 192 | if VSYSCALL_RANGE_P is positive. This is cached because getting |
| 193 | at this info requires an auxv lookup (which is itself cached), |
| 194 | and looking through the inferior's mappings (which change |
| 195 | throughout execution and therefore cannot be cached). */ |
| 196 | struct mem_range vsyscall_range {}; |
| 197 | |
| 198 | /* Zero if we haven't tried looking up the vsyscall's range before |
| 199 | yet. Positive if we tried looking it up, and found it. Negative |
| 200 | if we tried looking it up but failed. */ |
| 201 | int vsyscall_range_p = 0; |
| 202 | }; |
| 203 | |
| 204 | /* Per-inferior data key. */ |
| 205 | static const struct inferior_key<linux_info> linux_inferior_data; |
| 206 | |
| 207 | /* Frees whatever allocated space there is to be freed and sets INF's |
| 208 | linux cache data pointer to NULL. */ |
| 209 | |
| 210 | static void |
| 211 | invalidate_linux_cache_inf (struct inferior *inf) |
| 212 | { |
| 213 | linux_inferior_data.clear (inf); |
| 214 | } |
| 215 | |
| 216 | /* Fetch the linux cache info for INF. This function always returns a |
| 217 | valid INFO pointer. */ |
| 218 | |
| 219 | static struct linux_info * |
| 220 | get_linux_inferior_data (void) |
| 221 | { |
| 222 | struct linux_info *info; |
| 223 | struct inferior *inf = current_inferior (); |
| 224 | |
| 225 | info = linux_inferior_data.get (inf); |
| 226 | if (info == NULL) |
| 227 | info = linux_inferior_data.emplace (inf); |
| 228 | |
| 229 | return info; |
| 230 | } |
| 231 | |
| 232 | /* See linux-tdep.h. */ |
| 233 | |
| 234 | struct type * |
| 235 | linux_get_siginfo_type_with_fields (struct gdbarch *gdbarch, |
| 236 | linux_siginfo_extra_fields extra_fields) |
| 237 | { |
| 238 | struct linux_gdbarch_data *linux_gdbarch_data; |
| 239 | struct type *int_type, *uint_type, *long_type, *void_ptr_type, *short_type; |
| 240 | struct type *uid_type, *pid_type; |
| 241 | struct type *sigval_type, *clock_type; |
| 242 | struct type *siginfo_type, *sifields_type; |
| 243 | struct type *type; |
| 244 | |
| 245 | linux_gdbarch_data = get_linux_gdbarch_data (gdbarch); |
| 246 | if (linux_gdbarch_data->siginfo_type != NULL) |
| 247 | return linux_gdbarch_data->siginfo_type; |
| 248 | |
| 249 | int_type = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), |
| 250 | 0, "int"); |
| 251 | uint_type = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), |
| 252 | 1, "unsigned int"); |
| 253 | long_type = arch_integer_type (gdbarch, gdbarch_long_bit (gdbarch), |
| 254 | 0, "long"); |
| 255 | short_type = arch_integer_type (gdbarch, gdbarch_long_bit (gdbarch), |
| 256 | 0, "short"); |
| 257 | void_ptr_type = lookup_pointer_type (builtin_type (gdbarch)->builtin_void); |
| 258 | |
| 259 | /* sival_t */ |
| 260 | sigval_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION); |
| 261 | TYPE_NAME (sigval_type) = xstrdup ("sigval_t"); |
| 262 | append_composite_type_field (sigval_type, "sival_int", int_type); |
| 263 | append_composite_type_field (sigval_type, "sival_ptr", void_ptr_type); |
| 264 | |
| 265 | /* __pid_t */ |
| 266 | pid_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF, |
| 267 | TYPE_LENGTH (int_type) * TARGET_CHAR_BIT, "__pid_t"); |
| 268 | TYPE_TARGET_TYPE (pid_type) = int_type; |
| 269 | TYPE_TARGET_STUB (pid_type) = 1; |
| 270 | |
| 271 | /* __uid_t */ |
| 272 | uid_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF, |
| 273 | TYPE_LENGTH (uint_type) * TARGET_CHAR_BIT, "__uid_t"); |
| 274 | TYPE_TARGET_TYPE (uid_type) = uint_type; |
| 275 | TYPE_TARGET_STUB (uid_type) = 1; |
| 276 | |
| 277 | /* __clock_t */ |
| 278 | clock_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF, |
| 279 | TYPE_LENGTH (long_type) * TARGET_CHAR_BIT, |
| 280 | "__clock_t"); |
| 281 | TYPE_TARGET_TYPE (clock_type) = long_type; |
| 282 | TYPE_TARGET_STUB (clock_type) = 1; |
| 283 | |
| 284 | /* _sifields */ |
| 285 | sifields_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION); |
| 286 | |
| 287 | { |
| 288 | const int si_max_size = 128; |
| 289 | int si_pad_size; |
| 290 | int size_of_int = gdbarch_int_bit (gdbarch) / HOST_CHAR_BIT; |
| 291 | |
| 292 | /* _pad */ |
| 293 | if (gdbarch_ptr_bit (gdbarch) == 64) |
| 294 | si_pad_size = (si_max_size / size_of_int) - 4; |
| 295 | else |
| 296 | si_pad_size = (si_max_size / size_of_int) - 3; |
| 297 | append_composite_type_field (sifields_type, "_pad", |
| 298 | init_vector_type (int_type, si_pad_size)); |
| 299 | } |
| 300 | |
| 301 | /* _kill */ |
| 302 | type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
| 303 | append_composite_type_field (type, "si_pid", pid_type); |
| 304 | append_composite_type_field (type, "si_uid", uid_type); |
| 305 | append_composite_type_field (sifields_type, "_kill", type); |
| 306 | |
| 307 | /* _timer */ |
| 308 | type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
| 309 | append_composite_type_field (type, "si_tid", int_type); |
| 310 | append_composite_type_field (type, "si_overrun", int_type); |
| 311 | append_composite_type_field (type, "si_sigval", sigval_type); |
| 312 | append_composite_type_field (sifields_type, "_timer", type); |
| 313 | |
| 314 | /* _rt */ |
| 315 | type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
| 316 | append_composite_type_field (type, "si_pid", pid_type); |
| 317 | append_composite_type_field (type, "si_uid", uid_type); |
| 318 | append_composite_type_field (type, "si_sigval", sigval_type); |
| 319 | append_composite_type_field (sifields_type, "_rt", type); |
| 320 | |
| 321 | /* _sigchld */ |
| 322 | type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
| 323 | append_composite_type_field (type, "si_pid", pid_type); |
| 324 | append_composite_type_field (type, "si_uid", uid_type); |
| 325 | append_composite_type_field (type, "si_status", int_type); |
| 326 | append_composite_type_field (type, "si_utime", clock_type); |
| 327 | append_composite_type_field (type, "si_stime", clock_type); |
| 328 | append_composite_type_field (sifields_type, "_sigchld", type); |
| 329 | |
| 330 | /* _sigfault */ |
| 331 | type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
| 332 | append_composite_type_field (type, "si_addr", void_ptr_type); |
| 333 | |
| 334 | /* Additional bound fields for _sigfault in case they were requested. */ |
| 335 | if ((extra_fields & LINUX_SIGINFO_FIELD_ADDR_BND) != 0) |
| 336 | { |
| 337 | struct type *sigfault_bnd_fields; |
| 338 | |
| 339 | append_composite_type_field (type, "_addr_lsb", short_type); |
| 340 | sigfault_bnd_fields = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
| 341 | append_composite_type_field (sigfault_bnd_fields, "_lower", void_ptr_type); |
| 342 | append_composite_type_field (sigfault_bnd_fields, "_upper", void_ptr_type); |
| 343 | append_composite_type_field (type, "_addr_bnd", sigfault_bnd_fields); |
| 344 | } |
| 345 | append_composite_type_field (sifields_type, "_sigfault", type); |
| 346 | |
| 347 | /* _sigpoll */ |
| 348 | type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
| 349 | append_composite_type_field (type, "si_band", long_type); |
| 350 | append_composite_type_field (type, "si_fd", int_type); |
| 351 | append_composite_type_field (sifields_type, "_sigpoll", type); |
| 352 | |
| 353 | /* struct siginfo */ |
| 354 | siginfo_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
| 355 | TYPE_NAME (siginfo_type) = xstrdup ("siginfo"); |
| 356 | append_composite_type_field (siginfo_type, "si_signo", int_type); |
| 357 | append_composite_type_field (siginfo_type, "si_errno", int_type); |
| 358 | append_composite_type_field (siginfo_type, "si_code", int_type); |
| 359 | append_composite_type_field_aligned (siginfo_type, |
| 360 | "_sifields", sifields_type, |
| 361 | TYPE_LENGTH (long_type)); |
| 362 | |
| 363 | linux_gdbarch_data->siginfo_type = siginfo_type; |
| 364 | |
| 365 | return siginfo_type; |
| 366 | } |
| 367 | |
| 368 | /* This function is suitable for architectures that don't |
| 369 | extend/override the standard siginfo structure. */ |
| 370 | |
| 371 | static struct type * |
| 372 | linux_get_siginfo_type (struct gdbarch *gdbarch) |
| 373 | { |
| 374 | return linux_get_siginfo_type_with_fields (gdbarch, 0); |
| 375 | } |
| 376 | |
| 377 | /* Return true if the target is running on uClinux instead of normal |
| 378 | Linux kernel. */ |
| 379 | |
| 380 | int |
| 381 | linux_is_uclinux (void) |
| 382 | { |
| 383 | CORE_ADDR dummy; |
| 384 | |
| 385 | return (target_auxv_search (current_top_target (), AT_NULL, &dummy) > 0 |
| 386 | && target_auxv_search (current_top_target (), AT_PAGESZ, &dummy) == 0); |
| 387 | } |
| 388 | |
| 389 | static int |
| 390 | linux_has_shared_address_space (struct gdbarch *gdbarch) |
| 391 | { |
| 392 | return linux_is_uclinux (); |
| 393 | } |
| 394 | |
| 395 | /* This is how we want PTIDs from core files to be printed. */ |
| 396 | |
| 397 | static std::string |
| 398 | linux_core_pid_to_str (struct gdbarch *gdbarch, ptid_t ptid) |
| 399 | { |
| 400 | if (ptid.lwp () != 0) |
| 401 | return string_printf ("LWP %ld", ptid.lwp ()); |
| 402 | |
| 403 | return normal_pid_to_str (ptid); |
| 404 | } |
| 405 | |
| 406 | /* Service function for corefiles and info proc. */ |
| 407 | |
| 408 | static void |
| 409 | read_mapping (const char *line, |
| 410 | ULONGEST *addr, ULONGEST *endaddr, |
| 411 | const char **permissions, size_t *permissions_len, |
| 412 | ULONGEST *offset, |
| 413 | const char **device, size_t *device_len, |
| 414 | ULONGEST *inode, |
| 415 | const char **filename) |
| 416 | { |
| 417 | const char *p = line; |
| 418 | |
| 419 | *addr = strtoulst (p, &p, 16); |
| 420 | if (*p == '-') |
| 421 | p++; |
| 422 | *endaddr = strtoulst (p, &p, 16); |
| 423 | |
| 424 | p = skip_spaces (p); |
| 425 | *permissions = p; |
| 426 | while (*p && !isspace (*p)) |
| 427 | p++; |
| 428 | *permissions_len = p - *permissions; |
| 429 | |
| 430 | *offset = strtoulst (p, &p, 16); |
| 431 | |
| 432 | p = skip_spaces (p); |
| 433 | *device = p; |
| 434 | while (*p && !isspace (*p)) |
| 435 | p++; |
| 436 | *device_len = p - *device; |
| 437 | |
| 438 | *inode = strtoulst (p, &p, 10); |
| 439 | |
| 440 | p = skip_spaces (p); |
| 441 | *filename = p; |
| 442 | } |
| 443 | |
| 444 | /* Helper function to decode the "VmFlags" field in /proc/PID/smaps. |
| 445 | |
| 446 | This function was based on the documentation found on |
| 447 | <Documentation/filesystems/proc.txt>, on the Linux kernel. |
| 448 | |
| 449 | Linux kernels before commit |
| 450 | 834f82e2aa9a8ede94b17b656329f850c1471514 (3.10) do not have this |
| 451 | field on smaps. */ |
| 452 | |
| 453 | static void |
| 454 | decode_vmflags (char *p, struct smaps_vmflags *v) |
| 455 | { |
| 456 | char *saveptr = NULL; |
| 457 | const char *s; |
| 458 | |
| 459 | v->initialized_p = 1; |
| 460 | p = skip_to_space (p); |
| 461 | p = skip_spaces (p); |
| 462 | |
| 463 | for (s = strtok_r (p, " ", &saveptr); |
| 464 | s != NULL; |
| 465 | s = strtok_r (NULL, " ", &saveptr)) |
| 466 | { |
| 467 | if (strcmp (s, "io") == 0) |
| 468 | v->io_page = 1; |
| 469 | else if (strcmp (s, "ht") == 0) |
| 470 | v->uses_huge_tlb = 1; |
| 471 | else if (strcmp (s, "dd") == 0) |
| 472 | v->exclude_coredump = 1; |
| 473 | else if (strcmp (s, "sh") == 0) |
| 474 | v->shared_mapping = 1; |
| 475 | } |
| 476 | } |
| 477 | |
| 478 | /* Regexes used by mapping_is_anonymous_p. Put in a structure because |
| 479 | they're initialized lazily. */ |
| 480 | |
| 481 | struct mapping_regexes |
| 482 | { |
| 483 | /* Matches "/dev/zero" filenames (with or without the "(deleted)" |
| 484 | string in the end). We know for sure, based on the Linux kernel |
| 485 | code, that memory mappings whose associated filename is |
| 486 | "/dev/zero" are guaranteed to be MAP_ANONYMOUS. */ |
| 487 | compiled_regex dev_zero |
| 488 | {"^/dev/zero\\( (deleted)\\)\\?$", REG_NOSUB, |
| 489 | _("Could not compile regex to match /dev/zero filename")}; |
| 490 | |
| 491 | /* Matches "/SYSV%08x" filenames (with or without the "(deleted)" |
| 492 | string in the end). These filenames refer to shared memory |
| 493 | (shmem), and memory mappings associated with them are |
| 494 | MAP_ANONYMOUS as well. */ |
| 495 | compiled_regex shmem_file |
| 496 | {"^/\\?SYSV[0-9a-fA-F]\\{8\\}\\( (deleted)\\)\\?$", REG_NOSUB, |
| 497 | _("Could not compile regex to match shmem filenames")}; |
| 498 | |
| 499 | /* A heuristic we use to try to mimic the Linux kernel's 'n_link == |
| 500 | 0' code, which is responsible to decide if it is dealing with a |
| 501 | 'MAP_SHARED | MAP_ANONYMOUS' mapping. In other words, if |
| 502 | FILE_DELETED matches, it does not necessarily mean that we are |
| 503 | dealing with an anonymous shared mapping. However, there is no |
| 504 | easy way to detect this currently, so this is the best |
| 505 | approximation we have. |
| 506 | |
| 507 | As a result, GDB will dump readonly pages of deleted executables |
| 508 | when using the default value of coredump_filter (0x33), while the |
| 509 | Linux kernel will not dump those pages. But we can live with |
| 510 | that. */ |
| 511 | compiled_regex file_deleted |
| 512 | {" (deleted)$", REG_NOSUB, |
| 513 | _("Could not compile regex to match '<file> (deleted)'")}; |
| 514 | }; |
| 515 | |
| 516 | /* Return 1 if the memory mapping is anonymous, 0 otherwise. |
| 517 | |
| 518 | FILENAME is the name of the file present in the first line of the |
| 519 | memory mapping, in the "/proc/PID/smaps" output. For example, if |
| 520 | the first line is: |
| 521 | |
| 522 | 7fd0ca877000-7fd0d0da0000 r--p 00000000 fd:02 2100770 /path/to/file |
| 523 | |
| 524 | Then FILENAME will be "/path/to/file". */ |
| 525 | |
| 526 | static int |
| 527 | mapping_is_anonymous_p (const char *filename) |
| 528 | { |
| 529 | static gdb::optional<mapping_regexes> regexes; |
| 530 | static int init_regex_p = 0; |
| 531 | |
| 532 | if (!init_regex_p) |
| 533 | { |
| 534 | /* Let's be pessimistic and assume there will be an error while |
| 535 | compiling the regex'es. */ |
| 536 | init_regex_p = -1; |
| 537 | |
| 538 | regexes.emplace (); |
| 539 | |
| 540 | /* If we reached this point, then everything succeeded. */ |
| 541 | init_regex_p = 1; |
| 542 | } |
| 543 | |
| 544 | if (init_regex_p == -1) |
| 545 | { |
| 546 | const char deleted[] = " (deleted)"; |
| 547 | size_t del_len = sizeof (deleted) - 1; |
| 548 | size_t filename_len = strlen (filename); |
| 549 | |
| 550 | /* There was an error while compiling the regex'es above. In |
| 551 | order to try to give some reliable information to the caller, |
| 552 | we just try to find the string " (deleted)" in the filename. |
| 553 | If we managed to find it, then we assume the mapping is |
| 554 | anonymous. */ |
| 555 | return (filename_len >= del_len |
| 556 | && strcmp (filename + filename_len - del_len, deleted) == 0); |
| 557 | } |
| 558 | |
| 559 | if (*filename == '\0' |
| 560 | || regexes->dev_zero.exec (filename, 0, NULL, 0) == 0 |
| 561 | || regexes->shmem_file.exec (filename, 0, NULL, 0) == 0 |
| 562 | || regexes->file_deleted.exec (filename, 0, NULL, 0) == 0) |
| 563 | return 1; |
| 564 | |
| 565 | return 0; |
| 566 | } |
| 567 | |
| 568 | /* Return 0 if the memory mapping (which is related to FILTERFLAGS, V, |
| 569 | MAYBE_PRIVATE_P, MAPPING_ANONYMOUS_P, ADDR and OFFSET) should not |
| 570 | be dumped, or greater than 0 if it should. |
| 571 | |
| 572 | In a nutshell, this is the logic that we follow in order to decide |
| 573 | if a mapping should be dumped or not. |
| 574 | |
| 575 | - If the mapping is associated to a file whose name ends with |
| 576 | " (deleted)", or if the file is "/dev/zero", or if it is |
| 577 | "/SYSV%08x" (shared memory), or if there is no file associated |
| 578 | with it, or if the AnonHugePages: or the Anonymous: fields in the |
| 579 | /proc/PID/smaps have contents, then GDB considers this mapping to |
| 580 | be anonymous. Otherwise, GDB considers this mapping to be a |
| 581 | file-backed mapping (because there will be a file associated with |
| 582 | it). |
| 583 | |
| 584 | It is worth mentioning that, from all those checks described |
| 585 | above, the most fragile is the one to see if the file name ends |
| 586 | with " (deleted)". This does not necessarily mean that the |
| 587 | mapping is anonymous, because the deleted file associated with |
| 588 | the mapping may have been a hard link to another file, for |
| 589 | example. The Linux kernel checks to see if "i_nlink == 0", but |
| 590 | GDB cannot easily (and normally) do this check (iff running as |
| 591 | root, it could find the mapping in /proc/PID/map_files/ and |
| 592 | determine whether there still are other hard links to the |
| 593 | inode/file). Therefore, we made a compromise here, and we assume |
| 594 | that if the file name ends with " (deleted)", then the mapping is |
| 595 | indeed anonymous. FWIW, this is something the Linux kernel could |
| 596 | do better: expose this information in a more direct way. |
| 597 | |
| 598 | - If we see the flag "sh" in the "VmFlags:" field (in |
| 599 | /proc/PID/smaps), then certainly the memory mapping is shared |
| 600 | (VM_SHARED). If we have access to the VmFlags, and we don't see |
| 601 | the "sh" there, then certainly the mapping is private. However, |
| 602 | Linux kernels before commit |
| 603 | 834f82e2aa9a8ede94b17b656329f850c1471514 (3.10) do not have the |
| 604 | "VmFlags:" field; in that case, we use another heuristic: if we |
| 605 | see 'p' in the permission flags, then we assume that the mapping |
| 606 | is private, even though the presence of the 's' flag there would |
| 607 | mean VM_MAYSHARE, which means the mapping could still be private. |
| 608 | This should work OK enough, however. |
| 609 | |
| 610 | - Even if, at the end, we decided that we should not dump the |
| 611 | mapping, we still have to check if it is something like an ELF |
| 612 | header (of a DSO or an executable, for example). If it is, and |
| 613 | if the user is interested in dump it, then we should dump it. */ |
| 614 | |
| 615 | static int |
| 616 | dump_mapping_p (filter_flags filterflags, const struct smaps_vmflags *v, |
| 617 | int maybe_private_p, int mapping_anon_p, int mapping_file_p, |
| 618 | const char *filename, ULONGEST addr, ULONGEST offset) |
| 619 | { |
| 620 | /* Initially, we trust in what we received from our caller. This |
| 621 | value may not be very precise (i.e., it was probably gathered |
| 622 | from the permission line in the /proc/PID/smaps list, which |
| 623 | actually refers to VM_MAYSHARE, and not VM_SHARED), but it is |
| 624 | what we have until we take a look at the "VmFlags:" field |
| 625 | (assuming that the version of the Linux kernel being used |
| 626 | supports it, of course). */ |
| 627 | int private_p = maybe_private_p; |
| 628 | int dump_p; |
| 629 | |
| 630 | /* We always dump vDSO and vsyscall mappings, because it's likely that |
| 631 | there'll be no file to read the contents from at core load time. |
| 632 | The kernel does the same. */ |
| 633 | if (strcmp ("[vdso]", filename) == 0 |
| 634 | || strcmp ("[vsyscall]", filename) == 0) |
| 635 | return 1; |
| 636 | |
| 637 | if (v->initialized_p) |
| 638 | { |
| 639 | /* We never dump I/O mappings. */ |
| 640 | if (v->io_page) |
| 641 | return 0; |
| 642 | |
| 643 | /* Check if we should exclude this mapping. */ |
| 644 | if (!dump_excluded_mappings && v->exclude_coredump) |
| 645 | return 0; |
| 646 | |
| 647 | /* Update our notion of whether this mapping is shared or |
| 648 | private based on a trustworthy value. */ |
| 649 | private_p = !v->shared_mapping; |
| 650 | |
| 651 | /* HugeTLB checking. */ |
| 652 | if (v->uses_huge_tlb) |
| 653 | { |
| 654 | if ((private_p && (filterflags & COREFILTER_HUGETLB_PRIVATE)) |
| 655 | || (!private_p && (filterflags & COREFILTER_HUGETLB_SHARED))) |
| 656 | return 1; |
| 657 | |
| 658 | return 0; |
| 659 | } |
| 660 | } |
| 661 | |
| 662 | if (private_p) |
| 663 | { |
| 664 | if (mapping_anon_p && mapping_file_p) |
| 665 | { |
| 666 | /* This is a special situation. It can happen when we see a |
| 667 | mapping that is file-backed, but that contains anonymous |
| 668 | pages. */ |
| 669 | dump_p = ((filterflags & COREFILTER_ANON_PRIVATE) != 0 |
| 670 | || (filterflags & COREFILTER_MAPPED_PRIVATE) != 0); |
| 671 | } |
| 672 | else if (mapping_anon_p) |
| 673 | dump_p = (filterflags & COREFILTER_ANON_PRIVATE) != 0; |
| 674 | else |
| 675 | dump_p = (filterflags & COREFILTER_MAPPED_PRIVATE) != 0; |
| 676 | } |
| 677 | else |
| 678 | { |
| 679 | if (mapping_anon_p && mapping_file_p) |
| 680 | { |
| 681 | /* This is a special situation. It can happen when we see a |
| 682 | mapping that is file-backed, but that contains anonymous |
| 683 | pages. */ |
| 684 | dump_p = ((filterflags & COREFILTER_ANON_SHARED) != 0 |
| 685 | || (filterflags & COREFILTER_MAPPED_SHARED) != 0); |
| 686 | } |
| 687 | else if (mapping_anon_p) |
| 688 | dump_p = (filterflags & COREFILTER_ANON_SHARED) != 0; |
| 689 | else |
| 690 | dump_p = (filterflags & COREFILTER_MAPPED_SHARED) != 0; |
| 691 | } |
| 692 | |
| 693 | /* Even if we decided that we shouldn't dump this mapping, we still |
| 694 | have to check whether (a) the user wants us to dump mappings |
| 695 | containing an ELF header, and (b) the mapping in question |
| 696 | contains an ELF header. If (a) and (b) are true, then we should |
| 697 | dump this mapping. |
| 698 | |
| 699 | A mapping contains an ELF header if it is a private mapping, its |
| 700 | offset is zero, and its first word is ELFMAG. */ |
| 701 | if (!dump_p && private_p && offset == 0 |
| 702 | && (filterflags & COREFILTER_ELF_HEADERS) != 0) |
| 703 | { |
| 704 | /* Let's check if we have an ELF header. */ |
| 705 | gdb::unique_xmalloc_ptr<char> header; |
| 706 | int errcode; |
| 707 | |
| 708 | /* Useful define specifying the size of the ELF magical |
| 709 | header. */ |
| 710 | #ifndef SELFMAG |
| 711 | #define SELFMAG 4 |
| 712 | #endif |
| 713 | |
| 714 | /* Read the first SELFMAG bytes and check if it is ELFMAG. */ |
| 715 | if (target_read_string (addr, &header, SELFMAG, &errcode) == SELFMAG |
| 716 | && errcode == 0) |
| 717 | { |
| 718 | const char *h = header.get (); |
| 719 | |
| 720 | /* The EI_MAG* and ELFMAG* constants come from |
| 721 | <elf/common.h>. */ |
| 722 | if (h[EI_MAG0] == ELFMAG0 && h[EI_MAG1] == ELFMAG1 |
| 723 | && h[EI_MAG2] == ELFMAG2 && h[EI_MAG3] == ELFMAG3) |
| 724 | { |
| 725 | /* This mapping contains an ELF header, so we |
| 726 | should dump it. */ |
| 727 | dump_p = 1; |
| 728 | } |
| 729 | } |
| 730 | } |
| 731 | |
| 732 | return dump_p; |
| 733 | } |
| 734 | |
| 735 | /* Implement the "info proc" command. */ |
| 736 | |
| 737 | static void |
| 738 | linux_info_proc (struct gdbarch *gdbarch, const char *args, |
| 739 | enum info_proc_what what) |
| 740 | { |
| 741 | /* A long is used for pid instead of an int to avoid a loss of precision |
| 742 | compiler warning from the output of strtoul. */ |
| 743 | long pid; |
| 744 | int cmdline_f = (what == IP_MINIMAL || what == IP_CMDLINE || what == IP_ALL); |
| 745 | int cwd_f = (what == IP_MINIMAL || what == IP_CWD || what == IP_ALL); |
| 746 | int exe_f = (what == IP_MINIMAL || what == IP_EXE || what == IP_ALL); |
| 747 | int mappings_f = (what == IP_MAPPINGS || what == IP_ALL); |
| 748 | int status_f = (what == IP_STATUS || what == IP_ALL); |
| 749 | int stat_f = (what == IP_STAT || what == IP_ALL); |
| 750 | char filename[100]; |
| 751 | int target_errno; |
| 752 | |
| 753 | if (args && isdigit (args[0])) |
| 754 | { |
| 755 | char *tem; |
| 756 | |
| 757 | pid = strtoul (args, &tem, 10); |
| 758 | args = tem; |
| 759 | } |
| 760 | else |
| 761 | { |
| 762 | if (!target_has_execution) |
| 763 | error (_("No current process: you must name one.")); |
| 764 | if (current_inferior ()->fake_pid_p) |
| 765 | error (_("Can't determine the current process's PID: you must name one.")); |
| 766 | |
| 767 | pid = current_inferior ()->pid; |
| 768 | } |
| 769 | |
| 770 | args = skip_spaces (args); |
| 771 | if (args && args[0]) |
| 772 | error (_("Too many parameters: %s"), args); |
| 773 | |
| 774 | printf_filtered (_("process %ld\n"), pid); |
| 775 | if (cmdline_f) |
| 776 | { |
| 777 | xsnprintf (filename, sizeof filename, "/proc/%ld/cmdline", pid); |
| 778 | gdb_byte *buffer; |
| 779 | ssize_t len = target_fileio_read_alloc (NULL, filename, &buffer); |
| 780 | |
| 781 | if (len > 0) |
| 782 | { |
| 783 | gdb::unique_xmalloc_ptr<char> cmdline ((char *) buffer); |
| 784 | ssize_t pos; |
| 785 | |
| 786 | for (pos = 0; pos < len - 1; pos++) |
| 787 | { |
| 788 | if (buffer[pos] == '\0') |
| 789 | buffer[pos] = ' '; |
| 790 | } |
| 791 | buffer[len - 1] = '\0'; |
| 792 | printf_filtered ("cmdline = '%s'\n", buffer); |
| 793 | } |
| 794 | else |
| 795 | warning (_("unable to open /proc file '%s'"), filename); |
| 796 | } |
| 797 | if (cwd_f) |
| 798 | { |
| 799 | xsnprintf (filename, sizeof filename, "/proc/%ld/cwd", pid); |
| 800 | gdb::optional<std::string> contents |
| 801 | = target_fileio_readlink (NULL, filename, &target_errno); |
| 802 | if (contents.has_value ()) |
| 803 | printf_filtered ("cwd = '%s'\n", contents->c_str ()); |
| 804 | else |
| 805 | warning (_("unable to read link '%s'"), filename); |
| 806 | } |
| 807 | if (exe_f) |
| 808 | { |
| 809 | xsnprintf (filename, sizeof filename, "/proc/%ld/exe", pid); |
| 810 | gdb::optional<std::string> contents |
| 811 | = target_fileio_readlink (NULL, filename, &target_errno); |
| 812 | if (contents.has_value ()) |
| 813 | printf_filtered ("exe = '%s'\n", contents->c_str ()); |
| 814 | else |
| 815 | warning (_("unable to read link '%s'"), filename); |
| 816 | } |
| 817 | if (mappings_f) |
| 818 | { |
| 819 | xsnprintf (filename, sizeof filename, "/proc/%ld/maps", pid); |
| 820 | gdb::unique_xmalloc_ptr<char> map |
| 821 | = target_fileio_read_stralloc (NULL, filename); |
| 822 | if (map != NULL) |
| 823 | { |
| 824 | char *line; |
| 825 | |
| 826 | printf_filtered (_("Mapped address spaces:\n\n")); |
| 827 | if (gdbarch_addr_bit (gdbarch) == 32) |
| 828 | { |
| 829 | printf_filtered ("\t%10s %10s %10s %10s %s\n", |
| 830 | "Start Addr", |
| 831 | " End Addr", |
| 832 | " Size", " Offset", "objfile"); |
| 833 | } |
| 834 | else |
| 835 | { |
| 836 | printf_filtered (" %18s %18s %10s %10s %s\n", |
| 837 | "Start Addr", |
| 838 | " End Addr", |
| 839 | " Size", " Offset", "objfile"); |
| 840 | } |
| 841 | |
| 842 | for (line = strtok (map.get (), "\n"); |
| 843 | line; |
| 844 | line = strtok (NULL, "\n")) |
| 845 | { |
| 846 | ULONGEST addr, endaddr, offset, inode; |
| 847 | const char *permissions, *device, *mapping_filename; |
| 848 | size_t permissions_len, device_len; |
| 849 | |
| 850 | read_mapping (line, &addr, &endaddr, |
| 851 | &permissions, &permissions_len, |
| 852 | &offset, &device, &device_len, |
| 853 | &inode, &mapping_filename); |
| 854 | |
| 855 | if (gdbarch_addr_bit (gdbarch) == 32) |
| 856 | { |
| 857 | printf_filtered ("\t%10s %10s %10s %10s %s\n", |
| 858 | paddress (gdbarch, addr), |
| 859 | paddress (gdbarch, endaddr), |
| 860 | hex_string (endaddr - addr), |
| 861 | hex_string (offset), |
| 862 | *mapping_filename ? mapping_filename : ""); |
| 863 | } |
| 864 | else |
| 865 | { |
| 866 | printf_filtered (" %18s %18s %10s %10s %s\n", |
| 867 | paddress (gdbarch, addr), |
| 868 | paddress (gdbarch, endaddr), |
| 869 | hex_string (endaddr - addr), |
| 870 | hex_string (offset), |
| 871 | *mapping_filename ? mapping_filename : ""); |
| 872 | } |
| 873 | } |
| 874 | } |
| 875 | else |
| 876 | warning (_("unable to open /proc file '%s'"), filename); |
| 877 | } |
| 878 | if (status_f) |
| 879 | { |
| 880 | xsnprintf (filename, sizeof filename, "/proc/%ld/status", pid); |
| 881 | gdb::unique_xmalloc_ptr<char> status |
| 882 | = target_fileio_read_stralloc (NULL, filename); |
| 883 | if (status) |
| 884 | puts_filtered (status.get ()); |
| 885 | else |
| 886 | warning (_("unable to open /proc file '%s'"), filename); |
| 887 | } |
| 888 | if (stat_f) |
| 889 | { |
| 890 | xsnprintf (filename, sizeof filename, "/proc/%ld/stat", pid); |
| 891 | gdb::unique_xmalloc_ptr<char> statstr |
| 892 | = target_fileio_read_stralloc (NULL, filename); |
| 893 | if (statstr) |
| 894 | { |
| 895 | const char *p = statstr.get (); |
| 896 | |
| 897 | printf_filtered (_("Process: %s\n"), |
| 898 | pulongest (strtoulst (p, &p, 10))); |
| 899 | |
| 900 | p = skip_spaces (p); |
| 901 | if (*p == '(') |
| 902 | { |
| 903 | /* ps command also relies on no trailing fields |
| 904 | ever contain ')'. */ |
| 905 | const char *ep = strrchr (p, ')'); |
| 906 | if (ep != NULL) |
| 907 | { |
| 908 | printf_filtered ("Exec file: %.*s\n", |
| 909 | (int) (ep - p - 1), p + 1); |
| 910 | p = ep + 1; |
| 911 | } |
| 912 | } |
| 913 | |
| 914 | p = skip_spaces (p); |
| 915 | if (*p) |
| 916 | printf_filtered (_("State: %c\n"), *p++); |
| 917 | |
| 918 | if (*p) |
| 919 | printf_filtered (_("Parent process: %s\n"), |
| 920 | pulongest (strtoulst (p, &p, 10))); |
| 921 | if (*p) |
| 922 | printf_filtered (_("Process group: %s\n"), |
| 923 | pulongest (strtoulst (p, &p, 10))); |
| 924 | if (*p) |
| 925 | printf_filtered (_("Session id: %s\n"), |
| 926 | pulongest (strtoulst (p, &p, 10))); |
| 927 | if (*p) |
| 928 | printf_filtered (_("TTY: %s\n"), |
| 929 | pulongest (strtoulst (p, &p, 10))); |
| 930 | if (*p) |
| 931 | printf_filtered (_("TTY owner process group: %s\n"), |
| 932 | pulongest (strtoulst (p, &p, 10))); |
| 933 | |
| 934 | if (*p) |
| 935 | printf_filtered (_("Flags: %s\n"), |
| 936 | hex_string (strtoulst (p, &p, 10))); |
| 937 | if (*p) |
| 938 | printf_filtered (_("Minor faults (no memory page): %s\n"), |
| 939 | pulongest (strtoulst (p, &p, 10))); |
| 940 | if (*p) |
| 941 | printf_filtered (_("Minor faults, children: %s\n"), |
| 942 | pulongest (strtoulst (p, &p, 10))); |
| 943 | if (*p) |
| 944 | printf_filtered (_("Major faults (memory page faults): %s\n"), |
| 945 | pulongest (strtoulst (p, &p, 10))); |
| 946 | if (*p) |
| 947 | printf_filtered (_("Major faults, children: %s\n"), |
| 948 | pulongest (strtoulst (p, &p, 10))); |
| 949 | if (*p) |
| 950 | printf_filtered (_("utime: %s\n"), |
| 951 | pulongest (strtoulst (p, &p, 10))); |
| 952 | if (*p) |
| 953 | printf_filtered (_("stime: %s\n"), |
| 954 | pulongest (strtoulst (p, &p, 10))); |
| 955 | if (*p) |
| 956 | printf_filtered (_("utime, children: %s\n"), |
| 957 | pulongest (strtoulst (p, &p, 10))); |
| 958 | if (*p) |
| 959 | printf_filtered (_("stime, children: %s\n"), |
| 960 | pulongest (strtoulst (p, &p, 10))); |
| 961 | if (*p) |
| 962 | printf_filtered (_("jiffies remaining in current " |
| 963 | "time slice: %s\n"), |
| 964 | pulongest (strtoulst (p, &p, 10))); |
| 965 | if (*p) |
| 966 | printf_filtered (_("'nice' value: %s\n"), |
| 967 | pulongest (strtoulst (p, &p, 10))); |
| 968 | if (*p) |
| 969 | printf_filtered (_("jiffies until next timeout: %s\n"), |
| 970 | pulongest (strtoulst (p, &p, 10))); |
| 971 | if (*p) |
| 972 | printf_filtered (_("jiffies until next SIGALRM: %s\n"), |
| 973 | pulongest (strtoulst (p, &p, 10))); |
| 974 | if (*p) |
| 975 | printf_filtered (_("start time (jiffies since " |
| 976 | "system boot): %s\n"), |
| 977 | pulongest (strtoulst (p, &p, 10))); |
| 978 | if (*p) |
| 979 | printf_filtered (_("Virtual memory size: %s\n"), |
| 980 | pulongest (strtoulst (p, &p, 10))); |
| 981 | if (*p) |
| 982 | printf_filtered (_("Resident set size: %s\n"), |
| 983 | pulongest (strtoulst (p, &p, 10))); |
| 984 | if (*p) |
| 985 | printf_filtered (_("rlim: %s\n"), |
| 986 | pulongest (strtoulst (p, &p, 10))); |
| 987 | if (*p) |
| 988 | printf_filtered (_("Start of text: %s\n"), |
| 989 | hex_string (strtoulst (p, &p, 10))); |
| 990 | if (*p) |
| 991 | printf_filtered (_("End of text: %s\n"), |
| 992 | hex_string (strtoulst (p, &p, 10))); |
| 993 | if (*p) |
| 994 | printf_filtered (_("Start of stack: %s\n"), |
| 995 | hex_string (strtoulst (p, &p, 10))); |
| 996 | #if 0 /* Don't know how architecture-dependent the rest is... |
| 997 | Anyway the signal bitmap info is available from "status". */ |
| 998 | if (*p) |
| 999 | printf_filtered (_("Kernel stack pointer: %s\n"), |
| 1000 | hex_string (strtoulst (p, &p, 10))); |
| 1001 | if (*p) |
| 1002 | printf_filtered (_("Kernel instr pointer: %s\n"), |
| 1003 | hex_string (strtoulst (p, &p, 10))); |
| 1004 | if (*p) |
| 1005 | printf_filtered (_("Pending signals bitmap: %s\n"), |
| 1006 | hex_string (strtoulst (p, &p, 10))); |
| 1007 | if (*p) |
| 1008 | printf_filtered (_("Blocked signals bitmap: %s\n"), |
| 1009 | hex_string (strtoulst (p, &p, 10))); |
| 1010 | if (*p) |
| 1011 | printf_filtered (_("Ignored signals bitmap: %s\n"), |
| 1012 | hex_string (strtoulst (p, &p, 10))); |
| 1013 | if (*p) |
| 1014 | printf_filtered (_("Catched signals bitmap: %s\n"), |
| 1015 | hex_string (strtoulst (p, &p, 10))); |
| 1016 | if (*p) |
| 1017 | printf_filtered (_("wchan (system call): %s\n"), |
| 1018 | hex_string (strtoulst (p, &p, 10))); |
| 1019 | #endif |
| 1020 | } |
| 1021 | else |
| 1022 | warning (_("unable to open /proc file '%s'"), filename); |
| 1023 | } |
| 1024 | } |
| 1025 | |
| 1026 | /* Implement "info proc mappings" for a corefile. */ |
| 1027 | |
| 1028 | static void |
| 1029 | linux_core_info_proc_mappings (struct gdbarch *gdbarch, const char *args) |
| 1030 | { |
| 1031 | asection *section; |
| 1032 | ULONGEST count, page_size; |
| 1033 | unsigned char *descdata, *filenames, *descend; |
| 1034 | size_t note_size; |
| 1035 | unsigned int addr_size_bits, addr_size; |
| 1036 | struct gdbarch *core_gdbarch = gdbarch_from_bfd (core_bfd); |
| 1037 | /* We assume this for reading 64-bit core files. */ |
| 1038 | gdb_static_assert (sizeof (ULONGEST) >= 8); |
| 1039 | |
| 1040 | section = bfd_get_section_by_name (core_bfd, ".note.linuxcore.file"); |
| 1041 | if (section == NULL) |
| 1042 | { |
| 1043 | warning (_("unable to find mappings in core file")); |
| 1044 | return; |
| 1045 | } |
| 1046 | |
| 1047 | addr_size_bits = gdbarch_addr_bit (core_gdbarch); |
| 1048 | addr_size = addr_size_bits / 8; |
| 1049 | note_size = bfd_section_size (section); |
| 1050 | |
| 1051 | if (note_size < 2 * addr_size) |
| 1052 | error (_("malformed core note - too short for header")); |
| 1053 | |
| 1054 | gdb::def_vector<unsigned char> contents (note_size); |
| 1055 | if (!bfd_get_section_contents (core_bfd, section, contents.data (), |
| 1056 | 0, note_size)) |
| 1057 | error (_("could not get core note contents")); |
| 1058 | |
| 1059 | descdata = contents.data (); |
| 1060 | descend = descdata + note_size; |
| 1061 | |
| 1062 | if (descdata[note_size - 1] != '\0') |
| 1063 | error (_("malformed note - does not end with \\0")); |
| 1064 | |
| 1065 | count = bfd_get (addr_size_bits, core_bfd, descdata); |
| 1066 | descdata += addr_size; |
| 1067 | |
| 1068 | page_size = bfd_get (addr_size_bits, core_bfd, descdata); |
| 1069 | descdata += addr_size; |
| 1070 | |
| 1071 | if (note_size < 2 * addr_size + count * 3 * addr_size) |
| 1072 | error (_("malformed note - too short for supplied file count")); |
| 1073 | |
| 1074 | printf_filtered (_("Mapped address spaces:\n\n")); |
| 1075 | if (gdbarch_addr_bit (gdbarch) == 32) |
| 1076 | { |
| 1077 | printf_filtered ("\t%10s %10s %10s %10s %s\n", |
| 1078 | "Start Addr", |
| 1079 | " End Addr", |
| 1080 | " Size", " Offset", "objfile"); |
| 1081 | } |
| 1082 | else |
| 1083 | { |
| 1084 | printf_filtered (" %18s %18s %10s %10s %s\n", |
| 1085 | "Start Addr", |
| 1086 | " End Addr", |
| 1087 | " Size", " Offset", "objfile"); |
| 1088 | } |
| 1089 | |
| 1090 | filenames = descdata + count * 3 * addr_size; |
| 1091 | while (--count > 0) |
| 1092 | { |
| 1093 | ULONGEST start, end, file_ofs; |
| 1094 | |
| 1095 | if (filenames == descend) |
| 1096 | error (_("malformed note - filenames end too early")); |
| 1097 | |
| 1098 | start = bfd_get (addr_size_bits, core_bfd, descdata); |
| 1099 | descdata += addr_size; |
| 1100 | end = bfd_get (addr_size_bits, core_bfd, descdata); |
| 1101 | descdata += addr_size; |
| 1102 | file_ofs = bfd_get (addr_size_bits, core_bfd, descdata); |
| 1103 | descdata += addr_size; |
| 1104 | |
| 1105 | file_ofs *= page_size; |
| 1106 | |
| 1107 | if (gdbarch_addr_bit (gdbarch) == 32) |
| 1108 | printf_filtered ("\t%10s %10s %10s %10s %s\n", |
| 1109 | paddress (gdbarch, start), |
| 1110 | paddress (gdbarch, end), |
| 1111 | hex_string (end - start), |
| 1112 | hex_string (file_ofs), |
| 1113 | filenames); |
| 1114 | else |
| 1115 | printf_filtered (" %18s %18s %10s %10s %s\n", |
| 1116 | paddress (gdbarch, start), |
| 1117 | paddress (gdbarch, end), |
| 1118 | hex_string (end - start), |
| 1119 | hex_string (file_ofs), |
| 1120 | filenames); |
| 1121 | |
| 1122 | filenames += 1 + strlen ((char *) filenames); |
| 1123 | } |
| 1124 | } |
| 1125 | |
| 1126 | /* Implement "info proc" for a corefile. */ |
| 1127 | |
| 1128 | static void |
| 1129 | linux_core_info_proc (struct gdbarch *gdbarch, const char *args, |
| 1130 | enum info_proc_what what) |
| 1131 | { |
| 1132 | int exe_f = (what == IP_MINIMAL || what == IP_EXE || what == IP_ALL); |
| 1133 | int mappings_f = (what == IP_MAPPINGS || what == IP_ALL); |
| 1134 | |
| 1135 | if (exe_f) |
| 1136 | { |
| 1137 | const char *exe; |
| 1138 | |
| 1139 | exe = bfd_core_file_failing_command (core_bfd); |
| 1140 | if (exe != NULL) |
| 1141 | printf_filtered ("exe = '%s'\n", exe); |
| 1142 | else |
| 1143 | warning (_("unable to find command name in core file")); |
| 1144 | } |
| 1145 | |
| 1146 | if (mappings_f) |
| 1147 | linux_core_info_proc_mappings (gdbarch, args); |
| 1148 | |
| 1149 | if (!exe_f && !mappings_f) |
| 1150 | error (_("unable to handle request")); |
| 1151 | } |
| 1152 | |
| 1153 | /* Read siginfo data from the core, if possible. Returns -1 on |
| 1154 | failure. Otherwise, returns the number of bytes read. READBUF, |
| 1155 | OFFSET, and LEN are all as specified by the to_xfer_partial |
| 1156 | interface. */ |
| 1157 | |
| 1158 | static LONGEST |
| 1159 | linux_core_xfer_siginfo (struct gdbarch *gdbarch, gdb_byte *readbuf, |
| 1160 | ULONGEST offset, ULONGEST len) |
| 1161 | { |
| 1162 | thread_section_name section_name (".note.linuxcore.siginfo", inferior_ptid); |
| 1163 | asection *section = bfd_get_section_by_name (core_bfd, section_name.c_str ()); |
| 1164 | if (section == NULL) |
| 1165 | return -1; |
| 1166 | |
| 1167 | if (!bfd_get_section_contents (core_bfd, section, readbuf, offset, len)) |
| 1168 | return -1; |
| 1169 | |
| 1170 | return len; |
| 1171 | } |
| 1172 | |
| 1173 | typedef int linux_find_memory_region_ftype (ULONGEST vaddr, ULONGEST size, |
| 1174 | ULONGEST offset, ULONGEST inode, |
| 1175 | int read, int write, |
| 1176 | int exec, int modified, |
| 1177 | const char *filename, |
| 1178 | void *data); |
| 1179 | |
| 1180 | /* List memory regions in the inferior for a corefile. */ |
| 1181 | |
| 1182 | static int |
| 1183 | linux_find_memory_regions_full (struct gdbarch *gdbarch, |
| 1184 | linux_find_memory_region_ftype *func, |
| 1185 | void *obfd) |
| 1186 | { |
| 1187 | char mapsfilename[100]; |
| 1188 | char coredumpfilter_name[100]; |
| 1189 | pid_t pid; |
| 1190 | /* Default dump behavior of coredump_filter (0x33), according to |
| 1191 | Documentation/filesystems/proc.txt from the Linux kernel |
| 1192 | tree. */ |
| 1193 | filter_flags filterflags = (COREFILTER_ANON_PRIVATE |
| 1194 | | COREFILTER_ANON_SHARED |
| 1195 | | COREFILTER_ELF_HEADERS |
| 1196 | | COREFILTER_HUGETLB_PRIVATE); |
| 1197 | |
| 1198 | /* We need to know the real target PID to access /proc. */ |
| 1199 | if (current_inferior ()->fake_pid_p) |
| 1200 | return 1; |
| 1201 | |
| 1202 | pid = current_inferior ()->pid; |
| 1203 | |
| 1204 | if (use_coredump_filter) |
| 1205 | { |
| 1206 | xsnprintf (coredumpfilter_name, sizeof (coredumpfilter_name), |
| 1207 | "/proc/%d/coredump_filter", pid); |
| 1208 | gdb::unique_xmalloc_ptr<char> coredumpfilterdata |
| 1209 | = target_fileio_read_stralloc (NULL, coredumpfilter_name); |
| 1210 | if (coredumpfilterdata != NULL) |
| 1211 | { |
| 1212 | unsigned int flags; |
| 1213 | |
| 1214 | sscanf (coredumpfilterdata.get (), "%x", &flags); |
| 1215 | filterflags = (enum filter_flag) flags; |
| 1216 | } |
| 1217 | } |
| 1218 | |
| 1219 | xsnprintf (mapsfilename, sizeof mapsfilename, "/proc/%d/smaps", pid); |
| 1220 | gdb::unique_xmalloc_ptr<char> data |
| 1221 | = target_fileio_read_stralloc (NULL, mapsfilename); |
| 1222 | if (data == NULL) |
| 1223 | { |
| 1224 | /* Older Linux kernels did not support /proc/PID/smaps. */ |
| 1225 | xsnprintf (mapsfilename, sizeof mapsfilename, "/proc/%d/maps", pid); |
| 1226 | data = target_fileio_read_stralloc (NULL, mapsfilename); |
| 1227 | } |
| 1228 | |
| 1229 | if (data != NULL) |
| 1230 | { |
| 1231 | char *line, *t; |
| 1232 | |
| 1233 | line = strtok_r (data.get (), "\n", &t); |
| 1234 | while (line != NULL) |
| 1235 | { |
| 1236 | ULONGEST addr, endaddr, offset, inode; |
| 1237 | const char *permissions, *device, *filename; |
| 1238 | struct smaps_vmflags v; |
| 1239 | size_t permissions_len, device_len; |
| 1240 | int read, write, exec, priv; |
| 1241 | int has_anonymous = 0; |
| 1242 | int should_dump_p = 0; |
| 1243 | int mapping_anon_p; |
| 1244 | int mapping_file_p; |
| 1245 | |
| 1246 | memset (&v, 0, sizeof (v)); |
| 1247 | read_mapping (line, &addr, &endaddr, &permissions, &permissions_len, |
| 1248 | &offset, &device, &device_len, &inode, &filename); |
| 1249 | mapping_anon_p = mapping_is_anonymous_p (filename); |
| 1250 | /* If the mapping is not anonymous, then we can consider it |
| 1251 | to be file-backed. These two states (anonymous or |
| 1252 | file-backed) seem to be exclusive, but they can actually |
| 1253 | coexist. For example, if a file-backed mapping has |
| 1254 | "Anonymous:" pages (see more below), then the Linux |
| 1255 | kernel will dump this mapping when the user specified |
| 1256 | that she only wants anonymous mappings in the corefile |
| 1257 | (*even* when she explicitly disabled the dumping of |
| 1258 | file-backed mappings). */ |
| 1259 | mapping_file_p = !mapping_anon_p; |
| 1260 | |
| 1261 | /* Decode permissions. */ |
| 1262 | read = (memchr (permissions, 'r', permissions_len) != 0); |
| 1263 | write = (memchr (permissions, 'w', permissions_len) != 0); |
| 1264 | exec = (memchr (permissions, 'x', permissions_len) != 0); |
| 1265 | /* 'private' here actually means VM_MAYSHARE, and not |
| 1266 | VM_SHARED. In order to know if a mapping is really |
| 1267 | private or not, we must check the flag "sh" in the |
| 1268 | VmFlags field. This is done by decode_vmflags. However, |
| 1269 | if we are using a Linux kernel released before the commit |
| 1270 | 834f82e2aa9a8ede94b17b656329f850c1471514 (3.10), we will |
| 1271 | not have the VmFlags there. In this case, there is |
| 1272 | really no way to know if we are dealing with VM_SHARED, |
| 1273 | so we just assume that VM_MAYSHARE is enough. */ |
| 1274 | priv = memchr (permissions, 'p', permissions_len) != 0; |
| 1275 | |
| 1276 | /* Try to detect if region should be dumped by parsing smaps |
| 1277 | counters. */ |
| 1278 | for (line = strtok_r (NULL, "\n", &t); |
| 1279 | line != NULL && line[0] >= 'A' && line[0] <= 'Z'; |
| 1280 | line = strtok_r (NULL, "\n", &t)) |
| 1281 | { |
| 1282 | char keyword[64 + 1]; |
| 1283 | |
| 1284 | if (sscanf (line, "%64s", keyword) != 1) |
| 1285 | { |
| 1286 | warning (_("Error parsing {s,}maps file '%s'"), mapsfilename); |
| 1287 | break; |
| 1288 | } |
| 1289 | |
| 1290 | if (strcmp (keyword, "Anonymous:") == 0) |
| 1291 | { |
| 1292 | /* Older Linux kernels did not support the |
| 1293 | "Anonymous:" counter. Check it here. */ |
| 1294 | has_anonymous = 1; |
| 1295 | } |
| 1296 | else if (strcmp (keyword, "VmFlags:") == 0) |
| 1297 | decode_vmflags (line, &v); |
| 1298 | |
| 1299 | if (strcmp (keyword, "AnonHugePages:") == 0 |
| 1300 | || strcmp (keyword, "Anonymous:") == 0) |
| 1301 | { |
| 1302 | unsigned long number; |
| 1303 | |
| 1304 | if (sscanf (line, "%*s%lu", &number) != 1) |
| 1305 | { |
| 1306 | warning (_("Error parsing {s,}maps file '%s' number"), |
| 1307 | mapsfilename); |
| 1308 | break; |
| 1309 | } |
| 1310 | if (number > 0) |
| 1311 | { |
| 1312 | /* Even if we are dealing with a file-backed |
| 1313 | mapping, if it contains anonymous pages we |
| 1314 | consider it to be *also* an anonymous |
| 1315 | mapping, because this is what the Linux |
| 1316 | kernel does: |
| 1317 | |
| 1318 | // Dump segments that have been written to. |
| 1319 | if (vma->anon_vma && FILTER(ANON_PRIVATE)) |
| 1320 | goto whole; |
| 1321 | |
| 1322 | Note that if the mapping is already marked as |
| 1323 | file-backed (i.e., mapping_file_p is |
| 1324 | non-zero), then this is a special case, and |
| 1325 | this mapping will be dumped either when the |
| 1326 | user wants to dump file-backed *or* anonymous |
| 1327 | mappings. */ |
| 1328 | mapping_anon_p = 1; |
| 1329 | } |
| 1330 | } |
| 1331 | } |
| 1332 | |
| 1333 | if (has_anonymous) |
| 1334 | should_dump_p = dump_mapping_p (filterflags, &v, priv, |
| 1335 | mapping_anon_p, mapping_file_p, |
| 1336 | filename, addr, offset); |
| 1337 | else |
| 1338 | { |
| 1339 | /* Older Linux kernels did not support the "Anonymous:" counter. |
| 1340 | If it is missing, we can't be sure - dump all the pages. */ |
| 1341 | should_dump_p = 1; |
| 1342 | } |
| 1343 | |
| 1344 | /* Invoke the callback function to create the corefile segment. */ |
| 1345 | if (should_dump_p) |
| 1346 | func (addr, endaddr - addr, offset, inode, |
| 1347 | read, write, exec, 1, /* MODIFIED is true because we |
| 1348 | want to dump the mapping. */ |
| 1349 | filename, obfd); |
| 1350 | } |
| 1351 | |
| 1352 | return 0; |
| 1353 | } |
| 1354 | |
| 1355 | return 1; |
| 1356 | } |
| 1357 | |
| 1358 | /* A structure for passing information through |
| 1359 | linux_find_memory_regions_full. */ |
| 1360 | |
| 1361 | struct linux_find_memory_regions_data |
| 1362 | { |
| 1363 | /* The original callback. */ |
| 1364 | |
| 1365 | find_memory_region_ftype func; |
| 1366 | |
| 1367 | /* The original datum. */ |
| 1368 | |
| 1369 | void *obfd; |
| 1370 | }; |
| 1371 | |
| 1372 | /* A callback for linux_find_memory_regions that converts between the |
| 1373 | "full"-style callback and find_memory_region_ftype. */ |
| 1374 | |
| 1375 | static int |
| 1376 | linux_find_memory_regions_thunk (ULONGEST vaddr, ULONGEST size, |
| 1377 | ULONGEST offset, ULONGEST inode, |
| 1378 | int read, int write, int exec, int modified, |
| 1379 | const char *filename, void *arg) |
| 1380 | { |
| 1381 | struct linux_find_memory_regions_data *data |
| 1382 | = (struct linux_find_memory_regions_data *) arg; |
| 1383 | |
| 1384 | return data->func (vaddr, size, read, write, exec, modified, data->obfd); |
| 1385 | } |
| 1386 | |
| 1387 | /* A variant of linux_find_memory_regions_full that is suitable as the |
| 1388 | gdbarch find_memory_regions method. */ |
| 1389 | |
| 1390 | static int |
| 1391 | linux_find_memory_regions (struct gdbarch *gdbarch, |
| 1392 | find_memory_region_ftype func, void *obfd) |
| 1393 | { |
| 1394 | struct linux_find_memory_regions_data data; |
| 1395 | |
| 1396 | data.func = func; |
| 1397 | data.obfd = obfd; |
| 1398 | |
| 1399 | return linux_find_memory_regions_full (gdbarch, |
| 1400 | linux_find_memory_regions_thunk, |
| 1401 | &data); |
| 1402 | } |
| 1403 | |
| 1404 | /* Determine which signal stopped execution. */ |
| 1405 | |
| 1406 | static int |
| 1407 | find_signalled_thread (struct thread_info *info, void *data) |
| 1408 | { |
| 1409 | if (info->suspend.stop_signal != GDB_SIGNAL_0 |
| 1410 | && info->ptid.pid () == inferior_ptid.pid ()) |
| 1411 | return 1; |
| 1412 | |
| 1413 | return 0; |
| 1414 | } |
| 1415 | |
| 1416 | /* This is used to pass information from |
| 1417 | linux_make_mappings_corefile_notes through |
| 1418 | linux_find_memory_regions_full. */ |
| 1419 | |
| 1420 | struct linux_make_mappings_data |
| 1421 | { |
| 1422 | /* Number of files mapped. */ |
| 1423 | ULONGEST file_count; |
| 1424 | |
| 1425 | /* The obstack for the main part of the data. */ |
| 1426 | struct obstack *data_obstack; |
| 1427 | |
| 1428 | /* The filename obstack. */ |
| 1429 | struct obstack *filename_obstack; |
| 1430 | |
| 1431 | /* The architecture's "long" type. */ |
| 1432 | struct type *long_type; |
| 1433 | }; |
| 1434 | |
| 1435 | static linux_find_memory_region_ftype linux_make_mappings_callback; |
| 1436 | |
| 1437 | /* A callback for linux_find_memory_regions_full that updates the |
| 1438 | mappings data for linux_make_mappings_corefile_notes. */ |
| 1439 | |
| 1440 | static int |
| 1441 | linux_make_mappings_callback (ULONGEST vaddr, ULONGEST size, |
| 1442 | ULONGEST offset, ULONGEST inode, |
| 1443 | int read, int write, int exec, int modified, |
| 1444 | const char *filename, void *data) |
| 1445 | { |
| 1446 | struct linux_make_mappings_data *map_data |
| 1447 | = (struct linux_make_mappings_data *) data; |
| 1448 | gdb_byte buf[sizeof (ULONGEST)]; |
| 1449 | |
| 1450 | if (*filename == '\0' || inode == 0) |
| 1451 | return 0; |
| 1452 | |
| 1453 | ++map_data->file_count; |
| 1454 | |
| 1455 | pack_long (buf, map_data->long_type, vaddr); |
| 1456 | obstack_grow (map_data->data_obstack, buf, TYPE_LENGTH (map_data->long_type)); |
| 1457 | pack_long (buf, map_data->long_type, vaddr + size); |
| 1458 | obstack_grow (map_data->data_obstack, buf, TYPE_LENGTH (map_data->long_type)); |
| 1459 | pack_long (buf, map_data->long_type, offset); |
| 1460 | obstack_grow (map_data->data_obstack, buf, TYPE_LENGTH (map_data->long_type)); |
| 1461 | |
| 1462 | obstack_grow_str0 (map_data->filename_obstack, filename); |
| 1463 | |
| 1464 | return 0; |
| 1465 | } |
| 1466 | |
| 1467 | /* Write the file mapping data to the core file, if possible. OBFD is |
| 1468 | the output BFD. NOTE_DATA is the current note data, and NOTE_SIZE |
| 1469 | is a pointer to the note size. Returns the new NOTE_DATA and |
| 1470 | updates NOTE_SIZE. */ |
| 1471 | |
| 1472 | static char * |
| 1473 | linux_make_mappings_corefile_notes (struct gdbarch *gdbarch, bfd *obfd, |
| 1474 | char *note_data, int *note_size) |
| 1475 | { |
| 1476 | struct linux_make_mappings_data mapping_data; |
| 1477 | struct type *long_type |
| 1478 | = arch_integer_type (gdbarch, gdbarch_long_bit (gdbarch), 0, "long"); |
| 1479 | gdb_byte buf[sizeof (ULONGEST)]; |
| 1480 | |
| 1481 | auto_obstack data_obstack, filename_obstack; |
| 1482 | |
| 1483 | mapping_data.file_count = 0; |
| 1484 | mapping_data.data_obstack = &data_obstack; |
| 1485 | mapping_data.filename_obstack = &filename_obstack; |
| 1486 | mapping_data.long_type = long_type; |
| 1487 | |
| 1488 | /* Reserve space for the count. */ |
| 1489 | obstack_blank (&data_obstack, TYPE_LENGTH (long_type)); |
| 1490 | /* We always write the page size as 1 since we have no good way to |
| 1491 | determine the correct value. */ |
| 1492 | pack_long (buf, long_type, 1); |
| 1493 | obstack_grow (&data_obstack, buf, TYPE_LENGTH (long_type)); |
| 1494 | |
| 1495 | linux_find_memory_regions_full (gdbarch, linux_make_mappings_callback, |
| 1496 | &mapping_data); |
| 1497 | |
| 1498 | if (mapping_data.file_count != 0) |
| 1499 | { |
| 1500 | /* Write the count to the obstack. */ |
| 1501 | pack_long ((gdb_byte *) obstack_base (&data_obstack), |
| 1502 | long_type, mapping_data.file_count); |
| 1503 | |
| 1504 | /* Copy the filenames to the data obstack. */ |
| 1505 | int size = obstack_object_size (&filename_obstack); |
| 1506 | obstack_grow (&data_obstack, obstack_base (&filename_obstack), |
| 1507 | size); |
| 1508 | |
| 1509 | note_data = elfcore_write_note (obfd, note_data, note_size, |
| 1510 | "CORE", NT_FILE, |
| 1511 | obstack_base (&data_obstack), |
| 1512 | obstack_object_size (&data_obstack)); |
| 1513 | } |
| 1514 | |
| 1515 | return note_data; |
| 1516 | } |
| 1517 | |
| 1518 | /* Structure for passing information from |
| 1519 | linux_collect_thread_registers via an iterator to |
| 1520 | linux_collect_regset_section_cb. */ |
| 1521 | |
| 1522 | struct linux_collect_regset_section_cb_data |
| 1523 | { |
| 1524 | struct gdbarch *gdbarch; |
| 1525 | const struct regcache *regcache; |
| 1526 | bfd *obfd; |
| 1527 | char *note_data; |
| 1528 | int *note_size; |
| 1529 | unsigned long lwp; |
| 1530 | enum gdb_signal stop_signal; |
| 1531 | int abort_iteration; |
| 1532 | }; |
| 1533 | |
| 1534 | /* Callback for iterate_over_regset_sections that records a single |
| 1535 | regset in the corefile note section. */ |
| 1536 | |
| 1537 | static void |
| 1538 | linux_collect_regset_section_cb (const char *sect_name, int supply_size, |
| 1539 | int collect_size, const struct regset *regset, |
| 1540 | const char *human_name, void *cb_data) |
| 1541 | { |
| 1542 | struct linux_collect_regset_section_cb_data *data |
| 1543 | = (struct linux_collect_regset_section_cb_data *) cb_data; |
| 1544 | bool variable_size_section = (regset != NULL |
| 1545 | && regset->flags & REGSET_VARIABLE_SIZE); |
| 1546 | |
| 1547 | if (!variable_size_section) |
| 1548 | gdb_assert (supply_size == collect_size); |
| 1549 | |
| 1550 | if (data->abort_iteration) |
| 1551 | return; |
| 1552 | |
| 1553 | gdb_assert (regset && regset->collect_regset); |
| 1554 | |
| 1555 | /* This is intentionally zero-initialized by using std::vector, so |
| 1556 | that any padding bytes in the core file will show as 0. */ |
| 1557 | std::vector<gdb_byte> buf (collect_size); |
| 1558 | |
| 1559 | regset->collect_regset (regset, data->regcache, -1, buf.data (), |
| 1560 | collect_size); |
| 1561 | |
| 1562 | /* PRSTATUS still needs to be treated specially. */ |
| 1563 | if (strcmp (sect_name, ".reg") == 0) |
| 1564 | data->note_data = (char *) elfcore_write_prstatus |
| 1565 | (data->obfd, data->note_data, data->note_size, data->lwp, |
| 1566 | gdb_signal_to_host (data->stop_signal), buf.data ()); |
| 1567 | else |
| 1568 | data->note_data = (char *) elfcore_write_register_note |
| 1569 | (data->obfd, data->note_data, data->note_size, |
| 1570 | sect_name, buf.data (), collect_size); |
| 1571 | |
| 1572 | if (data->note_data == NULL) |
| 1573 | data->abort_iteration = 1; |
| 1574 | } |
| 1575 | |
| 1576 | /* Records the thread's register state for the corefile note |
| 1577 | section. */ |
| 1578 | |
| 1579 | static char * |
| 1580 | linux_collect_thread_registers (const struct regcache *regcache, |
| 1581 | ptid_t ptid, bfd *obfd, |
| 1582 | char *note_data, int *note_size, |
| 1583 | enum gdb_signal stop_signal) |
| 1584 | { |
| 1585 | struct gdbarch *gdbarch = regcache->arch (); |
| 1586 | struct linux_collect_regset_section_cb_data data; |
| 1587 | |
| 1588 | data.gdbarch = gdbarch; |
| 1589 | data.regcache = regcache; |
| 1590 | data.obfd = obfd; |
| 1591 | data.note_data = note_data; |
| 1592 | data.note_size = note_size; |
| 1593 | data.stop_signal = stop_signal; |
| 1594 | data.abort_iteration = 0; |
| 1595 | |
| 1596 | /* For remote targets the LWP may not be available, so use the TID. */ |
| 1597 | data.lwp = ptid.lwp (); |
| 1598 | if (!data.lwp) |
| 1599 | data.lwp = ptid.tid (); |
| 1600 | |
| 1601 | gdbarch_iterate_over_regset_sections (gdbarch, |
| 1602 | linux_collect_regset_section_cb, |
| 1603 | &data, regcache); |
| 1604 | return data.note_data; |
| 1605 | } |
| 1606 | |
| 1607 | /* Fetch the siginfo data for the specified thread, if it exists. If |
| 1608 | there is no data, or we could not read it, return an empty |
| 1609 | buffer. */ |
| 1610 | |
| 1611 | static gdb::byte_vector |
| 1612 | linux_get_siginfo_data (thread_info *thread, struct gdbarch *gdbarch) |
| 1613 | { |
| 1614 | struct type *siginfo_type; |
| 1615 | LONGEST bytes_read; |
| 1616 | |
| 1617 | if (!gdbarch_get_siginfo_type_p (gdbarch)) |
| 1618 | return gdb::byte_vector (); |
| 1619 | |
| 1620 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); |
| 1621 | inferior_ptid = thread->ptid; |
| 1622 | |
| 1623 | siginfo_type = gdbarch_get_siginfo_type (gdbarch); |
| 1624 | |
| 1625 | gdb::byte_vector buf (TYPE_LENGTH (siginfo_type)); |
| 1626 | |
| 1627 | bytes_read = target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, |
| 1628 | buf.data (), 0, TYPE_LENGTH (siginfo_type)); |
| 1629 | if (bytes_read != TYPE_LENGTH (siginfo_type)) |
| 1630 | buf.clear (); |
| 1631 | |
| 1632 | return buf; |
| 1633 | } |
| 1634 | |
| 1635 | struct linux_corefile_thread_data |
| 1636 | { |
| 1637 | struct gdbarch *gdbarch; |
| 1638 | bfd *obfd; |
| 1639 | char *note_data; |
| 1640 | int *note_size; |
| 1641 | enum gdb_signal stop_signal; |
| 1642 | }; |
| 1643 | |
| 1644 | /* Records the thread's register state for the corefile note |
| 1645 | section. */ |
| 1646 | |
| 1647 | static void |
| 1648 | linux_corefile_thread (struct thread_info *info, |
| 1649 | struct linux_corefile_thread_data *args) |
| 1650 | { |
| 1651 | struct regcache *regcache; |
| 1652 | |
| 1653 | regcache = get_thread_arch_regcache (info->ptid, args->gdbarch); |
| 1654 | |
| 1655 | target_fetch_registers (regcache, -1); |
| 1656 | gdb::byte_vector siginfo_data = linux_get_siginfo_data (info, args->gdbarch); |
| 1657 | |
| 1658 | args->note_data = linux_collect_thread_registers |
| 1659 | (regcache, info->ptid, args->obfd, args->note_data, |
| 1660 | args->note_size, args->stop_signal); |
| 1661 | |
| 1662 | /* Don't return anything if we got no register information above, |
| 1663 | such a core file is useless. */ |
| 1664 | if (args->note_data != NULL) |
| 1665 | if (!siginfo_data.empty ()) |
| 1666 | args->note_data = elfcore_write_note (args->obfd, |
| 1667 | args->note_data, |
| 1668 | args->note_size, |
| 1669 | "CORE", NT_SIGINFO, |
| 1670 | siginfo_data.data (), |
| 1671 | siginfo_data.size ()); |
| 1672 | } |
| 1673 | |
| 1674 | /* Fill the PRPSINFO structure with information about the process being |
| 1675 | debugged. Returns 1 in case of success, 0 for failures. Please note that |
| 1676 | even if the structure cannot be entirely filled (e.g., GDB was unable to |
| 1677 | gather information about the process UID/GID), this function will still |
| 1678 | return 1 since some information was already recorded. It will only return |
| 1679 | 0 iff nothing can be gathered. */ |
| 1680 | |
| 1681 | static int |
| 1682 | linux_fill_prpsinfo (struct elf_internal_linux_prpsinfo *p) |
| 1683 | { |
| 1684 | /* The filename which we will use to obtain some info about the process. |
| 1685 | We will basically use this to store the `/proc/PID/FILENAME' file. */ |
| 1686 | char filename[100]; |
| 1687 | /* The basename of the executable. */ |
| 1688 | const char *basename; |
| 1689 | const char *infargs; |
| 1690 | /* Temporary buffer. */ |
| 1691 | char *tmpstr; |
| 1692 | /* The valid states of a process, according to the Linux kernel. */ |
| 1693 | const char valid_states[] = "RSDTZW"; |
| 1694 | /* The program state. */ |
| 1695 | const char *prog_state; |
| 1696 | /* The state of the process. */ |
| 1697 | char pr_sname; |
| 1698 | /* The PID of the program which generated the corefile. */ |
| 1699 | pid_t pid; |
| 1700 | /* Process flags. */ |
| 1701 | unsigned int pr_flag; |
| 1702 | /* Process nice value. */ |
| 1703 | long pr_nice; |
| 1704 | /* The number of fields read by `sscanf'. */ |
| 1705 | int n_fields = 0; |
| 1706 | |
| 1707 | gdb_assert (p != NULL); |
| 1708 | |
| 1709 | /* Obtaining PID and filename. */ |
| 1710 | pid = inferior_ptid.pid (); |
| 1711 | xsnprintf (filename, sizeof (filename), "/proc/%d/cmdline", (int) pid); |
| 1712 | /* The full name of the program which generated the corefile. */ |
| 1713 | gdb::unique_xmalloc_ptr<char> fname |
| 1714 | = target_fileio_read_stralloc (NULL, filename); |
| 1715 | |
| 1716 | if (fname == NULL || fname.get ()[0] == '\0') |
| 1717 | { |
| 1718 | /* No program name was read, so we won't be able to retrieve more |
| 1719 | information about the process. */ |
| 1720 | return 0; |
| 1721 | } |
| 1722 | |
| 1723 | memset (p, 0, sizeof (*p)); |
| 1724 | |
| 1725 | /* Defining the PID. */ |
| 1726 | p->pr_pid = pid; |
| 1727 | |
| 1728 | /* Copying the program name. Only the basename matters. */ |
| 1729 | basename = lbasename (fname.get ()); |
| 1730 | strncpy (p->pr_fname, basename, sizeof (p->pr_fname)); |
| 1731 | p->pr_fname[sizeof (p->pr_fname) - 1] = '\0'; |
| 1732 | |
| 1733 | infargs = get_inferior_args (); |
| 1734 | |
| 1735 | /* The arguments of the program. */ |
| 1736 | std::string psargs = fname.get (); |
| 1737 | if (infargs != NULL) |
| 1738 | psargs = psargs + " " + infargs; |
| 1739 | |
| 1740 | strncpy (p->pr_psargs, psargs.c_str (), sizeof (p->pr_psargs)); |
| 1741 | p->pr_psargs[sizeof (p->pr_psargs) - 1] = '\0'; |
| 1742 | |
| 1743 | xsnprintf (filename, sizeof (filename), "/proc/%d/stat", (int) pid); |
| 1744 | /* The contents of `/proc/PID/stat'. */ |
| 1745 | gdb::unique_xmalloc_ptr<char> proc_stat_contents |
| 1746 | = target_fileio_read_stralloc (NULL, filename); |
| 1747 | char *proc_stat = proc_stat_contents.get (); |
| 1748 | |
| 1749 | if (proc_stat == NULL || *proc_stat == '\0') |
| 1750 | { |
| 1751 | /* Despite being unable to read more information about the |
| 1752 | process, we return 1 here because at least we have its |
| 1753 | command line, PID and arguments. */ |
| 1754 | return 1; |
| 1755 | } |
| 1756 | |
| 1757 | /* Ok, we have the stats. It's time to do a little parsing of the |
| 1758 | contents of the buffer, so that we end up reading what we want. |
| 1759 | |
| 1760 | The following parsing mechanism is strongly based on the |
| 1761 | information generated by the `fs/proc/array.c' file, present in |
| 1762 | the Linux kernel tree. More details about how the information is |
| 1763 | displayed can be obtained by seeing the manpage of proc(5), |
| 1764 | specifically under the entry of `/proc/[pid]/stat'. */ |
| 1765 | |
| 1766 | /* Getting rid of the PID, since we already have it. */ |
| 1767 | while (isdigit (*proc_stat)) |
| 1768 | ++proc_stat; |
| 1769 | |
| 1770 | proc_stat = skip_spaces (proc_stat); |
| 1771 | |
| 1772 | /* ps command also relies on no trailing fields ever contain ')'. */ |
| 1773 | proc_stat = strrchr (proc_stat, ')'); |
| 1774 | if (proc_stat == NULL) |
| 1775 | return 1; |
| 1776 | proc_stat++; |
| 1777 | |
| 1778 | proc_stat = skip_spaces (proc_stat); |
| 1779 | |
| 1780 | n_fields = sscanf (proc_stat, |
| 1781 | "%c" /* Process state. */ |
| 1782 | "%d%d%d" /* Parent PID, group ID, session ID. */ |
| 1783 | "%*d%*d" /* tty_nr, tpgid (not used). */ |
| 1784 | "%u" /* Flags. */ |
| 1785 | "%*s%*s%*s%*s" /* minflt, cminflt, majflt, |
| 1786 | cmajflt (not used). */ |
| 1787 | "%*s%*s%*s%*s" /* utime, stime, cutime, |
| 1788 | cstime (not used). */ |
| 1789 | "%*s" /* Priority (not used). */ |
| 1790 | "%ld", /* Nice. */ |
| 1791 | &pr_sname, |
| 1792 | &p->pr_ppid, &p->pr_pgrp, &p->pr_sid, |
| 1793 | &pr_flag, |
| 1794 | &pr_nice); |
| 1795 | |
| 1796 | if (n_fields != 6) |
| 1797 | { |
| 1798 | /* Again, we couldn't read the complementary information about |
| 1799 | the process state. However, we already have minimal |
| 1800 | information, so we just return 1 here. */ |
| 1801 | return 1; |
| 1802 | } |
| 1803 | |
| 1804 | /* Filling the structure fields. */ |
| 1805 | prog_state = strchr (valid_states, pr_sname); |
| 1806 | if (prog_state != NULL) |
| 1807 | p->pr_state = prog_state - valid_states; |
| 1808 | else |
| 1809 | { |
| 1810 | /* Zero means "Running". */ |
| 1811 | p->pr_state = 0; |
| 1812 | } |
| 1813 | |
| 1814 | p->pr_sname = p->pr_state > 5 ? '.' : pr_sname; |
| 1815 | p->pr_zomb = p->pr_sname == 'Z'; |
| 1816 | p->pr_nice = pr_nice; |
| 1817 | p->pr_flag = pr_flag; |
| 1818 | |
| 1819 | /* Finally, obtaining the UID and GID. For that, we read and parse the |
| 1820 | contents of the `/proc/PID/status' file. */ |
| 1821 | xsnprintf (filename, sizeof (filename), "/proc/%d/status", (int) pid); |
| 1822 | /* The contents of `/proc/PID/status'. */ |
| 1823 | gdb::unique_xmalloc_ptr<char> proc_status_contents |
| 1824 | = target_fileio_read_stralloc (NULL, filename); |
| 1825 | char *proc_status = proc_status_contents.get (); |
| 1826 | |
| 1827 | if (proc_status == NULL || *proc_status == '\0') |
| 1828 | { |
| 1829 | /* Returning 1 since we already have a bunch of information. */ |
| 1830 | return 1; |
| 1831 | } |
| 1832 | |
| 1833 | /* Extracting the UID. */ |
| 1834 | tmpstr = strstr (proc_status, "Uid:"); |
| 1835 | if (tmpstr != NULL) |
| 1836 | { |
| 1837 | /* Advancing the pointer to the beginning of the UID. */ |
| 1838 | tmpstr += sizeof ("Uid:"); |
| 1839 | while (*tmpstr != '\0' && !isdigit (*tmpstr)) |
| 1840 | ++tmpstr; |
| 1841 | |
| 1842 | if (isdigit (*tmpstr)) |
| 1843 | p->pr_uid = strtol (tmpstr, &tmpstr, 10); |
| 1844 | } |
| 1845 | |
| 1846 | /* Extracting the GID. */ |
| 1847 | tmpstr = strstr (proc_status, "Gid:"); |
| 1848 | if (tmpstr != NULL) |
| 1849 | { |
| 1850 | /* Advancing the pointer to the beginning of the GID. */ |
| 1851 | tmpstr += sizeof ("Gid:"); |
| 1852 | while (*tmpstr != '\0' && !isdigit (*tmpstr)) |
| 1853 | ++tmpstr; |
| 1854 | |
| 1855 | if (isdigit (*tmpstr)) |
| 1856 | p->pr_gid = strtol (tmpstr, &tmpstr, 10); |
| 1857 | } |
| 1858 | |
| 1859 | return 1; |
| 1860 | } |
| 1861 | |
| 1862 | /* Build the note section for a corefile, and return it in a malloc |
| 1863 | buffer. */ |
| 1864 | |
| 1865 | static char * |
| 1866 | linux_make_corefile_notes (struct gdbarch *gdbarch, bfd *obfd, int *note_size) |
| 1867 | { |
| 1868 | struct linux_corefile_thread_data thread_args; |
| 1869 | struct elf_internal_linux_prpsinfo prpsinfo; |
| 1870 | char *note_data = NULL; |
| 1871 | struct thread_info *curr_thr, *signalled_thr; |
| 1872 | |
| 1873 | if (! gdbarch_iterate_over_regset_sections_p (gdbarch)) |
| 1874 | return NULL; |
| 1875 | |
| 1876 | if (linux_fill_prpsinfo (&prpsinfo)) |
| 1877 | { |
| 1878 | if (gdbarch_ptr_bit (gdbarch) == 64) |
| 1879 | note_data = elfcore_write_linux_prpsinfo64 (obfd, |
| 1880 | note_data, note_size, |
| 1881 | &prpsinfo); |
| 1882 | else |
| 1883 | note_data = elfcore_write_linux_prpsinfo32 (obfd, |
| 1884 | note_data, note_size, |
| 1885 | &prpsinfo); |
| 1886 | } |
| 1887 | |
| 1888 | /* Thread register information. */ |
| 1889 | try |
| 1890 | { |
| 1891 | update_thread_list (); |
| 1892 | } |
| 1893 | catch (const gdb_exception_error &e) |
| 1894 | { |
| 1895 | exception_print (gdb_stderr, e); |
| 1896 | } |
| 1897 | |
| 1898 | /* Like the kernel, prefer dumping the signalled thread first. |
| 1899 | "First thread" is what tools use to infer the signalled thread. |
| 1900 | In case there's more than one signalled thread, prefer the |
| 1901 | current thread, if it is signalled. */ |
| 1902 | curr_thr = inferior_thread (); |
| 1903 | if (curr_thr->suspend.stop_signal != GDB_SIGNAL_0) |
| 1904 | signalled_thr = curr_thr; |
| 1905 | else |
| 1906 | { |
| 1907 | signalled_thr = iterate_over_threads (find_signalled_thread, NULL); |
| 1908 | if (signalled_thr == NULL) |
| 1909 | signalled_thr = curr_thr; |
| 1910 | } |
| 1911 | |
| 1912 | thread_args.gdbarch = gdbarch; |
| 1913 | thread_args.obfd = obfd; |
| 1914 | thread_args.note_data = note_data; |
| 1915 | thread_args.note_size = note_size; |
| 1916 | thread_args.stop_signal = signalled_thr->suspend.stop_signal; |
| 1917 | |
| 1918 | linux_corefile_thread (signalled_thr, &thread_args); |
| 1919 | for (thread_info *thr : current_inferior ()->non_exited_threads ()) |
| 1920 | { |
| 1921 | if (thr == signalled_thr) |
| 1922 | continue; |
| 1923 | |
| 1924 | linux_corefile_thread (thr, &thread_args); |
| 1925 | } |
| 1926 | |
| 1927 | note_data = thread_args.note_data; |
| 1928 | if (!note_data) |
| 1929 | return NULL; |
| 1930 | |
| 1931 | /* Auxillary vector. */ |
| 1932 | gdb::optional<gdb::byte_vector> auxv = |
| 1933 | target_read_alloc (current_top_target (), TARGET_OBJECT_AUXV, NULL); |
| 1934 | if (auxv && !auxv->empty ()) |
| 1935 | { |
| 1936 | note_data = elfcore_write_note (obfd, note_data, note_size, |
| 1937 | "CORE", NT_AUXV, auxv->data (), |
| 1938 | auxv->size ()); |
| 1939 | |
| 1940 | if (!note_data) |
| 1941 | return NULL; |
| 1942 | } |
| 1943 | |
| 1944 | /* File mappings. */ |
| 1945 | note_data = linux_make_mappings_corefile_notes (gdbarch, obfd, |
| 1946 | note_data, note_size); |
| 1947 | |
| 1948 | return note_data; |
| 1949 | } |
| 1950 | |
| 1951 | /* Implementation of `gdbarch_gdb_signal_from_target', as defined in |
| 1952 | gdbarch.h. This function is not static because it is exported to |
| 1953 | other -tdep files. */ |
| 1954 | |
| 1955 | enum gdb_signal |
| 1956 | linux_gdb_signal_from_target (struct gdbarch *gdbarch, int signal) |
| 1957 | { |
| 1958 | switch (signal) |
| 1959 | { |
| 1960 | case 0: |
| 1961 | return GDB_SIGNAL_0; |
| 1962 | |
| 1963 | case LINUX_SIGHUP: |
| 1964 | return GDB_SIGNAL_HUP; |
| 1965 | |
| 1966 | case LINUX_SIGINT: |
| 1967 | return GDB_SIGNAL_INT; |
| 1968 | |
| 1969 | case LINUX_SIGQUIT: |
| 1970 | return GDB_SIGNAL_QUIT; |
| 1971 | |
| 1972 | case LINUX_SIGILL: |
| 1973 | return GDB_SIGNAL_ILL; |
| 1974 | |
| 1975 | case LINUX_SIGTRAP: |
| 1976 | return GDB_SIGNAL_TRAP; |
| 1977 | |
| 1978 | case LINUX_SIGABRT: |
| 1979 | return GDB_SIGNAL_ABRT; |
| 1980 | |
| 1981 | case LINUX_SIGBUS: |
| 1982 | return GDB_SIGNAL_BUS; |
| 1983 | |
| 1984 | case LINUX_SIGFPE: |
| 1985 | return GDB_SIGNAL_FPE; |
| 1986 | |
| 1987 | case LINUX_SIGKILL: |
| 1988 | return GDB_SIGNAL_KILL; |
| 1989 | |
| 1990 | case LINUX_SIGUSR1: |
| 1991 | return GDB_SIGNAL_USR1; |
| 1992 | |
| 1993 | case LINUX_SIGSEGV: |
| 1994 | return GDB_SIGNAL_SEGV; |
| 1995 | |
| 1996 | case LINUX_SIGUSR2: |
| 1997 | return GDB_SIGNAL_USR2; |
| 1998 | |
| 1999 | case LINUX_SIGPIPE: |
| 2000 | return GDB_SIGNAL_PIPE; |
| 2001 | |
| 2002 | case LINUX_SIGALRM: |
| 2003 | return GDB_SIGNAL_ALRM; |
| 2004 | |
| 2005 | case LINUX_SIGTERM: |
| 2006 | return GDB_SIGNAL_TERM; |
| 2007 | |
| 2008 | case LINUX_SIGCHLD: |
| 2009 | return GDB_SIGNAL_CHLD; |
| 2010 | |
| 2011 | case LINUX_SIGCONT: |
| 2012 | return GDB_SIGNAL_CONT; |
| 2013 | |
| 2014 | case LINUX_SIGSTOP: |
| 2015 | return GDB_SIGNAL_STOP; |
| 2016 | |
| 2017 | case LINUX_SIGTSTP: |
| 2018 | return GDB_SIGNAL_TSTP; |
| 2019 | |
| 2020 | case LINUX_SIGTTIN: |
| 2021 | return GDB_SIGNAL_TTIN; |
| 2022 | |
| 2023 | case LINUX_SIGTTOU: |
| 2024 | return GDB_SIGNAL_TTOU; |
| 2025 | |
| 2026 | case LINUX_SIGURG: |
| 2027 | return GDB_SIGNAL_URG; |
| 2028 | |
| 2029 | case LINUX_SIGXCPU: |
| 2030 | return GDB_SIGNAL_XCPU; |
| 2031 | |
| 2032 | case LINUX_SIGXFSZ: |
| 2033 | return GDB_SIGNAL_XFSZ; |
| 2034 | |
| 2035 | case LINUX_SIGVTALRM: |
| 2036 | return GDB_SIGNAL_VTALRM; |
| 2037 | |
| 2038 | case LINUX_SIGPROF: |
| 2039 | return GDB_SIGNAL_PROF; |
| 2040 | |
| 2041 | case LINUX_SIGWINCH: |
| 2042 | return GDB_SIGNAL_WINCH; |
| 2043 | |
| 2044 | /* No way to differentiate between SIGIO and SIGPOLL. |
| 2045 | Therefore, we just handle the first one. */ |
| 2046 | case LINUX_SIGIO: |
| 2047 | return GDB_SIGNAL_IO; |
| 2048 | |
| 2049 | case LINUX_SIGPWR: |
| 2050 | return GDB_SIGNAL_PWR; |
| 2051 | |
| 2052 | case LINUX_SIGSYS: |
| 2053 | return GDB_SIGNAL_SYS; |
| 2054 | |
| 2055 | /* SIGRTMIN and SIGRTMAX are not continuous in <gdb/signals.def>, |
| 2056 | therefore we have to handle them here. */ |
| 2057 | case LINUX_SIGRTMIN: |
| 2058 | return GDB_SIGNAL_REALTIME_32; |
| 2059 | |
| 2060 | case LINUX_SIGRTMAX: |
| 2061 | return GDB_SIGNAL_REALTIME_64; |
| 2062 | } |
| 2063 | |
| 2064 | if (signal >= LINUX_SIGRTMIN + 1 && signal <= LINUX_SIGRTMAX - 1) |
| 2065 | { |
| 2066 | int offset = signal - LINUX_SIGRTMIN + 1; |
| 2067 | |
| 2068 | return (enum gdb_signal) ((int) GDB_SIGNAL_REALTIME_33 + offset); |
| 2069 | } |
| 2070 | |
| 2071 | return GDB_SIGNAL_UNKNOWN; |
| 2072 | } |
| 2073 | |
| 2074 | /* Implementation of `gdbarch_gdb_signal_to_target', as defined in |
| 2075 | gdbarch.h. This function is not static because it is exported to |
| 2076 | other -tdep files. */ |
| 2077 | |
| 2078 | int |
| 2079 | linux_gdb_signal_to_target (struct gdbarch *gdbarch, |
| 2080 | enum gdb_signal signal) |
| 2081 | { |
| 2082 | switch (signal) |
| 2083 | { |
| 2084 | case GDB_SIGNAL_0: |
| 2085 | return 0; |
| 2086 | |
| 2087 | case GDB_SIGNAL_HUP: |
| 2088 | return LINUX_SIGHUP; |
| 2089 | |
| 2090 | case GDB_SIGNAL_INT: |
| 2091 | return LINUX_SIGINT; |
| 2092 | |
| 2093 | case GDB_SIGNAL_QUIT: |
| 2094 | return LINUX_SIGQUIT; |
| 2095 | |
| 2096 | case GDB_SIGNAL_ILL: |
| 2097 | return LINUX_SIGILL; |
| 2098 | |
| 2099 | case GDB_SIGNAL_TRAP: |
| 2100 | return LINUX_SIGTRAP; |
| 2101 | |
| 2102 | case GDB_SIGNAL_ABRT: |
| 2103 | return LINUX_SIGABRT; |
| 2104 | |
| 2105 | case GDB_SIGNAL_FPE: |
| 2106 | return LINUX_SIGFPE; |
| 2107 | |
| 2108 | case GDB_SIGNAL_KILL: |
| 2109 | return LINUX_SIGKILL; |
| 2110 | |
| 2111 | case GDB_SIGNAL_BUS: |
| 2112 | return LINUX_SIGBUS; |
| 2113 | |
| 2114 | case GDB_SIGNAL_SEGV: |
| 2115 | return LINUX_SIGSEGV; |
| 2116 | |
| 2117 | case GDB_SIGNAL_SYS: |
| 2118 | return LINUX_SIGSYS; |
| 2119 | |
| 2120 | case GDB_SIGNAL_PIPE: |
| 2121 | return LINUX_SIGPIPE; |
| 2122 | |
| 2123 | case GDB_SIGNAL_ALRM: |
| 2124 | return LINUX_SIGALRM; |
| 2125 | |
| 2126 | case GDB_SIGNAL_TERM: |
| 2127 | return LINUX_SIGTERM; |
| 2128 | |
| 2129 | case GDB_SIGNAL_URG: |
| 2130 | return LINUX_SIGURG; |
| 2131 | |
| 2132 | case GDB_SIGNAL_STOP: |
| 2133 | return LINUX_SIGSTOP; |
| 2134 | |
| 2135 | case GDB_SIGNAL_TSTP: |
| 2136 | return LINUX_SIGTSTP; |
| 2137 | |
| 2138 | case GDB_SIGNAL_CONT: |
| 2139 | return LINUX_SIGCONT; |
| 2140 | |
| 2141 | case GDB_SIGNAL_CHLD: |
| 2142 | return LINUX_SIGCHLD; |
| 2143 | |
| 2144 | case GDB_SIGNAL_TTIN: |
| 2145 | return LINUX_SIGTTIN; |
| 2146 | |
| 2147 | case GDB_SIGNAL_TTOU: |
| 2148 | return LINUX_SIGTTOU; |
| 2149 | |
| 2150 | case GDB_SIGNAL_IO: |
| 2151 | return LINUX_SIGIO; |
| 2152 | |
| 2153 | case GDB_SIGNAL_XCPU: |
| 2154 | return LINUX_SIGXCPU; |
| 2155 | |
| 2156 | case GDB_SIGNAL_XFSZ: |
| 2157 | return LINUX_SIGXFSZ; |
| 2158 | |
| 2159 | case GDB_SIGNAL_VTALRM: |
| 2160 | return LINUX_SIGVTALRM; |
| 2161 | |
| 2162 | case GDB_SIGNAL_PROF: |
| 2163 | return LINUX_SIGPROF; |
| 2164 | |
| 2165 | case GDB_SIGNAL_WINCH: |
| 2166 | return LINUX_SIGWINCH; |
| 2167 | |
| 2168 | case GDB_SIGNAL_USR1: |
| 2169 | return LINUX_SIGUSR1; |
| 2170 | |
| 2171 | case GDB_SIGNAL_USR2: |
| 2172 | return LINUX_SIGUSR2; |
| 2173 | |
| 2174 | case GDB_SIGNAL_PWR: |
| 2175 | return LINUX_SIGPWR; |
| 2176 | |
| 2177 | case GDB_SIGNAL_POLL: |
| 2178 | return LINUX_SIGPOLL; |
| 2179 | |
| 2180 | /* GDB_SIGNAL_REALTIME_32 is not continuous in <gdb/signals.def>, |
| 2181 | therefore we have to handle it here. */ |
| 2182 | case GDB_SIGNAL_REALTIME_32: |
| 2183 | return LINUX_SIGRTMIN; |
| 2184 | |
| 2185 | /* Same comment applies to _64. */ |
| 2186 | case GDB_SIGNAL_REALTIME_64: |
| 2187 | return LINUX_SIGRTMAX; |
| 2188 | } |
| 2189 | |
| 2190 | /* GDB_SIGNAL_REALTIME_33 to _64 are continuous. */ |
| 2191 | if (signal >= GDB_SIGNAL_REALTIME_33 |
| 2192 | && signal <= GDB_SIGNAL_REALTIME_63) |
| 2193 | { |
| 2194 | int offset = signal - GDB_SIGNAL_REALTIME_33; |
| 2195 | |
| 2196 | return LINUX_SIGRTMIN + 1 + offset; |
| 2197 | } |
| 2198 | |
| 2199 | return -1; |
| 2200 | } |
| 2201 | |
| 2202 | /* Helper for linux_vsyscall_range that does the real work of finding |
| 2203 | the vsyscall's address range. */ |
| 2204 | |
| 2205 | static int |
| 2206 | linux_vsyscall_range_raw (struct gdbarch *gdbarch, struct mem_range *range) |
| 2207 | { |
| 2208 | char filename[100]; |
| 2209 | long pid; |
| 2210 | |
| 2211 | if (target_auxv_search (current_top_target (), AT_SYSINFO_EHDR, &range->start) <= 0) |
| 2212 | return 0; |
| 2213 | |
| 2214 | /* It doesn't make sense to access the host's /proc when debugging a |
| 2215 | core file. Instead, look for the PT_LOAD segment that matches |
| 2216 | the vDSO. */ |
| 2217 | if (!target_has_execution) |
| 2218 | { |
| 2219 | long phdrs_size; |
| 2220 | int num_phdrs, i; |
| 2221 | |
| 2222 | phdrs_size = bfd_get_elf_phdr_upper_bound (core_bfd); |
| 2223 | if (phdrs_size == -1) |
| 2224 | return 0; |
| 2225 | |
| 2226 | gdb::unique_xmalloc_ptr<Elf_Internal_Phdr> |
| 2227 | phdrs ((Elf_Internal_Phdr *) xmalloc (phdrs_size)); |
| 2228 | num_phdrs = bfd_get_elf_phdrs (core_bfd, phdrs.get ()); |
| 2229 | if (num_phdrs == -1) |
| 2230 | return 0; |
| 2231 | |
| 2232 | for (i = 0; i < num_phdrs; i++) |
| 2233 | if (phdrs.get ()[i].p_type == PT_LOAD |
| 2234 | && phdrs.get ()[i].p_vaddr == range->start) |
| 2235 | { |
| 2236 | range->length = phdrs.get ()[i].p_memsz; |
| 2237 | return 1; |
| 2238 | } |
| 2239 | |
| 2240 | return 0; |
| 2241 | } |
| 2242 | |
| 2243 | /* We need to know the real target PID to access /proc. */ |
| 2244 | if (current_inferior ()->fake_pid_p) |
| 2245 | return 0; |
| 2246 | |
| 2247 | pid = current_inferior ()->pid; |
| 2248 | |
| 2249 | /* Note that reading /proc/PID/task/PID/maps (1) is much faster than |
| 2250 | reading /proc/PID/maps (2). The later identifies thread stacks |
| 2251 | in the output, which requires scanning every thread in the thread |
| 2252 | group to check whether a VMA is actually a thread's stack. With |
| 2253 | Linux 4.4 on an Intel i7-4810MQ @ 2.80GHz, with an inferior with |
| 2254 | a few thousand threads, (1) takes a few miliseconds, while (2) |
| 2255 | takes several seconds. Also note that "smaps", what we read for |
| 2256 | determining core dump mappings, is even slower than "maps". */ |
| 2257 | xsnprintf (filename, sizeof filename, "/proc/%ld/task/%ld/maps", pid, pid); |
| 2258 | gdb::unique_xmalloc_ptr<char> data |
| 2259 | = target_fileio_read_stralloc (NULL, filename); |
| 2260 | if (data != NULL) |
| 2261 | { |
| 2262 | char *line; |
| 2263 | char *saveptr = NULL; |
| 2264 | |
| 2265 | for (line = strtok_r (data.get (), "\n", &saveptr); |
| 2266 | line != NULL; |
| 2267 | line = strtok_r (NULL, "\n", &saveptr)) |
| 2268 | { |
| 2269 | ULONGEST addr, endaddr; |
| 2270 | const char *p = line; |
| 2271 | |
| 2272 | addr = strtoulst (p, &p, 16); |
| 2273 | if (addr == range->start) |
| 2274 | { |
| 2275 | if (*p == '-') |
| 2276 | p++; |
| 2277 | endaddr = strtoulst (p, &p, 16); |
| 2278 | range->length = endaddr - addr; |
| 2279 | return 1; |
| 2280 | } |
| 2281 | } |
| 2282 | } |
| 2283 | else |
| 2284 | warning (_("unable to open /proc file '%s'"), filename); |
| 2285 | |
| 2286 | return 0; |
| 2287 | } |
| 2288 | |
| 2289 | /* Implementation of the "vsyscall_range" gdbarch hook. Handles |
| 2290 | caching, and defers the real work to linux_vsyscall_range_raw. */ |
| 2291 | |
| 2292 | static int |
| 2293 | linux_vsyscall_range (struct gdbarch *gdbarch, struct mem_range *range) |
| 2294 | { |
| 2295 | struct linux_info *info = get_linux_inferior_data (); |
| 2296 | |
| 2297 | if (info->vsyscall_range_p == 0) |
| 2298 | { |
| 2299 | if (linux_vsyscall_range_raw (gdbarch, &info->vsyscall_range)) |
| 2300 | info->vsyscall_range_p = 1; |
| 2301 | else |
| 2302 | info->vsyscall_range_p = -1; |
| 2303 | } |
| 2304 | |
| 2305 | if (info->vsyscall_range_p < 0) |
| 2306 | return 0; |
| 2307 | |
| 2308 | *range = info->vsyscall_range; |
| 2309 | return 1; |
| 2310 | } |
| 2311 | |
| 2312 | /* Symbols for linux_infcall_mmap's ARG_FLAGS; their Linux MAP_* system |
| 2313 | definitions would be dependent on compilation host. */ |
| 2314 | #define GDB_MMAP_MAP_PRIVATE 0x02 /* Changes are private. */ |
| 2315 | #define GDB_MMAP_MAP_ANONYMOUS 0x20 /* Don't use a file. */ |
| 2316 | |
| 2317 | /* See gdbarch.sh 'infcall_mmap'. */ |
| 2318 | |
| 2319 | static CORE_ADDR |
| 2320 | linux_infcall_mmap (CORE_ADDR size, unsigned prot) |
| 2321 | { |
| 2322 | struct objfile *objf; |
| 2323 | /* Do there still exist any Linux systems without "mmap64"? |
| 2324 | "mmap" uses 64-bit off_t on x86_64 and 32-bit off_t on i386 and x32. */ |
| 2325 | struct value *mmap_val = find_function_in_inferior ("mmap64", &objf); |
| 2326 | struct value *addr_val; |
| 2327 | struct gdbarch *gdbarch = get_objfile_arch (objf); |
| 2328 | CORE_ADDR retval; |
| 2329 | enum |
| 2330 | { |
| 2331 | ARG_ADDR, ARG_LENGTH, ARG_PROT, ARG_FLAGS, ARG_FD, ARG_OFFSET, ARG_LAST |
| 2332 | }; |
| 2333 | struct value *arg[ARG_LAST]; |
| 2334 | |
| 2335 | arg[ARG_ADDR] = value_from_pointer (builtin_type (gdbarch)->builtin_data_ptr, |
| 2336 | 0); |
| 2337 | /* Assuming sizeof (unsigned long) == sizeof (size_t). */ |
| 2338 | arg[ARG_LENGTH] = value_from_ulongest |
| 2339 | (builtin_type (gdbarch)->builtin_unsigned_long, size); |
| 2340 | gdb_assert ((prot & ~(GDB_MMAP_PROT_READ | GDB_MMAP_PROT_WRITE |
| 2341 | | GDB_MMAP_PROT_EXEC)) |
| 2342 | == 0); |
| 2343 | arg[ARG_PROT] = value_from_longest (builtin_type (gdbarch)->builtin_int, prot); |
| 2344 | arg[ARG_FLAGS] = value_from_longest (builtin_type (gdbarch)->builtin_int, |
| 2345 | GDB_MMAP_MAP_PRIVATE |
| 2346 | | GDB_MMAP_MAP_ANONYMOUS); |
| 2347 | arg[ARG_FD] = value_from_longest (builtin_type (gdbarch)->builtin_int, -1); |
| 2348 | arg[ARG_OFFSET] = value_from_longest (builtin_type (gdbarch)->builtin_int64, |
| 2349 | 0); |
| 2350 | addr_val = call_function_by_hand (mmap_val, NULL, arg); |
| 2351 | retval = value_as_address (addr_val); |
| 2352 | if (retval == (CORE_ADDR) -1) |
| 2353 | error (_("Failed inferior mmap call for %s bytes, errno is changed."), |
| 2354 | pulongest (size)); |
| 2355 | return retval; |
| 2356 | } |
| 2357 | |
| 2358 | /* See gdbarch.sh 'infcall_munmap'. */ |
| 2359 | |
| 2360 | static void |
| 2361 | linux_infcall_munmap (CORE_ADDR addr, CORE_ADDR size) |
| 2362 | { |
| 2363 | struct objfile *objf; |
| 2364 | struct value *munmap_val = find_function_in_inferior ("munmap", &objf); |
| 2365 | struct value *retval_val; |
| 2366 | struct gdbarch *gdbarch = get_objfile_arch (objf); |
| 2367 | LONGEST retval; |
| 2368 | enum |
| 2369 | { |
| 2370 | ARG_ADDR, ARG_LENGTH, ARG_LAST |
| 2371 | }; |
| 2372 | struct value *arg[ARG_LAST]; |
| 2373 | |
| 2374 | arg[ARG_ADDR] = value_from_pointer (builtin_type (gdbarch)->builtin_data_ptr, |
| 2375 | addr); |
| 2376 | /* Assuming sizeof (unsigned long) == sizeof (size_t). */ |
| 2377 | arg[ARG_LENGTH] = value_from_ulongest |
| 2378 | (builtin_type (gdbarch)->builtin_unsigned_long, size); |
| 2379 | retval_val = call_function_by_hand (munmap_val, NULL, arg); |
| 2380 | retval = value_as_long (retval_val); |
| 2381 | if (retval != 0) |
| 2382 | warning (_("Failed inferior munmap call at %s for %s bytes, " |
| 2383 | "errno is changed."), |
| 2384 | hex_string (addr), pulongest (size)); |
| 2385 | } |
| 2386 | |
| 2387 | /* See linux-tdep.h. */ |
| 2388 | |
| 2389 | CORE_ADDR |
| 2390 | linux_displaced_step_location (struct gdbarch *gdbarch) |
| 2391 | { |
| 2392 | CORE_ADDR addr; |
| 2393 | int bp_len; |
| 2394 | |
| 2395 | /* Determine entry point from target auxiliary vector. This avoids |
| 2396 | the need for symbols. Also, when debugging a stand-alone SPU |
| 2397 | executable, entry_point_address () will point to an SPU |
| 2398 | local-store address and is thus not usable as displaced stepping |
| 2399 | location. The auxiliary vector gets us the PowerPC-side entry |
| 2400 | point address instead. */ |
| 2401 | if (target_auxv_search (current_top_target (), AT_ENTRY, &addr) <= 0) |
| 2402 | throw_error (NOT_SUPPORTED_ERROR, |
| 2403 | _("Cannot find AT_ENTRY auxiliary vector entry.")); |
| 2404 | |
| 2405 | /* Make certain that the address points at real code, and not a |
| 2406 | function descriptor. */ |
| 2407 | addr = gdbarch_convert_from_func_ptr_addr (gdbarch, addr, |
| 2408 | current_top_target ()); |
| 2409 | |
| 2410 | /* Inferior calls also use the entry point as a breakpoint location. |
| 2411 | We don't want displaced stepping to interfere with those |
| 2412 | breakpoints, so leave space. */ |
| 2413 | gdbarch_breakpoint_from_pc (gdbarch, &addr, &bp_len); |
| 2414 | addr += bp_len * 2; |
| 2415 | |
| 2416 | return addr; |
| 2417 | } |
| 2418 | |
| 2419 | /* See linux-tdep.h. */ |
| 2420 | |
| 2421 | CORE_ADDR |
| 2422 | linux_get_hwcap (struct target_ops *target) |
| 2423 | { |
| 2424 | CORE_ADDR field; |
| 2425 | if (target_auxv_search (target, AT_HWCAP, &field) != 1) |
| 2426 | return 0; |
| 2427 | return field; |
| 2428 | } |
| 2429 | |
| 2430 | /* See linux-tdep.h. */ |
| 2431 | |
| 2432 | CORE_ADDR |
| 2433 | linux_get_hwcap2 (struct target_ops *target) |
| 2434 | { |
| 2435 | CORE_ADDR field; |
| 2436 | if (target_auxv_search (target, AT_HWCAP2, &field) != 1) |
| 2437 | return 0; |
| 2438 | return field; |
| 2439 | } |
| 2440 | |
| 2441 | /* Display whether the gcore command is using the |
| 2442 | /proc/PID/coredump_filter file. */ |
| 2443 | |
| 2444 | static void |
| 2445 | show_use_coredump_filter (struct ui_file *file, int from_tty, |
| 2446 | struct cmd_list_element *c, const char *value) |
| 2447 | { |
| 2448 | fprintf_filtered (file, _("Use of /proc/PID/coredump_filter file to generate" |
| 2449 | " corefiles is %s.\n"), value); |
| 2450 | } |
| 2451 | |
| 2452 | /* Display whether the gcore command is dumping mappings marked with |
| 2453 | the VM_DONTDUMP flag. */ |
| 2454 | |
| 2455 | static void |
| 2456 | show_dump_excluded_mappings (struct ui_file *file, int from_tty, |
| 2457 | struct cmd_list_element *c, const char *value) |
| 2458 | { |
| 2459 | fprintf_filtered (file, _("Dumping of mappings marked with the VM_DONTDUMP" |
| 2460 | " flag is %s.\n"), value); |
| 2461 | } |
| 2462 | |
| 2463 | /* To be called from the various GDB_OSABI_LINUX handlers for the |
| 2464 | various GNU/Linux architectures and machine types. */ |
| 2465 | |
| 2466 | void |
| 2467 | linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 2468 | { |
| 2469 | set_gdbarch_core_pid_to_str (gdbarch, linux_core_pid_to_str); |
| 2470 | set_gdbarch_info_proc (gdbarch, linux_info_proc); |
| 2471 | set_gdbarch_core_info_proc (gdbarch, linux_core_info_proc); |
| 2472 | set_gdbarch_core_xfer_siginfo (gdbarch, linux_core_xfer_siginfo); |
| 2473 | set_gdbarch_find_memory_regions (gdbarch, linux_find_memory_regions); |
| 2474 | set_gdbarch_make_corefile_notes (gdbarch, linux_make_corefile_notes); |
| 2475 | set_gdbarch_has_shared_address_space (gdbarch, |
| 2476 | linux_has_shared_address_space); |
| 2477 | set_gdbarch_gdb_signal_from_target (gdbarch, |
| 2478 | linux_gdb_signal_from_target); |
| 2479 | set_gdbarch_gdb_signal_to_target (gdbarch, |
| 2480 | linux_gdb_signal_to_target); |
| 2481 | set_gdbarch_vsyscall_range (gdbarch, linux_vsyscall_range); |
| 2482 | set_gdbarch_infcall_mmap (gdbarch, linux_infcall_mmap); |
| 2483 | set_gdbarch_infcall_munmap (gdbarch, linux_infcall_munmap); |
| 2484 | set_gdbarch_get_siginfo_type (gdbarch, linux_get_siginfo_type); |
| 2485 | } |
| 2486 | |
| 2487 | void |
| 2488 | _initialize_linux_tdep (void) |
| 2489 | { |
| 2490 | linux_gdbarch_data_handle = |
| 2491 | gdbarch_data_register_post_init (init_linux_gdbarch_data); |
| 2492 | |
| 2493 | /* Observers used to invalidate the cache when needed. */ |
| 2494 | gdb::observers::inferior_exit.attach (invalidate_linux_cache_inf); |
| 2495 | gdb::observers::inferior_appeared.attach (invalidate_linux_cache_inf); |
| 2496 | |
| 2497 | add_setshow_boolean_cmd ("use-coredump-filter", class_files, |
| 2498 | &use_coredump_filter, _("\ |
| 2499 | Set whether gcore should consider /proc/PID/coredump_filter."), |
| 2500 | _("\ |
| 2501 | Show whether gcore should consider /proc/PID/coredump_filter."), |
| 2502 | _("\ |
| 2503 | Use this command to set whether gcore should consider the contents\n\ |
| 2504 | of /proc/PID/coredump_filter when generating the corefile. For more information\n\ |
| 2505 | about this file, refer to the manpage of core(5)."), |
| 2506 | NULL, show_use_coredump_filter, |
| 2507 | &setlist, &showlist); |
| 2508 | |
| 2509 | add_setshow_boolean_cmd ("dump-excluded-mappings", class_files, |
| 2510 | &dump_excluded_mappings, _("\ |
| 2511 | Set whether gcore should dump mappings marked with the VM_DONTDUMP flag."), |
| 2512 | _("\ |
| 2513 | Show whether gcore should dump mappings marked with the VM_DONTDUMP flag."), |
| 2514 | _("\ |
| 2515 | Use this command to set whether gcore should dump mappings marked with the\n\ |
| 2516 | VM_DONTDUMP flag (\"dd\" in /proc/PID/smaps) when generating the corefile. For\n\ |
| 2517 | more information about this file, refer to the manpage of proc(5) and core(5)."), |
| 2518 | NULL, show_dump_excluded_mappings, |
| 2519 | &setlist, &showlist); |
| 2520 | } |