| 1 | /* Core dump and executable file functions below target vector, for GDB. |
| 2 | |
| 3 | Copyright (C) 1986-2013 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 "arch-utils.h" |
| 22 | #include "gdb_string.h" |
| 23 | #include <errno.h> |
| 24 | #include <signal.h> |
| 25 | #include <fcntl.h> |
| 26 | #ifdef HAVE_SYS_FILE_H |
| 27 | #include <sys/file.h> /* needed for F_OK and friends */ |
| 28 | #endif |
| 29 | #include "frame.h" /* required by inferior.h */ |
| 30 | #include "inferior.h" |
| 31 | #include "symtab.h" |
| 32 | #include "command.h" |
| 33 | #include "bfd.h" |
| 34 | #include "target.h" |
| 35 | #include "gdbcore.h" |
| 36 | #include "gdbthread.h" |
| 37 | #include "regcache.h" |
| 38 | #include "regset.h" |
| 39 | #include "symfile.h" |
| 40 | #include "exec.h" |
| 41 | #include "readline/readline.h" |
| 42 | #include "gdb_assert.h" |
| 43 | #include "exceptions.h" |
| 44 | #include "solib.h" |
| 45 | #include "filenames.h" |
| 46 | #include "progspace.h" |
| 47 | #include "objfiles.h" |
| 48 | #include "gdb_bfd.h" |
| 49 | #include "completer.h" |
| 50 | #include "filestuff.h" |
| 51 | |
| 52 | #ifndef O_LARGEFILE |
| 53 | #define O_LARGEFILE 0 |
| 54 | #endif |
| 55 | |
| 56 | /* List of all available core_fns. On gdb startup, each core file |
| 57 | register reader calls deprecated_add_core_fns() to register |
| 58 | information on each core format it is prepared to read. */ |
| 59 | |
| 60 | static struct core_fns *core_file_fns = NULL; |
| 61 | |
| 62 | /* The core_fns for a core file handler that is prepared to read the |
| 63 | core file currently open on core_bfd. */ |
| 64 | |
| 65 | static struct core_fns *core_vec = NULL; |
| 66 | |
| 67 | /* FIXME: kettenis/20031023: Eventually this variable should |
| 68 | disappear. */ |
| 69 | |
| 70 | struct gdbarch *core_gdbarch = NULL; |
| 71 | |
| 72 | /* Per-core data. Currently, only the section table. Note that these |
| 73 | target sections are *not* mapped in the current address spaces' set |
| 74 | of target sections --- those should come only from pure executable |
| 75 | or shared library bfds. The core bfd sections are an |
| 76 | implementation detail of the core target, just like ptrace is for |
| 77 | unix child targets. */ |
| 78 | static struct target_section_table *core_data; |
| 79 | |
| 80 | static void core_files_info (struct target_ops *); |
| 81 | |
| 82 | static struct core_fns *sniff_core_bfd (bfd *); |
| 83 | |
| 84 | static int gdb_check_format (bfd *); |
| 85 | |
| 86 | static void core_open (char *, int); |
| 87 | |
| 88 | static void core_detach (struct target_ops *ops, char *, int); |
| 89 | |
| 90 | static void core_close (void); |
| 91 | |
| 92 | static void core_close_cleanup (void *ignore); |
| 93 | |
| 94 | static void add_to_thread_list (bfd *, asection *, void *); |
| 95 | |
| 96 | static void init_core_ops (void); |
| 97 | |
| 98 | void _initialize_corelow (void); |
| 99 | |
| 100 | static struct target_ops core_ops; |
| 101 | |
| 102 | /* An arbitrary identifier for the core inferior. */ |
| 103 | #define CORELOW_PID 1 |
| 104 | |
| 105 | /* Link a new core_fns into the global core_file_fns list. Called on |
| 106 | gdb startup by the _initialize routine in each core file register |
| 107 | reader, to register information about each format the reader is |
| 108 | prepared to handle. */ |
| 109 | |
| 110 | void |
| 111 | deprecated_add_core_fns (struct core_fns *cf) |
| 112 | { |
| 113 | cf->next = core_file_fns; |
| 114 | core_file_fns = cf; |
| 115 | } |
| 116 | |
| 117 | /* The default function that core file handlers can use to examine a |
| 118 | core file BFD and decide whether or not to accept the job of |
| 119 | reading the core file. */ |
| 120 | |
| 121 | int |
| 122 | default_core_sniffer (struct core_fns *our_fns, bfd *abfd) |
| 123 | { |
| 124 | int result; |
| 125 | |
| 126 | result = (bfd_get_flavour (abfd) == our_fns -> core_flavour); |
| 127 | return (result); |
| 128 | } |
| 129 | |
| 130 | /* Walk through the list of core functions to find a set that can |
| 131 | handle the core file open on ABFD. Returns pointer to set that is |
| 132 | selected. */ |
| 133 | |
| 134 | static struct core_fns * |
| 135 | sniff_core_bfd (bfd *abfd) |
| 136 | { |
| 137 | struct core_fns *cf; |
| 138 | struct core_fns *yummy = NULL; |
| 139 | int matches = 0;; |
| 140 | |
| 141 | /* Don't sniff if we have support for register sets in |
| 142 | CORE_GDBARCH. */ |
| 143 | if (core_gdbarch && gdbarch_regset_from_core_section_p (core_gdbarch)) |
| 144 | return NULL; |
| 145 | |
| 146 | for (cf = core_file_fns; cf != NULL; cf = cf->next) |
| 147 | { |
| 148 | if (cf->core_sniffer (cf, abfd)) |
| 149 | { |
| 150 | yummy = cf; |
| 151 | matches++; |
| 152 | } |
| 153 | } |
| 154 | if (matches > 1) |
| 155 | { |
| 156 | warning (_("\"%s\": ambiguous core format, %d handlers match"), |
| 157 | bfd_get_filename (abfd), matches); |
| 158 | } |
| 159 | else if (matches == 0) |
| 160 | error (_("\"%s\": no core file handler recognizes format"), |
| 161 | bfd_get_filename (abfd)); |
| 162 | |
| 163 | return (yummy); |
| 164 | } |
| 165 | |
| 166 | /* The default is to reject every core file format we see. Either |
| 167 | BFD has to recognize it, or we have to provide a function in the |
| 168 | core file handler that recognizes it. */ |
| 169 | |
| 170 | int |
| 171 | default_check_format (bfd *abfd) |
| 172 | { |
| 173 | return (0); |
| 174 | } |
| 175 | |
| 176 | /* Attempt to recognize core file formats that BFD rejects. */ |
| 177 | |
| 178 | static int |
| 179 | gdb_check_format (bfd *abfd) |
| 180 | { |
| 181 | struct core_fns *cf; |
| 182 | |
| 183 | for (cf = core_file_fns; cf != NULL; cf = cf->next) |
| 184 | { |
| 185 | if (cf->check_format (abfd)) |
| 186 | { |
| 187 | return (1); |
| 188 | } |
| 189 | } |
| 190 | return (0); |
| 191 | } |
| 192 | |
| 193 | /* Discard all vestiges of any previous core file and mark data and |
| 194 | stack spaces as empty. */ |
| 195 | |
| 196 | static void |
| 197 | core_close (void) |
| 198 | { |
| 199 | if (core_bfd) |
| 200 | { |
| 201 | int pid = ptid_get_pid (inferior_ptid); |
| 202 | inferior_ptid = null_ptid; /* Avoid confusion from thread |
| 203 | stuff. */ |
| 204 | if (pid != 0) |
| 205 | exit_inferior_silent (pid); |
| 206 | |
| 207 | /* Clear out solib state while the bfd is still open. See |
| 208 | comments in clear_solib in solib.c. */ |
| 209 | clear_solib (); |
| 210 | |
| 211 | if (core_data) |
| 212 | { |
| 213 | xfree (core_data->sections); |
| 214 | xfree (core_data); |
| 215 | core_data = NULL; |
| 216 | } |
| 217 | |
| 218 | gdb_bfd_unref (core_bfd); |
| 219 | core_bfd = NULL; |
| 220 | } |
| 221 | core_vec = NULL; |
| 222 | core_gdbarch = NULL; |
| 223 | } |
| 224 | |
| 225 | static void |
| 226 | core_close_cleanup (void *ignore) |
| 227 | { |
| 228 | core_close (); |
| 229 | } |
| 230 | |
| 231 | /* Look for sections whose names start with `.reg/' so that we can |
| 232 | extract the list of threads in a core file. */ |
| 233 | |
| 234 | static void |
| 235 | add_to_thread_list (bfd *abfd, asection *asect, void *reg_sect_arg) |
| 236 | { |
| 237 | ptid_t ptid; |
| 238 | int core_tid; |
| 239 | int pid, lwpid; |
| 240 | asection *reg_sect = (asection *) reg_sect_arg; |
| 241 | int fake_pid_p = 0; |
| 242 | struct inferior *inf; |
| 243 | |
| 244 | if (strncmp (bfd_section_name (abfd, asect), ".reg/", 5) != 0) |
| 245 | return; |
| 246 | |
| 247 | core_tid = atoi (bfd_section_name (abfd, asect) + 5); |
| 248 | |
| 249 | pid = bfd_core_file_pid (core_bfd); |
| 250 | if (pid == 0) |
| 251 | { |
| 252 | fake_pid_p = 1; |
| 253 | pid = CORELOW_PID; |
| 254 | } |
| 255 | |
| 256 | lwpid = core_tid; |
| 257 | |
| 258 | inf = current_inferior (); |
| 259 | if (inf->pid == 0) |
| 260 | { |
| 261 | inferior_appeared (inf, pid); |
| 262 | inf->fake_pid_p = fake_pid_p; |
| 263 | } |
| 264 | |
| 265 | ptid = ptid_build (pid, lwpid, 0); |
| 266 | |
| 267 | add_thread (ptid); |
| 268 | |
| 269 | /* Warning, Will Robinson, looking at BFD private data! */ |
| 270 | |
| 271 | if (reg_sect != NULL |
| 272 | && asect->filepos == reg_sect->filepos) /* Did we find .reg? */ |
| 273 | inferior_ptid = ptid; /* Yes, make it current. */ |
| 274 | } |
| 275 | |
| 276 | /* This routine opens and sets up the core file bfd. */ |
| 277 | |
| 278 | static void |
| 279 | core_open (char *filename, int from_tty) |
| 280 | { |
| 281 | const char *p; |
| 282 | int siggy; |
| 283 | struct cleanup *old_chain; |
| 284 | char *temp; |
| 285 | bfd *temp_bfd; |
| 286 | int scratch_chan; |
| 287 | int flags; |
| 288 | volatile struct gdb_exception except; |
| 289 | |
| 290 | target_preopen (from_tty); |
| 291 | if (!filename) |
| 292 | { |
| 293 | if (core_bfd) |
| 294 | error (_("No core file specified. (Use `detach' " |
| 295 | "to stop debugging a core file.)")); |
| 296 | else |
| 297 | error (_("No core file specified.")); |
| 298 | } |
| 299 | |
| 300 | filename = tilde_expand (filename); |
| 301 | if (!IS_ABSOLUTE_PATH (filename)) |
| 302 | { |
| 303 | temp = concat (current_directory, "/", |
| 304 | filename, (char *) NULL); |
| 305 | xfree (filename); |
| 306 | filename = temp; |
| 307 | } |
| 308 | |
| 309 | old_chain = make_cleanup (xfree, filename); |
| 310 | |
| 311 | flags = O_BINARY | O_LARGEFILE; |
| 312 | if (write_files) |
| 313 | flags |= O_RDWR; |
| 314 | else |
| 315 | flags |= O_RDONLY; |
| 316 | scratch_chan = gdb_open_cloexec (filename, flags, 0); |
| 317 | if (scratch_chan < 0) |
| 318 | perror_with_name (filename); |
| 319 | |
| 320 | temp_bfd = gdb_bfd_fopen (filename, gnutarget, |
| 321 | write_files ? FOPEN_RUB : FOPEN_RB, |
| 322 | scratch_chan); |
| 323 | if (temp_bfd == NULL) |
| 324 | perror_with_name (filename); |
| 325 | |
| 326 | if (!bfd_check_format (temp_bfd, bfd_core) |
| 327 | && !gdb_check_format (temp_bfd)) |
| 328 | { |
| 329 | /* Do it after the err msg */ |
| 330 | /* FIXME: should be checking for errors from bfd_close (for one |
| 331 | thing, on error it does not free all the storage associated |
| 332 | with the bfd). */ |
| 333 | make_cleanup_bfd_unref (temp_bfd); |
| 334 | error (_("\"%s\" is not a core dump: %s"), |
| 335 | filename, bfd_errmsg (bfd_get_error ())); |
| 336 | } |
| 337 | |
| 338 | /* Looks semi-reasonable. Toss the old core file and work on the |
| 339 | new. */ |
| 340 | |
| 341 | do_cleanups (old_chain); |
| 342 | unpush_target (&core_ops); |
| 343 | core_bfd = temp_bfd; |
| 344 | old_chain = make_cleanup (core_close_cleanup, 0 /*ignore*/); |
| 345 | |
| 346 | core_gdbarch = gdbarch_from_bfd (core_bfd); |
| 347 | |
| 348 | /* Find a suitable core file handler to munch on core_bfd */ |
| 349 | core_vec = sniff_core_bfd (core_bfd); |
| 350 | |
| 351 | validate_files (); |
| 352 | |
| 353 | core_data = XZALLOC (struct target_section_table); |
| 354 | |
| 355 | /* Find the data section */ |
| 356 | if (build_section_table (core_bfd, |
| 357 | &core_data->sections, |
| 358 | &core_data->sections_end)) |
| 359 | error (_("\"%s\": Can't find sections: %s"), |
| 360 | bfd_get_filename (core_bfd), bfd_errmsg (bfd_get_error ())); |
| 361 | |
| 362 | /* If we have no exec file, try to set the architecture from the |
| 363 | core file. We don't do this unconditionally since an exec file |
| 364 | typically contains more information that helps us determine the |
| 365 | architecture than a core file. */ |
| 366 | if (!exec_bfd) |
| 367 | set_gdbarch_from_file (core_bfd); |
| 368 | |
| 369 | push_target (&core_ops); |
| 370 | discard_cleanups (old_chain); |
| 371 | |
| 372 | /* Do this before acknowledging the inferior, so if |
| 373 | post_create_inferior throws (can happen easilly if you're loading |
| 374 | a core file with the wrong exec), we aren't left with threads |
| 375 | from the previous inferior. */ |
| 376 | init_thread_list (); |
| 377 | |
| 378 | inferior_ptid = null_ptid; |
| 379 | |
| 380 | /* Need to flush the register cache (and the frame cache) from a |
| 381 | previous debug session. If inferior_ptid ends up the same as the |
| 382 | last debug session --- e.g., b foo; run; gcore core1; step; gcore |
| 383 | core2; core core1; core core2 --- then there's potential for |
| 384 | get_current_regcache to return the cached regcache of the |
| 385 | previous session, and the frame cache being stale. */ |
| 386 | registers_changed (); |
| 387 | |
| 388 | /* Build up thread list from BFD sections, and possibly set the |
| 389 | current thread to the .reg/NN section matching the .reg |
| 390 | section. */ |
| 391 | bfd_map_over_sections (core_bfd, add_to_thread_list, |
| 392 | bfd_get_section_by_name (core_bfd, ".reg")); |
| 393 | |
| 394 | if (ptid_equal (inferior_ptid, null_ptid)) |
| 395 | { |
| 396 | /* Either we found no .reg/NN section, and hence we have a |
| 397 | non-threaded core (single-threaded, from gdb's perspective), |
| 398 | or for some reason add_to_thread_list couldn't determine |
| 399 | which was the "main" thread. The latter case shouldn't |
| 400 | usually happen, but we're dealing with input here, which can |
| 401 | always be broken in different ways. */ |
| 402 | struct thread_info *thread = first_thread_of_process (-1); |
| 403 | |
| 404 | if (thread == NULL) |
| 405 | { |
| 406 | inferior_appeared (current_inferior (), CORELOW_PID); |
| 407 | inferior_ptid = pid_to_ptid (CORELOW_PID); |
| 408 | add_thread_silent (inferior_ptid); |
| 409 | } |
| 410 | else |
| 411 | switch_to_thread (thread->ptid); |
| 412 | } |
| 413 | |
| 414 | post_create_inferior (&core_ops, from_tty); |
| 415 | |
| 416 | /* Now go through the target stack looking for threads since there |
| 417 | may be a thread_stratum target loaded on top of target core by |
| 418 | now. The layer above should claim threads found in the BFD |
| 419 | sections. */ |
| 420 | TRY_CATCH (except, RETURN_MASK_ERROR) |
| 421 | { |
| 422 | target_find_new_threads (); |
| 423 | } |
| 424 | |
| 425 | if (except.reason < 0) |
| 426 | exception_print (gdb_stderr, except); |
| 427 | |
| 428 | p = bfd_core_file_failing_command (core_bfd); |
| 429 | if (p) |
| 430 | printf_filtered (_("Core was generated by `%s'.\n"), p); |
| 431 | |
| 432 | siggy = bfd_core_file_failing_signal (core_bfd); |
| 433 | if (siggy > 0) |
| 434 | { |
| 435 | /* If we don't have a CORE_GDBARCH to work with, assume a native |
| 436 | core (map gdb_signal from host signals). If we do have |
| 437 | CORE_GDBARCH to work with, but no gdb_signal_from_target |
| 438 | implementation for that gdbarch, as a fallback measure, |
| 439 | assume the host signal mapping. It'll be correct for native |
| 440 | cores, but most likely incorrect for cross-cores. */ |
| 441 | enum gdb_signal sig = (core_gdbarch != NULL |
| 442 | && gdbarch_gdb_signal_from_target_p (core_gdbarch) |
| 443 | ? gdbarch_gdb_signal_from_target (core_gdbarch, |
| 444 | siggy) |
| 445 | : gdb_signal_from_host (siggy)); |
| 446 | |
| 447 | printf_filtered (_("Program terminated with signal %d, %s.\n"), |
| 448 | siggy, gdb_signal_to_string (sig)); |
| 449 | } |
| 450 | |
| 451 | /* Fetch all registers from core file. */ |
| 452 | target_fetch_registers (get_current_regcache (), -1); |
| 453 | |
| 454 | /* Now, set up the frame cache, and print the top of stack. */ |
| 455 | reinit_frame_cache (); |
| 456 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC); |
| 457 | } |
| 458 | |
| 459 | static void |
| 460 | core_detach (struct target_ops *ops, char *args, int from_tty) |
| 461 | { |
| 462 | if (args) |
| 463 | error (_("Too many arguments")); |
| 464 | unpush_target (ops); |
| 465 | reinit_frame_cache (); |
| 466 | if (from_tty) |
| 467 | printf_filtered (_("No core file now.\n")); |
| 468 | } |
| 469 | |
| 470 | /* Try to retrieve registers from a section in core_bfd, and supply |
| 471 | them to core_vec->core_read_registers, as the register set numbered |
| 472 | WHICH. |
| 473 | |
| 474 | If inferior_ptid's lwp member is zero, do the single-threaded |
| 475 | thing: look for a section named NAME. If inferior_ptid's lwp |
| 476 | member is non-zero, do the multi-threaded thing: look for a section |
| 477 | named "NAME/LWP", where LWP is the shortest ASCII decimal |
| 478 | representation of inferior_ptid's lwp member. |
| 479 | |
| 480 | HUMAN_NAME is a human-readable name for the kind of registers the |
| 481 | NAME section contains, for use in error messages. |
| 482 | |
| 483 | If REQUIRED is non-zero, print an error if the core file doesn't |
| 484 | have a section by the appropriate name. Otherwise, just do |
| 485 | nothing. */ |
| 486 | |
| 487 | static void |
| 488 | get_core_register_section (struct regcache *regcache, |
| 489 | const char *name, |
| 490 | int which, |
| 491 | const char *human_name, |
| 492 | int required) |
| 493 | { |
| 494 | static char *section_name = NULL; |
| 495 | struct bfd_section *section; |
| 496 | bfd_size_type size; |
| 497 | char *contents; |
| 498 | |
| 499 | xfree (section_name); |
| 500 | |
| 501 | if (ptid_get_lwp (inferior_ptid)) |
| 502 | section_name = xstrprintf ("%s/%ld", name, |
| 503 | ptid_get_lwp (inferior_ptid)); |
| 504 | else |
| 505 | section_name = xstrdup (name); |
| 506 | |
| 507 | section = bfd_get_section_by_name (core_bfd, section_name); |
| 508 | if (! section) |
| 509 | { |
| 510 | if (required) |
| 511 | warning (_("Couldn't find %s registers in core file."), |
| 512 | human_name); |
| 513 | return; |
| 514 | } |
| 515 | |
| 516 | size = bfd_section_size (core_bfd, section); |
| 517 | contents = alloca (size); |
| 518 | if (! bfd_get_section_contents (core_bfd, section, contents, |
| 519 | (file_ptr) 0, size)) |
| 520 | { |
| 521 | warning (_("Couldn't read %s registers from `%s' section in core file."), |
| 522 | human_name, name); |
| 523 | return; |
| 524 | } |
| 525 | |
| 526 | if (core_gdbarch && gdbarch_regset_from_core_section_p (core_gdbarch)) |
| 527 | { |
| 528 | const struct regset *regset; |
| 529 | |
| 530 | regset = gdbarch_regset_from_core_section (core_gdbarch, |
| 531 | name, size); |
| 532 | if (regset == NULL) |
| 533 | { |
| 534 | if (required) |
| 535 | warning (_("Couldn't recognize %s registers in core file."), |
| 536 | human_name); |
| 537 | return; |
| 538 | } |
| 539 | |
| 540 | regset->supply_regset (regset, regcache, -1, contents, size); |
| 541 | return; |
| 542 | } |
| 543 | |
| 544 | gdb_assert (core_vec); |
| 545 | core_vec->core_read_registers (regcache, contents, size, which, |
| 546 | ((CORE_ADDR) |
| 547 | bfd_section_vma (core_bfd, section))); |
| 548 | } |
| 549 | |
| 550 | |
| 551 | /* Get the registers out of a core file. This is the machine- |
| 552 | independent part. Fetch_core_registers is the machine-dependent |
| 553 | part, typically implemented in the xm-file for each |
| 554 | architecture. */ |
| 555 | |
| 556 | /* We just get all the registers, so we don't use regno. */ |
| 557 | |
| 558 | static void |
| 559 | get_core_registers (struct target_ops *ops, |
| 560 | struct regcache *regcache, int regno) |
| 561 | { |
| 562 | struct core_regset_section *sect_list; |
| 563 | int i; |
| 564 | |
| 565 | if (!(core_gdbarch && gdbarch_regset_from_core_section_p (core_gdbarch)) |
| 566 | && (core_vec == NULL || core_vec->core_read_registers == NULL)) |
| 567 | { |
| 568 | fprintf_filtered (gdb_stderr, |
| 569 | "Can't fetch registers from this type of core file\n"); |
| 570 | return; |
| 571 | } |
| 572 | |
| 573 | sect_list = gdbarch_core_regset_sections (get_regcache_arch (regcache)); |
| 574 | if (sect_list) |
| 575 | while (sect_list->sect_name != NULL) |
| 576 | { |
| 577 | if (strcmp (sect_list->sect_name, ".reg") == 0) |
| 578 | get_core_register_section (regcache, sect_list->sect_name, |
| 579 | 0, sect_list->human_name, 1); |
| 580 | else if (strcmp (sect_list->sect_name, ".reg2") == 0) |
| 581 | get_core_register_section (regcache, sect_list->sect_name, |
| 582 | 2, sect_list->human_name, 0); |
| 583 | else |
| 584 | get_core_register_section (regcache, sect_list->sect_name, |
| 585 | 3, sect_list->human_name, 0); |
| 586 | |
| 587 | sect_list++; |
| 588 | } |
| 589 | |
| 590 | else |
| 591 | { |
| 592 | get_core_register_section (regcache, |
| 593 | ".reg", 0, "general-purpose", 1); |
| 594 | get_core_register_section (regcache, |
| 595 | ".reg2", 2, "floating-point", 0); |
| 596 | } |
| 597 | |
| 598 | /* Mark all registers not found in the core as unavailable. */ |
| 599 | for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) |
| 600 | if (regcache_register_status (regcache, i) == REG_UNKNOWN) |
| 601 | regcache_raw_supply (regcache, i, NULL); |
| 602 | } |
| 603 | |
| 604 | static void |
| 605 | core_files_info (struct target_ops *t) |
| 606 | { |
| 607 | print_section_info (core_data, core_bfd); |
| 608 | } |
| 609 | \f |
| 610 | struct spuid_list |
| 611 | { |
| 612 | gdb_byte *buf; |
| 613 | ULONGEST offset; |
| 614 | LONGEST len; |
| 615 | ULONGEST pos; |
| 616 | ULONGEST written; |
| 617 | }; |
| 618 | |
| 619 | static void |
| 620 | add_to_spuid_list (bfd *abfd, asection *asect, void *list_p) |
| 621 | { |
| 622 | struct spuid_list *list = list_p; |
| 623 | enum bfd_endian byte_order |
| 624 | = bfd_big_endian (abfd) ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE; |
| 625 | int fd, pos = 0; |
| 626 | |
| 627 | sscanf (bfd_section_name (abfd, asect), "SPU/%d/regs%n", &fd, &pos); |
| 628 | if (pos == 0) |
| 629 | return; |
| 630 | |
| 631 | if (list->pos >= list->offset && list->pos + 4 <= list->offset + list->len) |
| 632 | { |
| 633 | store_unsigned_integer (list->buf + list->pos - list->offset, |
| 634 | 4, byte_order, fd); |
| 635 | list->written += 4; |
| 636 | } |
| 637 | list->pos += 4; |
| 638 | } |
| 639 | |
| 640 | /* Read siginfo data from the core, if possible. Returns -1 on |
| 641 | failure. Otherwise, returns the number of bytes read. ABFD is the |
| 642 | core file's BFD; READBUF, OFFSET, and LEN are all as specified by |
| 643 | the to_xfer_partial interface. */ |
| 644 | |
| 645 | static LONGEST |
| 646 | get_core_siginfo (bfd *abfd, gdb_byte *readbuf, ULONGEST offset, LONGEST len) |
| 647 | { |
| 648 | asection *section; |
| 649 | char *section_name; |
| 650 | const char *name = ".note.linuxcore.siginfo"; |
| 651 | |
| 652 | if (ptid_get_lwp (inferior_ptid)) |
| 653 | section_name = xstrprintf ("%s/%ld", name, |
| 654 | ptid_get_lwp (inferior_ptid)); |
| 655 | else |
| 656 | section_name = xstrdup (name); |
| 657 | |
| 658 | section = bfd_get_section_by_name (abfd, section_name); |
| 659 | xfree (section_name); |
| 660 | if (section == NULL) |
| 661 | return -1; |
| 662 | |
| 663 | if (!bfd_get_section_contents (abfd, section, readbuf, offset, len)) |
| 664 | return -1; |
| 665 | |
| 666 | return len; |
| 667 | } |
| 668 | |
| 669 | static LONGEST |
| 670 | core_xfer_partial (struct target_ops *ops, enum target_object object, |
| 671 | const char *annex, gdb_byte *readbuf, |
| 672 | const gdb_byte *writebuf, ULONGEST offset, |
| 673 | LONGEST len) |
| 674 | { |
| 675 | switch (object) |
| 676 | { |
| 677 | case TARGET_OBJECT_MEMORY: |
| 678 | return section_table_xfer_memory_partial (readbuf, writebuf, |
| 679 | offset, len, |
| 680 | core_data->sections, |
| 681 | core_data->sections_end, |
| 682 | NULL); |
| 683 | |
| 684 | case TARGET_OBJECT_AUXV: |
| 685 | if (readbuf) |
| 686 | { |
| 687 | /* When the aux vector is stored in core file, BFD |
| 688 | represents this with a fake section called ".auxv". */ |
| 689 | |
| 690 | struct bfd_section *section; |
| 691 | bfd_size_type size; |
| 692 | |
| 693 | section = bfd_get_section_by_name (core_bfd, ".auxv"); |
| 694 | if (section == NULL) |
| 695 | return -1; |
| 696 | |
| 697 | size = bfd_section_size (core_bfd, section); |
| 698 | if (offset >= size) |
| 699 | return 0; |
| 700 | size -= offset; |
| 701 | if (size > len) |
| 702 | size = len; |
| 703 | if (size > 0 |
| 704 | && !bfd_get_section_contents (core_bfd, section, readbuf, |
| 705 | (file_ptr) offset, size)) |
| 706 | { |
| 707 | warning (_("Couldn't read NT_AUXV note in core file.")); |
| 708 | return -1; |
| 709 | } |
| 710 | |
| 711 | return size; |
| 712 | } |
| 713 | return -1; |
| 714 | |
| 715 | case TARGET_OBJECT_WCOOKIE: |
| 716 | if (readbuf) |
| 717 | { |
| 718 | /* When the StackGhost cookie is stored in core file, BFD |
| 719 | represents this with a fake section called |
| 720 | ".wcookie". */ |
| 721 | |
| 722 | struct bfd_section *section; |
| 723 | bfd_size_type size; |
| 724 | |
| 725 | section = bfd_get_section_by_name (core_bfd, ".wcookie"); |
| 726 | if (section == NULL) |
| 727 | return -1; |
| 728 | |
| 729 | size = bfd_section_size (core_bfd, section); |
| 730 | if (offset >= size) |
| 731 | return 0; |
| 732 | size -= offset; |
| 733 | if (size > len) |
| 734 | size = len; |
| 735 | if (size > 0 |
| 736 | && !bfd_get_section_contents (core_bfd, section, readbuf, |
| 737 | (file_ptr) offset, size)) |
| 738 | { |
| 739 | warning (_("Couldn't read StackGhost cookie in core file.")); |
| 740 | return -1; |
| 741 | } |
| 742 | |
| 743 | return size; |
| 744 | } |
| 745 | return -1; |
| 746 | |
| 747 | case TARGET_OBJECT_LIBRARIES: |
| 748 | if (core_gdbarch |
| 749 | && gdbarch_core_xfer_shared_libraries_p (core_gdbarch)) |
| 750 | { |
| 751 | if (writebuf) |
| 752 | return -1; |
| 753 | return |
| 754 | gdbarch_core_xfer_shared_libraries (core_gdbarch, |
| 755 | readbuf, offset, len); |
| 756 | } |
| 757 | /* FALL THROUGH */ |
| 758 | |
| 759 | case TARGET_OBJECT_SPU: |
| 760 | if (readbuf && annex) |
| 761 | { |
| 762 | /* When the SPU contexts are stored in a core file, BFD |
| 763 | represents this with a fake section called |
| 764 | "SPU/<annex>". */ |
| 765 | |
| 766 | struct bfd_section *section; |
| 767 | bfd_size_type size; |
| 768 | char sectionstr[100]; |
| 769 | |
| 770 | xsnprintf (sectionstr, sizeof sectionstr, "SPU/%s", annex); |
| 771 | |
| 772 | section = bfd_get_section_by_name (core_bfd, sectionstr); |
| 773 | if (section == NULL) |
| 774 | return -1; |
| 775 | |
| 776 | size = bfd_section_size (core_bfd, section); |
| 777 | if (offset >= size) |
| 778 | return 0; |
| 779 | size -= offset; |
| 780 | if (size > len) |
| 781 | size = len; |
| 782 | if (size > 0 |
| 783 | && !bfd_get_section_contents (core_bfd, section, readbuf, |
| 784 | (file_ptr) offset, size)) |
| 785 | { |
| 786 | warning (_("Couldn't read SPU section in core file.")); |
| 787 | return -1; |
| 788 | } |
| 789 | |
| 790 | return size; |
| 791 | } |
| 792 | else if (readbuf) |
| 793 | { |
| 794 | /* NULL annex requests list of all present spuids. */ |
| 795 | struct spuid_list list; |
| 796 | |
| 797 | list.buf = readbuf; |
| 798 | list.offset = offset; |
| 799 | list.len = len; |
| 800 | list.pos = 0; |
| 801 | list.written = 0; |
| 802 | bfd_map_over_sections (core_bfd, add_to_spuid_list, &list); |
| 803 | return list.written; |
| 804 | } |
| 805 | return -1; |
| 806 | |
| 807 | case TARGET_OBJECT_SIGNAL_INFO: |
| 808 | if (readbuf) |
| 809 | return get_core_siginfo (core_bfd, readbuf, offset, len); |
| 810 | return -1; |
| 811 | |
| 812 | default: |
| 813 | if (ops->beneath != NULL) |
| 814 | return ops->beneath->to_xfer_partial (ops->beneath, object, |
| 815 | annex, readbuf, |
| 816 | writebuf, offset, len); |
| 817 | return -1; |
| 818 | } |
| 819 | } |
| 820 | |
| 821 | \f |
| 822 | /* If mourn is being called in all the right places, this could be say |
| 823 | `gdb internal error' (since generic_mourn calls |
| 824 | breakpoint_init_inferior). */ |
| 825 | |
| 826 | static int |
| 827 | ignore (struct gdbarch *gdbarch, struct bp_target_info *bp_tgt) |
| 828 | { |
| 829 | return 0; |
| 830 | } |
| 831 | |
| 832 | |
| 833 | /* Okay, let's be honest: threads gleaned from a core file aren't |
| 834 | exactly lively, are they? On the other hand, if we don't claim |
| 835 | that each & every one is alive, then we don't get any of them |
| 836 | to appear in an "info thread" command, which is quite a useful |
| 837 | behaviour. |
| 838 | */ |
| 839 | static int |
| 840 | core_thread_alive (struct target_ops *ops, ptid_t ptid) |
| 841 | { |
| 842 | return 1; |
| 843 | } |
| 844 | |
| 845 | /* Ask the current architecture what it knows about this core file. |
| 846 | That will be used, in turn, to pick a better architecture. This |
| 847 | wrapper could be avoided if targets got a chance to specialize |
| 848 | core_ops. */ |
| 849 | |
| 850 | static const struct target_desc * |
| 851 | core_read_description (struct target_ops *target) |
| 852 | { |
| 853 | if (core_gdbarch && gdbarch_core_read_description_p (core_gdbarch)) |
| 854 | return gdbarch_core_read_description (core_gdbarch, |
| 855 | target, core_bfd); |
| 856 | |
| 857 | return NULL; |
| 858 | } |
| 859 | |
| 860 | static char * |
| 861 | core_pid_to_str (struct target_ops *ops, ptid_t ptid) |
| 862 | { |
| 863 | static char buf[64]; |
| 864 | struct inferior *inf; |
| 865 | int pid; |
| 866 | |
| 867 | /* The preferred way is to have a gdbarch/OS specific |
| 868 | implementation. */ |
| 869 | if (core_gdbarch |
| 870 | && gdbarch_core_pid_to_str_p (core_gdbarch)) |
| 871 | return gdbarch_core_pid_to_str (core_gdbarch, ptid); |
| 872 | |
| 873 | /* Otherwise, if we don't have one, we'll just fallback to |
| 874 | "process", with normal_pid_to_str. */ |
| 875 | |
| 876 | /* Try the LWPID field first. */ |
| 877 | pid = ptid_get_lwp (ptid); |
| 878 | if (pid != 0) |
| 879 | return normal_pid_to_str (pid_to_ptid (pid)); |
| 880 | |
| 881 | /* Otherwise, this isn't a "threaded" core -- use the PID field, but |
| 882 | only if it isn't a fake PID. */ |
| 883 | inf = find_inferior_pid (ptid_get_pid (ptid)); |
| 884 | if (inf != NULL && !inf->fake_pid_p) |
| 885 | return normal_pid_to_str (ptid); |
| 886 | |
| 887 | /* No luck. We simply don't have a valid PID to print. */ |
| 888 | xsnprintf (buf, sizeof buf, "<main task>"); |
| 889 | return buf; |
| 890 | } |
| 891 | |
| 892 | static int |
| 893 | core_has_memory (struct target_ops *ops) |
| 894 | { |
| 895 | return (core_bfd != NULL); |
| 896 | } |
| 897 | |
| 898 | static int |
| 899 | core_has_stack (struct target_ops *ops) |
| 900 | { |
| 901 | return (core_bfd != NULL); |
| 902 | } |
| 903 | |
| 904 | static int |
| 905 | core_has_registers (struct target_ops *ops) |
| 906 | { |
| 907 | return (core_bfd != NULL); |
| 908 | } |
| 909 | |
| 910 | /* Implement the to_info_proc method. */ |
| 911 | |
| 912 | static void |
| 913 | core_info_proc (struct target_ops *ops, char *args, enum info_proc_what request) |
| 914 | { |
| 915 | struct gdbarch *gdbarch = get_current_arch (); |
| 916 | |
| 917 | /* Since this is the core file target, call the 'core_info_proc' |
| 918 | method on gdbarch, not 'info_proc'. */ |
| 919 | if (gdbarch_core_info_proc_p (gdbarch)) |
| 920 | gdbarch_core_info_proc (gdbarch, args, request); |
| 921 | } |
| 922 | |
| 923 | /* Fill in core_ops with its defined operations and properties. */ |
| 924 | |
| 925 | static void |
| 926 | init_core_ops (void) |
| 927 | { |
| 928 | core_ops.to_shortname = "core"; |
| 929 | core_ops.to_longname = "Local core dump file"; |
| 930 | core_ops.to_doc = |
| 931 | "Use a core file as a target. Specify the filename of the core file."; |
| 932 | core_ops.to_open = core_open; |
| 933 | core_ops.to_close = core_close; |
| 934 | core_ops.to_attach = find_default_attach; |
| 935 | core_ops.to_detach = core_detach; |
| 936 | core_ops.to_fetch_registers = get_core_registers; |
| 937 | core_ops.to_xfer_partial = core_xfer_partial; |
| 938 | core_ops.to_files_info = core_files_info; |
| 939 | core_ops.to_insert_breakpoint = ignore; |
| 940 | core_ops.to_remove_breakpoint = ignore; |
| 941 | core_ops.to_create_inferior = find_default_create_inferior; |
| 942 | core_ops.to_thread_alive = core_thread_alive; |
| 943 | core_ops.to_read_description = core_read_description; |
| 944 | core_ops.to_pid_to_str = core_pid_to_str; |
| 945 | core_ops.to_stratum = process_stratum; |
| 946 | core_ops.to_has_memory = core_has_memory; |
| 947 | core_ops.to_has_stack = core_has_stack; |
| 948 | core_ops.to_has_registers = core_has_registers; |
| 949 | core_ops.to_info_proc = core_info_proc; |
| 950 | core_ops.to_magic = OPS_MAGIC; |
| 951 | |
| 952 | if (core_target) |
| 953 | internal_error (__FILE__, __LINE__, |
| 954 | _("init_core_ops: core target already exists (\"%s\")."), |
| 955 | core_target->to_longname); |
| 956 | core_target = &core_ops; |
| 957 | } |
| 958 | |
| 959 | void |
| 960 | _initialize_corelow (void) |
| 961 | { |
| 962 | init_core_ops (); |
| 963 | |
| 964 | add_target_with_completer (&core_ops, filename_completer); |
| 965 | } |