| 1 | /* Core dump and executable file functions below target vector, for GDB. |
| 2 | |
| 3 | Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, |
| 4 | 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005 |
| 5 | Free Software Foundation, Inc. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 2 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program; if not, write to the Free Software |
| 21 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 22 | Boston, MA 02111-1307, USA. */ |
| 23 | |
| 24 | #include "defs.h" |
| 25 | #include "arch-utils.h" |
| 26 | #include "gdb_string.h" |
| 27 | #include <errno.h> |
| 28 | #include <signal.h> |
| 29 | #include <fcntl.h> |
| 30 | #ifdef HAVE_SYS_FILE_H |
| 31 | #include <sys/file.h> /* needed for F_OK and friends */ |
| 32 | #endif |
| 33 | #include "frame.h" /* required by inferior.h */ |
| 34 | #include "inferior.h" |
| 35 | #include "symtab.h" |
| 36 | #include "command.h" |
| 37 | #include "bfd.h" |
| 38 | #include "target.h" |
| 39 | #include "gdbcore.h" |
| 40 | #include "gdbthread.h" |
| 41 | #include "regcache.h" |
| 42 | #include "regset.h" |
| 43 | #include "symfile.h" |
| 44 | #include "exec.h" |
| 45 | #include "readline/readline.h" |
| 46 | #include "observer.h" |
| 47 | #include "gdb_assert.h" |
| 48 | #include "exceptions.h" |
| 49 | #include "solib.h" |
| 50 | |
| 51 | #ifndef O_BINARY |
| 52 | #define O_BINARY 0 |
| 53 | #endif |
| 54 | |
| 55 | #ifndef O_LARGEFILE |
| 56 | #define O_LARGEFILE 0 |
| 57 | #endif |
| 58 | |
| 59 | /* List of all available core_fns. On gdb startup, each core file |
| 60 | register reader calls deprecated_add_core_fns() to register |
| 61 | information on each core format it is prepared to read. */ |
| 62 | |
| 63 | static struct core_fns *core_file_fns = NULL; |
| 64 | |
| 65 | /* The core_fns for a core file handler that is prepared to read the core |
| 66 | file currently open on core_bfd. */ |
| 67 | |
| 68 | static struct core_fns *core_vec = NULL; |
| 69 | |
| 70 | /* FIXME: kettenis/20031023: Eventually this variable should |
| 71 | disappear. */ |
| 72 | |
| 73 | struct gdbarch *core_gdbarch = NULL; |
| 74 | |
| 75 | static void core_files_info (struct target_ops *); |
| 76 | |
| 77 | static struct core_fns *sniff_core_bfd (bfd *); |
| 78 | |
| 79 | static int gdb_check_format (bfd *); |
| 80 | |
| 81 | static void core_open (char *, int); |
| 82 | |
| 83 | static void core_detach (char *, int); |
| 84 | |
| 85 | static void core_close (int); |
| 86 | |
| 87 | static void core_close_cleanup (void *ignore); |
| 88 | |
| 89 | static void get_core_registers (int); |
| 90 | |
| 91 | static void add_to_thread_list (bfd *, asection *, void *); |
| 92 | |
| 93 | static int ignore (CORE_ADDR, bfd_byte *); |
| 94 | |
| 95 | static int core_file_thread_alive (ptid_t tid); |
| 96 | |
| 97 | static void init_core_ops (void); |
| 98 | |
| 99 | void _initialize_corelow (void); |
| 100 | |
| 101 | struct target_ops core_ops; |
| 102 | |
| 103 | /* Link a new core_fns into the global core_file_fns list. Called on gdb |
| 104 | startup by the _initialize routine in each core file register reader, to |
| 105 | register information about each format the the reader is prepared to |
| 106 | handle. */ |
| 107 | |
| 108 | void |
| 109 | deprecated_add_core_fns (struct core_fns *cf) |
| 110 | { |
| 111 | cf->next = core_file_fns; |
| 112 | core_file_fns = cf; |
| 113 | } |
| 114 | |
| 115 | /* The default function that core file handlers can use to examine a |
| 116 | core file BFD and decide whether or not to accept the job of |
| 117 | reading the core file. */ |
| 118 | |
| 119 | int |
| 120 | default_core_sniffer (struct core_fns *our_fns, bfd *abfd) |
| 121 | { |
| 122 | int result; |
| 123 | |
| 124 | result = (bfd_get_flavour (abfd) == our_fns -> core_flavour); |
| 125 | return (result); |
| 126 | } |
| 127 | |
| 128 | /* Walk through the list of core functions to find a set that can |
| 129 | handle the core file open on ABFD. Default to the first one in the |
| 130 | list if nothing matches. Returns pointer to set that is |
| 131 | selected. */ |
| 132 | |
| 133 | static struct core_fns * |
| 134 | sniff_core_bfd (bfd *abfd) |
| 135 | { |
| 136 | struct core_fns *cf; |
| 137 | struct core_fns *yummy = NULL; |
| 138 | int matches = 0;; |
| 139 | |
| 140 | /* Don't sniff if we have support for register sets in CORE_GDBARCH. */ |
| 141 | if (core_gdbarch && gdbarch_regset_from_core_section_p (core_gdbarch)) |
| 142 | return NULL; |
| 143 | |
| 144 | for (cf = core_file_fns; cf != NULL; cf = cf->next) |
| 145 | { |
| 146 | if (cf->core_sniffer (cf, abfd)) |
| 147 | { |
| 148 | yummy = cf; |
| 149 | matches++; |
| 150 | } |
| 151 | } |
| 152 | if (matches > 1) |
| 153 | { |
| 154 | warning (_("\"%s\": ambiguous core format, %d handlers match"), |
| 155 | bfd_get_filename (abfd), matches); |
| 156 | } |
| 157 | else if (matches == 0) |
| 158 | { |
| 159 | warning (_("\"%s\": no core file handler recognizes format, using default"), |
| 160 | bfd_get_filename (abfd)); |
| 161 | } |
| 162 | if (yummy == NULL) |
| 163 | { |
| 164 | yummy = core_file_fns; |
| 165 | } |
| 166 | return (yummy); |
| 167 | } |
| 168 | |
| 169 | /* The default is to reject every core file format we see. Either |
| 170 | BFD has to recognize it, or we have to provide a function in the |
| 171 | core file handler that recognizes it. */ |
| 172 | |
| 173 | int |
| 174 | default_check_format (bfd *abfd) |
| 175 | { |
| 176 | return (0); |
| 177 | } |
| 178 | |
| 179 | /* Attempt to recognize core file formats that BFD rejects. */ |
| 180 | |
| 181 | static int |
| 182 | gdb_check_format (bfd *abfd) |
| 183 | { |
| 184 | struct core_fns *cf; |
| 185 | |
| 186 | for (cf = core_file_fns; cf != NULL; cf = cf->next) |
| 187 | { |
| 188 | if (cf->check_format (abfd)) |
| 189 | { |
| 190 | return (1); |
| 191 | } |
| 192 | } |
| 193 | return (0); |
| 194 | } |
| 195 | |
| 196 | /* Discard all vestiges of any previous core file and mark data and stack |
| 197 | spaces as empty. */ |
| 198 | |
| 199 | static void |
| 200 | core_close (int quitting) |
| 201 | { |
| 202 | char *name; |
| 203 | |
| 204 | if (core_bfd) |
| 205 | { |
| 206 | inferior_ptid = null_ptid; /* Avoid confusion from thread stuff */ |
| 207 | |
| 208 | /* Clear out solib state while the bfd is still open. See |
| 209 | comments in clear_solib in solib.c. */ |
| 210 | #ifdef CLEAR_SOLIB |
| 211 | CLEAR_SOLIB (); |
| 212 | #else |
| 213 | clear_solib (); |
| 214 | #endif |
| 215 | |
| 216 | name = bfd_get_filename (core_bfd); |
| 217 | if (!bfd_close (core_bfd)) |
| 218 | warning (_("cannot close \"%s\": %s"), |
| 219 | name, bfd_errmsg (bfd_get_error ())); |
| 220 | xfree (name); |
| 221 | core_bfd = NULL; |
| 222 | if (core_ops.to_sections) |
| 223 | { |
| 224 | xfree (core_ops.to_sections); |
| 225 | core_ops.to_sections = NULL; |
| 226 | core_ops.to_sections_end = NULL; |
| 227 | } |
| 228 | } |
| 229 | core_vec = NULL; |
| 230 | core_gdbarch = NULL; |
| 231 | } |
| 232 | |
| 233 | static void |
| 234 | core_close_cleanup (void *ignore) |
| 235 | { |
| 236 | core_close (0/*ignored*/); |
| 237 | } |
| 238 | |
| 239 | /* Stub function for catch_errors around shared library hacking. FROM_TTYP |
| 240 | is really an int * which points to from_tty. */ |
| 241 | |
| 242 | static int |
| 243 | solib_add_stub (void *from_ttyp) |
| 244 | { |
| 245 | #ifdef SOLIB_ADD |
| 246 | SOLIB_ADD (NULL, *(int *) from_ttyp, ¤t_target, auto_solib_add); |
| 247 | #else |
| 248 | solib_add (NULL, *(int *)from_ttyp, ¤t_target, auto_solib_add); |
| 249 | #endif |
| 250 | re_enable_breakpoints_in_shlibs (); |
| 251 | return 0; |
| 252 | } |
| 253 | |
| 254 | /* Look for sections whose names start with `.reg/' so that we can extract the |
| 255 | list of threads in a core file. */ |
| 256 | |
| 257 | static void |
| 258 | add_to_thread_list (bfd *abfd, asection *asect, void *reg_sect_arg) |
| 259 | { |
| 260 | int thread_id; |
| 261 | asection *reg_sect = (asection *) reg_sect_arg; |
| 262 | |
| 263 | if (strncmp (bfd_section_name (abfd, asect), ".reg/", 5) != 0) |
| 264 | return; |
| 265 | |
| 266 | thread_id = atoi (bfd_section_name (abfd, asect) + 5); |
| 267 | |
| 268 | add_thread (pid_to_ptid (thread_id)); |
| 269 | |
| 270 | /* Warning, Will Robinson, looking at BFD private data! */ |
| 271 | |
| 272 | if (reg_sect != NULL |
| 273 | && asect->filepos == reg_sect->filepos) /* Did we find .reg? */ |
| 274 | inferior_ptid = pid_to_ptid (thread_id); /* Yes, make it current */ |
| 275 | } |
| 276 | |
| 277 | /* This routine opens and sets up the core file bfd. */ |
| 278 | |
| 279 | static void |
| 280 | core_open (char *filename, int from_tty) |
| 281 | { |
| 282 | const char *p; |
| 283 | int siggy; |
| 284 | struct cleanup *old_chain; |
| 285 | char *temp; |
| 286 | bfd *temp_bfd; |
| 287 | int ontop; |
| 288 | int scratch_chan; |
| 289 | int flags; |
| 290 | |
| 291 | target_preopen (from_tty); |
| 292 | if (!filename) |
| 293 | { |
| 294 | if (core_bfd) |
| 295 | error (_("No core file specified. (Use `detach' to stop debugging a core file.)")); |
| 296 | else |
| 297 | error (_("No core file specified.")); |
| 298 | } |
| 299 | |
| 300 | filename = tilde_expand (filename); |
| 301 | if (filename[0] != '/') |
| 302 | { |
| 303 | temp = concat (current_directory, "/", filename, NULL); |
| 304 | xfree (filename); |
| 305 | filename = temp; |
| 306 | } |
| 307 | |
| 308 | old_chain = make_cleanup (xfree, filename); |
| 309 | |
| 310 | flags = O_BINARY | O_LARGEFILE; |
| 311 | if (write_files) |
| 312 | flags |= O_RDWR; |
| 313 | else |
| 314 | flags |= O_RDONLY; |
| 315 | scratch_chan = open (filename, flags, 0); |
| 316 | if (scratch_chan < 0) |
| 317 | perror_with_name (filename); |
| 318 | |
| 319 | temp_bfd = bfd_fdopenr (filename, gnutarget, scratch_chan); |
| 320 | if (temp_bfd == NULL) |
| 321 | perror_with_name (filename); |
| 322 | |
| 323 | if (!bfd_check_format (temp_bfd, bfd_core) && |
| 324 | !gdb_check_format (temp_bfd)) |
| 325 | { |
| 326 | /* Do it after the err msg */ |
| 327 | /* FIXME: should be checking for errors from bfd_close (for one thing, |
| 328 | on error it does not free all the storage associated with the |
| 329 | bfd). */ |
| 330 | make_cleanup_bfd_close (temp_bfd); |
| 331 | error (_("\"%s\" is not a core dump: %s"), |
| 332 | filename, bfd_errmsg (bfd_get_error ())); |
| 333 | } |
| 334 | |
| 335 | /* Looks semi-reasonable. Toss the old core file and work on the new. */ |
| 336 | |
| 337 | discard_cleanups (old_chain); /* Don't free filename any more */ |
| 338 | unpush_target (&core_ops); |
| 339 | core_bfd = temp_bfd; |
| 340 | old_chain = make_cleanup (core_close_cleanup, 0 /*ignore*/); |
| 341 | |
| 342 | /* FIXME: kettenis/20031023: This is very dangerous. The |
| 343 | CORE_GDBARCH that results from this call may very well be |
| 344 | different from CURRENT_GDBARCH. However, its methods may only |
| 345 | work if it is selected as the current architecture, because they |
| 346 | rely on swapped data (see gdbarch.c). We should get rid of that |
| 347 | swapped data. */ |
| 348 | core_gdbarch = gdbarch_from_bfd (core_bfd); |
| 349 | |
| 350 | /* Find a suitable core file handler to munch on core_bfd */ |
| 351 | core_vec = sniff_core_bfd (core_bfd); |
| 352 | |
| 353 | validate_files (); |
| 354 | |
| 355 | /* Find the data section */ |
| 356 | if (build_section_table (core_bfd, &core_ops.to_sections, |
| 357 | &core_ops.to_sections_end)) |
| 358 | error (_("\"%s\": Can't find sections: %s"), |
| 359 | bfd_get_filename (core_bfd), bfd_errmsg (bfd_get_error ())); |
| 360 | |
| 361 | /* If we have no exec file, try to set the architecture from the |
| 362 | core file. We don't do this unconditionally since an exec file |
| 363 | typically contains more information that helps us determine the |
| 364 | architecture than a core file. */ |
| 365 | if (!exec_bfd) |
| 366 | set_gdbarch_from_file (core_bfd); |
| 367 | |
| 368 | ontop = !push_target (&core_ops); |
| 369 | discard_cleanups (old_chain); |
| 370 | |
| 371 | /* This is done first, before anything has a chance to query the |
| 372 | inferior for information such as symbols. */ |
| 373 | observer_notify_inferior_created (&core_ops, from_tty); |
| 374 | |
| 375 | p = bfd_core_file_failing_command (core_bfd); |
| 376 | if (p) |
| 377 | printf_filtered (_("Core was generated by `%s'.\n"), p); |
| 378 | |
| 379 | siggy = bfd_core_file_failing_signal (core_bfd); |
| 380 | if (siggy > 0) |
| 381 | /* NOTE: target_signal_from_host() converts a target signal value |
| 382 | into gdb's internal signal value. Unfortunately gdb's internal |
| 383 | value is called ``target_signal'' and this function got the |
| 384 | name ..._from_host(). */ |
| 385 | printf_filtered (_("Program terminated with signal %d, %s.\n"), siggy, |
| 386 | target_signal_to_string (target_signal_from_host (siggy))); |
| 387 | |
| 388 | /* Build up thread list from BFD sections. */ |
| 389 | |
| 390 | init_thread_list (); |
| 391 | bfd_map_over_sections (core_bfd, add_to_thread_list, |
| 392 | bfd_get_section_by_name (core_bfd, ".reg")); |
| 393 | |
| 394 | if (ontop) |
| 395 | { |
| 396 | /* Fetch all registers from core file. */ |
| 397 | target_fetch_registers (-1); |
| 398 | |
| 399 | /* Add symbols and section mappings for any shared libraries. */ |
| 400 | catch_errors (solib_add_stub, &from_tty, (char *) 0, RETURN_MASK_ALL); |
| 401 | |
| 402 | /* Now, set up the frame cache, and print the top of stack. */ |
| 403 | flush_cached_frames (); |
| 404 | select_frame (get_current_frame ()); |
| 405 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC); |
| 406 | } |
| 407 | else |
| 408 | { |
| 409 | warning ( |
| 410 | "you won't be able to access this core file until you terminate\n\ |
| 411 | your %s; do ``info files''", target_longname); |
| 412 | } |
| 413 | } |
| 414 | |
| 415 | static void |
| 416 | core_detach (char *args, int from_tty) |
| 417 | { |
| 418 | if (args) |
| 419 | error (_("Too many arguments")); |
| 420 | unpush_target (&core_ops); |
| 421 | reinit_frame_cache (); |
| 422 | if (from_tty) |
| 423 | printf_filtered (_("No core file now.\n")); |
| 424 | } |
| 425 | |
| 426 | |
| 427 | /* Try to retrieve registers from a section in core_bfd, and supply |
| 428 | them to core_vec->core_read_registers, as the register set numbered |
| 429 | WHICH. |
| 430 | |
| 431 | If inferior_ptid is zero, do the single-threaded thing: look for a |
| 432 | section named NAME. If inferior_ptid is non-zero, do the |
| 433 | multi-threaded thing: look for a section named "NAME/PID", where |
| 434 | PID is the shortest ASCII decimal representation of inferior_ptid. |
| 435 | |
| 436 | HUMAN_NAME is a human-readable name for the kind of registers the |
| 437 | NAME section contains, for use in error messages. |
| 438 | |
| 439 | If REQUIRED is non-zero, print an error if the core file doesn't |
| 440 | have a section by the appropriate name. Otherwise, just do nothing. */ |
| 441 | |
| 442 | static void |
| 443 | get_core_register_section (char *name, |
| 444 | int which, |
| 445 | char *human_name, |
| 446 | int required) |
| 447 | { |
| 448 | static char *section_name = NULL; |
| 449 | struct bfd_section *section; |
| 450 | bfd_size_type size; |
| 451 | char *contents; |
| 452 | |
| 453 | xfree (section_name); |
| 454 | if (PIDGET (inferior_ptid)) |
| 455 | section_name = xstrprintf ("%s/%d", name, PIDGET (inferior_ptid)); |
| 456 | else |
| 457 | section_name = xstrdup (name); |
| 458 | |
| 459 | section = bfd_get_section_by_name (core_bfd, section_name); |
| 460 | if (! section) |
| 461 | { |
| 462 | if (required) |
| 463 | warning (_("Couldn't find %s registers in core file."), human_name); |
| 464 | return; |
| 465 | } |
| 466 | |
| 467 | size = bfd_section_size (core_bfd, section); |
| 468 | contents = alloca (size); |
| 469 | if (! bfd_get_section_contents (core_bfd, section, contents, |
| 470 | (file_ptr) 0, size)) |
| 471 | { |
| 472 | warning (_("Couldn't read %s registers from `%s' section in core file."), |
| 473 | human_name, name); |
| 474 | return; |
| 475 | } |
| 476 | |
| 477 | if (core_gdbarch && gdbarch_regset_from_core_section_p (core_gdbarch)) |
| 478 | { |
| 479 | const struct regset *regset; |
| 480 | |
| 481 | regset = gdbarch_regset_from_core_section (core_gdbarch, name, size); |
| 482 | if (regset == NULL) |
| 483 | { |
| 484 | if (required) |
| 485 | warning (_("Couldn't recognize %s registers in core file."), |
| 486 | human_name); |
| 487 | return; |
| 488 | } |
| 489 | |
| 490 | regset->supply_regset (regset, current_regcache, -1, contents, size); |
| 491 | return; |
| 492 | } |
| 493 | |
| 494 | gdb_assert (core_vec); |
| 495 | core_vec->core_read_registers (contents, size, which, |
| 496 | ((CORE_ADDR) |
| 497 | bfd_section_vma (core_bfd, section))); |
| 498 | } |
| 499 | |
| 500 | |
| 501 | /* Get the registers out of a core file. This is the machine- |
| 502 | independent part. Fetch_core_registers is the machine-dependent |
| 503 | part, typically implemented in the xm-file for each architecture. */ |
| 504 | |
| 505 | /* We just get all the registers, so we don't use regno. */ |
| 506 | |
| 507 | static void |
| 508 | get_core_registers (int regno) |
| 509 | { |
| 510 | int status; |
| 511 | |
| 512 | if (!(core_gdbarch && gdbarch_regset_from_core_section_p (core_gdbarch)) |
| 513 | && (core_vec == NULL || core_vec->core_read_registers == NULL)) |
| 514 | { |
| 515 | fprintf_filtered (gdb_stderr, |
| 516 | "Can't fetch registers from this type of core file\n"); |
| 517 | return; |
| 518 | } |
| 519 | |
| 520 | get_core_register_section (".reg", 0, "general-purpose", 1); |
| 521 | get_core_register_section (".reg2", 2, "floating-point", 0); |
| 522 | get_core_register_section (".reg-xfp", 3, "extended floating-point", 0); |
| 523 | |
| 524 | deprecated_registers_fetched (); |
| 525 | } |
| 526 | |
| 527 | static void |
| 528 | core_files_info (struct target_ops *t) |
| 529 | { |
| 530 | print_section_info (t, core_bfd); |
| 531 | } |
| 532 | \f |
| 533 | static LONGEST |
| 534 | core_xfer_partial (struct target_ops *ops, enum target_object object, |
| 535 | const char *annex, gdb_byte *readbuf, |
| 536 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) |
| 537 | { |
| 538 | switch (object) |
| 539 | { |
| 540 | case TARGET_OBJECT_MEMORY: |
| 541 | if (readbuf) |
| 542 | return (*ops->deprecated_xfer_memory) (offset, readbuf, len, |
| 543 | 0/*write*/, NULL, ops); |
| 544 | if (writebuf) |
| 545 | return (*ops->deprecated_xfer_memory) (offset, readbuf, len, |
| 546 | 1/*write*/, NULL, ops); |
| 547 | return -1; |
| 548 | |
| 549 | case TARGET_OBJECT_AUXV: |
| 550 | if (readbuf) |
| 551 | { |
| 552 | /* When the aux vector is stored in core file, BFD |
| 553 | represents this with a fake section called ".auxv". */ |
| 554 | |
| 555 | struct bfd_section *section; |
| 556 | bfd_size_type size; |
| 557 | char *contents; |
| 558 | |
| 559 | section = bfd_get_section_by_name (core_bfd, ".auxv"); |
| 560 | if (section == NULL) |
| 561 | return -1; |
| 562 | |
| 563 | size = bfd_section_size (core_bfd, section); |
| 564 | if (offset >= size) |
| 565 | return 0; |
| 566 | size -= offset; |
| 567 | if (size > len) |
| 568 | size = len; |
| 569 | if (size > 0 |
| 570 | && !bfd_get_section_contents (core_bfd, section, readbuf, |
| 571 | (file_ptr) offset, size)) |
| 572 | { |
| 573 | warning (_("Couldn't read NT_AUXV note in core file.")); |
| 574 | return -1; |
| 575 | } |
| 576 | |
| 577 | return size; |
| 578 | } |
| 579 | return -1; |
| 580 | |
| 581 | case TARGET_OBJECT_WCOOKIE: |
| 582 | if (readbuf) |
| 583 | { |
| 584 | /* When the StackGhost cookie is stored in core file, BFD |
| 585 | represents this with a fake section called ".wcookie". */ |
| 586 | |
| 587 | struct bfd_section *section; |
| 588 | bfd_size_type size; |
| 589 | char *contents; |
| 590 | |
| 591 | section = bfd_get_section_by_name (core_bfd, ".wcookie"); |
| 592 | if (section == NULL) |
| 593 | return -1; |
| 594 | |
| 595 | size = bfd_section_size (core_bfd, section); |
| 596 | if (offset >= size) |
| 597 | return 0; |
| 598 | size -= offset; |
| 599 | if (size > len) |
| 600 | size = len; |
| 601 | if (size > 0 |
| 602 | && !bfd_get_section_contents (core_bfd, section, readbuf, |
| 603 | (file_ptr) offset, size)) |
| 604 | { |
| 605 | warning (_("Couldn't read StackGhost cookie in core file.")); |
| 606 | return -1; |
| 607 | } |
| 608 | |
| 609 | return size; |
| 610 | } |
| 611 | return -1; |
| 612 | |
| 613 | default: |
| 614 | if (ops->beneath != NULL) |
| 615 | return ops->beneath->to_xfer_partial (ops->beneath, object, annex, |
| 616 | readbuf, writebuf, offset, len); |
| 617 | return -1; |
| 618 | } |
| 619 | } |
| 620 | |
| 621 | \f |
| 622 | /* If mourn is being called in all the right places, this could be say |
| 623 | `gdb internal error' (since generic_mourn calls breakpoint_init_inferior). */ |
| 624 | |
| 625 | static int |
| 626 | ignore (CORE_ADDR addr, bfd_byte *contents) |
| 627 | { |
| 628 | return 0; |
| 629 | } |
| 630 | |
| 631 | |
| 632 | /* Okay, let's be honest: threads gleaned from a core file aren't |
| 633 | exactly lively, are they? On the other hand, if we don't claim |
| 634 | that each & every one is alive, then we don't get any of them |
| 635 | to appear in an "info thread" command, which is quite a useful |
| 636 | behaviour. |
| 637 | */ |
| 638 | static int |
| 639 | core_file_thread_alive (ptid_t tid) |
| 640 | { |
| 641 | return 1; |
| 642 | } |
| 643 | |
| 644 | /* Fill in core_ops with its defined operations and properties. */ |
| 645 | |
| 646 | static void |
| 647 | init_core_ops (void) |
| 648 | { |
| 649 | core_ops.to_shortname = "core"; |
| 650 | core_ops.to_longname = "Local core dump file"; |
| 651 | core_ops.to_doc = |
| 652 | "Use a core file as a target. Specify the filename of the core file."; |
| 653 | core_ops.to_open = core_open; |
| 654 | core_ops.to_close = core_close; |
| 655 | core_ops.to_attach = find_default_attach; |
| 656 | core_ops.to_detach = core_detach; |
| 657 | core_ops.to_fetch_registers = get_core_registers; |
| 658 | core_ops.to_xfer_partial = core_xfer_partial; |
| 659 | core_ops.deprecated_xfer_memory = xfer_memory; |
| 660 | core_ops.to_files_info = core_files_info; |
| 661 | core_ops.to_insert_breakpoint = ignore; |
| 662 | core_ops.to_remove_breakpoint = ignore; |
| 663 | core_ops.to_create_inferior = find_default_create_inferior; |
| 664 | core_ops.to_thread_alive = core_file_thread_alive; |
| 665 | core_ops.to_stratum = core_stratum; |
| 666 | core_ops.to_has_memory = 1; |
| 667 | core_ops.to_has_stack = 1; |
| 668 | core_ops.to_has_registers = 1; |
| 669 | core_ops.to_magic = OPS_MAGIC; |
| 670 | } |
| 671 | |
| 672 | /* non-zero if we should not do the add_target call in |
| 673 | _initialize_corelow; not initialized (i.e., bss) so that |
| 674 | the target can initialize it (i.e., data) if appropriate. |
| 675 | This needs to be set at compile time because we don't know |
| 676 | for sure whether the target's initialize routine is called |
| 677 | before us or after us. */ |
| 678 | int coreops_suppress_target; |
| 679 | |
| 680 | void |
| 681 | _initialize_corelow (void) |
| 682 | { |
| 683 | init_core_ops (); |
| 684 | |
| 685 | if (!coreops_suppress_target) |
| 686 | add_target (&core_ops); |
| 687 | } |