| 1 | /* Core dump and executable file functions below target vector, for GDB. |
| 2 | Copyright 1986, 87, 89, 91, 92, 93, 94, 95, 96, 97, 1998 |
| 3 | 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 2 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, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "gdb_string.h" |
| 23 | #include <errno.h> |
| 24 | #include <signal.h> |
| 25 | #include <fcntl.h> |
| 26 | #include <unistd.h> |
| 27 | #include "frame.h" /* required by inferior.h */ |
| 28 | #include "inferior.h" |
| 29 | #include "symtab.h" |
| 30 | #include "command.h" |
| 31 | #include "bfd.h" |
| 32 | #include "target.h" |
| 33 | #include "gdbcore.h" |
| 34 | #include "gdbthread.h" |
| 35 | |
| 36 | /* List of all available core_fns. On gdb startup, each core file register |
| 37 | reader calls add_core_fns() to register information on each core format it |
| 38 | is prepared to read. */ |
| 39 | |
| 40 | static struct core_fns *core_file_fns = NULL; |
| 41 | |
| 42 | static void core_files_info PARAMS ((struct target_ops *)); |
| 43 | |
| 44 | #ifdef SOLIB_ADD |
| 45 | static int solib_add_stub PARAMS ((PTR)); |
| 46 | #endif |
| 47 | |
| 48 | static void core_open PARAMS ((char *, int)); |
| 49 | |
| 50 | static void core_detach PARAMS ((char *, int)); |
| 51 | |
| 52 | static void core_close PARAMS ((int)); |
| 53 | |
| 54 | static void get_core_registers PARAMS ((int)); |
| 55 | |
| 56 | static void add_to_thread_list PARAMS ((bfd *, asection *, PTR)); |
| 57 | |
| 58 | static int ignore PARAMS ((CORE_ADDR, char *)); |
| 59 | |
| 60 | static char *core_file_to_sym_file PARAMS ((char *)); |
| 61 | |
| 62 | static int core_file_thread_alive PARAMS ((int tid)); |
| 63 | |
| 64 | static void init_core_ops PARAMS ((void)); |
| 65 | |
| 66 | void _initialize_corelow PARAMS ((void)); |
| 67 | |
| 68 | struct target_ops core_ops; |
| 69 | |
| 70 | /* Link a new core_fns into the global core_file_fns list. Called on gdb |
| 71 | startup by the _initialize routine in each core file register reader, to |
| 72 | register information about each format the the reader is prepared to |
| 73 | handle. */ |
| 74 | |
| 75 | void |
| 76 | add_core_fns (cf) |
| 77 | struct core_fns *cf; |
| 78 | { |
| 79 | cf -> next = core_file_fns; |
| 80 | core_file_fns = cf; |
| 81 | } |
| 82 | |
| 83 | |
| 84 | /* Discard all vestiges of any previous core file and mark data and stack |
| 85 | spaces as empty. */ |
| 86 | |
| 87 | /* ARGSUSED */ |
| 88 | static void |
| 89 | core_close (quitting) |
| 90 | int quitting; |
| 91 | { |
| 92 | char *name; |
| 93 | |
| 94 | if (core_bfd) |
| 95 | { |
| 96 | inferior_pid = 0; /* Avoid confusion from thread stuff */ |
| 97 | |
| 98 | name = bfd_get_filename (core_bfd); |
| 99 | if (!bfd_close (core_bfd)) |
| 100 | warning ("cannot close \"%s\": %s", |
| 101 | name, bfd_errmsg (bfd_get_error ())); |
| 102 | free (name); |
| 103 | core_bfd = NULL; |
| 104 | #ifdef CLEAR_SOLIB |
| 105 | CLEAR_SOLIB (); |
| 106 | #endif |
| 107 | if (core_ops.to_sections) |
| 108 | { |
| 109 | free ((PTR)core_ops.to_sections); |
| 110 | core_ops.to_sections = NULL; |
| 111 | core_ops.to_sections_end = NULL; |
| 112 | } |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | #ifdef SOLIB_ADD |
| 117 | /* Stub function for catch_errors around shared library hacking. FROM_TTYP |
| 118 | is really an int * which points to from_tty. */ |
| 119 | |
| 120 | static int |
| 121 | solib_add_stub (from_ttyp) |
| 122 | PTR from_ttyp; |
| 123 | { |
| 124 | SOLIB_ADD (NULL, *(int *)from_ttyp, ¤t_target); |
| 125 | re_enable_breakpoints_in_shlibs (); |
| 126 | return 0; |
| 127 | } |
| 128 | #endif /* SOLIB_ADD */ |
| 129 | |
| 130 | /* Look for sections whose names start with `.reg/' so that we can extract the |
| 131 | list of threads in a core file. */ |
| 132 | |
| 133 | static void |
| 134 | add_to_thread_list (abfd, asect, reg_sect_arg) |
| 135 | bfd *abfd; |
| 136 | asection *asect; |
| 137 | PTR reg_sect_arg; |
| 138 | { |
| 139 | int thread_id; |
| 140 | asection *reg_sect = (asection *) reg_sect_arg; |
| 141 | |
| 142 | if (strncmp (bfd_section_name (abfd, asect), ".reg/", 5) != 0) |
| 143 | return; |
| 144 | |
| 145 | thread_id = atoi (bfd_section_name (abfd, asect) + 5); |
| 146 | |
| 147 | add_thread (thread_id); |
| 148 | |
| 149 | /* Warning, Will Robinson, looking at BFD private data! */ |
| 150 | |
| 151 | if (reg_sect != NULL |
| 152 | && asect->filepos == reg_sect->filepos) /* Did we find .reg? */ |
| 153 | inferior_pid = thread_id; /* Yes, make it current */ |
| 154 | } |
| 155 | |
| 156 | /* This routine opens and sets up the core file bfd. */ |
| 157 | |
| 158 | static void |
| 159 | core_open (filename, from_tty) |
| 160 | char *filename; |
| 161 | int from_tty; |
| 162 | { |
| 163 | const char *p; |
| 164 | int siggy; |
| 165 | struct cleanup *old_chain; |
| 166 | char *temp; |
| 167 | bfd *temp_bfd; |
| 168 | int ontop; |
| 169 | int scratch_chan; |
| 170 | |
| 171 | target_preopen (from_tty); |
| 172 | if (!filename) |
| 173 | { |
| 174 | error (core_bfd ? |
| 175 | "No core file specified. (Use `detach' to stop debugging a core file.)" |
| 176 | : "No core file specified."); |
| 177 | } |
| 178 | |
| 179 | filename = tilde_expand (filename); |
| 180 | if (filename[0] != '/') |
| 181 | { |
| 182 | temp = concat (current_directory, "/", filename, NULL); |
| 183 | free (filename); |
| 184 | filename = temp; |
| 185 | } |
| 186 | |
| 187 | old_chain = make_cleanup (free, filename); |
| 188 | |
| 189 | scratch_chan = open (filename, write_files ? O_RDWR : O_RDONLY, 0); |
| 190 | if (scratch_chan < 0) |
| 191 | perror_with_name (filename); |
| 192 | |
| 193 | temp_bfd = bfd_fdopenr (filename, gnutarget, scratch_chan); |
| 194 | if (temp_bfd == NULL) |
| 195 | perror_with_name (filename); |
| 196 | |
| 197 | if (!bfd_check_format (temp_bfd, bfd_core)) |
| 198 | { |
| 199 | /* Do it after the err msg */ |
| 200 | /* FIXME: should be checking for errors from bfd_close (for one thing, |
| 201 | on error it does not free all the storage associated with the |
| 202 | bfd). */ |
| 203 | make_cleanup ((make_cleanup_func) bfd_close, temp_bfd); |
| 204 | error ("\"%s\" is not a core dump: %s", |
| 205 | filename, bfd_errmsg (bfd_get_error ())); |
| 206 | } |
| 207 | |
| 208 | /* Looks semi-reasonable. Toss the old core file and work on the new. */ |
| 209 | |
| 210 | discard_cleanups (old_chain); /* Don't free filename any more */ |
| 211 | unpush_target (&core_ops); |
| 212 | core_bfd = temp_bfd; |
| 213 | old_chain = make_cleanup ((make_cleanup_func) core_close, core_bfd); |
| 214 | |
| 215 | validate_files (); |
| 216 | |
| 217 | /* Find the data section */ |
| 218 | if (build_section_table (core_bfd, &core_ops.to_sections, |
| 219 | &core_ops.to_sections_end)) |
| 220 | error ("\"%s\": Can't find sections: %s", |
| 221 | bfd_get_filename (core_bfd), bfd_errmsg (bfd_get_error ())); |
| 222 | |
| 223 | ontop = !push_target (&core_ops); |
| 224 | discard_cleanups (old_chain); |
| 225 | |
| 226 | p = bfd_core_file_failing_command (core_bfd); |
| 227 | if (p) |
| 228 | printf_filtered ("Core was generated by `%s'.\n", p); |
| 229 | |
| 230 | siggy = bfd_core_file_failing_signal (core_bfd); |
| 231 | if (siggy > 0) |
| 232 | printf_filtered ("Program terminated with signal %d, %s.\n", siggy, |
| 233 | safe_strsignal (siggy)); |
| 234 | |
| 235 | /* Build up thread list from BFD sections. */ |
| 236 | |
| 237 | init_thread_list (); |
| 238 | bfd_map_over_sections (core_bfd, add_to_thread_list, |
| 239 | bfd_get_section_by_name (core_bfd, ".reg")); |
| 240 | |
| 241 | if (ontop) |
| 242 | { |
| 243 | /* Fetch all registers from core file. */ |
| 244 | target_fetch_registers (-1); |
| 245 | |
| 246 | /* Add symbols and section mappings for any shared libraries. */ |
| 247 | #ifdef SOLIB_ADD |
| 248 | catch_errors (solib_add_stub, &from_tty, (char *)0, |
| 249 | RETURN_MASK_ALL); |
| 250 | #endif |
| 251 | |
| 252 | /* Now, set up the frame cache, and print the top of stack. */ |
| 253 | flush_cached_frames (); |
| 254 | select_frame (get_current_frame (), 0); |
| 255 | print_stack_frame (selected_frame, selected_frame_level, 1); |
| 256 | } |
| 257 | else |
| 258 | { |
| 259 | warning ( |
| 260 | "you won't be able to access this core file until you terminate\n\ |
| 261 | your %s; do ``info files''", target_longname); |
| 262 | } |
| 263 | } |
| 264 | |
| 265 | static void |
| 266 | core_detach (args, from_tty) |
| 267 | char *args; |
| 268 | int from_tty; |
| 269 | { |
| 270 | if (args) |
| 271 | error ("Too many arguments"); |
| 272 | unpush_target (&core_ops); |
| 273 | reinit_frame_cache (); |
| 274 | if (from_tty) |
| 275 | printf_filtered ("No core file now.\n"); |
| 276 | } |
| 277 | |
| 278 | /* Get the registers out of a core file. This is the machine- |
| 279 | independent part. Fetch_core_registers is the machine-dependent |
| 280 | part, typically implemented in the xm-file for each architecture. */ |
| 281 | |
| 282 | /* We just get all the registers, so we don't use regno. */ |
| 283 | |
| 284 | /* ARGSUSED */ |
| 285 | static void |
| 286 | get_core_registers (regno) |
| 287 | int regno; |
| 288 | { |
| 289 | sec_ptr reg_sec; |
| 290 | unsigned size; |
| 291 | char *the_regs; |
| 292 | char secname[30]; |
| 293 | enum bfd_flavour our_flavour = bfd_get_flavour (core_bfd); |
| 294 | struct core_fns *cf = NULL; |
| 295 | |
| 296 | if (core_file_fns == NULL) |
| 297 | { |
| 298 | fprintf_filtered (gdb_stderr, |
| 299 | "Can't fetch registers from this type of core file\n"); |
| 300 | return; |
| 301 | } |
| 302 | |
| 303 | /* Thread support. If inferior_pid is non-zero, then we have found a core |
| 304 | file with threads (or multiple processes). In that case, we need to |
| 305 | use the appropriate register section, else we just use `.reg'. */ |
| 306 | |
| 307 | /* XXX - same thing needs to be done for floating-point (.reg2) sections. */ |
| 308 | |
| 309 | if (inferior_pid) |
| 310 | sprintf (secname, ".reg/%d", inferior_pid); |
| 311 | else |
| 312 | strcpy (secname, ".reg"); |
| 313 | |
| 314 | reg_sec = bfd_get_section_by_name (core_bfd, secname); |
| 315 | if (!reg_sec) |
| 316 | goto cant; |
| 317 | size = bfd_section_size (core_bfd, reg_sec); |
| 318 | the_regs = alloca (size); |
| 319 | /* Look for the core functions that match this flavor. Default to the |
| 320 | first one if nothing matches. */ |
| 321 | for (cf = core_file_fns; cf != NULL; cf = cf -> next) |
| 322 | { |
| 323 | if (our_flavour == cf -> core_flavour) |
| 324 | { |
| 325 | break; |
| 326 | } |
| 327 | } |
| 328 | if (cf == NULL) |
| 329 | { |
| 330 | cf = core_file_fns; |
| 331 | } |
| 332 | if (cf != NULL && |
| 333 | bfd_get_section_contents (core_bfd, reg_sec, the_regs, (file_ptr)0, size) && |
| 334 | cf -> core_read_registers != NULL) |
| 335 | { |
| 336 | (cf -> core_read_registers (the_regs, size, 0, |
| 337 | (unsigned) bfd_section_vma (abfd,reg_sec))); |
| 338 | } |
| 339 | else |
| 340 | { |
| 341 | cant: |
| 342 | fprintf_filtered (gdb_stderr, |
| 343 | "Couldn't fetch registers from core file: %s\n", |
| 344 | bfd_errmsg (bfd_get_error ())); |
| 345 | } |
| 346 | |
| 347 | /* Now do it again for the float registers, if they exist. */ |
| 348 | reg_sec = bfd_get_section_by_name (core_bfd, ".reg2"); |
| 349 | if (reg_sec) |
| 350 | { |
| 351 | size = bfd_section_size (core_bfd, reg_sec); |
| 352 | the_regs = alloca (size); |
| 353 | if (cf != NULL && |
| 354 | bfd_get_section_contents (core_bfd, reg_sec, the_regs, (file_ptr)0, size) && |
| 355 | cf -> core_read_registers != NULL) |
| 356 | { |
| 357 | (cf -> core_read_registers (the_regs, size, 2, |
| 358 | (unsigned) bfd_section_vma (abfd,reg_sec))); |
| 359 | } |
| 360 | else |
| 361 | { |
| 362 | fprintf_filtered (gdb_stderr, |
| 363 | "Couldn't fetch register set 2 from core file: %s\n", |
| 364 | bfd_errmsg (bfd_get_error ())); |
| 365 | } |
| 366 | } |
| 367 | registers_fetched (); |
| 368 | } |
| 369 | |
| 370 | static char * |
| 371 | core_file_to_sym_file (core) |
| 372 | char * core; |
| 373 | { |
| 374 | CONST char * failing_command; |
| 375 | char * p; |
| 376 | char * temp; |
| 377 | bfd * temp_bfd; |
| 378 | int scratch_chan; |
| 379 | |
| 380 | if (! core) |
| 381 | error ("No core file specified."); |
| 382 | |
| 383 | core = tilde_expand (core); |
| 384 | if (core[0] != '/') |
| 385 | { |
| 386 | temp = concat (current_directory, "/", core, NULL); |
| 387 | core = temp; |
| 388 | } |
| 389 | |
| 390 | scratch_chan = open (core, write_files ? O_RDWR : O_RDONLY, 0); |
| 391 | if (scratch_chan < 0) |
| 392 | perror_with_name (core); |
| 393 | |
| 394 | temp_bfd = bfd_fdopenr (core, gnutarget, scratch_chan); |
| 395 | if (temp_bfd == NULL) |
| 396 | perror_with_name (core); |
| 397 | |
| 398 | if (!bfd_check_format (temp_bfd, bfd_core)) |
| 399 | { |
| 400 | /* Do it after the err msg */ |
| 401 | /* FIXME: should be checking for errors from bfd_close (for one thing, |
| 402 | on error it does not free all the storage associated with the |
| 403 | bfd). */ |
| 404 | make_cleanup ((make_cleanup_func) bfd_close, temp_bfd); |
| 405 | error ("\"%s\" is not a core dump: %s", |
| 406 | core, bfd_errmsg (bfd_get_error ())); |
| 407 | } |
| 408 | |
| 409 | /* Find the data section */ |
| 410 | if (build_section_table (temp_bfd, &core_ops.to_sections, |
| 411 | &core_ops.to_sections_end)) |
| 412 | error ("\"%s\": Can't find sections: %s", |
| 413 | bfd_get_filename (temp_bfd), bfd_errmsg (bfd_get_error ())); |
| 414 | |
| 415 | failing_command = bfd_core_file_failing_command (temp_bfd); |
| 416 | |
| 417 | bfd_close (temp_bfd); |
| 418 | |
| 419 | /* If we found a filename, remember that it is probably saved |
| 420 | relative to the executable that created it. If working directory |
| 421 | isn't there now, we may not be able to find the executable. Rather |
| 422 | than trying to be sauve about finding it, just check if the file |
| 423 | exists where we are now. If not, then punt and tell our client |
| 424 | we couldn't find the sym file. |
| 425 | */ |
| 426 | p = (char *) failing_command; |
| 427 | if ((p != NULL) && (access (p, F_OK) != 0)) |
| 428 | p = NULL; |
| 429 | |
| 430 | return p; |
| 431 | } |
| 432 | |
| 433 | static void |
| 434 | core_files_info (t) |
| 435 | struct target_ops *t; |
| 436 | { |
| 437 | print_section_info (t, core_bfd); |
| 438 | } |
| 439 | \f |
| 440 | /* If mourn is being called in all the right places, this could be say |
| 441 | `gdb internal error' (since generic_mourn calls breakpoint_init_inferior). */ |
| 442 | |
| 443 | static int |
| 444 | ignore (addr, contents) |
| 445 | CORE_ADDR addr; |
| 446 | char *contents; |
| 447 | { |
| 448 | return 0; |
| 449 | } |
| 450 | |
| 451 | |
| 452 | /* Okay, let's be honest: threads gleaned from a core file aren't |
| 453 | exactly lively, are they? On the other hand, if we don't claim |
| 454 | that each & every one is alive, then we don't get any of them |
| 455 | to appear in an "info thread" command, which is quite a useful |
| 456 | behaviour. |
| 457 | */ |
| 458 | static int |
| 459 | core_file_thread_alive (tid) |
| 460 | int tid; |
| 461 | { |
| 462 | return 1; |
| 463 | } |
| 464 | |
| 465 | /* Fill in core_ops with its defined operations and properties. */ |
| 466 | |
| 467 | static void |
| 468 | init_core_ops () |
| 469 | { |
| 470 | core_ops.to_shortname = "core"; |
| 471 | core_ops.to_longname = "Local core dump file"; |
| 472 | core_ops.to_doc = |
| 473 | "Use a core file as a target. Specify the filename of the core file."; |
| 474 | core_ops.to_open = core_open; |
| 475 | core_ops.to_close = core_close; |
| 476 | core_ops.to_attach = find_default_attach; |
| 477 | core_ops.to_require_attach = find_default_require_attach; |
| 478 | core_ops.to_detach = core_detach; |
| 479 | core_ops.to_require_detach = find_default_require_detach; |
| 480 | core_ops.to_fetch_registers = get_core_registers; |
| 481 | core_ops.to_xfer_memory = xfer_memory; |
| 482 | core_ops.to_files_info = core_files_info; |
| 483 | core_ops.to_insert_breakpoint = ignore; |
| 484 | core_ops.to_remove_breakpoint = ignore; |
| 485 | core_ops.to_create_inferior = find_default_create_inferior; |
| 486 | core_ops.to_clone_and_follow_inferior = find_default_clone_and_follow_inferior; |
| 487 | core_ops.to_thread_alive = core_file_thread_alive; |
| 488 | core_ops.to_core_file_to_sym_file = core_file_to_sym_file; |
| 489 | core_ops.to_stratum = core_stratum; |
| 490 | core_ops.to_has_memory = 1; |
| 491 | core_ops.to_has_stack = 1; |
| 492 | core_ops.to_has_registers = 1; |
| 493 | core_ops.to_magic = OPS_MAGIC; |
| 494 | } |
| 495 | |
| 496 | /* non-zero if we should not do the add_target call in |
| 497 | _initialize_corelow; not initialized (i.e., bss) so that |
| 498 | the target can initialize it (i.e., data) if appropriate. |
| 499 | This needs to be set at compile time because we don't know |
| 500 | for sure whether the target's initialize routine is called |
| 501 | before us or after us. */ |
| 502 | int coreops_suppress_target; |
| 503 | |
| 504 | void |
| 505 | _initialize_corelow () |
| 506 | { |
| 507 | init_core_ops (); |
| 508 | |
| 509 | if (!coreops_suppress_target) |
| 510 | add_target (&core_ops); |
| 511 | } |