| 1 | /* Work with executable files, for GDB. |
| 2 | |
| 3 | Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, |
| 4 | 1998, 1999, 2000, 2001, 2002, 2003, 2007, 2008, 2009, 2010, 2011 |
| 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 3 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, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "frame.h" |
| 24 | #include "inferior.h" |
| 25 | #include "target.h" |
| 26 | #include "gdbcmd.h" |
| 27 | #include "language.h" |
| 28 | #include "symfile.h" |
| 29 | #include "objfiles.h" |
| 30 | #include "completer.h" |
| 31 | #include "value.h" |
| 32 | #include "exec.h" |
| 33 | #include "observer.h" |
| 34 | #include "arch-utils.h" |
| 35 | #include "gdbthread.h" |
| 36 | #include "progspace.h" |
| 37 | |
| 38 | #include <fcntl.h> |
| 39 | #include "readline/readline.h" |
| 40 | #include "gdb_string.h" |
| 41 | |
| 42 | #include "gdbcore.h" |
| 43 | |
| 44 | #include <ctype.h> |
| 45 | #include "gdb_stat.h" |
| 46 | |
| 47 | #include "xcoffsolib.h" |
| 48 | |
| 49 | struct vmap *map_vmap (bfd *, bfd *); |
| 50 | |
| 51 | void (*deprecated_file_changed_hook) (char *); |
| 52 | |
| 53 | /* Prototypes for local functions */ |
| 54 | |
| 55 | static void file_command (char *, int); |
| 56 | |
| 57 | static void set_section_command (char *, int); |
| 58 | |
| 59 | static void exec_files_info (struct target_ops *); |
| 60 | |
| 61 | static void init_exec_ops (void); |
| 62 | |
| 63 | void _initialize_exec (void); |
| 64 | |
| 65 | /* The target vector for executable files. */ |
| 66 | |
| 67 | struct target_ops exec_ops; |
| 68 | |
| 69 | /* True if the exec target is pushed on the stack. */ |
| 70 | static int using_exec_ops; |
| 71 | |
| 72 | /* Whether to open exec and core files read-only or read-write. */ |
| 73 | |
| 74 | int write_files = 0; |
| 75 | static void |
| 76 | show_write_files (struct ui_file *file, int from_tty, |
| 77 | struct cmd_list_element *c, const char *value) |
| 78 | { |
| 79 | fprintf_filtered (file, _("Writing into executable and core files is %s.\n"), |
| 80 | value); |
| 81 | } |
| 82 | |
| 83 | |
| 84 | struct vmap *vmap; |
| 85 | |
| 86 | static void |
| 87 | exec_open (char *args, int from_tty) |
| 88 | { |
| 89 | target_preopen (from_tty); |
| 90 | exec_file_attach (args, from_tty); |
| 91 | } |
| 92 | |
| 93 | /* Close and clear exec_bfd. If we end up with no target sections to |
| 94 | read memory from, this unpushes the exec_ops target. */ |
| 95 | |
| 96 | void |
| 97 | exec_close (void) |
| 98 | { |
| 99 | if (exec_bfd) |
| 100 | { |
| 101 | bfd *abfd = exec_bfd; |
| 102 | char *name = bfd_get_filename (abfd); |
| 103 | |
| 104 | gdb_bfd_close_or_warn (abfd); |
| 105 | xfree (name); |
| 106 | |
| 107 | /* Removing target sections may close the exec_ops target. |
| 108 | Clear exec_bfd before doing so to prevent recursion. */ |
| 109 | exec_bfd = NULL; |
| 110 | exec_bfd_mtime = 0; |
| 111 | |
| 112 | remove_target_sections (abfd); |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | /* This is the target_close implementation. Clears all target |
| 117 | sections and closes all executable bfds from all program spaces. */ |
| 118 | |
| 119 | static void |
| 120 | exec_close_1 (int quitting) |
| 121 | { |
| 122 | int need_symtab_cleanup = 0; |
| 123 | struct vmap *vp, *nxt; |
| 124 | |
| 125 | using_exec_ops = 0; |
| 126 | |
| 127 | for (nxt = vmap; nxt != NULL;) |
| 128 | { |
| 129 | vp = nxt; |
| 130 | nxt = vp->nxt; |
| 131 | |
| 132 | /* if there is an objfile associated with this bfd, |
| 133 | free_objfile() will do proper cleanup of objfile *and* bfd. */ |
| 134 | |
| 135 | if (vp->objfile) |
| 136 | { |
| 137 | free_objfile (vp->objfile); |
| 138 | need_symtab_cleanup = 1; |
| 139 | } |
| 140 | else if (vp->bfd != exec_bfd) |
| 141 | /* FIXME-leak: We should be freeing vp->name too, I think. */ |
| 142 | gdb_bfd_close_or_warn (vp->bfd); |
| 143 | |
| 144 | xfree (vp); |
| 145 | } |
| 146 | |
| 147 | vmap = NULL; |
| 148 | |
| 149 | { |
| 150 | struct program_space *ss; |
| 151 | struct cleanup *old_chain; |
| 152 | |
| 153 | old_chain = save_current_program_space (); |
| 154 | ALL_PSPACES (ss) |
| 155 | { |
| 156 | set_current_program_space (ss); |
| 157 | |
| 158 | /* Delete all target sections. */ |
| 159 | resize_section_table |
| 160 | (current_target_sections, |
| 161 | -resize_section_table (current_target_sections, 0)); |
| 162 | |
| 163 | exec_close (); |
| 164 | } |
| 165 | |
| 166 | do_cleanups (old_chain); |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | void |
| 171 | exec_file_clear (int from_tty) |
| 172 | { |
| 173 | /* Remove exec file. */ |
| 174 | exec_close (); |
| 175 | |
| 176 | if (from_tty) |
| 177 | printf_unfiltered (_("No executable file now.\n")); |
| 178 | } |
| 179 | |
| 180 | /* Set FILENAME as the new exec file. |
| 181 | |
| 182 | This function is intended to be behave essentially the same |
| 183 | as exec_file_command, except that the latter will detect when |
| 184 | a target is being debugged, and will ask the user whether it |
| 185 | should be shut down first. (If the answer is "no", then the |
| 186 | new file is ignored.) |
| 187 | |
| 188 | This file is used by exec_file_command, to do the work of opening |
| 189 | and processing the exec file after any prompting has happened. |
| 190 | |
| 191 | And, it is used by child_attach, when the attach command was |
| 192 | given a pid but not a exec pathname, and the attach command could |
| 193 | figure out the pathname from the pid. (In this case, we shouldn't |
| 194 | ask the user whether the current target should be shut down -- |
| 195 | we're supplying the exec pathname late for good reason.) */ |
| 196 | |
| 197 | void |
| 198 | exec_file_attach (char *filename, int from_tty) |
| 199 | { |
| 200 | /* Remove any previous exec file. */ |
| 201 | exec_close (); |
| 202 | |
| 203 | /* Now open and digest the file the user requested, if any. */ |
| 204 | |
| 205 | if (!filename) |
| 206 | { |
| 207 | if (from_tty) |
| 208 | printf_unfiltered (_("No executable file now.\n")); |
| 209 | |
| 210 | set_gdbarch_from_file (NULL); |
| 211 | } |
| 212 | else |
| 213 | { |
| 214 | struct cleanup *cleanups; |
| 215 | char *scratch_pathname; |
| 216 | int scratch_chan; |
| 217 | struct target_section *sections = NULL, *sections_end = NULL; |
| 218 | char **matching; |
| 219 | |
| 220 | scratch_chan = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST, filename, |
| 221 | write_files ? O_RDWR | O_BINARY : O_RDONLY | O_BINARY, |
| 222 | &scratch_pathname); |
| 223 | #if defined(__GO32__) || defined(_WIN32) || defined(__CYGWIN__) |
| 224 | if (scratch_chan < 0) |
| 225 | { |
| 226 | char *exename = alloca (strlen (filename) + 5); |
| 227 | |
| 228 | strcat (strcpy (exename, filename), ".exe"); |
| 229 | scratch_chan = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST, exename, |
| 230 | write_files ? O_RDWR | O_BINARY : O_RDONLY | O_BINARY, |
| 231 | &scratch_pathname); |
| 232 | } |
| 233 | #endif |
| 234 | if (scratch_chan < 0) |
| 235 | perror_with_name (filename); |
| 236 | exec_bfd = bfd_fopen (scratch_pathname, gnutarget, |
| 237 | write_files ? FOPEN_RUB : FOPEN_RB, |
| 238 | scratch_chan); |
| 239 | |
| 240 | if (!exec_bfd) |
| 241 | { |
| 242 | close (scratch_chan); |
| 243 | error (_("\"%s\": could not open as an executable file: %s"), |
| 244 | scratch_pathname, bfd_errmsg (bfd_get_error ())); |
| 245 | } |
| 246 | |
| 247 | /* At this point, scratch_pathname and exec_bfd->name both point to the |
| 248 | same malloc'd string. However exec_close() will attempt to free it |
| 249 | via the exec_bfd->name pointer, so we need to make another copy and |
| 250 | leave exec_bfd as the new owner of the original copy. */ |
| 251 | scratch_pathname = xstrdup (scratch_pathname); |
| 252 | cleanups = make_cleanup (xfree, scratch_pathname); |
| 253 | |
| 254 | if (!bfd_check_format_matches (exec_bfd, bfd_object, &matching)) |
| 255 | { |
| 256 | /* Make sure to close exec_bfd, or else "run" might try to use |
| 257 | it. */ |
| 258 | exec_close (); |
| 259 | error (_("\"%s\": not in executable format: %s"), |
| 260 | scratch_pathname, |
| 261 | gdb_bfd_errmsg (bfd_get_error (), matching)); |
| 262 | } |
| 263 | |
| 264 | /* FIXME - This should only be run for RS6000, but the ifdef is a poor |
| 265 | way to accomplish. */ |
| 266 | #ifdef DEPRECATED_IBM6000_TARGET |
| 267 | /* Setup initial vmap. */ |
| 268 | |
| 269 | map_vmap (exec_bfd, 0); |
| 270 | if (vmap == NULL) |
| 271 | { |
| 272 | /* Make sure to close exec_bfd, or else "run" might try to use |
| 273 | it. */ |
| 274 | exec_close (); |
| 275 | error (_("\"%s\": can't find the file sections: %s"), |
| 276 | scratch_pathname, bfd_errmsg (bfd_get_error ())); |
| 277 | } |
| 278 | #endif /* DEPRECATED_IBM6000_TARGET */ |
| 279 | |
| 280 | if (build_section_table (exec_bfd, §ions, §ions_end)) |
| 281 | { |
| 282 | /* Make sure to close exec_bfd, or else "run" might try to use |
| 283 | it. */ |
| 284 | exec_close (); |
| 285 | error (_("\"%s\": can't find the file sections: %s"), |
| 286 | scratch_pathname, bfd_errmsg (bfd_get_error ())); |
| 287 | } |
| 288 | |
| 289 | exec_bfd_mtime = bfd_get_mtime (exec_bfd); |
| 290 | |
| 291 | validate_files (); |
| 292 | |
| 293 | set_gdbarch_from_file (exec_bfd); |
| 294 | |
| 295 | /* Add the executable's sections to the current address spaces' |
| 296 | list of sections. This possibly pushes the exec_ops |
| 297 | target. */ |
| 298 | add_target_sections (sections, sections_end); |
| 299 | xfree (sections); |
| 300 | |
| 301 | /* Tell display code (if any) about the changed file name. */ |
| 302 | if (deprecated_exec_file_display_hook) |
| 303 | (*deprecated_exec_file_display_hook) (filename); |
| 304 | |
| 305 | do_cleanups (cleanups); |
| 306 | } |
| 307 | bfd_cache_close_all (); |
| 308 | observer_notify_executable_changed (); |
| 309 | } |
| 310 | |
| 311 | /* Process the first arg in ARGS as the new exec file. |
| 312 | |
| 313 | Note that we have to explicitly ignore additional args, since we can |
| 314 | be called from file_command(), which also calls symbol_file_command() |
| 315 | which can take multiple args. |
| 316 | |
| 317 | If ARGS is NULL, we just want to close the exec file. */ |
| 318 | |
| 319 | static void |
| 320 | exec_file_command (char *args, int from_tty) |
| 321 | { |
| 322 | char **argv; |
| 323 | char *filename; |
| 324 | |
| 325 | if (from_tty && target_has_execution |
| 326 | && !query (_("A program is being debugged already.\n" |
| 327 | "Are you sure you want to change the file? "))) |
| 328 | error (_("File not changed.")); |
| 329 | |
| 330 | if (args) |
| 331 | { |
| 332 | struct cleanup *cleanups; |
| 333 | |
| 334 | /* Scan through the args and pick up the first non option arg |
| 335 | as the filename. */ |
| 336 | |
| 337 | argv = gdb_buildargv (args); |
| 338 | cleanups = make_cleanup_freeargv (argv); |
| 339 | |
| 340 | for (; (*argv != NULL) && (**argv == '-'); argv++) |
| 341 | {; |
| 342 | } |
| 343 | if (*argv == NULL) |
| 344 | error (_("No executable file name was specified")); |
| 345 | |
| 346 | filename = tilde_expand (*argv); |
| 347 | make_cleanup (xfree, filename); |
| 348 | exec_file_attach (filename, from_tty); |
| 349 | |
| 350 | do_cleanups (cleanups); |
| 351 | } |
| 352 | else |
| 353 | exec_file_attach (NULL, from_tty); |
| 354 | } |
| 355 | |
| 356 | /* Set both the exec file and the symbol file, in one command. |
| 357 | What a novelty. Why did GDB go through four major releases before this |
| 358 | command was added? */ |
| 359 | |
| 360 | static void |
| 361 | file_command (char *arg, int from_tty) |
| 362 | { |
| 363 | /* FIXME, if we lose on reading the symbol file, we should revert |
| 364 | the exec file, but that's rough. */ |
| 365 | exec_file_command (arg, from_tty); |
| 366 | symbol_file_command (arg, from_tty); |
| 367 | if (deprecated_file_changed_hook) |
| 368 | deprecated_file_changed_hook (arg); |
| 369 | } |
| 370 | \f |
| 371 | |
| 372 | /* Locate all mappable sections of a BFD file. |
| 373 | table_pp_char is a char * to get it through bfd_map_over_sections; |
| 374 | we cast it back to its proper type. */ |
| 375 | |
| 376 | static void |
| 377 | add_to_section_table (bfd *abfd, struct bfd_section *asect, |
| 378 | void *table_pp_char) |
| 379 | { |
| 380 | struct target_section **table_pp = (struct target_section **) table_pp_char; |
| 381 | flagword aflag; |
| 382 | |
| 383 | /* Check the section flags, but do not discard zero-length sections, since |
| 384 | some symbols may still be attached to this section. For instance, we |
| 385 | encountered on sparc-solaris 2.10 a shared library with an empty .bss |
| 386 | section to which a symbol named "_end" was attached. The address |
| 387 | of this symbol still needs to be relocated. */ |
| 388 | aflag = bfd_get_section_flags (abfd, asect); |
| 389 | if (!(aflag & SEC_ALLOC)) |
| 390 | return; |
| 391 | |
| 392 | (*table_pp)->bfd = abfd; |
| 393 | (*table_pp)->the_bfd_section = asect; |
| 394 | (*table_pp)->addr = bfd_section_vma (abfd, asect); |
| 395 | (*table_pp)->endaddr = (*table_pp)->addr + bfd_section_size (abfd, asect); |
| 396 | (*table_pp)++; |
| 397 | } |
| 398 | |
| 399 | int |
| 400 | resize_section_table (struct target_section_table *table, int num_added) |
| 401 | { |
| 402 | struct target_section *old_value; |
| 403 | int old_count; |
| 404 | int new_count; |
| 405 | |
| 406 | old_value = table->sections; |
| 407 | old_count = table->sections_end - table->sections; |
| 408 | |
| 409 | new_count = num_added + old_count; |
| 410 | |
| 411 | if (new_count) |
| 412 | { |
| 413 | table->sections = xrealloc (table->sections, |
| 414 | sizeof (struct target_section) * new_count); |
| 415 | table->sections_end = table->sections + new_count; |
| 416 | } |
| 417 | else |
| 418 | { |
| 419 | xfree (table->sections); |
| 420 | table->sections = table->sections_end = NULL; |
| 421 | } |
| 422 | |
| 423 | return old_count; |
| 424 | } |
| 425 | |
| 426 | /* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR. |
| 427 | Returns 0 if OK, 1 on error. */ |
| 428 | |
| 429 | int |
| 430 | build_section_table (struct bfd *some_bfd, struct target_section **start, |
| 431 | struct target_section **end) |
| 432 | { |
| 433 | unsigned count; |
| 434 | |
| 435 | count = bfd_count_sections (some_bfd); |
| 436 | if (*start) |
| 437 | xfree (* start); |
| 438 | *start = (struct target_section *) xmalloc (count * sizeof (**start)); |
| 439 | *end = *start; |
| 440 | bfd_map_over_sections (some_bfd, add_to_section_table, (char *) end); |
| 441 | if (*end > *start + count) |
| 442 | internal_error (__FILE__, __LINE__, |
| 443 | _("failed internal consistency check")); |
| 444 | /* We could realloc the table, but it probably loses for most files. */ |
| 445 | return 0; |
| 446 | } |
| 447 | |
| 448 | /* Add the sections array defined by [SECTIONS..SECTIONS_END[ to the |
| 449 | current set of target sections. */ |
| 450 | |
| 451 | void |
| 452 | add_target_sections (struct target_section *sections, |
| 453 | struct target_section *sections_end) |
| 454 | { |
| 455 | int count; |
| 456 | struct target_section_table *table = current_target_sections; |
| 457 | |
| 458 | count = sections_end - sections; |
| 459 | |
| 460 | if (count > 0) |
| 461 | { |
| 462 | int space = resize_section_table (table, count); |
| 463 | |
| 464 | memcpy (table->sections + space, |
| 465 | sections, count * sizeof (sections[0])); |
| 466 | |
| 467 | /* If these are the first file sections we can provide memory |
| 468 | from, push the file_stratum target. */ |
| 469 | if (!using_exec_ops) |
| 470 | { |
| 471 | using_exec_ops = 1; |
| 472 | push_target (&exec_ops); |
| 473 | } |
| 474 | } |
| 475 | } |
| 476 | |
| 477 | /* Remove all target sections taken from ABFD. */ |
| 478 | |
| 479 | void |
| 480 | remove_target_sections (bfd *abfd) |
| 481 | { |
| 482 | struct target_section *src, *dest; |
| 483 | struct target_section_table *table = current_target_sections; |
| 484 | |
| 485 | dest = table->sections; |
| 486 | for (src = table->sections; src < table->sections_end; src++) |
| 487 | if (src->bfd != abfd) |
| 488 | { |
| 489 | /* Keep this section. */ |
| 490 | if (dest < src) |
| 491 | *dest = *src; |
| 492 | dest++; |
| 493 | } |
| 494 | |
| 495 | /* If we've dropped any sections, resize the section table. */ |
| 496 | if (dest < src) |
| 497 | { |
| 498 | int old_count; |
| 499 | |
| 500 | old_count = resize_section_table (table, dest - src); |
| 501 | |
| 502 | /* If we don't have any more sections to read memory from, |
| 503 | remove the file_stratum target from the stack. */ |
| 504 | if (old_count + (dest - src) == 0) |
| 505 | { |
| 506 | struct program_space *pspace; |
| 507 | |
| 508 | ALL_PSPACES (pspace) |
| 509 | if (pspace->target_sections.sections |
| 510 | != pspace->target_sections.sections_end) |
| 511 | return; |
| 512 | |
| 513 | unpush_target (&exec_ops); |
| 514 | } |
| 515 | } |
| 516 | } |
| 517 | |
| 518 | \f |
| 519 | static void |
| 520 | bfdsec_to_vmap (struct bfd *abfd, struct bfd_section *sect, void *arg3) |
| 521 | { |
| 522 | struct vmap_and_bfd *vmap_bfd = (struct vmap_and_bfd *) arg3; |
| 523 | struct vmap *vp; |
| 524 | |
| 525 | vp = vmap_bfd->pvmap; |
| 526 | |
| 527 | if ((bfd_get_section_flags (abfd, sect) & SEC_LOAD) == 0) |
| 528 | return; |
| 529 | |
| 530 | if (strcmp (bfd_section_name (abfd, sect), ".text") == 0) |
| 531 | { |
| 532 | vp->tstart = bfd_section_vma (abfd, sect); |
| 533 | vp->tend = vp->tstart + bfd_section_size (abfd, sect); |
| 534 | vp->tvma = bfd_section_vma (abfd, sect); |
| 535 | vp->toffs = sect->filepos; |
| 536 | } |
| 537 | else if (strcmp (bfd_section_name (abfd, sect), ".data") == 0) |
| 538 | { |
| 539 | vp->dstart = bfd_section_vma (abfd, sect); |
| 540 | vp->dend = vp->dstart + bfd_section_size (abfd, sect); |
| 541 | vp->dvma = bfd_section_vma (abfd, sect); |
| 542 | } |
| 543 | /* Silently ignore other types of sections. (FIXME?) */ |
| 544 | } |
| 545 | |
| 546 | /* Make a vmap for ABFD which might be a member of the archive ARCH. |
| 547 | Return the new vmap. */ |
| 548 | |
| 549 | struct vmap * |
| 550 | map_vmap (bfd *abfd, bfd *arch) |
| 551 | { |
| 552 | struct vmap_and_bfd vmap_bfd; |
| 553 | struct vmap *vp, **vpp; |
| 554 | |
| 555 | vp = (struct vmap *) xmalloc (sizeof (*vp)); |
| 556 | memset ((char *) vp, '\0', sizeof (*vp)); |
| 557 | vp->nxt = 0; |
| 558 | vp->bfd = abfd; |
| 559 | vp->name = bfd_get_filename (arch ? arch : abfd); |
| 560 | vp->member = arch ? bfd_get_filename (abfd) : ""; |
| 561 | |
| 562 | vmap_bfd.pbfd = arch; |
| 563 | vmap_bfd.pvmap = vp; |
| 564 | bfd_map_over_sections (abfd, bfdsec_to_vmap, &vmap_bfd); |
| 565 | |
| 566 | /* Find the end of the list and append. */ |
| 567 | for (vpp = &vmap; *vpp; vpp = &(*vpp)->nxt) |
| 568 | ; |
| 569 | *vpp = vp; |
| 570 | |
| 571 | return vp; |
| 572 | } |
| 573 | \f |
| 574 | |
| 575 | int |
| 576 | section_table_xfer_memory_partial (gdb_byte *readbuf, const gdb_byte *writebuf, |
| 577 | ULONGEST offset, LONGEST len, |
| 578 | struct target_section *sections, |
| 579 | struct target_section *sections_end, |
| 580 | const char *section_name) |
| 581 | { |
| 582 | int res; |
| 583 | struct target_section *p; |
| 584 | ULONGEST memaddr = offset; |
| 585 | ULONGEST memend = memaddr + len; |
| 586 | |
| 587 | if (len <= 0) |
| 588 | internal_error (__FILE__, __LINE__, |
| 589 | _("failed internal consistency check")); |
| 590 | |
| 591 | for (p = sections; p < sections_end; p++) |
| 592 | { |
| 593 | if (section_name && strcmp (section_name, p->the_bfd_section->name) != 0) |
| 594 | continue; /* not the section we need. */ |
| 595 | if (memaddr >= p->addr) |
| 596 | { |
| 597 | if (memend <= p->endaddr) |
| 598 | { |
| 599 | /* Entire transfer is within this section. */ |
| 600 | if (writebuf) |
| 601 | res = bfd_set_section_contents (p->bfd, p->the_bfd_section, |
| 602 | writebuf, memaddr - p->addr, |
| 603 | len); |
| 604 | else |
| 605 | res = bfd_get_section_contents (p->bfd, p->the_bfd_section, |
| 606 | readbuf, memaddr - p->addr, |
| 607 | len); |
| 608 | return (res != 0) ? len : 0; |
| 609 | } |
| 610 | else if (memaddr >= p->endaddr) |
| 611 | { |
| 612 | /* This section ends before the transfer starts. */ |
| 613 | continue; |
| 614 | } |
| 615 | else |
| 616 | { |
| 617 | /* This section overlaps the transfer. Just do half. */ |
| 618 | len = p->endaddr - memaddr; |
| 619 | if (writebuf) |
| 620 | res = bfd_set_section_contents (p->bfd, p->the_bfd_section, |
| 621 | writebuf, memaddr - p->addr, |
| 622 | len); |
| 623 | else |
| 624 | res = bfd_get_section_contents (p->bfd, p->the_bfd_section, |
| 625 | readbuf, memaddr - p->addr, |
| 626 | len); |
| 627 | return (res != 0) ? len : 0; |
| 628 | } |
| 629 | } |
| 630 | } |
| 631 | |
| 632 | return 0; /* We can't help. */ |
| 633 | } |
| 634 | |
| 635 | struct target_section_table * |
| 636 | exec_get_section_table (struct target_ops *ops) |
| 637 | { |
| 638 | return current_target_sections; |
| 639 | } |
| 640 | |
| 641 | static LONGEST |
| 642 | exec_xfer_partial (struct target_ops *ops, enum target_object object, |
| 643 | const char *annex, gdb_byte *readbuf, |
| 644 | const gdb_byte *writebuf, |
| 645 | ULONGEST offset, LONGEST len) |
| 646 | { |
| 647 | struct target_section_table *table = target_get_section_table (ops); |
| 648 | |
| 649 | if (object == TARGET_OBJECT_MEMORY) |
| 650 | return section_table_xfer_memory_partial (readbuf, writebuf, |
| 651 | offset, len, |
| 652 | table->sections, |
| 653 | table->sections_end, |
| 654 | NULL); |
| 655 | else |
| 656 | return -1; |
| 657 | } |
| 658 | \f |
| 659 | |
| 660 | void |
| 661 | print_section_info (struct target_section_table *t, bfd *abfd) |
| 662 | { |
| 663 | struct gdbarch *gdbarch = gdbarch_from_bfd (abfd); |
| 664 | struct target_section *p; |
| 665 | /* FIXME: 16 is not wide enough when gdbarch_addr_bit > 64. */ |
| 666 | int wid = gdbarch_addr_bit (gdbarch) <= 32 ? 8 : 16; |
| 667 | |
| 668 | printf_filtered ("\t`%s', ", bfd_get_filename (abfd)); |
| 669 | wrap_here (" "); |
| 670 | printf_filtered (_("file type %s.\n"), bfd_get_target (abfd)); |
| 671 | if (abfd == exec_bfd) |
| 672 | { |
| 673 | /* gcc-3.4 does not like the initialization in |
| 674 | <p == t->sections_end>. */ |
| 675 | bfd_vma displacement = 0; |
| 676 | bfd_vma entry_point; |
| 677 | |
| 678 | for (p = t->sections; p < t->sections_end; p++) |
| 679 | { |
| 680 | asection *asect = p->the_bfd_section; |
| 681 | |
| 682 | if ((bfd_get_section_flags (abfd, asect) & (SEC_ALLOC | SEC_LOAD)) |
| 683 | != (SEC_ALLOC | SEC_LOAD)) |
| 684 | continue; |
| 685 | |
| 686 | if (bfd_get_section_vma (abfd, asect) <= abfd->start_address |
| 687 | && abfd->start_address < (bfd_get_section_vma (abfd, asect) |
| 688 | + bfd_get_section_size (asect))) |
| 689 | { |
| 690 | displacement = p->addr - bfd_get_section_vma (abfd, asect); |
| 691 | break; |
| 692 | } |
| 693 | } |
| 694 | if (p == t->sections_end) |
| 695 | warning (_("Cannot find section for the entry point of %s.\n"), |
| 696 | bfd_get_filename (abfd)); |
| 697 | |
| 698 | entry_point = gdbarch_addr_bits_remove (gdbarch, |
| 699 | bfd_get_start_address (abfd) |
| 700 | + displacement); |
| 701 | printf_filtered (_("\tEntry point: %s\n"), |
| 702 | paddress (gdbarch, entry_point)); |
| 703 | } |
| 704 | for (p = t->sections; p < t->sections_end; p++) |
| 705 | { |
| 706 | printf_filtered ("\t%s", hex_string_custom (p->addr, wid)); |
| 707 | printf_filtered (" - %s", hex_string_custom (p->endaddr, wid)); |
| 708 | |
| 709 | /* FIXME: A format of "08l" is not wide enough for file offsets |
| 710 | larger than 4GB. OTOH, making it "016l" isn't desirable either |
| 711 | since most output will then be much wider than necessary. It |
| 712 | may make sense to test the size of the file and choose the |
| 713 | format string accordingly. */ |
| 714 | /* FIXME: i18n: Need to rewrite this sentence. */ |
| 715 | if (info_verbose) |
| 716 | printf_filtered (" @ %s", |
| 717 | hex_string_custom (p->the_bfd_section->filepos, 8)); |
| 718 | printf_filtered (" is %s", bfd_section_name (p->bfd, |
| 719 | p->the_bfd_section)); |
| 720 | if (p->bfd != abfd) |
| 721 | printf_filtered (" in %s", bfd_get_filename (p->bfd)); |
| 722 | printf_filtered ("\n"); |
| 723 | } |
| 724 | } |
| 725 | |
| 726 | static void |
| 727 | exec_files_info (struct target_ops *t) |
| 728 | { |
| 729 | print_section_info (current_target_sections, exec_bfd); |
| 730 | |
| 731 | if (vmap) |
| 732 | { |
| 733 | int addr_size = gdbarch_addr_bit (target_gdbarch) / 8; |
| 734 | struct vmap *vp; |
| 735 | |
| 736 | printf_unfiltered (_("\tMapping info for file `%s'.\n"), vmap->name); |
| 737 | printf_unfiltered ("\t %*s %*s %*s %*s %8.8s %s\n", |
| 738 | addr_size * 2, "tstart", |
| 739 | addr_size * 2, "tend", |
| 740 | addr_size * 2, "dstart", |
| 741 | addr_size * 2, "dend", |
| 742 | "section", |
| 743 | "file(member)"); |
| 744 | |
| 745 | for (vp = vmap; vp; vp = vp->nxt) |
| 746 | printf_unfiltered ("\t0x%s 0x%s 0x%s 0x%s %s%s%s%s\n", |
| 747 | phex (vp->tstart, addr_size), |
| 748 | phex (vp->tend, addr_size), |
| 749 | phex (vp->dstart, addr_size), |
| 750 | phex (vp->dend, addr_size), |
| 751 | vp->name, |
| 752 | *vp->member ? "(" : "", vp->member, |
| 753 | *vp->member ? ")" : ""); |
| 754 | } |
| 755 | } |
| 756 | |
| 757 | static void |
| 758 | set_section_command (char *args, int from_tty) |
| 759 | { |
| 760 | struct target_section *p; |
| 761 | char *secname; |
| 762 | unsigned seclen; |
| 763 | unsigned long secaddr; |
| 764 | char secprint[100]; |
| 765 | long offset; |
| 766 | struct target_section_table *table; |
| 767 | |
| 768 | if (args == 0) |
| 769 | error (_("Must specify section name and its virtual address")); |
| 770 | |
| 771 | /* Parse out section name. */ |
| 772 | for (secname = args; !isspace (*args); args++); |
| 773 | seclen = args - secname; |
| 774 | |
| 775 | /* Parse out new virtual address. */ |
| 776 | secaddr = parse_and_eval_address (args); |
| 777 | |
| 778 | table = current_target_sections; |
| 779 | for (p = table->sections; p < table->sections_end; p++) |
| 780 | { |
| 781 | if (!strncmp (secname, bfd_section_name (exec_bfd, |
| 782 | p->the_bfd_section), seclen) |
| 783 | && bfd_section_name (exec_bfd, p->the_bfd_section)[seclen] == '\0') |
| 784 | { |
| 785 | offset = secaddr - p->addr; |
| 786 | p->addr += offset; |
| 787 | p->endaddr += offset; |
| 788 | if (from_tty) |
| 789 | exec_files_info (&exec_ops); |
| 790 | return; |
| 791 | } |
| 792 | } |
| 793 | if (seclen >= sizeof (secprint)) |
| 794 | seclen = sizeof (secprint) - 1; |
| 795 | strncpy (secprint, secname, seclen); |
| 796 | secprint[seclen] = '\0'; |
| 797 | error (_("Section %s not found"), secprint); |
| 798 | } |
| 799 | |
| 800 | /* If we can find a section in FILENAME with BFD index INDEX, adjust |
| 801 | it to ADDRESS. */ |
| 802 | |
| 803 | void |
| 804 | exec_set_section_address (const char *filename, int index, CORE_ADDR address) |
| 805 | { |
| 806 | struct target_section *p; |
| 807 | struct target_section_table *table; |
| 808 | |
| 809 | table = current_target_sections; |
| 810 | for (p = table->sections; p < table->sections_end; p++) |
| 811 | { |
| 812 | if (strcmp (filename, p->bfd->filename) == 0 |
| 813 | && index == p->the_bfd_section->index) |
| 814 | { |
| 815 | p->endaddr += address - p->addr; |
| 816 | p->addr = address; |
| 817 | } |
| 818 | } |
| 819 | } |
| 820 | |
| 821 | /* If mourn is being called in all the right places, this could be say |
| 822 | `gdb internal error' (since generic_mourn calls |
| 823 | breakpoint_init_inferior). */ |
| 824 | |
| 825 | static int |
| 826 | ignore (struct gdbarch *gdbarch, struct bp_target_info *bp_tgt) |
| 827 | { |
| 828 | return 0; |
| 829 | } |
| 830 | |
| 831 | static int |
| 832 | exec_has_memory (struct target_ops *ops) |
| 833 | { |
| 834 | /* We can provide memory if we have any file/target sections to read |
| 835 | from. */ |
| 836 | return (current_target_sections->sections |
| 837 | != current_target_sections->sections_end); |
| 838 | } |
| 839 | |
| 840 | /* Find mapped memory. */ |
| 841 | |
| 842 | extern void |
| 843 | exec_set_find_memory_regions (int (*func) (find_memory_region_ftype, void *)) |
| 844 | { |
| 845 | exec_ops.to_find_memory_regions = func; |
| 846 | } |
| 847 | |
| 848 | static char *exec_make_note_section (bfd *, int *); |
| 849 | |
| 850 | /* Fill in the exec file target vector. Very few entries need to be |
| 851 | defined. */ |
| 852 | |
| 853 | static void |
| 854 | init_exec_ops (void) |
| 855 | { |
| 856 | exec_ops.to_shortname = "exec"; |
| 857 | exec_ops.to_longname = "Local exec file"; |
| 858 | exec_ops.to_doc = "Use an executable file as a target.\n\ |
| 859 | Specify the filename of the executable file."; |
| 860 | exec_ops.to_open = exec_open; |
| 861 | exec_ops.to_close = exec_close_1; |
| 862 | exec_ops.to_attach = find_default_attach; |
| 863 | exec_ops.to_xfer_partial = exec_xfer_partial; |
| 864 | exec_ops.to_get_section_table = exec_get_section_table; |
| 865 | exec_ops.to_files_info = exec_files_info; |
| 866 | exec_ops.to_insert_breakpoint = ignore; |
| 867 | exec_ops.to_remove_breakpoint = ignore; |
| 868 | exec_ops.to_create_inferior = find_default_create_inferior; |
| 869 | exec_ops.to_stratum = file_stratum; |
| 870 | exec_ops.to_has_memory = exec_has_memory; |
| 871 | exec_ops.to_make_corefile_notes = exec_make_note_section; |
| 872 | exec_ops.to_magic = OPS_MAGIC; |
| 873 | } |
| 874 | |
| 875 | void |
| 876 | _initialize_exec (void) |
| 877 | { |
| 878 | struct cmd_list_element *c; |
| 879 | |
| 880 | init_exec_ops (); |
| 881 | |
| 882 | if (!dbx_commands) |
| 883 | { |
| 884 | c = add_cmd ("file", class_files, file_command, _("\ |
| 885 | Use FILE as program to be debugged.\n\ |
| 886 | It is read for its symbols, for getting the contents of pure memory,\n\ |
| 887 | and it is the program executed when you use the `run' command.\n\ |
| 888 | If FILE cannot be found as specified, your execution directory path\n\ |
| 889 | ($PATH) is searched for a command of that name.\n\ |
| 890 | No arg means to have no executable file and no symbols."), &cmdlist); |
| 891 | set_cmd_completer (c, filename_completer); |
| 892 | } |
| 893 | |
| 894 | c = add_cmd ("exec-file", class_files, exec_file_command, _("\ |
| 895 | Use FILE as program for getting contents of pure memory.\n\ |
| 896 | If FILE cannot be found as specified, your execution directory path\n\ |
| 897 | is searched for a command of that name.\n\ |
| 898 | No arg means have no executable file."), &cmdlist); |
| 899 | set_cmd_completer (c, filename_completer); |
| 900 | |
| 901 | add_com ("section", class_files, set_section_command, _("\ |
| 902 | Change the base address of section SECTION of the exec file to ADDR.\n\ |
| 903 | This can be used if the exec file does not contain section addresses,\n\ |
| 904 | (such as in the a.out format), or when the addresses specified in the\n\ |
| 905 | file itself are wrong. Each section must be changed separately. The\n\ |
| 906 | ``info files'' command lists all the sections and their addresses.")); |
| 907 | |
| 908 | add_setshow_boolean_cmd ("write", class_support, &write_files, _("\ |
| 909 | Set writing into executable and core files."), _("\ |
| 910 | Show writing into executable and core files."), NULL, |
| 911 | NULL, |
| 912 | show_write_files, |
| 913 | &setlist, &showlist); |
| 914 | |
| 915 | add_target (&exec_ops); |
| 916 | } |
| 917 | |
| 918 | static char * |
| 919 | exec_make_note_section (bfd *obfd, int *note_size) |
| 920 | { |
| 921 | error (_("Can't create a corefile")); |
| 922 | } |