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 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 36 #include <fcntl.h> 37 #include "readline/readline.h" 38 #include "gdb_string.h" 39 40 #include "gdbcore.h" 41 42 #include <ctype.h> 43 #include "gdb_stat.h" 44 45 #include "xcoffsolib.h" 46 47 struct vmap *map_vmap (bfd *, bfd *); 48 49 void (*deprecated_file_changed_hook) (char *); 50 51 /* Prototypes for local functions */ 52 53 static void exec_close (int); 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 /* The Binary File Descriptor handle for the executable file. */ 70 71 bfd *exec_bfd = NULL; 72 long exec_bfd_mtime = 0; 73 74 /* GDB currently only supports a single symbol/address space for the 75 whole debug session. When that limitation is lifted, this global 76 goes away. */ 77 static struct target_section_table current_target_sections_1; 78 79 /* The set of target sections matching the sections mapped into the 80 current inferior's address space. */ 81 static struct target_section_table *current_target_sections 82 = ¤t_target_sections_1; 83 84 /* Whether to open exec and core files read-only or read-write. */ 85 86 int write_files = 0; 87 static void 88 show_write_files (struct ui_file *file, int from_tty, 89 struct cmd_list_element *c, const char *value) 90 { 91 fprintf_filtered (file, _("Writing into executable and core files is %s.\n"), 92 value); 93 } 94 95 96 struct vmap *vmap; 97 98 static void 99 exec_open (char *args, int from_tty) 100 { 101 target_preopen (from_tty); 102 exec_file_attach (args, from_tty); 103 } 104 105 /* Close and clear exec_bfd. If we end up with no target sections to 106 read memory from, this unpushes the exec_ops target. */ 107 108 static void 109 exec_close_1 (void) 110 { 111 if (exec_bfd) 112 { 113 bfd *abfd = exec_bfd; 114 char *name = bfd_get_filename (abfd); 115 116 if (!bfd_close (abfd)) 117 warning (_("cannot close \"%s\": %s"), 118 name, bfd_errmsg (bfd_get_error ())); 119 xfree (name); 120 121 /* Removing target sections may close the exec_ops target. 122 Clear exec_bfd before doing so to prevent recursion. */ 123 exec_bfd = NULL; 124 exec_bfd_mtime = 0; 125 126 remove_target_sections (abfd); 127 } 128 } 129 130 static void 131 exec_close (int quitting) 132 { 133 int need_symtab_cleanup = 0; 134 struct vmap *vp, *nxt; 135 136 for (nxt = vmap; nxt != NULL;) 137 { 138 vp = nxt; 139 nxt = vp->nxt; 140 141 /* if there is an objfile associated with this bfd, 142 free_objfile() will do proper cleanup of objfile *and* bfd. */ 143 144 if (vp->objfile) 145 { 146 free_objfile (vp->objfile); 147 need_symtab_cleanup = 1; 148 } 149 else if (vp->bfd != exec_bfd) 150 /* FIXME-leak: We should be freeing vp->name too, I think. */ 151 if (!bfd_close (vp->bfd)) 152 warning (_("cannot close \"%s\": %s"), 153 vp->name, bfd_errmsg (bfd_get_error ())); 154 155 /* FIXME: This routine is #if 0'd in symfile.c. What should we 156 be doing here? Should we just free everything in 157 vp->objfile->symtabs? Should free_objfile do that? 158 FIXME-as-well: free_objfile already free'd vp->name, so it isn't 159 valid here. */ 160 free_named_symtabs (vp->name); 161 xfree (vp); 162 } 163 164 vmap = NULL; 165 166 /* Delete all target sections. */ 167 resize_section_table 168 (current_target_sections, 169 -resize_section_table (current_target_sections, 0)); 170 171 /* Remove exec file. */ 172 exec_close_1 (); 173 } 174 175 void 176 exec_file_clear (int from_tty) 177 { 178 /* Remove exec file. */ 179 exec_close_1 (); 180 181 if (from_tty) 182 printf_unfiltered (_("No executable file now.\n")); 183 } 184 185 /* Set FILENAME as the new exec file. 186 187 This function is intended to be behave essentially the same 188 as exec_file_command, except that the latter will detect when 189 a target is being debugged, and will ask the user whether it 190 should be shut down first. (If the answer is "no", then the 191 new file is ignored.) 192 193 This file is used by exec_file_command, to do the work of opening 194 and processing the exec file after any prompting has happened. 195 196 And, it is used by child_attach, when the attach command was 197 given a pid but not a exec pathname, and the attach command could 198 figure out the pathname from the pid. (In this case, we shouldn't 199 ask the user whether the current target should be shut down -- 200 we're supplying the exec pathname late for good reason.) */ 201 202 void 203 exec_file_attach (char *filename, int from_tty) 204 { 205 /* Remove any previous exec file. */ 206 exec_close_1 (); 207 208 /* Now open and digest the file the user requested, if any. */ 209 210 if (!filename) 211 { 212 if (from_tty) 213 printf_unfiltered (_("No executable file now.\n")); 214 215 set_gdbarch_from_file (NULL); 216 } 217 else 218 { 219 struct cleanup *cleanups; 220 char *scratch_pathname; 221 int scratch_chan; 222 struct target_section *sections = NULL, *sections_end = NULL; 223 224 scratch_chan = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST, filename, 225 write_files ? O_RDWR | O_BINARY : O_RDONLY | O_BINARY, 226 &scratch_pathname); 227 #if defined(__GO32__) || defined(_WIN32) || defined(__CYGWIN__) 228 if (scratch_chan < 0) 229 { 230 char *exename = alloca (strlen (filename) + 5); 231 strcat (strcpy (exename, filename), ".exe"); 232 scratch_chan = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST, exename, 233 write_files ? O_RDWR | O_BINARY : O_RDONLY | O_BINARY, 234 &scratch_pathname); 235 } 236 #endif 237 if (scratch_chan < 0) 238 perror_with_name (filename); 239 exec_bfd = bfd_fopen (scratch_pathname, gnutarget, 240 write_files ? FOPEN_RUB : FOPEN_RB, 241 scratch_chan); 242 243 if (!exec_bfd) 244 { 245 close (scratch_chan); 246 error (_("\"%s\": could not open as an executable file: %s"), 247 scratch_pathname, bfd_errmsg (bfd_get_error ())); 248 } 249 250 /* At this point, scratch_pathname and exec_bfd->name both point to the 251 same malloc'd string. However exec_close() will attempt to free it 252 via the exec_bfd->name pointer, so we need to make another copy and 253 leave exec_bfd as the new owner of the original copy. */ 254 scratch_pathname = xstrdup (scratch_pathname); 255 cleanups = make_cleanup (xfree, scratch_pathname); 256 257 if (!bfd_check_format (exec_bfd, bfd_object)) 258 { 259 /* Make sure to close exec_bfd, or else "run" might try to use 260 it. */ 261 exec_close_1 (); 262 error (_("\"%s\": not in executable format: %s"), 263 scratch_pathname, bfd_errmsg (bfd_get_error ())); 264 } 265 266 /* FIXME - This should only be run for RS6000, but the ifdef is a poor 267 way to accomplish. */ 268 #ifdef DEPRECATED_IBM6000_TARGET 269 /* Setup initial vmap. */ 270 271 map_vmap (exec_bfd, 0); 272 if (vmap == NULL) 273 { 274 /* Make sure to close exec_bfd, or else "run" might try to use 275 it. */ 276 exec_close_1 (); 277 error (_("\"%s\": can't find the file sections: %s"), 278 scratch_pathname, bfd_errmsg (bfd_get_error ())); 279 } 280 #endif /* DEPRECATED_IBM6000_TARGET */ 281 282 if (build_section_table (exec_bfd, §ions, §ions_end)) 283 { 284 /* Make sure to close exec_bfd, or else "run" might try to use 285 it. */ 286 exec_close_1 (); 287 error (_("\"%s\": can't find the file sections: %s"), 288 scratch_pathname, bfd_errmsg (bfd_get_error ())); 289 } 290 291 exec_bfd_mtime = bfd_get_mtime (exec_bfd); 292 293 validate_files (); 294 295 set_gdbarch_from_file (exec_bfd); 296 297 /* Add the executable's sections to the current address spaces' 298 list of sections. */ 299 add_target_sections (sections, sections_end); 300 xfree (sections); 301 302 /* Tell display code (if any) about the changed file name. */ 303 if (deprecated_exec_file_display_hook) 304 (*deprecated_exec_file_display_hook) (filename); 305 306 do_cleanups (cleanups); 307 } 308 bfd_cache_close_all (); 309 observer_notify_executable_changed (); 310 } 311 312 /* Process the first arg in ARGS as the new exec file. 313 314 Note that we have to explicitly ignore additional args, since we can 315 be called from file_command(), which also calls symbol_file_command() 316 which can take multiple args. 317 318 If ARGS is NULL, we just want to close the exec file. */ 319 320 static void 321 exec_file_command (char *args, int from_tty) 322 { 323 char **argv; 324 char *filename; 325 326 if (from_tty && target_has_execution 327 && !query (_("A program is being debugged already.\n" 328 "Are you sure you want to change the file? "))) 329 error (_("File not changed.")); 330 331 if (args) 332 { 333 struct cleanup *cleanups; 334 335 /* Scan through the args and pick up the first non option arg 336 as the filename. */ 337 338 argv = gdb_buildargv (args); 339 cleanups = make_cleanup_freeargv (argv); 340 341 for (; (*argv != NULL) && (**argv == '-'); argv++) 342 {; 343 } 344 if (*argv == NULL) 345 error (_("No executable file name was specified")); 346 347 filename = tilde_expand (*argv); 348 make_cleanup (xfree, filename); 349 exec_file_attach (filename, from_tty); 350 351 do_cleanups (cleanups); 352 } 353 else 354 exec_file_attach (NULL, from_tty); 355 } 356 357 /* Set both the exec file and the symbol file, in one command. 358 What a novelty. Why did GDB go through four major releases before this 359 command was added? */ 360 361 static void 362 file_command (char *arg, int from_tty) 363 { 364 /* FIXME, if we lose on reading the symbol file, we should revert 365 the exec file, but that's rough. */ 366 exec_file_command (arg, from_tty); 367 symbol_file_command (arg, from_tty); 368 if (deprecated_file_changed_hook) 369 deprecated_file_changed_hook (arg); 370 } 371 372 373 /* Locate all mappable sections of a BFD file. 374 table_pp_char is a char * to get it through bfd_map_over_sections; 375 we cast it back to its proper type. */ 376 377 static void 378 add_to_section_table (bfd *abfd, struct bfd_section *asect, 379 void *table_pp_char) 380 { 381 struct target_section **table_pp = (struct target_section **) table_pp_char; 382 flagword aflag; 383 384 /* Check the section flags, but do not discard zero-length sections, since 385 some symbols may still be attached to this section. For instance, we 386 encountered on sparc-solaris 2.10 a shared library with an empty .bss 387 section to which a symbol named "_end" was attached. The address 388 of this symbol still needs to be relocated. */ 389 aflag = bfd_get_section_flags (abfd, asect); 390 if (!(aflag & SEC_ALLOC)) 391 return; 392 393 (*table_pp)->bfd = abfd; 394 (*table_pp)->the_bfd_section = asect; 395 (*table_pp)->addr = bfd_section_vma (abfd, asect); 396 (*table_pp)->endaddr = (*table_pp)->addr + bfd_section_size (abfd, asect); 397 (*table_pp)++; 398 } 399 400 int 401 resize_section_table (struct target_section_table *table, int num_added) 402 { 403 struct target_section *old_value; 404 int old_count; 405 int new_count; 406 407 old_value = table->sections; 408 old_count = table->sections_end - table->sections; 409 410 new_count = num_added + old_count; 411 412 if (new_count) 413 { 414 table->sections = xrealloc (table->sections, 415 sizeof (struct target_section) * new_count); 416 table->sections_end = table->sections + new_count; 417 } 418 else 419 { 420 xfree (table->sections); 421 table->sections = table->sections_end = NULL; 422 } 423 424 return old_count; 425 } 426 427 /* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR. 428 Returns 0 if OK, 1 on error. */ 429 430 int 431 build_section_table (struct bfd *some_bfd, struct target_section **start, 432 struct target_section **end) 433 { 434 unsigned count; 435 436 count = bfd_count_sections (some_bfd); 437 if (*start) 438 xfree (* start); 439 *start = (struct target_section *) xmalloc (count * sizeof (**start)); 440 *end = *start; 441 bfd_map_over_sections (some_bfd, add_to_section_table, (char *) end); 442 if (*end > *start + count) 443 internal_error (__FILE__, __LINE__, _("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 memcpy (table->sections + space, 464 sections, count * sizeof (sections[0])); 465 466 /* If these are the first file sections we can provide memory 467 from, push the file_stratum target. */ 468 if (space == 0) 469 push_target (&exec_ops); 470 } 471 } 472 473 /* Remove all target sections taken from ABFD. */ 474 475 void 476 remove_target_sections (bfd *abfd) 477 { 478 struct target_section *src, *dest; 479 480 struct target_section_table *table = current_target_sections; 481 482 dest = table->sections; 483 for (src = table->sections; src < table->sections_end; src++) 484 if (src->bfd != abfd) 485 { 486 /* Keep this section. */ 487 if (dest < src) 488 *dest = *src; 489 dest++; 490 } 491 492 /* If we've dropped any sections, resize the section table. */ 493 if (dest < src) 494 { 495 int old_count; 496 497 old_count = resize_section_table (table, dest - src); 498 499 /* If we don't have any more sections to read memory from, 500 remove the file_stratum target from the stack. */ 501 if (old_count + (dest - src) == 0) 502 unpush_target (&exec_ops); 503 } 504 } 505 506 507 static void 508 bfdsec_to_vmap (struct bfd *abfd, struct bfd_section *sect, void *arg3) 509 { 510 struct vmap_and_bfd *vmap_bfd = (struct vmap_and_bfd *) arg3; 511 struct vmap *vp; 512 513 vp = vmap_bfd->pvmap; 514 515 if ((bfd_get_section_flags (abfd, sect) & SEC_LOAD) == 0) 516 return; 517 518 if (strcmp (bfd_section_name (abfd, sect), ".text") == 0) 519 { 520 vp->tstart = bfd_section_vma (abfd, sect); 521 vp->tend = vp->tstart + bfd_section_size (abfd, sect); 522 vp->tvma = bfd_section_vma (abfd, sect); 523 vp->toffs = sect->filepos; 524 } 525 else if (strcmp (bfd_section_name (abfd, sect), ".data") == 0) 526 { 527 vp->dstart = bfd_section_vma (abfd, sect); 528 vp->dend = vp->dstart + bfd_section_size (abfd, sect); 529 vp->dvma = bfd_section_vma (abfd, sect); 530 } 531 /* Silently ignore other types of sections. (FIXME?) */ 532 } 533 534 /* Make a vmap for ABFD which might be a member of the archive ARCH. 535 Return the new vmap. */ 536 537 struct vmap * 538 map_vmap (bfd *abfd, bfd *arch) 539 { 540 struct vmap_and_bfd vmap_bfd; 541 struct vmap *vp, **vpp; 542 543 vp = (struct vmap *) xmalloc (sizeof (*vp)); 544 memset ((char *) vp, '\0', sizeof (*vp)); 545 vp->nxt = 0; 546 vp->bfd = abfd; 547 vp->name = bfd_get_filename (arch ? arch : abfd); 548 vp->member = arch ? bfd_get_filename (abfd) : ""; 549 550 vmap_bfd.pbfd = arch; 551 vmap_bfd.pvmap = vp; 552 bfd_map_over_sections (abfd, bfdsec_to_vmap, &vmap_bfd); 553 554 /* Find the end of the list and append. */ 555 for (vpp = &vmap; *vpp; vpp = &(*vpp)->nxt) 556 ; 557 *vpp = vp; 558 559 return vp; 560 } 561 562 563 int 564 section_table_xfer_memory_partial (gdb_byte *readbuf, const gdb_byte *writebuf, 565 ULONGEST offset, LONGEST len, 566 struct target_section *sections, 567 struct target_section *sections_end, 568 const char *section_name) 569 { 570 int res; 571 struct target_section *p; 572 ULONGEST memaddr = offset; 573 ULONGEST memend = memaddr + len; 574 575 if (len <= 0) 576 internal_error (__FILE__, __LINE__, _("failed internal consistency check")); 577 578 for (p = sections; p < sections_end; p++) 579 { 580 if (section_name && strcmp (section_name, p->the_bfd_section->name) != 0) 581 continue; /* not the section we need */ 582 if (memaddr >= p->addr) 583 { 584 if (memend <= p->endaddr) 585 { 586 /* Entire transfer is within this section. */ 587 if (writebuf) 588 res = bfd_set_section_contents (p->bfd, p->the_bfd_section, 589 writebuf, memaddr - p->addr, 590 len); 591 else 592 res = bfd_get_section_contents (p->bfd, p->the_bfd_section, 593 readbuf, memaddr - p->addr, 594 len); 595 return (res != 0) ? len : 0; 596 } 597 else if (memaddr >= p->endaddr) 598 { 599 /* This section ends before the transfer starts. */ 600 continue; 601 } 602 else 603 { 604 /* This section overlaps the transfer. Just do half. */ 605 len = p->endaddr - memaddr; 606 if (writebuf) 607 res = bfd_set_section_contents (p->bfd, p->the_bfd_section, 608 writebuf, memaddr - p->addr, 609 len); 610 else 611 res = bfd_get_section_contents (p->bfd, p->the_bfd_section, 612 readbuf, memaddr - p->addr, 613 len); 614 return (res != 0) ? len : 0; 615 } 616 } 617 } 618 619 return 0; /* We can't help */ 620 } 621 622 struct target_section_table * 623 exec_get_section_table (struct target_ops *ops) 624 { 625 return current_target_sections; 626 } 627 628 static LONGEST 629 exec_xfer_partial (struct target_ops *ops, enum target_object object, 630 const char *annex, gdb_byte *readbuf, 631 const gdb_byte *writebuf, 632 ULONGEST offset, LONGEST len) 633 { 634 struct target_section_table *table = target_get_section_table (ops); 635 636 if (object == TARGET_OBJECT_MEMORY) 637 return section_table_xfer_memory_partial (readbuf, writebuf, 638 offset, len, 639 table->sections, 640 table->sections_end, 641 NULL); 642 else 643 return -1; 644 } 645 646 647 void 648 print_section_info (struct target_section_table *t, bfd *abfd) 649 { 650 struct gdbarch *gdbarch = gdbarch_from_bfd (abfd); 651 struct target_section *p; 652 /* FIXME: 16 is not wide enough when gdbarch_addr_bit > 64. */ 653 int wid = gdbarch_addr_bit (gdbarch) <= 32 ? 8 : 16; 654 655 printf_filtered ("\t`%s', ", bfd_get_filename (abfd)); 656 wrap_here (" "); 657 printf_filtered (_("file type %s.\n"), bfd_get_target (abfd)); 658 if (abfd == exec_bfd) 659 printf_filtered (_("\tEntry point: %s\n"), 660 paddress (gdbarch, bfd_get_start_address (abfd))); 661 for (p = t->sections; p < t->sections_end; p++) 662 { 663 printf_filtered ("\t%s", hex_string_custom (p->addr, wid)); 664 printf_filtered (" - %s", hex_string_custom (p->endaddr, wid)); 665 666 /* FIXME: A format of "08l" is not wide enough for file offsets 667 larger than 4GB. OTOH, making it "016l" isn't desirable either 668 since most output will then be much wider than necessary. It 669 may make sense to test the size of the file and choose the 670 format string accordingly. */ 671 /* FIXME: i18n: Need to rewrite this sentence. */ 672 if (info_verbose) 673 printf_filtered (" @ %s", 674 hex_string_custom (p->the_bfd_section->filepos, 8)); 675 printf_filtered (" is %s", bfd_section_name (p->bfd, p->the_bfd_section)); 676 if (p->bfd != abfd) 677 printf_filtered (" in %s", bfd_get_filename (p->bfd)); 678 printf_filtered ("\n"); 679 } 680 } 681 682 static void 683 exec_files_info (struct target_ops *t) 684 { 685 print_section_info (current_target_sections, exec_bfd); 686 687 if (vmap) 688 { 689 int addr_size = gdbarch_addr_bit (target_gdbarch) / 8; 690 struct vmap *vp; 691 692 printf_unfiltered (_("\tMapping info for file `%s'.\n"), vmap->name); 693 printf_unfiltered ("\t %*s %*s %*s %*s %8.8s %s\n", 694 addr_size * 2, "tstart", 695 addr_size * 2, "tend", 696 addr_size * 2, "dstart", 697 addr_size * 2, "dend", 698 "section", 699 "file(member)"); 700 701 for (vp = vmap; vp; vp = vp->nxt) 702 printf_unfiltered ("\t0x%s 0x%s 0x%s 0x%s %s%s%s%s\n", 703 phex (vp->tstart, addr_size), 704 phex (vp->tend, addr_size), 705 phex (vp->dstart, addr_size), 706 phex (vp->dend, addr_size), 707 vp->name, 708 *vp->member ? "(" : "", vp->member, 709 *vp->member ? ")" : ""); 710 } 711 } 712 713 static void 714 set_section_command (char *args, int from_tty) 715 { 716 struct target_section *p; 717 char *secname; 718 unsigned seclen; 719 unsigned long secaddr; 720 char secprint[100]; 721 long offset; 722 struct target_section_table *table; 723 724 if (args == 0) 725 error (_("Must specify section name and its virtual address")); 726 727 /* Parse out section name */ 728 for (secname = args; !isspace (*args); args++); 729 seclen = args - secname; 730 731 /* Parse out new virtual address */ 732 secaddr = parse_and_eval_address (args); 733 734 table = current_target_sections; 735 for (p = table->sections; p < table->sections_end; p++) 736 { 737 if (!strncmp (secname, bfd_section_name (exec_bfd, p->the_bfd_section), seclen) 738 && bfd_section_name (exec_bfd, p->the_bfd_section)[seclen] == '\0') 739 { 740 offset = secaddr - p->addr; 741 p->addr += offset; 742 p->endaddr += offset; 743 if (from_tty) 744 exec_files_info (&exec_ops); 745 return; 746 } 747 } 748 if (seclen >= sizeof (secprint)) 749 seclen = sizeof (secprint) - 1; 750 strncpy (secprint, secname, seclen); 751 secprint[seclen] = '\0'; 752 error (_("Section %s not found"), secprint); 753 } 754 755 /* If we can find a section in FILENAME with BFD index INDEX, adjust 756 it to ADDRESS. */ 757 758 void 759 exec_set_section_address (const char *filename, int index, CORE_ADDR address) 760 { 761 struct target_section *p; 762 struct target_section_table *table; 763 764 table = current_target_sections; 765 for (p = table->sections; p < table->sections_end; p++) 766 { 767 if (strcmp (filename, p->bfd->filename) == 0 768 && index == p->the_bfd_section->index) 769 { 770 p->endaddr += address - p->addr; 771 p->addr = address; 772 } 773 } 774 } 775 776 /* If mourn is being called in all the right places, this could be say 777 `gdb internal error' (since generic_mourn calls 778 breakpoint_init_inferior). */ 779 780 static int 781 ignore (struct gdbarch *gdbarch, struct bp_target_info *bp_tgt) 782 { 783 return 0; 784 } 785 786 static int 787 exec_has_memory (struct target_ops *ops) 788 { 789 /* We can provide memory if we have any file/target sections to read 790 from. */ 791 return (current_target_sections->sections 792 != current_target_sections->sections_end); 793 } 794 795 /* Find mapped memory. */ 796 797 extern void 798 exec_set_find_memory_regions (int (*func) (int (*) (CORE_ADDR, 799 unsigned long, 800 int, int, int, 801 void *), 802 void *)) 803 { 804 exec_ops.to_find_memory_regions = func; 805 } 806 807 static char *exec_make_note_section (bfd *, int *); 808 809 /* Fill in the exec file target vector. Very few entries need to be 810 defined. */ 811 812 static void 813 init_exec_ops (void) 814 { 815 exec_ops.to_shortname = "exec"; 816 exec_ops.to_longname = "Local exec file"; 817 exec_ops.to_doc = "Use an executable file as a target.\n\ 818 Specify the filename of the executable file."; 819 exec_ops.to_open = exec_open; 820 exec_ops.to_close = exec_close; 821 exec_ops.to_attach = find_default_attach; 822 exec_ops.to_xfer_partial = exec_xfer_partial; 823 exec_ops.to_get_section_table = exec_get_section_table; 824 exec_ops.to_files_info = exec_files_info; 825 exec_ops.to_insert_breakpoint = ignore; 826 exec_ops.to_remove_breakpoint = ignore; 827 exec_ops.to_create_inferior = find_default_create_inferior; 828 exec_ops.to_stratum = file_stratum; 829 exec_ops.to_has_memory = exec_has_memory; 830 exec_ops.to_make_corefile_notes = exec_make_note_section; 831 exec_ops.to_magic = OPS_MAGIC; 832 } 833 834 void 835 _initialize_exec (void) 836 { 837 struct cmd_list_element *c; 838 839 init_exec_ops (); 840 841 if (!dbx_commands) 842 { 843 c = add_cmd ("file", class_files, file_command, _("\ 844 Use FILE as program to be debugged.\n\ 845 It is read for its symbols, for getting the contents of pure memory,\n\ 846 and it is the program executed when you use the `run' command.\n\ 847 If FILE cannot be found as specified, your execution directory path\n\ 848 ($PATH) is searched for a command of that name.\n\ 849 No arg means to have no executable file and no symbols."), &cmdlist); 850 set_cmd_completer (c, filename_completer); 851 } 852 853 c = add_cmd ("exec-file", class_files, exec_file_command, _("\ 854 Use FILE as program for getting contents of pure memory.\n\ 855 If FILE cannot be found as specified, your execution directory path\n\ 856 is searched for a command of that name.\n\ 857 No arg means have no executable file."), &cmdlist); 858 set_cmd_completer (c, filename_completer); 859 860 add_com ("section", class_files, set_section_command, _("\ 861 Change the base address of section SECTION of the exec file to ADDR.\n\ 862 This can be used if the exec file does not contain section addresses,\n\ 863 (such as in the a.out format), or when the addresses specified in the\n\ 864 file itself are wrong. Each section must be changed separately. The\n\ 865 ``info files'' command lists all the sections and their addresses.")); 866 867 add_setshow_boolean_cmd ("write", class_support, &write_files, _("\ 868 Set writing into executable and core files."), _("\ 869 Show writing into executable and core files."), NULL, 870 NULL, 871 show_write_files, 872 &setlist, &showlist); 873 874 add_target (&exec_ops); 875 } 876 877 static char * 878 exec_make_note_section (bfd *obfd, int *note_size) 879 { 880 error (_("Can't create a corefile")); 881 } 882