1 /* Generic symbol file reading for the GNU debugger, GDB. 2 3 Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 4 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 5 Free Software Foundation, Inc. 6 7 Contributed by Cygnus Support, using pieces from other GDB modules. 8 9 This file is part of GDB. 10 11 This program is free software; you can redistribute it and/or modify 12 it under the terms of the GNU General Public License as published by 13 the Free Software Foundation; either version 3 of the License, or 14 (at your option) any later version. 15 16 This program is distributed in the hope that it will be useful, 17 but WITHOUT ANY WARRANTY; without even the implied warranty of 18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 GNU General Public License for more details. 20 21 You should have received a copy of the GNU General Public License 22 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 23 24 #include "defs.h" 25 #include "arch-utils.h" 26 #include "bfdlink.h" 27 #include "symtab.h" 28 #include "gdbtypes.h" 29 #include "gdbcore.h" 30 #include "frame.h" 31 #include "target.h" 32 #include "value.h" 33 #include "symfile.h" 34 #include "objfiles.h" 35 #include "source.h" 36 #include "gdbcmd.h" 37 #include "breakpoint.h" 38 #include "language.h" 39 #include "complaints.h" 40 #include "demangle.h" 41 #include "inferior.h" 42 #include "regcache.h" 43 #include "filenames.h" /* for DOSish file names */ 44 #include "gdb-stabs.h" 45 #include "gdb_obstack.h" 46 #include "completer.h" 47 #include "bcache.h" 48 #include "hashtab.h" 49 #include "readline/readline.h" 50 #include "gdb_assert.h" 51 #include "block.h" 52 #include "observer.h" 53 #include "exec.h" 54 #include "parser-defs.h" 55 #include "varobj.h" 56 #include "elf-bfd.h" 57 #include "solib.h" 58 #include "remote.h" 59 60 #include <sys/types.h> 61 #include <fcntl.h> 62 #include "gdb_string.h" 63 #include "gdb_stat.h" 64 #include <ctype.h> 65 #include <time.h> 66 #include <sys/time.h> 67 68 #include "psymtab.h" 69 70 int (*deprecated_ui_load_progress_hook) (const char *section, unsigned long num); 71 void (*deprecated_show_load_progress) (const char *section, 72 unsigned long section_sent, 73 unsigned long section_size, 74 unsigned long total_sent, 75 unsigned long total_size); 76 void (*deprecated_pre_add_symbol_hook) (const char *); 77 void (*deprecated_post_add_symbol_hook) (void); 78 79 static void clear_symtab_users_cleanup (void *ignore); 80 81 /* Global variables owned by this file */ 82 int readnow_symbol_files; /* Read full symbols immediately */ 83 84 /* External variables and functions referenced. */ 85 86 extern void report_transfer_performance (unsigned long, time_t, time_t); 87 88 /* Functions this file defines */ 89 90 #if 0 91 static int simple_read_overlay_region_table (void); 92 static void simple_free_overlay_region_table (void); 93 #endif 94 95 static void load_command (char *, int); 96 97 static void symbol_file_add_main_1 (char *args, int from_tty, int flags); 98 99 static void add_symbol_file_command (char *, int); 100 101 bfd *symfile_bfd_open (char *); 102 103 int get_section_index (struct objfile *, char *); 104 105 static struct sym_fns *find_sym_fns (bfd *); 106 107 static void decrement_reading_symtab (void *); 108 109 static void overlay_invalidate_all (void); 110 111 void list_overlays_command (char *, int); 112 113 void map_overlay_command (char *, int); 114 115 void unmap_overlay_command (char *, int); 116 117 static void overlay_auto_command (char *, int); 118 119 static void overlay_manual_command (char *, int); 120 121 static void overlay_off_command (char *, int); 122 123 static void overlay_load_command (char *, int); 124 125 static void overlay_command (char *, int); 126 127 static void simple_free_overlay_table (void); 128 129 static void read_target_long_array (CORE_ADDR, unsigned int *, int, int, 130 enum bfd_endian); 131 132 static int simple_read_overlay_table (void); 133 134 static int simple_overlay_update_1 (struct obj_section *); 135 136 static void add_filename_language (char *ext, enum language lang); 137 138 static void info_ext_lang_command (char *args, int from_tty); 139 140 static void init_filename_language_table (void); 141 142 static void symfile_find_segment_sections (struct objfile *objfile); 143 144 void _initialize_symfile (void); 145 146 /* List of all available sym_fns. On gdb startup, each object file reader 147 calls add_symtab_fns() to register information on each format it is 148 prepared to read. */ 149 150 static struct sym_fns *symtab_fns = NULL; 151 152 /* Flag for whether user will be reloading symbols multiple times. 153 Defaults to ON for VxWorks, otherwise OFF. */ 154 155 #ifdef SYMBOL_RELOADING_DEFAULT 156 int symbol_reloading = SYMBOL_RELOADING_DEFAULT; 157 #else 158 int symbol_reloading = 0; 159 #endif 160 static void 161 show_symbol_reloading (struct ui_file *file, int from_tty, 162 struct cmd_list_element *c, const char *value) 163 { 164 fprintf_filtered (file, _("\ 165 Dynamic symbol table reloading multiple times in one run is %s.\n"), 166 value); 167 } 168 169 /* If non-zero, shared library symbols will be added automatically 170 when the inferior is created, new libraries are loaded, or when 171 attaching to the inferior. This is almost always what users will 172 want to have happen; but for very large programs, the startup time 173 will be excessive, and so if this is a problem, the user can clear 174 this flag and then add the shared library symbols as needed. Note 175 that there is a potential for confusion, since if the shared 176 library symbols are not loaded, commands like "info fun" will *not* 177 report all the functions that are actually present. */ 178 179 int auto_solib_add = 1; 180 181 /* For systems that support it, a threshold size in megabytes. If 182 automatically adding a new library's symbol table to those already 183 known to the debugger would cause the total shared library symbol 184 size to exceed this threshhold, then the shlib's symbols are not 185 added. The threshold is ignored if the user explicitly asks for a 186 shlib to be added, such as when using the "sharedlibrary" 187 command. */ 188 189 int auto_solib_limit; 190 191 192 /* Make a null terminated copy of the string at PTR with SIZE characters in 193 the obstack pointed to by OBSTACKP . Returns the address of the copy. 194 Note that the string at PTR does not have to be null terminated, I.E. it 195 may be part of a larger string and we are only saving a substring. */ 196 197 char * 198 obsavestring (const char *ptr, int size, struct obstack *obstackp) 199 { 200 char *p = (char *) obstack_alloc (obstackp, size + 1); 201 /* Open-coded memcpy--saves function call time. These strings are usually 202 short. FIXME: Is this really still true with a compiler that can 203 inline memcpy? */ 204 { 205 const char *p1 = ptr; 206 char *p2 = p; 207 const char *end = ptr + size; 208 209 while (p1 != end) 210 *p2++ = *p1++; 211 } 212 p[size] = 0; 213 return p; 214 } 215 216 /* Concatenate NULL terminated variable argument list of `const char *' strings; 217 return the new string. Space is found in the OBSTACKP. Argument list must 218 be terminated by a sentinel expression `(char *) NULL'. */ 219 220 char * 221 obconcat (struct obstack *obstackp, ...) 222 { 223 va_list ap; 224 225 va_start (ap, obstackp); 226 for (;;) 227 { 228 const char *s = va_arg (ap, const char *); 229 230 if (s == NULL) 231 break; 232 233 obstack_grow_str (obstackp, s); 234 } 235 va_end (ap); 236 obstack_1grow (obstackp, 0); 237 238 return obstack_finish (obstackp); 239 } 240 241 /* True if we are reading a symbol table. */ 242 243 int currently_reading_symtab = 0; 244 245 static void 246 decrement_reading_symtab (void *dummy) 247 { 248 currently_reading_symtab--; 249 } 250 251 /* Increment currently_reading_symtab and return a cleanup that can be 252 used to decrement it. */ 253 struct cleanup * 254 increment_reading_symtab (void) 255 { 256 ++currently_reading_symtab; 257 return make_cleanup (decrement_reading_symtab, NULL); 258 } 259 260 /* Remember the lowest-addressed loadable section we've seen. 261 This function is called via bfd_map_over_sections. 262 263 In case of equal vmas, the section with the largest size becomes the 264 lowest-addressed loadable section. 265 266 If the vmas and sizes are equal, the last section is considered the 267 lowest-addressed loadable section. */ 268 269 void 270 find_lowest_section (bfd *abfd, asection *sect, void *obj) 271 { 272 asection **lowest = (asection **) obj; 273 274 if (0 == (bfd_get_section_flags (abfd, sect) & (SEC_ALLOC | SEC_LOAD))) 275 return; 276 if (!*lowest) 277 *lowest = sect; /* First loadable section */ 278 else if (bfd_section_vma (abfd, *lowest) > bfd_section_vma (abfd, sect)) 279 *lowest = sect; /* A lower loadable section */ 280 else if (bfd_section_vma (abfd, *lowest) == bfd_section_vma (abfd, sect) 281 && (bfd_section_size (abfd, (*lowest)) 282 <= bfd_section_size (abfd, sect))) 283 *lowest = sect; 284 } 285 286 /* Create a new section_addr_info, with room for NUM_SECTIONS. */ 287 288 struct section_addr_info * 289 alloc_section_addr_info (size_t num_sections) 290 { 291 struct section_addr_info *sap; 292 size_t size; 293 294 size = (sizeof (struct section_addr_info) 295 + sizeof (struct other_sections) * (num_sections - 1)); 296 sap = (struct section_addr_info *) xmalloc (size); 297 memset (sap, 0, size); 298 sap->num_sections = num_sections; 299 300 return sap; 301 } 302 303 /* Build (allocate and populate) a section_addr_info struct from 304 an existing section table. */ 305 306 extern struct section_addr_info * 307 build_section_addr_info_from_section_table (const struct target_section *start, 308 const struct target_section *end) 309 { 310 struct section_addr_info *sap; 311 const struct target_section *stp; 312 int oidx; 313 314 sap = alloc_section_addr_info (end - start); 315 316 for (stp = start, oidx = 0; stp != end; stp++) 317 { 318 if (bfd_get_section_flags (stp->bfd, 319 stp->the_bfd_section) & (SEC_ALLOC | SEC_LOAD) 320 && oidx < end - start) 321 { 322 sap->other[oidx].addr = stp->addr; 323 sap->other[oidx].name 324 = xstrdup (bfd_section_name (stp->bfd, stp->the_bfd_section)); 325 sap->other[oidx].sectindex = stp->the_bfd_section->index; 326 oidx++; 327 } 328 } 329 330 return sap; 331 } 332 333 /* Create a section_addr_info from section offsets in ABFD. */ 334 335 static struct section_addr_info * 336 build_section_addr_info_from_bfd (bfd *abfd) 337 { 338 struct section_addr_info *sap; 339 int i; 340 struct bfd_section *sec; 341 342 sap = alloc_section_addr_info (bfd_count_sections (abfd)); 343 for (i = 0, sec = abfd->sections; sec != NULL; sec = sec->next) 344 if (bfd_get_section_flags (abfd, sec) & (SEC_ALLOC | SEC_LOAD)) 345 { 346 sap->other[i].addr = bfd_get_section_vma (abfd, sec); 347 sap->other[i].name = xstrdup (bfd_get_section_name (abfd, sec)); 348 sap->other[i].sectindex = sec->index; 349 i++; 350 } 351 return sap; 352 } 353 354 /* Create a section_addr_info from section offsets in OBJFILE. */ 355 356 struct section_addr_info * 357 build_section_addr_info_from_objfile (const struct objfile *objfile) 358 { 359 struct section_addr_info *sap; 360 int i; 361 362 /* Before reread_symbols gets rewritten it is not safe to call: 363 gdb_assert (objfile->num_sections == bfd_count_sections (objfile->obfd)); 364 */ 365 sap = build_section_addr_info_from_bfd (objfile->obfd); 366 for (i = 0; i < sap->num_sections && sap->other[i].name; i++) 367 { 368 int sectindex = sap->other[i].sectindex; 369 370 sap->other[i].addr += objfile->section_offsets->offsets[sectindex]; 371 } 372 return sap; 373 } 374 375 /* Free all memory allocated by build_section_addr_info_from_section_table. */ 376 377 extern void 378 free_section_addr_info (struct section_addr_info *sap) 379 { 380 int idx; 381 382 for (idx = 0; idx < sap->num_sections; idx++) 383 if (sap->other[idx].name) 384 xfree (sap->other[idx].name); 385 xfree (sap); 386 } 387 388 389 /* Initialize OBJFILE's sect_index_* members. */ 390 static void 391 init_objfile_sect_indices (struct objfile *objfile) 392 { 393 asection *sect; 394 int i; 395 396 sect = bfd_get_section_by_name (objfile->obfd, ".text"); 397 if (sect) 398 objfile->sect_index_text = sect->index; 399 400 sect = bfd_get_section_by_name (objfile->obfd, ".data"); 401 if (sect) 402 objfile->sect_index_data = sect->index; 403 404 sect = bfd_get_section_by_name (objfile->obfd, ".bss"); 405 if (sect) 406 objfile->sect_index_bss = sect->index; 407 408 sect = bfd_get_section_by_name (objfile->obfd, ".rodata"); 409 if (sect) 410 objfile->sect_index_rodata = sect->index; 411 412 /* This is where things get really weird... We MUST have valid 413 indices for the various sect_index_* members or gdb will abort. 414 So if for example, there is no ".text" section, we have to 415 accomodate that. First, check for a file with the standard 416 one or two segments. */ 417 418 symfile_find_segment_sections (objfile); 419 420 /* Except when explicitly adding symbol files at some address, 421 section_offsets contains nothing but zeros, so it doesn't matter 422 which slot in section_offsets the individual sect_index_* members 423 index into. So if they are all zero, it is safe to just point 424 all the currently uninitialized indices to the first slot. But 425 beware: if this is the main executable, it may be relocated 426 later, e.g. by the remote qOffsets packet, and then this will 427 be wrong! That's why we try segments first. */ 428 429 for (i = 0; i < objfile->num_sections; i++) 430 { 431 if (ANOFFSET (objfile->section_offsets, i) != 0) 432 { 433 break; 434 } 435 } 436 if (i == objfile->num_sections) 437 { 438 if (objfile->sect_index_text == -1) 439 objfile->sect_index_text = 0; 440 if (objfile->sect_index_data == -1) 441 objfile->sect_index_data = 0; 442 if (objfile->sect_index_bss == -1) 443 objfile->sect_index_bss = 0; 444 if (objfile->sect_index_rodata == -1) 445 objfile->sect_index_rodata = 0; 446 } 447 } 448 449 /* The arguments to place_section. */ 450 451 struct place_section_arg 452 { 453 struct section_offsets *offsets; 454 CORE_ADDR lowest; 455 }; 456 457 /* Find a unique offset to use for loadable section SECT if 458 the user did not provide an offset. */ 459 460 static void 461 place_section (bfd *abfd, asection *sect, void *obj) 462 { 463 struct place_section_arg *arg = obj; 464 CORE_ADDR *offsets = arg->offsets->offsets, start_addr; 465 int done; 466 ULONGEST align = ((ULONGEST) 1) << bfd_get_section_alignment (abfd, sect); 467 468 /* We are only interested in allocated sections. */ 469 if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0) 470 return; 471 472 /* If the user specified an offset, honor it. */ 473 if (offsets[sect->index] != 0) 474 return; 475 476 /* Otherwise, let's try to find a place for the section. */ 477 start_addr = (arg->lowest + align - 1) & -align; 478 479 do { 480 asection *cur_sec; 481 482 done = 1; 483 484 for (cur_sec = abfd->sections; cur_sec != NULL; cur_sec = cur_sec->next) 485 { 486 int indx = cur_sec->index; 487 488 /* We don't need to compare against ourself. */ 489 if (cur_sec == sect) 490 continue; 491 492 /* We can only conflict with allocated sections. */ 493 if ((bfd_get_section_flags (abfd, cur_sec) & SEC_ALLOC) == 0) 494 continue; 495 496 /* If the section offset is 0, either the section has not been placed 497 yet, or it was the lowest section placed (in which case LOWEST 498 will be past its end). */ 499 if (offsets[indx] == 0) 500 continue; 501 502 /* If this section would overlap us, then we must move up. */ 503 if (start_addr + bfd_get_section_size (sect) > offsets[indx] 504 && start_addr < offsets[indx] + bfd_get_section_size (cur_sec)) 505 { 506 start_addr = offsets[indx] + bfd_get_section_size (cur_sec); 507 start_addr = (start_addr + align - 1) & -align; 508 done = 0; 509 break; 510 } 511 512 /* Otherwise, we appear to be OK. So far. */ 513 } 514 } 515 while (!done); 516 517 offsets[sect->index] = start_addr; 518 arg->lowest = start_addr + bfd_get_section_size (sect); 519 } 520 521 /* Store struct section_addr_info as prepared (made relative and with SECTINDEX 522 filled-in) by addr_info_make_relative into SECTION_OFFSETS of NUM_SECTIONS 523 entries. */ 524 525 void 526 relative_addr_info_to_section_offsets (struct section_offsets *section_offsets, 527 int num_sections, 528 struct section_addr_info *addrs) 529 { 530 int i; 531 532 memset (section_offsets, 0, SIZEOF_N_SECTION_OFFSETS (num_sections)); 533 534 /* Now calculate offsets for section that were specified by the caller. */ 535 for (i = 0; i < addrs->num_sections && addrs->other[i].name; i++) 536 { 537 struct other_sections *osp; 538 539 osp = &addrs->other[i]; 540 if (osp->addr == 0) 541 continue; 542 543 /* Record all sections in offsets */ 544 /* The section_offsets in the objfile are here filled in using 545 the BFD index. */ 546 section_offsets->offsets[osp->sectindex] = osp->addr; 547 } 548 } 549 550 /* qsort comparator for addrs_section_sort. Sort entries in ascending order by 551 their (name, sectindex) pair. sectindex makes the sort by name stable. */ 552 553 static int 554 addrs_section_compar (const void *ap, const void *bp) 555 { 556 const struct other_sections *a = *((struct other_sections **) ap); 557 const struct other_sections *b = *((struct other_sections **) bp); 558 int retval, a_idx, b_idx; 559 560 retval = strcmp (a->name, b->name); 561 if (retval) 562 return retval; 563 564 /* SECTINDEX is undefined iff ADDR is zero. */ 565 a_idx = a->addr == 0 ? 0 : a->sectindex; 566 b_idx = b->addr == 0 ? 0 : b->sectindex; 567 return a_idx - b_idx; 568 } 569 570 /* Provide sorted array of pointers to sections of ADDRS. The array is 571 terminated by NULL. Caller is responsible to call xfree for it. */ 572 573 static struct other_sections ** 574 addrs_section_sort (struct section_addr_info *addrs) 575 { 576 struct other_sections **array; 577 int i; 578 579 /* `+ 1' for the NULL terminator. */ 580 array = xmalloc (sizeof (*array) * (addrs->num_sections + 1)); 581 for (i = 0; i < addrs->num_sections && addrs->other[i].name; i++) 582 array[i] = &addrs->other[i]; 583 array[i] = NULL; 584 585 qsort (array, i, sizeof (*array), addrs_section_compar); 586 587 return array; 588 } 589 590 /* Relativize absolute addresses in ADDRS into offsets based on ABFD. Fill-in 591 also SECTINDEXes specific to ABFD there. This function can be used to 592 rebase ADDRS to start referencing different BFD than before. */ 593 594 void 595 addr_info_make_relative (struct section_addr_info *addrs, bfd *abfd) 596 { 597 asection *lower_sect; 598 CORE_ADDR lower_offset; 599 int i; 600 struct cleanup *my_cleanup; 601 struct section_addr_info *abfd_addrs; 602 struct other_sections **addrs_sorted, **abfd_addrs_sorted; 603 struct other_sections **addrs_to_abfd_addrs; 604 605 /* Find lowest loadable section to be used as starting point for 606 continguous sections. */ 607 lower_sect = NULL; 608 bfd_map_over_sections (abfd, find_lowest_section, &lower_sect); 609 if (lower_sect == NULL) 610 { 611 warning (_("no loadable sections found in added symbol-file %s"), 612 bfd_get_filename (abfd)); 613 lower_offset = 0; 614 } 615 else 616 lower_offset = bfd_section_vma (bfd_get_filename (abfd), lower_sect); 617 618 /* Create ADDRS_TO_ABFD_ADDRS array to map the sections in ADDRS to sections 619 in ABFD. Section names are not unique - there can be multiple sections of 620 the same name. Also the sections of the same name do not have to be 621 adjacent to each other. Some sections may be present only in one of the 622 files. Even sections present in both files do not have to be in the same 623 order. 624 625 Use stable sort by name for the sections in both files. Then linearly 626 scan both lists matching as most of the entries as possible. */ 627 628 addrs_sorted = addrs_section_sort (addrs); 629 my_cleanup = make_cleanup (xfree, addrs_sorted); 630 631 abfd_addrs = build_section_addr_info_from_bfd (abfd); 632 make_cleanup_free_section_addr_info (abfd_addrs); 633 abfd_addrs_sorted = addrs_section_sort (abfd_addrs); 634 make_cleanup (xfree, abfd_addrs_sorted); 635 636 /* Now create ADDRS_TO_ABFD_ADDRS from ADDRS_SORTED and ABFD_ADDRS_SORTED. */ 637 638 addrs_to_abfd_addrs = xzalloc (sizeof (*addrs_to_abfd_addrs) 639 * addrs->num_sections); 640 make_cleanup (xfree, addrs_to_abfd_addrs); 641 642 while (*addrs_sorted) 643 { 644 const char *sect_name = (*addrs_sorted)->name; 645 646 while (*abfd_addrs_sorted 647 && strcmp ((*abfd_addrs_sorted)->name, sect_name) < 0) 648 abfd_addrs_sorted++; 649 650 if (*abfd_addrs_sorted 651 && strcmp ((*abfd_addrs_sorted)->name, sect_name) == 0) 652 { 653 int index_in_addrs; 654 655 /* Make the found item directly addressable from ADDRS. */ 656 index_in_addrs = *addrs_sorted - addrs->other; 657 gdb_assert (addrs_to_abfd_addrs[index_in_addrs] == NULL); 658 addrs_to_abfd_addrs[index_in_addrs] = *abfd_addrs_sorted; 659 660 /* Never use the same ABFD entry twice. */ 661 abfd_addrs_sorted++; 662 } 663 664 addrs_sorted++; 665 } 666 667 /* Calculate offsets for the loadable sections. 668 FIXME! Sections must be in order of increasing loadable section 669 so that contiguous sections can use the lower-offset!!! 670 671 Adjust offsets if the segments are not contiguous. 672 If the section is contiguous, its offset should be set to 673 the offset of the highest loadable section lower than it 674 (the loadable section directly below it in memory). 675 this_offset = lower_offset = lower_addr - lower_orig_addr */ 676 677 for (i = 0; i < addrs->num_sections && addrs->other[i].name; i++) 678 { 679 const char *sect_name = addrs->other[i].name; 680 struct other_sections *sect = addrs_to_abfd_addrs[i]; 681 682 if (sect) 683 { 684 /* This is the index used by BFD. */ 685 addrs->other[i].sectindex = sect->sectindex; 686 687 if (addrs->other[i].addr != 0) 688 { 689 addrs->other[i].addr -= sect->addr; 690 lower_offset = addrs->other[i].addr; 691 } 692 else 693 addrs->other[i].addr = lower_offset; 694 } 695 else 696 { 697 /* This section does not exist in ABFD, which is normally 698 unexpected and we want to issue a warning. 699 700 However, the ELF prelinker does create a few sections which are 701 marked in the main executable as loadable (they are loaded in 702 memory from the DYNAMIC segment) and yet are not present in 703 separate debug info files. This is fine, and should not cause 704 a warning. Shared libraries contain just the section 705 ".gnu.liblist" but it is not marked as loadable there. There is 706 no other way to identify them than by their name as the sections 707 created by prelink have no special flags. */ 708 709 if (!(strcmp (sect_name, ".gnu.liblist") == 0 710 || strcmp (sect_name, ".gnu.conflict") == 0 711 || strcmp (sect_name, ".dynbss") == 0 712 || strcmp (sect_name, ".sdynbss") == 0)) 713 warning (_("section %s not found in %s"), sect_name, 714 bfd_get_filename (abfd)); 715 716 addrs->other[i].addr = 0; 717 718 /* SECTINDEX is invalid if ADDR is zero. */ 719 } 720 } 721 722 do_cleanups (my_cleanup); 723 } 724 725 /* Parse the user's idea of an offset for dynamic linking, into our idea 726 of how to represent it for fast symbol reading. This is the default 727 version of the sym_fns.sym_offsets function for symbol readers that 728 don't need to do anything special. It allocates a section_offsets table 729 for the objectfile OBJFILE and stuffs ADDR into all of the offsets. */ 730 731 void 732 default_symfile_offsets (struct objfile *objfile, 733 struct section_addr_info *addrs) 734 { 735 objfile->num_sections = bfd_count_sections (objfile->obfd); 736 objfile->section_offsets = (struct section_offsets *) 737 obstack_alloc (&objfile->objfile_obstack, 738 SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)); 739 relative_addr_info_to_section_offsets (objfile->section_offsets, 740 objfile->num_sections, addrs); 741 742 /* For relocatable files, all loadable sections will start at zero. 743 The zero is meaningless, so try to pick arbitrary addresses such 744 that no loadable sections overlap. This algorithm is quadratic, 745 but the number of sections in a single object file is generally 746 small. */ 747 if ((bfd_get_file_flags (objfile->obfd) & (EXEC_P | DYNAMIC)) == 0) 748 { 749 struct place_section_arg arg; 750 bfd *abfd = objfile->obfd; 751 asection *cur_sec; 752 753 for (cur_sec = abfd->sections; cur_sec != NULL; cur_sec = cur_sec->next) 754 /* We do not expect this to happen; just skip this step if the 755 relocatable file has a section with an assigned VMA. */ 756 if (bfd_section_vma (abfd, cur_sec) != 0) 757 break; 758 759 if (cur_sec == NULL) 760 { 761 CORE_ADDR *offsets = objfile->section_offsets->offsets; 762 763 /* Pick non-overlapping offsets for sections the user did not 764 place explicitly. */ 765 arg.offsets = objfile->section_offsets; 766 arg.lowest = 0; 767 bfd_map_over_sections (objfile->obfd, place_section, &arg); 768 769 /* Correctly filling in the section offsets is not quite 770 enough. Relocatable files have two properties that 771 (most) shared objects do not: 772 773 - Their debug information will contain relocations. Some 774 shared libraries do also, but many do not, so this can not 775 be assumed. 776 777 - If there are multiple code sections they will be loaded 778 at different relative addresses in memory than they are 779 in the objfile, since all sections in the file will start 780 at address zero. 781 782 Because GDB has very limited ability to map from an 783 address in debug info to the correct code section, 784 it relies on adding SECT_OFF_TEXT to things which might be 785 code. If we clear all the section offsets, and set the 786 section VMAs instead, then symfile_relocate_debug_section 787 will return meaningful debug information pointing at the 788 correct sections. 789 790 GDB has too many different data structures for section 791 addresses - a bfd, objfile, and so_list all have section 792 tables, as does exec_ops. Some of these could probably 793 be eliminated. */ 794 795 for (cur_sec = abfd->sections; cur_sec != NULL; 796 cur_sec = cur_sec->next) 797 { 798 if ((bfd_get_section_flags (abfd, cur_sec) & SEC_ALLOC) == 0) 799 continue; 800 801 bfd_set_section_vma (abfd, cur_sec, offsets[cur_sec->index]); 802 exec_set_section_address (bfd_get_filename (abfd), cur_sec->index, 803 offsets[cur_sec->index]); 804 offsets[cur_sec->index] = 0; 805 } 806 } 807 } 808 809 /* Remember the bfd indexes for the .text, .data, .bss and 810 .rodata sections. */ 811 init_objfile_sect_indices (objfile); 812 } 813 814 815 /* Divide the file into segments, which are individual relocatable units. 816 This is the default version of the sym_fns.sym_segments function for 817 symbol readers that do not have an explicit representation of segments. 818 It assumes that object files do not have segments, and fully linked 819 files have a single segment. */ 820 821 struct symfile_segment_data * 822 default_symfile_segments (bfd *abfd) 823 { 824 int num_sections, i; 825 asection *sect; 826 struct symfile_segment_data *data; 827 CORE_ADDR low, high; 828 829 /* Relocatable files contain enough information to position each 830 loadable section independently; they should not be relocated 831 in segments. */ 832 if ((bfd_get_file_flags (abfd) & (EXEC_P | DYNAMIC)) == 0) 833 return NULL; 834 835 /* Make sure there is at least one loadable section in the file. */ 836 for (sect = abfd->sections; sect != NULL; sect = sect->next) 837 { 838 if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0) 839 continue; 840 841 break; 842 } 843 if (sect == NULL) 844 return NULL; 845 846 low = bfd_get_section_vma (abfd, sect); 847 high = low + bfd_get_section_size (sect); 848 849 data = XZALLOC (struct symfile_segment_data); 850 data->num_segments = 1; 851 data->segment_bases = XCALLOC (1, CORE_ADDR); 852 data->segment_sizes = XCALLOC (1, CORE_ADDR); 853 854 num_sections = bfd_count_sections (abfd); 855 data->segment_info = XCALLOC (num_sections, int); 856 857 for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next) 858 { 859 CORE_ADDR vma; 860 861 if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0) 862 continue; 863 864 vma = bfd_get_section_vma (abfd, sect); 865 if (vma < low) 866 low = vma; 867 if (vma + bfd_get_section_size (sect) > high) 868 high = vma + bfd_get_section_size (sect); 869 870 data->segment_info[i] = 1; 871 } 872 873 data->segment_bases[0] = low; 874 data->segment_sizes[0] = high - low; 875 876 return data; 877 } 878 879 /* Process a symbol file, as either the main file or as a dynamically 880 loaded file. 881 882 OBJFILE is where the symbols are to be read from. 883 884 ADDRS is the list of section load addresses. If the user has given 885 an 'add-symbol-file' command, then this is the list of offsets and 886 addresses he or she provided as arguments to the command; or, if 887 we're handling a shared library, these are the actual addresses the 888 sections are loaded at, according to the inferior's dynamic linker 889 (as gleaned by GDB's shared library code). We convert each address 890 into an offset from the section VMA's as it appears in the object 891 file, and then call the file's sym_offsets function to convert this 892 into a format-specific offset table --- a `struct section_offsets'. 893 If ADDRS is non-zero, OFFSETS must be zero. 894 895 OFFSETS is a table of section offsets already in the right 896 format-specific representation. NUM_OFFSETS is the number of 897 elements present in OFFSETS->offsets. If OFFSETS is non-zero, we 898 assume this is the proper table the call to sym_offsets described 899 above would produce. Instead of calling sym_offsets, we just dump 900 it right into objfile->section_offsets. (When we're re-reading 901 symbols from an objfile, we don't have the original load address 902 list any more; all we have is the section offset table.) If 903 OFFSETS is non-zero, ADDRS must be zero. 904 905 ADD_FLAGS encodes verbosity level, whether this is main symbol or 906 an extra symbol file such as dynamically loaded code, and wether 907 breakpoint reset should be deferred. */ 908 909 void 910 syms_from_objfile (struct objfile *objfile, 911 struct section_addr_info *addrs, 912 struct section_offsets *offsets, 913 int num_offsets, 914 int add_flags) 915 { 916 struct section_addr_info *local_addr = NULL; 917 struct cleanup *old_chain; 918 const int mainline = add_flags & SYMFILE_MAINLINE; 919 920 gdb_assert (! (addrs && offsets)); 921 922 init_entry_point_info (objfile); 923 objfile->sf = find_sym_fns (objfile->obfd); 924 925 if (objfile->sf == NULL) 926 return; /* No symbols. */ 927 928 /* Make sure that partially constructed symbol tables will be cleaned up 929 if an error occurs during symbol reading. */ 930 old_chain = make_cleanup_free_objfile (objfile); 931 932 /* If ADDRS and OFFSETS are both NULL, put together a dummy address 933 list. We now establish the convention that an addr of zero means 934 no load address was specified. */ 935 if (! addrs && ! offsets) 936 { 937 local_addr 938 = alloc_section_addr_info (bfd_count_sections (objfile->obfd)); 939 make_cleanup (xfree, local_addr); 940 addrs = local_addr; 941 } 942 943 /* Now either addrs or offsets is non-zero. */ 944 945 if (mainline) 946 { 947 /* We will modify the main symbol table, make sure that all its users 948 will be cleaned up if an error occurs during symbol reading. */ 949 make_cleanup (clear_symtab_users_cleanup, 0 /*ignore*/); 950 951 /* Since no error yet, throw away the old symbol table. */ 952 953 if (symfile_objfile != NULL) 954 { 955 free_objfile (symfile_objfile); 956 gdb_assert (symfile_objfile == NULL); 957 } 958 959 /* Currently we keep symbols from the add-symbol-file command. 960 If the user wants to get rid of them, they should do "symbol-file" 961 without arguments first. Not sure this is the best behavior 962 (PR 2207). */ 963 964 (*objfile->sf->sym_new_init) (objfile); 965 } 966 967 /* Convert addr into an offset rather than an absolute address. 968 We find the lowest address of a loaded segment in the objfile, 969 and assume that <addr> is where that got loaded. 970 971 We no longer warn if the lowest section is not a text segment (as 972 happens for the PA64 port. */ 973 if (addrs && addrs->other[0].name) 974 addr_info_make_relative (addrs, objfile->obfd); 975 976 /* Initialize symbol reading routines for this objfile, allow complaints to 977 appear for this new file, and record how verbose to be, then do the 978 initial symbol reading for this file. */ 979 980 (*objfile->sf->sym_init) (objfile); 981 clear_complaints (&symfile_complaints, 1, add_flags & SYMFILE_VERBOSE); 982 983 if (addrs) 984 (*objfile->sf->sym_offsets) (objfile, addrs); 985 else 986 { 987 size_t size = SIZEOF_N_SECTION_OFFSETS (num_offsets); 988 989 /* Just copy in the offset table directly as given to us. */ 990 objfile->num_sections = num_offsets; 991 objfile->section_offsets 992 = ((struct section_offsets *) 993 obstack_alloc (&objfile->objfile_obstack, size)); 994 memcpy (objfile->section_offsets, offsets, size); 995 996 init_objfile_sect_indices (objfile); 997 } 998 999 (*objfile->sf->sym_read) (objfile, add_flags); 1000 1001 /* Discard cleanups as symbol reading was successful. */ 1002 1003 discard_cleanups (old_chain); 1004 xfree (local_addr); 1005 } 1006 1007 /* Perform required actions after either reading in the initial 1008 symbols for a new objfile, or mapping in the symbols from a reusable 1009 objfile. */ 1010 1011 void 1012 new_symfile_objfile (struct objfile *objfile, int add_flags) 1013 { 1014 /* If this is the main symbol file we have to clean up all users of the 1015 old main symbol file. Otherwise it is sufficient to fixup all the 1016 breakpoints that may have been redefined by this symbol file. */ 1017 if (add_flags & SYMFILE_MAINLINE) 1018 { 1019 /* OK, make it the "real" symbol file. */ 1020 symfile_objfile = objfile; 1021 1022 clear_symtab_users (); 1023 } 1024 else if ((add_flags & SYMFILE_DEFER_BP_RESET) == 0) 1025 { 1026 breakpoint_re_set (); 1027 } 1028 1029 /* We're done reading the symbol file; finish off complaints. */ 1030 clear_complaints (&symfile_complaints, 0, add_flags & SYMFILE_VERBOSE); 1031 } 1032 1033 /* Process a symbol file, as either the main file or as a dynamically 1034 loaded file. 1035 1036 ABFD is a BFD already open on the file, as from symfile_bfd_open. 1037 This BFD will be closed on error, and is always consumed by this function. 1038 1039 ADD_FLAGS encodes verbosity, whether this is main symbol file or 1040 extra, such as dynamically loaded code, and what to do with breakpoins. 1041 1042 ADDRS, OFFSETS, and NUM_OFFSETS are as described for 1043 syms_from_objfile, above. 1044 ADDRS is ignored when SYMFILE_MAINLINE bit is set in ADD_FLAGS. 1045 1046 Upon success, returns a pointer to the objfile that was added. 1047 Upon failure, jumps back to command level (never returns). */ 1048 1049 static struct objfile * 1050 symbol_file_add_with_addrs_or_offsets (bfd *abfd, 1051 int add_flags, 1052 struct section_addr_info *addrs, 1053 struct section_offsets *offsets, 1054 int num_offsets, 1055 int flags) 1056 { 1057 struct objfile *objfile; 1058 struct cleanup *my_cleanups; 1059 const char *name = bfd_get_filename (abfd); 1060 const int from_tty = add_flags & SYMFILE_VERBOSE; 1061 1062 my_cleanups = make_cleanup_bfd_close (abfd); 1063 1064 /* Give user a chance to burp if we'd be 1065 interactively wiping out any existing symbols. */ 1066 1067 if ((have_full_symbols () || have_partial_symbols ()) 1068 && (add_flags & SYMFILE_MAINLINE) 1069 && from_tty 1070 && !query (_("Load new symbol table from \"%s\"? "), name)) 1071 error (_("Not confirmed.")); 1072 1073 objfile = allocate_objfile (abfd, flags); 1074 discard_cleanups (my_cleanups); 1075 1076 /* We either created a new mapped symbol table, mapped an existing 1077 symbol table file which has not had initial symbol reading 1078 performed, or need to read an unmapped symbol table. */ 1079 if (from_tty || info_verbose) 1080 { 1081 if (deprecated_pre_add_symbol_hook) 1082 deprecated_pre_add_symbol_hook (name); 1083 else 1084 { 1085 printf_unfiltered (_("Reading symbols from %s..."), name); 1086 wrap_here (""); 1087 gdb_flush (gdb_stdout); 1088 } 1089 } 1090 syms_from_objfile (objfile, addrs, offsets, num_offsets, 1091 add_flags); 1092 1093 /* We now have at least a partial symbol table. Check to see if the 1094 user requested that all symbols be read on initial access via either 1095 the gdb startup command line or on a per symbol file basis. Expand 1096 all partial symbol tables for this objfile if so. */ 1097 1098 if ((flags & OBJF_READNOW) || readnow_symbol_files) 1099 { 1100 if (from_tty || info_verbose) 1101 { 1102 printf_unfiltered (_("expanding to full symbols...")); 1103 wrap_here (""); 1104 gdb_flush (gdb_stdout); 1105 } 1106 1107 if (objfile->sf) 1108 objfile->sf->qf->expand_all_symtabs (objfile); 1109 } 1110 1111 if ((from_tty || info_verbose) 1112 && !objfile_has_symbols (objfile)) 1113 { 1114 wrap_here (""); 1115 printf_unfiltered (_("(no debugging symbols found)...")); 1116 wrap_here (""); 1117 } 1118 1119 if (from_tty || info_verbose) 1120 { 1121 if (deprecated_post_add_symbol_hook) 1122 deprecated_post_add_symbol_hook (); 1123 else 1124 printf_unfiltered (_("done.\n")); 1125 } 1126 1127 /* We print some messages regardless of whether 'from_tty || 1128 info_verbose' is true, so make sure they go out at the right 1129 time. */ 1130 gdb_flush (gdb_stdout); 1131 1132 do_cleanups (my_cleanups); 1133 1134 if (objfile->sf == NULL) 1135 { 1136 observer_notify_new_objfile (objfile); 1137 return objfile; /* No symbols. */ 1138 } 1139 1140 new_symfile_objfile (objfile, add_flags); 1141 1142 observer_notify_new_objfile (objfile); 1143 1144 bfd_cache_close_all (); 1145 return (objfile); 1146 } 1147 1148 /* Add BFD as a separate debug file for OBJFILE. */ 1149 1150 void 1151 symbol_file_add_separate (bfd *bfd, int symfile_flags, struct objfile *objfile) 1152 { 1153 struct objfile *new_objfile; 1154 struct section_addr_info *sap; 1155 struct cleanup *my_cleanup; 1156 1157 /* Create section_addr_info. We can't directly use offsets from OBJFILE 1158 because sections of BFD may not match sections of OBJFILE and because 1159 vma may have been modified by tools such as prelink. */ 1160 sap = build_section_addr_info_from_objfile (objfile); 1161 my_cleanup = make_cleanup_free_section_addr_info (sap); 1162 1163 new_objfile = symbol_file_add_with_addrs_or_offsets 1164 (bfd, symfile_flags, 1165 sap, NULL, 0, 1166 objfile->flags & (OBJF_REORDERED | OBJF_SHARED | OBJF_READNOW 1167 | OBJF_USERLOADED)); 1168 1169 do_cleanups (my_cleanup); 1170 1171 add_separate_debug_objfile (new_objfile, objfile); 1172 } 1173 1174 /* Process the symbol file ABFD, as either the main file or as a 1175 dynamically loaded file. 1176 1177 See symbol_file_add_with_addrs_or_offsets's comments for 1178 details. */ 1179 struct objfile * 1180 symbol_file_add_from_bfd (bfd *abfd, int add_flags, 1181 struct section_addr_info *addrs, 1182 int flags) 1183 { 1184 return symbol_file_add_with_addrs_or_offsets (abfd, add_flags, addrs, 0, 0, 1185 flags); 1186 } 1187 1188 1189 /* Process a symbol file, as either the main file or as a dynamically 1190 loaded file. See symbol_file_add_with_addrs_or_offsets's comments 1191 for details. */ 1192 struct objfile * 1193 symbol_file_add (char *name, int add_flags, struct section_addr_info *addrs, 1194 int flags) 1195 { 1196 return symbol_file_add_from_bfd (symfile_bfd_open (name), add_flags, addrs, 1197 flags); 1198 } 1199 1200 1201 /* Call symbol_file_add() with default values and update whatever is 1202 affected by the loading of a new main(). 1203 Used when the file is supplied in the gdb command line 1204 and by some targets with special loading requirements. 1205 The auxiliary function, symbol_file_add_main_1(), has the flags 1206 argument for the switches that can only be specified in the symbol_file 1207 command itself. */ 1208 1209 void 1210 symbol_file_add_main (char *args, int from_tty) 1211 { 1212 symbol_file_add_main_1 (args, from_tty, 0); 1213 } 1214 1215 static void 1216 symbol_file_add_main_1 (char *args, int from_tty, int flags) 1217 { 1218 const int add_flags = SYMFILE_MAINLINE | (from_tty ? SYMFILE_VERBOSE : 0); 1219 symbol_file_add (args, add_flags, NULL, flags); 1220 1221 /* Getting new symbols may change our opinion about 1222 what is frameless. */ 1223 reinit_frame_cache (); 1224 1225 set_initial_language (); 1226 } 1227 1228 void 1229 symbol_file_clear (int from_tty) 1230 { 1231 if ((have_full_symbols () || have_partial_symbols ()) 1232 && from_tty 1233 && (symfile_objfile 1234 ? !query (_("Discard symbol table from `%s'? "), 1235 symfile_objfile->name) 1236 : !query (_("Discard symbol table? ")))) 1237 error (_("Not confirmed.")); 1238 1239 /* solib descriptors may have handles to objfiles. Wipe them before their 1240 objfiles get stale by free_all_objfiles. */ 1241 no_shared_libraries (NULL, from_tty); 1242 1243 free_all_objfiles (); 1244 1245 gdb_assert (symfile_objfile == NULL); 1246 if (from_tty) 1247 printf_unfiltered (_("No symbol file now.\n")); 1248 } 1249 1250 static char * 1251 get_debug_link_info (struct objfile *objfile, unsigned long *crc32_out) 1252 { 1253 asection *sect; 1254 bfd_size_type debuglink_size; 1255 unsigned long crc32; 1256 char *contents; 1257 int crc_offset; 1258 1259 sect = bfd_get_section_by_name (objfile->obfd, ".gnu_debuglink"); 1260 1261 if (sect == NULL) 1262 return NULL; 1263 1264 debuglink_size = bfd_section_size (objfile->obfd, sect); 1265 1266 contents = xmalloc (debuglink_size); 1267 bfd_get_section_contents (objfile->obfd, sect, contents, 1268 (file_ptr)0, (bfd_size_type)debuglink_size); 1269 1270 /* Crc value is stored after the filename, aligned up to 4 bytes. */ 1271 crc_offset = strlen (contents) + 1; 1272 crc_offset = (crc_offset + 3) & ~3; 1273 1274 crc32 = bfd_get_32 (objfile->obfd, (bfd_byte *) (contents + crc_offset)); 1275 1276 *crc32_out = crc32; 1277 return contents; 1278 } 1279 1280 static int 1281 separate_debug_file_exists (const char *name, unsigned long crc, 1282 struct objfile *parent_objfile) 1283 { 1284 unsigned long file_crc = 0; 1285 bfd *abfd; 1286 gdb_byte buffer[8*1024]; 1287 int count; 1288 struct stat parent_stat, abfd_stat; 1289 1290 /* Find a separate debug info file as if symbols would be present in 1291 PARENT_OBJFILE itself this function would not be called. .gnu_debuglink 1292 section can contain just the basename of PARENT_OBJFILE without any 1293 ".debug" suffix as "/usr/lib/debug/path/to/file" is a separate tree where 1294 the separate debug infos with the same basename can exist. */ 1295 1296 if (strcmp (name, parent_objfile->name) == 0) 1297 return 0; 1298 1299 abfd = bfd_open_maybe_remote (name); 1300 1301 if (!abfd) 1302 return 0; 1303 1304 /* Verify symlinks were not the cause of strcmp name difference above. 1305 1306 Some operating systems, e.g. Windows, do not provide a meaningful 1307 st_ino; they always set it to zero. (Windows does provide a 1308 meaningful st_dev.) Do not indicate a duplicate library in that 1309 case. While there is no guarantee that a system that provides 1310 meaningful inode numbers will never set st_ino to zero, this is 1311 merely an optimization, so we do not need to worry about false 1312 negatives. */ 1313 1314 if (bfd_stat (abfd, &abfd_stat) == 0 1315 && bfd_stat (parent_objfile->obfd, &parent_stat) == 0 1316 && abfd_stat.st_dev == parent_stat.st_dev 1317 && abfd_stat.st_ino == parent_stat.st_ino 1318 && abfd_stat.st_ino != 0) 1319 { 1320 bfd_close (abfd); 1321 return 0; 1322 } 1323 1324 while ((count = bfd_bread (buffer, sizeof (buffer), abfd)) > 0) 1325 file_crc = gnu_debuglink_crc32 (file_crc, buffer, count); 1326 1327 bfd_close (abfd); 1328 1329 if (crc != file_crc) 1330 { 1331 warning (_("the debug information found in \"%s\"" 1332 " does not match \"%s\" (CRC mismatch).\n"), 1333 name, parent_objfile->name); 1334 return 0; 1335 } 1336 1337 return 1; 1338 } 1339 1340 char *debug_file_directory = NULL; 1341 static void 1342 show_debug_file_directory (struct ui_file *file, int from_tty, 1343 struct cmd_list_element *c, const char *value) 1344 { 1345 fprintf_filtered (file, _("\ 1346 The directory where separate debug symbols are searched for is \"%s\".\n"), 1347 value); 1348 } 1349 1350 #if ! defined (DEBUG_SUBDIRECTORY) 1351 #define DEBUG_SUBDIRECTORY ".debug" 1352 #endif 1353 1354 char * 1355 find_separate_debug_file_by_debuglink (struct objfile *objfile) 1356 { 1357 char *basename, *debugdir; 1358 char *dir = NULL; 1359 char *debugfile = NULL; 1360 char *canon_name = NULL; 1361 unsigned long crc32; 1362 int i; 1363 1364 basename = get_debug_link_info (objfile, &crc32); 1365 1366 if (basename == NULL) 1367 /* There's no separate debug info, hence there's no way we could 1368 load it => no warning. */ 1369 goto cleanup_return_debugfile; 1370 1371 dir = xstrdup (objfile->name); 1372 1373 /* Strip off the final filename part, leaving the directory name, 1374 followed by a slash. The directory can be relative or absolute. */ 1375 for (i = strlen(dir) - 1; i >= 0; i--) 1376 { 1377 if (IS_DIR_SEPARATOR (dir[i])) 1378 break; 1379 } 1380 /* If I is -1 then no directory is present there and DIR will be "". */ 1381 dir[i+1] = '\0'; 1382 1383 /* Set I to max (strlen (canon_name), strlen (dir)). */ 1384 canon_name = lrealpath (dir); 1385 i = strlen (dir); 1386 if (canon_name && strlen (canon_name) > i) 1387 i = strlen (canon_name); 1388 1389 debugfile = xmalloc (strlen (debug_file_directory) + 1 1390 + i 1391 + strlen (DEBUG_SUBDIRECTORY) 1392 + strlen ("/") 1393 + strlen (basename) 1394 + 1); 1395 1396 /* First try in the same directory as the original file. */ 1397 strcpy (debugfile, dir); 1398 strcat (debugfile, basename); 1399 1400 if (separate_debug_file_exists (debugfile, crc32, objfile)) 1401 goto cleanup_return_debugfile; 1402 1403 /* Then try in the subdirectory named DEBUG_SUBDIRECTORY. */ 1404 strcpy (debugfile, dir); 1405 strcat (debugfile, DEBUG_SUBDIRECTORY); 1406 strcat (debugfile, "/"); 1407 strcat (debugfile, basename); 1408 1409 if (separate_debug_file_exists (debugfile, crc32, objfile)) 1410 goto cleanup_return_debugfile; 1411 1412 /* Then try in the global debugfile directories. 1413 1414 Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will 1415 cause "/..." lookups. */ 1416 1417 debugdir = debug_file_directory; 1418 do 1419 { 1420 char *debugdir_end; 1421 1422 while (*debugdir == DIRNAME_SEPARATOR) 1423 debugdir++; 1424 1425 debugdir_end = strchr (debugdir, DIRNAME_SEPARATOR); 1426 if (debugdir_end == NULL) 1427 debugdir_end = &debugdir[strlen (debugdir)]; 1428 1429 memcpy (debugfile, debugdir, debugdir_end - debugdir); 1430 debugfile[debugdir_end - debugdir] = 0; 1431 strcat (debugfile, "/"); 1432 strcat (debugfile, dir); 1433 strcat (debugfile, basename); 1434 1435 if (separate_debug_file_exists (debugfile, crc32, objfile)) 1436 goto cleanup_return_debugfile; 1437 1438 /* If the file is in the sysroot, try using its base path in the 1439 global debugfile directory. */ 1440 if (canon_name 1441 && strncmp (canon_name, gdb_sysroot, strlen (gdb_sysroot)) == 0 1442 && IS_DIR_SEPARATOR (canon_name[strlen (gdb_sysroot)])) 1443 { 1444 memcpy (debugfile, debugdir, debugdir_end - debugdir); 1445 debugfile[debugdir_end - debugdir] = 0; 1446 strcat (debugfile, canon_name + strlen (gdb_sysroot)); 1447 strcat (debugfile, "/"); 1448 strcat (debugfile, basename); 1449 1450 if (separate_debug_file_exists (debugfile, crc32, objfile)) 1451 goto cleanup_return_debugfile; 1452 } 1453 1454 debugdir = debugdir_end; 1455 } 1456 while (*debugdir != 0); 1457 1458 xfree (debugfile); 1459 debugfile = NULL; 1460 1461 cleanup_return_debugfile: 1462 xfree (canon_name); 1463 xfree (basename); 1464 xfree (dir); 1465 return debugfile; 1466 } 1467 1468 1469 /* This is the symbol-file command. Read the file, analyze its 1470 symbols, and add a struct symtab to a symtab list. The syntax of 1471 the command is rather bizarre: 1472 1473 1. The function buildargv implements various quoting conventions 1474 which are undocumented and have little or nothing in common with 1475 the way things are quoted (or not quoted) elsewhere in GDB. 1476 1477 2. Options are used, which are not generally used in GDB (perhaps 1478 "set mapped on", "set readnow on" would be better) 1479 1480 3. The order of options matters, which is contrary to GNU 1481 conventions (because it is confusing and inconvenient). */ 1482 1483 void 1484 symbol_file_command (char *args, int from_tty) 1485 { 1486 dont_repeat (); 1487 1488 if (args == NULL) 1489 { 1490 symbol_file_clear (from_tty); 1491 } 1492 else 1493 { 1494 char **argv = gdb_buildargv (args); 1495 int flags = OBJF_USERLOADED; 1496 struct cleanup *cleanups; 1497 char *name = NULL; 1498 1499 cleanups = make_cleanup_freeargv (argv); 1500 while (*argv != NULL) 1501 { 1502 if (strcmp (*argv, "-readnow") == 0) 1503 flags |= OBJF_READNOW; 1504 else if (**argv == '-') 1505 error (_("unknown option `%s'"), *argv); 1506 else 1507 { 1508 symbol_file_add_main_1 (*argv, from_tty, flags); 1509 name = *argv; 1510 } 1511 1512 argv++; 1513 } 1514 1515 if (name == NULL) 1516 error (_("no symbol file name was specified")); 1517 1518 do_cleanups (cleanups); 1519 } 1520 } 1521 1522 /* Set the initial language. 1523 1524 FIXME: A better solution would be to record the language in the 1525 psymtab when reading partial symbols, and then use it (if known) to 1526 set the language. This would be a win for formats that encode the 1527 language in an easily discoverable place, such as DWARF. For 1528 stabs, we can jump through hoops looking for specially named 1529 symbols or try to intuit the language from the specific type of 1530 stabs we find, but we can't do that until later when we read in 1531 full symbols. */ 1532 1533 void 1534 set_initial_language (void) 1535 { 1536 char *filename; 1537 enum language lang = language_unknown; 1538 1539 filename = find_main_filename (); 1540 if (filename != NULL) 1541 lang = deduce_language_from_filename (filename); 1542 1543 if (lang == language_unknown) 1544 { 1545 /* Make C the default language */ 1546 lang = language_c; 1547 } 1548 1549 set_language (lang); 1550 expected_language = current_language; /* Don't warn the user. */ 1551 } 1552 1553 /* If NAME is a remote name open the file using remote protocol, otherwise 1554 open it normally. */ 1555 1556 bfd * 1557 bfd_open_maybe_remote (const char *name) 1558 { 1559 if (remote_filename_p (name)) 1560 return remote_bfd_open (name, gnutarget); 1561 else 1562 return bfd_openr (name, gnutarget); 1563 } 1564 1565 1566 /* Open the file specified by NAME and hand it off to BFD for 1567 preliminary analysis. Return a newly initialized bfd *, which 1568 includes a newly malloc'd` copy of NAME (tilde-expanded and made 1569 absolute). In case of trouble, error() is called. */ 1570 1571 bfd * 1572 symfile_bfd_open (char *name) 1573 { 1574 bfd *sym_bfd; 1575 int desc; 1576 char *absolute_name; 1577 1578 if (remote_filename_p (name)) 1579 { 1580 name = xstrdup (name); 1581 sym_bfd = remote_bfd_open (name, gnutarget); 1582 if (!sym_bfd) 1583 { 1584 make_cleanup (xfree, name); 1585 error (_("`%s': can't open to read symbols: %s."), name, 1586 bfd_errmsg (bfd_get_error ())); 1587 } 1588 1589 if (!bfd_check_format (sym_bfd, bfd_object)) 1590 { 1591 bfd_close (sym_bfd); 1592 make_cleanup (xfree, name); 1593 error (_("`%s': can't read symbols: %s."), name, 1594 bfd_errmsg (bfd_get_error ())); 1595 } 1596 1597 return sym_bfd; 1598 } 1599 1600 name = tilde_expand (name); /* Returns 1st new malloc'd copy. */ 1601 1602 /* Look down path for it, allocate 2nd new malloc'd copy. */ 1603 desc = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST, name, 1604 O_RDONLY | O_BINARY, &absolute_name); 1605 #if defined(__GO32__) || defined(_WIN32) || defined (__CYGWIN__) 1606 if (desc < 0) 1607 { 1608 char *exename = alloca (strlen (name) + 5); 1609 1610 strcat (strcpy (exename, name), ".exe"); 1611 desc = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST, exename, 1612 O_RDONLY | O_BINARY, &absolute_name); 1613 } 1614 #endif 1615 if (desc < 0) 1616 { 1617 make_cleanup (xfree, name); 1618 perror_with_name (name); 1619 } 1620 1621 /* Free 1st new malloc'd copy, but keep the 2nd malloc'd copy in 1622 bfd. It'll be freed in free_objfile(). */ 1623 xfree (name); 1624 name = absolute_name; 1625 1626 sym_bfd = bfd_fopen (name, gnutarget, FOPEN_RB, desc); 1627 if (!sym_bfd) 1628 { 1629 close (desc); 1630 make_cleanup (xfree, name); 1631 error (_("`%s': can't open to read symbols: %s."), name, 1632 bfd_errmsg (bfd_get_error ())); 1633 } 1634 bfd_set_cacheable (sym_bfd, 1); 1635 1636 if (!bfd_check_format (sym_bfd, bfd_object)) 1637 { 1638 /* FIXME: should be checking for errors from bfd_close (for one 1639 thing, on error it does not free all the storage associated 1640 with the bfd). */ 1641 bfd_close (sym_bfd); /* This also closes desc. */ 1642 make_cleanup (xfree, name); 1643 error (_("`%s': can't read symbols: %s."), name, 1644 bfd_errmsg (bfd_get_error ())); 1645 } 1646 1647 /* bfd_usrdata exists for applications and libbfd must not touch it. */ 1648 gdb_assert (bfd_usrdata (sym_bfd) == NULL); 1649 1650 return sym_bfd; 1651 } 1652 1653 /* Return the section index for SECTION_NAME on OBJFILE. Return -1 if 1654 the section was not found. */ 1655 1656 int 1657 get_section_index (struct objfile *objfile, char *section_name) 1658 { 1659 asection *sect = bfd_get_section_by_name (objfile->obfd, section_name); 1660 1661 if (sect) 1662 return sect->index; 1663 else 1664 return -1; 1665 } 1666 1667 /* Link SF into the global symtab_fns list. Called on startup by the 1668 _initialize routine in each object file format reader, to register 1669 information about each format the the reader is prepared to 1670 handle. */ 1671 1672 void 1673 add_symtab_fns (struct sym_fns *sf) 1674 { 1675 sf->next = symtab_fns; 1676 symtab_fns = sf; 1677 } 1678 1679 /* Initialize OBJFILE to read symbols from its associated BFD. It 1680 either returns or calls error(). The result is an initialized 1681 struct sym_fns in the objfile structure, that contains cached 1682 information about the symbol file. */ 1683 1684 static struct sym_fns * 1685 find_sym_fns (bfd *abfd) 1686 { 1687 struct sym_fns *sf; 1688 enum bfd_flavour our_flavour = bfd_get_flavour (abfd); 1689 1690 if (our_flavour == bfd_target_srec_flavour 1691 || our_flavour == bfd_target_ihex_flavour 1692 || our_flavour == bfd_target_tekhex_flavour) 1693 return NULL; /* No symbols. */ 1694 1695 for (sf = symtab_fns; sf != NULL; sf = sf->next) 1696 if (our_flavour == sf->sym_flavour) 1697 return sf; 1698 1699 error (_("I'm sorry, Dave, I can't do that. Symbol format `%s' unknown."), 1700 bfd_get_target (abfd)); 1701 } 1702 1703 1704 /* This function runs the load command of our current target. */ 1705 1706 static void 1707 load_command (char *arg, int from_tty) 1708 { 1709 /* The user might be reloading because the binary has changed. Take 1710 this opportunity to check. */ 1711 reopen_exec_file (); 1712 reread_symbols (); 1713 1714 if (arg == NULL) 1715 { 1716 char *parg; 1717 int count = 0; 1718 1719 parg = arg = get_exec_file (1); 1720 1721 /* Count how many \ " ' tab space there are in the name. */ 1722 while ((parg = strpbrk (parg, "\\\"'\t "))) 1723 { 1724 parg++; 1725 count++; 1726 } 1727 1728 if (count) 1729 { 1730 /* We need to quote this string so buildargv can pull it apart. */ 1731 char *temp = xmalloc (strlen (arg) + count + 1 ); 1732 char *ptemp = temp; 1733 char *prev; 1734 1735 make_cleanup (xfree, temp); 1736 1737 prev = parg = arg; 1738 while ((parg = strpbrk (parg, "\\\"'\t "))) 1739 { 1740 strncpy (ptemp, prev, parg - prev); 1741 ptemp += parg - prev; 1742 prev = parg++; 1743 *ptemp++ = '\\'; 1744 } 1745 strcpy (ptemp, prev); 1746 1747 arg = temp; 1748 } 1749 } 1750 1751 target_load (arg, from_tty); 1752 1753 /* After re-loading the executable, we don't really know which 1754 overlays are mapped any more. */ 1755 overlay_cache_invalid = 1; 1756 } 1757 1758 /* This version of "load" should be usable for any target. Currently 1759 it is just used for remote targets, not inftarg.c or core files, 1760 on the theory that only in that case is it useful. 1761 1762 Avoiding xmodem and the like seems like a win (a) because we don't have 1763 to worry about finding it, and (b) On VMS, fork() is very slow and so 1764 we don't want to run a subprocess. On the other hand, I'm not sure how 1765 performance compares. */ 1766 1767 static int validate_download = 0; 1768 1769 /* Callback service function for generic_load (bfd_map_over_sections). */ 1770 1771 static void 1772 add_section_size_callback (bfd *abfd, asection *asec, void *data) 1773 { 1774 bfd_size_type *sum = data; 1775 1776 *sum += bfd_get_section_size (asec); 1777 } 1778 1779 /* Opaque data for load_section_callback. */ 1780 struct load_section_data { 1781 unsigned long load_offset; 1782 struct load_progress_data *progress_data; 1783 VEC(memory_write_request_s) *requests; 1784 }; 1785 1786 /* Opaque data for load_progress. */ 1787 struct load_progress_data { 1788 /* Cumulative data. */ 1789 unsigned long write_count; 1790 unsigned long data_count; 1791 bfd_size_type total_size; 1792 }; 1793 1794 /* Opaque data for load_progress for a single section. */ 1795 struct load_progress_section_data { 1796 struct load_progress_data *cumulative; 1797 1798 /* Per-section data. */ 1799 const char *section_name; 1800 ULONGEST section_sent; 1801 ULONGEST section_size; 1802 CORE_ADDR lma; 1803 gdb_byte *buffer; 1804 }; 1805 1806 /* Target write callback routine for progress reporting. */ 1807 1808 static void 1809 load_progress (ULONGEST bytes, void *untyped_arg) 1810 { 1811 struct load_progress_section_data *args = untyped_arg; 1812 struct load_progress_data *totals; 1813 1814 if (args == NULL) 1815 /* Writing padding data. No easy way to get at the cumulative 1816 stats, so just ignore this. */ 1817 return; 1818 1819 totals = args->cumulative; 1820 1821 if (bytes == 0 && args->section_sent == 0) 1822 { 1823 /* The write is just starting. Let the user know we've started 1824 this section. */ 1825 ui_out_message (uiout, 0, "Loading section %s, size %s lma %s\n", 1826 args->section_name, hex_string (args->section_size), 1827 paddress (target_gdbarch, args->lma)); 1828 return; 1829 } 1830 1831 if (validate_download) 1832 { 1833 /* Broken memories and broken monitors manifest themselves here 1834 when bring new computers to life. This doubles already slow 1835 downloads. */ 1836 /* NOTE: cagney/1999-10-18: A more efficient implementation 1837 might add a verify_memory() method to the target vector and 1838 then use that. remote.c could implement that method using 1839 the ``qCRC'' packet. */ 1840 gdb_byte *check = xmalloc (bytes); 1841 struct cleanup *verify_cleanups = make_cleanup (xfree, check); 1842 1843 if (target_read_memory (args->lma, check, bytes) != 0) 1844 error (_("Download verify read failed at %s"), 1845 paddress (target_gdbarch, args->lma)); 1846 if (memcmp (args->buffer, check, bytes) != 0) 1847 error (_("Download verify compare failed at %s"), 1848 paddress (target_gdbarch, args->lma)); 1849 do_cleanups (verify_cleanups); 1850 } 1851 totals->data_count += bytes; 1852 args->lma += bytes; 1853 args->buffer += bytes; 1854 totals->write_count += 1; 1855 args->section_sent += bytes; 1856 if (quit_flag 1857 || (deprecated_ui_load_progress_hook != NULL 1858 && deprecated_ui_load_progress_hook (args->section_name, 1859 args->section_sent))) 1860 error (_("Canceled the download")); 1861 1862 if (deprecated_show_load_progress != NULL) 1863 deprecated_show_load_progress (args->section_name, 1864 args->section_sent, 1865 args->section_size, 1866 totals->data_count, 1867 totals->total_size); 1868 } 1869 1870 /* Callback service function for generic_load (bfd_map_over_sections). */ 1871 1872 static void 1873 load_section_callback (bfd *abfd, asection *asec, void *data) 1874 { 1875 struct memory_write_request *new_request; 1876 struct load_section_data *args = data; 1877 struct load_progress_section_data *section_data; 1878 bfd_size_type size = bfd_get_section_size (asec); 1879 gdb_byte *buffer; 1880 const char *sect_name = bfd_get_section_name (abfd, asec); 1881 1882 if ((bfd_get_section_flags (abfd, asec) & SEC_LOAD) == 0) 1883 return; 1884 1885 if (size == 0) 1886 return; 1887 1888 new_request = VEC_safe_push (memory_write_request_s, 1889 args->requests, NULL); 1890 memset (new_request, 0, sizeof (struct memory_write_request)); 1891 section_data = xcalloc (1, sizeof (struct load_progress_section_data)); 1892 new_request->begin = bfd_section_lma (abfd, asec) + args->load_offset; 1893 new_request->end = new_request->begin + size; /* FIXME Should size be in instead? */ 1894 new_request->data = xmalloc (size); 1895 new_request->baton = section_data; 1896 1897 buffer = new_request->data; 1898 1899 section_data->cumulative = args->progress_data; 1900 section_data->section_name = sect_name; 1901 section_data->section_size = size; 1902 section_data->lma = new_request->begin; 1903 section_data->buffer = buffer; 1904 1905 bfd_get_section_contents (abfd, asec, buffer, 0, size); 1906 } 1907 1908 /* Clean up an entire memory request vector, including load 1909 data and progress records. */ 1910 1911 static void 1912 clear_memory_write_data (void *arg) 1913 { 1914 VEC(memory_write_request_s) **vec_p = arg; 1915 VEC(memory_write_request_s) *vec = *vec_p; 1916 int i; 1917 struct memory_write_request *mr; 1918 1919 for (i = 0; VEC_iterate (memory_write_request_s, vec, i, mr); ++i) 1920 { 1921 xfree (mr->data); 1922 xfree (mr->baton); 1923 } 1924 VEC_free (memory_write_request_s, vec); 1925 } 1926 1927 void 1928 generic_load (char *args, int from_tty) 1929 { 1930 bfd *loadfile_bfd; 1931 struct timeval start_time, end_time; 1932 char *filename; 1933 struct cleanup *old_cleanups = make_cleanup (null_cleanup, 0); 1934 struct load_section_data cbdata; 1935 struct load_progress_data total_progress; 1936 1937 CORE_ADDR entry; 1938 char **argv; 1939 1940 memset (&cbdata, 0, sizeof (cbdata)); 1941 memset (&total_progress, 0, sizeof (total_progress)); 1942 cbdata.progress_data = &total_progress; 1943 1944 make_cleanup (clear_memory_write_data, &cbdata.requests); 1945 1946 if (args == NULL) 1947 error_no_arg (_("file to load")); 1948 1949 argv = gdb_buildargv (args); 1950 make_cleanup_freeargv (argv); 1951 1952 filename = tilde_expand (argv[0]); 1953 make_cleanup (xfree, filename); 1954 1955 if (argv[1] != NULL) 1956 { 1957 char *endptr; 1958 1959 cbdata.load_offset = strtoul (argv[1], &endptr, 0); 1960 1961 /* If the last word was not a valid number then 1962 treat it as a file name with spaces in. */ 1963 if (argv[1] == endptr) 1964 error (_("Invalid download offset:%s."), argv[1]); 1965 1966 if (argv[2] != NULL) 1967 error (_("Too many parameters.")); 1968 } 1969 1970 /* Open the file for loading. */ 1971 loadfile_bfd = bfd_openr (filename, gnutarget); 1972 if (loadfile_bfd == NULL) 1973 { 1974 perror_with_name (filename); 1975 return; 1976 } 1977 1978 /* FIXME: should be checking for errors from bfd_close (for one thing, 1979 on error it does not free all the storage associated with the 1980 bfd). */ 1981 make_cleanup_bfd_close (loadfile_bfd); 1982 1983 if (!bfd_check_format (loadfile_bfd, bfd_object)) 1984 { 1985 error (_("\"%s\" is not an object file: %s"), filename, 1986 bfd_errmsg (bfd_get_error ())); 1987 } 1988 1989 bfd_map_over_sections (loadfile_bfd, add_section_size_callback, 1990 (void *) &total_progress.total_size); 1991 1992 bfd_map_over_sections (loadfile_bfd, load_section_callback, &cbdata); 1993 1994 gettimeofday (&start_time, NULL); 1995 1996 if (target_write_memory_blocks (cbdata.requests, flash_discard, 1997 load_progress) != 0) 1998 error (_("Load failed")); 1999 2000 gettimeofday (&end_time, NULL); 2001 2002 entry = bfd_get_start_address (loadfile_bfd); 2003 ui_out_text (uiout, "Start address "); 2004 ui_out_field_fmt (uiout, "address", "%s", paddress (target_gdbarch, entry)); 2005 ui_out_text (uiout, ", load size "); 2006 ui_out_field_fmt (uiout, "load-size", "%lu", total_progress.data_count); 2007 ui_out_text (uiout, "\n"); 2008 /* We were doing this in remote-mips.c, I suspect it is right 2009 for other targets too. */ 2010 regcache_write_pc (get_current_regcache (), entry); 2011 2012 /* Reset breakpoints, now that we have changed the load image. For 2013 instance, breakpoints may have been set (or reset, by 2014 post_create_inferior) while connected to the target but before we 2015 loaded the program. In that case, the prologue analyzer could 2016 have read instructions from the target to find the right 2017 breakpoint locations. Loading has changed the contents of that 2018 memory. */ 2019 2020 breakpoint_re_set (); 2021 2022 /* FIXME: are we supposed to call symbol_file_add or not? According 2023 to a comment from remote-mips.c (where a call to symbol_file_add 2024 was commented out), making the call confuses GDB if more than one 2025 file is loaded in. Some targets do (e.g., remote-vx.c) but 2026 others don't (or didn't - perhaps they have all been deleted). */ 2027 2028 print_transfer_performance (gdb_stdout, total_progress.data_count, 2029 total_progress.write_count, 2030 &start_time, &end_time); 2031 2032 do_cleanups (old_cleanups); 2033 } 2034 2035 /* Report how fast the transfer went. */ 2036 2037 /* DEPRECATED: cagney/1999-10-18: report_transfer_performance is being 2038 replaced by print_transfer_performance (with a very different 2039 function signature). */ 2040 2041 void 2042 report_transfer_performance (unsigned long data_count, time_t start_time, 2043 time_t end_time) 2044 { 2045 struct timeval start, end; 2046 2047 start.tv_sec = start_time; 2048 start.tv_usec = 0; 2049 end.tv_sec = end_time; 2050 end.tv_usec = 0; 2051 2052 print_transfer_performance (gdb_stdout, data_count, 0, &start, &end); 2053 } 2054 2055 void 2056 print_transfer_performance (struct ui_file *stream, 2057 unsigned long data_count, 2058 unsigned long write_count, 2059 const struct timeval *start_time, 2060 const struct timeval *end_time) 2061 { 2062 ULONGEST time_count; 2063 2064 /* Compute the elapsed time in milliseconds, as a tradeoff between 2065 accuracy and overflow. */ 2066 time_count = (end_time->tv_sec - start_time->tv_sec) * 1000; 2067 time_count += (end_time->tv_usec - start_time->tv_usec) / 1000; 2068 2069 ui_out_text (uiout, "Transfer rate: "); 2070 if (time_count > 0) 2071 { 2072 unsigned long rate = ((ULONGEST) data_count * 1000) / time_count; 2073 2074 if (ui_out_is_mi_like_p (uiout)) 2075 { 2076 ui_out_field_fmt (uiout, "transfer-rate", "%lu", rate * 8); 2077 ui_out_text (uiout, " bits/sec"); 2078 } 2079 else if (rate < 1024) 2080 { 2081 ui_out_field_fmt (uiout, "transfer-rate", "%lu", rate); 2082 ui_out_text (uiout, " bytes/sec"); 2083 } 2084 else 2085 { 2086 ui_out_field_fmt (uiout, "transfer-rate", "%lu", rate / 1024); 2087 ui_out_text (uiout, " KB/sec"); 2088 } 2089 } 2090 else 2091 { 2092 ui_out_field_fmt (uiout, "transferred-bits", "%lu", (data_count * 8)); 2093 ui_out_text (uiout, " bits in <1 sec"); 2094 } 2095 if (write_count > 0) 2096 { 2097 ui_out_text (uiout, ", "); 2098 ui_out_field_fmt (uiout, "write-rate", "%lu", data_count / write_count); 2099 ui_out_text (uiout, " bytes/write"); 2100 } 2101 ui_out_text (uiout, ".\n"); 2102 } 2103 2104 /* This function allows the addition of incrementally linked object files. 2105 It does not modify any state in the target, only in the debugger. */ 2106 /* Note: ezannoni 2000-04-13 This function/command used to have a 2107 special case syntax for the rombug target (Rombug is the boot 2108 monitor for Microware's OS-9 / OS-9000, see remote-os9k.c). In the 2109 rombug case, the user doesn't need to supply a text address, 2110 instead a call to target_link() (in target.c) would supply the 2111 value to use. We are now discontinuing this type of ad hoc syntax. */ 2112 2113 static void 2114 add_symbol_file_command (char *args, int from_tty) 2115 { 2116 struct gdbarch *gdbarch = get_current_arch (); 2117 char *filename = NULL; 2118 int flags = OBJF_USERLOADED; 2119 char *arg; 2120 int section_index = 0; 2121 int argcnt = 0; 2122 int sec_num = 0; 2123 int i; 2124 int expecting_sec_name = 0; 2125 int expecting_sec_addr = 0; 2126 char **argv; 2127 2128 struct sect_opt 2129 { 2130 char *name; 2131 char *value; 2132 }; 2133 2134 struct section_addr_info *section_addrs; 2135 struct sect_opt *sect_opts = NULL; 2136 size_t num_sect_opts = 0; 2137 struct cleanup *my_cleanups = make_cleanup (null_cleanup, NULL); 2138 2139 num_sect_opts = 16; 2140 sect_opts = (struct sect_opt *) xmalloc (num_sect_opts 2141 * sizeof (struct sect_opt)); 2142 2143 dont_repeat (); 2144 2145 if (args == NULL) 2146 error (_("add-symbol-file takes a file name and an address")); 2147 2148 argv = gdb_buildargv (args); 2149 make_cleanup_freeargv (argv); 2150 2151 for (arg = argv[0], argcnt = 0; arg != NULL; arg = argv[++argcnt]) 2152 { 2153 /* Process the argument. */ 2154 if (argcnt == 0) 2155 { 2156 /* The first argument is the file name. */ 2157 filename = tilde_expand (arg); 2158 make_cleanup (xfree, filename); 2159 } 2160 else 2161 if (argcnt == 1) 2162 { 2163 /* The second argument is always the text address at which 2164 to load the program. */ 2165 sect_opts[section_index].name = ".text"; 2166 sect_opts[section_index].value = arg; 2167 if (++section_index >= num_sect_opts) 2168 { 2169 num_sect_opts *= 2; 2170 sect_opts = ((struct sect_opt *) 2171 xrealloc (sect_opts, 2172 num_sect_opts 2173 * sizeof (struct sect_opt))); 2174 } 2175 } 2176 else 2177 { 2178 /* It's an option (starting with '-') or it's an argument 2179 to an option */ 2180 2181 if (*arg == '-') 2182 { 2183 if (strcmp (arg, "-readnow") == 0) 2184 flags |= OBJF_READNOW; 2185 else if (strcmp (arg, "-s") == 0) 2186 { 2187 expecting_sec_name = 1; 2188 expecting_sec_addr = 1; 2189 } 2190 } 2191 else 2192 { 2193 if (expecting_sec_name) 2194 { 2195 sect_opts[section_index].name = arg; 2196 expecting_sec_name = 0; 2197 } 2198 else 2199 if (expecting_sec_addr) 2200 { 2201 sect_opts[section_index].value = arg; 2202 expecting_sec_addr = 0; 2203 if (++section_index >= num_sect_opts) 2204 { 2205 num_sect_opts *= 2; 2206 sect_opts = ((struct sect_opt *) 2207 xrealloc (sect_opts, 2208 num_sect_opts 2209 * sizeof (struct sect_opt))); 2210 } 2211 } 2212 else 2213 error (_("USAGE: add-symbol-file <filename> <textaddress> [-mapped] [-readnow] [-s <secname> <addr>]*")); 2214 } 2215 } 2216 } 2217 2218 /* This command takes at least two arguments. The first one is a 2219 filename, and the second is the address where this file has been 2220 loaded. Abort now if this address hasn't been provided by the 2221 user. */ 2222 if (section_index < 1) 2223 error (_("The address where %s has been loaded is missing"), filename); 2224 2225 /* Print the prompt for the query below. And save the arguments into 2226 a sect_addr_info structure to be passed around to other 2227 functions. We have to split this up into separate print 2228 statements because hex_string returns a local static 2229 string. */ 2230 2231 printf_unfiltered (_("add symbol table from file \"%s\" at\n"), filename); 2232 section_addrs = alloc_section_addr_info (section_index); 2233 make_cleanup (xfree, section_addrs); 2234 for (i = 0; i < section_index; i++) 2235 { 2236 CORE_ADDR addr; 2237 char *val = sect_opts[i].value; 2238 char *sec = sect_opts[i].name; 2239 2240 addr = parse_and_eval_address (val); 2241 2242 /* Here we store the section offsets in the order they were 2243 entered on the command line. */ 2244 section_addrs->other[sec_num].name = sec; 2245 section_addrs->other[sec_num].addr = addr; 2246 printf_unfiltered ("\t%s_addr = %s\n", sec, 2247 paddress (gdbarch, addr)); 2248 sec_num++; 2249 2250 /* The object's sections are initialized when a 2251 call is made to build_objfile_section_table (objfile). 2252 This happens in reread_symbols. 2253 At this point, we don't know what file type this is, 2254 so we can't determine what section names are valid. */ 2255 } 2256 2257 if (from_tty && (!query ("%s", ""))) 2258 error (_("Not confirmed.")); 2259 2260 symbol_file_add (filename, from_tty ? SYMFILE_VERBOSE : 0, 2261 section_addrs, flags); 2262 2263 /* Getting new symbols may change our opinion about what is 2264 frameless. */ 2265 reinit_frame_cache (); 2266 do_cleanups (my_cleanups); 2267 } 2268 2269 2270 /* Re-read symbols if a symbol-file has changed. */ 2271 void 2272 reread_symbols (void) 2273 { 2274 struct objfile *objfile; 2275 long new_modtime; 2276 int reread_one = 0; 2277 struct stat new_statbuf; 2278 int res; 2279 2280 /* With the addition of shared libraries, this should be modified, 2281 the load time should be saved in the partial symbol tables, since 2282 different tables may come from different source files. FIXME. 2283 This routine should then walk down each partial symbol table 2284 and see if the symbol table that it originates from has been changed */ 2285 2286 for (objfile = object_files; objfile; objfile = objfile->next) 2287 { 2288 /* solib-sunos.c creates one objfile with obfd. */ 2289 if (objfile->obfd == NULL) 2290 continue; 2291 2292 /* Separate debug objfiles are handled in the main objfile. */ 2293 if (objfile->separate_debug_objfile_backlink) 2294 continue; 2295 2296 /* If this object is from an archive (what you usually create with 2297 `ar', often called a `static library' on most systems, though 2298 a `shared library' on AIX is also an archive), then you should 2299 stat on the archive name, not member name. */ 2300 if (objfile->obfd->my_archive) 2301 res = stat (objfile->obfd->my_archive->filename, &new_statbuf); 2302 else 2303 res = stat (objfile->name, &new_statbuf); 2304 if (res != 0) 2305 { 2306 /* FIXME, should use print_sys_errmsg but it's not filtered. */ 2307 printf_unfiltered (_("`%s' has disappeared; keeping its symbols.\n"), 2308 objfile->name); 2309 continue; 2310 } 2311 new_modtime = new_statbuf.st_mtime; 2312 if (new_modtime != objfile->mtime) 2313 { 2314 struct cleanup *old_cleanups; 2315 struct section_offsets *offsets; 2316 int num_offsets; 2317 char *obfd_filename; 2318 2319 printf_unfiltered (_("`%s' has changed; re-reading symbols.\n"), 2320 objfile->name); 2321 2322 /* There are various functions like symbol_file_add, 2323 symfile_bfd_open, syms_from_objfile, etc., which might 2324 appear to do what we want. But they have various other 2325 effects which we *don't* want. So we just do stuff 2326 ourselves. We don't worry about mapped files (for one thing, 2327 any mapped file will be out of date). */ 2328 2329 /* If we get an error, blow away this objfile (not sure if 2330 that is the correct response for things like shared 2331 libraries). */ 2332 old_cleanups = make_cleanup_free_objfile (objfile); 2333 /* We need to do this whenever any symbols go away. */ 2334 make_cleanup (clear_symtab_users_cleanup, 0 /*ignore*/); 2335 2336 if (exec_bfd != NULL && strcmp (bfd_get_filename (objfile->obfd), 2337 bfd_get_filename (exec_bfd)) == 0) 2338 { 2339 /* Reload EXEC_BFD without asking anything. */ 2340 2341 exec_file_attach (bfd_get_filename (objfile->obfd), 0); 2342 } 2343 2344 /* Clean up any state BFD has sitting around. We don't need 2345 to close the descriptor but BFD lacks a way of closing the 2346 BFD without closing the descriptor. */ 2347 obfd_filename = bfd_get_filename (objfile->obfd); 2348 if (!bfd_close (objfile->obfd)) 2349 error (_("Can't close BFD for %s: %s"), objfile->name, 2350 bfd_errmsg (bfd_get_error ())); 2351 objfile->obfd = bfd_open_maybe_remote (obfd_filename); 2352 if (objfile->obfd == NULL) 2353 error (_("Can't open %s to read symbols."), objfile->name); 2354 else 2355 objfile->obfd = gdb_bfd_ref (objfile->obfd); 2356 /* bfd_openr sets cacheable to true, which is what we want. */ 2357 if (!bfd_check_format (objfile->obfd, bfd_object)) 2358 error (_("Can't read symbols from %s: %s."), objfile->name, 2359 bfd_errmsg (bfd_get_error ())); 2360 2361 /* Save the offsets, we will nuke them with the rest of the 2362 objfile_obstack. */ 2363 num_offsets = objfile->num_sections; 2364 offsets = ((struct section_offsets *) 2365 alloca (SIZEOF_N_SECTION_OFFSETS (num_offsets))); 2366 memcpy (offsets, objfile->section_offsets, 2367 SIZEOF_N_SECTION_OFFSETS (num_offsets)); 2368 2369 /* Remove any references to this objfile in the global 2370 value lists. */ 2371 preserve_values (objfile); 2372 2373 /* Nuke all the state that we will re-read. Much of the following 2374 code which sets things to NULL really is necessary to tell 2375 other parts of GDB that there is nothing currently there. 2376 2377 Try to keep the freeing order compatible with free_objfile. */ 2378 2379 if (objfile->sf != NULL) 2380 { 2381 (*objfile->sf->sym_finish) (objfile); 2382 } 2383 2384 clear_objfile_data (objfile); 2385 2386 /* Free the separate debug objfiles. It will be 2387 automatically recreated by sym_read. */ 2388 free_objfile_separate_debug (objfile); 2389 2390 /* FIXME: Do we have to free a whole linked list, or is this 2391 enough? */ 2392 if (objfile->global_psymbols.list) 2393 xfree (objfile->global_psymbols.list); 2394 memset (&objfile->global_psymbols, 0, 2395 sizeof (objfile->global_psymbols)); 2396 if (objfile->static_psymbols.list) 2397 xfree (objfile->static_psymbols.list); 2398 memset (&objfile->static_psymbols, 0, 2399 sizeof (objfile->static_psymbols)); 2400 2401 /* Free the obstacks for non-reusable objfiles */ 2402 bcache_xfree (objfile->psymbol_cache); 2403 objfile->psymbol_cache = bcache_xmalloc (); 2404 bcache_xfree (objfile->macro_cache); 2405 objfile->macro_cache = bcache_xmalloc (); 2406 bcache_xfree (objfile->filename_cache); 2407 objfile->filename_cache = bcache_xmalloc (); 2408 if (objfile->demangled_names_hash != NULL) 2409 { 2410 htab_delete (objfile->demangled_names_hash); 2411 objfile->demangled_names_hash = NULL; 2412 } 2413 obstack_free (&objfile->objfile_obstack, 0); 2414 objfile->sections = NULL; 2415 objfile->symtabs = NULL; 2416 objfile->psymtabs = NULL; 2417 objfile->psymtabs_addrmap = NULL; 2418 objfile->free_psymtabs = NULL; 2419 objfile->cp_namespace_symtab = NULL; 2420 objfile->msymbols = NULL; 2421 objfile->deprecated_sym_private = NULL; 2422 objfile->minimal_symbol_count = 0; 2423 memset (&objfile->msymbol_hash, 0, 2424 sizeof (objfile->msymbol_hash)); 2425 memset (&objfile->msymbol_demangled_hash, 0, 2426 sizeof (objfile->msymbol_demangled_hash)); 2427 2428 objfile->psymbol_cache = bcache_xmalloc (); 2429 objfile->macro_cache = bcache_xmalloc (); 2430 objfile->filename_cache = bcache_xmalloc (); 2431 /* obstack_init also initializes the obstack so it is 2432 empty. We could use obstack_specify_allocation but 2433 gdb_obstack.h specifies the alloc/dealloc 2434 functions. */ 2435 obstack_init (&objfile->objfile_obstack); 2436 if (build_objfile_section_table (objfile)) 2437 { 2438 error (_("Can't find the file sections in `%s': %s"), 2439 objfile->name, bfd_errmsg (bfd_get_error ())); 2440 } 2441 terminate_minimal_symbol_table (objfile); 2442 2443 /* We use the same section offsets as from last time. I'm not 2444 sure whether that is always correct for shared libraries. */ 2445 objfile->section_offsets = (struct section_offsets *) 2446 obstack_alloc (&objfile->objfile_obstack, 2447 SIZEOF_N_SECTION_OFFSETS (num_offsets)); 2448 memcpy (objfile->section_offsets, offsets, 2449 SIZEOF_N_SECTION_OFFSETS (num_offsets)); 2450 objfile->num_sections = num_offsets; 2451 2452 /* What the hell is sym_new_init for, anyway? The concept of 2453 distinguishing between the main file and additional files 2454 in this way seems rather dubious. */ 2455 if (objfile == symfile_objfile) 2456 { 2457 (*objfile->sf->sym_new_init) (objfile); 2458 } 2459 2460 (*objfile->sf->sym_init) (objfile); 2461 clear_complaints (&symfile_complaints, 1, 1); 2462 /* Do not set flags as this is safe and we don't want to be 2463 verbose. */ 2464 (*objfile->sf->sym_read) (objfile, 0); 2465 if (!objfile_has_symbols (objfile)) 2466 { 2467 wrap_here (""); 2468 printf_unfiltered (_("(no debugging symbols found)\n")); 2469 wrap_here (""); 2470 } 2471 2472 /* We're done reading the symbol file; finish off complaints. */ 2473 clear_complaints (&symfile_complaints, 0, 1); 2474 2475 /* Getting new symbols may change our opinion about what is 2476 frameless. */ 2477 2478 reinit_frame_cache (); 2479 2480 /* Discard cleanups as symbol reading was successful. */ 2481 discard_cleanups (old_cleanups); 2482 2483 /* If the mtime has changed between the time we set new_modtime 2484 and now, we *want* this to be out of date, so don't call stat 2485 again now. */ 2486 objfile->mtime = new_modtime; 2487 reread_one = 1; 2488 init_entry_point_info (objfile); 2489 } 2490 } 2491 2492 if (reread_one) 2493 { 2494 /* Notify objfiles that we've modified objfile sections. */ 2495 objfiles_changed (); 2496 2497 clear_symtab_users (); 2498 /* At least one objfile has changed, so we can consider that 2499 the executable we're debugging has changed too. */ 2500 observer_notify_executable_changed (); 2501 } 2502 } 2503 2504 2505 2506 typedef struct 2507 { 2508 char *ext; 2509 enum language lang; 2510 } 2511 filename_language; 2512 2513 static filename_language *filename_language_table; 2514 static int fl_table_size, fl_table_next; 2515 2516 static void 2517 add_filename_language (char *ext, enum language lang) 2518 { 2519 if (fl_table_next >= fl_table_size) 2520 { 2521 fl_table_size += 10; 2522 filename_language_table = 2523 xrealloc (filename_language_table, 2524 fl_table_size * sizeof (*filename_language_table)); 2525 } 2526 2527 filename_language_table[fl_table_next].ext = xstrdup (ext); 2528 filename_language_table[fl_table_next].lang = lang; 2529 fl_table_next++; 2530 } 2531 2532 static char *ext_args; 2533 static void 2534 show_ext_args (struct ui_file *file, int from_tty, 2535 struct cmd_list_element *c, const char *value) 2536 { 2537 fprintf_filtered (file, _("\ 2538 Mapping between filename extension and source language is \"%s\".\n"), 2539 value); 2540 } 2541 2542 static void 2543 set_ext_lang_command (char *args, int from_tty, struct cmd_list_element *e) 2544 { 2545 int i; 2546 char *cp = ext_args; 2547 enum language lang; 2548 2549 /* First arg is filename extension, starting with '.' */ 2550 if (*cp != '.') 2551 error (_("'%s': Filename extension must begin with '.'"), ext_args); 2552 2553 /* Find end of first arg. */ 2554 while (*cp && !isspace (*cp)) 2555 cp++; 2556 2557 if (*cp == '\0') 2558 error (_("'%s': two arguments required -- filename extension and language"), 2559 ext_args); 2560 2561 /* Null-terminate first arg */ 2562 *cp++ = '\0'; 2563 2564 /* Find beginning of second arg, which should be a source language. */ 2565 while (*cp && isspace (*cp)) 2566 cp++; 2567 2568 if (*cp == '\0') 2569 error (_("'%s': two arguments required -- filename extension and language"), 2570 ext_args); 2571 2572 /* Lookup the language from among those we know. */ 2573 lang = language_enum (cp); 2574 2575 /* Now lookup the filename extension: do we already know it? */ 2576 for (i = 0; i < fl_table_next; i++) 2577 if (0 == strcmp (ext_args, filename_language_table[i].ext)) 2578 break; 2579 2580 if (i >= fl_table_next) 2581 { 2582 /* new file extension */ 2583 add_filename_language (ext_args, lang); 2584 } 2585 else 2586 { 2587 /* redefining a previously known filename extension */ 2588 2589 /* if (from_tty) */ 2590 /* query ("Really make files of type %s '%s'?", */ 2591 /* ext_args, language_str (lang)); */ 2592 2593 xfree (filename_language_table[i].ext); 2594 filename_language_table[i].ext = xstrdup (ext_args); 2595 filename_language_table[i].lang = lang; 2596 } 2597 } 2598 2599 static void 2600 info_ext_lang_command (char *args, int from_tty) 2601 { 2602 int i; 2603 2604 printf_filtered (_("Filename extensions and the languages they represent:")); 2605 printf_filtered ("\n\n"); 2606 for (i = 0; i < fl_table_next; i++) 2607 printf_filtered ("\t%s\t- %s\n", 2608 filename_language_table[i].ext, 2609 language_str (filename_language_table[i].lang)); 2610 } 2611 2612 static void 2613 init_filename_language_table (void) 2614 { 2615 if (fl_table_size == 0) /* protect against repetition */ 2616 { 2617 fl_table_size = 20; 2618 fl_table_next = 0; 2619 filename_language_table = 2620 xmalloc (fl_table_size * sizeof (*filename_language_table)); 2621 add_filename_language (".c", language_c); 2622 add_filename_language (".d", language_d); 2623 add_filename_language (".C", language_cplus); 2624 add_filename_language (".cc", language_cplus); 2625 add_filename_language (".cp", language_cplus); 2626 add_filename_language (".cpp", language_cplus); 2627 add_filename_language (".cxx", language_cplus); 2628 add_filename_language (".c++", language_cplus); 2629 add_filename_language (".java", language_java); 2630 add_filename_language (".class", language_java); 2631 add_filename_language (".m", language_objc); 2632 add_filename_language (".f", language_fortran); 2633 add_filename_language (".F", language_fortran); 2634 add_filename_language (".for", language_fortran); 2635 add_filename_language (".FOR", language_fortran); 2636 add_filename_language (".ftn", language_fortran); 2637 add_filename_language (".FTN", language_fortran); 2638 add_filename_language (".fpp", language_fortran); 2639 add_filename_language (".FPP", language_fortran); 2640 add_filename_language (".f90", language_fortran); 2641 add_filename_language (".F90", language_fortran); 2642 add_filename_language (".f95", language_fortran); 2643 add_filename_language (".F95", language_fortran); 2644 add_filename_language (".f03", language_fortran); 2645 add_filename_language (".F03", language_fortran); 2646 add_filename_language (".f08", language_fortran); 2647 add_filename_language (".F08", language_fortran); 2648 add_filename_language (".s", language_asm); 2649 add_filename_language (".sx", language_asm); 2650 add_filename_language (".S", language_asm); 2651 add_filename_language (".pas", language_pascal); 2652 add_filename_language (".p", language_pascal); 2653 add_filename_language (".pp", language_pascal); 2654 add_filename_language (".adb", language_ada); 2655 add_filename_language (".ads", language_ada); 2656 add_filename_language (".a", language_ada); 2657 add_filename_language (".ada", language_ada); 2658 add_filename_language (".dg", language_ada); 2659 } 2660 } 2661 2662 enum language 2663 deduce_language_from_filename (char *filename) 2664 { 2665 int i; 2666 char *cp; 2667 2668 if (filename != NULL) 2669 if ((cp = strrchr (filename, '.')) != NULL) 2670 for (i = 0; i < fl_table_next; i++) 2671 if (strcmp (cp, filename_language_table[i].ext) == 0) 2672 return filename_language_table[i].lang; 2673 2674 return language_unknown; 2675 } 2676 2677 /* allocate_symtab: 2678 2679 Allocate and partly initialize a new symbol table. Return a pointer 2680 to it. error() if no space. 2681 2682 Caller must set these fields: 2683 LINETABLE(symtab) 2684 symtab->blockvector 2685 symtab->dirname 2686 symtab->free_code 2687 symtab->free_ptr 2688 */ 2689 2690 struct symtab * 2691 allocate_symtab (char *filename, struct objfile *objfile) 2692 { 2693 struct symtab *symtab; 2694 2695 symtab = (struct symtab *) 2696 obstack_alloc (&objfile->objfile_obstack, sizeof (struct symtab)); 2697 memset (symtab, 0, sizeof (*symtab)); 2698 symtab->filename = (char *) bcache (filename, strlen (filename) + 1, 2699 objfile->filename_cache); 2700 symtab->fullname = NULL; 2701 symtab->language = deduce_language_from_filename (filename); 2702 symtab->debugformat = "unknown"; 2703 2704 /* Hook it to the objfile it comes from */ 2705 2706 symtab->objfile = objfile; 2707 symtab->next = objfile->symtabs; 2708 objfile->symtabs = symtab; 2709 2710 return (symtab); 2711 } 2712 2713 2714 /* Reset all data structures in gdb which may contain references to symbol 2715 table data. */ 2716 2717 void 2718 clear_symtab_users (void) 2719 { 2720 /* Someday, we should do better than this, by only blowing away 2721 the things that really need to be blown. */ 2722 2723 /* Clear the "current" symtab first, because it is no longer valid. 2724 breakpoint_re_set may try to access the current symtab. */ 2725 clear_current_source_symtab_and_line (); 2726 2727 clear_displays (); 2728 breakpoint_re_set (); 2729 set_default_breakpoint (0, NULL, 0, 0, 0); 2730 clear_pc_function_cache (); 2731 observer_notify_new_objfile (NULL); 2732 2733 /* Clear globals which might have pointed into a removed objfile. 2734 FIXME: It's not clear which of these are supposed to persist 2735 between expressions and which ought to be reset each time. */ 2736 expression_context_block = NULL; 2737 innermost_block = NULL; 2738 2739 /* Varobj may refer to old symbols, perform a cleanup. */ 2740 varobj_invalidate (); 2741 2742 } 2743 2744 static void 2745 clear_symtab_users_cleanup (void *ignore) 2746 { 2747 clear_symtab_users (); 2748 } 2749 2750 /* OVERLAYS: 2751 The following code implements an abstraction for debugging overlay sections. 2752 2753 The target model is as follows: 2754 1) The gnu linker will permit multiple sections to be mapped into the 2755 same VMA, each with its own unique LMA (or load address). 2756 2) It is assumed that some runtime mechanism exists for mapping the 2757 sections, one by one, from the load address into the VMA address. 2758 3) This code provides a mechanism for gdb to keep track of which 2759 sections should be considered to be mapped from the VMA to the LMA. 2760 This information is used for symbol lookup, and memory read/write. 2761 For instance, if a section has been mapped then its contents 2762 should be read from the VMA, otherwise from the LMA. 2763 2764 Two levels of debugger support for overlays are available. One is 2765 "manual", in which the debugger relies on the user to tell it which 2766 overlays are currently mapped. This level of support is 2767 implemented entirely in the core debugger, and the information about 2768 whether a section is mapped is kept in the objfile->obj_section table. 2769 2770 The second level of support is "automatic", and is only available if 2771 the target-specific code provides functionality to read the target's 2772 overlay mapping table, and translate its contents for the debugger 2773 (by updating the mapped state information in the obj_section tables). 2774 2775 The interface is as follows: 2776 User commands: 2777 overlay map <name> -- tell gdb to consider this section mapped 2778 overlay unmap <name> -- tell gdb to consider this section unmapped 2779 overlay list -- list the sections that GDB thinks are mapped 2780 overlay read-target -- get the target's state of what's mapped 2781 overlay off/manual/auto -- set overlay debugging state 2782 Functional interface: 2783 find_pc_mapped_section(pc): if the pc is in the range of a mapped 2784 section, return that section. 2785 find_pc_overlay(pc): find any overlay section that contains 2786 the pc, either in its VMA or its LMA 2787 section_is_mapped(sect): true if overlay is marked as mapped 2788 section_is_overlay(sect): true if section's VMA != LMA 2789 pc_in_mapped_range(pc,sec): true if pc belongs to section's VMA 2790 pc_in_unmapped_range(...): true if pc belongs to section's LMA 2791 sections_overlap(sec1, sec2): true if mapped sec1 and sec2 ranges overlap 2792 overlay_mapped_address(...): map an address from section's LMA to VMA 2793 overlay_unmapped_address(...): map an address from section's VMA to LMA 2794 symbol_overlayed_address(...): Return a "current" address for symbol: 2795 either in VMA or LMA depending on whether 2796 the symbol's section is currently mapped 2797 */ 2798 2799 /* Overlay debugging state: */ 2800 2801 enum overlay_debugging_state overlay_debugging = ovly_off; 2802 int overlay_cache_invalid = 0; /* True if need to refresh mapped state */ 2803 2804 /* Function: section_is_overlay (SECTION) 2805 Returns true if SECTION has VMA not equal to LMA, ie. 2806 SECTION is loaded at an address different from where it will "run". */ 2807 2808 int 2809 section_is_overlay (struct obj_section *section) 2810 { 2811 if (overlay_debugging && section) 2812 { 2813 bfd *abfd = section->objfile->obfd; 2814 asection *bfd_section = section->the_bfd_section; 2815 2816 if (bfd_section_lma (abfd, bfd_section) != 0 2817 && bfd_section_lma (abfd, bfd_section) 2818 != bfd_section_vma (abfd, bfd_section)) 2819 return 1; 2820 } 2821 2822 return 0; 2823 } 2824 2825 /* Function: overlay_invalidate_all (void) 2826 Invalidate the mapped state of all overlay sections (mark it as stale). */ 2827 2828 static void 2829 overlay_invalidate_all (void) 2830 { 2831 struct objfile *objfile; 2832 struct obj_section *sect; 2833 2834 ALL_OBJSECTIONS (objfile, sect) 2835 if (section_is_overlay (sect)) 2836 sect->ovly_mapped = -1; 2837 } 2838 2839 /* Function: section_is_mapped (SECTION) 2840 Returns true if section is an overlay, and is currently mapped. 2841 2842 Access to the ovly_mapped flag is restricted to this function, so 2843 that we can do automatic update. If the global flag 2844 OVERLAY_CACHE_INVALID is set (by wait_for_inferior), then call 2845 overlay_invalidate_all. If the mapped state of the particular 2846 section is stale, then call TARGET_OVERLAY_UPDATE to refresh it. */ 2847 2848 int 2849 section_is_mapped (struct obj_section *osect) 2850 { 2851 struct gdbarch *gdbarch; 2852 2853 if (osect == 0 || !section_is_overlay (osect)) 2854 return 0; 2855 2856 switch (overlay_debugging) 2857 { 2858 default: 2859 case ovly_off: 2860 return 0; /* overlay debugging off */ 2861 case ovly_auto: /* overlay debugging automatic */ 2862 /* Unles there is a gdbarch_overlay_update function, 2863 there's really nothing useful to do here (can't really go auto) */ 2864 gdbarch = get_objfile_arch (osect->objfile); 2865 if (gdbarch_overlay_update_p (gdbarch)) 2866 { 2867 if (overlay_cache_invalid) 2868 { 2869 overlay_invalidate_all (); 2870 overlay_cache_invalid = 0; 2871 } 2872 if (osect->ovly_mapped == -1) 2873 gdbarch_overlay_update (gdbarch, osect); 2874 } 2875 /* fall thru to manual case */ 2876 case ovly_on: /* overlay debugging manual */ 2877 return osect->ovly_mapped == 1; 2878 } 2879 } 2880 2881 /* Function: pc_in_unmapped_range 2882 If PC falls into the lma range of SECTION, return true, else false. */ 2883 2884 CORE_ADDR 2885 pc_in_unmapped_range (CORE_ADDR pc, struct obj_section *section) 2886 { 2887 if (section_is_overlay (section)) 2888 { 2889 bfd *abfd = section->objfile->obfd; 2890 asection *bfd_section = section->the_bfd_section; 2891 2892 /* We assume the LMA is relocated by the same offset as the VMA. */ 2893 bfd_vma size = bfd_get_section_size (bfd_section); 2894 CORE_ADDR offset = obj_section_offset (section); 2895 2896 if (bfd_get_section_lma (abfd, bfd_section) + offset <= pc 2897 && pc < bfd_get_section_lma (abfd, bfd_section) + offset + size) 2898 return 1; 2899 } 2900 2901 return 0; 2902 } 2903 2904 /* Function: pc_in_mapped_range 2905 If PC falls into the vma range of SECTION, return true, else false. */ 2906 2907 CORE_ADDR 2908 pc_in_mapped_range (CORE_ADDR pc, struct obj_section *section) 2909 { 2910 if (section_is_overlay (section)) 2911 { 2912 if (obj_section_addr (section) <= pc 2913 && pc < obj_section_endaddr (section)) 2914 return 1; 2915 } 2916 2917 return 0; 2918 } 2919 2920 2921 /* Return true if the mapped ranges of sections A and B overlap, false 2922 otherwise. */ 2923 static int 2924 sections_overlap (struct obj_section *a, struct obj_section *b) 2925 { 2926 CORE_ADDR a_start = obj_section_addr (a); 2927 CORE_ADDR a_end = obj_section_endaddr (a); 2928 CORE_ADDR b_start = obj_section_addr (b); 2929 CORE_ADDR b_end = obj_section_endaddr (b); 2930 2931 return (a_start < b_end && b_start < a_end); 2932 } 2933 2934 /* Function: overlay_unmapped_address (PC, SECTION) 2935 Returns the address corresponding to PC in the unmapped (load) range. 2936 May be the same as PC. */ 2937 2938 CORE_ADDR 2939 overlay_unmapped_address (CORE_ADDR pc, struct obj_section *section) 2940 { 2941 if (section_is_overlay (section) && pc_in_mapped_range (pc, section)) 2942 { 2943 bfd *abfd = section->objfile->obfd; 2944 asection *bfd_section = section->the_bfd_section; 2945 2946 return pc + bfd_section_lma (abfd, bfd_section) 2947 - bfd_section_vma (abfd, bfd_section); 2948 } 2949 2950 return pc; 2951 } 2952 2953 /* Function: overlay_mapped_address (PC, SECTION) 2954 Returns the address corresponding to PC in the mapped (runtime) range. 2955 May be the same as PC. */ 2956 2957 CORE_ADDR 2958 overlay_mapped_address (CORE_ADDR pc, struct obj_section *section) 2959 { 2960 if (section_is_overlay (section) && pc_in_unmapped_range (pc, section)) 2961 { 2962 bfd *abfd = section->objfile->obfd; 2963 asection *bfd_section = section->the_bfd_section; 2964 2965 return pc + bfd_section_vma (abfd, bfd_section) 2966 - bfd_section_lma (abfd, bfd_section); 2967 } 2968 2969 return pc; 2970 } 2971 2972 2973 /* Function: symbol_overlayed_address 2974 Return one of two addresses (relative to the VMA or to the LMA), 2975 depending on whether the section is mapped or not. */ 2976 2977 CORE_ADDR 2978 symbol_overlayed_address (CORE_ADDR address, struct obj_section *section) 2979 { 2980 if (overlay_debugging) 2981 { 2982 /* If the symbol has no section, just return its regular address. */ 2983 if (section == 0) 2984 return address; 2985 /* If the symbol's section is not an overlay, just return its address */ 2986 if (!section_is_overlay (section)) 2987 return address; 2988 /* If the symbol's section is mapped, just return its address */ 2989 if (section_is_mapped (section)) 2990 return address; 2991 /* 2992 * HOWEVER: if the symbol is in an overlay section which is NOT mapped, 2993 * then return its LOADED address rather than its vma address!! 2994 */ 2995 return overlay_unmapped_address (address, section); 2996 } 2997 return address; 2998 } 2999 3000 /* Function: find_pc_overlay (PC) 3001 Return the best-match overlay section for PC: 3002 If PC matches a mapped overlay section's VMA, return that section. 3003 Else if PC matches an unmapped section's VMA, return that section. 3004 Else if PC matches an unmapped section's LMA, return that section. */ 3005 3006 struct obj_section * 3007 find_pc_overlay (CORE_ADDR pc) 3008 { 3009 struct objfile *objfile; 3010 struct obj_section *osect, *best_match = NULL; 3011 3012 if (overlay_debugging) 3013 ALL_OBJSECTIONS (objfile, osect) 3014 if (section_is_overlay (osect)) 3015 { 3016 if (pc_in_mapped_range (pc, osect)) 3017 { 3018 if (section_is_mapped (osect)) 3019 return osect; 3020 else 3021 best_match = osect; 3022 } 3023 else if (pc_in_unmapped_range (pc, osect)) 3024 best_match = osect; 3025 } 3026 return best_match; 3027 } 3028 3029 /* Function: find_pc_mapped_section (PC) 3030 If PC falls into the VMA address range of an overlay section that is 3031 currently marked as MAPPED, return that section. Else return NULL. */ 3032 3033 struct obj_section * 3034 find_pc_mapped_section (CORE_ADDR pc) 3035 { 3036 struct objfile *objfile; 3037 struct obj_section *osect; 3038 3039 if (overlay_debugging) 3040 ALL_OBJSECTIONS (objfile, osect) 3041 if (pc_in_mapped_range (pc, osect) && section_is_mapped (osect)) 3042 return osect; 3043 3044 return NULL; 3045 } 3046 3047 /* Function: list_overlays_command 3048 Print a list of mapped sections and their PC ranges */ 3049 3050 void 3051 list_overlays_command (char *args, int from_tty) 3052 { 3053 int nmapped = 0; 3054 struct objfile *objfile; 3055 struct obj_section *osect; 3056 3057 if (overlay_debugging) 3058 ALL_OBJSECTIONS (objfile, osect) 3059 if (section_is_mapped (osect)) 3060 { 3061 struct gdbarch *gdbarch = get_objfile_arch (objfile); 3062 const char *name; 3063 bfd_vma lma, vma; 3064 int size; 3065 3066 vma = bfd_section_vma (objfile->obfd, osect->the_bfd_section); 3067 lma = bfd_section_lma (objfile->obfd, osect->the_bfd_section); 3068 size = bfd_get_section_size (osect->the_bfd_section); 3069 name = bfd_section_name (objfile->obfd, osect->the_bfd_section); 3070 3071 printf_filtered ("Section %s, loaded at ", name); 3072 fputs_filtered (paddress (gdbarch, lma), gdb_stdout); 3073 puts_filtered (" - "); 3074 fputs_filtered (paddress (gdbarch, lma + size), gdb_stdout); 3075 printf_filtered (", mapped at "); 3076 fputs_filtered (paddress (gdbarch, vma), gdb_stdout); 3077 puts_filtered (" - "); 3078 fputs_filtered (paddress (gdbarch, vma + size), gdb_stdout); 3079 puts_filtered ("\n"); 3080 3081 nmapped++; 3082 } 3083 if (nmapped == 0) 3084 printf_filtered (_("No sections are mapped.\n")); 3085 } 3086 3087 /* Function: map_overlay_command 3088 Mark the named section as mapped (ie. residing at its VMA address). */ 3089 3090 void 3091 map_overlay_command (char *args, int from_tty) 3092 { 3093 struct objfile *objfile, *objfile2; 3094 struct obj_section *sec, *sec2; 3095 3096 if (!overlay_debugging) 3097 error (_("\ 3098 Overlay debugging not enabled. Use either the 'overlay auto' or\n\ 3099 the 'overlay manual' command.")); 3100 3101 if (args == 0 || *args == 0) 3102 error (_("Argument required: name of an overlay section")); 3103 3104 /* First, find a section matching the user supplied argument */ 3105 ALL_OBJSECTIONS (objfile, sec) 3106 if (!strcmp (bfd_section_name (objfile->obfd, sec->the_bfd_section), args)) 3107 { 3108 /* Now, check to see if the section is an overlay. */ 3109 if (!section_is_overlay (sec)) 3110 continue; /* not an overlay section */ 3111 3112 /* Mark the overlay as "mapped" */ 3113 sec->ovly_mapped = 1; 3114 3115 /* Next, make a pass and unmap any sections that are 3116 overlapped by this new section: */ 3117 ALL_OBJSECTIONS (objfile2, sec2) 3118 if (sec2->ovly_mapped && sec != sec2 && sections_overlap (sec, sec2)) 3119 { 3120 if (info_verbose) 3121 printf_unfiltered (_("Note: section %s unmapped by overlap\n"), 3122 bfd_section_name (objfile->obfd, 3123 sec2->the_bfd_section)); 3124 sec2->ovly_mapped = 0; /* sec2 overlaps sec: unmap sec2 */ 3125 } 3126 return; 3127 } 3128 error (_("No overlay section called %s"), args); 3129 } 3130 3131 /* Function: unmap_overlay_command 3132 Mark the overlay section as unmapped 3133 (ie. resident in its LMA address range, rather than the VMA range). */ 3134 3135 void 3136 unmap_overlay_command (char *args, int from_tty) 3137 { 3138 struct objfile *objfile; 3139 struct obj_section *sec; 3140 3141 if (!overlay_debugging) 3142 error (_("\ 3143 Overlay debugging not enabled. Use either the 'overlay auto' or\n\ 3144 the 'overlay manual' command.")); 3145 3146 if (args == 0 || *args == 0) 3147 error (_("Argument required: name of an overlay section")); 3148 3149 /* First, find a section matching the user supplied argument */ 3150 ALL_OBJSECTIONS (objfile, sec) 3151 if (!strcmp (bfd_section_name (objfile->obfd, sec->the_bfd_section), args)) 3152 { 3153 if (!sec->ovly_mapped) 3154 error (_("Section %s is not mapped"), args); 3155 sec->ovly_mapped = 0; 3156 return; 3157 } 3158 error (_("No overlay section called %s"), args); 3159 } 3160 3161 /* Function: overlay_auto_command 3162 A utility command to turn on overlay debugging. 3163 Possibly this should be done via a set/show command. */ 3164 3165 static void 3166 overlay_auto_command (char *args, int from_tty) 3167 { 3168 overlay_debugging = ovly_auto; 3169 enable_overlay_breakpoints (); 3170 if (info_verbose) 3171 printf_unfiltered (_("Automatic overlay debugging enabled.")); 3172 } 3173 3174 /* Function: overlay_manual_command 3175 A utility command to turn on overlay debugging. 3176 Possibly this should be done via a set/show command. */ 3177 3178 static void 3179 overlay_manual_command (char *args, int from_tty) 3180 { 3181 overlay_debugging = ovly_on; 3182 disable_overlay_breakpoints (); 3183 if (info_verbose) 3184 printf_unfiltered (_("Overlay debugging enabled.")); 3185 } 3186 3187 /* Function: overlay_off_command 3188 A utility command to turn on overlay debugging. 3189 Possibly this should be done via a set/show command. */ 3190 3191 static void 3192 overlay_off_command (char *args, int from_tty) 3193 { 3194 overlay_debugging = ovly_off; 3195 disable_overlay_breakpoints (); 3196 if (info_verbose) 3197 printf_unfiltered (_("Overlay debugging disabled.")); 3198 } 3199 3200 static void 3201 overlay_load_command (char *args, int from_tty) 3202 { 3203 struct gdbarch *gdbarch = get_current_arch (); 3204 3205 if (gdbarch_overlay_update_p (gdbarch)) 3206 gdbarch_overlay_update (gdbarch, NULL); 3207 else 3208 error (_("This target does not know how to read its overlay state.")); 3209 } 3210 3211 /* Function: overlay_command 3212 A place-holder for a mis-typed command */ 3213 3214 /* Command list chain containing all defined "overlay" subcommands. */ 3215 struct cmd_list_element *overlaylist; 3216 3217 static void 3218 overlay_command (char *args, int from_tty) 3219 { 3220 printf_unfiltered 3221 ("\"overlay\" must be followed by the name of an overlay command.\n"); 3222 help_list (overlaylist, "overlay ", -1, gdb_stdout); 3223 } 3224 3225 3226 /* Target Overlays for the "Simplest" overlay manager: 3227 3228 This is GDB's default target overlay layer. It works with the 3229 minimal overlay manager supplied as an example by Cygnus. The 3230 entry point is via a function pointer "gdbarch_overlay_update", 3231 so targets that use a different runtime overlay manager can 3232 substitute their own overlay_update function and take over the 3233 function pointer. 3234 3235 The overlay_update function pokes around in the target's data structures 3236 to see what overlays are mapped, and updates GDB's overlay mapping with 3237 this information. 3238 3239 In this simple implementation, the target data structures are as follows: 3240 unsigned _novlys; /# number of overlay sections #/ 3241 unsigned _ovly_table[_novlys][4] = { 3242 {VMA, SIZE, LMA, MAPPED}, /# one entry per overlay section #/ 3243 {..., ..., ..., ...}, 3244 } 3245 unsigned _novly_regions; /# number of overlay regions #/ 3246 unsigned _ovly_region_table[_novly_regions][3] = { 3247 {VMA, SIZE, MAPPED_TO_LMA}, /# one entry per overlay region #/ 3248 {..., ..., ...}, 3249 } 3250 These functions will attempt to update GDB's mappedness state in the 3251 symbol section table, based on the target's mappedness state. 3252 3253 To do this, we keep a cached copy of the target's _ovly_table, and 3254 attempt to detect when the cached copy is invalidated. The main 3255 entry point is "simple_overlay_update(SECT), which looks up SECT in 3256 the cached table and re-reads only the entry for that section from 3257 the target (whenever possible). 3258 */ 3259 3260 /* Cached, dynamically allocated copies of the target data structures: */ 3261 static unsigned (*cache_ovly_table)[4] = 0; 3262 #if 0 3263 static unsigned (*cache_ovly_region_table)[3] = 0; 3264 #endif 3265 static unsigned cache_novlys = 0; 3266 #if 0 3267 static unsigned cache_novly_regions = 0; 3268 #endif 3269 static CORE_ADDR cache_ovly_table_base = 0; 3270 #if 0 3271 static CORE_ADDR cache_ovly_region_table_base = 0; 3272 #endif 3273 enum ovly_index 3274 { 3275 VMA, SIZE, LMA, MAPPED 3276 }; 3277 3278 /* Throw away the cached copy of _ovly_table */ 3279 static void 3280 simple_free_overlay_table (void) 3281 { 3282 if (cache_ovly_table) 3283 xfree (cache_ovly_table); 3284 cache_novlys = 0; 3285 cache_ovly_table = NULL; 3286 cache_ovly_table_base = 0; 3287 } 3288 3289 #if 0 3290 /* Throw away the cached copy of _ovly_region_table */ 3291 static void 3292 simple_free_overlay_region_table (void) 3293 { 3294 if (cache_ovly_region_table) 3295 xfree (cache_ovly_region_table); 3296 cache_novly_regions = 0; 3297 cache_ovly_region_table = NULL; 3298 cache_ovly_region_table_base = 0; 3299 } 3300 #endif 3301 3302 /* Read an array of ints of size SIZE from the target into a local buffer. 3303 Convert to host order. int LEN is number of ints */ 3304 static void 3305 read_target_long_array (CORE_ADDR memaddr, unsigned int *myaddr, 3306 int len, int size, enum bfd_endian byte_order) 3307 { 3308 /* FIXME (alloca): Not safe if array is very large. */ 3309 gdb_byte *buf = alloca (len * size); 3310 int i; 3311 3312 read_memory (memaddr, buf, len * size); 3313 for (i = 0; i < len; i++) 3314 myaddr[i] = extract_unsigned_integer (size * i + buf, size, byte_order); 3315 } 3316 3317 /* Find and grab a copy of the target _ovly_table 3318 (and _novlys, which is needed for the table's size) */ 3319 static int 3320 simple_read_overlay_table (void) 3321 { 3322 struct minimal_symbol *novlys_msym, *ovly_table_msym; 3323 struct gdbarch *gdbarch; 3324 int word_size; 3325 enum bfd_endian byte_order; 3326 3327 simple_free_overlay_table (); 3328 novlys_msym = lookup_minimal_symbol ("_novlys", NULL, NULL); 3329 if (! novlys_msym) 3330 { 3331 error (_("Error reading inferior's overlay table: " 3332 "couldn't find `_novlys' variable\n" 3333 "in inferior. Use `overlay manual' mode.")); 3334 return 0; 3335 } 3336 3337 ovly_table_msym = lookup_minimal_symbol ("_ovly_table", NULL, NULL); 3338 if (! ovly_table_msym) 3339 { 3340 error (_("Error reading inferior's overlay table: couldn't find " 3341 "`_ovly_table' array\n" 3342 "in inferior. Use `overlay manual' mode.")); 3343 return 0; 3344 } 3345 3346 gdbarch = get_objfile_arch (msymbol_objfile (ovly_table_msym)); 3347 word_size = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT; 3348 byte_order = gdbarch_byte_order (gdbarch); 3349 3350 cache_novlys = read_memory_integer (SYMBOL_VALUE_ADDRESS (novlys_msym), 3351 4, byte_order); 3352 cache_ovly_table 3353 = (void *) xmalloc (cache_novlys * sizeof (*cache_ovly_table)); 3354 cache_ovly_table_base = SYMBOL_VALUE_ADDRESS (ovly_table_msym); 3355 read_target_long_array (cache_ovly_table_base, 3356 (unsigned int *) cache_ovly_table, 3357 cache_novlys * 4, word_size, byte_order); 3358 3359 return 1; /* SUCCESS */ 3360 } 3361 3362 #if 0 3363 /* Find and grab a copy of the target _ovly_region_table 3364 (and _novly_regions, which is needed for the table's size) */ 3365 static int 3366 simple_read_overlay_region_table (void) 3367 { 3368 struct minimal_symbol *msym; 3369 struct gdbarch *gdbarch; 3370 int word_size; 3371 enum bfd_endian byte_order; 3372 3373 simple_free_overlay_region_table (); 3374 msym = lookup_minimal_symbol ("_novly_regions", NULL, NULL); 3375 if (msym == NULL) 3376 return 0; /* failure */ 3377 3378 gdbarch = get_objfile_arch (msymbol_objfile (msym)); 3379 word_size = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT; 3380 byte_order = gdbarch_byte_order (gdbarch); 3381 3382 cache_novly_regions = read_memory_integer (SYMBOL_VALUE_ADDRESS (msym), 3383 4, byte_order); 3384 3385 cache_ovly_region_table = (void *) xmalloc (cache_novly_regions * 12); 3386 if (cache_ovly_region_table != NULL) 3387 { 3388 msym = lookup_minimal_symbol ("_ovly_region_table", NULL, NULL); 3389 if (msym != NULL) 3390 { 3391 cache_ovly_region_table_base = SYMBOL_VALUE_ADDRESS (msym); 3392 read_target_long_array (cache_ovly_region_table_base, 3393 (unsigned int *) cache_ovly_region_table, 3394 cache_novly_regions * 3, 3395 word_size, byte_order); 3396 } 3397 else 3398 return 0; /* failure */ 3399 } 3400 else 3401 return 0; /* failure */ 3402 return 1; /* SUCCESS */ 3403 } 3404 #endif 3405 3406 /* Function: simple_overlay_update_1 3407 A helper function for simple_overlay_update. Assuming a cached copy 3408 of _ovly_table exists, look through it to find an entry whose vma, 3409 lma and size match those of OSECT. Re-read the entry and make sure 3410 it still matches OSECT (else the table may no longer be valid). 3411 Set OSECT's mapped state to match the entry. Return: 1 for 3412 success, 0 for failure. */ 3413 3414 static int 3415 simple_overlay_update_1 (struct obj_section *osect) 3416 { 3417 int i, size; 3418 bfd *obfd = osect->objfile->obfd; 3419 asection *bsect = osect->the_bfd_section; 3420 struct gdbarch *gdbarch = get_objfile_arch (osect->objfile); 3421 int word_size = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT; 3422 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); 3423 3424 size = bfd_get_section_size (osect->the_bfd_section); 3425 for (i = 0; i < cache_novlys; i++) 3426 if (cache_ovly_table[i][VMA] == bfd_section_vma (obfd, bsect) 3427 && cache_ovly_table[i][LMA] == bfd_section_lma (obfd, bsect) 3428 /* && cache_ovly_table[i][SIZE] == size */ ) 3429 { 3430 read_target_long_array (cache_ovly_table_base + i * word_size, 3431 (unsigned int *) cache_ovly_table[i], 3432 4, word_size, byte_order); 3433 if (cache_ovly_table[i][VMA] == bfd_section_vma (obfd, bsect) 3434 && cache_ovly_table[i][LMA] == bfd_section_lma (obfd, bsect) 3435 /* && cache_ovly_table[i][SIZE] == size */ ) 3436 { 3437 osect->ovly_mapped = cache_ovly_table[i][MAPPED]; 3438 return 1; 3439 } 3440 else /* Warning! Warning! Target's ovly table has changed! */ 3441 return 0; 3442 } 3443 return 0; 3444 } 3445 3446 /* Function: simple_overlay_update 3447 If OSECT is NULL, then update all sections' mapped state 3448 (after re-reading the entire target _ovly_table). 3449 If OSECT is non-NULL, then try to find a matching entry in the 3450 cached ovly_table and update only OSECT's mapped state. 3451 If a cached entry can't be found or the cache isn't valid, then 3452 re-read the entire cache, and go ahead and update all sections. */ 3453 3454 void 3455 simple_overlay_update (struct obj_section *osect) 3456 { 3457 struct objfile *objfile; 3458 3459 /* Were we given an osect to look up? NULL means do all of them. */ 3460 if (osect) 3461 /* Have we got a cached copy of the target's overlay table? */ 3462 if (cache_ovly_table != NULL) 3463 /* Does its cached location match what's currently in the symtab? */ 3464 if (cache_ovly_table_base == 3465 SYMBOL_VALUE_ADDRESS (lookup_minimal_symbol ("_ovly_table", NULL, NULL))) 3466 /* Then go ahead and try to look up this single section in the cache */ 3467 if (simple_overlay_update_1 (osect)) 3468 /* Found it! We're done. */ 3469 return; 3470 3471 /* Cached table no good: need to read the entire table anew. 3472 Or else we want all the sections, in which case it's actually 3473 more efficient to read the whole table in one block anyway. */ 3474 3475 if (! simple_read_overlay_table ()) 3476 return; 3477 3478 /* Now may as well update all sections, even if only one was requested. */ 3479 ALL_OBJSECTIONS (objfile, osect) 3480 if (section_is_overlay (osect)) 3481 { 3482 int i, size; 3483 bfd *obfd = osect->objfile->obfd; 3484 asection *bsect = osect->the_bfd_section; 3485 3486 size = bfd_get_section_size (bsect); 3487 for (i = 0; i < cache_novlys; i++) 3488 if (cache_ovly_table[i][VMA] == bfd_section_vma (obfd, bsect) 3489 && cache_ovly_table[i][LMA] == bfd_section_lma (obfd, bsect) 3490 /* && cache_ovly_table[i][SIZE] == size */ ) 3491 { /* obj_section matches i'th entry in ovly_table */ 3492 osect->ovly_mapped = cache_ovly_table[i][MAPPED]; 3493 break; /* finished with inner for loop: break out */ 3494 } 3495 } 3496 } 3497 3498 /* Set the output sections and output offsets for section SECTP in 3499 ABFD. The relocation code in BFD will read these offsets, so we 3500 need to be sure they're initialized. We map each section to itself, 3501 with no offset; this means that SECTP->vma will be honored. */ 3502 3503 static void 3504 symfile_dummy_outputs (bfd *abfd, asection *sectp, void *dummy) 3505 { 3506 sectp->output_section = sectp; 3507 sectp->output_offset = 0; 3508 } 3509 3510 /* Default implementation for sym_relocate. */ 3511 3512 3513 bfd_byte * 3514 default_symfile_relocate (struct objfile *objfile, asection *sectp, 3515 bfd_byte *buf) 3516 { 3517 bfd *abfd = objfile->obfd; 3518 3519 /* We're only interested in sections with relocation 3520 information. */ 3521 if ((sectp->flags & SEC_RELOC) == 0) 3522 return NULL; 3523 3524 /* We will handle section offsets properly elsewhere, so relocate as if 3525 all sections begin at 0. */ 3526 bfd_map_over_sections (abfd, symfile_dummy_outputs, NULL); 3527 3528 return bfd_simple_get_relocated_section_contents (abfd, sectp, buf, NULL); 3529 } 3530 3531 /* Relocate the contents of a debug section SECTP in ABFD. The 3532 contents are stored in BUF if it is non-NULL, or returned in a 3533 malloc'd buffer otherwise. 3534 3535 For some platforms and debug info formats, shared libraries contain 3536 relocations against the debug sections (particularly for DWARF-2; 3537 one affected platform is PowerPC GNU/Linux, although it depends on 3538 the version of the linker in use). Also, ELF object files naturally 3539 have unresolved relocations for their debug sections. We need to apply 3540 the relocations in order to get the locations of symbols correct. 3541 Another example that may require relocation processing, is the 3542 DWARF-2 .eh_frame section in .o files, although it isn't strictly a 3543 debug section. */ 3544 3545 bfd_byte * 3546 symfile_relocate_debug_section (struct objfile *objfile, 3547 asection *sectp, bfd_byte *buf) 3548 { 3549 gdb_assert (objfile->sf->sym_relocate); 3550 3551 return (*objfile->sf->sym_relocate) (objfile, sectp, buf); 3552 } 3553 3554 struct symfile_segment_data * 3555 get_symfile_segment_data (bfd *abfd) 3556 { 3557 struct sym_fns *sf = find_sym_fns (abfd); 3558 3559 if (sf == NULL) 3560 return NULL; 3561 3562 return sf->sym_segments (abfd); 3563 } 3564 3565 void 3566 free_symfile_segment_data (struct symfile_segment_data *data) 3567 { 3568 xfree (data->segment_bases); 3569 xfree (data->segment_sizes); 3570 xfree (data->segment_info); 3571 xfree (data); 3572 } 3573 3574 3575 /* Given: 3576 - DATA, containing segment addresses from the object file ABFD, and 3577 the mapping from ABFD's sections onto the segments that own them, 3578 and 3579 - SEGMENT_BASES[0 .. NUM_SEGMENT_BASES - 1], holding the actual 3580 segment addresses reported by the target, 3581 store the appropriate offsets for each section in OFFSETS. 3582 3583 If there are fewer entries in SEGMENT_BASES than there are segments 3584 in DATA, then apply SEGMENT_BASES' last entry to all the segments. 3585 3586 If there are more entries, then ignore the extra. The target may 3587 not be able to distinguish between an empty data segment and a 3588 missing data segment; a missing text segment is less plausible. */ 3589 int 3590 symfile_map_offsets_to_segments (bfd *abfd, struct symfile_segment_data *data, 3591 struct section_offsets *offsets, 3592 int num_segment_bases, 3593 const CORE_ADDR *segment_bases) 3594 { 3595 int i; 3596 asection *sect; 3597 3598 /* It doesn't make sense to call this function unless you have some 3599 segment base addresses. */ 3600 gdb_assert (num_segment_bases > 0); 3601 3602 /* If we do not have segment mappings for the object file, we 3603 can not relocate it by segments. */ 3604 gdb_assert (data != NULL); 3605 gdb_assert (data->num_segments > 0); 3606 3607 for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next) 3608 { 3609 int which = data->segment_info[i]; 3610 3611 gdb_assert (0 <= which && which <= data->num_segments); 3612 3613 /* Don't bother computing offsets for sections that aren't 3614 loaded as part of any segment. */ 3615 if (! which) 3616 continue; 3617 3618 /* Use the last SEGMENT_BASES entry as the address of any extra 3619 segments mentioned in DATA->segment_info. */ 3620 if (which > num_segment_bases) 3621 which = num_segment_bases; 3622 3623 offsets->offsets[i] = (segment_bases[which - 1] 3624 - data->segment_bases[which - 1]); 3625 } 3626 3627 return 1; 3628 } 3629 3630 static void 3631 symfile_find_segment_sections (struct objfile *objfile) 3632 { 3633 bfd *abfd = objfile->obfd; 3634 int i; 3635 asection *sect; 3636 struct symfile_segment_data *data; 3637 3638 data = get_symfile_segment_data (objfile->obfd); 3639 if (data == NULL) 3640 return; 3641 3642 if (data->num_segments != 1 && data->num_segments != 2) 3643 { 3644 free_symfile_segment_data (data); 3645 return; 3646 } 3647 3648 for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next) 3649 { 3650 int which = data->segment_info[i]; 3651 3652 if (which == 1) 3653 { 3654 if (objfile->sect_index_text == -1) 3655 objfile->sect_index_text = sect->index; 3656 3657 if (objfile->sect_index_rodata == -1) 3658 objfile->sect_index_rodata = sect->index; 3659 } 3660 else if (which == 2) 3661 { 3662 if (objfile->sect_index_data == -1) 3663 objfile->sect_index_data = sect->index; 3664 3665 if (objfile->sect_index_bss == -1) 3666 objfile->sect_index_bss = sect->index; 3667 } 3668 } 3669 3670 free_symfile_segment_data (data); 3671 } 3672 3673 void 3674 _initialize_symfile (void) 3675 { 3676 struct cmd_list_element *c; 3677 3678 c = add_cmd ("symbol-file", class_files, symbol_file_command, _("\ 3679 Load symbol table from executable file FILE.\n\ 3680 The `file' command can also load symbol tables, as well as setting the file\n\ 3681 to execute."), &cmdlist); 3682 set_cmd_completer (c, filename_completer); 3683 3684 c = add_cmd ("add-symbol-file", class_files, add_symbol_file_command, _("\ 3685 Load symbols from FILE, assuming FILE has been dynamically loaded.\n\ 3686 Usage: add-symbol-file FILE ADDR [-s <SECT> <SECT_ADDR> -s <SECT> <SECT_ADDR> ...]\n\ 3687 ADDR is the starting address of the file's text.\n\ 3688 The optional arguments are section-name section-address pairs and\n\ 3689 should be specified if the data and bss segments are not contiguous\n\ 3690 with the text. SECT is a section name to be loaded at SECT_ADDR."), 3691 &cmdlist); 3692 set_cmd_completer (c, filename_completer); 3693 3694 c = add_cmd ("load", class_files, load_command, _("\ 3695 Dynamically load FILE into the running program, and record its symbols\n\ 3696 for access from GDB.\n\ 3697 A load OFFSET may also be given."), &cmdlist); 3698 set_cmd_completer (c, filename_completer); 3699 3700 add_setshow_boolean_cmd ("symbol-reloading", class_support, 3701 &symbol_reloading, _("\ 3702 Set dynamic symbol table reloading multiple times in one run."), _("\ 3703 Show dynamic symbol table reloading multiple times in one run."), NULL, 3704 NULL, 3705 show_symbol_reloading, 3706 &setlist, &showlist); 3707 3708 add_prefix_cmd ("overlay", class_support, overlay_command, 3709 _("Commands for debugging overlays."), &overlaylist, 3710 "overlay ", 0, &cmdlist); 3711 3712 add_com_alias ("ovly", "overlay", class_alias, 1); 3713 add_com_alias ("ov", "overlay", class_alias, 1); 3714 3715 add_cmd ("map-overlay", class_support, map_overlay_command, 3716 _("Assert that an overlay section is mapped."), &overlaylist); 3717 3718 add_cmd ("unmap-overlay", class_support, unmap_overlay_command, 3719 _("Assert that an overlay section is unmapped."), &overlaylist); 3720 3721 add_cmd ("list-overlays", class_support, list_overlays_command, 3722 _("List mappings of overlay sections."), &overlaylist); 3723 3724 add_cmd ("manual", class_support, overlay_manual_command, 3725 _("Enable overlay debugging."), &overlaylist); 3726 add_cmd ("off", class_support, overlay_off_command, 3727 _("Disable overlay debugging."), &overlaylist); 3728 add_cmd ("auto", class_support, overlay_auto_command, 3729 _("Enable automatic overlay debugging."), &overlaylist); 3730 add_cmd ("load-target", class_support, overlay_load_command, 3731 _("Read the overlay mapping state from the target."), &overlaylist); 3732 3733 /* Filename extension to source language lookup table: */ 3734 init_filename_language_table (); 3735 add_setshow_string_noescape_cmd ("extension-language", class_files, 3736 &ext_args, _("\ 3737 Set mapping between filename extension and source language."), _("\ 3738 Show mapping between filename extension and source language."), _("\ 3739 Usage: set extension-language .foo bar"), 3740 set_ext_lang_command, 3741 show_ext_args, 3742 &setlist, &showlist); 3743 3744 add_info ("extensions", info_ext_lang_command, 3745 _("All filename extensions associated with a source language.")); 3746 3747 add_setshow_optional_filename_cmd ("debug-file-directory", class_support, 3748 &debug_file_directory, _("\ 3749 Set the directories where separate debug symbols are searched for."), _("\ 3750 Show the directories where separate debug symbols are searched for."), _("\ 3751 Separate debug symbols are first searched for in the same\n\ 3752 directory as the binary, then in the `" DEBUG_SUBDIRECTORY "' subdirectory,\n\ 3753 and lastly at the path of the directory of the binary with\n\ 3754 each global debug-file-directory component prepended."), 3755 NULL, 3756 show_debug_file_directory, 3757 &setlist, &showlist); 3758 } 3759