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