symfile.c revision 1.8
1/* Generic symbol file reading for the GNU debugger, GDB. 2 3 Copyright (C) 1990-2019 Free Software Foundation, Inc. 4 5 Contributed by Cygnus Support, using pieces from other GDB modules. 6 7 This file is part of GDB. 8 9 This program is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License as published by 11 the Free Software Foundation; either version 3 of the License, or 12 (at your option) any later version. 13 14 This program is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 21 22#include "defs.h" 23#include "arch-utils.h" 24#include "bfdlink.h" 25#include "symtab.h" 26#include "gdbtypes.h" 27#include "gdbcore.h" 28#include "frame.h" 29#include "target.h" 30#include "value.h" 31#include "symfile.h" 32#include "objfiles.h" 33#include "source.h" 34#include "gdbcmd.h" 35#include "breakpoint.h" 36#include "language.h" 37#include "complaints.h" 38#include "demangle.h" 39#include "inferior.h" 40#include "regcache.h" 41#include "filenames.h" /* for DOSish file names */ 42#include "gdb-stabs.h" 43#include "gdb_obstack.h" 44#include "completer.h" 45#include "bcache.h" 46#include "hashtab.h" 47#include "readline/readline.h" 48#include "block.h" 49#include "observable.h" 50#include "exec.h" 51#include "parser-defs.h" 52#include "varobj.h" 53#include "elf-bfd.h" 54#include "solib.h" 55#include "remote.h" 56#include "stack.h" 57#include "gdb_bfd.h" 58#include "cli/cli-utils.h" 59#include "common/byte-vector.h" 60#include "common/pathstuff.h" 61#include "common/selftest.h" 62#include "cli/cli-style.h" 63#include "common/forward-scope-exit.h" 64 65#include <sys/types.h> 66#include <fcntl.h> 67#include <sys/stat.h> 68#include <ctype.h> 69#include <chrono> 70#include <algorithm> 71 72#include "psymtab.h" 73 74int (*deprecated_ui_load_progress_hook) (const char *section, 75 unsigned long num); 76void (*deprecated_show_load_progress) (const char *section, 77 unsigned long section_sent, 78 unsigned long section_size, 79 unsigned long total_sent, 80 unsigned long total_size); 81void (*deprecated_pre_add_symbol_hook) (const char *); 82void (*deprecated_post_add_symbol_hook) (void); 83 84using clear_symtab_users_cleanup 85 = FORWARD_SCOPE_EXIT (clear_symtab_users); 86 87/* Global variables owned by this file. */ 88int readnow_symbol_files; /* Read full symbols immediately. */ 89int readnever_symbol_files; /* Never read full symbols. */ 90 91/* Functions this file defines. */ 92 93static void symbol_file_add_main_1 (const char *args, symfile_add_flags add_flags, 94 objfile_flags flags, CORE_ADDR reloff); 95 96static const struct sym_fns *find_sym_fns (bfd *); 97 98static void overlay_invalidate_all (void); 99 100static void simple_free_overlay_table (void); 101 102static void read_target_long_array (CORE_ADDR, unsigned int *, int, int, 103 enum bfd_endian); 104 105static int simple_read_overlay_table (void); 106 107static int simple_overlay_update_1 (struct obj_section *); 108 109static void symfile_find_segment_sections (struct objfile *objfile); 110 111/* List of all available sym_fns. On gdb startup, each object file reader 112 calls add_symtab_fns() to register information on each format it is 113 prepared to read. */ 114 115struct registered_sym_fns 116{ 117 registered_sym_fns (bfd_flavour sym_flavour_, const struct sym_fns *sym_fns_) 118 : sym_flavour (sym_flavour_), sym_fns (sym_fns_) 119 {} 120 121 /* BFD flavour that we handle. */ 122 enum bfd_flavour sym_flavour; 123 124 /* The "vtable" of symbol functions. */ 125 const struct sym_fns *sym_fns; 126}; 127 128static std::vector<registered_sym_fns> symtab_fns; 129 130/* Values for "set print symbol-loading". */ 131 132const char print_symbol_loading_off[] = "off"; 133const char print_symbol_loading_brief[] = "brief"; 134const char print_symbol_loading_full[] = "full"; 135static const char *print_symbol_loading_enums[] = 136{ 137 print_symbol_loading_off, 138 print_symbol_loading_brief, 139 print_symbol_loading_full, 140 NULL 141}; 142static const char *print_symbol_loading = print_symbol_loading_full; 143 144/* If non-zero, shared library symbols will be added automatically 145 when the inferior is created, new libraries are loaded, or when 146 attaching to the inferior. This is almost always what users will 147 want to have happen; but for very large programs, the startup time 148 will be excessive, and so if this is a problem, the user can clear 149 this flag and then add the shared library symbols as needed. Note 150 that there is a potential for confusion, since if the shared 151 library symbols are not loaded, commands like "info fun" will *not* 152 report all the functions that are actually present. */ 153 154int auto_solib_add = 1; 155 156 157/* Return non-zero if symbol-loading messages should be printed. 158 FROM_TTY is the standard from_tty argument to gdb commands. 159 If EXEC is non-zero the messages are for the executable. 160 Otherwise, messages are for shared libraries. 161 If FULL is non-zero then the caller is printing a detailed message. 162 E.g., the message includes the shared library name. 163 Otherwise, the caller is printing a brief "summary" message. */ 164 165int 166print_symbol_loading_p (int from_tty, int exec, int full) 167{ 168 if (!from_tty && !info_verbose) 169 return 0; 170 171 if (exec) 172 { 173 /* We don't check FULL for executables, there are few such 174 messages, therefore brief == full. */ 175 return print_symbol_loading != print_symbol_loading_off; 176 } 177 if (full) 178 return print_symbol_loading == print_symbol_loading_full; 179 return print_symbol_loading == print_symbol_loading_brief; 180} 181 182/* True if we are reading a symbol table. */ 183 184int currently_reading_symtab = 0; 185 186/* Increment currently_reading_symtab and return a cleanup that can be 187 used to decrement it. */ 188 189scoped_restore_tmpl<int> 190increment_reading_symtab (void) 191{ 192 gdb_assert (currently_reading_symtab >= 0); 193 return make_scoped_restore (¤tly_reading_symtab, 194 currently_reading_symtab + 1); 195} 196 197/* Remember the lowest-addressed loadable section we've seen. 198 This function is called via bfd_map_over_sections. 199 200 In case of equal vmas, the section with the largest size becomes the 201 lowest-addressed loadable section. 202 203 If the vmas and sizes are equal, the last section is considered the 204 lowest-addressed loadable section. */ 205 206void 207find_lowest_section (bfd *abfd, asection *sect, void *obj) 208{ 209 asection **lowest = (asection **) obj; 210 211 if (0 == (bfd_get_section_flags (abfd, sect) & (SEC_ALLOC | SEC_LOAD))) 212 return; 213 if (!*lowest) 214 *lowest = sect; /* First loadable section */ 215 else if (bfd_section_vma (abfd, *lowest) > bfd_section_vma (abfd, sect)) 216 *lowest = sect; /* A lower loadable section */ 217 else if (bfd_section_vma (abfd, *lowest) == bfd_section_vma (abfd, sect) 218 && (bfd_section_size (abfd, (*lowest)) 219 <= bfd_section_size (abfd, sect))) 220 *lowest = sect; 221} 222 223/* Build (allocate and populate) a section_addr_info struct from 224 an existing section table. */ 225 226section_addr_info 227build_section_addr_info_from_section_table (const struct target_section *start, 228 const struct target_section *end) 229{ 230 const struct target_section *stp; 231 232 section_addr_info sap; 233 234 for (stp = start; stp != end; stp++) 235 { 236 struct bfd_section *asect = stp->the_bfd_section; 237 bfd *abfd = asect->owner; 238 239 if (bfd_get_section_flags (abfd, asect) & (SEC_ALLOC | SEC_LOAD) 240 && sap.size () < end - start) 241 sap.emplace_back (stp->addr, 242 bfd_section_name (abfd, asect), 243 gdb_bfd_section_index (abfd, asect)); 244 } 245 246 return sap; 247} 248 249/* Create a section_addr_info from section offsets in ABFD. */ 250 251static section_addr_info 252build_section_addr_info_from_bfd (bfd *abfd) 253{ 254 struct bfd_section *sec; 255 256 section_addr_info sap; 257 for (sec = abfd->sections; sec != NULL; sec = sec->next) 258 if (bfd_get_section_flags (abfd, sec) & (SEC_ALLOC | SEC_LOAD)) 259 sap.emplace_back (bfd_get_section_vma (abfd, sec), 260 bfd_get_section_name (abfd, sec), 261 gdb_bfd_section_index (abfd, sec)); 262 263 return sap; 264} 265 266/* Create a section_addr_info from section offsets in OBJFILE. */ 267 268section_addr_info 269build_section_addr_info_from_objfile (const struct objfile *objfile) 270{ 271 int i; 272 273 /* Before reread_symbols gets rewritten it is not safe to call: 274 gdb_assert (objfile->num_sections == bfd_count_sections (objfile->obfd)); 275 */ 276 section_addr_info sap = build_section_addr_info_from_bfd (objfile->obfd); 277 for (i = 0; i < sap.size (); i++) 278 { 279 int sectindex = sap[i].sectindex; 280 281 sap[i].addr += objfile->section_offsets->offsets[sectindex]; 282 } 283 return sap; 284} 285 286/* Initialize OBJFILE's sect_index_* members. */ 287 288static void 289init_objfile_sect_indices (struct objfile *objfile) 290{ 291 asection *sect; 292 int i; 293 294 sect = bfd_get_section_by_name (objfile->obfd, ".text"); 295 if (sect) 296 objfile->sect_index_text = sect->index; 297 298 sect = bfd_get_section_by_name (objfile->obfd, ".data"); 299 if (sect) 300 objfile->sect_index_data = sect->index; 301 302 sect = bfd_get_section_by_name (objfile->obfd, ".bss"); 303 if (sect) 304 objfile->sect_index_bss = sect->index; 305 306 sect = bfd_get_section_by_name (objfile->obfd, ".rodata"); 307 if (sect) 308 objfile->sect_index_rodata = sect->index; 309 310 /* This is where things get really weird... We MUST have valid 311 indices for the various sect_index_* members or gdb will abort. 312 So if for example, there is no ".text" section, we have to 313 accomodate that. First, check for a file with the standard 314 one or two segments. */ 315 316 symfile_find_segment_sections (objfile); 317 318 /* Except when explicitly adding symbol files at some address, 319 section_offsets contains nothing but zeros, so it doesn't matter 320 which slot in section_offsets the individual sect_index_* members 321 index into. So if they are all zero, it is safe to just point 322 all the currently uninitialized indices to the first slot. But 323 beware: if this is the main executable, it may be relocated 324 later, e.g. by the remote qOffsets packet, and then this will 325 be wrong! That's why we try segments first. */ 326 327 for (i = 0; i < objfile->num_sections; i++) 328 { 329 if (ANOFFSET (objfile->section_offsets, i) != 0) 330 { 331 break; 332 } 333 } 334 if (i == objfile->num_sections) 335 { 336 if (objfile->sect_index_text == -1) 337 objfile->sect_index_text = 0; 338 if (objfile->sect_index_data == -1) 339 objfile->sect_index_data = 0; 340 if (objfile->sect_index_bss == -1) 341 objfile->sect_index_bss = 0; 342 if (objfile->sect_index_rodata == -1) 343 objfile->sect_index_rodata = 0; 344 } 345} 346 347/* The arguments to place_section. */ 348 349struct place_section_arg 350{ 351 struct section_offsets *offsets; 352 CORE_ADDR lowest; 353}; 354 355/* Find a unique offset to use for loadable section SECT if 356 the user did not provide an offset. */ 357 358static void 359place_section (bfd *abfd, asection *sect, void *obj) 360{ 361 struct place_section_arg *arg = (struct place_section_arg *) obj; 362 CORE_ADDR *offsets = arg->offsets->offsets, start_addr; 363 int done; 364 ULONGEST align = ((ULONGEST) 1) << bfd_get_section_alignment (abfd, sect); 365 366 /* We are only interested in allocated sections. */ 367 if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0) 368 return; 369 370 /* If the user specified an offset, honor it. */ 371 if (offsets[gdb_bfd_section_index (abfd, sect)] != 0) 372 return; 373 374 /* Otherwise, let's try to find a place for the section. */ 375 start_addr = (arg->lowest + align - 1) & -align; 376 377 do { 378 asection *cur_sec; 379 380 done = 1; 381 382 for (cur_sec = abfd->sections; cur_sec != NULL; cur_sec = cur_sec->next) 383 { 384 int indx = cur_sec->index; 385 386 /* We don't need to compare against ourself. */ 387 if (cur_sec == sect) 388 continue; 389 390 /* We can only conflict with allocated sections. */ 391 if ((bfd_get_section_flags (abfd, cur_sec) & SEC_ALLOC) == 0) 392 continue; 393 394 /* If the section offset is 0, either the section has not been placed 395 yet, or it was the lowest section placed (in which case LOWEST 396 will be past its end). */ 397 if (offsets[indx] == 0) 398 continue; 399 400 /* If this section would overlap us, then we must move up. */ 401 if (start_addr + bfd_get_section_size (sect) > offsets[indx] 402 && start_addr < offsets[indx] + bfd_get_section_size (cur_sec)) 403 { 404 start_addr = offsets[indx] + bfd_get_section_size (cur_sec); 405 start_addr = (start_addr + align - 1) & -align; 406 done = 0; 407 break; 408 } 409 410 /* Otherwise, we appear to be OK. So far. */ 411 } 412 } 413 while (!done); 414 415 offsets[gdb_bfd_section_index (abfd, sect)] = start_addr; 416 arg->lowest = start_addr + bfd_get_section_size (sect); 417} 418 419/* Store section_addr_info as prepared (made relative and with SECTINDEX 420 filled-in) by addr_info_make_relative into SECTION_OFFSETS of NUM_SECTIONS 421 entries. */ 422 423void 424relative_addr_info_to_section_offsets (struct section_offsets *section_offsets, 425 int num_sections, 426 const section_addr_info &addrs) 427{ 428 int i; 429 430 memset (section_offsets, 0, SIZEOF_N_SECTION_OFFSETS (num_sections)); 431 432 /* Now calculate offsets for section that were specified by the caller. */ 433 for (i = 0; i < addrs.size (); i++) 434 { 435 const struct other_sections *osp; 436 437 osp = &addrs[i]; 438 if (osp->sectindex == -1) 439 continue; 440 441 /* Record all sections in offsets. */ 442 /* The section_offsets in the objfile are here filled in using 443 the BFD index. */ 444 section_offsets->offsets[osp->sectindex] = osp->addr; 445 } 446} 447 448/* Transform section name S for a name comparison. prelink can split section 449 `.bss' into two sections `.dynbss' and `.bss' (in this order). Similarly 450 prelink can split `.sbss' into `.sdynbss' and `.sbss'. Use virtual address 451 of the new `.dynbss' (`.sdynbss') section as the adjacent new `.bss' 452 (`.sbss') section has invalid (increased) virtual address. */ 453 454static const char * 455addr_section_name (const char *s) 456{ 457 if (strcmp (s, ".dynbss") == 0) 458 return ".bss"; 459 if (strcmp (s, ".sdynbss") == 0) 460 return ".sbss"; 461 462 return s; 463} 464 465/* std::sort comparator for addrs_section_sort. Sort entries in 466 ascending order by their (name, sectindex) pair. sectindex makes 467 the sort by name stable. */ 468 469static bool 470addrs_section_compar (const struct other_sections *a, 471 const struct other_sections *b) 472{ 473 int retval; 474 475 retval = strcmp (addr_section_name (a->name.c_str ()), 476 addr_section_name (b->name.c_str ())); 477 if (retval != 0) 478 return retval < 0; 479 480 return a->sectindex < b->sectindex; 481} 482 483/* Provide sorted array of pointers to sections of ADDRS. */ 484 485static std::vector<const struct other_sections *> 486addrs_section_sort (const section_addr_info &addrs) 487{ 488 int i; 489 490 std::vector<const struct other_sections *> array (addrs.size ()); 491 for (i = 0; i < addrs.size (); i++) 492 array[i] = &addrs[i]; 493 494 std::sort (array.begin (), array.end (), addrs_section_compar); 495 496 return array; 497} 498 499/* Relativize absolute addresses in ADDRS into offsets based on ABFD. Fill-in 500 also SECTINDEXes specific to ABFD there. This function can be used to 501 rebase ADDRS to start referencing different BFD than before. */ 502 503void 504addr_info_make_relative (section_addr_info *addrs, bfd *abfd) 505{ 506 asection *lower_sect; 507 CORE_ADDR lower_offset; 508 int i; 509 510 /* Find lowest loadable section to be used as starting point for 511 continguous sections. */ 512 lower_sect = NULL; 513 bfd_map_over_sections (abfd, find_lowest_section, &lower_sect); 514 if (lower_sect == NULL) 515 { 516 warning (_("no loadable sections found in added symbol-file %s"), 517 bfd_get_filename (abfd)); 518 lower_offset = 0; 519 } 520 else 521 lower_offset = bfd_section_vma (bfd_get_filename (abfd), lower_sect); 522 523 /* Create ADDRS_TO_ABFD_ADDRS array to map the sections in ADDRS to sections 524 in ABFD. Section names are not unique - there can be multiple sections of 525 the same name. Also the sections of the same name do not have to be 526 adjacent to each other. Some sections may be present only in one of the 527 files. Even sections present in both files do not have to be in the same 528 order. 529 530 Use stable sort by name for the sections in both files. Then linearly 531 scan both lists matching as most of the entries as possible. */ 532 533 std::vector<const struct other_sections *> addrs_sorted 534 = addrs_section_sort (*addrs); 535 536 section_addr_info abfd_addrs = build_section_addr_info_from_bfd (abfd); 537 std::vector<const struct other_sections *> abfd_addrs_sorted 538 = addrs_section_sort (abfd_addrs); 539 540 /* Now create ADDRS_TO_ABFD_ADDRS from ADDRS_SORTED and 541 ABFD_ADDRS_SORTED. */ 542 543 std::vector<const struct other_sections *> 544 addrs_to_abfd_addrs (addrs->size (), nullptr); 545 546 std::vector<const struct other_sections *>::iterator abfd_sorted_iter 547 = abfd_addrs_sorted.begin (); 548 for (const other_sections *sect : addrs_sorted) 549 { 550 const char *sect_name = addr_section_name (sect->name.c_str ()); 551 552 while (abfd_sorted_iter != abfd_addrs_sorted.end () 553 && strcmp (addr_section_name ((*abfd_sorted_iter)->name.c_str ()), 554 sect_name) < 0) 555 abfd_sorted_iter++; 556 557 if (abfd_sorted_iter != abfd_addrs_sorted.end () 558 && strcmp (addr_section_name ((*abfd_sorted_iter)->name.c_str ()), 559 sect_name) == 0) 560 { 561 int index_in_addrs; 562 563 /* Make the found item directly addressable from ADDRS. */ 564 index_in_addrs = sect - addrs->data (); 565 gdb_assert (addrs_to_abfd_addrs[index_in_addrs] == NULL); 566 addrs_to_abfd_addrs[index_in_addrs] = *abfd_sorted_iter; 567 568 /* Never use the same ABFD entry twice. */ 569 abfd_sorted_iter++; 570 } 571 } 572 573 /* Calculate offsets for the loadable sections. 574 FIXME! Sections must be in order of increasing loadable section 575 so that contiguous sections can use the lower-offset!!! 576 577 Adjust offsets if the segments are not contiguous. 578 If the section is contiguous, its offset should be set to 579 the offset of the highest loadable section lower than it 580 (the loadable section directly below it in memory). 581 this_offset = lower_offset = lower_addr - lower_orig_addr */ 582 583 for (i = 0; i < addrs->size (); i++) 584 { 585 const struct other_sections *sect = addrs_to_abfd_addrs[i]; 586 587 if (sect) 588 { 589 /* This is the index used by BFD. */ 590 (*addrs)[i].sectindex = sect->sectindex; 591 592 if ((*addrs)[i].addr != 0) 593 { 594 (*addrs)[i].addr -= sect->addr; 595 lower_offset = (*addrs)[i].addr; 596 } 597 else 598 (*addrs)[i].addr = lower_offset; 599 } 600 else 601 { 602 /* addr_section_name transformation is not used for SECT_NAME. */ 603 const std::string §_name = (*addrs)[i].name; 604 605 /* This section does not exist in ABFD, which is normally 606 unexpected and we want to issue a warning. 607 608 However, the ELF prelinker does create a few sections which are 609 marked in the main executable as loadable (they are loaded in 610 memory from the DYNAMIC segment) and yet are not present in 611 separate debug info files. This is fine, and should not cause 612 a warning. Shared libraries contain just the section 613 ".gnu.liblist" but it is not marked as loadable there. There is 614 no other way to identify them than by their name as the sections 615 created by prelink have no special flags. 616 617 For the sections `.bss' and `.sbss' see addr_section_name. */ 618 619 if (!(sect_name == ".gnu.liblist" 620 || sect_name == ".gnu.conflict" 621 || (sect_name == ".bss" 622 && i > 0 623 && (*addrs)[i - 1].name == ".dynbss" 624 && addrs_to_abfd_addrs[i - 1] != NULL) 625 || (sect_name == ".sbss" 626 && i > 0 627 && (*addrs)[i - 1].name == ".sdynbss" 628 && addrs_to_abfd_addrs[i - 1] != NULL))) 629 warning (_("section %s not found in %s"), sect_name.c_str (), 630 bfd_get_filename (abfd)); 631 632 (*addrs)[i].addr = 0; 633 (*addrs)[i].sectindex = -1; 634 } 635 } 636} 637 638/* Parse the user's idea of an offset for dynamic linking, into our idea 639 of how to represent it for fast symbol reading. This is the default 640 version of the sym_fns.sym_offsets function for symbol readers that 641 don't need to do anything special. It allocates a section_offsets table 642 for the objectfile OBJFILE and stuffs ADDR into all of the offsets. */ 643 644void 645default_symfile_offsets (struct objfile *objfile, 646 const section_addr_info &addrs) 647{ 648 objfile->num_sections = gdb_bfd_count_sections (objfile->obfd); 649 objfile->section_offsets = (struct section_offsets *) 650 obstack_alloc (&objfile->objfile_obstack, 651 SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)); 652 relative_addr_info_to_section_offsets (objfile->section_offsets, 653 objfile->num_sections, addrs); 654 655 /* For relocatable files, all loadable sections will start at zero. 656 The zero is meaningless, so try to pick arbitrary addresses such 657 that no loadable sections overlap. This algorithm is quadratic, 658 but the number of sections in a single object file is generally 659 small. */ 660 if ((bfd_get_file_flags (objfile->obfd) & (EXEC_P | DYNAMIC)) == 0) 661 { 662 struct place_section_arg arg; 663 bfd *abfd = objfile->obfd; 664 asection *cur_sec; 665 666 for (cur_sec = abfd->sections; cur_sec != NULL; cur_sec = cur_sec->next) 667 /* We do not expect this to happen; just skip this step if the 668 relocatable file has a section with an assigned VMA. */ 669 if (bfd_section_vma (abfd, cur_sec) != 0) 670 break; 671 672 if (cur_sec == NULL) 673 { 674 CORE_ADDR *offsets = objfile->section_offsets->offsets; 675 676 /* Pick non-overlapping offsets for sections the user did not 677 place explicitly. */ 678 arg.offsets = objfile->section_offsets; 679 arg.lowest = 0; 680 bfd_map_over_sections (objfile->obfd, place_section, &arg); 681 682 /* Correctly filling in the section offsets is not quite 683 enough. Relocatable files have two properties that 684 (most) shared objects do not: 685 686 - Their debug information will contain relocations. Some 687 shared libraries do also, but many do not, so this can not 688 be assumed. 689 690 - If there are multiple code sections they will be loaded 691 at different relative addresses in memory than they are 692 in the objfile, since all sections in the file will start 693 at address zero. 694 695 Because GDB has very limited ability to map from an 696 address in debug info to the correct code section, 697 it relies on adding SECT_OFF_TEXT to things which might be 698 code. If we clear all the section offsets, and set the 699 section VMAs instead, then symfile_relocate_debug_section 700 will return meaningful debug information pointing at the 701 correct sections. 702 703 GDB has too many different data structures for section 704 addresses - a bfd, objfile, and so_list all have section 705 tables, as does exec_ops. Some of these could probably 706 be eliminated. */ 707 708 for (cur_sec = abfd->sections; cur_sec != NULL; 709 cur_sec = cur_sec->next) 710 { 711 if ((bfd_get_section_flags (abfd, cur_sec) & SEC_ALLOC) == 0) 712 continue; 713 714 bfd_set_section_vma (abfd, cur_sec, offsets[cur_sec->index]); 715 exec_set_section_address (bfd_get_filename (abfd), 716 cur_sec->index, 717 offsets[cur_sec->index]); 718 offsets[cur_sec->index] = 0; 719 } 720 } 721 } 722 723 /* Remember the bfd indexes for the .text, .data, .bss and 724 .rodata sections. */ 725 init_objfile_sect_indices (objfile); 726} 727 728/* Divide the file into segments, which are individual relocatable units. 729 This is the default version of the sym_fns.sym_segments function for 730 symbol readers that do not have an explicit representation of segments. 731 It assumes that object files do not have segments, and fully linked 732 files have a single segment. */ 733 734struct symfile_segment_data * 735default_symfile_segments (bfd *abfd) 736{ 737 int num_sections, i; 738 asection *sect; 739 struct symfile_segment_data *data; 740 CORE_ADDR low, high; 741 742 /* Relocatable files contain enough information to position each 743 loadable section independently; they should not be relocated 744 in segments. */ 745 if ((bfd_get_file_flags (abfd) & (EXEC_P | DYNAMIC)) == 0) 746 return NULL; 747 748 /* Make sure there is at least one loadable section in the file. */ 749 for (sect = abfd->sections; sect != NULL; sect = sect->next) 750 { 751 if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0) 752 continue; 753 754 break; 755 } 756 if (sect == NULL) 757 return NULL; 758 759 low = bfd_get_section_vma (abfd, sect); 760 high = low + bfd_get_section_size (sect); 761 762 data = XCNEW (struct symfile_segment_data); 763 data->num_segments = 1; 764 data->segment_bases = XCNEW (CORE_ADDR); 765 data->segment_sizes = XCNEW (CORE_ADDR); 766 767 num_sections = bfd_count_sections (abfd); 768 data->segment_info = XCNEWVEC (int, num_sections); 769 770 for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next) 771 { 772 CORE_ADDR vma; 773 774 if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0) 775 continue; 776 777 vma = bfd_get_section_vma (abfd, sect); 778 if (vma < low) 779 low = vma; 780 if (vma + bfd_get_section_size (sect) > high) 781 high = vma + bfd_get_section_size (sect); 782 783 data->segment_info[i] = 1; 784 } 785 786 data->segment_bases[0] = low; 787 data->segment_sizes[0] = high - low; 788 789 return data; 790} 791 792/* This is a convenience function to call sym_read for OBJFILE and 793 possibly force the partial symbols to be read. */ 794 795static void 796read_symbols (struct objfile *objfile, symfile_add_flags add_flags) 797{ 798 (*objfile->sf->sym_read) (objfile, add_flags); 799 objfile->per_bfd->minsyms_read = true; 800 801 /* find_separate_debug_file_in_section should be called only if there is 802 single binary with no existing separate debug info file. */ 803 if (!objfile_has_partial_symbols (objfile) 804 && objfile->separate_debug_objfile == NULL 805 && objfile->separate_debug_objfile_backlink == NULL) 806 { 807 gdb_bfd_ref_ptr abfd (find_separate_debug_file_in_section (objfile)); 808 809 if (abfd != NULL) 810 { 811 /* find_separate_debug_file_in_section uses the same filename for the 812 virtual section-as-bfd like the bfd filename containing the 813 section. Therefore use also non-canonical name form for the same 814 file containing the section. */ 815 symbol_file_add_separate (abfd.get (), 816 bfd_get_filename (abfd.get ()), 817 add_flags | SYMFILE_NOT_FILENAME, objfile); 818 } 819 } 820 if ((add_flags & SYMFILE_NO_READ) == 0) 821 require_partial_symbols (objfile, 0); 822} 823 824/* Initialize entry point information for this objfile. */ 825 826static void 827init_entry_point_info (struct objfile *objfile) 828{ 829 struct entry_info *ei = &objfile->per_bfd->ei; 830 831 if (ei->initialized) 832 return; 833 ei->initialized = 1; 834 835 /* Save startup file's range of PC addresses to help blockframe.c 836 decide where the bottom of the stack is. */ 837 838 if (bfd_get_file_flags (objfile->obfd) & EXEC_P) 839 { 840 /* Executable file -- record its entry point so we'll recognize 841 the startup file because it contains the entry point. */ 842 ei->entry_point = bfd_get_start_address (objfile->obfd); 843 ei->entry_point_p = 1; 844 } 845 else if (bfd_get_file_flags (objfile->obfd) & DYNAMIC 846 && bfd_get_start_address (objfile->obfd) != 0) 847 { 848 /* Some shared libraries may have entry points set and be 849 runnable. There's no clear way to indicate this, so just check 850 for values other than zero. */ 851 ei->entry_point = bfd_get_start_address (objfile->obfd); 852 ei->entry_point_p = 1; 853 } 854 else 855 { 856 /* Examination of non-executable.o files. Short-circuit this stuff. */ 857 ei->entry_point_p = 0; 858 } 859 860 if (ei->entry_point_p) 861 { 862 struct obj_section *osect; 863 CORE_ADDR entry_point = ei->entry_point; 864 int found; 865 866 /* Make certain that the address points at real code, and not a 867 function descriptor. */ 868 entry_point 869 = gdbarch_convert_from_func_ptr_addr (get_objfile_arch (objfile), 870 entry_point, 871 current_top_target ()); 872 873 /* Remove any ISA markers, so that this matches entries in the 874 symbol table. */ 875 ei->entry_point 876 = gdbarch_addr_bits_remove (get_objfile_arch (objfile), entry_point); 877 878 found = 0; 879 ALL_OBJFILE_OSECTIONS (objfile, osect) 880 { 881 struct bfd_section *sect = osect->the_bfd_section; 882 883 if (entry_point >= bfd_get_section_vma (objfile->obfd, sect) 884 && entry_point < (bfd_get_section_vma (objfile->obfd, sect) 885 + bfd_get_section_size (sect))) 886 { 887 ei->the_bfd_section_index 888 = gdb_bfd_section_index (objfile->obfd, sect); 889 found = 1; 890 break; 891 } 892 } 893 894 if (!found) 895 ei->the_bfd_section_index = SECT_OFF_TEXT (objfile); 896 } 897} 898 899/* Process a symbol file, as either the main file or as a dynamically 900 loaded file. 901 902 This function does not set the OBJFILE's entry-point info. 903 904 OBJFILE is where the symbols are to be read from. 905 906 ADDRS is the list of section load addresses. If the user has given 907 an 'add-symbol-file' command, then this is the list of offsets and 908 addresses he or she provided as arguments to the command; or, if 909 we're handling a shared library, these are the actual addresses the 910 sections are loaded at, according to the inferior's dynamic linker 911 (as gleaned by GDB's shared library code). We convert each address 912 into an offset from the section VMA's as it appears in the object 913 file, and then call the file's sym_offsets function to convert this 914 into a format-specific offset table --- a `struct section_offsets'. 915 The sectindex field is used to control the ordering of sections 916 with the same name. Upon return, it is updated to contain the 917 correspondig BFD section index, or -1 if the section was not found. 918 919 ADD_FLAGS encodes verbosity level, whether this is main symbol or 920 an extra symbol file such as dynamically loaded code, and wether 921 breakpoint reset should be deferred. */ 922 923static void 924syms_from_objfile_1 (struct objfile *objfile, 925 section_addr_info *addrs, 926 symfile_add_flags add_flags) 927{ 928 section_addr_info local_addr; 929 const int mainline = add_flags & SYMFILE_MAINLINE; 930 931 objfile_set_sym_fns (objfile, find_sym_fns (objfile->obfd)); 932 933 if (objfile->sf == NULL) 934 { 935 /* No symbols to load, but we still need to make sure 936 that the section_offsets table is allocated. */ 937 int num_sections = gdb_bfd_count_sections (objfile->obfd); 938 size_t size = SIZEOF_N_SECTION_OFFSETS (num_sections); 939 940 objfile->num_sections = num_sections; 941 objfile->section_offsets 942 = (struct section_offsets *) obstack_alloc (&objfile->objfile_obstack, 943 size); 944 memset (objfile->section_offsets, 0, size); 945 return; 946 } 947 948 /* Make sure that partially constructed symbol tables will be cleaned up 949 if an error occurs during symbol reading. */ 950 gdb::optional<clear_symtab_users_cleanup> defer_clear_users; 951 952 std::unique_ptr<struct objfile> objfile_holder (objfile); 953 954 /* If ADDRS is NULL, put together a dummy address list. 955 We now establish the convention that an addr of zero means 956 no load address was specified. */ 957 if (! addrs) 958 addrs = &local_addr; 959 960 if (mainline) 961 { 962 /* We will modify the main symbol table, make sure that all its users 963 will be cleaned up if an error occurs during symbol reading. */ 964 defer_clear_users.emplace ((symfile_add_flag) 0); 965 966 /* Since no error yet, throw away the old symbol table. */ 967 968 if (symfile_objfile != NULL) 969 { 970 delete symfile_objfile; 971 gdb_assert (symfile_objfile == NULL); 972 } 973 974 /* Currently we keep symbols from the add-symbol-file command. 975 If the user wants to get rid of them, they should do "symbol-file" 976 without arguments first. Not sure this is the best behavior 977 (PR 2207). */ 978 979 (*objfile->sf->sym_new_init) (objfile); 980 } 981 982 /* Convert addr into an offset rather than an absolute address. 983 We find the lowest address of a loaded segment in the objfile, 984 and assume that <addr> is where that got loaded. 985 986 We no longer warn if the lowest section is not a text segment (as 987 happens for the PA64 port. */ 988 if (addrs->size () > 0) 989 addr_info_make_relative (addrs, objfile->obfd); 990 991 /* Initialize symbol reading routines for this objfile, allow complaints to 992 appear for this new file, and record how verbose to be, then do the 993 initial symbol reading for this file. */ 994 995 (*objfile->sf->sym_init) (objfile); 996 clear_complaints (); 997 998 (*objfile->sf->sym_offsets) (objfile, *addrs); 999 1000 read_symbols (objfile, add_flags); 1001 1002 /* Discard cleanups as symbol reading was successful. */ 1003 1004 objfile_holder.release (); 1005 if (defer_clear_users) 1006 defer_clear_users->release (); 1007} 1008 1009/* Same as syms_from_objfile_1, but also initializes the objfile 1010 entry-point info. */ 1011 1012static void 1013syms_from_objfile (struct objfile *objfile, 1014 section_addr_info *addrs, 1015 symfile_add_flags add_flags) 1016{ 1017 syms_from_objfile_1 (objfile, addrs, add_flags); 1018 init_entry_point_info (objfile); 1019} 1020 1021/* Perform required actions after either reading in the initial 1022 symbols for a new objfile, or mapping in the symbols from a reusable 1023 objfile. ADD_FLAGS is a bitmask of enum symfile_add_flags. */ 1024 1025static void 1026finish_new_objfile (struct objfile *objfile, symfile_add_flags add_flags) 1027{ 1028 /* If this is the main symbol file we have to clean up all users of the 1029 old main symbol file. Otherwise it is sufficient to fixup all the 1030 breakpoints that may have been redefined by this symbol file. */ 1031 if (add_flags & SYMFILE_MAINLINE) 1032 { 1033 /* OK, make it the "real" symbol file. */ 1034 symfile_objfile = objfile; 1035 1036 clear_symtab_users (add_flags); 1037 } 1038 else if ((add_flags & SYMFILE_DEFER_BP_RESET) == 0) 1039 { 1040 breakpoint_re_set (); 1041 } 1042 1043 /* We're done reading the symbol file; finish off complaints. */ 1044 clear_complaints (); 1045} 1046 1047/* Process a symbol file, as either the main file or as a dynamically 1048 loaded file. 1049 1050 ABFD is a BFD already open on the file, as from symfile_bfd_open. 1051 A new reference is acquired by this function. 1052 1053 For NAME description see the objfile constructor. 1054 1055 ADD_FLAGS encodes verbosity, whether this is main symbol file or 1056 extra, such as dynamically loaded code, and what to do with breakpoins. 1057 1058 ADDRS is as described for syms_from_objfile_1, above. 1059 ADDRS is ignored when SYMFILE_MAINLINE bit is set in ADD_FLAGS. 1060 1061 PARENT is the original objfile if ABFD is a separate debug info file. 1062 Otherwise PARENT is NULL. 1063 1064 Upon success, returns a pointer to the objfile that was added. 1065 Upon failure, jumps back to command level (never returns). */ 1066 1067static struct objfile * 1068symbol_file_add_with_addrs (bfd *abfd, const char *name, 1069 symfile_add_flags add_flags, 1070 section_addr_info *addrs, 1071 objfile_flags flags, struct objfile *parent) 1072{ 1073 struct objfile *objfile; 1074 const int from_tty = add_flags & SYMFILE_VERBOSE; 1075 const int mainline = add_flags & SYMFILE_MAINLINE; 1076 const int should_print = (print_symbol_loading_p (from_tty, mainline, 1) 1077 && (readnow_symbol_files 1078 || (add_flags & SYMFILE_NO_READ) == 0)); 1079 1080 if (readnow_symbol_files) 1081 { 1082 flags |= OBJF_READNOW; 1083 add_flags &= ~SYMFILE_NO_READ; 1084 } 1085 else if (readnever_symbol_files 1086 || (parent != NULL && (parent->flags & OBJF_READNEVER))) 1087 { 1088 flags |= OBJF_READNEVER; 1089 add_flags |= SYMFILE_NO_READ; 1090 } 1091 if ((add_flags & SYMFILE_NOT_FILENAME) != 0) 1092 flags |= OBJF_NOT_FILENAME; 1093 1094 /* Give user a chance to burp if we'd be 1095 interactively wiping out any existing symbols. */ 1096 1097 if ((have_full_symbols () || have_partial_symbols ()) 1098 && mainline 1099 && from_tty 1100 && !query (_("Load new symbol table from \"%s\"? "), name)) 1101 error (_("Not confirmed.")); 1102 1103 if (mainline) 1104 flags |= OBJF_MAINLINE; 1105 objfile = new struct objfile (abfd, name, flags); 1106 1107 if (parent) 1108 add_separate_debug_objfile (objfile, parent); 1109 1110 /* We either created a new mapped symbol table, mapped an existing 1111 symbol table file which has not had initial symbol reading 1112 performed, or need to read an unmapped symbol table. */ 1113 if (should_print) 1114 { 1115 if (deprecated_pre_add_symbol_hook) 1116 deprecated_pre_add_symbol_hook (name); 1117 else 1118 { 1119 puts_filtered (_("Reading symbols from ")); 1120 fputs_styled (name, file_name_style.style (), gdb_stdout); 1121 puts_filtered ("...\n"); 1122 } 1123 } 1124 syms_from_objfile (objfile, addrs, 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 printf_filtered (_("Expanding full symbols from %s...\n"), name); 1135 1136 if (objfile->sf) 1137 objfile->sf->qf->expand_all_symtabs (objfile); 1138 } 1139 1140 /* Note that we only print a message if we have no symbols and have 1141 no separate debug file. If there is a separate debug file which 1142 does not have symbols, we'll have emitted this message for that 1143 file, and so printing it twice is just redundant. */ 1144 if (should_print && !objfile_has_symbols (objfile) 1145 && objfile->separate_debug_objfile == nullptr) 1146 printf_filtered (_("(No debugging symbols found in %s)\n"), name); 1147 1148 if (should_print) 1149 { 1150 if (deprecated_post_add_symbol_hook) 1151 deprecated_post_add_symbol_hook (); 1152 } 1153 1154 /* We print some messages regardless of whether 'from_tty || 1155 info_verbose' is true, so make sure they go out at the right 1156 time. */ 1157 gdb_flush (gdb_stdout); 1158 1159 if (objfile->sf == NULL) 1160 { 1161 gdb::observers::new_objfile.notify (objfile); 1162 return objfile; /* No symbols. */ 1163 } 1164 1165 finish_new_objfile (objfile, add_flags); 1166 1167 gdb::observers::new_objfile.notify (objfile); 1168 1169 bfd_cache_close_all (); 1170 return (objfile); 1171} 1172 1173/* Add BFD as a separate debug file for OBJFILE. For NAME description 1174 see the objfile constructor. */ 1175 1176void 1177symbol_file_add_separate (bfd *bfd, const char *name, 1178 symfile_add_flags symfile_flags, 1179 struct objfile *objfile) 1180{ 1181 /* Create section_addr_info. We can't directly use offsets from OBJFILE 1182 because sections of BFD may not match sections of OBJFILE and because 1183 vma may have been modified by tools such as prelink. */ 1184 section_addr_info sap = build_section_addr_info_from_objfile (objfile); 1185 1186 symbol_file_add_with_addrs 1187 (bfd, name, symfile_flags, &sap, 1188 objfile->flags & (OBJF_REORDERED | OBJF_SHARED | OBJF_READNOW 1189 | OBJF_USERLOADED), 1190 objfile); 1191} 1192 1193/* Process the symbol file ABFD, as either the main file or as a 1194 dynamically loaded file. 1195 See symbol_file_add_with_addrs's comments for details. */ 1196 1197struct objfile * 1198symbol_file_add_from_bfd (bfd *abfd, const char *name, 1199 symfile_add_flags add_flags, 1200 section_addr_info *addrs, 1201 objfile_flags flags, struct objfile *parent) 1202{ 1203 return symbol_file_add_with_addrs (abfd, name, add_flags, addrs, flags, 1204 parent); 1205} 1206 1207/* Process a symbol file, as either the main file or as a dynamically 1208 loaded file. See symbol_file_add_with_addrs's comments for details. */ 1209 1210struct objfile * 1211symbol_file_add (const char *name, symfile_add_flags add_flags, 1212 section_addr_info *addrs, objfile_flags flags) 1213{ 1214 gdb_bfd_ref_ptr bfd (symfile_bfd_open (name)); 1215 1216 return symbol_file_add_from_bfd (bfd.get (), name, add_flags, addrs, 1217 flags, NULL); 1218} 1219 1220/* Call symbol_file_add() with default values and update whatever is 1221 affected by the loading of a new main(). 1222 Used when the file is supplied in the gdb command line 1223 and by some targets with special loading requirements. 1224 The auxiliary function, symbol_file_add_main_1(), has the flags 1225 argument for the switches that can only be specified in the symbol_file 1226 command itself. */ 1227 1228void 1229symbol_file_add_main (const char *args, symfile_add_flags add_flags) 1230{ 1231 symbol_file_add_main_1 (args, add_flags, 0, 0); 1232} 1233 1234static void 1235symbol_file_add_main_1 (const char *args, symfile_add_flags add_flags, 1236 objfile_flags flags, CORE_ADDR reloff) 1237{ 1238 add_flags |= current_inferior ()->symfile_flags | SYMFILE_MAINLINE; 1239 1240 struct objfile *objfile = symbol_file_add (args, add_flags, NULL, flags); 1241 if (reloff != 0) 1242 objfile_rebase (objfile, reloff); 1243 1244 /* Getting new symbols may change our opinion about 1245 what is frameless. */ 1246 reinit_frame_cache (); 1247 1248 if ((add_flags & SYMFILE_NO_READ) == 0) 1249 set_initial_language (); 1250} 1251 1252void 1253symbol_file_clear (int from_tty) 1254{ 1255 if ((have_full_symbols () || have_partial_symbols ()) 1256 && from_tty 1257 && (symfile_objfile 1258 ? !query (_("Discard symbol table from `%s'? "), 1259 objfile_name (symfile_objfile)) 1260 : !query (_("Discard symbol table? ")))) 1261 error (_("Not confirmed.")); 1262 1263 /* solib descriptors may have handles to objfiles. Wipe them before their 1264 objfiles get stale by free_all_objfiles. */ 1265 no_shared_libraries (NULL, from_tty); 1266 1267 free_all_objfiles (); 1268 1269 gdb_assert (symfile_objfile == NULL); 1270 if (from_tty) 1271 printf_filtered (_("No symbol file now.\n")); 1272} 1273 1274/* See symfile.h. */ 1275 1276int separate_debug_file_debug = 0; 1277 1278static int 1279separate_debug_file_exists (const std::string &name, unsigned long crc, 1280 struct objfile *parent_objfile) 1281{ 1282 unsigned long file_crc; 1283 int file_crc_p; 1284 struct stat parent_stat, abfd_stat; 1285 int verified_as_different; 1286 1287 /* Find a separate debug info file as if symbols would be present in 1288 PARENT_OBJFILE itself this function would not be called. .gnu_debuglink 1289 section can contain just the basename of PARENT_OBJFILE without any 1290 ".debug" suffix as "/usr/lib/debug/path/to/file" is a separate tree where 1291 the separate debug infos with the same basename can exist. */ 1292 1293 if (filename_cmp (name.c_str (), objfile_name (parent_objfile)) == 0) 1294 return 0; 1295 1296 if (separate_debug_file_debug) 1297 { 1298 printf_filtered (_(" Trying %s..."), name.c_str ()); 1299 gdb_flush (gdb_stdout); 1300 } 1301 1302 gdb_bfd_ref_ptr abfd (gdb_bfd_open (name.c_str (), gnutarget, -1)); 1303 1304 if (abfd == NULL) 1305 { 1306 if (separate_debug_file_debug) 1307 printf_filtered (_(" no, unable to open.\n")); 1308 1309 return 0; 1310 } 1311 1312 /* Verify symlinks were not the cause of filename_cmp name difference above. 1313 1314 Some operating systems, e.g. Windows, do not provide a meaningful 1315 st_ino; they always set it to zero. (Windows does provide a 1316 meaningful st_dev.) Files accessed from gdbservers that do not 1317 support the vFile:fstat packet will also have st_ino set to zero. 1318 Do not indicate a duplicate library in either case. While there 1319 is no guarantee that a system that provides meaningful inode 1320 numbers will never set st_ino to zero, this is merely an 1321 optimization, so we do not need to worry about false negatives. */ 1322 1323 if (bfd_stat (abfd.get (), &abfd_stat) == 0 1324 && abfd_stat.st_ino != 0 1325 && bfd_stat (parent_objfile->obfd, &parent_stat) == 0) 1326 { 1327 if (abfd_stat.st_dev == parent_stat.st_dev 1328 && abfd_stat.st_ino == parent_stat.st_ino) 1329 { 1330 if (separate_debug_file_debug) 1331 printf_filtered (_(" no, same file as the objfile.\n")); 1332 1333 return 0; 1334 } 1335 verified_as_different = 1; 1336 } 1337 else 1338 verified_as_different = 0; 1339 1340 file_crc_p = gdb_bfd_crc (abfd.get (), &file_crc); 1341 1342 if (!file_crc_p) 1343 { 1344 if (separate_debug_file_debug) 1345 printf_filtered (_(" no, error computing CRC.\n")); 1346 1347 return 0; 1348 } 1349 1350 if (crc != file_crc) 1351 { 1352 unsigned long parent_crc; 1353 1354 /* If the files could not be verified as different with 1355 bfd_stat then we need to calculate the parent's CRC 1356 to verify whether the files are different or not. */ 1357 1358 if (!verified_as_different) 1359 { 1360 if (!gdb_bfd_crc (parent_objfile->obfd, &parent_crc)) 1361 { 1362 if (separate_debug_file_debug) 1363 printf_filtered (_(" no, error computing CRC.\n")); 1364 1365 return 0; 1366 } 1367 } 1368 1369 if (verified_as_different || parent_crc != file_crc) 1370 warning (_("the debug information found in \"%s\"" 1371 " does not match \"%s\" (CRC mismatch).\n"), 1372 name.c_str (), objfile_name (parent_objfile)); 1373 1374 if (separate_debug_file_debug) 1375 printf_filtered (_(" no, CRC doesn't match.\n")); 1376 1377 return 0; 1378 } 1379 1380 if (separate_debug_file_debug) 1381 printf_filtered (_(" yes!\n")); 1382 1383 return 1; 1384} 1385 1386char *debug_file_directory = NULL; 1387static void 1388show_debug_file_directory (struct ui_file *file, int from_tty, 1389 struct cmd_list_element *c, const char *value) 1390{ 1391 fprintf_filtered (file, 1392 _("The directory where separate debug " 1393 "symbols are searched for is \"%s\".\n"), 1394 value); 1395} 1396 1397#if ! defined (DEBUG_SUBDIRECTORY) 1398#define DEBUG_SUBDIRECTORY ".debug" 1399#endif 1400 1401/* Find a separate debuginfo file for OBJFILE, using DIR as the directory 1402 where the original file resides (may not be the same as 1403 dirname(objfile->name) due to symlinks), and DEBUGLINK as the file we are 1404 looking for. CANON_DIR is the "realpath" form of DIR. 1405 DIR must contain a trailing '/'. 1406 Returns the path of the file with separate debug info, or an empty 1407 string. */ 1408 1409static std::string 1410find_separate_debug_file (const char *dir, 1411 const char *canon_dir, 1412 const char *debuglink, 1413 unsigned long crc32, struct objfile *objfile) 1414{ 1415 if (separate_debug_file_debug) 1416 printf_filtered (_("\nLooking for separate debug info (debug link) for " 1417 "%s\n"), objfile_name (objfile)); 1418 1419 /* First try in the same directory as the original file. */ 1420 std::string debugfile = dir; 1421 debugfile += debuglink; 1422 1423 if (separate_debug_file_exists (debugfile, crc32, objfile)) 1424 return debugfile; 1425 1426 /* Then try in the subdirectory named DEBUG_SUBDIRECTORY. */ 1427 debugfile = dir; 1428 debugfile += DEBUG_SUBDIRECTORY; 1429 debugfile += "/"; 1430 debugfile += debuglink; 1431 1432 if (separate_debug_file_exists (debugfile, crc32, objfile)) 1433 return debugfile; 1434 1435 /* Then try in the global debugfile directories. 1436 1437 Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will 1438 cause "/..." lookups. */ 1439 1440 bool target_prefix = startswith (dir, "target:"); 1441 const char *dir_notarget = target_prefix ? dir + strlen ("target:") : dir; 1442 std::vector<gdb::unique_xmalloc_ptr<char>> debugdir_vec 1443 = dirnames_to_char_ptr_vec (debug_file_directory); 1444 gdb::unique_xmalloc_ptr<char> canon_sysroot = gdb_realpath (gdb_sysroot); 1445 1446 /* MS-Windows/MS-DOS don't allow colons in file names; we must 1447 convert the drive letter into a one-letter directory, so that the 1448 file name resulting from splicing below will be valid. 1449 1450 FIXME: The below only works when GDB runs on MS-Windows/MS-DOS. 1451 There are various remote-debugging scenarios where such a 1452 transformation of the drive letter might be required when GDB runs 1453 on a Posix host, see 1454 1455 https://sourceware.org/ml/gdb-patches/2019-04/msg00605.html 1456 1457 If some of those scenarions need to be supported, we will need to 1458 use a different condition for HAS_DRIVE_SPEC and a different macro 1459 instead of STRIP_DRIVE_SPEC, which work on Posix systems as well. */ 1460 std::string drive; 1461 if (HAS_DRIVE_SPEC (dir_notarget)) 1462 { 1463 drive = dir_notarget[0]; 1464 dir_notarget = STRIP_DRIVE_SPEC (dir_notarget); 1465 } 1466 1467 for (const gdb::unique_xmalloc_ptr<char> &debugdir : debugdir_vec) 1468 { 1469 debugfile = target_prefix ? "target:" : ""; 1470 debugfile += debugdir.get (); 1471 debugfile += "/"; 1472 debugfile += drive; 1473 debugfile += dir_notarget; 1474 debugfile += debuglink; 1475 1476 if (separate_debug_file_exists (debugfile, crc32, objfile)) 1477 return debugfile; 1478 1479 const char *base_path = NULL; 1480 if (canon_dir != NULL) 1481 { 1482 if (canon_sysroot.get () != NULL) 1483 base_path = child_path (canon_sysroot.get (), canon_dir); 1484 else 1485 base_path = child_path (gdb_sysroot, canon_dir); 1486 } 1487 if (base_path != NULL) 1488 { 1489 /* If the file is in the sysroot, try using its base path in 1490 the global debugfile directory. */ 1491 debugfile = target_prefix ? "target:" : ""; 1492 debugfile += debugdir.get (); 1493 debugfile += "/"; 1494 debugfile += base_path; 1495 debugfile += "/"; 1496 debugfile += debuglink; 1497 1498 if (separate_debug_file_exists (debugfile, crc32, objfile)) 1499 return debugfile; 1500 1501 /* If the file is in the sysroot, try using its base path in 1502 the sysroot's global debugfile directory. */ 1503 debugfile = target_prefix ? "target:" : ""; 1504 debugfile += gdb_sysroot; 1505 debugfile += debugdir.get (); 1506 debugfile += "/"; 1507 debugfile += base_path; 1508 debugfile += "/"; 1509 debugfile += debuglink; 1510 1511 if (separate_debug_file_exists (debugfile, crc32, objfile)) 1512 return debugfile; 1513 } 1514 1515 } 1516 1517 return std::string (); 1518} 1519 1520/* Modify PATH to contain only "[/]directory/" part of PATH. 1521 If there were no directory separators in PATH, PATH will be empty 1522 string on return. */ 1523 1524static void 1525terminate_after_last_dir_separator (char *path) 1526{ 1527 int i; 1528 1529 /* Strip off the final filename part, leaving the directory name, 1530 followed by a slash. The directory can be relative or absolute. */ 1531 for (i = strlen(path) - 1; i >= 0; i--) 1532 if (IS_DIR_SEPARATOR (path[i])) 1533 break; 1534 1535 /* If I is -1 then no directory is present there and DIR will be "". */ 1536 path[i + 1] = '\0'; 1537} 1538 1539/* Find separate debuginfo for OBJFILE (using .gnu_debuglink section). 1540 Returns pathname, or an empty string. */ 1541 1542std::string 1543find_separate_debug_file_by_debuglink (struct objfile *objfile) 1544{ 1545 unsigned long crc32; 1546 1547 gdb::unique_xmalloc_ptr<char> debuglink 1548 (bfd_get_debug_link_info (objfile->obfd, &crc32)); 1549 1550 if (debuglink == NULL) 1551 { 1552 /* There's no separate debug info, hence there's no way we could 1553 load it => no warning. */ 1554 return std::string (); 1555 } 1556 1557 std::string dir = objfile_name (objfile); 1558 terminate_after_last_dir_separator (&dir[0]); 1559 gdb::unique_xmalloc_ptr<char> canon_dir (lrealpath (dir.c_str ())); 1560 1561 std::string debugfile 1562 = find_separate_debug_file (dir.c_str (), canon_dir.get (), 1563 debuglink.get (), crc32, objfile); 1564 1565 if (debugfile.empty ()) 1566 { 1567 /* For PR gdb/9538, try again with realpath (if different from the 1568 original). */ 1569 1570 struct stat st_buf; 1571 1572 if (lstat (objfile_name (objfile), &st_buf) == 0 1573 && S_ISLNK (st_buf.st_mode)) 1574 { 1575 gdb::unique_xmalloc_ptr<char> symlink_dir 1576 (lrealpath (objfile_name (objfile))); 1577 if (symlink_dir != NULL) 1578 { 1579 terminate_after_last_dir_separator (symlink_dir.get ()); 1580 if (dir != symlink_dir.get ()) 1581 { 1582 /* Different directory, so try using it. */ 1583 debugfile = find_separate_debug_file (symlink_dir.get (), 1584 symlink_dir.get (), 1585 debuglink.get (), 1586 crc32, 1587 objfile); 1588 } 1589 } 1590 } 1591 } 1592 1593 return debugfile; 1594} 1595 1596/* Make sure that OBJF_{READNOW,READNEVER} are not set 1597 simultaneously. */ 1598 1599static void 1600validate_readnow_readnever (objfile_flags flags) 1601{ 1602 if ((flags & OBJF_READNOW) && (flags & OBJF_READNEVER)) 1603 error (_("-readnow and -readnever cannot be used simultaneously")); 1604} 1605 1606/* This is the symbol-file command. Read the file, analyze its 1607 symbols, and add a struct symtab to a symtab list. The syntax of 1608 the command is rather bizarre: 1609 1610 1. The function buildargv implements various quoting conventions 1611 which are undocumented and have little or nothing in common with 1612 the way things are quoted (or not quoted) elsewhere in GDB. 1613 1614 2. Options are used, which are not generally used in GDB (perhaps 1615 "set mapped on", "set readnow on" would be better) 1616 1617 3. The order of options matters, which is contrary to GNU 1618 conventions (because it is confusing and inconvenient). */ 1619 1620void 1621symbol_file_command (const char *args, int from_tty) 1622{ 1623 dont_repeat (); 1624 1625 if (args == NULL) 1626 { 1627 symbol_file_clear (from_tty); 1628 } 1629 else 1630 { 1631 objfile_flags flags = OBJF_USERLOADED; 1632 symfile_add_flags add_flags = 0; 1633 char *name = NULL; 1634 bool stop_processing_options = false; 1635 CORE_ADDR offset = 0; 1636 int idx; 1637 char *arg; 1638 1639 if (from_tty) 1640 add_flags |= SYMFILE_VERBOSE; 1641 1642 gdb_argv built_argv (args); 1643 for (arg = built_argv[0], idx = 0; arg != NULL; arg = built_argv[++idx]) 1644 { 1645 if (stop_processing_options || *arg != '-') 1646 { 1647 if (name == NULL) 1648 name = arg; 1649 else 1650 error (_("Unrecognized argument \"%s\""), arg); 1651 } 1652 else if (strcmp (arg, "-readnow") == 0) 1653 flags |= OBJF_READNOW; 1654 else if (strcmp (arg, "-readnever") == 0) 1655 flags |= OBJF_READNEVER; 1656 else if (strcmp (arg, "-o") == 0) 1657 { 1658 arg = built_argv[++idx]; 1659 if (arg == NULL) 1660 error (_("Missing argument to -o")); 1661 1662 offset = parse_and_eval_address (arg); 1663 } 1664 else if (strcmp (arg, "--") == 0) 1665 stop_processing_options = true; 1666 else 1667 error (_("Unrecognized argument \"%s\""), arg); 1668 } 1669 1670 if (name == NULL) 1671 error (_("no symbol file name was specified")); 1672 1673 validate_readnow_readnever (flags); 1674 1675 symbol_file_add_main_1 (name, add_flags, flags, offset); 1676 } 1677} 1678 1679/* Set the initial language. 1680 1681 FIXME: A better solution would be to record the language in the 1682 psymtab when reading partial symbols, and then use it (if known) to 1683 set the language. This would be a win for formats that encode the 1684 language in an easily discoverable place, such as DWARF. For 1685 stabs, we can jump through hoops looking for specially named 1686 symbols or try to intuit the language from the specific type of 1687 stabs we find, but we can't do that until later when we read in 1688 full symbols. */ 1689 1690void 1691set_initial_language (void) 1692{ 1693 enum language lang = main_language (); 1694 1695 if (lang == language_unknown) 1696 { 1697 char *name = main_name (); 1698 struct symbol *sym = lookup_symbol (name, NULL, VAR_DOMAIN, NULL).symbol; 1699 1700 if (sym != NULL) 1701 lang = SYMBOL_LANGUAGE (sym); 1702 } 1703 1704 if (lang == language_unknown) 1705 { 1706 /* Make C the default language */ 1707 lang = language_c; 1708 } 1709 1710 set_language (lang); 1711 expected_language = current_language; /* Don't warn the user. */ 1712} 1713 1714/* Open the file specified by NAME and hand it off to BFD for 1715 preliminary analysis. Return a newly initialized bfd *, which 1716 includes a newly malloc'd` copy of NAME (tilde-expanded and made 1717 absolute). In case of trouble, error() is called. */ 1718 1719gdb_bfd_ref_ptr 1720symfile_bfd_open (const char *name) 1721{ 1722 int desc = -1; 1723 1724 gdb::unique_xmalloc_ptr<char> absolute_name; 1725 if (!is_target_filename (name)) 1726 { 1727 gdb::unique_xmalloc_ptr<char> expanded_name (tilde_expand (name)); 1728 1729 /* Look down path for it, allocate 2nd new malloc'd copy. */ 1730 desc = openp (getenv ("PATH"), 1731 OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH, 1732 expanded_name.get (), O_RDONLY | O_BINARY, &absolute_name); 1733#if defined(__GO32__) || defined(_WIN32) || defined (__CYGWIN__) 1734 if (desc < 0) 1735 { 1736 char *exename = (char *) alloca (strlen (expanded_name.get ()) + 5); 1737 1738 strcat (strcpy (exename, expanded_name.get ()), ".exe"); 1739 desc = openp (getenv ("PATH"), 1740 OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH, 1741 exename, O_RDONLY | O_BINARY, &absolute_name); 1742 } 1743#endif 1744 if (desc < 0) 1745 perror_with_name (expanded_name.get ()); 1746 1747 name = absolute_name.get (); 1748 } 1749 1750 gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (name, gnutarget, desc)); 1751 if (sym_bfd == NULL) 1752 error (_("`%s': can't open to read symbols: %s."), name, 1753 bfd_errmsg (bfd_get_error ())); 1754 1755 if (!gdb_bfd_has_target_filename (sym_bfd.get ())) 1756 bfd_set_cacheable (sym_bfd.get (), 1); 1757 1758 if (!bfd_check_format (sym_bfd.get (), bfd_object)) 1759 error (_("`%s': can't read symbols: %s."), name, 1760 bfd_errmsg (bfd_get_error ())); 1761 1762 return sym_bfd; 1763} 1764 1765/* Return the section index for SECTION_NAME on OBJFILE. Return -1 if 1766 the section was not found. */ 1767 1768int 1769get_section_index (struct objfile *objfile, const char *section_name) 1770{ 1771 asection *sect = bfd_get_section_by_name (objfile->obfd, section_name); 1772 1773 if (sect) 1774 return sect->index; 1775 else 1776 return -1; 1777} 1778 1779/* Link SF into the global symtab_fns list. 1780 FLAVOUR is the file format that SF handles. 1781 Called on startup by the _initialize routine in each object file format 1782 reader, to register information about each format the reader is prepared 1783 to handle. */ 1784 1785void 1786add_symtab_fns (enum bfd_flavour flavour, const struct sym_fns *sf) 1787{ 1788 symtab_fns.emplace_back (flavour, sf); 1789} 1790 1791/* Initialize OBJFILE to read symbols from its associated BFD. It 1792 either returns or calls error(). The result is an initialized 1793 struct sym_fns in the objfile structure, that contains cached 1794 information about the symbol file. */ 1795 1796static const struct sym_fns * 1797find_sym_fns (bfd *abfd) 1798{ 1799 enum bfd_flavour our_flavour = bfd_get_flavour (abfd); 1800 1801 if (our_flavour == bfd_target_srec_flavour 1802 || our_flavour == bfd_target_ihex_flavour 1803 || our_flavour == bfd_target_tekhex_flavour) 1804 return NULL; /* No symbols. */ 1805 1806 for (const registered_sym_fns &rsf : symtab_fns) 1807 if (our_flavour == rsf.sym_flavour) 1808 return rsf.sym_fns; 1809 1810 error (_("I'm sorry, Dave, I can't do that. Symbol format `%s' unknown."), 1811 bfd_get_target (abfd)); 1812} 1813 1814 1815/* This function runs the load command of our current target. */ 1816 1817static void 1818load_command (const char *arg, int from_tty) 1819{ 1820 dont_repeat (); 1821 1822 /* The user might be reloading because the binary has changed. Take 1823 this opportunity to check. */ 1824 reopen_exec_file (); 1825 reread_symbols (); 1826 1827 std::string temp; 1828 if (arg == NULL) 1829 { 1830 const char *parg, *prev; 1831 1832 arg = get_exec_file (1); 1833 1834 /* We may need to quote this string so buildargv can pull it 1835 apart. */ 1836 prev = parg = arg; 1837 while ((parg = strpbrk (parg, "\\\"'\t "))) 1838 { 1839 temp.append (prev, parg - prev); 1840 prev = parg++; 1841 temp.push_back ('\\'); 1842 } 1843 /* If we have not copied anything yet, then we didn't see a 1844 character to quote, and we can just leave ARG unchanged. */ 1845 if (!temp.empty ()) 1846 { 1847 temp.append (prev); 1848 arg = temp.c_str (); 1849 } 1850 } 1851 1852 target_load (arg, from_tty); 1853 1854 /* After re-loading the executable, we don't really know which 1855 overlays are mapped any more. */ 1856 overlay_cache_invalid = 1; 1857} 1858 1859/* This version of "load" should be usable for any target. Currently 1860 it is just used for remote targets, not inftarg.c or core files, 1861 on the theory that only in that case is it useful. 1862 1863 Avoiding xmodem and the like seems like a win (a) because we don't have 1864 to worry about finding it, and (b) On VMS, fork() is very slow and so 1865 we don't want to run a subprocess. On the other hand, I'm not sure how 1866 performance compares. */ 1867 1868static int validate_download = 0; 1869 1870/* Callback service function for generic_load (bfd_map_over_sections). */ 1871 1872static void 1873add_section_size_callback (bfd *abfd, asection *asec, void *data) 1874{ 1875 bfd_size_type *sum = (bfd_size_type *) data; 1876 1877 *sum += bfd_get_section_size (asec); 1878} 1879 1880/* Opaque data for load_progress. */ 1881struct load_progress_data 1882{ 1883 /* Cumulative data. */ 1884 unsigned long write_count = 0; 1885 unsigned long data_count = 0; 1886 bfd_size_type total_size = 0; 1887}; 1888 1889/* Opaque data for load_progress for a single section. */ 1890struct load_progress_section_data 1891{ 1892 load_progress_section_data (load_progress_data *cumulative_, 1893 const char *section_name_, ULONGEST section_size_, 1894 CORE_ADDR lma_, gdb_byte *buffer_) 1895 : cumulative (cumulative_), section_name (section_name_), 1896 section_size (section_size_), lma (lma_), buffer (buffer_) 1897 {} 1898 1899 struct load_progress_data *cumulative; 1900 1901 /* Per-section data. */ 1902 const char *section_name; 1903 ULONGEST section_sent = 0; 1904 ULONGEST section_size; 1905 CORE_ADDR lma; 1906 gdb_byte *buffer; 1907}; 1908 1909/* Opaque data for load_section_callback. */ 1910struct load_section_data 1911{ 1912 load_section_data (load_progress_data *progress_data_) 1913 : progress_data (progress_data_) 1914 {} 1915 1916 ~load_section_data () 1917 { 1918 for (auto &&request : requests) 1919 { 1920 xfree (request.data); 1921 delete ((load_progress_section_data *) request.baton); 1922 } 1923 } 1924 1925 CORE_ADDR load_offset = 0; 1926 struct load_progress_data *progress_data; 1927 std::vector<struct memory_write_request> requests; 1928}; 1929 1930/* Target write callback routine for progress reporting. */ 1931 1932static void 1933load_progress (ULONGEST bytes, void *untyped_arg) 1934{ 1935 struct load_progress_section_data *args 1936 = (struct load_progress_section_data *) untyped_arg; 1937 struct load_progress_data *totals; 1938 1939 if (args == NULL) 1940 /* Writing padding data. No easy way to get at the cumulative 1941 stats, so just ignore this. */ 1942 return; 1943 1944 totals = args->cumulative; 1945 1946 if (bytes == 0 && args->section_sent == 0) 1947 { 1948 /* The write is just starting. Let the user know we've started 1949 this section. */ 1950 current_uiout->message ("Loading section %s, size %s lma %s\n", 1951 args->section_name, 1952 hex_string (args->section_size), 1953 paddress (target_gdbarch (), args->lma)); 1954 return; 1955 } 1956 1957 if (validate_download) 1958 { 1959 /* Broken memories and broken monitors manifest themselves here 1960 when bring new computers to life. This doubles already slow 1961 downloads. */ 1962 /* NOTE: cagney/1999-10-18: A more efficient implementation 1963 might add a verify_memory() method to the target vector and 1964 then use that. remote.c could implement that method using 1965 the ``qCRC'' packet. */ 1966 gdb::byte_vector check (bytes); 1967 1968 if (target_read_memory (args->lma, check.data (), bytes) != 0) 1969 error (_("Download verify read failed at %s"), 1970 paddress (target_gdbarch (), args->lma)); 1971 if (memcmp (args->buffer, check.data (), bytes) != 0) 1972 error (_("Download verify compare failed at %s"), 1973 paddress (target_gdbarch (), args->lma)); 1974 } 1975 totals->data_count += bytes; 1976 args->lma += bytes; 1977 args->buffer += bytes; 1978 totals->write_count += 1; 1979 args->section_sent += bytes; 1980 if (check_quit_flag () 1981 || (deprecated_ui_load_progress_hook != NULL 1982 && deprecated_ui_load_progress_hook (args->section_name, 1983 args->section_sent))) 1984 error (_("Canceled the download")); 1985 1986 if (deprecated_show_load_progress != NULL) 1987 deprecated_show_load_progress (args->section_name, 1988 args->section_sent, 1989 args->section_size, 1990 totals->data_count, 1991 totals->total_size); 1992} 1993 1994/* Callback service function for generic_load (bfd_map_over_sections). */ 1995 1996static void 1997load_section_callback (bfd *abfd, asection *asec, void *data) 1998{ 1999 struct load_section_data *args = (struct load_section_data *) data; 2000 bfd_size_type size = bfd_get_section_size (asec); 2001 const char *sect_name = bfd_get_section_name (abfd, asec); 2002 2003 if ((bfd_get_section_flags (abfd, asec) & SEC_LOAD) == 0) 2004 return; 2005 2006 if (size == 0) 2007 return; 2008 2009 ULONGEST begin = bfd_section_lma (abfd, asec) + args->load_offset; 2010 ULONGEST end = begin + size; 2011 gdb_byte *buffer = (gdb_byte *) xmalloc (size); 2012 bfd_get_section_contents (abfd, asec, buffer, 0, size); 2013 2014 load_progress_section_data *section_data 2015 = new load_progress_section_data (args->progress_data, sect_name, size, 2016 begin, buffer); 2017 2018 args->requests.emplace_back (begin, end, buffer, section_data); 2019} 2020 2021static void print_transfer_performance (struct ui_file *stream, 2022 unsigned long data_count, 2023 unsigned long write_count, 2024 std::chrono::steady_clock::duration d); 2025 2026void 2027generic_load (const char *args, int from_tty) 2028{ 2029 struct load_progress_data total_progress; 2030 struct load_section_data cbdata (&total_progress); 2031 struct ui_out *uiout = current_uiout; 2032 2033 if (args == NULL) 2034 error_no_arg (_("file to load")); 2035 2036 gdb_argv argv (args); 2037 2038 gdb::unique_xmalloc_ptr<char> filename (tilde_expand (argv[0])); 2039 2040 if (argv[1] != NULL) 2041 { 2042 const char *endptr; 2043 2044 cbdata.load_offset = strtoulst (argv[1], &endptr, 0); 2045 2046 /* If the last word was not a valid number then 2047 treat it as a file name with spaces in. */ 2048 if (argv[1] == endptr) 2049 error (_("Invalid download offset:%s."), argv[1]); 2050 2051 if (argv[2] != NULL) 2052 error (_("Too many parameters.")); 2053 } 2054 2055 /* Open the file for loading. */ 2056 gdb_bfd_ref_ptr loadfile_bfd (gdb_bfd_open (filename.get (), gnutarget, -1)); 2057 if (loadfile_bfd == NULL) 2058 perror_with_name (filename.get ()); 2059 2060 if (!bfd_check_format (loadfile_bfd.get (), bfd_object)) 2061 { 2062 error (_("\"%s\" is not an object file: %s"), filename.get (), 2063 bfd_errmsg (bfd_get_error ())); 2064 } 2065 2066 bfd_map_over_sections (loadfile_bfd.get (), add_section_size_callback, 2067 (void *) &total_progress.total_size); 2068 2069 bfd_map_over_sections (loadfile_bfd.get (), load_section_callback, &cbdata); 2070 2071 using namespace std::chrono; 2072 2073 steady_clock::time_point start_time = steady_clock::now (); 2074 2075 if (target_write_memory_blocks (cbdata.requests, flash_discard, 2076 load_progress) != 0) 2077 error (_("Load failed")); 2078 2079 steady_clock::time_point end_time = steady_clock::now (); 2080 2081 CORE_ADDR entry = bfd_get_start_address (loadfile_bfd.get ()); 2082 entry = gdbarch_addr_bits_remove (target_gdbarch (), entry); 2083 uiout->text ("Start address "); 2084 uiout->field_fmt ("address", "%s", paddress (target_gdbarch (), entry)); 2085 uiout->text (", load size "); 2086 uiout->field_fmt ("load-size", "%lu", total_progress.data_count); 2087 uiout->text ("\n"); 2088 regcache_write_pc (get_current_regcache (), entry); 2089 2090 /* Reset breakpoints, now that we have changed the load image. For 2091 instance, breakpoints may have been set (or reset, by 2092 post_create_inferior) while connected to the target but before we 2093 loaded the program. In that case, the prologue analyzer could 2094 have read instructions from the target to find the right 2095 breakpoint locations. Loading has changed the contents of that 2096 memory. */ 2097 2098 breakpoint_re_set (); 2099 2100 print_transfer_performance (gdb_stdout, total_progress.data_count, 2101 total_progress.write_count, 2102 end_time - start_time); 2103} 2104 2105/* Report on STREAM the performance of a memory transfer operation, 2106 such as 'load'. DATA_COUNT is the number of bytes transferred. 2107 WRITE_COUNT is the number of separate write operations, or 0, if 2108 that information is not available. TIME is how long the operation 2109 lasted. */ 2110 2111static void 2112print_transfer_performance (struct ui_file *stream, 2113 unsigned long data_count, 2114 unsigned long write_count, 2115 std::chrono::steady_clock::duration time) 2116{ 2117 using namespace std::chrono; 2118 struct ui_out *uiout = current_uiout; 2119 2120 milliseconds ms = duration_cast<milliseconds> (time); 2121 2122 uiout->text ("Transfer rate: "); 2123 if (ms.count () > 0) 2124 { 2125 unsigned long rate = ((ULONGEST) data_count * 1000) / ms.count (); 2126 2127 if (uiout->is_mi_like_p ()) 2128 { 2129 uiout->field_fmt ("transfer-rate", "%lu", rate * 8); 2130 uiout->text (" bits/sec"); 2131 } 2132 else if (rate < 1024) 2133 { 2134 uiout->field_fmt ("transfer-rate", "%lu", rate); 2135 uiout->text (" bytes/sec"); 2136 } 2137 else 2138 { 2139 uiout->field_fmt ("transfer-rate", "%lu", rate / 1024); 2140 uiout->text (" KB/sec"); 2141 } 2142 } 2143 else 2144 { 2145 uiout->field_fmt ("transferred-bits", "%lu", (data_count * 8)); 2146 uiout->text (" bits in <1 sec"); 2147 } 2148 if (write_count > 0) 2149 { 2150 uiout->text (", "); 2151 uiout->field_fmt ("write-rate", "%lu", data_count / write_count); 2152 uiout->text (" bytes/write"); 2153 } 2154 uiout->text (".\n"); 2155} 2156 2157/* Add an OFFSET to the start address of each section in OBJF, except 2158 sections that were specified in ADDRS. */ 2159 2160static void 2161set_objfile_default_section_offset (struct objfile *objf, 2162 const section_addr_info &addrs, 2163 CORE_ADDR offset) 2164{ 2165 /* Add OFFSET to all sections by default. */ 2166 std::vector<struct section_offsets> offsets (objf->num_sections, 2167 { { offset } }); 2168 2169 /* Create sorted lists of all sections in ADDRS as well as all 2170 sections in OBJF. */ 2171 2172 std::vector<const struct other_sections *> addrs_sorted 2173 = addrs_section_sort (addrs); 2174 2175 section_addr_info objf_addrs 2176 = build_section_addr_info_from_objfile (objf); 2177 std::vector<const struct other_sections *> objf_addrs_sorted 2178 = addrs_section_sort (objf_addrs); 2179 2180 /* Walk the BFD section list, and if a matching section is found in 2181 ADDRS_SORTED_LIST, set its offset to zero to keep its address 2182 unchanged. 2183 2184 Note that both lists may contain multiple sections with the same 2185 name, and then the sections from ADDRS are matched in BFD order 2186 (thanks to sectindex). */ 2187 2188 std::vector<const struct other_sections *>::iterator addrs_sorted_iter 2189 = addrs_sorted.begin (); 2190 for (const other_sections *objf_sect : objf_addrs_sorted) 2191 { 2192 const char *objf_name = addr_section_name (objf_sect->name.c_str ()); 2193 int cmp = -1; 2194 2195 while (cmp < 0 && addrs_sorted_iter != addrs_sorted.end ()) 2196 { 2197 const struct other_sections *sect = *addrs_sorted_iter; 2198 const char *sect_name = addr_section_name (sect->name.c_str ()); 2199 cmp = strcmp (sect_name, objf_name); 2200 if (cmp <= 0) 2201 ++addrs_sorted_iter; 2202 } 2203 2204 if (cmp == 0) 2205 offsets[objf_sect->sectindex].offsets[0] = 0; 2206 } 2207 2208 /* Apply the new section offsets. */ 2209 objfile_relocate (objf, offsets.data ()); 2210} 2211 2212/* This function allows the addition of incrementally linked object files. 2213 It does not modify any state in the target, only in the debugger. */ 2214/* Note: ezannoni 2000-04-13 This function/command used to have a 2215 special case syntax for the rombug target (Rombug is the boot 2216 monitor for Microware's OS-9 / OS-9000, see remote-os9k.c). In the 2217 rombug case, the user doesn't need to supply a text address, 2218 instead a call to target_link() (in target.c) would supply the 2219 value to use. We are now discontinuing this type of ad hoc syntax. */ 2220 2221static void 2222add_symbol_file_command (const char *args, int from_tty) 2223{ 2224 struct gdbarch *gdbarch = get_current_arch (); 2225 gdb::unique_xmalloc_ptr<char> filename; 2226 char *arg; 2227 int argcnt = 0; 2228 struct objfile *objf; 2229 objfile_flags flags = OBJF_USERLOADED | OBJF_SHARED; 2230 symfile_add_flags add_flags = 0; 2231 2232 if (from_tty) 2233 add_flags |= SYMFILE_VERBOSE; 2234 2235 struct sect_opt 2236 { 2237 const char *name; 2238 const char *value; 2239 }; 2240 2241 std::vector<sect_opt> sect_opts = { { ".text", NULL } }; 2242 bool stop_processing_options = false; 2243 CORE_ADDR offset = 0; 2244 2245 dont_repeat (); 2246 2247 if (args == NULL) 2248 error (_("add-symbol-file takes a file name and an address")); 2249 2250 bool seen_addr = false; 2251 bool seen_offset = false; 2252 gdb_argv argv (args); 2253 2254 for (arg = argv[0], argcnt = 0; arg != NULL; arg = argv[++argcnt]) 2255 { 2256 if (stop_processing_options || *arg != '-') 2257 { 2258 if (filename == NULL) 2259 { 2260 /* First non-option argument is always the filename. */ 2261 filename.reset (tilde_expand (arg)); 2262 } 2263 else if (!seen_addr) 2264 { 2265 /* The second non-option argument is always the text 2266 address at which to load the program. */ 2267 sect_opts[0].value = arg; 2268 seen_addr = true; 2269 } 2270 else 2271 error (_("Unrecognized argument \"%s\""), arg); 2272 } 2273 else if (strcmp (arg, "-readnow") == 0) 2274 flags |= OBJF_READNOW; 2275 else if (strcmp (arg, "-readnever") == 0) 2276 flags |= OBJF_READNEVER; 2277 else if (strcmp (arg, "-s") == 0) 2278 { 2279 if (argv[argcnt + 1] == NULL) 2280 error (_("Missing section name after \"-s\"")); 2281 else if (argv[argcnt + 2] == NULL) 2282 error (_("Missing section address after \"-s\"")); 2283 2284 sect_opt sect = { argv[argcnt + 1], argv[argcnt + 2] }; 2285 2286 sect_opts.push_back (sect); 2287 argcnt += 2; 2288 } 2289 else if (strcmp (arg, "-o") == 0) 2290 { 2291 arg = argv[++argcnt]; 2292 if (arg == NULL) 2293 error (_("Missing argument to -o")); 2294 2295 offset = parse_and_eval_address (arg); 2296 seen_offset = true; 2297 } 2298 else if (strcmp (arg, "--") == 0) 2299 stop_processing_options = true; 2300 else 2301 error (_("Unrecognized argument \"%s\""), arg); 2302 } 2303 2304 if (filename == NULL) 2305 error (_("You must provide a filename to be loaded.")); 2306 2307 validate_readnow_readnever (flags); 2308 2309 /* Print the prompt for the query below. And save the arguments into 2310 a sect_addr_info structure to be passed around to other 2311 functions. We have to split this up into separate print 2312 statements because hex_string returns a local static 2313 string. */ 2314 2315 printf_unfiltered (_("add symbol table from file \"%s\""), 2316 filename.get ()); 2317 section_addr_info section_addrs; 2318 std::vector<sect_opt>::const_iterator it = sect_opts.begin (); 2319 if (!seen_addr) 2320 ++it; 2321 for (; it != sect_opts.end (); ++it) 2322 { 2323 CORE_ADDR addr; 2324 const char *val = it->value; 2325 const char *sec = it->name; 2326 2327 if (section_addrs.empty ()) 2328 printf_unfiltered (_(" at\n")); 2329 addr = parse_and_eval_address (val); 2330 2331 /* Here we store the section offsets in the order they were 2332 entered on the command line. Every array element is 2333 assigned an ascending section index to preserve the above 2334 order over an unstable sorting algorithm. This dummy 2335 index is not used for any other purpose. 2336 */ 2337 section_addrs.emplace_back (addr, sec, section_addrs.size ()); 2338 printf_filtered ("\t%s_addr = %s\n", sec, 2339 paddress (gdbarch, addr)); 2340 2341 /* The object's sections are initialized when a 2342 call is made to build_objfile_section_table (objfile). 2343 This happens in reread_symbols. 2344 At this point, we don't know what file type this is, 2345 so we can't determine what section names are valid. */ 2346 } 2347 if (seen_offset) 2348 printf_unfiltered (_("%s offset by %s\n"), 2349 (section_addrs.empty () 2350 ? _(" with all sections") 2351 : _("with other sections")), 2352 paddress (gdbarch, offset)); 2353 else if (section_addrs.empty ()) 2354 printf_unfiltered ("\n"); 2355 2356 if (from_tty && (!query ("%s", ""))) 2357 error (_("Not confirmed.")); 2358 2359 objf = symbol_file_add (filename.get (), add_flags, §ion_addrs, 2360 flags); 2361 2362 if (seen_offset) 2363 set_objfile_default_section_offset (objf, section_addrs, offset); 2364 2365 add_target_sections_of_objfile (objf); 2366 2367 /* Getting new symbols may change our opinion about what is 2368 frameless. */ 2369 reinit_frame_cache (); 2370} 2371 2372 2373/* This function removes a symbol file that was added via add-symbol-file. */ 2374 2375static void 2376remove_symbol_file_command (const char *args, int from_tty) 2377{ 2378 struct objfile *objf = NULL; 2379 struct program_space *pspace = current_program_space; 2380 2381 dont_repeat (); 2382 2383 if (args == NULL) 2384 error (_("remove-symbol-file: no symbol file provided")); 2385 2386 gdb_argv argv (args); 2387 2388 if (strcmp (argv[0], "-a") == 0) 2389 { 2390 /* Interpret the next argument as an address. */ 2391 CORE_ADDR addr; 2392 2393 if (argv[1] == NULL) 2394 error (_("Missing address argument")); 2395 2396 if (argv[2] != NULL) 2397 error (_("Junk after %s"), argv[1]); 2398 2399 addr = parse_and_eval_address (argv[1]); 2400 2401 for (objfile *objfile : current_program_space->objfiles ()) 2402 { 2403 if ((objfile->flags & OBJF_USERLOADED) != 0 2404 && (objfile->flags & OBJF_SHARED) != 0 2405 && objfile->pspace == pspace 2406 && is_addr_in_objfile (addr, objfile)) 2407 { 2408 objf = objfile; 2409 break; 2410 } 2411 } 2412 } 2413 else if (argv[0] != NULL) 2414 { 2415 /* Interpret the current argument as a file name. */ 2416 2417 if (argv[1] != NULL) 2418 error (_("Junk after %s"), argv[0]); 2419 2420 gdb::unique_xmalloc_ptr<char> filename (tilde_expand (argv[0])); 2421 2422 for (objfile *objfile : current_program_space->objfiles ()) 2423 { 2424 if ((objfile->flags & OBJF_USERLOADED) != 0 2425 && (objfile->flags & OBJF_SHARED) != 0 2426 && objfile->pspace == pspace 2427 && filename_cmp (filename.get (), objfile_name (objfile)) == 0) 2428 { 2429 objf = objfile; 2430 break; 2431 } 2432 } 2433 } 2434 2435 if (objf == NULL) 2436 error (_("No symbol file found")); 2437 2438 if (from_tty 2439 && !query (_("Remove symbol table from file \"%s\"? "), 2440 objfile_name (objf))) 2441 error (_("Not confirmed.")); 2442 2443 delete objf; 2444 clear_symtab_users (0); 2445} 2446 2447/* Re-read symbols if a symbol-file has changed. */ 2448 2449void 2450reread_symbols (void) 2451{ 2452 struct objfile *objfile; 2453 long new_modtime; 2454 struct stat new_statbuf; 2455 int res; 2456 std::vector<struct objfile *> new_objfiles; 2457 2458 /* With the addition of shared libraries, this should be modified, 2459 the load time should be saved in the partial symbol tables, since 2460 different tables may come from different source files. FIXME. 2461 This routine should then walk down each partial symbol table 2462 and see if the symbol table that it originates from has been changed. */ 2463 2464 for (objfile = object_files; objfile; objfile = objfile->next) 2465 { 2466 if (objfile->obfd == NULL) 2467 continue; 2468 2469 /* Separate debug objfiles are handled in the main objfile. */ 2470 if (objfile->separate_debug_objfile_backlink) 2471 continue; 2472 2473 /* If this object is from an archive (what you usually create with 2474 `ar', often called a `static library' on most systems, though 2475 a `shared library' on AIX is also an archive), then you should 2476 stat on the archive name, not member name. */ 2477 if (objfile->obfd->my_archive) 2478 res = stat (objfile->obfd->my_archive->filename, &new_statbuf); 2479 else 2480 res = stat (objfile_name (objfile), &new_statbuf); 2481 if (res != 0) 2482 { 2483 /* FIXME, should use print_sys_errmsg but it's not filtered. */ 2484 printf_filtered (_("`%s' has disappeared; keeping its symbols.\n"), 2485 objfile_name (objfile)); 2486 continue; 2487 } 2488 new_modtime = new_statbuf.st_mtime; 2489 if (new_modtime != objfile->mtime) 2490 { 2491 struct section_offsets *offsets; 2492 int num_offsets; 2493 2494 printf_filtered (_("`%s' has changed; re-reading symbols.\n"), 2495 objfile_name (objfile)); 2496 2497 /* There are various functions like symbol_file_add, 2498 symfile_bfd_open, syms_from_objfile, etc., which might 2499 appear to do what we want. But they have various other 2500 effects which we *don't* want. So we just do stuff 2501 ourselves. We don't worry about mapped files (for one thing, 2502 any mapped file will be out of date). */ 2503 2504 /* If we get an error, blow away this objfile (not sure if 2505 that is the correct response for things like shared 2506 libraries). */ 2507 std::unique_ptr<struct objfile> objfile_holder (objfile); 2508 2509 /* We need to do this whenever any symbols go away. */ 2510 clear_symtab_users_cleanup defer_clear_users (0); 2511 2512 if (exec_bfd != NULL 2513 && filename_cmp (bfd_get_filename (objfile->obfd), 2514 bfd_get_filename (exec_bfd)) == 0) 2515 { 2516 /* Reload EXEC_BFD without asking anything. */ 2517 2518 exec_file_attach (bfd_get_filename (objfile->obfd), 0); 2519 } 2520 2521 /* Keep the calls order approx. the same as in free_objfile. */ 2522 2523 /* Free the separate debug objfiles. It will be 2524 automatically recreated by sym_read. */ 2525 free_objfile_separate_debug (objfile); 2526 2527 /* Remove any references to this objfile in the global 2528 value lists. */ 2529 preserve_values (objfile); 2530 2531 /* Nuke all the state that we will re-read. Much of the following 2532 code which sets things to NULL really is necessary to tell 2533 other parts of GDB that there is nothing currently there. 2534 2535 Try to keep the freeing order compatible with free_objfile. */ 2536 2537 if (objfile->sf != NULL) 2538 { 2539 (*objfile->sf->sym_finish) (objfile); 2540 } 2541 2542 clear_objfile_data (objfile); 2543 2544 /* Clean up any state BFD has sitting around. */ 2545 { 2546 gdb_bfd_ref_ptr obfd (objfile->obfd); 2547 char *obfd_filename; 2548 2549 obfd_filename = bfd_get_filename (objfile->obfd); 2550 /* Open the new BFD before freeing the old one, so that 2551 the filename remains live. */ 2552 gdb_bfd_ref_ptr temp (gdb_bfd_open (obfd_filename, gnutarget, -1)); 2553 objfile->obfd = temp.release (); 2554 if (objfile->obfd == NULL) 2555 error (_("Can't open %s to read symbols."), obfd_filename); 2556 } 2557 2558 std::string original_name = objfile->original_name; 2559 2560 /* bfd_openr sets cacheable to true, which is what we want. */ 2561 if (!bfd_check_format (objfile->obfd, bfd_object)) 2562 error (_("Can't read symbols from %s: %s."), objfile_name (objfile), 2563 bfd_errmsg (bfd_get_error ())); 2564 2565 /* Save the offsets, we will nuke them with the rest of the 2566 objfile_obstack. */ 2567 num_offsets = objfile->num_sections; 2568 offsets = ((struct section_offsets *) 2569 alloca (SIZEOF_N_SECTION_OFFSETS (num_offsets))); 2570 memcpy (offsets, objfile->section_offsets, 2571 SIZEOF_N_SECTION_OFFSETS (num_offsets)); 2572 2573 objfile->reset_psymtabs (); 2574 2575 /* NB: after this call to obstack_free, objfiles_changed 2576 will need to be called (see discussion below). */ 2577 obstack_free (&objfile->objfile_obstack, 0); 2578 objfile->sections = NULL; 2579 objfile->compunit_symtabs = NULL; 2580 objfile->template_symbols = NULL; 2581 objfile->static_links = NULL; 2582 2583 /* obstack_init also initializes the obstack so it is 2584 empty. We could use obstack_specify_allocation but 2585 gdb_obstack.h specifies the alloc/dealloc functions. */ 2586 obstack_init (&objfile->objfile_obstack); 2587 2588 /* set_objfile_per_bfd potentially allocates the per-bfd 2589 data on the objfile's obstack (if sharing data across 2590 multiple users is not possible), so it's important to 2591 do it *after* the obstack has been initialized. */ 2592 set_objfile_per_bfd (objfile); 2593 2594 objfile->original_name 2595 = (char *) obstack_copy0 (&objfile->objfile_obstack, 2596 original_name.c_str (), 2597 original_name.size ()); 2598 2599 /* Reset the sym_fns pointer. The ELF reader can change it 2600 based on whether .gdb_index is present, and we need it to 2601 start over. PR symtab/15885 */ 2602 objfile_set_sym_fns (objfile, find_sym_fns (objfile->obfd)); 2603 2604 build_objfile_section_table (objfile); 2605 terminate_minimal_symbol_table (objfile); 2606 2607 /* We use the same section offsets as from last time. I'm not 2608 sure whether that is always correct for shared libraries. */ 2609 objfile->section_offsets = (struct section_offsets *) 2610 obstack_alloc (&objfile->objfile_obstack, 2611 SIZEOF_N_SECTION_OFFSETS (num_offsets)); 2612 memcpy (objfile->section_offsets, offsets, 2613 SIZEOF_N_SECTION_OFFSETS (num_offsets)); 2614 objfile->num_sections = num_offsets; 2615 2616 /* What the hell is sym_new_init for, anyway? The concept of 2617 distinguishing between the main file and additional files 2618 in this way seems rather dubious. */ 2619 if (objfile == symfile_objfile) 2620 { 2621 (*objfile->sf->sym_new_init) (objfile); 2622 } 2623 2624 (*objfile->sf->sym_init) (objfile); 2625 clear_complaints (); 2626 2627 objfile->flags &= ~OBJF_PSYMTABS_READ; 2628 2629 /* We are about to read new symbols and potentially also 2630 DWARF information. Some targets may want to pass addresses 2631 read from DWARF DIE's through an adjustment function before 2632 saving them, like MIPS, which may call into 2633 "find_pc_section". When called, that function will make 2634 use of per-objfile program space data. 2635 2636 Since we discarded our section information above, we have 2637 dangling pointers in the per-objfile program space data 2638 structure. Force GDB to update the section mapping 2639 information by letting it know the objfile has changed, 2640 making the dangling pointers point to correct data 2641 again. */ 2642 2643 objfiles_changed (); 2644 2645 read_symbols (objfile, 0); 2646 2647 if (!objfile_has_symbols (objfile)) 2648 { 2649 wrap_here (""); 2650 printf_filtered (_("(no debugging symbols found)\n")); 2651 wrap_here (""); 2652 } 2653 2654 /* We're done reading the symbol file; finish off complaints. */ 2655 clear_complaints (); 2656 2657 /* Getting new symbols may change our opinion about what is 2658 frameless. */ 2659 2660 reinit_frame_cache (); 2661 2662 /* Discard cleanups as symbol reading was successful. */ 2663 objfile_holder.release (); 2664 defer_clear_users.release (); 2665 2666 /* If the mtime has changed between the time we set new_modtime 2667 and now, we *want* this to be out of date, so don't call stat 2668 again now. */ 2669 objfile->mtime = new_modtime; 2670 init_entry_point_info (objfile); 2671 2672 new_objfiles.push_back (objfile); 2673 } 2674 } 2675 2676 if (!new_objfiles.empty ()) 2677 { 2678 clear_symtab_users (0); 2679 2680 /* clear_objfile_data for each objfile was called before freeing it and 2681 gdb::observers::new_objfile.notify (NULL) has been called by 2682 clear_symtab_users above. Notify the new files now. */ 2683 for (auto iter : new_objfiles) 2684 gdb::observers::new_objfile.notify (iter); 2685 2686 /* At least one objfile has changed, so we can consider that 2687 the executable we're debugging has changed too. */ 2688 gdb::observers::executable_changed.notify (); 2689 } 2690} 2691 2692 2693struct filename_language 2694{ 2695 filename_language (const std::string &ext_, enum language lang_) 2696 : ext (ext_), lang (lang_) 2697 {} 2698 2699 std::string ext; 2700 enum language lang; 2701}; 2702 2703static std::vector<filename_language> filename_language_table; 2704 2705/* See symfile.h. */ 2706 2707void 2708add_filename_language (const char *ext, enum language lang) 2709{ 2710 filename_language_table.emplace_back (ext, lang); 2711} 2712 2713static char *ext_args; 2714static void 2715show_ext_args (struct ui_file *file, int from_tty, 2716 struct cmd_list_element *c, const char *value) 2717{ 2718 fprintf_filtered (file, 2719 _("Mapping between filename extension " 2720 "and source language is \"%s\".\n"), 2721 value); 2722} 2723 2724static void 2725set_ext_lang_command (const char *args, 2726 int from_tty, struct cmd_list_element *e) 2727{ 2728 char *cp = ext_args; 2729 enum language lang; 2730 2731 /* First arg is filename extension, starting with '.' */ 2732 if (*cp != '.') 2733 error (_("'%s': Filename extension must begin with '.'"), ext_args); 2734 2735 /* Find end of first arg. */ 2736 while (*cp && !isspace (*cp)) 2737 cp++; 2738 2739 if (*cp == '\0') 2740 error (_("'%s': two arguments required -- " 2741 "filename extension and language"), 2742 ext_args); 2743 2744 /* Null-terminate first arg. */ 2745 *cp++ = '\0'; 2746 2747 /* Find beginning of second arg, which should be a source language. */ 2748 cp = skip_spaces (cp); 2749 2750 if (*cp == '\0') 2751 error (_("'%s': two arguments required -- " 2752 "filename extension and language"), 2753 ext_args); 2754 2755 /* Lookup the language from among those we know. */ 2756 lang = language_enum (cp); 2757 2758 auto it = filename_language_table.begin (); 2759 /* Now lookup the filename extension: do we already know it? */ 2760 for (; it != filename_language_table.end (); it++) 2761 { 2762 if (it->ext == ext_args) 2763 break; 2764 } 2765 2766 if (it == filename_language_table.end ()) 2767 { 2768 /* New file extension. */ 2769 add_filename_language (ext_args, lang); 2770 } 2771 else 2772 { 2773 /* Redefining a previously known filename extension. */ 2774 2775 /* if (from_tty) */ 2776 /* query ("Really make files of type %s '%s'?", */ 2777 /* ext_args, language_str (lang)); */ 2778 2779 it->lang = lang; 2780 } 2781} 2782 2783static void 2784info_ext_lang_command (const char *args, int from_tty) 2785{ 2786 printf_filtered (_("Filename extensions and the languages they represent:")); 2787 printf_filtered ("\n\n"); 2788 for (const filename_language &entry : filename_language_table) 2789 printf_filtered ("\t%s\t- %s\n", entry.ext.c_str (), 2790 language_str (entry.lang)); 2791} 2792 2793enum language 2794deduce_language_from_filename (const char *filename) 2795{ 2796 const char *cp; 2797 2798 if (filename != NULL) 2799 if ((cp = strrchr (filename, '.')) != NULL) 2800 { 2801 for (const filename_language &entry : filename_language_table) 2802 if (entry.ext == cp) 2803 return entry.lang; 2804 } 2805 2806 return language_unknown; 2807} 2808 2809/* Allocate and initialize a new symbol table. 2810 CUST is from the result of allocate_compunit_symtab. */ 2811 2812struct symtab * 2813allocate_symtab (struct compunit_symtab *cust, const char *filename) 2814{ 2815 struct objfile *objfile = cust->objfile; 2816 struct symtab *symtab 2817 = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct symtab); 2818 2819 symtab->filename 2820 = (const char *) bcache (filename, strlen (filename) + 1, 2821 objfile->per_bfd->filename_cache); 2822 symtab->fullname = NULL; 2823 symtab->language = deduce_language_from_filename (filename); 2824 2825 /* This can be very verbose with lots of headers. 2826 Only print at higher debug levels. */ 2827 if (symtab_create_debug >= 2) 2828 { 2829 /* Be a bit clever with debugging messages, and don't print objfile 2830 every time, only when it changes. */ 2831 static char *last_objfile_name = NULL; 2832 2833 if (last_objfile_name == NULL 2834 || strcmp (last_objfile_name, objfile_name (objfile)) != 0) 2835 { 2836 xfree (last_objfile_name); 2837 last_objfile_name = xstrdup (objfile_name (objfile)); 2838 fprintf_filtered (gdb_stdlog, 2839 "Creating one or more symtabs for objfile %s ...\n", 2840 last_objfile_name); 2841 } 2842 fprintf_filtered (gdb_stdlog, 2843 "Created symtab %s for module %s.\n", 2844 host_address_to_string (symtab), filename); 2845 } 2846 2847 /* Add it to CUST's list of symtabs. */ 2848 if (cust->filetabs == NULL) 2849 { 2850 cust->filetabs = symtab; 2851 cust->last_filetab = symtab; 2852 } 2853 else 2854 { 2855 cust->last_filetab->next = symtab; 2856 cust->last_filetab = symtab; 2857 } 2858 2859 /* Backlink to the containing compunit symtab. */ 2860 symtab->compunit_symtab = cust; 2861 2862 return symtab; 2863} 2864 2865/* Allocate and initialize a new compunit. 2866 NAME is the name of the main source file, if there is one, or some 2867 descriptive text if there are no source files. */ 2868 2869struct compunit_symtab * 2870allocate_compunit_symtab (struct objfile *objfile, const char *name) 2871{ 2872 struct compunit_symtab *cu = OBSTACK_ZALLOC (&objfile->objfile_obstack, 2873 struct compunit_symtab); 2874 const char *saved_name; 2875 2876 cu->objfile = objfile; 2877 2878 /* The name we record here is only for display/debugging purposes. 2879 Just save the basename to avoid path issues (too long for display, 2880 relative vs absolute, etc.). */ 2881 saved_name = lbasename (name); 2882 cu->name 2883 = (const char *) obstack_copy0 (&objfile->objfile_obstack, saved_name, 2884 strlen (saved_name)); 2885 2886 COMPUNIT_DEBUGFORMAT (cu) = "unknown"; 2887 2888 if (symtab_create_debug) 2889 { 2890 fprintf_filtered (gdb_stdlog, 2891 "Created compunit symtab %s for %s.\n", 2892 host_address_to_string (cu), 2893 cu->name); 2894 } 2895 2896 return cu; 2897} 2898 2899/* Hook CU to the objfile it comes from. */ 2900 2901void 2902add_compunit_symtab_to_objfile (struct compunit_symtab *cu) 2903{ 2904 cu->next = cu->objfile->compunit_symtabs; 2905 cu->objfile->compunit_symtabs = cu; 2906} 2907 2908 2909/* Reset all data structures in gdb which may contain references to 2910 symbol table data. */ 2911 2912void 2913clear_symtab_users (symfile_add_flags add_flags) 2914{ 2915 /* Someday, we should do better than this, by only blowing away 2916 the things that really need to be blown. */ 2917 2918 /* Clear the "current" symtab first, because it is no longer valid. 2919 breakpoint_re_set may try to access the current symtab. */ 2920 clear_current_source_symtab_and_line (); 2921 2922 clear_displays (); 2923 clear_last_displayed_sal (); 2924 clear_pc_function_cache (); 2925 gdb::observers::new_objfile.notify (NULL); 2926 2927 /* Clear globals which might have pointed into a removed objfile. 2928 FIXME: It's not clear which of these are supposed to persist 2929 between expressions and which ought to be reset each time. */ 2930 expression_context_block = NULL; 2931 innermost_block.reset (); 2932 2933 /* Varobj may refer to old symbols, perform a cleanup. */ 2934 varobj_invalidate (); 2935 2936 /* Now that the various caches have been cleared, we can re_set 2937 our breakpoints without risking it using stale data. */ 2938 if ((add_flags & SYMFILE_DEFER_BP_RESET) == 0) 2939 breakpoint_re_set (); 2940} 2941 2942/* OVERLAYS: 2943 The following code implements an abstraction for debugging overlay sections. 2944 2945 The target model is as follows: 2946 1) The gnu linker will permit multiple sections to be mapped into the 2947 same VMA, each with its own unique LMA (or load address). 2948 2) It is assumed that some runtime mechanism exists for mapping the 2949 sections, one by one, from the load address into the VMA address. 2950 3) This code provides a mechanism for gdb to keep track of which 2951 sections should be considered to be mapped from the VMA to the LMA. 2952 This information is used for symbol lookup, and memory read/write. 2953 For instance, if a section has been mapped then its contents 2954 should be read from the VMA, otherwise from the LMA. 2955 2956 Two levels of debugger support for overlays are available. One is 2957 "manual", in which the debugger relies on the user to tell it which 2958 overlays are currently mapped. This level of support is 2959 implemented entirely in the core debugger, and the information about 2960 whether a section is mapped is kept in the objfile->obj_section table. 2961 2962 The second level of support is "automatic", and is only available if 2963 the target-specific code provides functionality to read the target's 2964 overlay mapping table, and translate its contents for the debugger 2965 (by updating the mapped state information in the obj_section tables). 2966 2967 The interface is as follows: 2968 User commands: 2969 overlay map <name> -- tell gdb to consider this section mapped 2970 overlay unmap <name> -- tell gdb to consider this section unmapped 2971 overlay list -- list the sections that GDB thinks are mapped 2972 overlay read-target -- get the target's state of what's mapped 2973 overlay off/manual/auto -- set overlay debugging state 2974 Functional interface: 2975 find_pc_mapped_section(pc): if the pc is in the range of a mapped 2976 section, return that section. 2977 find_pc_overlay(pc): find any overlay section that contains 2978 the pc, either in its VMA or its LMA 2979 section_is_mapped(sect): true if overlay is marked as mapped 2980 section_is_overlay(sect): true if section's VMA != LMA 2981 pc_in_mapped_range(pc,sec): true if pc belongs to section's VMA 2982 pc_in_unmapped_range(...): true if pc belongs to section's LMA 2983 sections_overlap(sec1, sec2): true if mapped sec1 and sec2 ranges overlap 2984 overlay_mapped_address(...): map an address from section's LMA to VMA 2985 overlay_unmapped_address(...): map an address from section's VMA to LMA 2986 symbol_overlayed_address(...): Return a "current" address for symbol: 2987 either in VMA or LMA depending on whether 2988 the symbol's section is currently mapped. */ 2989 2990/* Overlay debugging state: */ 2991 2992enum overlay_debugging_state overlay_debugging = ovly_off; 2993int overlay_cache_invalid = 0; /* True if need to refresh mapped state. */ 2994 2995/* Function: section_is_overlay (SECTION) 2996 Returns true if SECTION has VMA not equal to LMA, ie. 2997 SECTION is loaded at an address different from where it will "run". */ 2998 2999int 3000section_is_overlay (struct obj_section *section) 3001{ 3002 if (overlay_debugging && section) 3003 { 3004 asection *bfd_section = section->the_bfd_section; 3005 3006 if (bfd_section_lma (abfd, bfd_section) != 0 3007 && bfd_section_lma (abfd, bfd_section) 3008 != bfd_section_vma (abfd, bfd_section)) 3009 return 1; 3010 } 3011 3012 return 0; 3013} 3014 3015/* Function: overlay_invalidate_all (void) 3016 Invalidate the mapped state of all overlay sections (mark it as stale). */ 3017 3018static void 3019overlay_invalidate_all (void) 3020{ 3021 struct obj_section *sect; 3022 3023 for (objfile *objfile : current_program_space->objfiles ()) 3024 ALL_OBJFILE_OSECTIONS (objfile, sect) 3025 if (section_is_overlay (sect)) 3026 sect->ovly_mapped = -1; 3027} 3028 3029/* Function: section_is_mapped (SECTION) 3030 Returns true if section is an overlay, and is currently mapped. 3031 3032 Access to the ovly_mapped flag is restricted to this function, so 3033 that we can do automatic update. If the global flag 3034 OVERLAY_CACHE_INVALID is set (by wait_for_inferior), then call 3035 overlay_invalidate_all. If the mapped state of the particular 3036 section is stale, then call TARGET_OVERLAY_UPDATE to refresh it. */ 3037 3038int 3039section_is_mapped (struct obj_section *osect) 3040{ 3041 struct gdbarch *gdbarch; 3042 3043 if (osect == 0 || !section_is_overlay (osect)) 3044 return 0; 3045 3046 switch (overlay_debugging) 3047 { 3048 default: 3049 case ovly_off: 3050 return 0; /* overlay debugging off */ 3051 case ovly_auto: /* overlay debugging automatic */ 3052 /* Unles there is a gdbarch_overlay_update function, 3053 there's really nothing useful to do here (can't really go auto). */ 3054 gdbarch = get_objfile_arch (osect->objfile); 3055 if (gdbarch_overlay_update_p (gdbarch)) 3056 { 3057 if (overlay_cache_invalid) 3058 { 3059 overlay_invalidate_all (); 3060 overlay_cache_invalid = 0; 3061 } 3062 if (osect->ovly_mapped == -1) 3063 gdbarch_overlay_update (gdbarch, osect); 3064 } 3065 /* fall thru */ 3066 case ovly_on: /* overlay debugging manual */ 3067 return osect->ovly_mapped == 1; 3068 } 3069} 3070 3071/* Function: pc_in_unmapped_range 3072 If PC falls into the lma range of SECTION, return true, else false. */ 3073 3074CORE_ADDR 3075pc_in_unmapped_range (CORE_ADDR pc, struct obj_section *section) 3076{ 3077 if (section_is_overlay (section)) 3078 { 3079 bfd *abfd = section->objfile->obfd; 3080 asection *bfd_section = section->the_bfd_section; 3081 3082 /* We assume the LMA is relocated by the same offset as the VMA. */ 3083 bfd_vma size = bfd_get_section_size (bfd_section); 3084 CORE_ADDR offset = obj_section_offset (section); 3085 3086 if (bfd_get_section_lma (abfd, bfd_section) + offset <= pc 3087 && pc < bfd_get_section_lma (abfd, bfd_section) + offset + size) 3088 return 1; 3089 } 3090 3091 return 0; 3092} 3093 3094/* Function: pc_in_mapped_range 3095 If PC falls into the vma range of SECTION, return true, else false. */ 3096 3097CORE_ADDR 3098pc_in_mapped_range (CORE_ADDR pc, struct obj_section *section) 3099{ 3100 if (section_is_overlay (section)) 3101 { 3102 if (obj_section_addr (section) <= pc 3103 && pc < obj_section_endaddr (section)) 3104 return 1; 3105 } 3106 3107 return 0; 3108} 3109 3110/* Return true if the mapped ranges of sections A and B overlap, false 3111 otherwise. */ 3112 3113static int 3114sections_overlap (struct obj_section *a, struct obj_section *b) 3115{ 3116 CORE_ADDR a_start = obj_section_addr (a); 3117 CORE_ADDR a_end = obj_section_endaddr (a); 3118 CORE_ADDR b_start = obj_section_addr (b); 3119 CORE_ADDR b_end = obj_section_endaddr (b); 3120 3121 return (a_start < b_end && b_start < a_end); 3122} 3123 3124/* Function: overlay_unmapped_address (PC, SECTION) 3125 Returns the address corresponding to PC in the unmapped (load) range. 3126 May be the same as PC. */ 3127 3128CORE_ADDR 3129overlay_unmapped_address (CORE_ADDR pc, struct obj_section *section) 3130{ 3131 if (section_is_overlay (section) && pc_in_mapped_range (pc, section)) 3132 { 3133 asection *bfd_section = section->the_bfd_section; 3134 3135 return pc + bfd_section_lma (abfd, bfd_section) 3136 - bfd_section_vma (abfd, bfd_section); 3137 } 3138 3139 return pc; 3140} 3141 3142/* Function: overlay_mapped_address (PC, SECTION) 3143 Returns the address corresponding to PC in the mapped (runtime) range. 3144 May be the same as PC. */ 3145 3146CORE_ADDR 3147overlay_mapped_address (CORE_ADDR pc, struct obj_section *section) 3148{ 3149 if (section_is_overlay (section) && pc_in_unmapped_range (pc, section)) 3150 { 3151 asection *bfd_section = section->the_bfd_section; 3152 3153 return pc + bfd_section_vma (abfd, bfd_section) 3154 - bfd_section_lma (abfd, bfd_section); 3155 } 3156 3157 return pc; 3158} 3159 3160/* Function: symbol_overlayed_address 3161 Return one of two addresses (relative to the VMA or to the LMA), 3162 depending on whether the section is mapped or not. */ 3163 3164CORE_ADDR 3165symbol_overlayed_address (CORE_ADDR address, struct obj_section *section) 3166{ 3167 if (overlay_debugging) 3168 { 3169 /* If the symbol has no section, just return its regular address. */ 3170 if (section == 0) 3171 return address; 3172 /* If the symbol's section is not an overlay, just return its 3173 address. */ 3174 if (!section_is_overlay (section)) 3175 return address; 3176 /* If the symbol's section is mapped, just return its address. */ 3177 if (section_is_mapped (section)) 3178 return address; 3179 /* 3180 * HOWEVER: if the symbol is in an overlay section which is NOT mapped, 3181 * then return its LOADED address rather than its vma address!! 3182 */ 3183 return overlay_unmapped_address (address, section); 3184 } 3185 return address; 3186} 3187 3188/* Function: find_pc_overlay (PC) 3189 Return the best-match overlay section for PC: 3190 If PC matches a mapped overlay section's VMA, return that section. 3191 Else if PC matches an unmapped section's VMA, return that section. 3192 Else if PC matches an unmapped section's LMA, return that section. */ 3193 3194struct obj_section * 3195find_pc_overlay (CORE_ADDR pc) 3196{ 3197 struct obj_section *osect, *best_match = NULL; 3198 3199 if (overlay_debugging) 3200 { 3201 for (objfile *objfile : current_program_space->objfiles ()) 3202 ALL_OBJFILE_OSECTIONS (objfile, osect) 3203 if (section_is_overlay (osect)) 3204 { 3205 if (pc_in_mapped_range (pc, osect)) 3206 { 3207 if (section_is_mapped (osect)) 3208 return osect; 3209 else 3210 best_match = osect; 3211 } 3212 else if (pc_in_unmapped_range (pc, osect)) 3213 best_match = osect; 3214 } 3215 } 3216 return best_match; 3217} 3218 3219/* Function: find_pc_mapped_section (PC) 3220 If PC falls into the VMA address range of an overlay section that is 3221 currently marked as MAPPED, return that section. Else return NULL. */ 3222 3223struct obj_section * 3224find_pc_mapped_section (CORE_ADDR pc) 3225{ 3226 struct obj_section *osect; 3227 3228 if (overlay_debugging) 3229 { 3230 for (objfile *objfile : current_program_space->objfiles ()) 3231 ALL_OBJFILE_OSECTIONS (objfile, osect) 3232 if (pc_in_mapped_range (pc, osect) && section_is_mapped (osect)) 3233 return osect; 3234 } 3235 3236 return NULL; 3237} 3238 3239/* Function: list_overlays_command 3240 Print a list of mapped sections and their PC ranges. */ 3241 3242static void 3243list_overlays_command (const char *args, int from_tty) 3244{ 3245 int nmapped = 0; 3246 struct obj_section *osect; 3247 3248 if (overlay_debugging) 3249 { 3250 for (objfile *objfile : current_program_space->objfiles ()) 3251 ALL_OBJFILE_OSECTIONS (objfile, osect) 3252 if (section_is_mapped (osect)) 3253 { 3254 struct gdbarch *gdbarch = get_objfile_arch (objfile); 3255 const char *name; 3256 bfd_vma lma, vma; 3257 int size; 3258 3259 vma = bfd_section_vma (objfile->obfd, osect->the_bfd_section); 3260 lma = bfd_section_lma (objfile->obfd, osect->the_bfd_section); 3261 size = bfd_get_section_size (osect->the_bfd_section); 3262 name = bfd_section_name (objfile->obfd, osect->the_bfd_section); 3263 3264 printf_filtered ("Section %s, loaded at ", name); 3265 fputs_filtered (paddress (gdbarch, lma), gdb_stdout); 3266 puts_filtered (" - "); 3267 fputs_filtered (paddress (gdbarch, lma + size), gdb_stdout); 3268 printf_filtered (", mapped at "); 3269 fputs_filtered (paddress (gdbarch, vma), gdb_stdout); 3270 puts_filtered (" - "); 3271 fputs_filtered (paddress (gdbarch, vma + size), gdb_stdout); 3272 puts_filtered ("\n"); 3273 3274 nmapped++; 3275 } 3276 } 3277 if (nmapped == 0) 3278 printf_filtered (_("No sections are mapped.\n")); 3279} 3280 3281/* Function: map_overlay_command 3282 Mark the named section as mapped (ie. residing at its VMA address). */ 3283 3284static void 3285map_overlay_command (const char *args, int from_tty) 3286{ 3287 struct obj_section *sec, *sec2; 3288 3289 if (!overlay_debugging) 3290 error (_("Overlay debugging not enabled. Use " 3291 "either the 'overlay auto' or\n" 3292 "the 'overlay manual' command.")); 3293 3294 if (args == 0 || *args == 0) 3295 error (_("Argument required: name of an overlay section")); 3296 3297 /* First, find a section matching the user supplied argument. */ 3298 for (objfile *obj_file : current_program_space->objfiles ()) 3299 ALL_OBJFILE_OSECTIONS (obj_file, sec) 3300 if (!strcmp (bfd_section_name (obj_file->obfd, sec->the_bfd_section), 3301 args)) 3302 { 3303 /* Now, check to see if the section is an overlay. */ 3304 if (!section_is_overlay (sec)) 3305 continue; /* not an overlay section */ 3306 3307 /* Mark the overlay as "mapped". */ 3308 sec->ovly_mapped = 1; 3309 3310 /* Next, make a pass and unmap any sections that are 3311 overlapped by this new section: */ 3312 for (objfile *objfile2 : current_program_space->objfiles ()) 3313 ALL_OBJFILE_OSECTIONS (objfile2, sec2) 3314 if (sec2->ovly_mapped && sec != sec2 && sections_overlap (sec, 3315 sec2)) 3316 { 3317 if (info_verbose) 3318 printf_unfiltered (_("Note: section %s unmapped by overlap\n"), 3319 bfd_section_name (obj_file->obfd, 3320 sec2->the_bfd_section)); 3321 sec2->ovly_mapped = 0; /* sec2 overlaps sec: unmap sec2. */ 3322 } 3323 return; 3324 } 3325 error (_("No overlay section called %s"), args); 3326} 3327 3328/* Function: unmap_overlay_command 3329 Mark the overlay section as unmapped 3330 (ie. resident in its LMA address range, rather than the VMA range). */ 3331 3332static void 3333unmap_overlay_command (const char *args, int from_tty) 3334{ 3335 struct obj_section *sec = NULL; 3336 3337 if (!overlay_debugging) 3338 error (_("Overlay debugging not enabled. " 3339 "Use either the 'overlay auto' or\n" 3340 "the 'overlay manual' command.")); 3341 3342 if (args == 0 || *args == 0) 3343 error (_("Argument required: name of an overlay section")); 3344 3345 /* First, find a section matching the user supplied argument. */ 3346 for (objfile *objfile : current_program_space->objfiles ()) 3347 ALL_OBJFILE_OSECTIONS (objfile, sec) 3348 if (!strcmp (bfd_section_name (objfile->obfd, sec->the_bfd_section), args)) 3349 { 3350 if (!sec->ovly_mapped) 3351 error (_("Section %s is not mapped"), args); 3352 sec->ovly_mapped = 0; 3353 return; 3354 } 3355 error (_("No overlay section called %s"), args); 3356} 3357 3358/* Function: overlay_auto_command 3359 A utility command to turn on overlay debugging. 3360 Possibly this should be done via a set/show command. */ 3361 3362static void 3363overlay_auto_command (const char *args, int from_tty) 3364{ 3365 overlay_debugging = ovly_auto; 3366 enable_overlay_breakpoints (); 3367 if (info_verbose) 3368 printf_unfiltered (_("Automatic overlay debugging enabled.")); 3369} 3370 3371/* Function: overlay_manual_command 3372 A utility command to turn on overlay debugging. 3373 Possibly this should be done via a set/show command. */ 3374 3375static void 3376overlay_manual_command (const char *args, int from_tty) 3377{ 3378 overlay_debugging = ovly_on; 3379 disable_overlay_breakpoints (); 3380 if (info_verbose) 3381 printf_unfiltered (_("Overlay debugging enabled.")); 3382} 3383 3384/* Function: overlay_off_command 3385 A utility command to turn on overlay debugging. 3386 Possibly this should be done via a set/show command. */ 3387 3388static void 3389overlay_off_command (const char *args, int from_tty) 3390{ 3391 overlay_debugging = ovly_off; 3392 disable_overlay_breakpoints (); 3393 if (info_verbose) 3394 printf_unfiltered (_("Overlay debugging disabled.")); 3395} 3396 3397static void 3398overlay_load_command (const char *args, int from_tty) 3399{ 3400 struct gdbarch *gdbarch = get_current_arch (); 3401 3402 if (gdbarch_overlay_update_p (gdbarch)) 3403 gdbarch_overlay_update (gdbarch, NULL); 3404 else 3405 error (_("This target does not know how to read its overlay state.")); 3406} 3407 3408/* Function: overlay_command 3409 A place-holder for a mis-typed command. */ 3410 3411/* Command list chain containing all defined "overlay" subcommands. */ 3412static struct cmd_list_element *overlaylist; 3413 3414static void 3415overlay_command (const char *args, int from_tty) 3416{ 3417 printf_unfiltered 3418 ("\"overlay\" must be followed by the name of an overlay command.\n"); 3419 help_list (overlaylist, "overlay ", all_commands, gdb_stdout); 3420} 3421 3422/* Target Overlays for the "Simplest" overlay manager: 3423 3424 This is GDB's default target overlay layer. It works with the 3425 minimal overlay manager supplied as an example by Cygnus. The 3426 entry point is via a function pointer "gdbarch_overlay_update", 3427 so targets that use a different runtime overlay manager can 3428 substitute their own overlay_update function and take over the 3429 function pointer. 3430 3431 The overlay_update function pokes around in the target's data structures 3432 to see what overlays are mapped, and updates GDB's overlay mapping with 3433 this information. 3434 3435 In this simple implementation, the target data structures are as follows: 3436 unsigned _novlys; /# number of overlay sections #/ 3437 unsigned _ovly_table[_novlys][4] = { 3438 {VMA, OSIZE, LMA, MAPPED}, /# one entry per overlay section #/ 3439 {..., ..., ..., ...}, 3440 } 3441 unsigned _novly_regions; /# number of overlay regions #/ 3442 unsigned _ovly_region_table[_novly_regions][3] = { 3443 {VMA, OSIZE, MAPPED_TO_LMA}, /# one entry per overlay region #/ 3444 {..., ..., ...}, 3445 } 3446 These functions will attempt to update GDB's mappedness state in the 3447 symbol section table, based on the target's mappedness state. 3448 3449 To do this, we keep a cached copy of the target's _ovly_table, and 3450 attempt to detect when the cached copy is invalidated. The main 3451 entry point is "simple_overlay_update(SECT), which looks up SECT in 3452 the cached table and re-reads only the entry for that section from 3453 the target (whenever possible). */ 3454 3455/* Cached, dynamically allocated copies of the target data structures: */ 3456static unsigned (*cache_ovly_table)[4] = 0; 3457static unsigned cache_novlys = 0; 3458static CORE_ADDR cache_ovly_table_base = 0; 3459enum ovly_index 3460 { 3461 VMA, OSIZE, LMA, MAPPED 3462 }; 3463 3464/* Throw away the cached copy of _ovly_table. */ 3465 3466static void 3467simple_free_overlay_table (void) 3468{ 3469 if (cache_ovly_table) 3470 xfree (cache_ovly_table); 3471 cache_novlys = 0; 3472 cache_ovly_table = NULL; 3473 cache_ovly_table_base = 0; 3474} 3475 3476/* Read an array of ints of size SIZE from the target into a local buffer. 3477 Convert to host order. int LEN is number of ints. */ 3478 3479static void 3480read_target_long_array (CORE_ADDR memaddr, unsigned int *myaddr, 3481 int len, int size, enum bfd_endian byte_order) 3482{ 3483 /* FIXME (alloca): Not safe if array is very large. */ 3484 gdb_byte *buf = (gdb_byte *) alloca (len * size); 3485 int i; 3486 3487 read_memory (memaddr, buf, len * size); 3488 for (i = 0; i < len; i++) 3489 myaddr[i] = extract_unsigned_integer (size * i + buf, size, byte_order); 3490} 3491 3492/* Find and grab a copy of the target _ovly_table 3493 (and _novlys, which is needed for the table's size). */ 3494 3495static int 3496simple_read_overlay_table (void) 3497{ 3498 struct bound_minimal_symbol novlys_msym; 3499 struct bound_minimal_symbol ovly_table_msym; 3500 struct gdbarch *gdbarch; 3501 int word_size; 3502 enum bfd_endian byte_order; 3503 3504 simple_free_overlay_table (); 3505 novlys_msym = lookup_minimal_symbol ("_novlys", NULL, NULL); 3506 if (! novlys_msym.minsym) 3507 { 3508 error (_("Error reading inferior's overlay table: " 3509 "couldn't find `_novlys' variable\n" 3510 "in inferior. Use `overlay manual' mode.")); 3511 return 0; 3512 } 3513 3514 ovly_table_msym = lookup_bound_minimal_symbol ("_ovly_table"); 3515 if (! ovly_table_msym.minsym) 3516 { 3517 error (_("Error reading inferior's overlay table: couldn't find " 3518 "`_ovly_table' array\n" 3519 "in inferior. Use `overlay manual' mode.")); 3520 return 0; 3521 } 3522 3523 gdbarch = get_objfile_arch (ovly_table_msym.objfile); 3524 word_size = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT; 3525 byte_order = gdbarch_byte_order (gdbarch); 3526 3527 cache_novlys = read_memory_integer (BMSYMBOL_VALUE_ADDRESS (novlys_msym), 3528 4, byte_order); 3529 cache_ovly_table 3530 = (unsigned int (*)[4]) xmalloc (cache_novlys * sizeof (*cache_ovly_table)); 3531 cache_ovly_table_base = BMSYMBOL_VALUE_ADDRESS (ovly_table_msym); 3532 read_target_long_array (cache_ovly_table_base, 3533 (unsigned int *) cache_ovly_table, 3534 cache_novlys * 4, word_size, byte_order); 3535 3536 return 1; /* SUCCESS */ 3537} 3538 3539/* Function: simple_overlay_update_1 3540 A helper function for simple_overlay_update. Assuming a cached copy 3541 of _ovly_table exists, look through it to find an entry whose vma, 3542 lma and size match those of OSECT. Re-read the entry and make sure 3543 it still matches OSECT (else the table may no longer be valid). 3544 Set OSECT's mapped state to match the entry. Return: 1 for 3545 success, 0 for failure. */ 3546 3547static int 3548simple_overlay_update_1 (struct obj_section *osect) 3549{ 3550 int i; 3551 asection *bsect = osect->the_bfd_section; 3552 struct gdbarch *gdbarch = get_objfile_arch (osect->objfile); 3553 int word_size = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT; 3554 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); 3555 3556 for (i = 0; i < cache_novlys; i++) 3557 if (cache_ovly_table[i][VMA] == bfd_section_vma (obfd, bsect) 3558 && cache_ovly_table[i][LMA] == bfd_section_lma (obfd, bsect)) 3559 { 3560 read_target_long_array (cache_ovly_table_base + i * word_size, 3561 (unsigned int *) cache_ovly_table[i], 3562 4, word_size, byte_order); 3563 if (cache_ovly_table[i][VMA] == bfd_section_vma (obfd, bsect) 3564 && cache_ovly_table[i][LMA] == bfd_section_lma (obfd, bsect)) 3565 { 3566 osect->ovly_mapped = cache_ovly_table[i][MAPPED]; 3567 return 1; 3568 } 3569 else /* Warning! Warning! Target's ovly table has changed! */ 3570 return 0; 3571 } 3572 return 0; 3573} 3574 3575/* Function: simple_overlay_update 3576 If OSECT is NULL, then update all sections' mapped state 3577 (after re-reading the entire target _ovly_table). 3578 If OSECT is non-NULL, then try to find a matching entry in the 3579 cached ovly_table and update only OSECT's mapped state. 3580 If a cached entry can't be found or the cache isn't valid, then 3581 re-read the entire cache, and go ahead and update all sections. */ 3582 3583void 3584simple_overlay_update (struct obj_section *osect) 3585{ 3586 /* Were we given an osect to look up? NULL means do all of them. */ 3587 if (osect) 3588 /* Have we got a cached copy of the target's overlay table? */ 3589 if (cache_ovly_table != NULL) 3590 { 3591 /* Does its cached location match what's currently in the 3592 symtab? */ 3593 struct bound_minimal_symbol minsym 3594 = lookup_minimal_symbol ("_ovly_table", NULL, NULL); 3595 3596 if (minsym.minsym == NULL) 3597 error (_("Error reading inferior's overlay table: couldn't " 3598 "find `_ovly_table' array\n" 3599 "in inferior. Use `overlay manual' mode.")); 3600 3601 if (cache_ovly_table_base == BMSYMBOL_VALUE_ADDRESS (minsym)) 3602 /* Then go ahead and try to look up this single section in 3603 the cache. */ 3604 if (simple_overlay_update_1 (osect)) 3605 /* Found it! We're done. */ 3606 return; 3607 } 3608 3609 /* Cached table no good: need to read the entire table anew. 3610 Or else we want all the sections, in which case it's actually 3611 more efficient to read the whole table in one block anyway. */ 3612 3613 if (! simple_read_overlay_table ()) 3614 return; 3615 3616 /* Now may as well update all sections, even if only one was requested. */ 3617 for (objfile *objfile : current_program_space->objfiles ()) 3618 ALL_OBJFILE_OSECTIONS (objfile, osect) 3619 if (section_is_overlay (osect)) 3620 { 3621 int i; 3622 asection *bsect = osect->the_bfd_section; 3623 3624 for (i = 0; i < cache_novlys; i++) 3625 if (cache_ovly_table[i][VMA] == bfd_section_vma (obfd, bsect) 3626 && cache_ovly_table[i][LMA] == bfd_section_lma (obfd, bsect)) 3627 { /* obj_section matches i'th entry in ovly_table. */ 3628 osect->ovly_mapped = cache_ovly_table[i][MAPPED]; 3629 break; /* finished with inner for loop: break out. */ 3630 } 3631 } 3632} 3633 3634/* Set the output sections and output offsets for section SECTP in 3635 ABFD. The relocation code in BFD will read these offsets, so we 3636 need to be sure they're initialized. We map each section to itself, 3637 with no offset; this means that SECTP->vma will be honored. */ 3638 3639static void 3640symfile_dummy_outputs (bfd *abfd, asection *sectp, void *dummy) 3641{ 3642 sectp->output_section = sectp; 3643 sectp->output_offset = 0; 3644} 3645 3646/* Default implementation for sym_relocate. */ 3647 3648bfd_byte * 3649default_symfile_relocate (struct objfile *objfile, asection *sectp, 3650 bfd_byte *buf) 3651{ 3652 /* Use sectp->owner instead of objfile->obfd. sectp may point to a 3653 DWO file. */ 3654 bfd *abfd = sectp->owner; 3655 3656 /* We're only interested in sections with relocation 3657 information. */ 3658 if ((sectp->flags & SEC_RELOC) == 0) 3659 return NULL; 3660 3661 /* We will handle section offsets properly elsewhere, so relocate as if 3662 all sections begin at 0. */ 3663 bfd_map_over_sections (abfd, symfile_dummy_outputs, NULL); 3664 3665 return bfd_simple_get_relocated_section_contents (abfd, sectp, buf, NULL); 3666} 3667 3668/* Relocate the contents of a debug section SECTP in ABFD. The 3669 contents are stored in BUF if it is non-NULL, or returned in a 3670 malloc'd buffer otherwise. 3671 3672 For some platforms and debug info formats, shared libraries contain 3673 relocations against the debug sections (particularly for DWARF-2; 3674 one affected platform is PowerPC GNU/Linux, although it depends on 3675 the version of the linker in use). Also, ELF object files naturally 3676 have unresolved relocations for their debug sections. We need to apply 3677 the relocations in order to get the locations of symbols correct. 3678 Another example that may require relocation processing, is the 3679 DWARF-2 .eh_frame section in .o files, although it isn't strictly a 3680 debug section. */ 3681 3682bfd_byte * 3683symfile_relocate_debug_section (struct objfile *objfile, 3684 asection *sectp, bfd_byte *buf) 3685{ 3686 gdb_assert (objfile->sf->sym_relocate); 3687 3688 return (*objfile->sf->sym_relocate) (objfile, sectp, buf); 3689} 3690 3691struct symfile_segment_data * 3692get_symfile_segment_data (bfd *abfd) 3693{ 3694 const struct sym_fns *sf = find_sym_fns (abfd); 3695 3696 if (sf == NULL) 3697 return NULL; 3698 3699 return sf->sym_segments (abfd); 3700} 3701 3702void 3703free_symfile_segment_data (struct symfile_segment_data *data) 3704{ 3705 xfree (data->segment_bases); 3706 xfree (data->segment_sizes); 3707 xfree (data->segment_info); 3708 xfree (data); 3709} 3710 3711/* Given: 3712 - DATA, containing segment addresses from the object file ABFD, and 3713 the mapping from ABFD's sections onto the segments that own them, 3714 and 3715 - SEGMENT_BASES[0 .. NUM_SEGMENT_BASES - 1], holding the actual 3716 segment addresses reported by the target, 3717 store the appropriate offsets for each section in OFFSETS. 3718 3719 If there are fewer entries in SEGMENT_BASES than there are segments 3720 in DATA, then apply SEGMENT_BASES' last entry to all the segments. 3721 3722 If there are more entries, then ignore the extra. The target may 3723 not be able to distinguish between an empty data segment and a 3724 missing data segment; a missing text segment is less plausible. */ 3725 3726int 3727symfile_map_offsets_to_segments (bfd *abfd, 3728 const struct symfile_segment_data *data, 3729 struct section_offsets *offsets, 3730 int num_segment_bases, 3731 const CORE_ADDR *segment_bases) 3732{ 3733 int i; 3734 asection *sect; 3735 3736 /* It doesn't make sense to call this function unless you have some 3737 segment base addresses. */ 3738 gdb_assert (num_segment_bases > 0); 3739 3740 /* If we do not have segment mappings for the object file, we 3741 can not relocate it by segments. */ 3742 gdb_assert (data != NULL); 3743 gdb_assert (data->num_segments > 0); 3744 3745 for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next) 3746 { 3747 int which = data->segment_info[i]; 3748 3749 gdb_assert (0 <= which && which <= data->num_segments); 3750 3751 /* Don't bother computing offsets for sections that aren't 3752 loaded as part of any segment. */ 3753 if (! which) 3754 continue; 3755 3756 /* Use the last SEGMENT_BASES entry as the address of any extra 3757 segments mentioned in DATA->segment_info. */ 3758 if (which > num_segment_bases) 3759 which = num_segment_bases; 3760 3761 offsets->offsets[i] = (segment_bases[which - 1] 3762 - data->segment_bases[which - 1]); 3763 } 3764 3765 return 1; 3766} 3767 3768static void 3769symfile_find_segment_sections (struct objfile *objfile) 3770{ 3771 bfd *abfd = objfile->obfd; 3772 int i; 3773 asection *sect; 3774 struct symfile_segment_data *data; 3775 3776 data = get_symfile_segment_data (objfile->obfd); 3777 if (data == NULL) 3778 return; 3779 3780 if (data->num_segments != 1 && data->num_segments != 2) 3781 { 3782 free_symfile_segment_data (data); 3783 return; 3784 } 3785 3786 for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next) 3787 { 3788 int which = data->segment_info[i]; 3789 3790 if (which == 1) 3791 { 3792 if (objfile->sect_index_text == -1) 3793 objfile->sect_index_text = sect->index; 3794 3795 if (objfile->sect_index_rodata == -1) 3796 objfile->sect_index_rodata = sect->index; 3797 } 3798 else if (which == 2) 3799 { 3800 if (objfile->sect_index_data == -1) 3801 objfile->sect_index_data = sect->index; 3802 3803 if (objfile->sect_index_bss == -1) 3804 objfile->sect_index_bss = sect->index; 3805 } 3806 } 3807 3808 free_symfile_segment_data (data); 3809} 3810 3811/* Listen for free_objfile events. */ 3812 3813static void 3814symfile_free_objfile (struct objfile *objfile) 3815{ 3816 /* Remove the target sections owned by this objfile. */ 3817 if (objfile != NULL) 3818 remove_target_sections ((void *) objfile); 3819} 3820 3821/* Wrapper around the quick_symbol_functions expand_symtabs_matching "method". 3822 Expand all symtabs that match the specified criteria. 3823 See quick_symbol_functions.expand_symtabs_matching for details. */ 3824 3825void 3826expand_symtabs_matching 3827 (gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher, 3828 const lookup_name_info &lookup_name, 3829 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher, 3830 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify, 3831 enum search_domain kind) 3832{ 3833 for (objfile *objfile : current_program_space->objfiles ()) 3834 { 3835 if (objfile->sf) 3836 objfile->sf->qf->expand_symtabs_matching (objfile, file_matcher, 3837 lookup_name, 3838 symbol_matcher, 3839 expansion_notify, kind); 3840 } 3841} 3842 3843/* Wrapper around the quick_symbol_functions map_symbol_filenames "method". 3844 Map function FUN over every file. 3845 See quick_symbol_functions.map_symbol_filenames for details. */ 3846 3847void 3848map_symbol_filenames (symbol_filename_ftype *fun, void *data, 3849 int need_fullname) 3850{ 3851 for (objfile *objfile : current_program_space->objfiles ()) 3852 { 3853 if (objfile->sf) 3854 objfile->sf->qf->map_symbol_filenames (objfile, fun, data, 3855 need_fullname); 3856 } 3857} 3858 3859#if GDB_SELF_TEST 3860 3861namespace selftests { 3862namespace filename_language { 3863 3864static void test_filename_language () 3865{ 3866 /* This test messes up the filename_language_table global. */ 3867 scoped_restore restore_flt = make_scoped_restore (&filename_language_table); 3868 3869 /* Test deducing an unknown extension. */ 3870 language lang = deduce_language_from_filename ("myfile.blah"); 3871 SELF_CHECK (lang == language_unknown); 3872 3873 /* Test deducing a known extension. */ 3874 lang = deduce_language_from_filename ("myfile.c"); 3875 SELF_CHECK (lang == language_c); 3876 3877 /* Test adding a new extension using the internal API. */ 3878 add_filename_language (".blah", language_pascal); 3879 lang = deduce_language_from_filename ("myfile.blah"); 3880 SELF_CHECK (lang == language_pascal); 3881} 3882 3883static void 3884test_set_ext_lang_command () 3885{ 3886 /* This test messes up the filename_language_table global. */ 3887 scoped_restore restore_flt = make_scoped_restore (&filename_language_table); 3888 3889 /* Confirm that the .hello extension is not known. */ 3890 language lang = deduce_language_from_filename ("cake.hello"); 3891 SELF_CHECK (lang == language_unknown); 3892 3893 /* Test adding a new extension using the CLI command. */ 3894 gdb::unique_xmalloc_ptr<char> args_holder (xstrdup (".hello rust")); 3895 ext_args = args_holder.get (); 3896 set_ext_lang_command (NULL, 1, NULL); 3897 3898 lang = deduce_language_from_filename ("cake.hello"); 3899 SELF_CHECK (lang == language_rust); 3900 3901 /* Test overriding an existing extension using the CLI command. */ 3902 int size_before = filename_language_table.size (); 3903 args_holder.reset (xstrdup (".hello pascal")); 3904 ext_args = args_holder.get (); 3905 set_ext_lang_command (NULL, 1, NULL); 3906 int size_after = filename_language_table.size (); 3907 3908 lang = deduce_language_from_filename ("cake.hello"); 3909 SELF_CHECK (lang == language_pascal); 3910 SELF_CHECK (size_before == size_after); 3911} 3912 3913} /* namespace filename_language */ 3914} /* namespace selftests */ 3915 3916#endif /* GDB_SELF_TEST */ 3917 3918void 3919_initialize_symfile (void) 3920{ 3921 struct cmd_list_element *c; 3922 3923 gdb::observers::free_objfile.attach (symfile_free_objfile); 3924 3925#define READNOW_READNEVER_HELP \ 3926 "The '-readnow' option will cause GDB to read the entire symbol file\n\ 3927immediately. This makes the command slower, but may make future operations\n\ 3928faster.\n\ 3929The '-readnever' option will prevent GDB from reading the symbol file's\n\ 3930symbolic debug information." 3931 3932 c = add_cmd ("symbol-file", class_files, symbol_file_command, _("\ 3933Load symbol table from executable file FILE.\n\ 3934Usage: symbol-file [-readnow | -readnever] [-o OFF] FILE\n\ 3935OFF is an optional offset which is added to each section address.\n\ 3936The `file' command can also load symbol tables, as well as setting the file\n\ 3937to execute.\n" READNOW_READNEVER_HELP), &cmdlist); 3938 set_cmd_completer (c, filename_completer); 3939 3940 c = add_cmd ("add-symbol-file", class_files, add_symbol_file_command, _("\ 3941Load symbols from FILE, assuming FILE has been dynamically loaded.\n\ 3942Usage: add-symbol-file FILE [-readnow | -readnever] [-o OFF] [ADDR] \ 3943[-s SECT-NAME SECT-ADDR]...\n\ 3944ADDR is the starting address of the file's text.\n\ 3945Each '-s' argument provides a section name and address, and\n\ 3946should be specified if the data and bss segments are not contiguous\n\ 3947with the text. SECT-NAME is a section name to be loaded at SECT-ADDR.\n\ 3948OFF is an optional offset which is added to the default load addresses\n\ 3949of all sections for which no other address was specified.\n" 3950READNOW_READNEVER_HELP), 3951 &cmdlist); 3952 set_cmd_completer (c, filename_completer); 3953 3954 c = add_cmd ("remove-symbol-file", class_files, 3955 remove_symbol_file_command, _("\ 3956Remove a symbol file added via the add-symbol-file command.\n\ 3957Usage: remove-symbol-file FILENAME\n\ 3958 remove-symbol-file -a ADDRESS\n\ 3959The file to remove can be identified by its filename or by an address\n\ 3960that lies within the boundaries of this symbol file in memory."), 3961 &cmdlist); 3962 3963 c = add_cmd ("load", class_files, load_command, _("\ 3964Dynamically load FILE into the running program, and record its symbols\n\ 3965for access from GDB.\n\ 3966Usage: load [FILE] [OFFSET]\n\ 3967An optional load OFFSET may also be given as a literal address.\n\ 3968When OFFSET is provided, FILE must also be provided. FILE can be provided\n\ 3969on its own."), &cmdlist); 3970 set_cmd_completer (c, filename_completer); 3971 3972 add_prefix_cmd ("overlay", class_support, overlay_command, 3973 _("Commands for debugging overlays."), &overlaylist, 3974 "overlay ", 0, &cmdlist); 3975 3976 add_com_alias ("ovly", "overlay", class_alias, 1); 3977 add_com_alias ("ov", "overlay", class_alias, 1); 3978 3979 add_cmd ("map-overlay", class_support, map_overlay_command, 3980 _("Assert that an overlay section is mapped."), &overlaylist); 3981 3982 add_cmd ("unmap-overlay", class_support, unmap_overlay_command, 3983 _("Assert that an overlay section is unmapped."), &overlaylist); 3984 3985 add_cmd ("list-overlays", class_support, list_overlays_command, 3986 _("List mappings of overlay sections."), &overlaylist); 3987 3988 add_cmd ("manual", class_support, overlay_manual_command, 3989 _("Enable overlay debugging."), &overlaylist); 3990 add_cmd ("off", class_support, overlay_off_command, 3991 _("Disable overlay debugging."), &overlaylist); 3992 add_cmd ("auto", class_support, overlay_auto_command, 3993 _("Enable automatic overlay debugging."), &overlaylist); 3994 add_cmd ("load-target", class_support, overlay_load_command, 3995 _("Read the overlay mapping state from the target."), &overlaylist); 3996 3997 /* Filename extension to source language lookup table: */ 3998 add_setshow_string_noescape_cmd ("extension-language", class_files, 3999 &ext_args, _("\ 4000Set mapping between filename extension and source language."), _("\ 4001Show mapping between filename extension and source language."), _("\ 4002Usage: set extension-language .foo bar"), 4003 set_ext_lang_command, 4004 show_ext_args, 4005 &setlist, &showlist); 4006 4007 add_info ("extensions", info_ext_lang_command, 4008 _("All filename extensions associated with a source language.")); 4009 4010 add_setshow_optional_filename_cmd ("debug-file-directory", class_support, 4011 &debug_file_directory, _("\ 4012Set the directories where separate debug symbols are searched for."), _("\ 4013Show the directories where separate debug symbols are searched for."), _("\ 4014Separate debug symbols are first searched for in the same\n\ 4015directory as the binary, then in the `" DEBUG_SUBDIRECTORY "' subdirectory,\n\ 4016and lastly at the path of the directory of the binary with\n\ 4017each global debug-file-directory component prepended."), 4018 NULL, 4019 show_debug_file_directory, 4020 &setlist, &showlist); 4021 4022 add_setshow_enum_cmd ("symbol-loading", no_class, 4023 print_symbol_loading_enums, &print_symbol_loading, 4024 _("\ 4025Set printing of symbol loading messages."), _("\ 4026Show printing of symbol loading messages."), _("\ 4027off == turn all messages off\n\ 4028brief == print messages for the executable,\n\ 4029 and brief messages for shared libraries\n\ 4030full == print messages for the executable,\n\ 4031 and messages for each shared library."), 4032 NULL, 4033 NULL, 4034 &setprintlist, &showprintlist); 4035 4036 add_setshow_boolean_cmd ("separate-debug-file", no_class, 4037 &separate_debug_file_debug, _("\ 4038Set printing of separate debug info file search debug."), _("\ 4039Show printing of separate debug info file search debug."), _("\ 4040When on, GDB prints the searched locations while looking for separate debug \ 4041info files."), NULL, NULL, &setdebuglist, &showdebuglist); 4042 4043#if GDB_SELF_TEST 4044 selftests::register_test 4045 ("filename_language", selftests::filename_language::test_filename_language); 4046 selftests::register_test 4047 ("set_ext_lang_command", 4048 selftests::filename_language::test_set_ext_lang_command); 4049#endif 4050} 4051