1/* Generic symbol file reading for the GNU debugger, GDB. 2 3 Copyright (C) 1990-2020 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/tilde.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 "gdbsupport/byte-vector.h" 60#include "gdbsupport/pathstuff.h" 61#include "gdbsupport/selftest.h" 62#include "cli/cli-style.h" 63#include "gdbsupport/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/* See symfile.h. */ 145 146bool auto_solib_add = true; 147 148 149/* Return non-zero if symbol-loading messages should be printed. 150 FROM_TTY is the standard from_tty argument to gdb commands. 151 If EXEC is non-zero the messages are for the executable. 152 Otherwise, messages are for shared libraries. 153 If FULL is non-zero then the caller is printing a detailed message. 154 E.g., the message includes the shared library name. 155 Otherwise, the caller is printing a brief "summary" message. */ 156 157int 158print_symbol_loading_p (int from_tty, int exec, int full) 159{ 160 if (!from_tty && !info_verbose) 161 return 0; 162 163 if (exec) 164 { 165 /* We don't check FULL for executables, there are few such 166 messages, therefore brief == full. */ 167 return print_symbol_loading != print_symbol_loading_off; 168 } 169 if (full) 170 return print_symbol_loading == print_symbol_loading_full; 171 return print_symbol_loading == print_symbol_loading_brief; 172} 173 174/* True if we are reading a symbol table. */ 175 176int currently_reading_symtab = 0; 177 178/* Increment currently_reading_symtab and return a cleanup that can be 179 used to decrement it. */ 180 181scoped_restore_tmpl<int> 182increment_reading_symtab (void) 183{ 184 gdb_assert (currently_reading_symtab >= 0); 185 return make_scoped_restore (¤tly_reading_symtab, 186 currently_reading_symtab + 1); 187} 188 189/* Remember the lowest-addressed loadable section we've seen. 190 This function is called via bfd_map_over_sections. 191 192 In case of equal vmas, the section with the largest size becomes the 193 lowest-addressed loadable section. 194 195 If the vmas and sizes are equal, the last section is considered the 196 lowest-addressed loadable section. */ 197 198void 199find_lowest_section (bfd *abfd, asection *sect, void *obj) 200{ 201 asection **lowest = (asection **) obj; 202 203 if (0 == (bfd_section_flags (sect) & (SEC_ALLOC | SEC_LOAD))) 204 return; 205 if (!*lowest) 206 *lowest = sect; /* First loadable section */ 207 else if (bfd_section_vma (*lowest) > bfd_section_vma (sect)) 208 *lowest = sect; /* A lower loadable section */ 209 else if (bfd_section_vma (*lowest) == bfd_section_vma (sect) 210 && (bfd_section_size (*lowest) <= bfd_section_size (sect))) 211 *lowest = sect; 212} 213 214/* Build (allocate and populate) a section_addr_info struct from 215 an existing section table. */ 216 217section_addr_info 218build_section_addr_info_from_section_table (const struct target_section *start, 219 const struct target_section *end) 220{ 221 const struct target_section *stp; 222 223 section_addr_info sap; 224 225 for (stp = start; stp != end; stp++) 226 { 227 struct bfd_section *asect = stp->the_bfd_section; 228 bfd *abfd = asect->owner; 229 230 if (bfd_section_flags (asect) & (SEC_ALLOC | SEC_LOAD) 231 && sap.size () < end - start) 232 sap.emplace_back (stp->addr, 233 bfd_section_name (asect), 234 gdb_bfd_section_index (abfd, asect)); 235 } 236 237 return sap; 238} 239 240/* Create a section_addr_info from section offsets in ABFD. */ 241 242static section_addr_info 243build_section_addr_info_from_bfd (bfd *abfd) 244{ 245 struct bfd_section *sec; 246 247 section_addr_info sap; 248 for (sec = abfd->sections; sec != NULL; sec = sec->next) 249 if (bfd_section_flags (sec) & (SEC_ALLOC | SEC_LOAD)) 250 sap.emplace_back (bfd_section_vma (sec), 251 bfd_section_name (sec), 252 gdb_bfd_section_index (abfd, sec)); 253 254 return sap; 255} 256 257/* Create a section_addr_info from section offsets in OBJFILE. */ 258 259section_addr_info 260build_section_addr_info_from_objfile (const struct objfile *objfile) 261{ 262 int i; 263 264 /* Before reread_symbols gets rewritten it is not safe to call: 265 gdb_assert (objfile->num_sections == bfd_count_sections (objfile->obfd)); 266 */ 267 section_addr_info sap = build_section_addr_info_from_bfd (objfile->obfd); 268 for (i = 0; i < sap.size (); i++) 269 { 270 int sectindex = sap[i].sectindex; 271 272 sap[i].addr += objfile->section_offsets[sectindex]; 273 } 274 return sap; 275} 276 277/* Initialize OBJFILE's sect_index_* members. */ 278 279static void 280init_objfile_sect_indices (struct objfile *objfile) 281{ 282 asection *sect; 283 int i; 284 285 sect = bfd_get_section_by_name (objfile->obfd, ".text"); 286 if (sect) 287 objfile->sect_index_text = sect->index; 288 289 sect = bfd_get_section_by_name (objfile->obfd, ".data"); 290 if (sect) 291 objfile->sect_index_data = sect->index; 292 293 sect = bfd_get_section_by_name (objfile->obfd, ".bss"); 294 if (sect) 295 objfile->sect_index_bss = sect->index; 296 297 sect = bfd_get_section_by_name (objfile->obfd, ".rodata"); 298 if (sect) 299 objfile->sect_index_rodata = sect->index; 300 301 /* This is where things get really weird... We MUST have valid 302 indices for the various sect_index_* members or gdb will abort. 303 So if for example, there is no ".text" section, we have to 304 accomodate that. First, check for a file with the standard 305 one or two segments. */ 306 307 symfile_find_segment_sections (objfile); 308 309 /* Except when explicitly adding symbol files at some address, 310 section_offsets contains nothing but zeros, so it doesn't matter 311 which slot in section_offsets the individual sect_index_* members 312 index into. So if they are all zero, it is safe to just point 313 all the currently uninitialized indices to the first slot. But 314 beware: if this is the main executable, it may be relocated 315 later, e.g. by the remote qOffsets packet, and then this will 316 be wrong! That's why we try segments first. */ 317 318 for (i = 0; i < objfile->section_offsets.size (); i++) 319 { 320 if (objfile->section_offsets[i] != 0) 321 { 322 break; 323 } 324 } 325 if (i == objfile->section_offsets.size ()) 326 { 327 if (objfile->sect_index_text == -1) 328 objfile->sect_index_text = 0; 329 if (objfile->sect_index_data == -1) 330 objfile->sect_index_data = 0; 331 if (objfile->sect_index_bss == -1) 332 objfile->sect_index_bss = 0; 333 if (objfile->sect_index_rodata == -1) 334 objfile->sect_index_rodata = 0; 335 } 336} 337 338/* The arguments to place_section. */ 339 340struct place_section_arg 341{ 342 section_offsets *offsets; 343 CORE_ADDR lowest; 344}; 345 346/* Find a unique offset to use for loadable section SECT if 347 the user did not provide an offset. */ 348 349static void 350place_section (bfd *abfd, asection *sect, void *obj) 351{ 352 struct place_section_arg *arg = (struct place_section_arg *) obj; 353 section_offsets &offsets = *arg->offsets; 354 CORE_ADDR start_addr; 355 int done; 356 ULONGEST align = ((ULONGEST) 1) << bfd_section_alignment (sect); 357 358 /* We are only interested in allocated sections. */ 359 if ((bfd_section_flags (sect) & SEC_ALLOC) == 0) 360 return; 361 362 /* If the user specified an offset, honor it. */ 363 if (offsets[gdb_bfd_section_index (abfd, sect)] != 0) 364 return; 365 366 /* Otherwise, let's try to find a place for the section. */ 367 start_addr = (arg->lowest + align - 1) & -align; 368 369 do { 370 asection *cur_sec; 371 372 done = 1; 373 374 for (cur_sec = abfd->sections; cur_sec != NULL; cur_sec = cur_sec->next) 375 { 376 int indx = cur_sec->index; 377 378 /* We don't need to compare against ourself. */ 379 if (cur_sec == sect) 380 continue; 381 382 /* We can only conflict with allocated sections. */ 383 if ((bfd_section_flags (cur_sec) & SEC_ALLOC) == 0) 384 continue; 385 386 /* If the section offset is 0, either the section has not been placed 387 yet, or it was the lowest section placed (in which case LOWEST 388 will be past its end). */ 389 if (offsets[indx] == 0) 390 continue; 391 392 /* If this section would overlap us, then we must move up. */ 393 if (start_addr + bfd_section_size (sect) > offsets[indx] 394 && start_addr < offsets[indx] + bfd_section_size (cur_sec)) 395 { 396 start_addr = offsets[indx] + bfd_section_size (cur_sec); 397 start_addr = (start_addr + align - 1) & -align; 398 done = 0; 399 break; 400 } 401 402 /* Otherwise, we appear to be OK. So far. */ 403 } 404 } 405 while (!done); 406 407 offsets[gdb_bfd_section_index (abfd, sect)] = start_addr; 408 arg->lowest = start_addr + bfd_section_size (sect); 409} 410 411/* Store section_addr_info as prepared (made relative and with SECTINDEX 412 filled-in) by addr_info_make_relative into SECTION_OFFSETS. */ 413 414void 415relative_addr_info_to_section_offsets (section_offsets §ion_offsets, 416 const section_addr_info &addrs) 417{ 418 int i; 419 420 section_offsets.assign (section_offsets.size (), 0); 421 422 /* Now calculate offsets for section that were specified by the caller. */ 423 for (i = 0; i < addrs.size (); i++) 424 { 425 const struct other_sections *osp; 426 427 osp = &addrs[i]; 428 if (osp->sectindex == -1) 429 continue; 430 431 /* Record all sections in offsets. */ 432 /* The section_offsets in the objfile are here filled in using 433 the BFD index. */ 434 section_offsets[osp->sectindex] = osp->addr; 435 } 436} 437 438/* Transform section name S for a name comparison. prelink can split section 439 `.bss' into two sections `.dynbss' and `.bss' (in this order). Similarly 440 prelink can split `.sbss' into `.sdynbss' and `.sbss'. Use virtual address 441 of the new `.dynbss' (`.sdynbss') section as the adjacent new `.bss' 442 (`.sbss') section has invalid (increased) virtual address. */ 443 444static const char * 445addr_section_name (const char *s) 446{ 447 if (strcmp (s, ".dynbss") == 0) 448 return ".bss"; 449 if (strcmp (s, ".sdynbss") == 0) 450 return ".sbss"; 451 452 return s; 453} 454 455/* std::sort comparator for addrs_section_sort. Sort entries in 456 ascending order by their (name, sectindex) pair. sectindex makes 457 the sort by name stable. */ 458 459static bool 460addrs_section_compar (const struct other_sections *a, 461 const struct other_sections *b) 462{ 463 int retval; 464 465 retval = strcmp (addr_section_name (a->name.c_str ()), 466 addr_section_name (b->name.c_str ())); 467 if (retval != 0) 468 return retval < 0; 469 470 return a->sectindex < b->sectindex; 471} 472 473/* Provide sorted array of pointers to sections of ADDRS. */ 474 475static std::vector<const struct other_sections *> 476addrs_section_sort (const section_addr_info &addrs) 477{ 478 int i; 479 480 std::vector<const struct other_sections *> array (addrs.size ()); 481 for (i = 0; i < addrs.size (); i++) 482 array[i] = &addrs[i]; 483 484 std::sort (array.begin (), array.end (), addrs_section_compar); 485 486 return array; 487} 488 489/* Relativize absolute addresses in ADDRS into offsets based on ABFD. Fill-in 490 also SECTINDEXes specific to ABFD there. This function can be used to 491 rebase ADDRS to start referencing different BFD than before. */ 492 493void 494addr_info_make_relative (section_addr_info *addrs, bfd *abfd) 495{ 496 asection *lower_sect; 497 CORE_ADDR lower_offset; 498 int i; 499 500 /* Find lowest loadable section to be used as starting point for 501 contiguous sections. */ 502 lower_sect = NULL; 503 bfd_map_over_sections (abfd, find_lowest_section, &lower_sect); 504 if (lower_sect == NULL) 505 { 506 warning (_("no loadable sections found in added symbol-file %s"), 507 bfd_get_filename (abfd)); 508 lower_offset = 0; 509 } 510 else 511 lower_offset = bfd_section_vma (lower_sect); 512 513 /* Create ADDRS_TO_ABFD_ADDRS array to map the sections in ADDRS to sections 514 in ABFD. Section names are not unique - there can be multiple sections of 515 the same name. Also the sections of the same name do not have to be 516 adjacent to each other. Some sections may be present only in one of the 517 files. Even sections present in both files do not have to be in the same 518 order. 519 520 Use stable sort by name for the sections in both files. Then linearly 521 scan both lists matching as most of the entries as possible. */ 522 523 std::vector<const struct other_sections *> addrs_sorted 524 = addrs_section_sort (*addrs); 525 526 section_addr_info abfd_addrs = build_section_addr_info_from_bfd (abfd); 527 std::vector<const struct other_sections *> abfd_addrs_sorted 528 = addrs_section_sort (abfd_addrs); 529 530 /* Now create ADDRS_TO_ABFD_ADDRS from ADDRS_SORTED and 531 ABFD_ADDRS_SORTED. */ 532 533 std::vector<const struct other_sections *> 534 addrs_to_abfd_addrs (addrs->size (), nullptr); 535 536 std::vector<const struct other_sections *>::iterator abfd_sorted_iter 537 = abfd_addrs_sorted.begin (); 538 for (const other_sections *sect : addrs_sorted) 539 { 540 const char *sect_name = addr_section_name (sect->name.c_str ()); 541 542 while (abfd_sorted_iter != abfd_addrs_sorted.end () 543 && strcmp (addr_section_name ((*abfd_sorted_iter)->name.c_str ()), 544 sect_name) < 0) 545 abfd_sorted_iter++; 546 547 if (abfd_sorted_iter != abfd_addrs_sorted.end () 548 && strcmp (addr_section_name ((*abfd_sorted_iter)->name.c_str ()), 549 sect_name) == 0) 550 { 551 int index_in_addrs; 552 553 /* Make the found item directly addressable from ADDRS. */ 554 index_in_addrs = sect - addrs->data (); 555 gdb_assert (addrs_to_abfd_addrs[index_in_addrs] == NULL); 556 addrs_to_abfd_addrs[index_in_addrs] = *abfd_sorted_iter; 557 558 /* Never use the same ABFD entry twice. */ 559 abfd_sorted_iter++; 560 } 561 } 562 563 /* Calculate offsets for the loadable sections. 564 FIXME! Sections must be in order of increasing loadable section 565 so that contiguous sections can use the lower-offset!!! 566 567 Adjust offsets if the segments are not contiguous. 568 If the section is contiguous, its offset should be set to 569 the offset of the highest loadable section lower than it 570 (the loadable section directly below it in memory). 571 this_offset = lower_offset = lower_addr - lower_orig_addr */ 572 573 for (i = 0; i < addrs->size (); i++) 574 { 575 const struct other_sections *sect = addrs_to_abfd_addrs[i]; 576 577 if (sect) 578 { 579 /* This is the index used by BFD. */ 580 (*addrs)[i].sectindex = sect->sectindex; 581 582 if ((*addrs)[i].addr != 0) 583 { 584 (*addrs)[i].addr -= sect->addr; 585 lower_offset = (*addrs)[i].addr; 586 } 587 else 588 (*addrs)[i].addr = lower_offset; 589 } 590 else 591 { 592 /* addr_section_name transformation is not used for SECT_NAME. */ 593 const std::string §_name = (*addrs)[i].name; 594 595 /* This section does not exist in ABFD, which is normally 596 unexpected and we want to issue a warning. 597 598 However, the ELF prelinker does create a few sections which are 599 marked in the main executable as loadable (they are loaded in 600 memory from the DYNAMIC segment) and yet are not present in 601 separate debug info files. This is fine, and should not cause 602 a warning. Shared libraries contain just the section 603 ".gnu.liblist" but it is not marked as loadable there. There is 604 no other way to identify them than by their name as the sections 605 created by prelink have no special flags. 606 607 For the sections `.bss' and `.sbss' see addr_section_name. */ 608 609 if (!(sect_name == ".gnu.liblist" 610 || sect_name == ".gnu.conflict" 611 || (sect_name == ".bss" 612 && i > 0 613 && (*addrs)[i - 1].name == ".dynbss" 614 && addrs_to_abfd_addrs[i - 1] != NULL) 615 || (sect_name == ".sbss" 616 && i > 0 617 && (*addrs)[i - 1].name == ".sdynbss" 618 && addrs_to_abfd_addrs[i - 1] != NULL))) 619 warning (_("section %s not found in %s"), sect_name.c_str (), 620 bfd_get_filename (abfd)); 621 622 (*addrs)[i].addr = 0; 623 (*addrs)[i].sectindex = -1; 624 } 625 } 626} 627 628/* Parse the user's idea of an offset for dynamic linking, into our idea 629 of how to represent it for fast symbol reading. This is the default 630 version of the sym_fns.sym_offsets function for symbol readers that 631 don't need to do anything special. It allocates a section_offsets table 632 for the objectfile OBJFILE and stuffs ADDR into all of the offsets. */ 633 634void 635default_symfile_offsets (struct objfile *objfile, 636 const section_addr_info &addrs) 637{ 638 objfile->section_offsets.resize (gdb_bfd_count_sections (objfile->obfd)); 639 relative_addr_info_to_section_offsets (objfile->section_offsets, addrs); 640 641 /* For relocatable files, all loadable sections will start at zero. 642 The zero is meaningless, so try to pick arbitrary addresses such 643 that no loadable sections overlap. This algorithm is quadratic, 644 but the number of sections in a single object file is generally 645 small. */ 646 if ((bfd_get_file_flags (objfile->obfd) & (EXEC_P | DYNAMIC)) == 0) 647 { 648 struct place_section_arg arg; 649 bfd *abfd = objfile->obfd; 650 asection *cur_sec; 651 652 for (cur_sec = abfd->sections; cur_sec != NULL; cur_sec = cur_sec->next) 653 /* We do not expect this to happen; just skip this step if the 654 relocatable file has a section with an assigned VMA. */ 655 if (bfd_section_vma (cur_sec) != 0) 656 break; 657 658 if (cur_sec == NULL) 659 { 660 section_offsets &offsets = objfile->section_offsets; 661 662 /* Pick non-overlapping offsets for sections the user did not 663 place explicitly. */ 664 arg.offsets = &objfile->section_offsets; 665 arg.lowest = 0; 666 bfd_map_over_sections (objfile->obfd, place_section, &arg); 667 668 /* Correctly filling in the section offsets is not quite 669 enough. Relocatable files have two properties that 670 (most) shared objects do not: 671 672 - Their debug information will contain relocations. Some 673 shared libraries do also, but many do not, so this can not 674 be assumed. 675 676 - If there are multiple code sections they will be loaded 677 at different relative addresses in memory than they are 678 in the objfile, since all sections in the file will start 679 at address zero. 680 681 Because GDB has very limited ability to map from an 682 address in debug info to the correct code section, 683 it relies on adding SECT_OFF_TEXT to things which might be 684 code. If we clear all the section offsets, and set the 685 section VMAs instead, then symfile_relocate_debug_section 686 will return meaningful debug information pointing at the 687 correct sections. 688 689 GDB has too many different data structures for section 690 addresses - a bfd, objfile, and so_list all have section 691 tables, as does exec_ops. Some of these could probably 692 be eliminated. */ 693 694 for (cur_sec = abfd->sections; cur_sec != NULL; 695 cur_sec = cur_sec->next) 696 { 697 if ((bfd_section_flags (cur_sec) & SEC_ALLOC) == 0) 698 continue; 699 700 bfd_set_section_vma (cur_sec, offsets[cur_sec->index]); 701 exec_set_section_address (bfd_get_filename (abfd), 702 cur_sec->index, 703 offsets[cur_sec->index]); 704 offsets[cur_sec->index] = 0; 705 } 706 } 707 } 708 709 /* Remember the bfd indexes for the .text, .data, .bss and 710 .rodata sections. */ 711 init_objfile_sect_indices (objfile); 712} 713 714/* Divide the file into segments, which are individual relocatable units. 715 This is the default version of the sym_fns.sym_segments function for 716 symbol readers that do not have an explicit representation of segments. 717 It assumes that object files do not have segments, and fully linked 718 files have a single segment. */ 719 720symfile_segment_data_up 721default_symfile_segments (bfd *abfd) 722{ 723 int num_sections, i; 724 asection *sect; 725 CORE_ADDR low, high; 726 727 /* Relocatable files contain enough information to position each 728 loadable section independently; they should not be relocated 729 in segments. */ 730 if ((bfd_get_file_flags (abfd) & (EXEC_P | DYNAMIC)) == 0) 731 return NULL; 732 733 /* Make sure there is at least one loadable section in the file. */ 734 for (sect = abfd->sections; sect != NULL; sect = sect->next) 735 { 736 if ((bfd_section_flags (sect) & SEC_ALLOC) == 0) 737 continue; 738 739 break; 740 } 741 if (sect == NULL) 742 return NULL; 743 744 low = bfd_section_vma (sect); 745 high = low + bfd_section_size (sect); 746 747 symfile_segment_data_up data (new symfile_segment_data); 748 749 num_sections = bfd_count_sections (abfd); 750 751 /* All elements are initialized to 0 (map to no segment). */ 752 data->segment_info.resize (num_sections); 753 754 for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next) 755 { 756 CORE_ADDR vma; 757 758 if ((bfd_section_flags (sect) & SEC_ALLOC) == 0) 759 continue; 760 761 vma = bfd_section_vma (sect); 762 if (vma < low) 763 low = vma; 764 if (vma + bfd_section_size (sect) > high) 765 high = vma + bfd_section_size (sect); 766 767 data->segment_info[i] = 1; 768 } 769 770 data->segments.emplace_back (low, high - low); 771 772 return data; 773} 774 775/* This is a convenience function to call sym_read for OBJFILE and 776 possibly force the partial symbols to be read. */ 777 778static void 779read_symbols (struct objfile *objfile, symfile_add_flags add_flags) 780{ 781 (*objfile->sf->sym_read) (objfile, add_flags); 782 objfile->per_bfd->minsyms_read = true; 783 784 /* find_separate_debug_file_in_section should be called only if there is 785 single binary with no existing separate debug info file. */ 786 if (!objfile_has_partial_symbols (objfile) 787 && objfile->separate_debug_objfile == NULL 788 && objfile->separate_debug_objfile_backlink == NULL) 789 { 790 gdb_bfd_ref_ptr abfd (find_separate_debug_file_in_section (objfile)); 791 792 if (abfd != NULL) 793 { 794 /* find_separate_debug_file_in_section uses the same filename for the 795 virtual section-as-bfd like the bfd filename containing the 796 section. Therefore use also non-canonical name form for the same 797 file containing the section. */ 798 symbol_file_add_separate (abfd.get (), 799 bfd_get_filename (abfd.get ()), 800 add_flags | SYMFILE_NOT_FILENAME, objfile); 801 } 802 } 803 if ((add_flags & SYMFILE_NO_READ) == 0) 804 require_partial_symbols (objfile, false); 805} 806 807/* Initialize entry point information for this objfile. */ 808 809static void 810init_entry_point_info (struct objfile *objfile) 811{ 812 struct entry_info *ei = &objfile->per_bfd->ei; 813 814 if (ei->initialized) 815 return; 816 ei->initialized = 1; 817 818 /* Save startup file's range of PC addresses to help blockframe.c 819 decide where the bottom of the stack is. */ 820 821 if (bfd_get_file_flags (objfile->obfd) & EXEC_P) 822 { 823 /* Executable file -- record its entry point so we'll recognize 824 the startup file because it contains the entry point. */ 825 ei->entry_point = bfd_get_start_address (objfile->obfd); 826 ei->entry_point_p = 1; 827 } 828 else if (bfd_get_file_flags (objfile->obfd) & DYNAMIC 829 && bfd_get_start_address (objfile->obfd) != 0) 830 { 831 /* Some shared libraries may have entry points set and be 832 runnable. There's no clear way to indicate this, so just check 833 for values other than zero. */ 834 ei->entry_point = bfd_get_start_address (objfile->obfd); 835 ei->entry_point_p = 1; 836 } 837 else 838 { 839 /* Examination of non-executable.o files. Short-circuit this stuff. */ 840 ei->entry_point_p = 0; 841 } 842 843 if (ei->entry_point_p) 844 { 845 struct obj_section *osect; 846 CORE_ADDR entry_point = ei->entry_point; 847 int found; 848 849 /* Make certain that the address points at real code, and not a 850 function descriptor. */ 851 entry_point 852 = gdbarch_convert_from_func_ptr_addr (objfile->arch (), 853 entry_point, 854 current_top_target ()); 855 856 /* Remove any ISA markers, so that this matches entries in the 857 symbol table. */ 858 ei->entry_point 859 = gdbarch_addr_bits_remove (objfile->arch (), entry_point); 860 861 found = 0; 862 ALL_OBJFILE_OSECTIONS (objfile, osect) 863 { 864 struct bfd_section *sect = osect->the_bfd_section; 865 866 if (entry_point >= bfd_section_vma (sect) 867 && entry_point < (bfd_section_vma (sect) 868 + bfd_section_size (sect))) 869 { 870 ei->the_bfd_section_index 871 = gdb_bfd_section_index (objfile->obfd, sect); 872 found = 1; 873 break; 874 } 875 } 876 877 if (!found) 878 ei->the_bfd_section_index = SECT_OFF_TEXT (objfile); 879 } 880} 881 882/* Process a symbol file, as either the main file or as a dynamically 883 loaded file. 884 885 This function does not set the OBJFILE's entry-point info. 886 887 OBJFILE is where the symbols are to be read from. 888 889 ADDRS is the list of section load addresses. If the user has given 890 an 'add-symbol-file' command, then this is the list of offsets and 891 addresses he or she provided as arguments to the command; or, if 892 we're handling a shared library, these are the actual addresses the 893 sections are loaded at, according to the inferior's dynamic linker 894 (as gleaned by GDB's shared library code). We convert each address 895 into an offset from the section VMA's as it appears in the object 896 file, and then call the file's sym_offsets function to convert this 897 into a format-specific offset table --- a `section_offsets'. 898 The sectindex field is used to control the ordering of sections 899 with the same name. Upon return, it is updated to contain the 900 corresponding BFD section index, or -1 if the section was not found. 901 902 ADD_FLAGS encodes verbosity level, whether this is main symbol or 903 an extra symbol file such as dynamically loaded code, and whether 904 breakpoint reset should be deferred. */ 905 906static void 907syms_from_objfile_1 (struct objfile *objfile, 908 section_addr_info *addrs, 909 symfile_add_flags add_flags) 910{ 911 section_addr_info local_addr; 912 const int mainline = add_flags & SYMFILE_MAINLINE; 913 914 objfile_set_sym_fns (objfile, find_sym_fns (objfile->obfd)); 915 916 if (objfile->sf == NULL) 917 { 918 /* No symbols to load, but we still need to make sure 919 that the section_offsets table is allocated. */ 920 int num_sections = gdb_bfd_count_sections (objfile->obfd); 921 922 objfile->section_offsets.assign (num_sections, 0); 923 return; 924 } 925 926 /* Make sure that partially constructed symbol tables will be cleaned up 927 if an error occurs during symbol reading. */ 928 gdb::optional<clear_symtab_users_cleanup> defer_clear_users; 929 930 objfile_up objfile_holder (objfile); 931 932 /* If ADDRS is NULL, put together a dummy address list. 933 We now establish the convention that an addr of zero means 934 no load address was specified. */ 935 if (! addrs) 936 addrs = &local_addr; 937 938 if (mainline) 939 { 940 /* We will modify the main symbol table, make sure that all its users 941 will be cleaned up if an error occurs during symbol reading. */ 942 defer_clear_users.emplace ((symfile_add_flag) 0); 943 944 /* Since no error yet, throw away the old symbol table. */ 945 946 if (symfile_objfile != NULL) 947 { 948 symfile_objfile->unlink (); 949 gdb_assert (symfile_objfile == NULL); 950 } 951 952 /* Currently we keep symbols from the add-symbol-file command. 953 If the user wants to get rid of them, they should do "symbol-file" 954 without arguments first. Not sure this is the best behavior 955 (PR 2207). */ 956 957 (*objfile->sf->sym_new_init) (objfile); 958 } 959 960 /* Convert addr into an offset rather than an absolute address. 961 We find the lowest address of a loaded segment in the objfile, 962 and assume that <addr> is where that got loaded. 963 964 We no longer warn if the lowest section is not a text segment (as 965 happens for the PA64 port. */ 966 if (addrs->size () > 0) 967 addr_info_make_relative (addrs, objfile->obfd); 968 969 /* Initialize symbol reading routines for this objfile, allow complaints to 970 appear for this new file, and record how verbose to be, then do the 971 initial symbol reading for this file. */ 972 973 (*objfile->sf->sym_init) (objfile); 974 clear_complaints (); 975 976 (*objfile->sf->sym_offsets) (objfile, *addrs); 977 978 read_symbols (objfile, add_flags); 979 980 /* Discard cleanups as symbol reading was successful. */ 981 982 objfile_holder.release (); 983 if (defer_clear_users) 984 defer_clear_users->release (); 985} 986 987/* Same as syms_from_objfile_1, but also initializes the objfile 988 entry-point info. */ 989 990static void 991syms_from_objfile (struct objfile *objfile, 992 section_addr_info *addrs, 993 symfile_add_flags add_flags) 994{ 995 syms_from_objfile_1 (objfile, addrs, add_flags); 996 init_entry_point_info (objfile); 997} 998 999/* Perform required actions after either reading in the initial 1000 symbols for a new objfile, or mapping in the symbols from a reusable 1001 objfile. ADD_FLAGS is a bitmask of enum symfile_add_flags. */ 1002 1003static void 1004finish_new_objfile (struct objfile *objfile, symfile_add_flags add_flags) 1005{ 1006 /* If this is the main symbol file we have to clean up all users of the 1007 old main symbol file. Otherwise it is sufficient to fixup all the 1008 breakpoints that may have been redefined by this symbol file. */ 1009 if (add_flags & SYMFILE_MAINLINE) 1010 { 1011 /* OK, make it the "real" symbol file. */ 1012 symfile_objfile = objfile; 1013 1014 clear_symtab_users (add_flags); 1015 } 1016 else if ((add_flags & SYMFILE_DEFER_BP_RESET) == 0) 1017 { 1018 breakpoint_re_set (); 1019 } 1020 1021 /* We're done reading the symbol file; finish off complaints. */ 1022 clear_complaints (); 1023} 1024 1025/* Process a symbol file, as either the main file or as a dynamically 1026 loaded file. 1027 1028 ABFD is a BFD already open on the file, as from symfile_bfd_open. 1029 A new reference is acquired by this function. 1030 1031 For NAME description see the objfile constructor. 1032 1033 ADD_FLAGS encodes verbosity, whether this is main symbol file or 1034 extra, such as dynamically loaded code, and what to do with breakpoints. 1035 1036 ADDRS is as described for syms_from_objfile_1, above. 1037 ADDRS is ignored when SYMFILE_MAINLINE bit is set in ADD_FLAGS. 1038 1039 PARENT is the original objfile if ABFD is a separate debug info file. 1040 Otherwise PARENT is NULL. 1041 1042 Upon success, returns a pointer to the objfile that was added. 1043 Upon failure, jumps back to command level (never returns). */ 1044 1045static struct objfile * 1046symbol_file_add_with_addrs (bfd *abfd, const char *name, 1047 symfile_add_flags add_flags, 1048 section_addr_info *addrs, 1049 objfile_flags flags, struct objfile *parent) 1050{ 1051 struct objfile *objfile; 1052 const int from_tty = add_flags & SYMFILE_VERBOSE; 1053 const int mainline = add_flags & SYMFILE_MAINLINE; 1054 const int always_confirm = add_flags & SYMFILE_ALWAYS_CONFIRM; 1055 const int should_print = (print_symbol_loading_p (from_tty, mainline, 1) 1056 && (readnow_symbol_files 1057 || (add_flags & SYMFILE_NO_READ) == 0)); 1058 1059 if (readnow_symbol_files) 1060 { 1061 flags |= OBJF_READNOW; 1062 add_flags &= ~SYMFILE_NO_READ; 1063 } 1064 else if (readnever_symbol_files 1065 || (parent != NULL && (parent->flags & OBJF_READNEVER))) 1066 { 1067 flags |= OBJF_READNEVER; 1068 add_flags |= SYMFILE_NO_READ; 1069 } 1070 if ((add_flags & SYMFILE_NOT_FILENAME) != 0) 1071 flags |= OBJF_NOT_FILENAME; 1072 1073 /* Give user a chance to burp if ALWAYS_CONFIRM or we'd be 1074 interactively wiping out any existing symbols. */ 1075 1076 if (from_tty 1077 && (always_confirm 1078 || ((have_full_symbols () || have_partial_symbols ()) 1079 && mainline)) 1080 && !query (_("Load new symbol table from \"%s\"? "), name)) 1081 error (_("Not confirmed.")); 1082 1083 if (mainline) 1084 flags |= OBJF_MAINLINE; 1085 objfile = objfile::make (abfd, name, flags, parent); 1086 1087 /* We either created a new mapped symbol table, mapped an existing 1088 symbol table file which has not had initial symbol reading 1089 performed, or need to read an unmapped symbol table. */ 1090 if (should_print) 1091 { 1092 if (deprecated_pre_add_symbol_hook) 1093 deprecated_pre_add_symbol_hook (name); 1094 else 1095 printf_filtered (_("Reading symbols from %ps...\n"), 1096 styled_string (file_name_style.style (), name)); 1097 } 1098 syms_from_objfile (objfile, addrs, add_flags); 1099 1100 /* We now have at least a partial symbol table. Check to see if the 1101 user requested that all symbols be read on initial access via either 1102 the gdb startup command line or on a per symbol file basis. Expand 1103 all partial symbol tables for this objfile if so. */ 1104 1105 if ((flags & OBJF_READNOW)) 1106 { 1107 if (should_print) 1108 printf_filtered (_("Expanding full symbols from %ps...\n"), 1109 styled_string (file_name_style.style (), name)); 1110 1111 if (objfile->sf) 1112 objfile->sf->qf->expand_all_symtabs (objfile); 1113 } 1114 1115 /* Note that we only print a message if we have no symbols and have 1116 no separate debug file. If there is a separate debug file which 1117 does not have symbols, we'll have emitted this message for that 1118 file, and so printing it twice is just redundant. */ 1119 if (should_print && !objfile_has_symbols (objfile) 1120 && objfile->separate_debug_objfile == nullptr) 1121 printf_filtered (_("(No debugging symbols found in %ps)\n"), 1122 styled_string (file_name_style.style (), name)); 1123 1124 if (should_print) 1125 { 1126 if (deprecated_post_add_symbol_hook) 1127 deprecated_post_add_symbol_hook (); 1128 } 1129 1130 /* We print some messages regardless of whether 'from_tty || 1131 info_verbose' is true, so make sure they go out at the right 1132 time. */ 1133 gdb_flush (gdb_stdout); 1134 1135 if (objfile->sf == NULL) 1136 { 1137 gdb::observers::new_objfile.notify (objfile); 1138 return objfile; /* No symbols. */ 1139 } 1140 1141 finish_new_objfile (objfile, add_flags); 1142 1143 gdb::observers::new_objfile.notify (objfile); 1144 1145 bfd_cache_close_all (); 1146 return (objfile); 1147} 1148 1149/* Add BFD as a separate debug file for OBJFILE. For NAME description 1150 see the objfile constructor. */ 1151 1152void 1153symbol_file_add_separate (bfd *bfd, const char *name, 1154 symfile_add_flags symfile_flags, 1155 struct objfile *objfile) 1156{ 1157 /* Create section_addr_info. We can't directly use offsets from OBJFILE 1158 because sections of BFD may not match sections of OBJFILE and because 1159 vma may have been modified by tools such as prelink. */ 1160 section_addr_info sap = build_section_addr_info_from_objfile (objfile); 1161 1162 symbol_file_add_with_addrs 1163 (bfd, name, symfile_flags, &sap, 1164 objfile->flags & (OBJF_REORDERED | OBJF_SHARED | OBJF_READNOW 1165 | OBJF_USERLOADED | OBJF_MAINLINE), 1166 objfile); 1167} 1168 1169/* Process the symbol file ABFD, as either the main file or as a 1170 dynamically loaded file. 1171 See symbol_file_add_with_addrs's comments for details. */ 1172 1173struct objfile * 1174symbol_file_add_from_bfd (bfd *abfd, const char *name, 1175 symfile_add_flags add_flags, 1176 section_addr_info *addrs, 1177 objfile_flags flags, struct objfile *parent) 1178{ 1179 return symbol_file_add_with_addrs (abfd, name, add_flags, addrs, flags, 1180 parent); 1181} 1182 1183/* Process a symbol file, as either the main file or as a dynamically 1184 loaded file. See symbol_file_add_with_addrs's comments for details. */ 1185 1186struct objfile * 1187symbol_file_add (const char *name, symfile_add_flags add_flags, 1188 section_addr_info *addrs, objfile_flags flags) 1189{ 1190 gdb_bfd_ref_ptr bfd (symfile_bfd_open (name)); 1191 1192 return symbol_file_add_from_bfd (bfd.get (), name, add_flags, addrs, 1193 flags, NULL); 1194} 1195 1196/* Call symbol_file_add() with default values and update whatever is 1197 affected by the loading of a new main(). 1198 Used when the file is supplied in the gdb command line 1199 and by some targets with special loading requirements. 1200 The auxiliary function, symbol_file_add_main_1(), has the flags 1201 argument for the switches that can only be specified in the symbol_file 1202 command itself. */ 1203 1204void 1205symbol_file_add_main (const char *args, symfile_add_flags add_flags) 1206{ 1207 symbol_file_add_main_1 (args, add_flags, 0, 0); 1208} 1209 1210static void 1211symbol_file_add_main_1 (const char *args, symfile_add_flags add_flags, 1212 objfile_flags flags, CORE_ADDR reloff) 1213{ 1214 add_flags |= current_inferior ()->symfile_flags | SYMFILE_MAINLINE; 1215 1216 struct objfile *objfile = symbol_file_add (args, add_flags, NULL, flags); 1217 if (reloff != 0) 1218 objfile_rebase (objfile, reloff); 1219 1220 /* Getting new symbols may change our opinion about 1221 what is frameless. */ 1222 reinit_frame_cache (); 1223 1224 if ((add_flags & SYMFILE_NO_READ) == 0) 1225 set_initial_language (); 1226} 1227 1228void 1229symbol_file_clear (int from_tty) 1230{ 1231 if ((have_full_symbols () || have_partial_symbols ()) 1232 && from_tty 1233 && (symfile_objfile 1234 ? !query (_("Discard symbol table from `%s'? "), 1235 objfile_name (symfile_objfile)) 1236 : !query (_("Discard symbol table? ")))) 1237 error (_("Not confirmed.")); 1238 1239 /* solib descriptors may have handles to objfiles. Wipe them before their 1240 objfiles get stale by free_all_objfiles. */ 1241 no_shared_libraries (NULL, from_tty); 1242 1243 current_program_space->free_all_objfiles (); 1244 1245 clear_symtab_users (0); 1246 1247 gdb_assert (symfile_objfile == NULL); 1248 if (from_tty) 1249 printf_filtered (_("No symbol file now.\n")); 1250} 1251 1252/* See symfile.h. */ 1253 1254bool separate_debug_file_debug = false; 1255 1256static int 1257separate_debug_file_exists (const std::string &name, unsigned long crc, 1258 struct objfile *parent_objfile) 1259{ 1260 unsigned long file_crc; 1261 int file_crc_p; 1262 struct stat parent_stat, abfd_stat; 1263 int verified_as_different; 1264 1265 /* Find a separate debug info file as if symbols would be present in 1266 PARENT_OBJFILE itself this function would not be called. .gnu_debuglink 1267 section can contain just the basename of PARENT_OBJFILE without any 1268 ".debug" suffix as "/usr/lib/debug/path/to/file" is a separate tree where 1269 the separate debug infos with the same basename can exist. */ 1270 1271 if (filename_cmp (name.c_str (), objfile_name (parent_objfile)) == 0) 1272 return 0; 1273 1274 if (separate_debug_file_debug) 1275 { 1276 printf_filtered (_(" Trying %s..."), name.c_str ()); 1277 gdb_flush (gdb_stdout); 1278 } 1279 1280 gdb_bfd_ref_ptr abfd (gdb_bfd_open (name.c_str (), gnutarget)); 1281 1282 if (abfd == NULL) 1283 { 1284 if (separate_debug_file_debug) 1285 printf_filtered (_(" no, unable to open.\n")); 1286 1287 return 0; 1288 } 1289 1290 /* Verify symlinks were not the cause of filename_cmp name difference above. 1291 1292 Some operating systems, e.g. Windows, do not provide a meaningful 1293 st_ino; they always set it to zero. (Windows does provide a 1294 meaningful st_dev.) Files accessed from gdbservers that do not 1295 support the vFile:fstat packet will also have st_ino set to zero. 1296 Do not indicate a duplicate library in either case. While there 1297 is no guarantee that a system that provides meaningful inode 1298 numbers will never set st_ino to zero, this is merely an 1299 optimization, so we do not need to worry about false negatives. */ 1300 1301 if (bfd_stat (abfd.get (), &abfd_stat) == 0 1302 && abfd_stat.st_ino != 0 1303 && bfd_stat (parent_objfile->obfd, &parent_stat) == 0) 1304 { 1305 if (abfd_stat.st_dev == parent_stat.st_dev 1306 && abfd_stat.st_ino == parent_stat.st_ino) 1307 { 1308 if (separate_debug_file_debug) 1309 printf_filtered (_(" no, same file as the objfile.\n")); 1310 1311 return 0; 1312 } 1313 verified_as_different = 1; 1314 } 1315 else 1316 verified_as_different = 0; 1317 1318 file_crc_p = gdb_bfd_crc (abfd.get (), &file_crc); 1319 1320 if (!file_crc_p) 1321 { 1322 if (separate_debug_file_debug) 1323 printf_filtered (_(" no, error computing CRC.\n")); 1324 1325 return 0; 1326 } 1327 1328 if (crc != file_crc) 1329 { 1330 unsigned long parent_crc; 1331 1332 /* If the files could not be verified as different with 1333 bfd_stat then we need to calculate the parent's CRC 1334 to verify whether the files are different or not. */ 1335 1336 if (!verified_as_different) 1337 { 1338 if (!gdb_bfd_crc (parent_objfile->obfd, &parent_crc)) 1339 { 1340 if (separate_debug_file_debug) 1341 printf_filtered (_(" no, error computing CRC.\n")); 1342 1343 return 0; 1344 } 1345 } 1346 1347 if (verified_as_different || parent_crc != file_crc) 1348 warning (_("the debug information found in \"%s\"" 1349 " does not match \"%s\" (CRC mismatch).\n"), 1350 name.c_str (), objfile_name (parent_objfile)); 1351 1352 if (separate_debug_file_debug) 1353 printf_filtered (_(" no, CRC doesn't match.\n")); 1354 1355 return 0; 1356 } 1357 1358 if (separate_debug_file_debug) 1359 printf_filtered (_(" yes!\n")); 1360 1361 return 1; 1362} 1363 1364char *debug_file_directory = NULL; 1365static void 1366show_debug_file_directory (struct ui_file *file, int from_tty, 1367 struct cmd_list_element *c, const char *value) 1368{ 1369 fprintf_filtered (file, 1370 _("The directory where separate debug " 1371 "symbols are searched for is \"%s\".\n"), 1372 value); 1373} 1374 1375#if ! defined (DEBUG_SUBDIRECTORY) 1376#define DEBUG_SUBDIRECTORY ".debug" 1377#endif 1378 1379/* Find a separate debuginfo file for OBJFILE, using DIR as the directory 1380 where the original file resides (may not be the same as 1381 dirname(objfile->name) due to symlinks), and DEBUGLINK as the file we are 1382 looking for. CANON_DIR is the "realpath" form of DIR. 1383 DIR must contain a trailing '/'. 1384 Returns the path of the file with separate debug info, or an empty 1385 string. */ 1386 1387static std::string 1388find_separate_debug_file (const char *dir, 1389 const char *canon_dir, 1390 const char *debuglink, 1391 unsigned long crc32, struct objfile *objfile) 1392{ 1393 if (separate_debug_file_debug) 1394 printf_filtered (_("\nLooking for separate debug info (debug link) for " 1395 "%s\n"), objfile_name (objfile)); 1396 1397 /* First try in the same directory as the original file. */ 1398 std::string debugfile = dir; 1399 debugfile += debuglink; 1400 1401 if (separate_debug_file_exists (debugfile, crc32, objfile)) 1402 return debugfile; 1403 1404 /* Then try in the subdirectory named DEBUG_SUBDIRECTORY. */ 1405 debugfile = dir; 1406 debugfile += DEBUG_SUBDIRECTORY; 1407 debugfile += "/"; 1408 debugfile += debuglink; 1409 1410 if (separate_debug_file_exists (debugfile, crc32, objfile)) 1411 return debugfile; 1412 1413 /* Then try in the global debugfile directories. 1414 1415 Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will 1416 cause "/..." lookups. */ 1417 1418 bool target_prefix = startswith (dir, "target:"); 1419 const char *dir_notarget = target_prefix ? dir + strlen ("target:") : dir; 1420 std::vector<gdb::unique_xmalloc_ptr<char>> debugdir_vec 1421 = dirnames_to_char_ptr_vec (debug_file_directory); 1422 gdb::unique_xmalloc_ptr<char> canon_sysroot = gdb_realpath (gdb_sysroot); 1423 1424 /* MS-Windows/MS-DOS don't allow colons in file names; we must 1425 convert the drive letter into a one-letter directory, so that the 1426 file name resulting from splicing below will be valid. 1427 1428 FIXME: The below only works when GDB runs on MS-Windows/MS-DOS. 1429 There are various remote-debugging scenarios where such a 1430 transformation of the drive letter might be required when GDB runs 1431 on a Posix host, see 1432 1433 https://sourceware.org/ml/gdb-patches/2019-04/msg00605.html 1434 1435 If some of those scenarios need to be supported, we will need to 1436 use a different condition for HAS_DRIVE_SPEC and a different macro 1437 instead of STRIP_DRIVE_SPEC, which work on Posix systems as well. */ 1438 std::string drive; 1439 if (HAS_DRIVE_SPEC (dir_notarget)) 1440 { 1441 drive = dir_notarget[0]; 1442 dir_notarget = STRIP_DRIVE_SPEC (dir_notarget); 1443 } 1444 1445 for (const gdb::unique_xmalloc_ptr<char> &debugdir : debugdir_vec) 1446 { 1447 debugfile = target_prefix ? "target:" : ""; 1448 debugfile += debugdir.get (); 1449 debugfile += "/"; 1450 debugfile += drive; 1451 debugfile += dir_notarget; 1452 debugfile += debuglink; 1453 1454 if (separate_debug_file_exists (debugfile, crc32, objfile)) 1455 return debugfile; 1456 1457 const char *base_path = NULL; 1458 if (canon_dir != NULL) 1459 { 1460 if (canon_sysroot.get () != NULL) 1461 base_path = child_path (canon_sysroot.get (), canon_dir); 1462 else 1463 base_path = child_path (gdb_sysroot, canon_dir); 1464 } 1465 if (base_path != NULL) 1466 { 1467 /* If the file is in the sysroot, try using its base path in 1468 the global debugfile directory. */ 1469 debugfile = target_prefix ? "target:" : ""; 1470 debugfile += debugdir.get (); 1471 debugfile += "/"; 1472 debugfile += base_path; 1473 debugfile += "/"; 1474 debugfile += debuglink; 1475 1476 if (separate_debug_file_exists (debugfile, crc32, objfile)) 1477 return debugfile; 1478 1479 /* If the file is in the sysroot, try using its base path in 1480 the sysroot's global debugfile directory. */ 1481 debugfile = target_prefix ? "target:" : ""; 1482 debugfile += gdb_sysroot; 1483 debugfile += debugdir.get (); 1484 debugfile += "/"; 1485 debugfile += base_path; 1486 debugfile += "/"; 1487 debugfile += debuglink; 1488 1489 if (separate_debug_file_exists (debugfile, crc32, objfile)) 1490 return debugfile; 1491 } 1492 1493 } 1494 1495 return std::string (); 1496} 1497 1498/* Modify PATH to contain only "[/]directory/" part of PATH. 1499 If there were no directory separators in PATH, PATH will be empty 1500 string on return. */ 1501 1502static void 1503terminate_after_last_dir_separator (char *path) 1504{ 1505 int i; 1506 1507 /* Strip off the final filename part, leaving the directory name, 1508 followed by a slash. The directory can be relative or absolute. */ 1509 for (i = strlen(path) - 1; i >= 0; i--) 1510 if (IS_DIR_SEPARATOR (path[i])) 1511 break; 1512 1513 /* If I is -1 then no directory is present there and DIR will be "". */ 1514 path[i + 1] = '\0'; 1515} 1516 1517/* Find separate debuginfo for OBJFILE (using .gnu_debuglink section). 1518 Returns pathname, or an empty string. */ 1519 1520std::string 1521find_separate_debug_file_by_debuglink (struct objfile *objfile) 1522{ 1523 unsigned long crc32; 1524 1525 gdb::unique_xmalloc_ptr<char> debuglink 1526 (bfd_get_debug_link_info (objfile->obfd, &crc32)); 1527 1528 if (debuglink == NULL) 1529 { 1530 /* There's no separate debug info, hence there's no way we could 1531 load it => no warning. */ 1532 return std::string (); 1533 } 1534 1535 std::string dir = objfile_name (objfile); 1536 terminate_after_last_dir_separator (&dir[0]); 1537 gdb::unique_xmalloc_ptr<char> canon_dir (lrealpath (dir.c_str ())); 1538 1539 std::string debugfile 1540 = find_separate_debug_file (dir.c_str (), canon_dir.get (), 1541 debuglink.get (), crc32, objfile); 1542 1543 if (debugfile.empty ()) 1544 { 1545 /* For PR gdb/9538, try again with realpath (if different from the 1546 original). */ 1547 1548 struct stat st_buf; 1549 1550 if (lstat (objfile_name (objfile), &st_buf) == 0 1551 && S_ISLNK (st_buf.st_mode)) 1552 { 1553 gdb::unique_xmalloc_ptr<char> symlink_dir 1554 (lrealpath (objfile_name (objfile))); 1555 if (symlink_dir != NULL) 1556 { 1557 terminate_after_last_dir_separator (symlink_dir.get ()); 1558 if (dir != symlink_dir.get ()) 1559 { 1560 /* Different directory, so try using it. */ 1561 debugfile = find_separate_debug_file (symlink_dir.get (), 1562 symlink_dir.get (), 1563 debuglink.get (), 1564 crc32, 1565 objfile); 1566 } 1567 } 1568 } 1569 } 1570 1571 return debugfile; 1572} 1573 1574/* Make sure that OBJF_{READNOW,READNEVER} are not set 1575 simultaneously. */ 1576 1577static void 1578validate_readnow_readnever (objfile_flags flags) 1579{ 1580 if ((flags & OBJF_READNOW) && (flags & OBJF_READNEVER)) 1581 error (_("-readnow and -readnever cannot be used simultaneously")); 1582} 1583 1584/* This is the symbol-file command. Read the file, analyze its 1585 symbols, and add a struct symtab to a symtab list. The syntax of 1586 the command is rather bizarre: 1587 1588 1. The function buildargv implements various quoting conventions 1589 which are undocumented and have little or nothing in common with 1590 the way things are quoted (or not quoted) elsewhere in GDB. 1591 1592 2. Options are used, which are not generally used in GDB (perhaps 1593 "set mapped on", "set readnow on" would be better) 1594 1595 3. The order of options matters, which is contrary to GNU 1596 conventions (because it is confusing and inconvenient). */ 1597 1598void 1599symbol_file_command (const char *args, int from_tty) 1600{ 1601 dont_repeat (); 1602 1603 if (args == NULL) 1604 { 1605 symbol_file_clear (from_tty); 1606 } 1607 else 1608 { 1609 objfile_flags flags = OBJF_USERLOADED; 1610 symfile_add_flags add_flags = 0; 1611 char *name = NULL; 1612 bool stop_processing_options = false; 1613 CORE_ADDR offset = 0; 1614 int idx; 1615 char *arg; 1616 1617 if (from_tty) 1618 add_flags |= SYMFILE_VERBOSE; 1619 1620 gdb_argv built_argv (args); 1621 for (arg = built_argv[0], idx = 0; arg != NULL; arg = built_argv[++idx]) 1622 { 1623 if (stop_processing_options || *arg != '-') 1624 { 1625 if (name == NULL) 1626 name = arg; 1627 else 1628 error (_("Unrecognized argument \"%s\""), arg); 1629 } 1630 else if (strcmp (arg, "-readnow") == 0) 1631 flags |= OBJF_READNOW; 1632 else if (strcmp (arg, "-readnever") == 0) 1633 flags |= OBJF_READNEVER; 1634 else if (strcmp (arg, "-o") == 0) 1635 { 1636 arg = built_argv[++idx]; 1637 if (arg == NULL) 1638 error (_("Missing argument to -o")); 1639 1640 offset = parse_and_eval_address (arg); 1641 } 1642 else if (strcmp (arg, "--") == 0) 1643 stop_processing_options = true; 1644 else 1645 error (_("Unrecognized argument \"%s\""), arg); 1646 } 1647 1648 if (name == NULL) 1649 error (_("no symbol file name was specified")); 1650 1651 validate_readnow_readnever (flags); 1652 1653 /* Set SYMFILE_DEFER_BP_RESET because the proper displacement for a PIE 1654 (Position Independent Executable) main symbol file will only be 1655 computed by the solib_create_inferior_hook below. Without it, 1656 breakpoint_re_set would fail to insert the breakpoints with the zero 1657 displacement. */ 1658 add_flags |= SYMFILE_DEFER_BP_RESET; 1659 1660 symbol_file_add_main_1 (name, add_flags, flags, offset); 1661 1662 solib_create_inferior_hook (from_tty); 1663 1664 /* Now it's safe to re-add the breakpoints. */ 1665 breakpoint_re_set (); 1666 } 1667} 1668 1669/* Set the initial language. */ 1670 1671void 1672set_initial_language (void) 1673{ 1674 if (language_mode == language_mode_manual) 1675 return; 1676 enum language lang = main_language (); 1677 /* Make C the default language. */ 1678 enum language default_lang = language_c; 1679 1680 if (lang == language_unknown) 1681 { 1682 const char *name = main_name (); 1683 struct symbol *sym 1684 = lookup_symbol_in_language (name, NULL, VAR_DOMAIN, default_lang, 1685 NULL).symbol; 1686 1687 if (sym != NULL) 1688 lang = sym->language (); 1689 } 1690 1691 if (lang == language_unknown) 1692 { 1693 lang = default_lang; 1694 } 1695 1696 set_language (lang); 1697 expected_language = current_language; /* Don't warn the user. */ 1698} 1699 1700/* Open the file specified by NAME and hand it off to BFD for 1701 preliminary analysis. Return a newly initialized bfd *, which 1702 includes a newly malloc'd` copy of NAME (tilde-expanded and made 1703 absolute). In case of trouble, error() is called. */ 1704 1705gdb_bfd_ref_ptr 1706symfile_bfd_open (const char *name) 1707{ 1708 int desc = -1; 1709 1710 gdb::unique_xmalloc_ptr<char> absolute_name; 1711 if (!is_target_filename (name)) 1712 { 1713 gdb::unique_xmalloc_ptr<char> expanded_name (tilde_expand (name)); 1714 1715 /* Look down path for it, allocate 2nd new malloc'd copy. */ 1716 desc = openp (getenv ("PATH"), 1717 OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH, 1718 expanded_name.get (), O_RDONLY | O_BINARY, &absolute_name); 1719#if defined(__GO32__) || defined(_WIN32) || defined (__CYGWIN__) 1720 if (desc < 0) 1721 { 1722 char *exename = (char *) alloca (strlen (expanded_name.get ()) + 5); 1723 1724 strcat (strcpy (exename, expanded_name.get ()), ".exe"); 1725 desc = openp (getenv ("PATH"), 1726 OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH, 1727 exename, O_RDONLY | O_BINARY, &absolute_name); 1728 } 1729#endif 1730 if (desc < 0) 1731 perror_with_name (expanded_name.get ()); 1732 1733 name = absolute_name.get (); 1734 } 1735 1736 gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (name, gnutarget, desc)); 1737 if (sym_bfd == NULL) 1738 error (_("`%s': can't open to read symbols: %s."), name, 1739 bfd_errmsg (bfd_get_error ())); 1740 1741 if (!gdb_bfd_has_target_filename (sym_bfd.get ())) 1742 bfd_set_cacheable (sym_bfd.get (), 1); 1743 1744 if (!bfd_check_format (sym_bfd.get (), bfd_object)) 1745 error (_("`%s': can't read symbols: %s."), name, 1746 bfd_errmsg (bfd_get_error ())); 1747 1748 return sym_bfd; 1749} 1750 1751/* Return the section index for SECTION_NAME on OBJFILE. Return -1 if 1752 the section was not found. */ 1753 1754int 1755get_section_index (struct objfile *objfile, const char *section_name) 1756{ 1757 asection *sect = bfd_get_section_by_name (objfile->obfd, section_name); 1758 1759 if (sect) 1760 return sect->index; 1761 else 1762 return -1; 1763} 1764 1765/* Link SF into the global symtab_fns list. 1766 FLAVOUR is the file format that SF handles. 1767 Called on startup by the _initialize routine in each object file format 1768 reader, to register information about each format the reader is prepared 1769 to handle. */ 1770 1771void 1772add_symtab_fns (enum bfd_flavour flavour, const struct sym_fns *sf) 1773{ 1774 symtab_fns.emplace_back (flavour, sf); 1775} 1776 1777/* Initialize OBJFILE to read symbols from its associated BFD. It 1778 either returns or calls error(). The result is an initialized 1779 struct sym_fns in the objfile structure, that contains cached 1780 information about the symbol file. */ 1781 1782static const struct sym_fns * 1783find_sym_fns (bfd *abfd) 1784{ 1785 enum bfd_flavour our_flavour = bfd_get_flavour (abfd); 1786 1787 if (our_flavour == bfd_target_srec_flavour 1788 || our_flavour == bfd_target_ihex_flavour 1789 || our_flavour == bfd_target_tekhex_flavour) 1790 return NULL; /* No symbols. */ 1791 1792 for (const registered_sym_fns &rsf : symtab_fns) 1793 if (our_flavour == rsf.sym_flavour) 1794 return rsf.sym_fns; 1795 1796 error (_("I'm sorry, Dave, I can't do that. Symbol format `%s' unknown."), 1797 bfd_get_target (abfd)); 1798} 1799 1800 1801/* This function runs the load command of our current target. */ 1802 1803static void 1804load_command (const char *arg, int from_tty) 1805{ 1806 dont_repeat (); 1807 1808 /* The user might be reloading because the binary has changed. Take 1809 this opportunity to check. */ 1810 reopen_exec_file (); 1811 reread_symbols (); 1812 1813 std::string temp; 1814 if (arg == NULL) 1815 { 1816 const char *parg, *prev; 1817 1818 arg = get_exec_file (1); 1819 1820 /* We may need to quote this string so buildargv can pull it 1821 apart. */ 1822 prev = parg = arg; 1823 while ((parg = strpbrk (parg, "\\\"'\t "))) 1824 { 1825 temp.append (prev, parg - prev); 1826 prev = parg++; 1827 temp.push_back ('\\'); 1828 } 1829 /* If we have not copied anything yet, then we didn't see a 1830 character to quote, and we can just leave ARG unchanged. */ 1831 if (!temp.empty ()) 1832 { 1833 temp.append (prev); 1834 arg = temp.c_str (); 1835 } 1836 } 1837 1838 target_load (arg, from_tty); 1839 1840 /* After re-loading the executable, we don't really know which 1841 overlays are mapped any more. */ 1842 overlay_cache_invalid = 1; 1843} 1844 1845/* This version of "load" should be usable for any target. Currently 1846 it is just used for remote targets, not inftarg.c or core files, 1847 on the theory that only in that case is it useful. 1848 1849 Avoiding xmodem and the like seems like a win (a) because we don't have 1850 to worry about finding it, and (b) On VMS, fork() is very slow and so 1851 we don't want to run a subprocess. On the other hand, I'm not sure how 1852 performance compares. */ 1853 1854static int validate_download = 0; 1855 1856/* Callback service function for generic_load (bfd_map_over_sections). */ 1857 1858static void 1859add_section_size_callback (bfd *abfd, asection *asec, void *data) 1860{ 1861 bfd_size_type *sum = (bfd_size_type *) data; 1862 1863 *sum += bfd_section_size (asec); 1864} 1865 1866/* Opaque data for load_progress. */ 1867struct load_progress_data 1868{ 1869 /* Cumulative data. */ 1870 unsigned long write_count = 0; 1871 unsigned long data_count = 0; 1872 bfd_size_type total_size = 0; 1873}; 1874 1875/* Opaque data for load_progress for a single section. */ 1876struct load_progress_section_data 1877{ 1878 load_progress_section_data (load_progress_data *cumulative_, 1879 const char *section_name_, ULONGEST section_size_, 1880 CORE_ADDR lma_, gdb_byte *buffer_) 1881 : cumulative (cumulative_), section_name (section_name_), 1882 section_size (section_size_), lma (lma_), buffer (buffer_) 1883 {} 1884 1885 struct load_progress_data *cumulative; 1886 1887 /* Per-section data. */ 1888 const char *section_name; 1889 ULONGEST section_sent = 0; 1890 ULONGEST section_size; 1891 CORE_ADDR lma; 1892 gdb_byte *buffer; 1893}; 1894 1895/* Opaque data for load_section_callback. */ 1896struct load_section_data 1897{ 1898 load_section_data (load_progress_data *progress_data_) 1899 : progress_data (progress_data_) 1900 {} 1901 1902 ~load_section_data () 1903 { 1904 for (auto &&request : requests) 1905 { 1906 xfree (request.data); 1907 delete ((load_progress_section_data *) request.baton); 1908 } 1909 } 1910 1911 CORE_ADDR load_offset = 0; 1912 struct load_progress_data *progress_data; 1913 std::vector<struct memory_write_request> requests; 1914}; 1915 1916/* Target write callback routine for progress reporting. */ 1917 1918static void 1919load_progress (ULONGEST bytes, void *untyped_arg) 1920{ 1921 struct load_progress_section_data *args 1922 = (struct load_progress_section_data *) untyped_arg; 1923 struct load_progress_data *totals; 1924 1925 if (args == NULL) 1926 /* Writing padding data. No easy way to get at the cumulative 1927 stats, so just ignore this. */ 1928 return; 1929 1930 totals = args->cumulative; 1931 1932 if (bytes == 0 && args->section_sent == 0) 1933 { 1934 /* The write is just starting. Let the user know we've started 1935 this section. */ 1936 current_uiout->message ("Loading section %s, size %s lma %s\n", 1937 args->section_name, 1938 hex_string (args->section_size), 1939 paddress (target_gdbarch (), args->lma)); 1940 return; 1941 } 1942 1943 if (validate_download) 1944 { 1945 /* Broken memories and broken monitors manifest themselves here 1946 when bring new computers to life. This doubles already slow 1947 downloads. */ 1948 /* NOTE: cagney/1999-10-18: A more efficient implementation 1949 might add a verify_memory() method to the target vector and 1950 then use that. remote.c could implement that method using 1951 the ``qCRC'' packet. */ 1952 gdb::byte_vector check (bytes); 1953 1954 if (target_read_memory (args->lma, check.data (), bytes) != 0) 1955 error (_("Download verify read failed at %s"), 1956 paddress (target_gdbarch (), args->lma)); 1957 if (memcmp (args->buffer, check.data (), bytes) != 0) 1958 error (_("Download verify compare failed at %s"), 1959 paddress (target_gdbarch (), args->lma)); 1960 } 1961 totals->data_count += bytes; 1962 args->lma += bytes; 1963 args->buffer += bytes; 1964 totals->write_count += 1; 1965 args->section_sent += bytes; 1966 if (check_quit_flag () 1967 || (deprecated_ui_load_progress_hook != NULL 1968 && deprecated_ui_load_progress_hook (args->section_name, 1969 args->section_sent))) 1970 error (_("Canceled the download")); 1971 1972 if (deprecated_show_load_progress != NULL) 1973 deprecated_show_load_progress (args->section_name, 1974 args->section_sent, 1975 args->section_size, 1976 totals->data_count, 1977 totals->total_size); 1978} 1979 1980/* Callback service function for generic_load (bfd_map_over_sections). */ 1981 1982static void 1983load_section_callback (bfd *abfd, asection *asec, void *data) 1984{ 1985 struct load_section_data *args = (struct load_section_data *) data; 1986 bfd_size_type size = bfd_section_size (asec); 1987 const char *sect_name = bfd_section_name (asec); 1988 1989 if ((bfd_section_flags (asec) & SEC_LOAD) == 0) 1990 return; 1991 1992 if (size == 0) 1993 return; 1994 1995 ULONGEST begin = bfd_section_lma (asec) + args->load_offset; 1996 ULONGEST end = begin + size; 1997 gdb_byte *buffer = (gdb_byte *) xmalloc (size); 1998 bfd_get_section_contents (abfd, asec, buffer, 0, size); 1999 2000 load_progress_section_data *section_data 2001 = new load_progress_section_data (args->progress_data, sect_name, size, 2002 begin, buffer); 2003 2004 args->requests.emplace_back (begin, end, buffer, section_data); 2005} 2006 2007static void print_transfer_performance (struct ui_file *stream, 2008 unsigned long data_count, 2009 unsigned long write_count, 2010 std::chrono::steady_clock::duration d); 2011 2012/* See symfile.h. */ 2013 2014void 2015generic_load (const char *args, int from_tty) 2016{ 2017 struct load_progress_data total_progress; 2018 struct load_section_data cbdata (&total_progress); 2019 struct ui_out *uiout = current_uiout; 2020 2021 if (args == NULL) 2022 error_no_arg (_("file to load")); 2023 2024 gdb_argv argv (args); 2025 2026 gdb::unique_xmalloc_ptr<char> filename (tilde_expand (argv[0])); 2027 2028 if (argv[1] != NULL) 2029 { 2030 const char *endptr; 2031 2032 cbdata.load_offset = strtoulst (argv[1], &endptr, 0); 2033 2034 /* If the last word was not a valid number then 2035 treat it as a file name with spaces in. */ 2036 if (argv[1] == endptr) 2037 error (_("Invalid download offset:%s."), argv[1]); 2038 2039 if (argv[2] != NULL) 2040 error (_("Too many parameters.")); 2041 } 2042 2043 /* Open the file for loading. */ 2044 gdb_bfd_ref_ptr loadfile_bfd (gdb_bfd_open (filename.get (), gnutarget)); 2045 if (loadfile_bfd == NULL) 2046 perror_with_name (filename.get ()); 2047 2048 if (!bfd_check_format (loadfile_bfd.get (), bfd_object)) 2049 { 2050 error (_("\"%s\" is not an object file: %s"), filename.get (), 2051 bfd_errmsg (bfd_get_error ())); 2052 } 2053 2054 bfd_map_over_sections (loadfile_bfd.get (), add_section_size_callback, 2055 (void *) &total_progress.total_size); 2056 2057 bfd_map_over_sections (loadfile_bfd.get (), load_section_callback, &cbdata); 2058 2059 using namespace std::chrono; 2060 2061 steady_clock::time_point start_time = steady_clock::now (); 2062 2063 if (target_write_memory_blocks (cbdata.requests, flash_discard, 2064 load_progress) != 0) 2065 error (_("Load failed")); 2066 2067 steady_clock::time_point end_time = steady_clock::now (); 2068 2069 CORE_ADDR entry = bfd_get_start_address (loadfile_bfd.get ()); 2070 entry = gdbarch_addr_bits_remove (target_gdbarch (), entry); 2071 uiout->text ("Start address "); 2072 uiout->field_core_addr ("address", target_gdbarch (), entry); 2073 uiout->text (", load size "); 2074 uiout->field_unsigned ("load-size", total_progress.data_count); 2075 uiout->text ("\n"); 2076 regcache_write_pc (get_current_regcache (), entry); 2077 2078 /* Reset breakpoints, now that we have changed the load image. For 2079 instance, breakpoints may have been set (or reset, by 2080 post_create_inferior) while connected to the target but before we 2081 loaded the program. In that case, the prologue analyzer could 2082 have read instructions from the target to find the right 2083 breakpoint locations. Loading has changed the contents of that 2084 memory. */ 2085 2086 breakpoint_re_set (); 2087 2088 print_transfer_performance (gdb_stdout, total_progress.data_count, 2089 total_progress.write_count, 2090 end_time - start_time); 2091} 2092 2093/* Report on STREAM the performance of a memory transfer operation, 2094 such as 'load'. DATA_COUNT is the number of bytes transferred. 2095 WRITE_COUNT is the number of separate write operations, or 0, if 2096 that information is not available. TIME is how long the operation 2097 lasted. */ 2098 2099static void 2100print_transfer_performance (struct ui_file *stream, 2101 unsigned long data_count, 2102 unsigned long write_count, 2103 std::chrono::steady_clock::duration time) 2104{ 2105 using namespace std::chrono; 2106 struct ui_out *uiout = current_uiout; 2107 2108 milliseconds ms = duration_cast<milliseconds> (time); 2109 2110 uiout->text ("Transfer rate: "); 2111 if (ms.count () > 0) 2112 { 2113 unsigned long rate = ((ULONGEST) data_count * 1000) / ms.count (); 2114 2115 if (uiout->is_mi_like_p ()) 2116 { 2117 uiout->field_unsigned ("transfer-rate", rate * 8); 2118 uiout->text (" bits/sec"); 2119 } 2120 else if (rate < 1024) 2121 { 2122 uiout->field_unsigned ("transfer-rate", rate); 2123 uiout->text (" bytes/sec"); 2124 } 2125 else 2126 { 2127 uiout->field_unsigned ("transfer-rate", rate / 1024); 2128 uiout->text (" KB/sec"); 2129 } 2130 } 2131 else 2132 { 2133 uiout->field_unsigned ("transferred-bits", (data_count * 8)); 2134 uiout->text (" bits in <1 sec"); 2135 } 2136 if (write_count > 0) 2137 { 2138 uiout->text (", "); 2139 uiout->field_unsigned ("write-rate", data_count / write_count); 2140 uiout->text (" bytes/write"); 2141 } 2142 uiout->text (".\n"); 2143} 2144 2145/* Add an OFFSET to the start address of each section in OBJF, except 2146 sections that were specified in ADDRS. */ 2147 2148static void 2149set_objfile_default_section_offset (struct objfile *objf, 2150 const section_addr_info &addrs, 2151 CORE_ADDR offset) 2152{ 2153 /* Add OFFSET to all sections by default. */ 2154 section_offsets offsets (objf->section_offsets.size (), offset); 2155 2156 /* Create sorted lists of all sections in ADDRS as well as all 2157 sections in OBJF. */ 2158 2159 std::vector<const struct other_sections *> addrs_sorted 2160 = addrs_section_sort (addrs); 2161 2162 section_addr_info objf_addrs 2163 = build_section_addr_info_from_objfile (objf); 2164 std::vector<const struct other_sections *> objf_addrs_sorted 2165 = addrs_section_sort (objf_addrs); 2166 2167 /* Walk the BFD section list, and if a matching section is found in 2168 ADDRS_SORTED_LIST, set its offset to zero to keep its address 2169 unchanged. 2170 2171 Note that both lists may contain multiple sections with the same 2172 name, and then the sections from ADDRS are matched in BFD order 2173 (thanks to sectindex). */ 2174 2175 std::vector<const struct other_sections *>::iterator addrs_sorted_iter 2176 = addrs_sorted.begin (); 2177 for (const other_sections *objf_sect : objf_addrs_sorted) 2178 { 2179 const char *objf_name = addr_section_name (objf_sect->name.c_str ()); 2180 int cmp = -1; 2181 2182 while (cmp < 0 && addrs_sorted_iter != addrs_sorted.end ()) 2183 { 2184 const struct other_sections *sect = *addrs_sorted_iter; 2185 const char *sect_name = addr_section_name (sect->name.c_str ()); 2186 cmp = strcmp (sect_name, objf_name); 2187 if (cmp <= 0) 2188 ++addrs_sorted_iter; 2189 } 2190 2191 if (cmp == 0) 2192 offsets[objf_sect->sectindex] = 0; 2193 } 2194 2195 /* Apply the new section offsets. */ 2196 objfile_relocate (objf, offsets); 2197} 2198 2199/* This function allows the addition of incrementally linked object files. 2200 It does not modify any state in the target, only in the debugger. */ 2201 2202static void 2203add_symbol_file_command (const char *args, int from_tty) 2204{ 2205 struct gdbarch *gdbarch = get_current_arch (); 2206 gdb::unique_xmalloc_ptr<char> filename; 2207 char *arg; 2208 int argcnt = 0; 2209 struct objfile *objf; 2210 objfile_flags flags = OBJF_USERLOADED | OBJF_SHARED; 2211 symfile_add_flags add_flags = 0; 2212 2213 if (from_tty) 2214 add_flags |= SYMFILE_VERBOSE; 2215 2216 struct sect_opt 2217 { 2218 const char *name; 2219 const char *value; 2220 }; 2221 2222 std::vector<sect_opt> sect_opts = { { ".text", NULL } }; 2223 bool stop_processing_options = false; 2224 CORE_ADDR offset = 0; 2225 2226 dont_repeat (); 2227 2228 if (args == NULL) 2229 error (_("add-symbol-file takes a file name and an address")); 2230 2231 bool seen_addr = false; 2232 bool seen_offset = false; 2233 gdb_argv argv (args); 2234 2235 for (arg = argv[0], argcnt = 0; arg != NULL; arg = argv[++argcnt]) 2236 { 2237 if (stop_processing_options || *arg != '-') 2238 { 2239 if (filename == NULL) 2240 { 2241 /* First non-option argument is always the filename. */ 2242 filename.reset (tilde_expand (arg)); 2243 } 2244 else if (!seen_addr) 2245 { 2246 /* The second non-option argument is always the text 2247 address at which to load the program. */ 2248 sect_opts[0].value = arg; 2249 seen_addr = true; 2250 } 2251 else 2252 error (_("Unrecognized argument \"%s\""), arg); 2253 } 2254 else if (strcmp (arg, "-readnow") == 0) 2255 flags |= OBJF_READNOW; 2256 else if (strcmp (arg, "-readnever") == 0) 2257 flags |= OBJF_READNEVER; 2258 else if (strcmp (arg, "-s") == 0) 2259 { 2260 if (argv[argcnt + 1] == NULL) 2261 error (_("Missing section name after \"-s\"")); 2262 else if (argv[argcnt + 2] == NULL) 2263 error (_("Missing section address after \"-s\"")); 2264 2265 sect_opt sect = { argv[argcnt + 1], argv[argcnt + 2] }; 2266 2267 sect_opts.push_back (sect); 2268 argcnt += 2; 2269 } 2270 else if (strcmp (arg, "-o") == 0) 2271 { 2272 arg = argv[++argcnt]; 2273 if (arg == NULL) 2274 error (_("Missing argument to -o")); 2275 2276 offset = parse_and_eval_address (arg); 2277 seen_offset = true; 2278 } 2279 else if (strcmp (arg, "--") == 0) 2280 stop_processing_options = true; 2281 else 2282 error (_("Unrecognized argument \"%s\""), arg); 2283 } 2284 2285 if (filename == NULL) 2286 error (_("You must provide a filename to be loaded.")); 2287 2288 validate_readnow_readnever (flags); 2289 2290 /* Print the prompt for the query below. And save the arguments into 2291 a sect_addr_info structure to be passed around to other 2292 functions. We have to split this up into separate print 2293 statements because hex_string returns a local static 2294 string. */ 2295 2296 printf_unfiltered (_("add symbol table from file \"%s\""), 2297 filename.get ()); 2298 section_addr_info section_addrs; 2299 std::vector<sect_opt>::const_iterator it = sect_opts.begin (); 2300 if (!seen_addr) 2301 ++it; 2302 for (; it != sect_opts.end (); ++it) 2303 { 2304 CORE_ADDR addr; 2305 const char *val = it->value; 2306 const char *sec = it->name; 2307 2308 if (section_addrs.empty ()) 2309 printf_unfiltered (_(" at\n")); 2310 addr = parse_and_eval_address (val); 2311 2312 /* Here we store the section offsets in the order they were 2313 entered on the command line. Every array element is 2314 assigned an ascending section index to preserve the above 2315 order over an unstable sorting algorithm. This dummy 2316 index is not used for any other purpose. 2317 */ 2318 section_addrs.emplace_back (addr, sec, section_addrs.size ()); 2319 printf_filtered ("\t%s_addr = %s\n", sec, 2320 paddress (gdbarch, addr)); 2321 2322 /* The object's sections are initialized when a 2323 call is made to build_objfile_section_table (objfile). 2324 This happens in reread_symbols. 2325 At this point, we don't know what file type this is, 2326 so we can't determine what section names are valid. */ 2327 } 2328 if (seen_offset) 2329 printf_unfiltered (_("%s offset by %s\n"), 2330 (section_addrs.empty () 2331 ? _(" with all sections") 2332 : _("with other sections")), 2333 paddress (gdbarch, offset)); 2334 else if (section_addrs.empty ()) 2335 printf_unfiltered ("\n"); 2336 2337 if (from_tty && (!query ("%s", ""))) 2338 error (_("Not confirmed.")); 2339 2340 objf = symbol_file_add (filename.get (), add_flags, §ion_addrs, 2341 flags); 2342 if (!objfile_has_symbols (objf) && objf->per_bfd->minimal_symbol_count <= 0) 2343 warning (_("newly-added symbol file \"%s\" does not provide any symbols"), 2344 filename.get ()); 2345 2346 if (seen_offset) 2347 set_objfile_default_section_offset (objf, section_addrs, offset); 2348 2349 add_target_sections_of_objfile (objf); 2350 2351 /* Getting new symbols may change our opinion about what is 2352 frameless. */ 2353 reinit_frame_cache (); 2354} 2355 2356 2357/* This function removes a symbol file that was added via add-symbol-file. */ 2358 2359static void 2360remove_symbol_file_command (const char *args, int from_tty) 2361{ 2362 struct objfile *objf = NULL; 2363 struct program_space *pspace = current_program_space; 2364 2365 dont_repeat (); 2366 2367 if (args == NULL) 2368 error (_("remove-symbol-file: no symbol file provided")); 2369 2370 gdb_argv argv (args); 2371 2372 if (strcmp (argv[0], "-a") == 0) 2373 { 2374 /* Interpret the next argument as an address. */ 2375 CORE_ADDR addr; 2376 2377 if (argv[1] == NULL) 2378 error (_("Missing address argument")); 2379 2380 if (argv[2] != NULL) 2381 error (_("Junk after %s"), argv[1]); 2382 2383 addr = parse_and_eval_address (argv[1]); 2384 2385 for (objfile *objfile : current_program_space->objfiles ()) 2386 { 2387 if ((objfile->flags & OBJF_USERLOADED) != 0 2388 && (objfile->flags & OBJF_SHARED) != 0 2389 && objfile->pspace == pspace 2390 && is_addr_in_objfile (addr, objfile)) 2391 { 2392 objf = objfile; 2393 break; 2394 } 2395 } 2396 } 2397 else if (argv[0] != NULL) 2398 { 2399 /* Interpret the current argument as a file name. */ 2400 2401 if (argv[1] != NULL) 2402 error (_("Junk after %s"), argv[0]); 2403 2404 gdb::unique_xmalloc_ptr<char> filename (tilde_expand (argv[0])); 2405 2406 for (objfile *objfile : current_program_space->objfiles ()) 2407 { 2408 if ((objfile->flags & OBJF_USERLOADED) != 0 2409 && (objfile->flags & OBJF_SHARED) != 0 2410 && objfile->pspace == pspace 2411 && filename_cmp (filename.get (), objfile_name (objfile)) == 0) 2412 { 2413 objf = objfile; 2414 break; 2415 } 2416 } 2417 } 2418 2419 if (objf == NULL) 2420 error (_("No symbol file found")); 2421 2422 if (from_tty 2423 && !query (_("Remove symbol table from file \"%s\"? "), 2424 objfile_name (objf))) 2425 error (_("Not confirmed.")); 2426 2427 objf->unlink (); 2428 clear_symtab_users (0); 2429} 2430 2431/* Re-read symbols if a symbol-file has changed. */ 2432 2433void 2434reread_symbols (void) 2435{ 2436 long new_modtime; 2437 struct stat new_statbuf; 2438 int res; 2439 std::vector<struct objfile *> new_objfiles; 2440 2441 for (objfile *objfile : current_program_space->objfiles ()) 2442 { 2443 if (objfile->obfd == NULL) 2444 continue; 2445 2446 /* Separate debug objfiles are handled in the main objfile. */ 2447 if (objfile->separate_debug_objfile_backlink) 2448 continue; 2449 2450 /* If this object is from an archive (what you usually create with 2451 `ar', often called a `static library' on most systems, though 2452 a `shared library' on AIX is also an archive), then you should 2453 stat on the archive name, not member name. */ 2454 if (objfile->obfd->my_archive) 2455 res = stat (bfd_get_filename (objfile->obfd->my_archive), &new_statbuf); 2456 else 2457 res = stat (objfile_name (objfile), &new_statbuf); 2458 if (res != 0) 2459 { 2460 /* FIXME, should use print_sys_errmsg but it's not filtered. */ 2461 printf_filtered (_("`%s' has disappeared; keeping its symbols.\n"), 2462 objfile_name (objfile)); 2463 continue; 2464 } 2465 new_modtime = new_statbuf.st_mtime; 2466 if (new_modtime != objfile->mtime) 2467 { 2468 printf_filtered (_("`%s' has changed; re-reading symbols.\n"), 2469 objfile_name (objfile)); 2470 2471 /* There are various functions like symbol_file_add, 2472 symfile_bfd_open, syms_from_objfile, etc., which might 2473 appear to do what we want. But they have various other 2474 effects which we *don't* want. So we just do stuff 2475 ourselves. We don't worry about mapped files (for one thing, 2476 any mapped file will be out of date). */ 2477 2478 /* If we get an error, blow away this objfile (not sure if 2479 that is the correct response for things like shared 2480 libraries). */ 2481 objfile_up objfile_holder (objfile); 2482 2483 /* We need to do this whenever any symbols go away. */ 2484 clear_symtab_users_cleanup defer_clear_users (0); 2485 2486 if (exec_bfd != NULL 2487 && filename_cmp (bfd_get_filename (objfile->obfd), 2488 bfd_get_filename (exec_bfd)) == 0) 2489 { 2490 /* Reload EXEC_BFD without asking anything. */ 2491 2492 exec_file_attach (bfd_get_filename (objfile->obfd), 0); 2493 } 2494 2495 /* Keep the calls order approx. the same as in free_objfile. */ 2496 2497 /* Free the separate debug objfiles. It will be 2498 automatically recreated by sym_read. */ 2499 free_objfile_separate_debug (objfile); 2500 2501 /* Clear the stale source cache. */ 2502 forget_cached_source_info (); 2503 2504 /* Remove any references to this objfile in the global 2505 value lists. */ 2506 preserve_values (objfile); 2507 2508 /* Nuke all the state that we will re-read. Much of the following 2509 code which sets things to NULL really is necessary to tell 2510 other parts of GDB that there is nothing currently there. 2511 2512 Try to keep the freeing order compatible with free_objfile. */ 2513 2514 if (objfile->sf != NULL) 2515 { 2516 (*objfile->sf->sym_finish) (objfile); 2517 } 2518 2519 clear_objfile_data (objfile); 2520 2521 /* Clean up any state BFD has sitting around. */ 2522 { 2523 gdb_bfd_ref_ptr obfd (objfile->obfd); 2524 const char *obfd_filename; 2525 2526 obfd_filename = bfd_get_filename (objfile->obfd); 2527 /* Open the new BFD before freeing the old one, so that 2528 the filename remains live. */ 2529 gdb_bfd_ref_ptr temp (gdb_bfd_open (obfd_filename, gnutarget)); 2530 objfile->obfd = temp.release (); 2531 if (objfile->obfd == NULL) 2532 error (_("Can't open %s to read symbols."), obfd_filename); 2533 } 2534 2535 std::string original_name = objfile->original_name; 2536 2537 /* bfd_openr sets cacheable to true, which is what we want. */ 2538 if (!bfd_check_format (objfile->obfd, bfd_object)) 2539 error (_("Can't read symbols from %s: %s."), objfile_name (objfile), 2540 bfd_errmsg (bfd_get_error ())); 2541 2542 objfile->reset_psymtabs (); 2543 2544 /* NB: after this call to obstack_free, objfiles_changed 2545 will need to be called (see discussion below). */ 2546 obstack_free (&objfile->objfile_obstack, 0); 2547 objfile->sections = NULL; 2548 objfile->section_offsets.clear (); 2549 objfile->sect_index_bss = -1; 2550 objfile->sect_index_data = -1; 2551 objfile->sect_index_rodata = -1; 2552 objfile->sect_index_text = -1; 2553 objfile->compunit_symtabs = NULL; 2554 objfile->template_symbols = NULL; 2555 objfile->static_links.reset (nullptr); 2556 2557 /* obstack_init also initializes the obstack so it is 2558 empty. We could use obstack_specify_allocation but 2559 gdb_obstack.h specifies the alloc/dealloc functions. */ 2560 obstack_init (&objfile->objfile_obstack); 2561 2562 /* set_objfile_per_bfd potentially allocates the per-bfd 2563 data on the objfile's obstack (if sharing data across 2564 multiple users is not possible), so it's important to 2565 do it *after* the obstack has been initialized. */ 2566 set_objfile_per_bfd (objfile); 2567 2568 objfile->original_name 2569 = obstack_strdup (&objfile->objfile_obstack, original_name); 2570 2571 /* Reset the sym_fns pointer. The ELF reader can change it 2572 based on whether .gdb_index is present, and we need it to 2573 start over. PR symtab/15885 */ 2574 objfile_set_sym_fns (objfile, find_sym_fns (objfile->obfd)); 2575 2576 build_objfile_section_table (objfile); 2577 2578 /* What the hell is sym_new_init for, anyway? The concept of 2579 distinguishing between the main file and additional files 2580 in this way seems rather dubious. */ 2581 if (objfile == symfile_objfile) 2582 { 2583 (*objfile->sf->sym_new_init) (objfile); 2584 } 2585 2586 (*objfile->sf->sym_init) (objfile); 2587 clear_complaints (); 2588 2589 objfile->flags &= ~OBJF_PSYMTABS_READ; 2590 2591 /* We are about to read new symbols and potentially also 2592 DWARF information. Some targets may want to pass addresses 2593 read from DWARF DIE's through an adjustment function before 2594 saving them, like MIPS, which may call into 2595 "find_pc_section". When called, that function will make 2596 use of per-objfile program space data. 2597 2598 Since we discarded our section information above, we have 2599 dangling pointers in the per-objfile program space data 2600 structure. Force GDB to update the section mapping 2601 information by letting it know the objfile has changed, 2602 making the dangling pointers point to correct data 2603 again. */ 2604 2605 objfiles_changed (); 2606 2607 /* Recompute section offsets and section indices. */ 2608 objfile->sf->sym_offsets (objfile, {}); 2609 2610 read_symbols (objfile, 0); 2611 2612 if (!objfile_has_symbols (objfile)) 2613 { 2614 wrap_here (""); 2615 printf_filtered (_("(no debugging symbols found)\n")); 2616 wrap_here (""); 2617 } 2618 2619 /* We're done reading the symbol file; finish off complaints. */ 2620 clear_complaints (); 2621 2622 /* Getting new symbols may change our opinion about what is 2623 frameless. */ 2624 2625 reinit_frame_cache (); 2626 2627 /* Discard cleanups as symbol reading was successful. */ 2628 objfile_holder.release (); 2629 defer_clear_users.release (); 2630 2631 /* If the mtime has changed between the time we set new_modtime 2632 and now, we *want* this to be out of date, so don't call stat 2633 again now. */ 2634 objfile->mtime = new_modtime; 2635 init_entry_point_info (objfile); 2636 2637 new_objfiles.push_back (objfile); 2638 } 2639 } 2640 2641 if (!new_objfiles.empty ()) 2642 { 2643 clear_symtab_users (0); 2644 2645 /* clear_objfile_data for each objfile was called before freeing it and 2646 gdb::observers::new_objfile.notify (NULL) has been called by 2647 clear_symtab_users above. Notify the new files now. */ 2648 for (auto iter : new_objfiles) 2649 gdb::observers::new_objfile.notify (iter); 2650 2651 /* At least one objfile has changed, so we can consider that 2652 the executable we're debugging has changed too. */ 2653 gdb::observers::executable_changed.notify (); 2654 } 2655} 2656 2657 2658struct filename_language 2659{ 2660 filename_language (const std::string &ext_, enum language lang_) 2661 : ext (ext_), lang (lang_) 2662 {} 2663 2664 std::string ext; 2665 enum language lang; 2666}; 2667 2668static std::vector<filename_language> filename_language_table; 2669 2670/* See symfile.h. */ 2671 2672void 2673add_filename_language (const char *ext, enum language lang) 2674{ 2675 filename_language_table.emplace_back (ext, lang); 2676} 2677 2678static char *ext_args; 2679static void 2680show_ext_args (struct ui_file *file, int from_tty, 2681 struct cmd_list_element *c, const char *value) 2682{ 2683 fprintf_filtered (file, 2684 _("Mapping between filename extension " 2685 "and source language is \"%s\".\n"), 2686 value); 2687} 2688 2689static void 2690set_ext_lang_command (const char *args, 2691 int from_tty, struct cmd_list_element *e) 2692{ 2693 char *cp = ext_args; 2694 enum language lang; 2695 2696 /* First arg is filename extension, starting with '.' */ 2697 if (*cp != '.') 2698 error (_("'%s': Filename extension must begin with '.'"), ext_args); 2699 2700 /* Find end of first arg. */ 2701 while (*cp && !isspace (*cp)) 2702 cp++; 2703 2704 if (*cp == '\0') 2705 error (_("'%s': two arguments required -- " 2706 "filename extension and language"), 2707 ext_args); 2708 2709 /* Null-terminate first arg. */ 2710 *cp++ = '\0'; 2711 2712 /* Find beginning of second arg, which should be a source language. */ 2713 cp = skip_spaces (cp); 2714 2715 if (*cp == '\0') 2716 error (_("'%s': two arguments required -- " 2717 "filename extension and language"), 2718 ext_args); 2719 2720 /* Lookup the language from among those we know. */ 2721 lang = language_enum (cp); 2722 2723 auto it = filename_language_table.begin (); 2724 /* Now lookup the filename extension: do we already know it? */ 2725 for (; it != filename_language_table.end (); it++) 2726 { 2727 if (it->ext == ext_args) 2728 break; 2729 } 2730 2731 if (it == filename_language_table.end ()) 2732 { 2733 /* New file extension. */ 2734 add_filename_language (ext_args, lang); 2735 } 2736 else 2737 { 2738 /* Redefining a previously known filename extension. */ 2739 2740 /* if (from_tty) */ 2741 /* query ("Really make files of type %s '%s'?", */ 2742 /* ext_args, language_str (lang)); */ 2743 2744 it->lang = lang; 2745 } 2746} 2747 2748static void 2749info_ext_lang_command (const char *args, int from_tty) 2750{ 2751 printf_filtered (_("Filename extensions and the languages they represent:")); 2752 printf_filtered ("\n\n"); 2753 for (const filename_language &entry : filename_language_table) 2754 printf_filtered ("\t%s\t- %s\n", entry.ext.c_str (), 2755 language_str (entry.lang)); 2756} 2757 2758enum language 2759deduce_language_from_filename (const char *filename) 2760{ 2761 const char *cp; 2762 2763 if (filename != NULL) 2764 if ((cp = strrchr (filename, '.')) != NULL) 2765 { 2766 for (const filename_language &entry : filename_language_table) 2767 if (entry.ext == cp) 2768 return entry.lang; 2769 } 2770 2771 return language_unknown; 2772} 2773 2774/* Allocate and initialize a new symbol table. 2775 CUST is from the result of allocate_compunit_symtab. */ 2776 2777struct symtab * 2778allocate_symtab (struct compunit_symtab *cust, const char *filename) 2779{ 2780 struct objfile *objfile = cust->objfile; 2781 struct symtab *symtab 2782 = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct symtab); 2783 2784 symtab->filename = objfile->intern (filename); 2785 symtab->fullname = NULL; 2786 symtab->language = deduce_language_from_filename (filename); 2787 2788 /* This can be very verbose with lots of headers. 2789 Only print at higher debug levels. */ 2790 if (symtab_create_debug >= 2) 2791 { 2792 /* Be a bit clever with debugging messages, and don't print objfile 2793 every time, only when it changes. */ 2794 static char *last_objfile_name = NULL; 2795 2796 if (last_objfile_name == NULL 2797 || strcmp (last_objfile_name, objfile_name (objfile)) != 0) 2798 { 2799 xfree (last_objfile_name); 2800 last_objfile_name = xstrdup (objfile_name (objfile)); 2801 fprintf_filtered (gdb_stdlog, 2802 "Creating one or more symtabs for objfile %s ...\n", 2803 last_objfile_name); 2804 } 2805 fprintf_filtered (gdb_stdlog, 2806 "Created symtab %s for module %s.\n", 2807 host_address_to_string (symtab), filename); 2808 } 2809 2810 /* Add it to CUST's list of symtabs. */ 2811 if (cust->filetabs == NULL) 2812 { 2813 cust->filetabs = symtab; 2814 cust->last_filetab = symtab; 2815 } 2816 else 2817 { 2818 cust->last_filetab->next = symtab; 2819 cust->last_filetab = symtab; 2820 } 2821 2822 /* Backlink to the containing compunit symtab. */ 2823 symtab->compunit_symtab = cust; 2824 2825 return symtab; 2826} 2827 2828/* Allocate and initialize a new compunit. 2829 NAME is the name of the main source file, if there is one, or some 2830 descriptive text if there are no source files. */ 2831 2832struct compunit_symtab * 2833allocate_compunit_symtab (struct objfile *objfile, const char *name) 2834{ 2835 struct compunit_symtab *cu = OBSTACK_ZALLOC (&objfile->objfile_obstack, 2836 struct compunit_symtab); 2837 const char *saved_name; 2838 2839 cu->objfile = objfile; 2840 2841 /* The name we record here is only for display/debugging purposes. 2842 Just save the basename to avoid path issues (too long for display, 2843 relative vs absolute, etc.). */ 2844 saved_name = lbasename (name); 2845 cu->name = obstack_strdup (&objfile->objfile_obstack, saved_name); 2846 2847 COMPUNIT_DEBUGFORMAT (cu) = "unknown"; 2848 2849 if (symtab_create_debug) 2850 { 2851 fprintf_filtered (gdb_stdlog, 2852 "Created compunit symtab %s for %s.\n", 2853 host_address_to_string (cu), 2854 cu->name); 2855 } 2856 2857 return cu; 2858} 2859 2860/* Hook CU to the objfile it comes from. */ 2861 2862void 2863add_compunit_symtab_to_objfile (struct compunit_symtab *cu) 2864{ 2865 cu->next = cu->objfile->compunit_symtabs; 2866 cu->objfile->compunit_symtabs = cu; 2867} 2868 2869 2870/* Reset all data structures in gdb which may contain references to 2871 symbol table data. */ 2872 2873void 2874clear_symtab_users (symfile_add_flags add_flags) 2875{ 2876 /* Someday, we should do better than this, by only blowing away 2877 the things that really need to be blown. */ 2878 2879 /* Clear the "current" symtab first, because it is no longer valid. 2880 breakpoint_re_set may try to access the current symtab. */ 2881 clear_current_source_symtab_and_line (); 2882 2883 clear_displays (); 2884 clear_last_displayed_sal (); 2885 clear_pc_function_cache (); 2886 gdb::observers::new_objfile.notify (NULL); 2887 2888 /* Varobj may refer to old symbols, perform a cleanup. */ 2889 varobj_invalidate (); 2890 2891 /* Now that the various caches have been cleared, we can re_set 2892 our breakpoints without risking it using stale data. */ 2893 if ((add_flags & SYMFILE_DEFER_BP_RESET) == 0) 2894 breakpoint_re_set (); 2895} 2896 2897/* OVERLAYS: 2898 The following code implements an abstraction for debugging overlay sections. 2899 2900 The target model is as follows: 2901 1) The gnu linker will permit multiple sections to be mapped into the 2902 same VMA, each with its own unique LMA (or load address). 2903 2) It is assumed that some runtime mechanism exists for mapping the 2904 sections, one by one, from the load address into the VMA address. 2905 3) This code provides a mechanism for gdb to keep track of which 2906 sections should be considered to be mapped from the VMA to the LMA. 2907 This information is used for symbol lookup, and memory read/write. 2908 For instance, if a section has been mapped then its contents 2909 should be read from the VMA, otherwise from the LMA. 2910 2911 Two levels of debugger support for overlays are available. One is 2912 "manual", in which the debugger relies on the user to tell it which 2913 overlays are currently mapped. This level of support is 2914 implemented entirely in the core debugger, and the information about 2915 whether a section is mapped is kept in the objfile->obj_section table. 2916 2917 The second level of support is "automatic", and is only available if 2918 the target-specific code provides functionality to read the target's 2919 overlay mapping table, and translate its contents for the debugger 2920 (by updating the mapped state information in the obj_section tables). 2921 2922 The interface is as follows: 2923 User commands: 2924 overlay map <name> -- tell gdb to consider this section mapped 2925 overlay unmap <name> -- tell gdb to consider this section unmapped 2926 overlay list -- list the sections that GDB thinks are mapped 2927 overlay read-target -- get the target's state of what's mapped 2928 overlay off/manual/auto -- set overlay debugging state 2929 Functional interface: 2930 find_pc_mapped_section(pc): if the pc is in the range of a mapped 2931 section, return that section. 2932 find_pc_overlay(pc): find any overlay section that contains 2933 the pc, either in its VMA or its LMA 2934 section_is_mapped(sect): true if overlay is marked as mapped 2935 section_is_overlay(sect): true if section's VMA != LMA 2936 pc_in_mapped_range(pc,sec): true if pc belongs to section's VMA 2937 pc_in_unmapped_range(...): true if pc belongs to section's LMA 2938 sections_overlap(sec1, sec2): true if mapped sec1 and sec2 ranges overlap 2939 overlay_mapped_address(...): map an address from section's LMA to VMA 2940 overlay_unmapped_address(...): map an address from section's VMA to LMA 2941 symbol_overlayed_address(...): Return a "current" address for symbol: 2942 either in VMA or LMA depending on whether 2943 the symbol's section is currently mapped. */ 2944 2945/* Overlay debugging state: */ 2946 2947enum overlay_debugging_state overlay_debugging = ovly_off; 2948int overlay_cache_invalid = 0; /* True if need to refresh mapped state. */ 2949 2950/* Function: section_is_overlay (SECTION) 2951 Returns true if SECTION has VMA not equal to LMA, ie. 2952 SECTION is loaded at an address different from where it will "run". */ 2953 2954int 2955section_is_overlay (struct obj_section *section) 2956{ 2957 if (overlay_debugging && section) 2958 { 2959 asection *bfd_section = section->the_bfd_section; 2960 2961 if (bfd_section_lma (bfd_section) != 0 2962 && bfd_section_lma (bfd_section) != bfd_section_vma (bfd_section)) 2963 return 1; 2964 } 2965 2966 return 0; 2967} 2968 2969/* Function: overlay_invalidate_all (void) 2970 Invalidate the mapped state of all overlay sections (mark it as stale). */ 2971 2972static void 2973overlay_invalidate_all (void) 2974{ 2975 struct obj_section *sect; 2976 2977 for (objfile *objfile : current_program_space->objfiles ()) 2978 ALL_OBJFILE_OSECTIONS (objfile, sect) 2979 if (section_is_overlay (sect)) 2980 sect->ovly_mapped = -1; 2981} 2982 2983/* Function: section_is_mapped (SECTION) 2984 Returns true if section is an overlay, and is currently mapped. 2985 2986 Access to the ovly_mapped flag is restricted to this function, so 2987 that we can do automatic update. If the global flag 2988 OVERLAY_CACHE_INVALID is set (by wait_for_inferior), then call 2989 overlay_invalidate_all. If the mapped state of the particular 2990 section is stale, then call TARGET_OVERLAY_UPDATE to refresh it. */ 2991 2992int 2993section_is_mapped (struct obj_section *osect) 2994{ 2995 struct gdbarch *gdbarch; 2996 2997 if (osect == 0 || !section_is_overlay (osect)) 2998 return 0; 2999 3000 switch (overlay_debugging) 3001 { 3002 default: 3003 case ovly_off: 3004 return 0; /* overlay debugging off */ 3005 case ovly_auto: /* overlay debugging automatic */ 3006 /* Unles there is a gdbarch_overlay_update function, 3007 there's really nothing useful to do here (can't really go auto). */ 3008 gdbarch = osect->objfile->arch (); 3009 if (gdbarch_overlay_update_p (gdbarch)) 3010 { 3011 if (overlay_cache_invalid) 3012 { 3013 overlay_invalidate_all (); 3014 overlay_cache_invalid = 0; 3015 } 3016 if (osect->ovly_mapped == -1) 3017 gdbarch_overlay_update (gdbarch, osect); 3018 } 3019 /* fall thru */ 3020 case ovly_on: /* overlay debugging manual */ 3021 return osect->ovly_mapped == 1; 3022 } 3023} 3024 3025/* Function: pc_in_unmapped_range 3026 If PC falls into the lma range of SECTION, return true, else false. */ 3027 3028CORE_ADDR 3029pc_in_unmapped_range (CORE_ADDR pc, struct obj_section *section) 3030{ 3031 if (section_is_overlay (section)) 3032 { 3033 asection *bfd_section = section->the_bfd_section; 3034 3035 /* We assume the LMA is relocated by the same offset as the VMA. */ 3036 bfd_vma size = bfd_section_size (bfd_section); 3037 CORE_ADDR offset = obj_section_offset (section); 3038 3039 if (bfd_section_lma (bfd_section) + offset <= pc 3040 && pc < bfd_section_lma (bfd_section) + offset + size) 3041 return 1; 3042 } 3043 3044 return 0; 3045} 3046 3047/* Function: pc_in_mapped_range 3048 If PC falls into the vma range of SECTION, return true, else false. */ 3049 3050CORE_ADDR 3051pc_in_mapped_range (CORE_ADDR pc, struct obj_section *section) 3052{ 3053 if (section_is_overlay (section)) 3054 { 3055 if (obj_section_addr (section) <= pc 3056 && pc < obj_section_endaddr (section)) 3057 return 1; 3058 } 3059 3060 return 0; 3061} 3062 3063/* Return true if the mapped ranges of sections A and B overlap, false 3064 otherwise. */ 3065 3066static int 3067sections_overlap (struct obj_section *a, struct obj_section *b) 3068{ 3069 CORE_ADDR a_start = obj_section_addr (a); 3070 CORE_ADDR a_end = obj_section_endaddr (a); 3071 CORE_ADDR b_start = obj_section_addr (b); 3072 CORE_ADDR b_end = obj_section_endaddr (b); 3073 3074 return (a_start < b_end && b_start < a_end); 3075} 3076 3077/* Function: overlay_unmapped_address (PC, SECTION) 3078 Returns the address corresponding to PC in the unmapped (load) range. 3079 May be the same as PC. */ 3080 3081CORE_ADDR 3082overlay_unmapped_address (CORE_ADDR pc, struct obj_section *section) 3083{ 3084 if (section_is_overlay (section) && pc_in_mapped_range (pc, section)) 3085 { 3086 asection *bfd_section = section->the_bfd_section; 3087 3088 return (pc + bfd_section_lma (bfd_section) 3089 - bfd_section_vma (bfd_section)); 3090 } 3091 3092 return pc; 3093} 3094 3095/* Function: overlay_mapped_address (PC, SECTION) 3096 Returns the address corresponding to PC in the mapped (runtime) range. 3097 May be the same as PC. */ 3098 3099CORE_ADDR 3100overlay_mapped_address (CORE_ADDR pc, struct obj_section *section) 3101{ 3102 if (section_is_overlay (section) && pc_in_unmapped_range (pc, section)) 3103 { 3104 asection *bfd_section = section->the_bfd_section; 3105 3106 return (pc + bfd_section_vma (bfd_section) 3107 - bfd_section_lma (bfd_section)); 3108 } 3109 3110 return pc; 3111} 3112 3113/* Function: symbol_overlayed_address 3114 Return one of two addresses (relative to the VMA or to the LMA), 3115 depending on whether the section is mapped or not. */ 3116 3117CORE_ADDR 3118symbol_overlayed_address (CORE_ADDR address, struct obj_section *section) 3119{ 3120 if (overlay_debugging) 3121 { 3122 /* If the symbol has no section, just return its regular address. */ 3123 if (section == 0) 3124 return address; 3125 /* If the symbol's section is not an overlay, just return its 3126 address. */ 3127 if (!section_is_overlay (section)) 3128 return address; 3129 /* If the symbol's section is mapped, just return its address. */ 3130 if (section_is_mapped (section)) 3131 return address; 3132 /* 3133 * HOWEVER: if the symbol is in an overlay section which is NOT mapped, 3134 * then return its LOADED address rather than its vma address!! 3135 */ 3136 return overlay_unmapped_address (address, section); 3137 } 3138 return address; 3139} 3140 3141/* Function: find_pc_overlay (PC) 3142 Return the best-match overlay section for PC: 3143 If PC matches a mapped overlay section's VMA, return that section. 3144 Else if PC matches an unmapped section's VMA, return that section. 3145 Else if PC matches an unmapped section's LMA, return that section. */ 3146 3147struct obj_section * 3148find_pc_overlay (CORE_ADDR pc) 3149{ 3150 struct obj_section *osect, *best_match = NULL; 3151 3152 if (overlay_debugging) 3153 { 3154 for (objfile *objfile : current_program_space->objfiles ()) 3155 ALL_OBJFILE_OSECTIONS (objfile, osect) 3156 if (section_is_overlay (osect)) 3157 { 3158 if (pc_in_mapped_range (pc, osect)) 3159 { 3160 if (section_is_mapped (osect)) 3161 return osect; 3162 else 3163 best_match = osect; 3164 } 3165 else if (pc_in_unmapped_range (pc, osect)) 3166 best_match = osect; 3167 } 3168 } 3169 return best_match; 3170} 3171 3172/* Function: find_pc_mapped_section (PC) 3173 If PC falls into the VMA address range of an overlay section that is 3174 currently marked as MAPPED, return that section. Else return NULL. */ 3175 3176struct obj_section * 3177find_pc_mapped_section (CORE_ADDR pc) 3178{ 3179 struct obj_section *osect; 3180 3181 if (overlay_debugging) 3182 { 3183 for (objfile *objfile : current_program_space->objfiles ()) 3184 ALL_OBJFILE_OSECTIONS (objfile, osect) 3185 if (pc_in_mapped_range (pc, osect) && section_is_mapped (osect)) 3186 return osect; 3187 } 3188 3189 return NULL; 3190} 3191 3192/* Function: list_overlays_command 3193 Print a list of mapped sections and their PC ranges. */ 3194 3195static void 3196list_overlays_command (const char *args, int from_tty) 3197{ 3198 int nmapped = 0; 3199 struct obj_section *osect; 3200 3201 if (overlay_debugging) 3202 { 3203 for (objfile *objfile : current_program_space->objfiles ()) 3204 ALL_OBJFILE_OSECTIONS (objfile, osect) 3205 if (section_is_mapped (osect)) 3206 { 3207 struct gdbarch *gdbarch = objfile->arch (); 3208 const char *name; 3209 bfd_vma lma, vma; 3210 int size; 3211 3212 vma = bfd_section_vma (osect->the_bfd_section); 3213 lma = bfd_section_lma (osect->the_bfd_section); 3214 size = bfd_section_size (osect->the_bfd_section); 3215 name = bfd_section_name (osect->the_bfd_section); 3216 3217 printf_filtered ("Section %s, loaded at ", name); 3218 fputs_filtered (paddress (gdbarch, lma), gdb_stdout); 3219 puts_filtered (" - "); 3220 fputs_filtered (paddress (gdbarch, lma + size), gdb_stdout); 3221 printf_filtered (", mapped at "); 3222 fputs_filtered (paddress (gdbarch, vma), gdb_stdout); 3223 puts_filtered (" - "); 3224 fputs_filtered (paddress (gdbarch, vma + size), gdb_stdout); 3225 puts_filtered ("\n"); 3226 3227 nmapped++; 3228 } 3229 } 3230 if (nmapped == 0) 3231 printf_filtered (_("No sections are mapped.\n")); 3232} 3233 3234/* Function: map_overlay_command 3235 Mark the named section as mapped (ie. residing at its VMA address). */ 3236 3237static void 3238map_overlay_command (const char *args, int from_tty) 3239{ 3240 struct obj_section *sec, *sec2; 3241 3242 if (!overlay_debugging) 3243 error (_("Overlay debugging not enabled. Use " 3244 "either the 'overlay auto' or\n" 3245 "the 'overlay manual' command.")); 3246 3247 if (args == 0 || *args == 0) 3248 error (_("Argument required: name of an overlay section")); 3249 3250 /* First, find a section matching the user supplied argument. */ 3251 for (objfile *obj_file : current_program_space->objfiles ()) 3252 ALL_OBJFILE_OSECTIONS (obj_file, sec) 3253 if (!strcmp (bfd_section_name (sec->the_bfd_section), args)) 3254 { 3255 /* Now, check to see if the section is an overlay. */ 3256 if (!section_is_overlay (sec)) 3257 continue; /* not an overlay section */ 3258 3259 /* Mark the overlay as "mapped". */ 3260 sec->ovly_mapped = 1; 3261 3262 /* Next, make a pass and unmap any sections that are 3263 overlapped by this new section: */ 3264 for (objfile *objfile2 : current_program_space->objfiles ()) 3265 ALL_OBJFILE_OSECTIONS (objfile2, sec2) 3266 if (sec2->ovly_mapped && sec != sec2 && sections_overlap (sec, 3267 sec2)) 3268 { 3269 if (info_verbose) 3270 printf_unfiltered (_("Note: section %s unmapped by overlap\n"), 3271 bfd_section_name (sec2->the_bfd_section)); 3272 sec2->ovly_mapped = 0; /* sec2 overlaps sec: unmap sec2. */ 3273 } 3274 return; 3275 } 3276 error (_("No overlay section called %s"), args); 3277} 3278 3279/* Function: unmap_overlay_command 3280 Mark the overlay section as unmapped 3281 (ie. resident in its LMA address range, rather than the VMA range). */ 3282 3283static void 3284unmap_overlay_command (const char *args, int from_tty) 3285{ 3286 struct obj_section *sec = NULL; 3287 3288 if (!overlay_debugging) 3289 error (_("Overlay debugging not enabled. " 3290 "Use either the 'overlay auto' or\n" 3291 "the 'overlay manual' command.")); 3292 3293 if (args == 0 || *args == 0) 3294 error (_("Argument required: name of an overlay section")); 3295 3296 /* First, find a section matching the user supplied argument. */ 3297 for (objfile *objfile : current_program_space->objfiles ()) 3298 ALL_OBJFILE_OSECTIONS (objfile, sec) 3299 if (!strcmp (bfd_section_name (sec->the_bfd_section), args)) 3300 { 3301 if (!sec->ovly_mapped) 3302 error (_("Section %s is not mapped"), args); 3303 sec->ovly_mapped = 0; 3304 return; 3305 } 3306 error (_("No overlay section called %s"), args); 3307} 3308 3309/* Function: overlay_auto_command 3310 A utility command to turn on overlay debugging. 3311 Possibly this should be done via a set/show command. */ 3312 3313static void 3314overlay_auto_command (const char *args, int from_tty) 3315{ 3316 overlay_debugging = ovly_auto; 3317 enable_overlay_breakpoints (); 3318 if (info_verbose) 3319 printf_unfiltered (_("Automatic overlay debugging enabled.")); 3320} 3321 3322/* Function: overlay_manual_command 3323 A utility command to turn on overlay debugging. 3324 Possibly this should be done via a set/show command. */ 3325 3326static void 3327overlay_manual_command (const char *args, int from_tty) 3328{ 3329 overlay_debugging = ovly_on; 3330 disable_overlay_breakpoints (); 3331 if (info_verbose) 3332 printf_unfiltered (_("Overlay debugging enabled.")); 3333} 3334 3335/* Function: overlay_off_command 3336 A utility command to turn on overlay debugging. 3337 Possibly this should be done via a set/show command. */ 3338 3339static void 3340overlay_off_command (const char *args, int from_tty) 3341{ 3342 overlay_debugging = ovly_off; 3343 disable_overlay_breakpoints (); 3344 if (info_verbose) 3345 printf_unfiltered (_("Overlay debugging disabled.")); 3346} 3347 3348static void 3349overlay_load_command (const char *args, int from_tty) 3350{ 3351 struct gdbarch *gdbarch = get_current_arch (); 3352 3353 if (gdbarch_overlay_update_p (gdbarch)) 3354 gdbarch_overlay_update (gdbarch, NULL); 3355 else 3356 error (_("This target does not know how to read its overlay state.")); 3357} 3358 3359/* Command list chain containing all defined "overlay" subcommands. */ 3360static struct cmd_list_element *overlaylist; 3361 3362/* Target Overlays for the "Simplest" overlay manager: 3363 3364 This is GDB's default target overlay layer. It works with the 3365 minimal overlay manager supplied as an example by Cygnus. The 3366 entry point is via a function pointer "gdbarch_overlay_update", 3367 so targets that use a different runtime overlay manager can 3368 substitute their own overlay_update function and take over the 3369 function pointer. 3370 3371 The overlay_update function pokes around in the target's data structures 3372 to see what overlays are mapped, and updates GDB's overlay mapping with 3373 this information. 3374 3375 In this simple implementation, the target data structures are as follows: 3376 unsigned _novlys; /# number of overlay sections #/ 3377 unsigned _ovly_table[_novlys][4] = { 3378 {VMA, OSIZE, LMA, MAPPED}, /# one entry per overlay section #/ 3379 {..., ..., ..., ...}, 3380 } 3381 unsigned _novly_regions; /# number of overlay regions #/ 3382 unsigned _ovly_region_table[_novly_regions][3] = { 3383 {VMA, OSIZE, MAPPED_TO_LMA}, /# one entry per overlay region #/ 3384 {..., ..., ...}, 3385 } 3386 These functions will attempt to update GDB's mappedness state in the 3387 symbol section table, based on the target's mappedness state. 3388 3389 To do this, we keep a cached copy of the target's _ovly_table, and 3390 attempt to detect when the cached copy is invalidated. The main 3391 entry point is "simple_overlay_update(SECT), which looks up SECT in 3392 the cached table and re-reads only the entry for that section from 3393 the target (whenever possible). */ 3394 3395/* Cached, dynamically allocated copies of the target data structures: */ 3396static unsigned (*cache_ovly_table)[4] = 0; 3397static unsigned cache_novlys = 0; 3398static CORE_ADDR cache_ovly_table_base = 0; 3399enum ovly_index 3400 { 3401 VMA, OSIZE, LMA, MAPPED 3402 }; 3403 3404/* Throw away the cached copy of _ovly_table. */ 3405 3406static void 3407simple_free_overlay_table (void) 3408{ 3409 xfree (cache_ovly_table); 3410 cache_novlys = 0; 3411 cache_ovly_table = NULL; 3412 cache_ovly_table_base = 0; 3413} 3414 3415/* Read an array of ints of size SIZE from the target into a local buffer. 3416 Convert to host order. int LEN is number of ints. */ 3417 3418static void 3419read_target_long_array (CORE_ADDR memaddr, unsigned int *myaddr, 3420 int len, int size, enum bfd_endian byte_order) 3421{ 3422 /* FIXME (alloca): Not safe if array is very large. */ 3423 gdb_byte *buf = (gdb_byte *) alloca (len * size); 3424 int i; 3425 3426 read_memory (memaddr, buf, len * size); 3427 for (i = 0; i < len; i++) 3428 myaddr[i] = extract_unsigned_integer (size * i + buf, size, byte_order); 3429} 3430 3431/* Find and grab a copy of the target _ovly_table 3432 (and _novlys, which is needed for the table's size). */ 3433 3434static int 3435simple_read_overlay_table (void) 3436{ 3437 struct bound_minimal_symbol novlys_msym; 3438 struct bound_minimal_symbol ovly_table_msym; 3439 struct gdbarch *gdbarch; 3440 int word_size; 3441 enum bfd_endian byte_order; 3442 3443 simple_free_overlay_table (); 3444 novlys_msym = lookup_minimal_symbol ("_novlys", NULL, NULL); 3445 if (! novlys_msym.minsym) 3446 { 3447 error (_("Error reading inferior's overlay table: " 3448 "couldn't find `_novlys' variable\n" 3449 "in inferior. Use `overlay manual' mode.")); 3450 return 0; 3451 } 3452 3453 ovly_table_msym = lookup_bound_minimal_symbol ("_ovly_table"); 3454 if (! ovly_table_msym.minsym) 3455 { 3456 error (_("Error reading inferior's overlay table: couldn't find " 3457 "`_ovly_table' array\n" 3458 "in inferior. Use `overlay manual' mode.")); 3459 return 0; 3460 } 3461 3462 gdbarch = ovly_table_msym.objfile->arch (); 3463 word_size = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT; 3464 byte_order = gdbarch_byte_order (gdbarch); 3465 3466 cache_novlys = read_memory_integer (BMSYMBOL_VALUE_ADDRESS (novlys_msym), 3467 4, byte_order); 3468 cache_ovly_table 3469 = (unsigned int (*)[4]) xmalloc (cache_novlys * sizeof (*cache_ovly_table)); 3470 cache_ovly_table_base = BMSYMBOL_VALUE_ADDRESS (ovly_table_msym); 3471 read_target_long_array (cache_ovly_table_base, 3472 (unsigned int *) cache_ovly_table, 3473 cache_novlys * 4, word_size, byte_order); 3474 3475 return 1; /* SUCCESS */ 3476} 3477 3478/* Function: simple_overlay_update_1 3479 A helper function for simple_overlay_update. Assuming a cached copy 3480 of _ovly_table exists, look through it to find an entry whose vma, 3481 lma and size match those of OSECT. Re-read the entry and make sure 3482 it still matches OSECT (else the table may no longer be valid). 3483 Set OSECT's mapped state to match the entry. Return: 1 for 3484 success, 0 for failure. */ 3485 3486static int 3487simple_overlay_update_1 (struct obj_section *osect) 3488{ 3489 int i; 3490 asection *bsect = osect->the_bfd_section; 3491 struct gdbarch *gdbarch = osect->objfile->arch (); 3492 int word_size = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT; 3493 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); 3494 3495 for (i = 0; i < cache_novlys; i++) 3496 if (cache_ovly_table[i][VMA] == bfd_section_vma (bsect) 3497 && cache_ovly_table[i][LMA] == bfd_section_lma (bsect)) 3498 { 3499 read_target_long_array (cache_ovly_table_base + i * word_size, 3500 (unsigned int *) cache_ovly_table[i], 3501 4, word_size, byte_order); 3502 if (cache_ovly_table[i][VMA] == bfd_section_vma (bsect) 3503 && cache_ovly_table[i][LMA] == bfd_section_lma (bsect)) 3504 { 3505 osect->ovly_mapped = cache_ovly_table[i][MAPPED]; 3506 return 1; 3507 } 3508 else /* Warning! Warning! Target's ovly table has changed! */ 3509 return 0; 3510 } 3511 return 0; 3512} 3513 3514/* Function: simple_overlay_update 3515 If OSECT is NULL, then update all sections' mapped state 3516 (after re-reading the entire target _ovly_table). 3517 If OSECT is non-NULL, then try to find a matching entry in the 3518 cached ovly_table and update only OSECT's mapped state. 3519 If a cached entry can't be found or the cache isn't valid, then 3520 re-read the entire cache, and go ahead and update all sections. */ 3521 3522void 3523simple_overlay_update (struct obj_section *osect) 3524{ 3525 /* Were we given an osect to look up? NULL means do all of them. */ 3526 if (osect) 3527 /* Have we got a cached copy of the target's overlay table? */ 3528 if (cache_ovly_table != NULL) 3529 { 3530 /* Does its cached location match what's currently in the 3531 symtab? */ 3532 struct bound_minimal_symbol minsym 3533 = lookup_minimal_symbol ("_ovly_table", NULL, NULL); 3534 3535 if (minsym.minsym == NULL) 3536 error (_("Error reading inferior's overlay table: couldn't " 3537 "find `_ovly_table' array\n" 3538 "in inferior. Use `overlay manual' mode.")); 3539 3540 if (cache_ovly_table_base == BMSYMBOL_VALUE_ADDRESS (minsym)) 3541 /* Then go ahead and try to look up this single section in 3542 the cache. */ 3543 if (simple_overlay_update_1 (osect)) 3544 /* Found it! We're done. */ 3545 return; 3546 } 3547 3548 /* Cached table no good: need to read the entire table anew. 3549 Or else we want all the sections, in which case it's actually 3550 more efficient to read the whole table in one block anyway. */ 3551 3552 if (! simple_read_overlay_table ()) 3553 return; 3554 3555 /* Now may as well update all sections, even if only one was requested. */ 3556 for (objfile *objfile : current_program_space->objfiles ()) 3557 ALL_OBJFILE_OSECTIONS (objfile, osect) 3558 if (section_is_overlay (osect)) 3559 { 3560 int i; 3561 asection *bsect = osect->the_bfd_section; 3562 3563 for (i = 0; i < cache_novlys; i++) 3564 if (cache_ovly_table[i][VMA] == bfd_section_vma (bsect) 3565 && cache_ovly_table[i][LMA] == bfd_section_lma (bsect)) 3566 { /* obj_section matches i'th entry in ovly_table. */ 3567 osect->ovly_mapped = cache_ovly_table[i][MAPPED]; 3568 break; /* finished with inner for loop: break out. */ 3569 } 3570 } 3571} 3572 3573/* Set the output sections and output offsets for section SECTP in 3574 ABFD. The relocation code in BFD will read these offsets, so we 3575 need to be sure they're initialized. We map each section to itself, 3576 with no offset; this means that SECTP->vma will be honored. */ 3577 3578static void 3579symfile_dummy_outputs (bfd *abfd, asection *sectp, void *dummy) 3580{ 3581 sectp->output_section = sectp; 3582 sectp->output_offset = 0; 3583} 3584 3585/* Default implementation for sym_relocate. */ 3586 3587bfd_byte * 3588default_symfile_relocate (struct objfile *objfile, asection *sectp, 3589 bfd_byte *buf) 3590{ 3591 /* Use sectp->owner instead of objfile->obfd. sectp may point to a 3592 DWO file. */ 3593 bfd *abfd = sectp->owner; 3594 3595 /* We're only interested in sections with relocation 3596 information. */ 3597 if ((sectp->flags & SEC_RELOC) == 0) 3598 return NULL; 3599 3600 /* We will handle section offsets properly elsewhere, so relocate as if 3601 all sections begin at 0. */ 3602 bfd_map_over_sections (abfd, symfile_dummy_outputs, NULL); 3603 3604 return bfd_simple_get_relocated_section_contents (abfd, sectp, buf, NULL); 3605} 3606 3607/* Relocate the contents of a debug section SECTP in ABFD. The 3608 contents are stored in BUF if it is non-NULL, or returned in a 3609 malloc'd buffer otherwise. 3610 3611 For some platforms and debug info formats, shared libraries contain 3612 relocations against the debug sections (particularly for DWARF-2; 3613 one affected platform is PowerPC GNU/Linux, although it depends on 3614 the version of the linker in use). Also, ELF object files naturally 3615 have unresolved relocations for their debug sections. We need to apply 3616 the relocations in order to get the locations of symbols correct. 3617 Another example that may require relocation processing, is the 3618 DWARF-2 .eh_frame section in .o files, although it isn't strictly a 3619 debug section. */ 3620 3621bfd_byte * 3622symfile_relocate_debug_section (struct objfile *objfile, 3623 asection *sectp, bfd_byte *buf) 3624{ 3625 gdb_assert (objfile->sf->sym_relocate); 3626 3627 return (*objfile->sf->sym_relocate) (objfile, sectp, buf); 3628} 3629 3630symfile_segment_data_up 3631get_symfile_segment_data (bfd *abfd) 3632{ 3633 const struct sym_fns *sf = find_sym_fns (abfd); 3634 3635 if (sf == NULL) 3636 return NULL; 3637 3638 return sf->sym_segments (abfd); 3639} 3640 3641/* Given: 3642 - DATA, containing segment addresses from the object file ABFD, and 3643 the mapping from ABFD's sections onto the segments that own them, 3644 and 3645 - SEGMENT_BASES[0 .. NUM_SEGMENT_BASES - 1], holding the actual 3646 segment addresses reported by the target, 3647 store the appropriate offsets for each section in OFFSETS. 3648 3649 If there are fewer entries in SEGMENT_BASES than there are segments 3650 in DATA, then apply SEGMENT_BASES' last entry to all the segments. 3651 3652 If there are more entries, then ignore the extra. The target may 3653 not be able to distinguish between an empty data segment and a 3654 missing data segment; a missing text segment is less plausible. */ 3655 3656int 3657symfile_map_offsets_to_segments (bfd *abfd, 3658 const struct symfile_segment_data *data, 3659 section_offsets &offsets, 3660 int num_segment_bases, 3661 const CORE_ADDR *segment_bases) 3662{ 3663 int i; 3664 asection *sect; 3665 3666 /* It doesn't make sense to call this function unless you have some 3667 segment base addresses. */ 3668 gdb_assert (num_segment_bases > 0); 3669 3670 /* If we do not have segment mappings for the object file, we 3671 can not relocate it by segments. */ 3672 gdb_assert (data != NULL); 3673 gdb_assert (data->segments.size () > 0); 3674 3675 for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next) 3676 { 3677 int which = data->segment_info[i]; 3678 3679 gdb_assert (0 <= which && which <= data->segments.size ()); 3680 3681 /* Don't bother computing offsets for sections that aren't 3682 loaded as part of any segment. */ 3683 if (! which) 3684 continue; 3685 3686 /* Use the last SEGMENT_BASES entry as the address of any extra 3687 segments mentioned in DATA->segment_info. */ 3688 if (which > num_segment_bases) 3689 which = num_segment_bases; 3690 3691 offsets[i] = segment_bases[which - 1] - data->segments[which - 1].base; 3692 } 3693 3694 return 1; 3695} 3696 3697static void 3698symfile_find_segment_sections (struct objfile *objfile) 3699{ 3700 bfd *abfd = objfile->obfd; 3701 int i; 3702 asection *sect; 3703 3704 symfile_segment_data_up data 3705 = get_symfile_segment_data (objfile->obfd); 3706 if (data == NULL) 3707 return; 3708 3709 if (data->segments.size () != 1 && data->segments.size () != 2) 3710 return; 3711 3712 for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next) 3713 { 3714 int which = data->segment_info[i]; 3715 3716 if (which == 1) 3717 { 3718 if (objfile->sect_index_text == -1) 3719 objfile->sect_index_text = sect->index; 3720 3721 if (objfile->sect_index_rodata == -1) 3722 objfile->sect_index_rodata = sect->index; 3723 } 3724 else if (which == 2) 3725 { 3726 if (objfile->sect_index_data == -1) 3727 objfile->sect_index_data = sect->index; 3728 3729 if (objfile->sect_index_bss == -1) 3730 objfile->sect_index_bss = sect->index; 3731 } 3732 } 3733} 3734 3735/* Listen for free_objfile events. */ 3736 3737static void 3738symfile_free_objfile (struct objfile *objfile) 3739{ 3740 /* Remove the target sections owned by this objfile. */ 3741 if (objfile != NULL) 3742 remove_target_sections ((void *) objfile); 3743} 3744 3745/* Wrapper around the quick_symbol_functions expand_symtabs_matching "method". 3746 Expand all symtabs that match the specified criteria. 3747 See quick_symbol_functions.expand_symtabs_matching for details. */ 3748 3749void 3750expand_symtabs_matching 3751 (gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher, 3752 const lookup_name_info &lookup_name, 3753 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher, 3754 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify, 3755 enum search_domain kind) 3756{ 3757 for (objfile *objfile : current_program_space->objfiles ()) 3758 { 3759 if (objfile->sf) 3760 objfile->sf->qf->expand_symtabs_matching (objfile, file_matcher, 3761 &lookup_name, 3762 symbol_matcher, 3763 expansion_notify, kind); 3764 } 3765} 3766 3767/* Wrapper around the quick_symbol_functions map_symbol_filenames "method". 3768 Map function FUN over every file. 3769 See quick_symbol_functions.map_symbol_filenames for details. */ 3770 3771void 3772map_symbol_filenames (symbol_filename_ftype *fun, void *data, 3773 int need_fullname) 3774{ 3775 for (objfile *objfile : current_program_space->objfiles ()) 3776 { 3777 if (objfile->sf) 3778 objfile->sf->qf->map_symbol_filenames (objfile, fun, data, 3779 need_fullname); 3780 } 3781} 3782 3783#if GDB_SELF_TEST 3784 3785namespace selftests { 3786namespace filename_language { 3787 3788static void test_filename_language () 3789{ 3790 /* This test messes up the filename_language_table global. */ 3791 scoped_restore restore_flt = make_scoped_restore (&filename_language_table); 3792 3793 /* Test deducing an unknown extension. */ 3794 language lang = deduce_language_from_filename ("myfile.blah"); 3795 SELF_CHECK (lang == language_unknown); 3796 3797 /* Test deducing a known extension. */ 3798 lang = deduce_language_from_filename ("myfile.c"); 3799 SELF_CHECK (lang == language_c); 3800 3801 /* Test adding a new extension using the internal API. */ 3802 add_filename_language (".blah", language_pascal); 3803 lang = deduce_language_from_filename ("myfile.blah"); 3804 SELF_CHECK (lang == language_pascal); 3805} 3806 3807static void 3808test_set_ext_lang_command () 3809{ 3810 /* This test messes up the filename_language_table global. */ 3811 scoped_restore restore_flt = make_scoped_restore (&filename_language_table); 3812 3813 /* Confirm that the .hello extension is not known. */ 3814 language lang = deduce_language_from_filename ("cake.hello"); 3815 SELF_CHECK (lang == language_unknown); 3816 3817 /* Test adding a new extension using the CLI command. */ 3818 auto args_holder = make_unique_xstrdup (".hello rust"); 3819 ext_args = args_holder.get (); 3820 set_ext_lang_command (NULL, 1, NULL); 3821 3822 lang = deduce_language_from_filename ("cake.hello"); 3823 SELF_CHECK (lang == language_rust); 3824 3825 /* Test overriding an existing extension using the CLI command. */ 3826 int size_before = filename_language_table.size (); 3827 args_holder.reset (xstrdup (".hello pascal")); 3828 ext_args = args_holder.get (); 3829 set_ext_lang_command (NULL, 1, NULL); 3830 int size_after = filename_language_table.size (); 3831 3832 lang = deduce_language_from_filename ("cake.hello"); 3833 SELF_CHECK (lang == language_pascal); 3834 SELF_CHECK (size_before == size_after); 3835} 3836 3837} /* namespace filename_language */ 3838} /* namespace selftests */ 3839 3840#endif /* GDB_SELF_TEST */ 3841 3842void _initialize_symfile (); 3843void 3844_initialize_symfile () 3845{ 3846 struct cmd_list_element *c; 3847 3848 gdb::observers::free_objfile.attach (symfile_free_objfile); 3849 3850#define READNOW_READNEVER_HELP \ 3851 "The '-readnow' option will cause GDB to read the entire symbol file\n\ 3852immediately. This makes the command slower, but may make future operations\n\ 3853faster.\n\ 3854The '-readnever' option will prevent GDB from reading the symbol file's\n\ 3855symbolic debug information." 3856 3857 c = add_cmd ("symbol-file", class_files, symbol_file_command, _("\ 3858Load symbol table from executable file FILE.\n\ 3859Usage: symbol-file [-readnow | -readnever] [-o OFF] FILE\n\ 3860OFF is an optional offset which is added to each section address.\n\ 3861The `file' command can also load symbol tables, as well as setting the file\n\ 3862to execute.\n" READNOW_READNEVER_HELP), &cmdlist); 3863 set_cmd_completer (c, filename_completer); 3864 3865 c = add_cmd ("add-symbol-file", class_files, add_symbol_file_command, _("\ 3866Load symbols from FILE, assuming FILE has been dynamically loaded.\n\ 3867Usage: add-symbol-file FILE [-readnow | -readnever] [-o OFF] [ADDR] \ 3868[-s SECT-NAME SECT-ADDR]...\n\ 3869ADDR is the starting address of the file's text.\n\ 3870Each '-s' argument provides a section name and address, and\n\ 3871should be specified if the data and bss segments are not contiguous\n\ 3872with the text. SECT-NAME is a section name to be loaded at SECT-ADDR.\n\ 3873OFF is an optional offset which is added to the default load addresses\n\ 3874of all sections for which no other address was specified.\n" 3875READNOW_READNEVER_HELP), 3876 &cmdlist); 3877 set_cmd_completer (c, filename_completer); 3878 3879 c = add_cmd ("remove-symbol-file", class_files, 3880 remove_symbol_file_command, _("\ 3881Remove a symbol file added via the add-symbol-file command.\n\ 3882Usage: remove-symbol-file FILENAME\n\ 3883 remove-symbol-file -a ADDRESS\n\ 3884The file to remove can be identified by its filename or by an address\n\ 3885that lies within the boundaries of this symbol file in memory."), 3886 &cmdlist); 3887 3888 c = add_cmd ("load", class_files, load_command, _("\ 3889Dynamically load FILE into the running program.\n\ 3890FILE symbols are recorded for access from GDB.\n\ 3891Usage: load [FILE] [OFFSET]\n\ 3892An optional load OFFSET may also be given as a literal address.\n\ 3893When OFFSET is provided, FILE must also be provided. FILE can be provided\n\ 3894on its own."), &cmdlist); 3895 set_cmd_completer (c, filename_completer); 3896 3897 add_basic_prefix_cmd ("overlay", class_support, 3898 _("Commands for debugging overlays."), &overlaylist, 3899 "overlay ", 0, &cmdlist); 3900 3901 add_com_alias ("ovly", "overlay", class_support, 1); 3902 add_com_alias ("ov", "overlay", class_support, 1); 3903 3904 add_cmd ("map-overlay", class_support, map_overlay_command, 3905 _("Assert that an overlay section is mapped."), &overlaylist); 3906 3907 add_cmd ("unmap-overlay", class_support, unmap_overlay_command, 3908 _("Assert that an overlay section is unmapped."), &overlaylist); 3909 3910 add_cmd ("list-overlays", class_support, list_overlays_command, 3911 _("List mappings of overlay sections."), &overlaylist); 3912 3913 add_cmd ("manual", class_support, overlay_manual_command, 3914 _("Enable overlay debugging."), &overlaylist); 3915 add_cmd ("off", class_support, overlay_off_command, 3916 _("Disable overlay debugging."), &overlaylist); 3917 add_cmd ("auto", class_support, overlay_auto_command, 3918 _("Enable automatic overlay debugging."), &overlaylist); 3919 add_cmd ("load-target", class_support, overlay_load_command, 3920 _("Read the overlay mapping state from the target."), &overlaylist); 3921 3922 /* Filename extension to source language lookup table: */ 3923 add_setshow_string_noescape_cmd ("extension-language", class_files, 3924 &ext_args, _("\ 3925Set mapping between filename extension and source language."), _("\ 3926Show mapping between filename extension and source language."), _("\ 3927Usage: set extension-language .foo bar"), 3928 set_ext_lang_command, 3929 show_ext_args, 3930 &setlist, &showlist); 3931 3932 add_info ("extensions", info_ext_lang_command, 3933 _("All filename extensions associated with a source language.")); 3934 3935 add_setshow_optional_filename_cmd ("debug-file-directory", class_support, 3936 &debug_file_directory, _("\ 3937Set the directories where separate debug symbols are searched for."), _("\ 3938Show the directories where separate debug symbols are searched for."), _("\ 3939Separate debug symbols are first searched for in the same\n\ 3940directory as the binary, then in the `" DEBUG_SUBDIRECTORY "' subdirectory,\n\ 3941and lastly at the path of the directory of the binary with\n\ 3942each global debug-file-directory component prepended."), 3943 NULL, 3944 show_debug_file_directory, 3945 &setlist, &showlist); 3946 3947 add_setshow_enum_cmd ("symbol-loading", no_class, 3948 print_symbol_loading_enums, &print_symbol_loading, 3949 _("\ 3950Set printing of symbol loading messages."), _("\ 3951Show printing of symbol loading messages."), _("\ 3952off == turn all messages off\n\ 3953brief == print messages for the executable,\n\ 3954 and brief messages for shared libraries\n\ 3955full == print messages for the executable,\n\ 3956 and messages for each shared library."), 3957 NULL, 3958 NULL, 3959 &setprintlist, &showprintlist); 3960 3961 add_setshow_boolean_cmd ("separate-debug-file", no_class, 3962 &separate_debug_file_debug, _("\ 3963Set printing of separate debug info file search debug."), _("\ 3964Show printing of separate debug info file search debug."), _("\ 3965When on, GDB prints the searched locations while looking for separate debug \ 3966info files."), NULL, NULL, &setdebuglist, &showdebuglist); 3967 3968#if GDB_SELF_TEST 3969 selftests::register_test 3970 ("filename_language", selftests::filename_language::test_filename_language); 3971 selftests::register_test 3972 ("set_ext_lang_command", 3973 selftests::filename_language::test_set_ext_lang_command); 3974#endif 3975} 3976