objfiles.c revision 98948
1/* GDB routines for manipulating objfiles. 2 Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001 3 Free Software Foundation, Inc. 4 Contributed by Cygnus Support, using pieces from other GDB modules. 5 6 This file is part of GDB. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 2 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 59 Temple Place - Suite 330, 21 Boston, MA 02111-1307, USA. */ 22 23/* This file contains support routines for creating, manipulating, and 24 destroying objfile structures. */ 25 26#include "defs.h" 27#include "bfd.h" /* Binary File Description */ 28#include "symtab.h" 29#include "symfile.h" 30#include "objfiles.h" 31#include "gdb-stabs.h" 32#include "target.h" 33 34#include <sys/types.h> 35#include "gdb_stat.h" 36#include <fcntl.h> 37#include "obstack.h" 38#include "gdb_string.h" 39 40#include "breakpoint.h" 41 42/* Prototypes for local functions */ 43 44#if defined(USE_MMALLOC) && defined(HAVE_MMAP) 45 46#include "mmalloc.h" 47 48static int open_existing_mapped_file (char *, long, int); 49 50static int open_mapped_file (char *filename, long mtime, int flags); 51 52static PTR map_to_file (int); 53 54#endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */ 55 56static void add_to_objfile_sections (bfd *, sec_ptr, PTR); 57 58/* Externally visible variables that are owned by this module. 59 See declarations in objfile.h for more info. */ 60 61struct objfile *object_files; /* Linked list of all objfiles */ 62struct objfile *current_objfile; /* For symbol file being read in */ 63struct objfile *symfile_objfile; /* Main symbol table loaded from */ 64struct objfile *rt_common_objfile; /* For runtime common symbols */ 65 66int mapped_symbol_files; /* Try to use mapped symbol files */ 67 68/* Locate all mappable sections of a BFD file. 69 objfile_p_char is a char * to get it through 70 bfd_map_over_sections; we cast it back to its proper type. */ 71 72#ifndef TARGET_KEEP_SECTION 73#define TARGET_KEEP_SECTION(ASECT) 0 74#endif 75 76/* Called via bfd_map_over_sections to build up the section table that 77 the objfile references. The objfile contains pointers to the start 78 of the table (objfile->sections) and to the first location after 79 the end of the table (objfile->sections_end). */ 80 81static void 82add_to_objfile_sections (bfd *abfd, sec_ptr asect, PTR objfile_p_char) 83{ 84 struct objfile *objfile = (struct objfile *) objfile_p_char; 85 struct obj_section section; 86 flagword aflag; 87 88 aflag = bfd_get_section_flags (abfd, asect); 89 90 if (!(aflag & SEC_ALLOC) && !(TARGET_KEEP_SECTION (asect))) 91 return; 92 93 if (0 == bfd_section_size (abfd, asect)) 94 return; 95 section.offset = 0; 96 section.objfile = objfile; 97 section.the_bfd_section = asect; 98 section.ovly_mapped = 0; 99 section.addr = bfd_section_vma (abfd, asect); 100 section.endaddr = section.addr + bfd_section_size (abfd, asect); 101 obstack_grow (&objfile->psymbol_obstack, (char *) §ion, sizeof (section)); 102 objfile->sections_end = (struct obj_section *) (((unsigned long) objfile->sections_end) + 1); 103} 104 105/* Builds a section table for OBJFILE. 106 Returns 0 if OK, 1 on error (in which case bfd_error contains the 107 error). 108 109 Note that while we are building the table, which goes into the 110 psymbol obstack, we hijack the sections_end pointer to instead hold 111 a count of the number of sections. When bfd_map_over_sections 112 returns, this count is used to compute the pointer to the end of 113 the sections table, which then overwrites the count. 114 115 Also note that the OFFSET and OVLY_MAPPED in each table entry 116 are initialized to zero. 117 118 Also note that if anything else writes to the psymbol obstack while 119 we are building the table, we're pretty much hosed. */ 120 121int 122build_objfile_section_table (struct objfile *objfile) 123{ 124 /* objfile->sections can be already set when reading a mapped symbol 125 file. I believe that we do need to rebuild the section table in 126 this case (we rebuild other things derived from the bfd), but we 127 can't free the old one (it's in the psymbol_obstack). So we just 128 waste some memory. */ 129 130 objfile->sections_end = 0; 131 bfd_map_over_sections (objfile->obfd, add_to_objfile_sections, (char *) objfile); 132 objfile->sections = (struct obj_section *) 133 obstack_finish (&objfile->psymbol_obstack); 134 objfile->sections_end = objfile->sections + (unsigned long) objfile->sections_end; 135 return (0); 136} 137 138/* Given a pointer to an initialized bfd (ABFD) and some flag bits 139 allocate a new objfile struct, fill it in as best we can, link it 140 into the list of all known objfiles, and return a pointer to the 141 new objfile struct. 142 143 The FLAGS word contains various bits (OBJF_*) that can be taken as 144 requests for specific operations, like trying to open a mapped 145 version of the objfile (OBJF_MAPPED). Other bits like 146 OBJF_SHARED are simply copied through to the new objfile flags 147 member. */ 148 149struct objfile * 150allocate_objfile (bfd *abfd, int flags) 151{ 152 struct objfile *objfile = NULL; 153 struct objfile *last_one = NULL; 154 155 if (mapped_symbol_files) 156 flags |= OBJF_MAPPED; 157 158#if defined(USE_MMALLOC) && defined(HAVE_MMAP) 159 if (abfd != NULL) 160 { 161 162 /* If we can support mapped symbol files, try to open/reopen the 163 mapped file that corresponds to the file from which we wish to 164 read symbols. If the objfile is to be mapped, we must malloc 165 the structure itself using the mmap version, and arrange that 166 all memory allocation for the objfile uses the mmap routines. 167 If we are reusing an existing mapped file, from which we get 168 our objfile pointer, we have to make sure that we update the 169 pointers to the alloc/free functions in the obstack, in case 170 these functions have moved within the current gdb. */ 171 172 int fd; 173 174 fd = open_mapped_file (bfd_get_filename (abfd), bfd_get_mtime (abfd), 175 flags); 176 if (fd >= 0) 177 { 178 PTR md; 179 180 if ((md = map_to_file (fd)) == NULL) 181 { 182 close (fd); 183 } 184 else if ((objfile = (struct objfile *) mmalloc_getkey (md, 0)) != NULL) 185 { 186 /* Update memory corruption handler function addresses. */ 187 init_malloc (md); 188 objfile->md = md; 189 objfile->mmfd = fd; 190 /* Update pointers to functions to *our* copies */ 191 obstack_chunkfun (&objfile->psymbol_cache.cache, xmmalloc); 192 obstack_freefun (&objfile->psymbol_cache.cache, xmfree); 193 obstack_chunkfun (&objfile->psymbol_obstack, xmmalloc); 194 obstack_freefun (&objfile->psymbol_obstack, xmfree); 195 obstack_chunkfun (&objfile->symbol_obstack, xmmalloc); 196 obstack_freefun (&objfile->symbol_obstack, xmfree); 197 obstack_chunkfun (&objfile->type_obstack, xmmalloc); 198 obstack_freefun (&objfile->type_obstack, xmfree); 199 /* If already in objfile list, unlink it. */ 200 unlink_objfile (objfile); 201 /* Forget things specific to a particular gdb, may have changed. */ 202 objfile->sf = NULL; 203 } 204 else 205 { 206 207 /* Set up to detect internal memory corruption. MUST be 208 done before the first malloc. See comments in 209 init_malloc() and mmcheck(). */ 210 211 init_malloc (md); 212 213 objfile = (struct objfile *) 214 xmmalloc (md, sizeof (struct objfile)); 215 memset (objfile, 0, sizeof (struct objfile)); 216 objfile->md = md; 217 objfile->mmfd = fd; 218 objfile->flags |= OBJF_MAPPED; 219 mmalloc_setkey (objfile->md, 0, objfile); 220 obstack_specify_allocation_with_arg (&objfile->psymbol_cache.cache, 221 0, 0, xmmalloc, xmfree, 222 objfile->md); 223 obstack_specify_allocation_with_arg (&objfile->psymbol_obstack, 224 0, 0, xmmalloc, xmfree, 225 objfile->md); 226 obstack_specify_allocation_with_arg (&objfile->symbol_obstack, 227 0, 0, xmmalloc, xmfree, 228 objfile->md); 229 obstack_specify_allocation_with_arg (&objfile->type_obstack, 230 0, 0, xmmalloc, xmfree, 231 objfile->md); 232 } 233 } 234 235 if ((flags & OBJF_MAPPED) && (objfile == NULL)) 236 { 237 warning ("symbol table for '%s' will not be mapped", 238 bfd_get_filename (abfd)); 239 flags &= ~OBJF_MAPPED; 240 } 241 } 242#else /* !defined(USE_MMALLOC) || !defined(HAVE_MMAP) */ 243 244 if (flags & OBJF_MAPPED) 245 { 246 warning ("mapped symbol tables are not supported on this machine; missing or broken mmap()."); 247 248 /* Turn off the global flag so we don't try to do mapped symbol tables 249 any more, which shuts up gdb unless the user specifically gives the 250 "mapped" keyword again. */ 251 252 mapped_symbol_files = 0; 253 flags &= ~OBJF_MAPPED; 254 } 255 256#endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */ 257 258 /* If we don't support mapped symbol files, didn't ask for the file to be 259 mapped, or failed to open the mapped file for some reason, then revert 260 back to an unmapped objfile. */ 261 262 if (objfile == NULL) 263 { 264 objfile = (struct objfile *) xmalloc (sizeof (struct objfile)); 265 memset (objfile, 0, sizeof (struct objfile)); 266 objfile->md = NULL; 267 obstack_specify_allocation (&objfile->psymbol_cache.cache, 0, 0, 268 xmalloc, xfree); 269 obstack_specify_allocation (&objfile->psymbol_obstack, 0, 0, xmalloc, 270 xfree); 271 obstack_specify_allocation (&objfile->symbol_obstack, 0, 0, xmalloc, 272 xfree); 273 obstack_specify_allocation (&objfile->type_obstack, 0, 0, xmalloc, 274 xfree); 275 flags &= ~OBJF_MAPPED; 276 } 277 278 /* Update the per-objfile information that comes from the bfd, ensuring 279 that any data that is reference is saved in the per-objfile data 280 region. */ 281 282 objfile->obfd = abfd; 283 if (objfile->name != NULL) 284 { 285 xmfree (objfile->md, objfile->name); 286 } 287 if (abfd != NULL) 288 { 289 objfile->name = mstrsave (objfile->md, bfd_get_filename (abfd)); 290 objfile->mtime = bfd_get_mtime (abfd); 291 292 /* Build section table. */ 293 294 if (build_objfile_section_table (objfile)) 295 { 296 error ("Can't find the file sections in `%s': %s", 297 objfile->name, bfd_errmsg (bfd_get_error ())); 298 } 299 } 300 301 /* Initialize the section indexes for this objfile, so that we can 302 later detect if they are used w/o being properly assigned to. */ 303 304 objfile->sect_index_text = -1; 305 objfile->sect_index_data = -1; 306 objfile->sect_index_bss = -1; 307 objfile->sect_index_rodata = -1; 308 309 /* Add this file onto the tail of the linked list of other such files. */ 310 311 objfile->next = NULL; 312 if (object_files == NULL) 313 object_files = objfile; 314 else 315 { 316 for (last_one = object_files; 317 last_one->next; 318 last_one = last_one->next); 319 last_one->next = objfile; 320 } 321 322 /* Save passed in flag bits. */ 323 objfile->flags |= flags; 324 325 return (objfile); 326} 327 328/* Put OBJFILE at the front of the list. */ 329 330void 331objfile_to_front (struct objfile *objfile) 332{ 333 struct objfile **objp; 334 for (objp = &object_files; *objp != NULL; objp = &((*objp)->next)) 335 { 336 if (*objp == objfile) 337 { 338 /* Unhook it from where it is. */ 339 *objp = objfile->next; 340 /* Put it in the front. */ 341 objfile->next = object_files; 342 object_files = objfile; 343 break; 344 } 345 } 346} 347 348/* Unlink OBJFILE from the list of known objfiles, if it is found in the 349 list. 350 351 It is not a bug, or error, to call this function if OBJFILE is not known 352 to be in the current list. This is done in the case of mapped objfiles, 353 for example, just to ensure that the mapped objfile doesn't appear twice 354 in the list. Since the list is threaded, linking in a mapped objfile 355 twice would create a circular list. 356 357 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after 358 unlinking it, just to ensure that we have completely severed any linkages 359 between the OBJFILE and the list. */ 360 361void 362unlink_objfile (struct objfile *objfile) 363{ 364 struct objfile **objpp; 365 366 for (objpp = &object_files; *objpp != NULL; objpp = &((*objpp)->next)) 367 { 368 if (*objpp == objfile) 369 { 370 *objpp = (*objpp)->next; 371 objfile->next = NULL; 372 return; 373 } 374 } 375 376 internal_error (__FILE__, __LINE__, 377 "unlink_objfile: objfile already unlinked"); 378} 379 380 381/* Destroy an objfile and all the symtabs and psymtabs under it. Note 382 that as much as possible is allocated on the symbol_obstack and 383 psymbol_obstack, so that the memory can be efficiently freed. 384 385 Things which we do NOT free because they are not in malloc'd memory 386 or not in memory specific to the objfile include: 387 388 objfile -> sf 389 390 FIXME: If the objfile is using reusable symbol information (via mmalloc), 391 then we need to take into account the fact that more than one process 392 may be using the symbol information at the same time (when mmalloc is 393 extended to support cooperative locking). When more than one process 394 is using the mapped symbol info, we need to be more careful about when 395 we free objects in the reusable area. */ 396 397void 398free_objfile (struct objfile *objfile) 399{ 400 /* First do any symbol file specific actions required when we are 401 finished with a particular symbol file. Note that if the objfile 402 is using reusable symbol information (via mmalloc) then each of 403 these routines is responsible for doing the correct thing, either 404 freeing things which are valid only during this particular gdb 405 execution, or leaving them to be reused during the next one. */ 406 407 if (objfile->sf != NULL) 408 { 409 (*objfile->sf->sym_finish) (objfile); 410 } 411 412 /* We always close the bfd. */ 413 414 if (objfile->obfd != NULL) 415 { 416 char *name = bfd_get_filename (objfile->obfd); 417 if (!bfd_close (objfile->obfd)) 418 warning ("cannot close \"%s\": %s", 419 name, bfd_errmsg (bfd_get_error ())); 420 xfree (name); 421 } 422 423 /* Remove it from the chain of all objfiles. */ 424 425 unlink_objfile (objfile); 426 427 /* If we are going to free the runtime common objfile, mark it 428 as unallocated. */ 429 430 if (objfile == rt_common_objfile) 431 rt_common_objfile = NULL; 432 433 /* Before the symbol table code was redone to make it easier to 434 selectively load and remove information particular to a specific 435 linkage unit, gdb used to do these things whenever the monolithic 436 symbol table was blown away. How much still needs to be done 437 is unknown, but we play it safe for now and keep each action until 438 it is shown to be no longer needed. */ 439 440 /* I *think* all our callers call clear_symtab_users. If so, no need 441 to call this here. */ 442 clear_pc_function_cache (); 443 444 /* The last thing we do is free the objfile struct itself for the 445 non-reusable case, or detach from the mapped file for the 446 reusable case. Note that the mmalloc_detach or the xmfree() is 447 the last thing we can do with this objfile. */ 448 449#if defined(USE_MMALLOC) && defined(HAVE_MMAP) 450 451 if (objfile->flags & OBJF_MAPPED) 452 { 453 /* Remember the fd so we can close it. We can't close it before 454 doing the detach, and after the detach the objfile is gone. */ 455 int mmfd; 456 457 mmfd = objfile->mmfd; 458 mmalloc_detach (objfile->md); 459 objfile = NULL; 460 close (mmfd); 461 } 462 463#endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */ 464 465 /* If we still have an objfile, then either we don't support reusable 466 objfiles or this one was not reusable. So free it normally. */ 467 468 if (objfile != NULL) 469 { 470 if (objfile->name != NULL) 471 { 472 xmfree (objfile->md, objfile->name); 473 } 474 if (objfile->global_psymbols.list) 475 xmfree (objfile->md, objfile->global_psymbols.list); 476 if (objfile->static_psymbols.list) 477 xmfree (objfile->md, objfile->static_psymbols.list); 478 /* Free the obstacks for non-reusable objfiles */ 479 free_bcache (&objfile->psymbol_cache); 480 obstack_free (&objfile->psymbol_obstack, 0); 481 obstack_free (&objfile->symbol_obstack, 0); 482 obstack_free (&objfile->type_obstack, 0); 483 xmfree (objfile->md, objfile); 484 objfile = NULL; 485 } 486} 487 488static void 489do_free_objfile_cleanup (void *obj) 490{ 491 free_objfile (obj); 492} 493 494struct cleanup * 495make_cleanup_free_objfile (struct objfile *obj) 496{ 497 return make_cleanup (do_free_objfile_cleanup, obj); 498} 499 500/* Free all the object files at once and clean up their users. */ 501 502void 503free_all_objfiles (void) 504{ 505 struct objfile *objfile, *temp; 506 507 ALL_OBJFILES_SAFE (objfile, temp) 508 { 509 free_objfile (objfile); 510 } 511 clear_symtab_users (); 512} 513 514/* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS 515 entries in new_offsets. */ 516void 517objfile_relocate (struct objfile *objfile, struct section_offsets *new_offsets) 518{ 519 struct section_offsets *delta = 520 (struct section_offsets *) alloca (SIZEOF_SECTION_OFFSETS); 521 522 { 523 int i; 524 int something_changed = 0; 525 for (i = 0; i < objfile->num_sections; ++i) 526 { 527 delta->offsets[i] = 528 ANOFFSET (new_offsets, i) - ANOFFSET (objfile->section_offsets, i); 529 if (ANOFFSET (delta, i) != 0) 530 something_changed = 1; 531 } 532 if (!something_changed) 533 return; 534 } 535 536 /* OK, get all the symtabs. */ 537 { 538 struct symtab *s; 539 540 ALL_OBJFILE_SYMTABS (objfile, s) 541 { 542 struct linetable *l; 543 struct blockvector *bv; 544 int i; 545 546 /* First the line table. */ 547 l = LINETABLE (s); 548 if (l) 549 { 550 for (i = 0; i < l->nitems; ++i) 551 l->item[i].pc += ANOFFSET (delta, s->block_line_section); 552 } 553 554 /* Don't relocate a shared blockvector more than once. */ 555 if (!s->primary) 556 continue; 557 558 bv = BLOCKVECTOR (s); 559 for (i = 0; i < BLOCKVECTOR_NBLOCKS (bv); ++i) 560 { 561 struct block *b; 562 struct symbol *sym; 563 int j; 564 565 b = BLOCKVECTOR_BLOCK (bv, i); 566 BLOCK_START (b) += ANOFFSET (delta, s->block_line_section); 567 BLOCK_END (b) += ANOFFSET (delta, s->block_line_section); 568 569 ALL_BLOCK_SYMBOLS (b, j, sym) 570 { 571 fixup_symbol_section (sym, objfile); 572 573 /* The RS6000 code from which this was taken skipped 574 any symbols in STRUCT_NAMESPACE or UNDEF_NAMESPACE. 575 But I'm leaving out that test, on the theory that 576 they can't possibly pass the tests below. */ 577 if ((SYMBOL_CLASS (sym) == LOC_LABEL 578 || SYMBOL_CLASS (sym) == LOC_STATIC 579 || SYMBOL_CLASS (sym) == LOC_INDIRECT) 580 && SYMBOL_SECTION (sym) >= 0) 581 { 582 SYMBOL_VALUE_ADDRESS (sym) += 583 ANOFFSET (delta, SYMBOL_SECTION (sym)); 584 } 585#ifdef MIPS_EFI_SYMBOL_NAME 586 /* Relocate Extra Function Info for ecoff. */ 587 588 else if (SYMBOL_CLASS (sym) == LOC_CONST 589 && SYMBOL_NAMESPACE (sym) == LABEL_NAMESPACE 590 && strcmp (SYMBOL_NAME (sym), MIPS_EFI_SYMBOL_NAME) == 0) 591 ecoff_relocate_efi (sym, ANOFFSET (delta, 592 s->block_line_section)); 593#endif 594 } 595 } 596 } 597 } 598 599 { 600 struct partial_symtab *p; 601 602 ALL_OBJFILE_PSYMTABS (objfile, p) 603 { 604 p->textlow += ANOFFSET (delta, SECT_OFF_TEXT (objfile)); 605 p->texthigh += ANOFFSET (delta, SECT_OFF_TEXT (objfile)); 606 } 607 } 608 609 { 610 struct partial_symbol **psym; 611 612 for (psym = objfile->global_psymbols.list; 613 psym < objfile->global_psymbols.next; 614 psym++) 615 { 616 fixup_psymbol_section (*psym, objfile); 617 if (SYMBOL_SECTION (*psym) >= 0) 618 SYMBOL_VALUE_ADDRESS (*psym) += ANOFFSET (delta, 619 SYMBOL_SECTION (*psym)); 620 } 621 for (psym = objfile->static_psymbols.list; 622 psym < objfile->static_psymbols.next; 623 psym++) 624 { 625 fixup_psymbol_section (*psym, objfile); 626 if (SYMBOL_SECTION (*psym) >= 0) 627 SYMBOL_VALUE_ADDRESS (*psym) += ANOFFSET (delta, 628 SYMBOL_SECTION (*psym)); 629 } 630 } 631 632 { 633 struct minimal_symbol *msym; 634 ALL_OBJFILE_MSYMBOLS (objfile, msym) 635 if (SYMBOL_SECTION (msym) >= 0) 636 SYMBOL_VALUE_ADDRESS (msym) += ANOFFSET (delta, SYMBOL_SECTION (msym)); 637 } 638 /* Relocating different sections by different amounts may cause the symbols 639 to be out of order. */ 640 msymbols_sort (objfile); 641 642 { 643 int i; 644 for (i = 0; i < objfile->num_sections; ++i) 645 (objfile->section_offsets)->offsets[i] = ANOFFSET (new_offsets, i); 646 } 647 648 if (objfile->ei.entry_point != ~(CORE_ADDR) 0) 649 { 650 /* Relocate ei.entry_point with its section offset, use SECT_OFF_TEXT 651 only as a fallback. */ 652 struct obj_section *s; 653 s = find_pc_section (objfile->ei.entry_point); 654 if (s) 655 objfile->ei.entry_point += ANOFFSET (delta, s->the_bfd_section->index); 656 else 657 objfile->ei.entry_point += ANOFFSET (delta, SECT_OFF_TEXT (objfile)); 658 } 659 660 { 661 struct obj_section *s; 662 bfd *abfd; 663 664 abfd = objfile->obfd; 665 666 ALL_OBJFILE_OSECTIONS (objfile, s) 667 { 668 int idx = s->the_bfd_section->index; 669 670 s->addr += ANOFFSET (delta, idx); 671 s->endaddr += ANOFFSET (delta, idx); 672 } 673 } 674 675 if (objfile->ei.entry_func_lowpc != INVALID_ENTRY_LOWPC) 676 { 677 objfile->ei.entry_func_lowpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile)); 678 objfile->ei.entry_func_highpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile)); 679 } 680 681 if (objfile->ei.entry_file_lowpc != INVALID_ENTRY_LOWPC) 682 { 683 objfile->ei.entry_file_lowpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile)); 684 objfile->ei.entry_file_highpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile)); 685 } 686 687 if (objfile->ei.main_func_lowpc != INVALID_ENTRY_LOWPC) 688 { 689 objfile->ei.main_func_lowpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile)); 690 objfile->ei.main_func_highpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile)); 691 } 692 693 /* Relocate breakpoints as necessary, after things are relocated. */ 694 breakpoint_re_set (); 695} 696 697/* Many places in gdb want to test just to see if we have any partial 698 symbols available. This function returns zero if none are currently 699 available, nonzero otherwise. */ 700 701int 702have_partial_symbols (void) 703{ 704 struct objfile *ofp; 705 706 ALL_OBJFILES (ofp) 707 { 708 if (ofp->psymtabs != NULL) 709 { 710 return 1; 711 } 712 } 713 return 0; 714} 715 716/* Many places in gdb want to test just to see if we have any full 717 symbols available. This function returns zero if none are currently 718 available, nonzero otherwise. */ 719 720int 721have_full_symbols (void) 722{ 723 struct objfile *ofp; 724 725 ALL_OBJFILES (ofp) 726 { 727 if (ofp->symtabs != NULL) 728 { 729 return 1; 730 } 731 } 732 return 0; 733} 734 735 736/* This operations deletes all objfile entries that represent solibs that 737 weren't explicitly loaded by the user, via e.g., the add-symbol-file 738 command. 739 */ 740void 741objfile_purge_solibs (void) 742{ 743 struct objfile *objf; 744 struct objfile *temp; 745 746 ALL_OBJFILES_SAFE (objf, temp) 747 { 748 /* We assume that the solib package has been purged already, or will 749 be soon. 750 */ 751 if (!(objf->flags & OBJF_USERLOADED) && (objf->flags & OBJF_SHARED)) 752 free_objfile (objf); 753 } 754} 755 756 757/* Many places in gdb want to test just to see if we have any minimal 758 symbols available. This function returns zero if none are currently 759 available, nonzero otherwise. */ 760 761int 762have_minimal_symbols (void) 763{ 764 struct objfile *ofp; 765 766 ALL_OBJFILES (ofp) 767 { 768 if (ofp->msymbols != NULL) 769 { 770 return 1; 771 } 772 } 773 return 0; 774} 775 776#if defined(USE_MMALLOC) && defined(HAVE_MMAP) 777 778/* Given the name of a mapped symbol file in SYMSFILENAME, and the timestamp 779 of the corresponding symbol file in MTIME, try to open an existing file 780 with the name SYMSFILENAME and verify it is more recent than the base 781 file by checking it's timestamp against MTIME. 782 783 If SYMSFILENAME does not exist (or can't be stat'd), simply returns -1. 784 785 If SYMSFILENAME does exist, but is out of date, we check to see if the 786 user has specified creation of a mapped file. If so, we don't issue 787 any warning message because we will be creating a new mapped file anyway, 788 overwriting the old one. If not, then we issue a warning message so that 789 the user will know why we aren't using this existing mapped symbol file. 790 In either case, we return -1. 791 792 If SYMSFILENAME does exist and is not out of date, but can't be opened for 793 some reason, then prints an appropriate system error message and returns -1. 794 795 Otherwise, returns the open file descriptor. */ 796 797static int 798open_existing_mapped_file (char *symsfilename, long mtime, int flags) 799{ 800 int fd = -1; 801 struct stat sbuf; 802 803 if (stat (symsfilename, &sbuf) == 0) 804 { 805 if (sbuf.st_mtime < mtime) 806 { 807 if (!(flags & OBJF_MAPPED)) 808 { 809 warning ("mapped symbol file `%s' is out of date, ignored it", 810 symsfilename); 811 } 812 } 813 else if ((fd = open (symsfilename, O_RDWR)) < 0) 814 { 815 if (error_pre_print) 816 { 817 printf_unfiltered (error_pre_print); 818 } 819 print_sys_errmsg (symsfilename, errno); 820 } 821 } 822 return (fd); 823} 824 825/* Look for a mapped symbol file that corresponds to FILENAME and is more 826 recent than MTIME. If MAPPED is nonzero, the user has asked that gdb 827 use a mapped symbol file for this file, so create a new one if one does 828 not currently exist. 829 830 If found, then return an open file descriptor for the file, otherwise 831 return -1. 832 833 This routine is responsible for implementing the policy that generates 834 the name of the mapped symbol file from the name of a file containing 835 symbols that gdb would like to read. Currently this policy is to append 836 ".syms" to the name of the file. 837 838 This routine is also responsible for implementing the policy that 839 determines where the mapped symbol file is found (the search path). 840 This policy is that when reading an existing mapped file, a file of 841 the correct name in the current directory takes precedence over a 842 file of the correct name in the same directory as the symbol file. 843 When creating a new mapped file, it is always created in the current 844 directory. This helps to minimize the chances of a user unknowingly 845 creating big mapped files in places like /bin and /usr/local/bin, and 846 allows a local copy to override a manually installed global copy (in 847 /bin for example). */ 848 849static int 850open_mapped_file (char *filename, long mtime, int flags) 851{ 852 int fd; 853 char *symsfilename; 854 855 /* First try to open an existing file in the current directory, and 856 then try the directory where the symbol file is located. */ 857 858 symsfilename = concat ("./", lbasename (filename), ".syms", (char *) NULL); 859 if ((fd = open_existing_mapped_file (symsfilename, mtime, flags)) < 0) 860 { 861 xfree (symsfilename); 862 symsfilename = concat (filename, ".syms", (char *) NULL); 863 fd = open_existing_mapped_file (symsfilename, mtime, flags); 864 } 865 866 /* If we don't have an open file by now, then either the file does not 867 already exist, or the base file has changed since it was created. In 868 either case, if the user has specified use of a mapped file, then 869 create a new mapped file, truncating any existing one. If we can't 870 create one, print a system error message saying why we can't. 871 872 By default the file is rw for everyone, with the user's umask taking 873 care of turning off the permissions the user wants off. */ 874 875 if ((fd < 0) && (flags & OBJF_MAPPED)) 876 { 877 xfree (symsfilename); 878 symsfilename = concat ("./", lbasename (filename), ".syms", 879 (char *) NULL); 880 if ((fd = open (symsfilename, O_RDWR | O_CREAT | O_TRUNC, 0666)) < 0) 881 { 882 if (error_pre_print) 883 { 884 printf_unfiltered (error_pre_print); 885 } 886 print_sys_errmsg (symsfilename, errno); 887 } 888 } 889 890 xfree (symsfilename); 891 return (fd); 892} 893 894static PTR 895map_to_file (int fd) 896{ 897 PTR md; 898 CORE_ADDR mapto; 899 900 md = mmalloc_attach (fd, (PTR) 0); 901 if (md != NULL) 902 { 903 mapto = (CORE_ADDR) mmalloc_getkey (md, 1); 904 md = mmalloc_detach (md); 905 if (md != NULL) 906 { 907 /* FIXME: should figure out why detach failed */ 908 md = NULL; 909 } 910 else if (mapto != (CORE_ADDR) NULL) 911 { 912 /* This mapping file needs to be remapped at "mapto" */ 913 md = mmalloc_attach (fd, (PTR) mapto); 914 } 915 else 916 { 917 /* This is a freshly created mapping file. */ 918 mapto = (CORE_ADDR) mmalloc_findbase (20 * 1024 * 1024); 919 if (mapto != 0) 920 { 921 /* To avoid reusing the freshly created mapping file, at the 922 address selected by mmap, we must truncate it before trying 923 to do an attach at the address we want. */ 924 ftruncate (fd, 0); 925 md = mmalloc_attach (fd, (PTR) mapto); 926 if (md != NULL) 927 { 928 mmalloc_setkey (md, 1, (PTR) mapto); 929 } 930 } 931 } 932 } 933 return (md); 934} 935 936#endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */ 937 938/* Returns a section whose range includes PC and SECTION, 939 or NULL if none found. Note the distinction between the return type, 940 struct obj_section (which is defined in gdb), and the input type 941 struct sec (which is a bfd-defined data type). The obj_section 942 contains a pointer to the bfd struct sec section. */ 943 944struct obj_section * 945find_pc_sect_section (CORE_ADDR pc, struct sec *section) 946{ 947 struct obj_section *s; 948 struct objfile *objfile; 949 950 ALL_OBJSECTIONS (objfile, s) 951 if ((section == 0 || section == s->the_bfd_section) && 952 s->addr <= pc && pc < s->endaddr) 953 return (s); 954 955 return (NULL); 956} 957 958/* Returns a section whose range includes PC or NULL if none found. 959 Backward compatibility, no section. */ 960 961struct obj_section * 962find_pc_section (CORE_ADDR pc) 963{ 964 return find_pc_sect_section (pc, find_pc_mapped_section (pc)); 965} 966 967 968/* In SVR4, we recognize a trampoline by it's section name. 969 That is, if the pc is in a section named ".plt" then we are in 970 a trampoline. */ 971 972int 973in_plt_section (CORE_ADDR pc, char *name) 974{ 975 struct obj_section *s; 976 int retval = 0; 977 978 s = find_pc_section (pc); 979 980 retval = (s != NULL 981 && s->the_bfd_section->name != NULL 982 && STREQ (s->the_bfd_section->name, ".plt")); 983 return (retval); 984} 985 986/* Return nonzero if NAME is in the import list of OBJFILE. Else 987 return zero. */ 988 989int 990is_in_import_list (char *name, struct objfile *objfile) 991{ 992 register int i; 993 994 if (!objfile || !name || !*name) 995 return 0; 996 997 for (i = 0; i < objfile->import_list_size; i++) 998 if (objfile->import_list[i] && STREQ (name, objfile->import_list[i])) 999 return 1; 1000 return 0; 1001} 1002 1003