1/* Read ELF (Executable and Linking Format) object files for GDB. 2 3 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 4 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. 5 6 Written by Fred Fish at Cygnus Support. 7 8 This file is part of GDB. 9 10 This program is free software; you can redistribute it and/or modify 11 it under the terms of the GNU General Public License as published by 12 the Free Software Foundation; either version 2 of the License, or 13 (at your option) any later version. 14 15 This program is distributed in the hope that it will be useful, 16 but WITHOUT ANY WARRANTY; without even the implied warranty of 17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 GNU General Public License for more details. 19 20 You should have received a copy of the GNU General Public License 21 along with this program; if not, write to the Free Software 22 Foundation, Inc., 59 Temple Place - Suite 330, 23 Boston, MA 02111-1307, USA. */ 24 25#include "defs.h" 26#include "bfd.h" 27#include "gdb_string.h" 28#include "elf-bfd.h" 29#include "elf/mips.h" 30#include "symtab.h" 31#include "symfile.h" 32#include "objfiles.h" 33#include "buildsym.h" 34#include "stabsread.h" 35#include "gdb-stabs.h" 36#include "complaints.h" 37#include "demangle.h" 38 39extern void _initialize_elfread (void); 40 41/* The struct elfinfo is available only during ELF symbol table and 42 psymtab reading. It is destroyed at the completion of psymtab-reading. 43 It's local to elf_symfile_read. */ 44 45struct elfinfo 46 { 47 file_ptr dboffset; /* Offset to dwarf debug section */ 48 unsigned int dbsize; /* Size of dwarf debug section */ 49 file_ptr lnoffset; /* Offset to dwarf line number section */ 50 unsigned int lnsize; /* Size of dwarf line number section */ 51 asection *stabsect; /* Section pointer for .stab section */ 52 asection *stabindexsect; /* Section pointer for .stab.index section */ 53 asection *mdebugsect; /* Section pointer for .mdebug section */ 54 }; 55 56static void free_elfinfo (void *); 57 58/* We are called once per section from elf_symfile_read. We 59 need to examine each section we are passed, check to see 60 if it is something we are interested in processing, and 61 if so, stash away some access information for the section. 62 63 For now we recognize the dwarf debug information sections and 64 line number sections from matching their section names. The 65 ELF definition is no real help here since it has no direct 66 knowledge of DWARF (by design, so any debugging format can be 67 used). 68 69 We also recognize the ".stab" sections used by the Sun compilers 70 released with Solaris 2. 71 72 FIXME: The section names should not be hardwired strings (what 73 should they be? I don't think most object file formats have enough 74 section flags to specify what kind of debug section it is 75 -kingdon). */ 76 77static void 78elf_locate_sections (bfd *ignore_abfd, asection *sectp, void *eip) 79{ 80 struct elfinfo *ei; 81 82 ei = (struct elfinfo *) eip; 83 if (strcmp (sectp->name, ".debug") == 0) 84 { 85 ei->dboffset = sectp->filepos; 86 ei->dbsize = bfd_get_section_size (sectp); 87 } 88 else if (strcmp (sectp->name, ".line") == 0) 89 { 90 ei->lnoffset = sectp->filepos; 91 ei->lnsize = bfd_get_section_size (sectp); 92 } 93 else if (strcmp (sectp->name, ".stab") == 0) 94 { 95 ei->stabsect = sectp; 96 } 97 else if (strcmp (sectp->name, ".stab.index") == 0) 98 { 99 ei->stabindexsect = sectp; 100 } 101 else if (strcmp (sectp->name, ".mdebug") == 0) 102 { 103 ei->mdebugsect = sectp; 104 } 105} 106 107static struct minimal_symbol * 108record_minimal_symbol (char *name, CORE_ADDR address, 109 enum minimal_symbol_type ms_type, 110 asection *bfd_section, struct objfile *objfile) 111{ 112 if (ms_type == mst_text || ms_type == mst_file_text) 113 address = SMASH_TEXT_ADDRESS (address); 114 115 return prim_record_minimal_symbol_and_info 116 (name, address, ms_type, NULL, bfd_section->index, bfd_section, objfile); 117} 118 119/* 120 121 LOCAL FUNCTION 122 123 elf_symtab_read -- read the symbol table of an ELF file 124 125 SYNOPSIS 126 127 void elf_symtab_read (struct objfile *objfile, int dynamic) 128 129 DESCRIPTION 130 131 Given an objfile and a flag that specifies whether or not the objfile 132 is for an executable or not (may be shared library for example), add 133 all the global function and data symbols to the minimal symbol table. 134 135 In stabs-in-ELF, as implemented by Sun, there are some local symbols 136 defined in the ELF symbol table, which can be used to locate 137 the beginnings of sections from each ".o" file that was linked to 138 form the executable objfile. We gather any such info and record it 139 in data structures hung off the objfile's private data. 140 141 */ 142 143static void 144elf_symtab_read (struct objfile *objfile, int dynamic) 145{ 146 long storage_needed; 147 asymbol *sym; 148 asymbol **symbol_table; 149 long number_of_symbols; 150 long i; 151 struct cleanup *back_to; 152 CORE_ADDR symaddr; 153 CORE_ADDR offset; 154 enum minimal_symbol_type ms_type; 155 /* If sectinfo is nonNULL, it contains section info that should end up 156 filed in the objfile. */ 157 struct stab_section_info *sectinfo = NULL; 158 /* If filesym is nonzero, it points to a file symbol, but we haven't 159 seen any section info for it yet. */ 160 asymbol *filesym = 0; 161#ifdef SOFUN_ADDRESS_MAYBE_MISSING 162 /* Name of filesym, as saved on the objfile_obstack. */ 163 char *filesymname = obsavestring ("", 0, &objfile->objfile_obstack); 164#endif 165 struct dbx_symfile_info *dbx = objfile->sym_stab_info; 166 int stripped = (bfd_get_symcount (objfile->obfd) == 0); 167 168 if (dynamic) 169 { 170 storage_needed = bfd_get_dynamic_symtab_upper_bound (objfile->obfd); 171 172 /* Nothing to be done if there is no dynamic symtab. */ 173 if (storage_needed < 0) 174 return; 175 } 176 else 177 { 178 storage_needed = bfd_get_symtab_upper_bound (objfile->obfd); 179 if (storage_needed < 0) 180 error ("Can't read symbols from %s: %s", bfd_get_filename (objfile->obfd), 181 bfd_errmsg (bfd_get_error ())); 182 } 183 if (storage_needed > 0) 184 { 185 symbol_table = (asymbol **) xmalloc (storage_needed); 186 back_to = make_cleanup (xfree, symbol_table); 187 if (dynamic) 188 number_of_symbols = bfd_canonicalize_dynamic_symtab (objfile->obfd, 189 symbol_table); 190 else 191 number_of_symbols = bfd_canonicalize_symtab (objfile->obfd, symbol_table); 192 if (number_of_symbols < 0) 193 error ("Can't read symbols from %s: %s", bfd_get_filename (objfile->obfd), 194 bfd_errmsg (bfd_get_error ())); 195 196 for (i = 0; i < number_of_symbols; i++) 197 { 198 sym = symbol_table[i]; 199 if (sym->name == NULL || *sym->name == '\0') 200 { 201 /* Skip names that don't exist (shouldn't happen), or names 202 that are null strings (may happen). */ 203 continue; 204 } 205 206 offset = ANOFFSET (objfile->section_offsets, sym->section->index); 207 if (dynamic 208 && sym->section == &bfd_und_section 209 && (sym->flags & BSF_FUNCTION)) 210 { 211 struct minimal_symbol *msym; 212 213 /* Symbol is a reference to a function defined in 214 a shared library. 215 If its value is non zero then it is usually the address 216 of the corresponding entry in the procedure linkage table, 217 plus the desired section offset. 218 If its value is zero then the dynamic linker has to resolve 219 the symbol. We are unable to find any meaningful address 220 for this symbol in the executable file, so we skip it. */ 221 symaddr = sym->value; 222 if (symaddr == 0) 223 continue; 224 symaddr += offset; 225 msym = record_minimal_symbol 226 ((char *) sym->name, symaddr, 227 mst_solib_trampoline, sym->section, objfile); 228#ifdef SOFUN_ADDRESS_MAYBE_MISSING 229 if (msym != NULL) 230 msym->filename = filesymname; 231#endif 232 continue; 233 } 234 235 /* If it is a nonstripped executable, do not enter dynamic 236 symbols, as the dynamic symbol table is usually a subset 237 of the main symbol table. */ 238 if (dynamic && !stripped) 239 continue; 240 if (sym->flags & BSF_FILE) 241 { 242 /* STT_FILE debugging symbol that helps stabs-in-elf debugging. 243 Chain any old one onto the objfile; remember new sym. */ 244 if (sectinfo != NULL) 245 { 246 sectinfo->next = dbx->stab_section_info; 247 dbx->stab_section_info = sectinfo; 248 sectinfo = NULL; 249 } 250 filesym = sym; 251#ifdef SOFUN_ADDRESS_MAYBE_MISSING 252 filesymname = 253 obsavestring ((char *) filesym->name, strlen (filesym->name), 254 &objfile->objfile_obstack); 255#endif 256 } 257 else if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK)) 258 { 259 struct minimal_symbol *msym; 260 261 /* Select global/local/weak symbols. Note that bfd puts abs 262 symbols in their own section, so all symbols we are 263 interested in will have a section. */ 264 /* Bfd symbols are section relative. */ 265 symaddr = sym->value + sym->section->vma; 266 /* Relocate all non-absolute symbols by the section offset. */ 267 if (sym->section != &bfd_abs_section) 268 { 269 symaddr += offset; 270 } 271 /* For non-absolute symbols, use the type of the section 272 they are relative to, to intuit text/data. Bfd provides 273 no way of figuring this out for absolute symbols. */ 274 if (sym->section == &bfd_abs_section) 275 { 276 /* This is a hack to get the minimal symbol type 277 right for Irix 5, which has absolute addresses 278 with special section indices for dynamic symbols. */ 279 unsigned short shndx = 280 ((elf_symbol_type *) sym)->internal_elf_sym.st_shndx; 281 282 switch (shndx) 283 { 284 case SHN_MIPS_TEXT: 285 ms_type = mst_text; 286 break; 287 case SHN_MIPS_DATA: 288 ms_type = mst_data; 289 break; 290 case SHN_MIPS_ACOMMON: 291 ms_type = mst_bss; 292 break; 293 default: 294 ms_type = mst_abs; 295 } 296 297 /* If it is an Irix dynamic symbol, skip section name 298 symbols, relocate all others by section offset. */ 299 if (ms_type != mst_abs) 300 { 301 if (sym->name[0] == '.') 302 continue; 303 symaddr += offset; 304 } 305 } 306 else if (sym->section->flags & SEC_CODE) 307 { 308 if (sym->flags & BSF_GLOBAL) 309 { 310 ms_type = mst_text; 311 } 312 else if ((sym->name[0] == '.' && sym->name[1] == 'L') 313 || ((sym->flags & BSF_LOCAL) 314 && sym->name[0] == '$' 315 && sym->name[1] == 'L')) 316 /* Looks like a compiler-generated label. Skip 317 it. The assembler should be skipping these (to 318 keep executables small), but apparently with 319 gcc on the (deleted) delta m88k SVR4, it loses. 320 So to have us check too should be harmless (but 321 I encourage people to fix this in the assembler 322 instead of adding checks here). */ 323 continue; 324 else 325 { 326 ms_type = mst_file_text; 327 } 328 } 329 else if (sym->section->flags & SEC_ALLOC) 330 { 331 if (sym->flags & (BSF_GLOBAL | BSF_WEAK)) 332 { 333 if (sym->section->flags & SEC_LOAD) 334 { 335 ms_type = mst_data; 336 } 337 else 338 { 339 ms_type = mst_bss; 340 } 341 } 342 else if (sym->flags & BSF_LOCAL) 343 { 344 /* Named Local variable in a Data section. 345 Check its name for stabs-in-elf. */ 346 int special_local_sect; 347 if (strcmp ("Bbss.bss", sym->name) == 0) 348 special_local_sect = SECT_OFF_BSS (objfile); 349 else if (strcmp ("Ddata.data", sym->name) == 0) 350 special_local_sect = SECT_OFF_DATA (objfile); 351 else if (strcmp ("Drodata.rodata", sym->name) == 0) 352 special_local_sect = SECT_OFF_RODATA (objfile); 353 else 354 special_local_sect = -1; 355 if (special_local_sect >= 0) 356 { 357 /* Found a special local symbol. Allocate a 358 sectinfo, if needed, and fill it in. */ 359 if (sectinfo == NULL) 360 { 361 int max_index; 362 size_t size; 363 364 max_index 365 = max (SECT_OFF_BSS (objfile), 366 max (SECT_OFF_DATA (objfile), 367 SECT_OFF_RODATA (objfile))); 368 369 /* max_index is the largest index we'll 370 use into this array, so we must 371 allocate max_index+1 elements for it. 372 However, 'struct stab_section_info' 373 already includes one element, so we 374 need to allocate max_index aadditional 375 elements. */ 376 size = (sizeof (struct stab_section_info) 377 + (sizeof (CORE_ADDR) 378 * max_index)); 379 sectinfo = (struct stab_section_info *) 380 xmalloc (size); 381 memset (sectinfo, 0, size); 382 sectinfo->num_sections = max_index; 383 if (filesym == NULL) 384 { 385 complaint (&symfile_complaints, 386 "elf/stab section information %s without a preceding file symbol", 387 sym->name); 388 } 389 else 390 { 391 sectinfo->filename = 392 (char *) filesym->name; 393 } 394 } 395 if (sectinfo->sections[special_local_sect] != 0) 396 complaint (&symfile_complaints, 397 "duplicated elf/stab section information for %s", 398 sectinfo->filename); 399 /* BFD symbols are section relative. */ 400 symaddr = sym->value + sym->section->vma; 401 /* Relocate non-absolute symbols by the 402 section offset. */ 403 if (sym->section != &bfd_abs_section) 404 symaddr += offset; 405 sectinfo->sections[special_local_sect] = symaddr; 406 /* The special local symbols don't go in the 407 minimal symbol table, so ignore this one. */ 408 continue; 409 } 410 /* Not a special stabs-in-elf symbol, do regular 411 symbol processing. */ 412 if (sym->section->flags & SEC_LOAD) 413 { 414 ms_type = mst_file_data; 415 } 416 else 417 { 418 ms_type = mst_file_bss; 419 } 420 } 421 else 422 { 423 ms_type = mst_unknown; 424 } 425 } 426 else 427 { 428 /* FIXME: Solaris2 shared libraries include lots of 429 odd "absolute" and "undefined" symbols, that play 430 hob with actions like finding what function the PC 431 is in. Ignore them if they aren't text, data, or bss. */ 432 /* ms_type = mst_unknown; */ 433 continue; /* Skip this symbol. */ 434 } 435 msym = record_minimal_symbol 436 ((char *) sym->name, symaddr, 437 ms_type, sym->section, objfile); 438 if (msym) 439 { 440 /* Pass symbol size field in via BFD. FIXME!!! */ 441 unsigned long size = ((elf_symbol_type *) sym)->internal_elf_sym.st_size; 442 MSYMBOL_SIZE(msym) = size; 443 } 444#ifdef SOFUN_ADDRESS_MAYBE_MISSING 445 if (msym != NULL) 446 msym->filename = filesymname; 447#endif 448 ELF_MAKE_MSYMBOL_SPECIAL (sym, msym); 449 } 450 } 451 do_cleanups (back_to); 452 } 453} 454 455/* Scan and build partial symbols for a symbol file. 456 We have been initialized by a call to elf_symfile_init, which 457 currently does nothing. 458 459 SECTION_OFFSETS is a set of offsets to apply to relocate the symbols 460 in each section. We simplify it down to a single offset for all 461 symbols. FIXME. 462 463 MAINLINE is true if we are reading the main symbol 464 table (as opposed to a shared lib or dynamically loaded file). 465 466 This function only does the minimum work necessary for letting the 467 user "name" things symbolically; it does not read the entire symtab. 468 Instead, it reads the external and static symbols and puts them in partial 469 symbol tables. When more extensive information is requested of a 470 file, the corresponding partial symbol table is mutated into a full 471 fledged symbol table by going back and reading the symbols 472 for real. 473 474 We look for sections with specific names, to tell us what debug 475 format to look for: FIXME!!! 476 477 dwarf_build_psymtabs() builds psymtabs for DWARF symbols; 478 elfstab_build_psymtabs() handles STABS symbols; 479 mdebug_build_psymtabs() handles ECOFF debugging information. 480 481 Note that ELF files have a "minimal" symbol table, which looks a lot 482 like a COFF symbol table, but has only the minimal information necessary 483 for linking. We process this also, and use the information to 484 build gdb's minimal symbol table. This gives us some minimal debugging 485 capability even for files compiled without -g. */ 486 487static void 488elf_symfile_read (struct objfile *objfile, int mainline) 489{ 490 bfd *abfd = objfile->obfd; 491 struct elfinfo ei; 492 struct cleanup *back_to; 493 CORE_ADDR offset; 494 495 init_minimal_symbol_collection (); 496 back_to = make_cleanup_discard_minimal_symbols (); 497 498 memset ((char *) &ei, 0, sizeof (ei)); 499 500 /* Allocate struct to keep track of the symfile */ 501 objfile->sym_stab_info = (struct dbx_symfile_info *) 502 xmalloc (sizeof (struct dbx_symfile_info)); 503 memset ((char *) objfile->sym_stab_info, 0, sizeof (struct dbx_symfile_info)); 504 make_cleanup (free_elfinfo, (void *) objfile); 505 506 /* Process the normal ELF symbol table first. This may write some 507 chain of info into the dbx_symfile_info in objfile->sym_stab_info, 508 which can later be used by elfstab_offset_sections. */ 509 510 elf_symtab_read (objfile, 0); 511 512 /* Add the dynamic symbols. */ 513 514 elf_symtab_read (objfile, 1); 515 516 /* Install any minimal symbols that have been collected as the current 517 minimal symbols for this objfile. The debug readers below this point 518 should not generate new minimal symbols; if they do it's their 519 responsibility to install them. "mdebug" appears to be the only one 520 which will do this. */ 521 522 install_minimal_symbols (objfile); 523 do_cleanups (back_to); 524 525 /* Now process debugging information, which is contained in 526 special ELF sections. */ 527 528 /* If we are reinitializing, or if we have never loaded syms yet, 529 set table to empty. MAINLINE is cleared so that *_read_psymtab 530 functions do not all also re-initialize the psymbol table. */ 531 if (mainline) 532 { 533 init_psymbol_list (objfile, 0); 534 mainline = 0; 535 } 536 537 /* We first have to find them... */ 538 bfd_map_over_sections (abfd, elf_locate_sections, (void *) & ei); 539 540 /* ELF debugging information is inserted into the psymtab in the 541 order of least informative first - most informative last. Since 542 the psymtab table is searched `most recent insertion first' this 543 increases the probability that more detailed debug information 544 for a section is found. 545 546 For instance, an object file might contain both .mdebug (XCOFF) 547 and .debug_info (DWARF2) sections then .mdebug is inserted first 548 (searched last) and DWARF2 is inserted last (searched first). If 549 we don't do this then the XCOFF info is found first - for code in 550 an included file XCOFF info is useless. */ 551 552 if (ei.mdebugsect) 553 { 554 const struct ecoff_debug_swap *swap; 555 556 /* .mdebug section, presumably holding ECOFF debugging 557 information. */ 558 swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap; 559 if (swap) 560 elfmdebug_build_psymtabs (objfile, swap, ei.mdebugsect); 561 } 562 if (ei.stabsect) 563 { 564 asection *str_sect; 565 566 /* Stab sections have an associated string table that looks like 567 a separate section. */ 568 str_sect = bfd_get_section_by_name (abfd, ".stabstr"); 569 570 /* FIXME should probably warn about a stab section without a stabstr. */ 571 if (str_sect) 572 elfstab_build_psymtabs (objfile, 573 mainline, 574 ei.stabsect, 575 str_sect->filepos, 576 bfd_section_size (abfd, str_sect)); 577 } 578 if (dwarf2_has_info (objfile)) 579 { 580 /* DWARF 2 sections */ 581 dwarf2_build_psymtabs (objfile, mainline); 582 } 583 else if (ei.dboffset && ei.lnoffset) 584 { 585 /* DWARF sections */ 586 dwarf_build_psymtabs (objfile, 587 mainline, 588 ei.dboffset, ei.dbsize, 589 ei.lnoffset, ei.lnsize); 590 } 591 592 /* FIXME: kettenis/20030504: This still needs to be integrated with 593 dwarf2read.c in a better way. */ 594 dwarf2_build_frame_info (objfile); 595} 596 597/* This cleans up the objfile's sym_stab_info pointer, and the chain of 598 stab_section_info's, that might be dangling from it. */ 599 600static void 601free_elfinfo (void *objp) 602{ 603 struct objfile *objfile = (struct objfile *) objp; 604 struct dbx_symfile_info *dbxinfo = objfile->sym_stab_info; 605 struct stab_section_info *ssi, *nssi; 606 607 ssi = dbxinfo->stab_section_info; 608 while (ssi) 609 { 610 nssi = ssi->next; 611 xfree (ssi); 612 ssi = nssi; 613 } 614 615 dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */ 616} 617 618 619/* Initialize anything that needs initializing when a completely new symbol 620 file is specified (not just adding some symbols from another file, e.g. a 621 shared library). 622 623 We reinitialize buildsym, since we may be reading stabs from an ELF file. */ 624 625static void 626elf_new_init (struct objfile *ignore) 627{ 628 stabsread_new_init (); 629 buildsym_new_init (); 630} 631 632/* Perform any local cleanups required when we are done with a particular 633 objfile. I.E, we are in the process of discarding all symbol information 634 for an objfile, freeing up all memory held for it, and unlinking the 635 objfile struct from the global list of known objfiles. */ 636 637static void 638elf_symfile_finish (struct objfile *objfile) 639{ 640 if (objfile->sym_stab_info != NULL) 641 { 642 xfree (objfile->sym_stab_info); 643 } 644} 645 646/* ELF specific initialization routine for reading symbols. 647 648 It is passed a pointer to a struct sym_fns which contains, among other 649 things, the BFD for the file whose symbols are being read, and a slot for 650 a pointer to "private data" which we can fill with goodies. 651 652 For now at least, we have nothing in particular to do, so this function is 653 just a stub. */ 654 655static void 656elf_symfile_init (struct objfile *objfile) 657{ 658 /* ELF objects may be reordered, so set OBJF_REORDERED. If we 659 find this causes a significant slowdown in gdb then we could 660 set it in the debug symbol readers only when necessary. */ 661 objfile->flags |= OBJF_REORDERED; 662} 663 664/* When handling an ELF file that contains Sun STABS debug info, 665 some of the debug info is relative to the particular chunk of the 666 section that was generated in its individual .o file. E.g. 667 offsets to static variables are relative to the start of the data 668 segment *for that module before linking*. This information is 669 painfully squirreled away in the ELF symbol table as local symbols 670 with wierd names. Go get 'em when needed. */ 671 672void 673elfstab_offset_sections (struct objfile *objfile, struct partial_symtab *pst) 674{ 675 char *filename = pst->filename; 676 struct dbx_symfile_info *dbx = objfile->sym_stab_info; 677 struct stab_section_info *maybe = dbx->stab_section_info; 678 struct stab_section_info *questionable = 0; 679 int i; 680 char *p; 681 682 /* The ELF symbol info doesn't include path names, so strip the path 683 (if any) from the psymtab filename. */ 684 while (0 != (p = strchr (filename, '/'))) 685 filename = p + 1; 686 687 /* FIXME: This linear search could speed up significantly 688 if it was chained in the right order to match how we search it, 689 and if we unchained when we found a match. */ 690 for (; maybe; maybe = maybe->next) 691 { 692 if (filename[0] == maybe->filename[0] 693 && strcmp (filename, maybe->filename) == 0) 694 { 695 /* We found a match. But there might be several source files 696 (from different directories) with the same name. */ 697 if (0 == maybe->found) 698 break; 699 questionable = maybe; /* Might use it later. */ 700 } 701 } 702 703 if (maybe == 0 && questionable != 0) 704 { 705 complaint (&symfile_complaints, 706 "elf/stab section information questionable for %s", filename); 707 maybe = questionable; 708 } 709 710 if (maybe) 711 { 712 /* Found it! Allocate a new psymtab struct, and fill it in. */ 713 maybe->found++; 714 pst->section_offsets = (struct section_offsets *) 715 obstack_alloc (&objfile->objfile_obstack, 716 SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)); 717 for (i = 0; i < maybe->num_sections; i++) 718 (pst->section_offsets)->offsets[i] = maybe->sections[i]; 719 return; 720 } 721 722 /* We were unable to find any offsets for this file. Complain. */ 723 if (dbx->stab_section_info) /* If there *is* any info, */ 724 complaint (&symfile_complaints, 725 "elf/stab section information missing for %s", filename); 726} 727 728/* Register that we are able to handle ELF object file formats. */ 729 730static struct sym_fns elf_sym_fns = 731{ 732 bfd_target_elf_flavour, 733 elf_new_init, /* sym_new_init: init anything gbl to entire symtab */ 734 elf_symfile_init, /* sym_init: read initial info, setup for sym_read() */ 735 elf_symfile_read, /* sym_read: read a symbol file into symtab */ 736 elf_symfile_finish, /* sym_finish: finished with file, cleanup */ 737 default_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */ 738 NULL /* next: pointer to next struct sym_fns */ 739}; 740 741void 742_initialize_elfread (void) 743{ 744 add_symtab_fns (&elf_sym_fns); 745} 746