1 /* Read ELF (Executable and Linking Format) object files for GDB.
3 Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
5 Free Software Foundation, Inc.
7 Written by Fred Fish at Cygnus Support.
9 This file is part of GDB.
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 3 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program. If not, see <http://www.gnu.org/licenses/>. */
26 #include "gdb_string.h"
28 #include "elf/common.h"
29 #include "elf/internal.h"
35 #include "stabsread.h"
36 #include "gdb-stabs.h"
37 #include "complaints.h"
40 extern void _initialize_elfread (void);
42 /* The struct elfinfo is available only during ELF symbol table and
43 psymtab reading. It is destroyed at the completion of psymtab-reading.
44 It's local to elf_symfile_read. */
48 asection *stabsect; /* Section pointer for .stab section */
49 asection *stabindexsect; /* Section pointer for .stab.index section */
50 asection *mdebugsect; /* Section pointer for .mdebug section */
53 static void free_elfinfo (void *);
55 /* Locate the segments in ABFD. */
57 static struct symfile_segment_data *
58 elf_symfile_segments (bfd *abfd)
60 Elf_Internal_Phdr *phdrs, **segments;
62 int num_phdrs, num_segments, num_sections, i;
64 struct symfile_segment_data *data;
66 phdrs_size = bfd_get_elf_phdr_upper_bound (abfd);
70 phdrs = alloca (phdrs_size);
71 num_phdrs = bfd_get_elf_phdrs (abfd, phdrs);
76 segments = alloca (sizeof (Elf_Internal_Phdr *) * num_phdrs);
77 for (i = 0; i < num_phdrs; i++)
78 if (phdrs[i].p_type == PT_LOAD)
79 segments[num_segments++] = &phdrs[i];
81 if (num_segments == 0)
84 data = XZALLOC (struct symfile_segment_data);
85 data->num_segments = num_segments;
86 data->segment_bases = XCALLOC (num_segments, CORE_ADDR);
87 data->segment_sizes = XCALLOC (num_segments, CORE_ADDR);
89 for (i = 0; i < num_segments; i++)
91 data->segment_bases[i] = segments[i]->p_vaddr;
92 data->segment_sizes[i] = segments[i]->p_memsz;
95 num_sections = bfd_count_sections (abfd);
96 data->segment_info = XCALLOC (num_sections, int);
98 for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next)
103 if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
106 vma = bfd_get_section_vma (abfd, sect);
108 for (j = 0; j < num_segments; j++)
109 if (segments[j]->p_memsz > 0
110 && vma >= segments[j]->p_vaddr
111 && (vma - segments[j]->p_vaddr) < segments[j]->p_memsz)
113 data->segment_info[i] = j + 1;
117 if (bfd_get_section_size (sect) > 0 && j == num_segments)
118 warning (_("Loadable segment \"%s\" outside of ELF segments"),
119 bfd_section_name (abfd, sect));
125 /* We are called once per section from elf_symfile_read. We
126 need to examine each section we are passed, check to see
127 if it is something we are interested in processing, and
128 if so, stash away some access information for the section.
130 For now we recognize the dwarf debug information sections and
131 line number sections from matching their section names. The
132 ELF definition is no real help here since it has no direct
133 knowledge of DWARF (by design, so any debugging format can be
136 We also recognize the ".stab" sections used by the Sun compilers
137 released with Solaris 2.
139 FIXME: The section names should not be hardwired strings (what
140 should they be? I don't think most object file formats have enough
141 section flags to specify what kind of debug section it is
145 elf_locate_sections (bfd *ignore_abfd, asection *sectp, void *eip)
149 ei = (struct elfinfo *) eip;
150 if (strcmp (sectp->name, ".stab") == 0)
152 ei->stabsect = sectp;
154 else if (strcmp (sectp->name, ".stab.index") == 0)
156 ei->stabindexsect = sectp;
158 else if (strcmp (sectp->name, ".mdebug") == 0)
160 ei->mdebugsect = sectp;
164 static struct minimal_symbol *
165 record_minimal_symbol (char *name, CORE_ADDR address,
166 enum minimal_symbol_type ms_type,
167 asection *bfd_section, struct objfile *objfile)
169 struct gdbarch *gdbarch = get_objfile_arch (objfile);
171 if (ms_type == mst_text || ms_type == mst_file_text)
172 address = gdbarch_smash_text_address (gdbarch, address);
174 return prim_record_minimal_symbol_and_info
175 (name, address, ms_type, bfd_section->index, bfd_section, objfile);
182 elf_symtab_read -- read the symbol table of an ELF file
186 void elf_symtab_read (struct objfile *objfile, int type,
187 long number_of_symbols, asymbol **symbol_table)
191 Given an objfile, a symbol table, and a flag indicating whether the
192 symbol table contains regular, dynamic, or synthetic symbols, add all
193 the global function and data symbols to the minimal symbol table.
195 In stabs-in-ELF, as implemented by Sun, there are some local symbols
196 defined in the ELF symbol table, which can be used to locate
197 the beginnings of sections from each ".o" file that was linked to
198 form the executable objfile. We gather any such info and record it
199 in data structures hung off the objfile's private data.
205 #define ST_SYNTHETIC 2
208 elf_symtab_read (struct objfile *objfile, int type,
209 long number_of_symbols, asymbol **symbol_table)
211 struct gdbarch *gdbarch = get_objfile_arch (objfile);
217 enum minimal_symbol_type ms_type;
218 /* If sectinfo is nonNULL, it contains section info that should end up
219 filed in the objfile. */
220 struct stab_section_info *sectinfo = NULL;
221 /* If filesym is nonzero, it points to a file symbol, but we haven't
222 seen any section info for it yet. */
223 asymbol *filesym = 0;
224 /* Name of filesym, as saved on the objfile_obstack. */
225 char *filesymname = obsavestring ("", 0, &objfile->objfile_obstack);
226 struct dbx_symfile_info *dbx = objfile->deprecated_sym_stab_info;
227 int stripped = (bfd_get_symcount (objfile->obfd) == 0);
229 for (i = 0; i < number_of_symbols; i++)
231 sym = symbol_table[i];
232 if (sym->name == NULL || *sym->name == '\0')
234 /* Skip names that don't exist (shouldn't happen), or names
235 that are null strings (may happen). */
239 /* Skip "special" symbols, e.g. ARM mapping symbols. These are
240 symbols which do not correspond to objects in the symbol table,
241 but have some other target-specific meaning. */
242 if (bfd_is_target_special_symbol (objfile->obfd, sym))
244 if (gdbarch_record_special_symbol_p (gdbarch))
245 gdbarch_record_special_symbol (gdbarch, objfile, sym);
249 offset = ANOFFSET (objfile->section_offsets, sym->section->index);
250 if (type == ST_DYNAMIC
251 && sym->section == &bfd_und_section
252 && (sym->flags & BSF_FUNCTION))
254 struct minimal_symbol *msym;
255 bfd *abfd = objfile->obfd;
258 /* Symbol is a reference to a function defined in
260 If its value is non zero then it is usually the address
261 of the corresponding entry in the procedure linkage table,
262 plus the desired section offset.
263 If its value is zero then the dynamic linker has to resolve
264 the symbol. We are unable to find any meaningful address
265 for this symbol in the executable file, so we skip it. */
266 symaddr = sym->value;
270 /* sym->section is the undefined section. However, we want to
271 record the section where the PLT stub resides with the
272 minimal symbol. Search the section table for the one that
273 covers the stub's address. */
274 for (sect = abfd->sections; sect != NULL; sect = sect->next)
276 if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
279 if (symaddr >= bfd_get_section_vma (abfd, sect)
280 && symaddr < bfd_get_section_vma (abfd, sect)
281 + bfd_get_section_size (sect))
287 symaddr += ANOFFSET (objfile->section_offsets, sect->index);
289 msym = record_minimal_symbol
290 ((char *) sym->name, symaddr, mst_solib_trampoline, sect, objfile);
292 msym->filename = filesymname;
296 /* If it is a nonstripped executable, do not enter dynamic
297 symbols, as the dynamic symbol table is usually a subset
298 of the main symbol table. */
299 if (type == ST_DYNAMIC && !stripped)
301 if (sym->flags & BSF_FILE)
303 /* STT_FILE debugging symbol that helps stabs-in-elf debugging.
304 Chain any old one onto the objfile; remember new sym. */
305 if (sectinfo != NULL)
307 sectinfo->next = dbx->stab_section_info;
308 dbx->stab_section_info = sectinfo;
313 obsavestring ((char *) filesym->name, strlen (filesym->name),
314 &objfile->objfile_obstack);
316 else if (sym->flags & BSF_SECTION_SYM)
318 else if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK))
320 struct minimal_symbol *msym;
322 /* Select global/local/weak symbols. Note that bfd puts abs
323 symbols in their own section, so all symbols we are
324 interested in will have a section. */
325 /* Bfd symbols are section relative. */
326 symaddr = sym->value + sym->section->vma;
327 /* Relocate all non-absolute and non-TLS symbols by the
329 if (sym->section != &bfd_abs_section
330 && !(sym->section->flags & SEC_THREAD_LOCAL))
334 /* For non-absolute symbols, use the type of the section
335 they are relative to, to intuit text/data. Bfd provides
336 no way of figuring this out for absolute symbols. */
337 if (sym->section == &bfd_abs_section)
339 /* This is a hack to get the minimal symbol type
340 right for Irix 5, which has absolute addresses
341 with special section indices for dynamic symbols.
343 NOTE: uweigand-20071112: Synthetic symbols do not
344 have an ELF-private part, so do not touch those. */
345 unsigned int shndx = type == ST_SYNTHETIC ? 0 :
346 ((elf_symbol_type *) sym)->internal_elf_sym.st_shndx;
356 case SHN_MIPS_ACOMMON:
363 /* If it is an Irix dynamic symbol, skip section name
364 symbols, relocate all others by section offset. */
365 if (ms_type != mst_abs)
367 if (sym->name[0] == '.')
372 else if (sym->section->flags & SEC_CODE)
374 if (sym->flags & (BSF_GLOBAL | BSF_WEAK))
378 else if ((sym->name[0] == '.' && sym->name[1] == 'L')
379 || ((sym->flags & BSF_LOCAL)
380 && sym->name[0] == '$'
381 && sym->name[1] == 'L'))
382 /* Looks like a compiler-generated label. Skip
383 it. The assembler should be skipping these (to
384 keep executables small), but apparently with
385 gcc on the (deleted) delta m88k SVR4, it loses.
386 So to have us check too should be harmless (but
387 I encourage people to fix this in the assembler
388 instead of adding checks here). */
392 ms_type = mst_file_text;
395 else if (sym->section->flags & SEC_ALLOC)
397 if (sym->flags & (BSF_GLOBAL | BSF_WEAK))
399 if (sym->section->flags & SEC_LOAD)
408 else if (sym->flags & BSF_LOCAL)
410 /* Named Local variable in a Data section.
411 Check its name for stabs-in-elf. */
412 int special_local_sect;
413 if (strcmp ("Bbss.bss", sym->name) == 0)
414 special_local_sect = SECT_OFF_BSS (objfile);
415 else if (strcmp ("Ddata.data", sym->name) == 0)
416 special_local_sect = SECT_OFF_DATA (objfile);
417 else if (strcmp ("Drodata.rodata", sym->name) == 0)
418 special_local_sect = SECT_OFF_RODATA (objfile);
420 special_local_sect = -1;
421 if (special_local_sect >= 0)
423 /* Found a special local symbol. Allocate a
424 sectinfo, if needed, and fill it in. */
425 if (sectinfo == NULL)
431 = max (SECT_OFF_BSS (objfile),
432 max (SECT_OFF_DATA (objfile),
433 SECT_OFF_RODATA (objfile)));
435 /* max_index is the largest index we'll
436 use into this array, so we must
437 allocate max_index+1 elements for it.
438 However, 'struct stab_section_info'
439 already includes one element, so we
440 need to allocate max_index aadditional
442 size = (sizeof (struct stab_section_info)
443 + (sizeof (CORE_ADDR)
445 sectinfo = (struct stab_section_info *)
447 memset (sectinfo, 0, size);
448 sectinfo->num_sections = max_index;
451 complaint (&symfile_complaints,
452 _("elf/stab section information %s without a preceding file symbol"),
458 (char *) filesym->name;
461 if (sectinfo->sections[special_local_sect] != 0)
462 complaint (&symfile_complaints,
463 _("duplicated elf/stab section information for %s"),
465 /* BFD symbols are section relative. */
466 symaddr = sym->value + sym->section->vma;
467 /* Relocate non-absolute symbols by the
469 if (sym->section != &bfd_abs_section)
471 sectinfo->sections[special_local_sect] = symaddr;
472 /* The special local symbols don't go in the
473 minimal symbol table, so ignore this one. */
476 /* Not a special stabs-in-elf symbol, do regular
477 symbol processing. */
478 if (sym->section->flags & SEC_LOAD)
480 ms_type = mst_file_data;
484 ms_type = mst_file_bss;
489 ms_type = mst_unknown;
494 /* FIXME: Solaris2 shared libraries include lots of
495 odd "absolute" and "undefined" symbols, that play
496 hob with actions like finding what function the PC
497 is in. Ignore them if they aren't text, data, or bss. */
498 /* ms_type = mst_unknown; */
499 continue; /* Skip this symbol. */
501 msym = record_minimal_symbol
502 ((char *) sym->name, symaddr,
503 ms_type, sym->section, objfile);
507 /* Pass symbol size field in via BFD. FIXME!!! */
508 elf_symbol_type *elf_sym;
510 /* NOTE: uweigand-20071112: A synthetic symbol does not have an
511 ELF-private part. However, in some cases (e.g. synthetic
512 'dot' symbols on ppc64) the udata.p entry is set to point back
513 to the original ELF symbol it was derived from. Get the size
515 if (type != ST_SYNTHETIC)
516 elf_sym = (elf_symbol_type *) sym;
518 elf_sym = (elf_symbol_type *) sym->udata.p;
521 MSYMBOL_SIZE(msym) = elf_sym->internal_elf_sym.st_size;
524 msym->filename = filesymname;
525 gdbarch_elf_make_msymbol_special (gdbarch, sym, msym);
527 /* For @plt symbols, also record a trampoline to the
528 destination symbol. The @plt symbol will be used in
529 disassembly, and the trampoline will be used when we are
530 trying to find the target. */
531 if (msym && ms_type == mst_text && type == ST_SYNTHETIC)
533 int len = strlen (sym->name);
535 if (len > 4 && strcmp (sym->name + len - 4, "@plt") == 0)
537 char *base_name = alloca (len - 4 + 1);
538 struct minimal_symbol *mtramp;
540 memcpy (base_name, sym->name, len - 4);
541 base_name[len - 4] = '\0';
542 mtramp = record_minimal_symbol (base_name, symaddr,
543 mst_solib_trampoline,
544 sym->section, objfile);
547 MSYMBOL_SIZE (mtramp) = MSYMBOL_SIZE (msym);
548 mtramp->filename = filesymname;
549 gdbarch_elf_make_msymbol_special (gdbarch, sym, mtramp);
557 /* Scan and build partial symbols for a symbol file.
558 We have been initialized by a call to elf_symfile_init, which
559 currently does nothing.
561 SECTION_OFFSETS is a set of offsets to apply to relocate the symbols
562 in each section. We simplify it down to a single offset for all
565 MAINLINE is true if we are reading the main symbol
566 table (as opposed to a shared lib or dynamically loaded file).
568 This function only does the minimum work necessary for letting the
569 user "name" things symbolically; it does not read the entire symtab.
570 Instead, it reads the external and static symbols and puts them in partial
571 symbol tables. When more extensive information is requested of a
572 file, the corresponding partial symbol table is mutated into a full
573 fledged symbol table by going back and reading the symbols
576 We look for sections with specific names, to tell us what debug
577 format to look for: FIXME!!!
579 elfstab_build_psymtabs() handles STABS symbols;
580 mdebug_build_psymtabs() handles ECOFF debugging information.
582 Note that ELF files have a "minimal" symbol table, which looks a lot
583 like a COFF symbol table, but has only the minimal information necessary
584 for linking. We process this also, and use the information to
585 build gdb's minimal symbol table. This gives us some minimal debugging
586 capability even for files compiled without -g. */
589 elf_symfile_read (struct objfile *objfile, int mainline)
591 bfd *abfd = objfile->obfd;
593 struct cleanup *back_to;
595 long symcount = 0, dynsymcount = 0, synthcount, storage_needed;
596 asymbol **symbol_table = NULL, **dyn_symbol_table = NULL;
599 init_minimal_symbol_collection ();
600 back_to = make_cleanup_discard_minimal_symbols ();
602 memset ((char *) &ei, 0, sizeof (ei));
604 /* Allocate struct to keep track of the symfile */
605 objfile->deprecated_sym_stab_info = (struct dbx_symfile_info *)
606 xmalloc (sizeof (struct dbx_symfile_info));
607 memset ((char *) objfile->deprecated_sym_stab_info, 0, sizeof (struct dbx_symfile_info));
608 make_cleanup (free_elfinfo, (void *) objfile);
610 /* Process the normal ELF symbol table first. This may write some
611 chain of info into the dbx_symfile_info in objfile->deprecated_sym_stab_info,
612 which can later be used by elfstab_offset_sections. */
614 storage_needed = bfd_get_symtab_upper_bound (objfile->obfd);
615 if (storage_needed < 0)
616 error (_("Can't read symbols from %s: %s"), bfd_get_filename (objfile->obfd),
617 bfd_errmsg (bfd_get_error ()));
619 if (storage_needed > 0)
621 symbol_table = (asymbol **) xmalloc (storage_needed);
622 make_cleanup (xfree, symbol_table);
623 symcount = bfd_canonicalize_symtab (objfile->obfd, symbol_table);
626 error (_("Can't read symbols from %s: %s"), bfd_get_filename (objfile->obfd),
627 bfd_errmsg (bfd_get_error ()));
629 elf_symtab_read (objfile, ST_REGULAR, symcount, symbol_table);
632 /* Add the dynamic symbols. */
634 storage_needed = bfd_get_dynamic_symtab_upper_bound (objfile->obfd);
636 if (storage_needed > 0)
638 dyn_symbol_table = (asymbol **) xmalloc (storage_needed);
639 make_cleanup (xfree, dyn_symbol_table);
640 dynsymcount = bfd_canonicalize_dynamic_symtab (objfile->obfd,
644 error (_("Can't read symbols from %s: %s"), bfd_get_filename (objfile->obfd),
645 bfd_errmsg (bfd_get_error ()));
647 elf_symtab_read (objfile, ST_DYNAMIC, dynsymcount, dyn_symbol_table);
650 /* Add synthetic symbols - for instance, names for any PLT entries. */
652 synthcount = bfd_get_synthetic_symtab (abfd, symcount, symbol_table,
653 dynsymcount, dyn_symbol_table,
657 asymbol **synth_symbol_table;
660 make_cleanup (xfree, synthsyms);
661 synth_symbol_table = xmalloc (sizeof (asymbol *) * synthcount);
662 for (i = 0; i < synthcount; i++)
663 synth_symbol_table[i] = synthsyms + i;
664 make_cleanup (xfree, synth_symbol_table);
665 elf_symtab_read (objfile, ST_SYNTHETIC, synthcount, synth_symbol_table);
668 /* Install any minimal symbols that have been collected as the current
669 minimal symbols for this objfile. The debug readers below this point
670 should not generate new minimal symbols; if they do it's their
671 responsibility to install them. "mdebug" appears to be the only one
672 which will do this. */
674 install_minimal_symbols (objfile);
675 do_cleanups (back_to);
677 /* Now process debugging information, which is contained in
678 special ELF sections. */
680 /* If we are reinitializing, or if we have never loaded syms yet,
681 set table to empty. MAINLINE is cleared so that *_read_psymtab
682 functions do not all also re-initialize the psymbol table. */
685 init_psymbol_list (objfile, 0);
689 /* We first have to find them... */
690 bfd_map_over_sections (abfd, elf_locate_sections, (void *) & ei);
692 /* ELF debugging information is inserted into the psymtab in the
693 order of least informative first - most informative last. Since
694 the psymtab table is searched `most recent insertion first' this
695 increases the probability that more detailed debug information
696 for a section is found.
698 For instance, an object file might contain both .mdebug (XCOFF)
699 and .debug_info (DWARF2) sections then .mdebug is inserted first
700 (searched last) and DWARF2 is inserted last (searched first). If
701 we don't do this then the XCOFF info is found first - for code in
702 an included file XCOFF info is useless. */
706 const struct ecoff_debug_swap *swap;
708 /* .mdebug section, presumably holding ECOFF debugging
710 swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap;
712 elfmdebug_build_psymtabs (objfile, swap, ei.mdebugsect);
718 /* Stab sections have an associated string table that looks like
719 a separate section. */
720 str_sect = bfd_get_section_by_name (abfd, ".stabstr");
722 /* FIXME should probably warn about a stab section without a stabstr. */
724 elfstab_build_psymtabs (objfile,
728 bfd_section_size (abfd, str_sect));
730 if (dwarf2_has_info (objfile))
732 /* DWARF 2 sections */
733 dwarf2_build_psymtabs (objfile, mainline);
736 /* FIXME: kettenis/20030504: This still needs to be integrated with
737 dwarf2read.c in a better way. */
738 dwarf2_build_frame_info (objfile);
741 /* This cleans up the objfile's deprecated_sym_stab_info pointer, and
742 the chain of stab_section_info's, that might be dangling from
746 free_elfinfo (void *objp)
748 struct objfile *objfile = (struct objfile *) objp;
749 struct dbx_symfile_info *dbxinfo = objfile->deprecated_sym_stab_info;
750 struct stab_section_info *ssi, *nssi;
752 ssi = dbxinfo->stab_section_info;
760 dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */
764 /* Initialize anything that needs initializing when a completely new symbol
765 file is specified (not just adding some symbols from another file, e.g. a
768 We reinitialize buildsym, since we may be reading stabs from an ELF file. */
771 elf_new_init (struct objfile *ignore)
773 stabsread_new_init ();
774 buildsym_new_init ();
777 /* Perform any local cleanups required when we are done with a particular
778 objfile. I.E, we are in the process of discarding all symbol information
779 for an objfile, freeing up all memory held for it, and unlinking the
780 objfile struct from the global list of known objfiles. */
783 elf_symfile_finish (struct objfile *objfile)
785 if (objfile->deprecated_sym_stab_info != NULL)
787 xfree (objfile->deprecated_sym_stab_info);
790 dwarf2_free_objfile (objfile);
793 /* ELF specific initialization routine for reading symbols.
795 It is passed a pointer to a struct sym_fns which contains, among other
796 things, the BFD for the file whose symbols are being read, and a slot for
797 a pointer to "private data" which we can fill with goodies.
799 For now at least, we have nothing in particular to do, so this function is
803 elf_symfile_init (struct objfile *objfile)
805 /* ELF objects may be reordered, so set OBJF_REORDERED. If we
806 find this causes a significant slowdown in gdb then we could
807 set it in the debug symbol readers only when necessary. */
808 objfile->flags |= OBJF_REORDERED;
811 /* When handling an ELF file that contains Sun STABS debug info,
812 some of the debug info is relative to the particular chunk of the
813 section that was generated in its individual .o file. E.g.
814 offsets to static variables are relative to the start of the data
815 segment *for that module before linking*. This information is
816 painfully squirreled away in the ELF symbol table as local symbols
817 with wierd names. Go get 'em when needed. */
820 elfstab_offset_sections (struct objfile *objfile, struct partial_symtab *pst)
822 char *filename = pst->filename;
823 struct dbx_symfile_info *dbx = objfile->deprecated_sym_stab_info;
824 struct stab_section_info *maybe = dbx->stab_section_info;
825 struct stab_section_info *questionable = 0;
829 /* The ELF symbol info doesn't include path names, so strip the path
830 (if any) from the psymtab filename. */
831 while (0 != (p = strchr (filename, '/')))
834 /* FIXME: This linear search could speed up significantly
835 if it was chained in the right order to match how we search it,
836 and if we unchained when we found a match. */
837 for (; maybe; maybe = maybe->next)
839 if (filename[0] == maybe->filename[0]
840 && strcmp (filename, maybe->filename) == 0)
842 /* We found a match. But there might be several source files
843 (from different directories) with the same name. */
844 if (0 == maybe->found)
846 questionable = maybe; /* Might use it later. */
850 if (maybe == 0 && questionable != 0)
852 complaint (&symfile_complaints,
853 _("elf/stab section information questionable for %s"), filename);
854 maybe = questionable;
859 /* Found it! Allocate a new psymtab struct, and fill it in. */
861 pst->section_offsets = (struct section_offsets *)
862 obstack_alloc (&objfile->objfile_obstack,
863 SIZEOF_N_SECTION_OFFSETS (objfile->num_sections));
864 for (i = 0; i < maybe->num_sections; i++)
865 (pst->section_offsets)->offsets[i] = maybe->sections[i];
869 /* We were unable to find any offsets for this file. Complain. */
870 if (dbx->stab_section_info) /* If there *is* any info, */
871 complaint (&symfile_complaints,
872 _("elf/stab section information missing for %s"), filename);
875 /* Register that we are able to handle ELF object file formats. */
877 static struct sym_fns elf_sym_fns =
879 bfd_target_elf_flavour,
880 elf_new_init, /* sym_new_init: init anything gbl to entire symtab */
881 elf_symfile_init, /* sym_init: read initial info, setup for sym_read() */
882 elf_symfile_read, /* sym_read: read a symbol file into symtab */
883 elf_symfile_finish, /* sym_finish: finished with file, cleanup */
884 default_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */
885 elf_symfile_segments, /* sym_segments: Get segment information from
887 NULL, /* sym_read_linetable */
888 NULL /* next: pointer to next struct sym_fns */
892 _initialize_elfread (void)
894 add_symtab_fns (&elf_sym_fns);