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, 2009, 2010, 2011
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 #include "filenames.h"
44 #include "gdbthread.h"
47 extern void _initialize_elfread (void);
49 /* Forward declarations. */
50 static const struct sym_fns elf_sym_fns_gdb_index;
51 static const struct sym_fns elf_sym_fns_lazy_psyms;
53 /* The struct elfinfo is available only during ELF symbol table and
54 psymtab reading. It is destroyed at the completion of psymtab-reading.
55 It's local to elf_symfile_read. */
59 asection *stabsect; /* Section pointer for .stab section */
60 asection *stabindexsect; /* Section pointer for .stab.index section */
61 asection *mdebugsect; /* Section pointer for .mdebug section */
64 static void free_elfinfo (void *);
66 /* Minimal symbols located at the GOT entries for .plt - that is the real
67 pointer where the given entry will jump to. It gets updated by the real
68 function address during lazy ld.so resolving in the inferior. These
69 minimal symbols are indexed for <tab>-completion. */
71 #define SYMBOL_GOT_PLT_SUFFIX "@got.plt"
73 /* Locate the segments in ABFD. */
75 static struct symfile_segment_data *
76 elf_symfile_segments (bfd *abfd)
78 Elf_Internal_Phdr *phdrs, **segments;
80 int num_phdrs, num_segments, num_sections, i;
82 struct symfile_segment_data *data;
84 phdrs_size = bfd_get_elf_phdr_upper_bound (abfd);
88 phdrs = alloca (phdrs_size);
89 num_phdrs = bfd_get_elf_phdrs (abfd, phdrs);
94 segments = alloca (sizeof (Elf_Internal_Phdr *) * num_phdrs);
95 for (i = 0; i < num_phdrs; i++)
96 if (phdrs[i].p_type == PT_LOAD)
97 segments[num_segments++] = &phdrs[i];
99 if (num_segments == 0)
102 data = XZALLOC (struct symfile_segment_data);
103 data->num_segments = num_segments;
104 data->segment_bases = XCALLOC (num_segments, CORE_ADDR);
105 data->segment_sizes = XCALLOC (num_segments, CORE_ADDR);
107 for (i = 0; i < num_segments; i++)
109 data->segment_bases[i] = segments[i]->p_vaddr;
110 data->segment_sizes[i] = segments[i]->p_memsz;
113 num_sections = bfd_count_sections (abfd);
114 data->segment_info = XCALLOC (num_sections, int);
116 for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next)
121 if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
124 vma = bfd_get_section_vma (abfd, sect);
126 for (j = 0; j < num_segments; j++)
127 if (segments[j]->p_memsz > 0
128 && vma >= segments[j]->p_vaddr
129 && (vma - segments[j]->p_vaddr) < segments[j]->p_memsz)
131 data->segment_info[i] = j + 1;
135 /* We should have found a segment for every non-empty section.
136 If we haven't, we will not relocate this section by any
137 offsets we apply to the segments. As an exception, do not
138 warn about SHT_NOBITS sections; in normal ELF execution
139 environments, SHT_NOBITS means zero-initialized and belongs
140 in a segment, but in no-OS environments some tools (e.g. ARM
141 RealView) use SHT_NOBITS for uninitialized data. Since it is
142 uninitialized, it doesn't need a program header. Such
143 binaries are not relocatable. */
144 if (bfd_get_section_size (sect) > 0 && j == num_segments
145 && (bfd_get_section_flags (abfd, sect) & SEC_LOAD) != 0)
146 warning (_("Loadable segment \"%s\" outside of ELF segments"),
147 bfd_section_name (abfd, sect));
153 /* We are called once per section from elf_symfile_read. We
154 need to examine each section we are passed, check to see
155 if it is something we are interested in processing, and
156 if so, stash away some access information for the section.
158 For now we recognize the dwarf debug information sections and
159 line number sections from matching their section names. The
160 ELF definition is no real help here since it has no direct
161 knowledge of DWARF (by design, so any debugging format can be
164 We also recognize the ".stab" sections used by the Sun compilers
165 released with Solaris 2.
167 FIXME: The section names should not be hardwired strings (what
168 should they be? I don't think most object file formats have enough
169 section flags to specify what kind of debug section it is.
173 elf_locate_sections (bfd *ignore_abfd, asection *sectp, void *eip)
177 ei = (struct elfinfo *) eip;
178 if (strcmp (sectp->name, ".stab") == 0)
180 ei->stabsect = sectp;
182 else if (strcmp (sectp->name, ".stab.index") == 0)
184 ei->stabindexsect = sectp;
186 else if (strcmp (sectp->name, ".mdebug") == 0)
188 ei->mdebugsect = sectp;
192 static struct minimal_symbol *
193 record_minimal_symbol (const char *name, int name_len, int copy_name,
195 enum minimal_symbol_type ms_type,
196 asection *bfd_section, struct objfile *objfile)
198 struct gdbarch *gdbarch = get_objfile_arch (objfile);
200 if (ms_type == mst_text || ms_type == mst_file_text
201 || ms_type == mst_text_gnu_ifunc)
202 address = gdbarch_smash_text_address (gdbarch, address);
204 return prim_record_minimal_symbol_full (name, name_len, copy_name, address,
205 ms_type, bfd_section->index,
206 bfd_section, objfile);
213 elf_symtab_read -- read the symbol table of an ELF file
217 void elf_symtab_read (struct objfile *objfile, int type,
218 long number_of_symbols, asymbol **symbol_table)
222 Given an objfile, a symbol table, and a flag indicating whether the
223 symbol table contains regular, dynamic, or synthetic symbols, add all
224 the global function and data symbols to the minimal symbol table.
226 In stabs-in-ELF, as implemented by Sun, there are some local symbols
227 defined in the ELF symbol table, which can be used to locate
228 the beginnings of sections from each ".o" file that was linked to
229 form the executable objfile. We gather any such info and record it
230 in data structures hung off the objfile's private data.
236 #define ST_SYNTHETIC 2
239 elf_symtab_read (struct objfile *objfile, int type,
240 long number_of_symbols, asymbol **symbol_table,
243 struct gdbarch *gdbarch = get_objfile_arch (objfile);
248 enum minimal_symbol_type ms_type;
249 /* If sectinfo is nonNULL, it contains section info that should end up
250 filed in the objfile. */
251 struct stab_section_info *sectinfo = NULL;
252 /* If filesym is nonzero, it points to a file symbol, but we haven't
253 seen any section info for it yet. */
254 asymbol *filesym = 0;
255 /* Name of filesym. This is either a constant string or is saved on
256 the objfile's obstack. */
257 char *filesymname = "";
258 struct dbx_symfile_info *dbx = objfile->deprecated_sym_stab_info;
259 int stripped = (bfd_get_symcount (objfile->obfd) == 0);
261 for (i = 0; i < number_of_symbols; i++)
263 sym = symbol_table[i];
264 if (sym->name == NULL || *sym->name == '\0')
266 /* Skip names that don't exist (shouldn't happen), or names
267 that are null strings (may happen). */
271 /* Skip "special" symbols, e.g. ARM mapping symbols. These are
272 symbols which do not correspond to objects in the symbol table,
273 but have some other target-specific meaning. */
274 if (bfd_is_target_special_symbol (objfile->obfd, sym))
276 if (gdbarch_record_special_symbol_p (gdbarch))
277 gdbarch_record_special_symbol (gdbarch, objfile, sym);
281 offset = ANOFFSET (objfile->section_offsets, sym->section->index);
282 if (type == ST_DYNAMIC
283 && sym->section == &bfd_und_section
284 && (sym->flags & BSF_FUNCTION))
286 struct minimal_symbol *msym;
287 bfd *abfd = objfile->obfd;
290 /* Symbol is a reference to a function defined in
292 If its value is non zero then it is usually the address
293 of the corresponding entry in the procedure linkage table,
294 plus the desired section offset.
295 If its value is zero then the dynamic linker has to resolve
296 the symbol. We are unable to find any meaningful address
297 for this symbol in the executable file, so we skip it. */
298 symaddr = sym->value;
302 /* sym->section is the undefined section. However, we want to
303 record the section where the PLT stub resides with the
304 minimal symbol. Search the section table for the one that
305 covers the stub's address. */
306 for (sect = abfd->sections; sect != NULL; sect = sect->next)
308 if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
311 if (symaddr >= bfd_get_section_vma (abfd, sect)
312 && symaddr < bfd_get_section_vma (abfd, sect)
313 + bfd_get_section_size (sect))
319 symaddr += ANOFFSET (objfile->section_offsets, sect->index);
321 msym = record_minimal_symbol
322 (sym->name, strlen (sym->name), copy_names,
323 symaddr, mst_solib_trampoline, sect, objfile);
325 msym->filename = filesymname;
329 /* If it is a nonstripped executable, do not enter dynamic
330 symbols, as the dynamic symbol table is usually a subset
331 of the main symbol table. */
332 if (type == ST_DYNAMIC && !stripped)
334 if (sym->flags & BSF_FILE)
336 /* STT_FILE debugging symbol that helps stabs-in-elf debugging.
337 Chain any old one onto the objfile; remember new sym. */
338 if (sectinfo != NULL)
340 sectinfo->next = dbx->stab_section_info;
341 dbx->stab_section_info = sectinfo;
346 obsavestring ((char *) filesym->name, strlen (filesym->name),
347 &objfile->objfile_obstack);
349 else if (sym->flags & BSF_SECTION_SYM)
351 else if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK))
353 struct minimal_symbol *msym;
355 /* Select global/local/weak symbols. Note that bfd puts abs
356 symbols in their own section, so all symbols we are
357 interested in will have a section. */
358 /* Bfd symbols are section relative. */
359 symaddr = sym->value + sym->section->vma;
360 /* Relocate all non-absolute and non-TLS symbols by the
362 if (sym->section != &bfd_abs_section
363 && !(sym->section->flags & SEC_THREAD_LOCAL))
367 /* For non-absolute symbols, use the type of the section
368 they are relative to, to intuit text/data. Bfd provides
369 no way of figuring this out for absolute symbols. */
370 if (sym->section == &bfd_abs_section)
372 /* This is a hack to get the minimal symbol type
373 right for Irix 5, which has absolute addresses
374 with special section indices for dynamic symbols.
376 NOTE: uweigand-20071112: Synthetic symbols do not
377 have an ELF-private part, so do not touch those. */
378 unsigned int shndx = type == ST_SYNTHETIC ? 0 :
379 ((elf_symbol_type *) sym)->internal_elf_sym.st_shndx;
389 case SHN_MIPS_ACOMMON:
396 /* If it is an Irix dynamic symbol, skip section name
397 symbols, relocate all others by section offset. */
398 if (ms_type != mst_abs)
400 if (sym->name[0] == '.')
405 else if (sym->section->flags & SEC_CODE)
407 if (sym->flags & (BSF_GLOBAL | BSF_WEAK))
409 if (sym->flags & BSF_GNU_INDIRECT_FUNCTION)
410 ms_type = mst_text_gnu_ifunc;
414 else if ((sym->name[0] == '.' && sym->name[1] == 'L')
415 || ((sym->flags & BSF_LOCAL)
416 && sym->name[0] == '$'
417 && sym->name[1] == 'L'))
418 /* Looks like a compiler-generated label. Skip
419 it. The assembler should be skipping these (to
420 keep executables small), but apparently with
421 gcc on the (deleted) delta m88k SVR4, it loses.
422 So to have us check too should be harmless (but
423 I encourage people to fix this in the assembler
424 instead of adding checks here). */
428 ms_type = mst_file_text;
431 else if (sym->section->flags & SEC_ALLOC)
433 if (sym->flags & (BSF_GLOBAL | BSF_WEAK))
435 if (sym->section->flags & SEC_LOAD)
444 else if (sym->flags & BSF_LOCAL)
446 /* Named Local variable in a Data section.
447 Check its name for stabs-in-elf. */
448 int special_local_sect;
450 if (strcmp ("Bbss.bss", sym->name) == 0)
451 special_local_sect = SECT_OFF_BSS (objfile);
452 else if (strcmp ("Ddata.data", sym->name) == 0)
453 special_local_sect = SECT_OFF_DATA (objfile);
454 else if (strcmp ("Drodata.rodata", sym->name) == 0)
455 special_local_sect = SECT_OFF_RODATA (objfile);
457 special_local_sect = -1;
458 if (special_local_sect >= 0)
460 /* Found a special local symbol. Allocate a
461 sectinfo, if needed, and fill it in. */
462 if (sectinfo == NULL)
467 max_index = SECT_OFF_BSS (objfile);
468 if (objfile->sect_index_data > max_index)
469 max_index = objfile->sect_index_data;
470 if (objfile->sect_index_rodata > max_index)
471 max_index = objfile->sect_index_rodata;
473 /* max_index is the largest index we'll
474 use into this array, so we must
475 allocate max_index+1 elements for it.
476 However, 'struct stab_section_info'
477 already includes one element, so we
478 need to allocate max_index aadditional
480 size = (sizeof (struct stab_section_info)
481 + (sizeof (CORE_ADDR) * max_index));
482 sectinfo = (struct stab_section_info *)
484 memset (sectinfo, 0, size);
485 sectinfo->num_sections = max_index;
488 complaint (&symfile_complaints,
489 _("elf/stab section information %s "
490 "without a preceding file symbol"),
496 (char *) filesym->name;
499 if (sectinfo->sections[special_local_sect] != 0)
500 complaint (&symfile_complaints,
501 _("duplicated elf/stab section "
502 "information for %s"),
504 /* BFD symbols are section relative. */
505 symaddr = sym->value + sym->section->vma;
506 /* Relocate non-absolute symbols by the
508 if (sym->section != &bfd_abs_section)
510 sectinfo->sections[special_local_sect] = symaddr;
511 /* The special local symbols don't go in the
512 minimal symbol table, so ignore this one. */
515 /* Not a special stabs-in-elf symbol, do regular
516 symbol processing. */
517 if (sym->section->flags & SEC_LOAD)
519 ms_type = mst_file_data;
523 ms_type = mst_file_bss;
528 ms_type = mst_unknown;
533 /* FIXME: Solaris2 shared libraries include lots of
534 odd "absolute" and "undefined" symbols, that play
535 hob with actions like finding what function the PC
536 is in. Ignore them if they aren't text, data, or bss. */
537 /* ms_type = mst_unknown; */
538 continue; /* Skip this symbol. */
540 msym = record_minimal_symbol
541 (sym->name, strlen (sym->name), copy_names, symaddr,
542 ms_type, sym->section, objfile);
546 /* Pass symbol size field in via BFD. FIXME!!! */
547 elf_symbol_type *elf_sym;
549 /* NOTE: uweigand-20071112: A synthetic symbol does not have an
550 ELF-private part. However, in some cases (e.g. synthetic
551 'dot' symbols on ppc64) the udata.p entry is set to point back
552 to the original ELF symbol it was derived from. Get the size
554 if (type != ST_SYNTHETIC)
555 elf_sym = (elf_symbol_type *) sym;
557 elf_sym = (elf_symbol_type *) sym->udata.p;
560 MSYMBOL_SIZE(msym) = elf_sym->internal_elf_sym.st_size;
562 msym->filename = filesymname;
563 gdbarch_elf_make_msymbol_special (gdbarch, sym, msym);
566 /* For @plt symbols, also record a trampoline to the
567 destination symbol. The @plt symbol will be used in
568 disassembly, and the trampoline will be used when we are
569 trying to find the target. */
570 if (msym && ms_type == mst_text && type == ST_SYNTHETIC)
572 int len = strlen (sym->name);
574 if (len > 4 && strcmp (sym->name + len - 4, "@plt") == 0)
576 struct minimal_symbol *mtramp;
578 mtramp = record_minimal_symbol (sym->name, len - 4, 1,
580 mst_solib_trampoline,
581 sym->section, objfile);
584 MSYMBOL_SIZE (mtramp) = MSYMBOL_SIZE (msym);
585 mtramp->filename = filesymname;
586 gdbarch_elf_make_msymbol_special (gdbarch, sym, mtramp);
594 /* Build minimal symbols named `function@got.plt' (see SYMBOL_GOT_PLT_SUFFIX)
595 for later look ups of which function to call when user requests
596 a STT_GNU_IFUNC function. As the STT_GNU_IFUNC type is found at the target
597 library defining `function' we cannot yet know while reading OBJFILE which
598 of the SYMBOL_GOT_PLT_SUFFIX entries will be needed and later
599 DYN_SYMBOL_TABLE is no longer easily available for OBJFILE. */
602 elf_rel_plt_read (struct objfile *objfile, asymbol **dyn_symbol_table)
604 bfd *obfd = objfile->obfd;
605 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
606 asection *plt, *relplt, *got_plt;
609 bfd_size_type reloc_count, reloc;
610 char *string_buffer = NULL;
611 size_t string_buffer_size = 0;
612 struct cleanup *back_to;
613 struct gdbarch *gdbarch = objfile->gdbarch;
614 struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr;
615 size_t ptr_size = TYPE_LENGTH (ptr_type);
617 if (objfile->separate_debug_objfile_backlink)
620 plt = bfd_get_section_by_name (obfd, ".plt");
623 plt_elf_idx = elf_section_data (plt)->this_idx;
625 got_plt = bfd_get_section_by_name (obfd, ".got.plt");
629 /* This search algorithm is from _bfd_elf_canonicalize_dynamic_reloc. */
630 for (relplt = obfd->sections; relplt != NULL; relplt = relplt->next)
631 if (elf_section_data (relplt)->this_hdr.sh_info == plt_elf_idx
632 && (elf_section_data (relplt)->this_hdr.sh_type == SHT_REL
633 || elf_section_data (relplt)->this_hdr.sh_type == SHT_RELA))
638 if (! bed->s->slurp_reloc_table (obfd, relplt, dyn_symbol_table, TRUE))
641 back_to = make_cleanup (free_current_contents, &string_buffer);
643 reloc_count = relplt->size / elf_section_data (relplt)->this_hdr.sh_entsize;
644 for (reloc = 0; reloc < reloc_count; reloc++)
646 const char *name, *name_got_plt;
647 struct minimal_symbol *msym;
649 const size_t got_suffix_len = strlen (SYMBOL_GOT_PLT_SUFFIX);
652 name = bfd_asymbol_name (*relplt->relocation[reloc].sym_ptr_ptr);
653 name_len = strlen (name);
654 address = relplt->relocation[reloc].address;
656 /* Does the pointer reside in the .got.plt section? */
657 if (!(bfd_get_section_vma (obfd, got_plt) <= address
658 && address < bfd_get_section_vma (obfd, got_plt)
659 + bfd_get_section_size (got_plt)))
662 /* We cannot check if NAME is a reference to mst_text_gnu_ifunc as in
663 OBJFILE the symbol is undefined and the objfile having NAME defined
664 may not yet have been loaded. */
666 if (string_buffer_size < name_len + got_suffix_len)
668 string_buffer_size = 2 * (name_len + got_suffix_len);
669 string_buffer = xrealloc (string_buffer, string_buffer_size);
671 memcpy (string_buffer, name, name_len);
672 memcpy (&string_buffer[name_len], SYMBOL_GOT_PLT_SUFFIX,
675 msym = record_minimal_symbol (string_buffer, name_len + got_suffix_len,
676 1, address, mst_slot_got_plt, got_plt,
679 MSYMBOL_SIZE (msym) = ptr_size;
682 do_cleanups (back_to);
685 /* The data pointer is htab_t for gnu_ifunc_record_cache_unchecked. */
687 static const struct objfile_data *elf_objfile_gnu_ifunc_cache_data;
689 /* Map function names to CORE_ADDR in elf_objfile_gnu_ifunc_cache_data. */
691 struct elf_gnu_ifunc_cache
693 /* This is always a function entry address, not a function descriptor. */
699 /* htab_hash for elf_objfile_gnu_ifunc_cache_data. */
702 elf_gnu_ifunc_cache_hash (const void *a_voidp)
704 const struct elf_gnu_ifunc_cache *a = a_voidp;
706 return htab_hash_string (a->name);
709 /* htab_eq for elf_objfile_gnu_ifunc_cache_data. */
712 elf_gnu_ifunc_cache_eq (const void *a_voidp, const void *b_voidp)
714 const struct elf_gnu_ifunc_cache *a = a_voidp;
715 const struct elf_gnu_ifunc_cache *b = b_voidp;
717 return strcmp (a->name, b->name) == 0;
720 /* Record the target function address of a STT_GNU_IFUNC function NAME is the
721 function entry address ADDR. Return 1 if NAME and ADDR are considered as
722 valid and therefore they were successfully recorded, return 0 otherwise.
724 Function does not expect a duplicate entry. Use
725 elf_gnu_ifunc_resolve_by_cache first to check if the entry for NAME already
729 elf_gnu_ifunc_record_cache (const char *name, CORE_ADDR addr)
731 struct minimal_symbol *msym;
733 struct objfile *objfile;
735 struct elf_gnu_ifunc_cache entry_local, *entry_p;
738 msym = lookup_minimal_symbol_by_pc (addr);
741 if (SYMBOL_VALUE_ADDRESS (msym) != addr)
743 /* minimal symbols have always SYMBOL_OBJ_SECTION non-NULL. */
744 sect = SYMBOL_OBJ_SECTION (msym)->the_bfd_section;
745 objfile = SYMBOL_OBJ_SECTION (msym)->objfile;
747 /* If .plt jumps back to .plt the symbol is still deferred for later
748 resolution and it has no use for GDB. Besides ".text" this symbol can
749 reside also in ".opd" for ppc64 function descriptor. */
750 if (strcmp (bfd_get_section_name (objfile->obfd, sect), ".plt") == 0)
753 htab = objfile_data (objfile, elf_objfile_gnu_ifunc_cache_data);
756 htab = htab_create_alloc_ex (1, elf_gnu_ifunc_cache_hash,
757 elf_gnu_ifunc_cache_eq,
758 NULL, &objfile->objfile_obstack,
759 hashtab_obstack_allocate,
760 dummy_obstack_deallocate);
761 set_objfile_data (objfile, elf_objfile_gnu_ifunc_cache_data, htab);
764 entry_local.addr = addr;
765 obstack_grow (&objfile->objfile_obstack, &entry_local,
766 offsetof (struct elf_gnu_ifunc_cache, name));
767 obstack_grow_str0 (&objfile->objfile_obstack, name);
768 entry_p = obstack_finish (&objfile->objfile_obstack);
770 slot = htab_find_slot (htab, entry_p, INSERT);
773 struct elf_gnu_ifunc_cache *entry_found_p = *slot;
774 struct gdbarch *gdbarch = objfile->gdbarch;
776 if (entry_found_p->addr != addr)
778 /* This case indicates buggy inferior program, the resolved address
779 should never change. */
781 warning (_("gnu-indirect-function \"%s\" has changed its resolved "
782 "function_address from %s to %s"),
783 name, paddress (gdbarch, entry_found_p->addr),
784 paddress (gdbarch, addr));
787 /* New ENTRY_P is here leaked/duplicate in the OBJFILE obstack. */
794 /* Try to find the target resolved function entry address of a STT_GNU_IFUNC
795 function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P
796 is not NULL) and the function returns 1. It returns 0 otherwise.
798 Only the elf_objfile_gnu_ifunc_cache_data hash table is searched by this
802 elf_gnu_ifunc_resolve_by_cache (const char *name, CORE_ADDR *addr_p)
804 struct objfile *objfile;
806 ALL_PSPACE_OBJFILES (current_program_space, objfile)
809 struct elf_gnu_ifunc_cache *entry_p;
812 htab = objfile_data (objfile, elf_objfile_gnu_ifunc_cache_data);
816 entry_p = alloca (sizeof (*entry_p) + strlen (name));
817 strcpy (entry_p->name, name);
819 slot = htab_find_slot (htab, entry_p, NO_INSERT);
823 gdb_assert (entry_p != NULL);
826 *addr_p = entry_p->addr;
833 /* Try to find the target resolved function entry address of a STT_GNU_IFUNC
834 function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P
835 is not NULL) and the function returns 1. It returns 0 otherwise.
837 Only the SYMBOL_GOT_PLT_SUFFIX locations are searched by this function.
838 elf_gnu_ifunc_resolve_by_cache must have been already called for NAME to
839 prevent cache entries duplicates. */
842 elf_gnu_ifunc_resolve_by_got (const char *name, CORE_ADDR *addr_p)
845 struct objfile *objfile;
846 const size_t got_suffix_len = strlen (SYMBOL_GOT_PLT_SUFFIX);
848 name_got_plt = alloca (strlen (name) + got_suffix_len + 1);
849 sprintf (name_got_plt, "%s" SYMBOL_GOT_PLT_SUFFIX, name);
851 ALL_PSPACE_OBJFILES (current_program_space, objfile)
853 bfd *obfd = objfile->obfd;
854 struct gdbarch *gdbarch = objfile->gdbarch;
855 struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr;
856 size_t ptr_size = TYPE_LENGTH (ptr_type);
857 CORE_ADDR pointer_address, addr;
859 gdb_byte *buf = alloca (ptr_size);
860 struct minimal_symbol *msym;
862 msym = lookup_minimal_symbol (name_got_plt, NULL, objfile);
865 if (MSYMBOL_TYPE (msym) != mst_slot_got_plt)
867 pointer_address = SYMBOL_VALUE_ADDRESS (msym);
869 plt = bfd_get_section_by_name (obfd, ".plt");
873 if (MSYMBOL_SIZE (msym) != ptr_size)
875 if (target_read_memory (pointer_address, buf, ptr_size) != 0)
877 addr = extract_typed_address (buf, ptr_type);
878 addr = gdbarch_convert_from_func_ptr_addr (gdbarch, addr,
883 if (elf_gnu_ifunc_record_cache (name, addr))
890 /* Try to find the target resolved function entry address of a STT_GNU_IFUNC
891 function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P
892 is not NULL) and the function returns 1. It returns 0 otherwise.
894 Both the elf_objfile_gnu_ifunc_cache_data hash table and
895 SYMBOL_GOT_PLT_SUFFIX locations are searched by this function. */
898 elf_gnu_ifunc_resolve_name (const char *name, CORE_ADDR *addr_p)
900 if (elf_gnu_ifunc_resolve_by_cache (name, addr_p))
903 if (elf_gnu_ifunc_resolve_by_got (name, addr_p))
909 /* Call STT_GNU_IFUNC - a function returning addresss of a real function to
910 call. PC is theSTT_GNU_IFUNC resolving function entry. The value returned
911 is the entry point of the resolved STT_GNU_IFUNC target function to call.
915 elf_gnu_ifunc_resolve_addr (struct gdbarch *gdbarch, CORE_ADDR pc)
918 CORE_ADDR start_at_pc, address;
919 struct type *func_func_type = builtin_type (gdbarch)->builtin_func_func;
920 struct value *function, *address_val;
922 /* Try first any non-intrusive methods without an inferior call. */
924 if (find_pc_partial_function (pc, &name_at_pc, &start_at_pc, NULL)
925 && start_at_pc == pc)
927 if (elf_gnu_ifunc_resolve_name (name_at_pc, &address))
933 function = allocate_value (func_func_type);
934 set_value_address (function, pc);
936 /* STT_GNU_IFUNC resolver functions have no parameters. FUNCTION is the
937 function entry address. ADDRESS may be a function descriptor. */
939 address_val = call_function_by_hand (function, 0, NULL);
940 address = value_as_address (address_val);
941 address = gdbarch_convert_from_func_ptr_addr (gdbarch, address,
945 elf_gnu_ifunc_record_cache (name_at_pc, address);
950 /* Handle inferior hit of bp_gnu_ifunc_resolver, see its definition. */
953 elf_gnu_ifunc_resolver_stop (struct breakpoint *b)
955 struct breakpoint *b_return;
956 struct frame_info *prev_frame = get_prev_frame (get_current_frame ());
957 struct frame_id prev_frame_id = get_stack_frame_id (prev_frame);
958 CORE_ADDR prev_pc = get_frame_pc (prev_frame);
959 int thread_id = pid_to_thread_id (inferior_ptid);
961 gdb_assert (b->type == bp_gnu_ifunc_resolver);
963 for (b_return = b->related_breakpoint; b_return != b;
964 b_return = b_return->related_breakpoint)
966 gdb_assert (b_return->type == bp_gnu_ifunc_resolver_return);
967 gdb_assert (b_return->loc != NULL && b_return->loc->next == NULL);
968 gdb_assert (frame_id_p (b_return->frame_id));
970 if (b_return->thread == thread_id
971 && b_return->loc->requested_address == prev_pc
972 && frame_id_eq (b_return->frame_id, prev_frame_id))
978 struct symtab_and_line sal;
980 /* No need to call find_pc_line for symbols resolving as this is only
981 a helper breakpointer never shown to the user. */
984 sal.pspace = current_inferior ()->pspace;
986 sal.section = find_pc_overlay (sal.pc);
988 b_return = set_momentary_breakpoint (get_frame_arch (prev_frame), sal,
990 bp_gnu_ifunc_resolver_return);
992 /* Add new b_return to the ring list b->related_breakpoint. */
993 gdb_assert (b_return->related_breakpoint == b_return);
994 b_return->related_breakpoint = b->related_breakpoint;
995 b->related_breakpoint = b_return;
999 /* Handle inferior hit of bp_gnu_ifunc_resolver_return, see its definition. */
1002 elf_gnu_ifunc_resolver_return_stop (struct breakpoint *b)
1004 struct gdbarch *gdbarch = get_frame_arch (get_current_frame ());
1005 struct type *func_func_type = builtin_type (gdbarch)->builtin_func_func;
1006 struct type *value_type = TYPE_TARGET_TYPE (func_func_type);
1007 struct regcache *regcache = get_thread_regcache (inferior_ptid);
1008 struct value *value;
1009 CORE_ADDR resolved_address, resolved_pc;
1010 struct symtab_and_line sal;
1011 struct symtabs_and_lines sals, sals_end;
1013 gdb_assert (b->type == bp_gnu_ifunc_resolver_return);
1015 value = allocate_value (value_type);
1016 gdbarch_return_value (gdbarch, func_func_type, value_type, regcache,
1017 value_contents_raw (value), NULL);
1018 resolved_address = value_as_address (value);
1019 resolved_pc = gdbarch_convert_from_func_ptr_addr (gdbarch,
1023 while (b->related_breakpoint != b)
1025 struct breakpoint *b_next = b->related_breakpoint;
1029 case bp_gnu_ifunc_resolver:
1031 case bp_gnu_ifunc_resolver_return:
1032 delete_breakpoint (b);
1035 internal_error (__FILE__, __LINE__,
1036 _("handle_inferior_event: Invalid "
1037 "gnu-indirect-function breakpoint type %d"),
1042 gdb_assert (b->type == bp_gnu_ifunc_resolver);
1044 gdb_assert (current_program_space == b->pspace);
1045 elf_gnu_ifunc_record_cache (b->addr_string, resolved_pc);
1047 sal = find_pc_line (resolved_pc, 0);
1052 b->type = bp_breakpoint;
1053 update_breakpoint_locations (b, sals, sals_end);
1062 /* Locate NT_GNU_BUILD_ID from ABFD and return its content. */
1064 static struct build_id *
1065 build_id_bfd_get (bfd *abfd)
1067 struct build_id *retval;
1069 if (!bfd_check_format (abfd, bfd_object)
1070 || bfd_get_flavour (abfd) != bfd_target_elf_flavour
1071 || elf_tdata (abfd)->build_id == NULL)
1074 retval = xmalloc (sizeof *retval - 1 + elf_tdata (abfd)->build_id_size);
1075 retval->size = elf_tdata (abfd)->build_id_size;
1076 memcpy (retval->data, elf_tdata (abfd)->build_id, retval->size);
1081 /* Return if FILENAME has NT_GNU_BUILD_ID matching the CHECK value. */
1084 build_id_verify (const char *filename, struct build_id *check)
1087 struct build_id *found = NULL;
1090 /* We expect to be silent on the non-existing files. */
1091 abfd = bfd_open_maybe_remote (filename);
1095 found = build_id_bfd_get (abfd);
1098 warning (_("File \"%s\" has no build-id, file skipped"), filename);
1099 else if (found->size != check->size
1100 || memcmp (found->data, check->data, found->size) != 0)
1101 warning (_("File \"%s\" has a different build-id, file skipped"),
1106 gdb_bfd_close_or_warn (abfd);
1114 build_id_to_debug_filename (struct build_id *build_id)
1116 char *link, *debugdir, *retval = NULL;
1118 /* DEBUG_FILE_DIRECTORY/.build-id/ab/cdef */
1119 link = alloca (strlen (debug_file_directory) + (sizeof "/.build-id/" - 1) + 1
1120 + 2 * build_id->size + (sizeof ".debug" - 1) + 1);
1122 /* Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will
1123 cause "/.build-id/..." lookups. */
1125 debugdir = debug_file_directory;
1128 char *s, *debugdir_end;
1129 gdb_byte *data = build_id->data;
1130 size_t size = build_id->size;
1132 while (*debugdir == DIRNAME_SEPARATOR)
1135 debugdir_end = strchr (debugdir, DIRNAME_SEPARATOR);
1136 if (debugdir_end == NULL)
1137 debugdir_end = &debugdir[strlen (debugdir)];
1139 memcpy (link, debugdir, debugdir_end - debugdir);
1140 s = &link[debugdir_end - debugdir];
1141 s += sprintf (s, "/.build-id/");
1145 s += sprintf (s, "%02x", (unsigned) *data++);
1150 s += sprintf (s, "%02x", (unsigned) *data++);
1151 strcpy (s, ".debug");
1153 /* lrealpath() is expensive even for the usually non-existent files. */
1154 if (access (link, F_OK) == 0)
1155 retval = lrealpath (link);
1157 if (retval != NULL && !build_id_verify (retval, build_id))
1166 debugdir = debugdir_end;
1168 while (*debugdir != 0);
1174 find_separate_debug_file_by_buildid (struct objfile *objfile)
1176 struct build_id *build_id;
1178 build_id = build_id_bfd_get (objfile->obfd);
1179 if (build_id != NULL)
1181 char *build_id_name;
1183 build_id_name = build_id_to_debug_filename (build_id);
1185 /* Prevent looping on a stripped .debug file. */
1186 if (build_id_name != NULL
1187 && filename_cmp (build_id_name, objfile->name) == 0)
1189 warning (_("\"%s\": separate debug info file has no debug info"),
1191 xfree (build_id_name);
1193 else if (build_id_name != NULL)
1194 return build_id_name;
1199 /* Scan and build partial symbols for a symbol file.
1200 We have been initialized by a call to elf_symfile_init, which
1201 currently does nothing.
1203 SECTION_OFFSETS is a set of offsets to apply to relocate the symbols
1204 in each section. We simplify it down to a single offset for all
1207 This function only does the minimum work necessary for letting the
1208 user "name" things symbolically; it does not read the entire symtab.
1209 Instead, it reads the external and static symbols and puts them in partial
1210 symbol tables. When more extensive information is requested of a
1211 file, the corresponding partial symbol table is mutated into a full
1212 fledged symbol table by going back and reading the symbols
1215 We look for sections with specific names, to tell us what debug
1216 format to look for: FIXME!!!
1218 elfstab_build_psymtabs() handles STABS symbols;
1219 mdebug_build_psymtabs() handles ECOFF debugging information.
1221 Note that ELF files have a "minimal" symbol table, which looks a lot
1222 like a COFF symbol table, but has only the minimal information necessary
1223 for linking. We process this also, and use the information to
1224 build gdb's minimal symbol table. This gives us some minimal debugging
1225 capability even for files compiled without -g. */
1228 elf_symfile_read (struct objfile *objfile, int symfile_flags)
1230 bfd *abfd = objfile->obfd;
1232 struct cleanup *back_to;
1233 long symcount = 0, dynsymcount = 0, synthcount, storage_needed;
1234 asymbol **symbol_table = NULL, **dyn_symbol_table = NULL;
1237 init_minimal_symbol_collection ();
1238 back_to = make_cleanup_discard_minimal_symbols ();
1240 memset ((char *) &ei, 0, sizeof (ei));
1242 /* Allocate struct to keep track of the symfile. */
1243 objfile->deprecated_sym_stab_info = (struct dbx_symfile_info *)
1244 xmalloc (sizeof (struct dbx_symfile_info));
1245 memset ((char *) objfile->deprecated_sym_stab_info,
1246 0, sizeof (struct dbx_symfile_info));
1247 make_cleanup (free_elfinfo, (void *) objfile);
1249 /* Process the normal ELF symbol table first. This may write some
1250 chain of info into the dbx_symfile_info in
1251 objfile->deprecated_sym_stab_info, which can later be used by
1252 elfstab_offset_sections. */
1254 storage_needed = bfd_get_symtab_upper_bound (objfile->obfd);
1255 if (storage_needed < 0)
1256 error (_("Can't read symbols from %s: %s"),
1257 bfd_get_filename (objfile->obfd),
1258 bfd_errmsg (bfd_get_error ()));
1260 if (storage_needed > 0)
1262 symbol_table = (asymbol **) xmalloc (storage_needed);
1263 make_cleanup (xfree, symbol_table);
1264 symcount = bfd_canonicalize_symtab (objfile->obfd, symbol_table);
1267 error (_("Can't read symbols from %s: %s"),
1268 bfd_get_filename (objfile->obfd),
1269 bfd_errmsg (bfd_get_error ()));
1271 elf_symtab_read (objfile, ST_REGULAR, symcount, symbol_table, 0);
1274 /* Add the dynamic symbols. */
1276 storage_needed = bfd_get_dynamic_symtab_upper_bound (objfile->obfd);
1278 if (storage_needed > 0)
1280 /* Memory gets permanently referenced from ABFD after
1281 bfd_get_synthetic_symtab so it must not get freed before ABFD gets.
1282 It happens only in the case when elf_slurp_reloc_table sees
1283 asection->relocation NULL. Determining which section is asection is
1284 done by _bfd_elf_get_synthetic_symtab which is all a bfd
1285 implementation detail, though. */
1287 dyn_symbol_table = bfd_alloc (abfd, storage_needed);
1288 dynsymcount = bfd_canonicalize_dynamic_symtab (objfile->obfd,
1291 if (dynsymcount < 0)
1292 error (_("Can't read symbols from %s: %s"),
1293 bfd_get_filename (objfile->obfd),
1294 bfd_errmsg (bfd_get_error ()));
1296 elf_symtab_read (objfile, ST_DYNAMIC, dynsymcount, dyn_symbol_table, 0);
1298 elf_rel_plt_read (objfile, dyn_symbol_table);
1301 /* Add synthetic symbols - for instance, names for any PLT entries. */
1303 synthcount = bfd_get_synthetic_symtab (abfd, symcount, symbol_table,
1304 dynsymcount, dyn_symbol_table,
1308 asymbol **synth_symbol_table;
1311 make_cleanup (xfree, synthsyms);
1312 synth_symbol_table = xmalloc (sizeof (asymbol *) * synthcount);
1313 for (i = 0; i < synthcount; i++)
1314 synth_symbol_table[i] = synthsyms + i;
1315 make_cleanup (xfree, synth_symbol_table);
1316 elf_symtab_read (objfile, ST_SYNTHETIC, synthcount,
1317 synth_symbol_table, 1);
1320 /* Install any minimal symbols that have been collected as the current
1321 minimal symbols for this objfile. The debug readers below this point
1322 should not generate new minimal symbols; if they do it's their
1323 responsibility to install them. "mdebug" appears to be the only one
1324 which will do this. */
1326 install_minimal_symbols (objfile);
1327 do_cleanups (back_to);
1329 /* Now process debugging information, which is contained in
1330 special ELF sections. */
1332 /* We first have to find them... */
1333 bfd_map_over_sections (abfd, elf_locate_sections, (void *) & ei);
1335 /* ELF debugging information is inserted into the psymtab in the
1336 order of least informative first - most informative last. Since
1337 the psymtab table is searched `most recent insertion first' this
1338 increases the probability that more detailed debug information
1339 for a section is found.
1341 For instance, an object file might contain both .mdebug (XCOFF)
1342 and .debug_info (DWARF2) sections then .mdebug is inserted first
1343 (searched last) and DWARF2 is inserted last (searched first). If
1344 we don't do this then the XCOFF info is found first - for code in
1345 an included file XCOFF info is useless. */
1349 const struct ecoff_debug_swap *swap;
1351 /* .mdebug section, presumably holding ECOFF debugging
1353 swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap;
1355 elfmdebug_build_psymtabs (objfile, swap, ei.mdebugsect);
1361 /* Stab sections have an associated string table that looks like
1362 a separate section. */
1363 str_sect = bfd_get_section_by_name (abfd, ".stabstr");
1365 /* FIXME should probably warn about a stab section without a stabstr. */
1367 elfstab_build_psymtabs (objfile,
1370 bfd_section_size (abfd, str_sect));
1373 if (dwarf2_has_info (objfile))
1375 /* elf_sym_fns_gdb_index cannot handle simultaneous non-DWARF debug
1376 information present in OBJFILE. If there is such debug info present
1377 never use .gdb_index. */
1379 if (!objfile_has_partial_symbols (objfile)
1380 && dwarf2_initialize_objfile (objfile))
1381 objfile->sf = &elf_sym_fns_gdb_index;
1384 /* It is ok to do this even if the stabs reader made some
1385 partial symbols, because OBJF_PSYMTABS_READ has not been
1386 set, and so our lazy reader function will still be called
1388 objfile->sf = &elf_sym_fns_lazy_psyms;
1391 /* If the file has its own symbol tables it has no separate debug
1392 info. `.dynsym'/`.symtab' go to MSYMBOLS, `.debug_info' goes to
1393 SYMTABS/PSYMTABS. `.gnu_debuglink' may no longer be present with
1394 `.note.gnu.build-id'. */
1395 else if (!objfile_has_partial_symbols (objfile))
1399 debugfile = find_separate_debug_file_by_buildid (objfile);
1401 if (debugfile == NULL)
1402 debugfile = find_separate_debug_file_by_debuglink (objfile);
1406 bfd *abfd = symfile_bfd_open (debugfile);
1408 symbol_file_add_separate (abfd, symfile_flags, objfile);
1414 /* Callback to lazily read psymtabs. */
1417 read_psyms (struct objfile *objfile)
1419 if (dwarf2_has_info (objfile))
1420 dwarf2_build_psymtabs (objfile);
1423 /* This cleans up the objfile's deprecated_sym_stab_info pointer, and
1424 the chain of stab_section_info's, that might be dangling from
1428 free_elfinfo (void *objp)
1430 struct objfile *objfile = (struct objfile *) objp;
1431 struct dbx_symfile_info *dbxinfo = objfile->deprecated_sym_stab_info;
1432 struct stab_section_info *ssi, *nssi;
1434 ssi = dbxinfo->stab_section_info;
1442 dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */
1446 /* Initialize anything that needs initializing when a completely new symbol
1447 file is specified (not just adding some symbols from another file, e.g. a
1450 We reinitialize buildsym, since we may be reading stabs from an ELF
1454 elf_new_init (struct objfile *ignore)
1456 stabsread_new_init ();
1457 buildsym_new_init ();
1460 /* Perform any local cleanups required when we are done with a particular
1461 objfile. I.E, we are in the process of discarding all symbol information
1462 for an objfile, freeing up all memory held for it, and unlinking the
1463 objfile struct from the global list of known objfiles. */
1466 elf_symfile_finish (struct objfile *objfile)
1468 if (objfile->deprecated_sym_stab_info != NULL)
1470 xfree (objfile->deprecated_sym_stab_info);
1473 dwarf2_free_objfile (objfile);
1476 /* ELF specific initialization routine for reading symbols.
1478 It is passed a pointer to a struct sym_fns which contains, among other
1479 things, the BFD for the file whose symbols are being read, and a slot for
1480 a pointer to "private data" which we can fill with goodies.
1482 For now at least, we have nothing in particular to do, so this function is
1486 elf_symfile_init (struct objfile *objfile)
1488 /* ELF objects may be reordered, so set OBJF_REORDERED. If we
1489 find this causes a significant slowdown in gdb then we could
1490 set it in the debug symbol readers only when necessary. */
1491 objfile->flags |= OBJF_REORDERED;
1494 /* When handling an ELF file that contains Sun STABS debug info,
1495 some of the debug info is relative to the particular chunk of the
1496 section that was generated in its individual .o file. E.g.
1497 offsets to static variables are relative to the start of the data
1498 segment *for that module before linking*. This information is
1499 painfully squirreled away in the ELF symbol table as local symbols
1500 with wierd names. Go get 'em when needed. */
1503 elfstab_offset_sections (struct objfile *objfile, struct partial_symtab *pst)
1505 const char *filename = pst->filename;
1506 struct dbx_symfile_info *dbx = objfile->deprecated_sym_stab_info;
1507 struct stab_section_info *maybe = dbx->stab_section_info;
1508 struct stab_section_info *questionable = 0;
1511 /* The ELF symbol info doesn't include path names, so strip the path
1512 (if any) from the psymtab filename. */
1513 filename = lbasename (filename);
1515 /* FIXME: This linear search could speed up significantly
1516 if it was chained in the right order to match how we search it,
1517 and if we unchained when we found a match. */
1518 for (; maybe; maybe = maybe->next)
1520 if (filename[0] == maybe->filename[0]
1521 && filename_cmp (filename, maybe->filename) == 0)
1523 /* We found a match. But there might be several source files
1524 (from different directories) with the same name. */
1525 if (0 == maybe->found)
1527 questionable = maybe; /* Might use it later. */
1531 if (maybe == 0 && questionable != 0)
1533 complaint (&symfile_complaints,
1534 _("elf/stab section information questionable for %s"),
1536 maybe = questionable;
1541 /* Found it! Allocate a new psymtab struct, and fill it in. */
1543 pst->section_offsets = (struct section_offsets *)
1544 obstack_alloc (&objfile->objfile_obstack,
1545 SIZEOF_N_SECTION_OFFSETS (objfile->num_sections));
1546 for (i = 0; i < maybe->num_sections; i++)
1547 (pst->section_offsets)->offsets[i] = maybe->sections[i];
1551 /* We were unable to find any offsets for this file. Complain. */
1552 if (dbx->stab_section_info) /* If there *is* any info, */
1553 complaint (&symfile_complaints,
1554 _("elf/stab section information missing for %s"), filename);
1557 /* Register that we are able to handle ELF object file formats. */
1559 static const struct sym_fns elf_sym_fns =
1561 bfd_target_elf_flavour,
1562 elf_new_init, /* init anything gbl to entire symtab */
1563 elf_symfile_init, /* read initial info, setup for sym_read() */
1564 elf_symfile_read, /* read a symbol file into symtab */
1565 NULL, /* sym_read_psymbols */
1566 elf_symfile_finish, /* finished with file, cleanup */
1567 default_symfile_offsets, /* Translate ext. to int. relocation */
1568 elf_symfile_segments, /* Get segment information from a file. */
1570 default_symfile_relocate, /* Relocate a debug section. */
1574 /* The same as elf_sym_fns, but not registered and lazily reads
1577 static const struct sym_fns elf_sym_fns_lazy_psyms =
1579 bfd_target_elf_flavour,
1580 elf_new_init, /* init anything gbl to entire symtab */
1581 elf_symfile_init, /* read initial info, setup for sym_read() */
1582 elf_symfile_read, /* read a symbol file into symtab */
1583 read_psyms, /* sym_read_psymbols */
1584 elf_symfile_finish, /* finished with file, cleanup */
1585 default_symfile_offsets, /* Translate ext. to int. relocation */
1586 elf_symfile_segments, /* Get segment information from a file. */
1588 default_symfile_relocate, /* Relocate a debug section. */
1592 /* The same as elf_sym_fns, but not registered and uses the
1593 DWARF-specific GNU index rather than psymtab. */
1594 static const struct sym_fns elf_sym_fns_gdb_index =
1596 bfd_target_elf_flavour,
1597 elf_new_init, /* init anything gbl to entire symab */
1598 elf_symfile_init, /* read initial info, setup for sym_red() */
1599 elf_symfile_read, /* read a symbol file into symtab */
1600 NULL, /* sym_read_psymbols */
1601 elf_symfile_finish, /* finished with file, cleanup */
1602 default_symfile_offsets, /* Translate ext. to int. relocatin */
1603 elf_symfile_segments, /* Get segment information from a file. */
1605 default_symfile_relocate, /* Relocate a debug section. */
1606 &dwarf2_gdb_index_functions
1609 /* STT_GNU_IFUNC resolver vector to be installed to gnu_ifunc_fns_p. */
1611 static const struct gnu_ifunc_fns elf_gnu_ifunc_fns =
1613 elf_gnu_ifunc_resolve_addr,
1614 elf_gnu_ifunc_resolve_name,
1615 elf_gnu_ifunc_resolver_stop,
1616 elf_gnu_ifunc_resolver_return_stop
1620 _initialize_elfread (void)
1622 add_symtab_fns (&elf_sym_fns);
1624 elf_objfile_gnu_ifunc_cache_data = register_objfile_data ();
1625 gnu_ifunc_fns_p = &elf_gnu_ifunc_fns;