1 /* Read ELF (Executable and Linking Format) object files for GDB.
3 Copyright (C) 1991-2015 Free Software Foundation, Inc.
5 Written by Fred Fish at Cygnus Support.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
25 #include "elf/common.h"
26 #include "elf/internal.h"
32 #include "stabsread.h"
33 #include "gdb-stabs.h"
34 #include "complaints.h"
37 #include "filenames.h"
39 #include "arch-utils.h"
43 #include "gdbthread.h"
50 extern void _initialize_elfread (void);
52 /* Forward declarations. */
53 extern const struct sym_fns elf_sym_fns_gdb_index
;
54 extern const struct sym_fns elf_sym_fns_lazy_psyms
;
56 /* The struct elfinfo is available only during ELF symbol table and
57 psymtab reading. It is destroyed at the completion of psymtab-reading.
58 It's local to elf_symfile_read. */
62 asection
*stabsect
; /* Section pointer for .stab section */
63 asection
*mdebugsect
; /* Section pointer for .mdebug section */
66 /* Per-BFD data for probe info. */
68 static const struct bfd_data
*probe_key
= NULL
;
70 /* Minimal symbols located at the GOT entries for .plt - that is the real
71 pointer where the given entry will jump to. It gets updated by the real
72 function address during lazy ld.so resolving in the inferior. These
73 minimal symbols are indexed for <tab>-completion. */
75 #define SYMBOL_GOT_PLT_SUFFIX "@got.plt"
77 /* Locate the segments in ABFD. */
79 static struct symfile_segment_data
*
80 elf_symfile_segments (bfd
*abfd
)
82 Elf_Internal_Phdr
*phdrs
, **segments
;
84 int num_phdrs
, num_segments
, num_sections
, i
;
86 struct symfile_segment_data
*data
;
88 phdrs_size
= bfd_get_elf_phdr_upper_bound (abfd
);
92 phdrs
= (Elf_Internal_Phdr
*) alloca (phdrs_size
);
93 num_phdrs
= bfd_get_elf_phdrs (abfd
, phdrs
);
98 segments
= XALLOCAVEC (Elf_Internal_Phdr
*, num_phdrs
);
99 for (i
= 0; i
< num_phdrs
; i
++)
100 if (phdrs
[i
].p_type
== PT_LOAD
)
101 segments
[num_segments
++] = &phdrs
[i
];
103 if (num_segments
== 0)
106 data
= XCNEW (struct symfile_segment_data
);
107 data
->num_segments
= num_segments
;
108 data
->segment_bases
= XCNEWVEC (CORE_ADDR
, num_segments
);
109 data
->segment_sizes
= XCNEWVEC (CORE_ADDR
, num_segments
);
111 for (i
= 0; i
< num_segments
; i
++)
113 data
->segment_bases
[i
] = segments
[i
]->p_vaddr
;
114 data
->segment_sizes
[i
] = segments
[i
]->p_memsz
;
117 num_sections
= bfd_count_sections (abfd
);
118 data
->segment_info
= XCNEWVEC (int, num_sections
);
120 for (i
= 0, sect
= abfd
->sections
; sect
!= NULL
; i
++, sect
= sect
->next
)
125 if ((bfd_get_section_flags (abfd
, sect
) & SEC_ALLOC
) == 0)
128 vma
= bfd_get_section_vma (abfd
, sect
);
130 for (j
= 0; j
< num_segments
; j
++)
131 if (segments
[j
]->p_memsz
> 0
132 && vma
>= segments
[j
]->p_vaddr
133 && (vma
- segments
[j
]->p_vaddr
) < segments
[j
]->p_memsz
)
135 data
->segment_info
[i
] = j
+ 1;
139 /* We should have found a segment for every non-empty section.
140 If we haven't, we will not relocate this section by any
141 offsets we apply to the segments. As an exception, do not
142 warn about SHT_NOBITS sections; in normal ELF execution
143 environments, SHT_NOBITS means zero-initialized and belongs
144 in a segment, but in no-OS environments some tools (e.g. ARM
145 RealView) use SHT_NOBITS for uninitialized data. Since it is
146 uninitialized, it doesn't need a program header. Such
147 binaries are not relocatable. */
148 if (bfd_get_section_size (sect
) > 0 && j
== num_segments
149 && (bfd_get_section_flags (abfd
, sect
) & SEC_LOAD
) != 0)
150 warning (_("Loadable section \"%s\" outside of ELF segments"),
151 bfd_section_name (abfd
, sect
));
157 /* We are called once per section from elf_symfile_read. We
158 need to examine each section we are passed, check to see
159 if it is something we are interested in processing, and
160 if so, stash away some access information for the section.
162 For now we recognize the dwarf debug information sections and
163 line number sections from matching their section names. The
164 ELF definition is no real help here since it has no direct
165 knowledge of DWARF (by design, so any debugging format can be
168 We also recognize the ".stab" sections used by the Sun compilers
169 released with Solaris 2.
171 FIXME: The section names should not be hardwired strings (what
172 should they be? I don't think most object file formats have enough
173 section flags to specify what kind of debug section it is.
177 elf_locate_sections (bfd
*ignore_abfd
, asection
*sectp
, void *eip
)
181 ei
= (struct elfinfo
*) eip
;
182 if (strcmp (sectp
->name
, ".stab") == 0)
184 ei
->stabsect
= 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_addr_bits_remove (gdbarch
, address
);
204 return prim_record_minimal_symbol_full (name
, name_len
, copy_name
, address
,
206 gdb_bfd_section_index (objfile
->obfd
,
211 /* Read the symbol table of an ELF file.
213 Given an objfile, a symbol table, and a flag indicating whether the
214 symbol table contains regular, dynamic, or synthetic symbols, add all
215 the global function and data symbols to the minimal symbol table.
217 In stabs-in-ELF, as implemented by Sun, there are some local symbols
218 defined in the ELF symbol table, which can be used to locate
219 the beginnings of sections from each ".o" file that was linked to
220 form the executable objfile. We gather any such info and record it
221 in data structures hung off the objfile's private data. */
225 #define ST_SYNTHETIC 2
228 elf_symtab_read (struct objfile
*objfile
, int type
,
229 long number_of_symbols
, asymbol
**symbol_table
,
232 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
237 enum minimal_symbol_type ms_type
;
238 /* Name of the last file symbol. This is either a constant string or is
239 saved on the objfile's filename cache. */
240 const char *filesymname
= "";
241 struct dbx_symfile_info
*dbx
= DBX_SYMFILE_INFO (objfile
);
242 int stripped
= (bfd_get_symcount (objfile
->obfd
) == 0);
243 int elf_make_msymbol_special_p
244 = gdbarch_elf_make_msymbol_special_p (gdbarch
);
246 for (i
= 0; i
< number_of_symbols
; i
++)
248 sym
= symbol_table
[i
];
249 if (sym
->name
== NULL
|| *sym
->name
== '\0')
251 /* Skip names that don't exist (shouldn't happen), or names
252 that are null strings (may happen). */
256 /* Skip "special" symbols, e.g. ARM mapping symbols. These are
257 symbols which do not correspond to objects in the symbol table,
258 but have some other target-specific meaning. */
259 if (bfd_is_target_special_symbol (objfile
->obfd
, sym
))
261 if (gdbarch_record_special_symbol_p (gdbarch
))
262 gdbarch_record_special_symbol (gdbarch
, objfile
, sym
);
266 offset
= ANOFFSET (objfile
->section_offsets
,
267 gdb_bfd_section_index (objfile
->obfd
, sym
->section
));
268 if (type
== ST_DYNAMIC
269 && sym
->section
== bfd_und_section_ptr
270 && (sym
->flags
& BSF_FUNCTION
))
272 struct minimal_symbol
*msym
;
273 bfd
*abfd
= objfile
->obfd
;
276 /* Symbol is a reference to a function defined in
278 If its value is non zero then it is usually the address
279 of the corresponding entry in the procedure linkage table,
280 plus the desired section offset.
281 If its value is zero then the dynamic linker has to resolve
282 the symbol. We are unable to find any meaningful address
283 for this symbol in the executable file, so we skip it. */
284 symaddr
= sym
->value
;
288 /* sym->section is the undefined section. However, we want to
289 record the section where the PLT stub resides with the
290 minimal symbol. Search the section table for the one that
291 covers the stub's address. */
292 for (sect
= abfd
->sections
; sect
!= NULL
; sect
= sect
->next
)
294 if ((bfd_get_section_flags (abfd
, sect
) & SEC_ALLOC
) == 0)
297 if (symaddr
>= bfd_get_section_vma (abfd
, sect
)
298 && symaddr
< bfd_get_section_vma (abfd
, sect
)
299 + bfd_get_section_size (sect
))
305 /* On ia64-hpux, we have discovered that the system linker
306 adds undefined symbols with nonzero addresses that cannot
307 be right (their address points inside the code of another
308 function in the .text section). This creates problems
309 when trying to determine which symbol corresponds to
312 We try to detect those buggy symbols by checking which
313 section we think they correspond to. Normally, PLT symbols
314 are stored inside their own section, and the typical name
315 for that section is ".plt". So, if there is a ".plt"
316 section, and yet the section name of our symbol does not
317 start with ".plt", we ignore that symbol. */
318 if (!startswith (sect
->name
, ".plt")
319 && bfd_get_section_by_name (abfd
, ".plt") != NULL
)
322 msym
= record_minimal_symbol
323 (sym
->name
, strlen (sym
->name
), copy_names
,
324 symaddr
, mst_solib_trampoline
, sect
, objfile
);
327 msym
->filename
= filesymname
;
328 if (elf_make_msymbol_special_p
)
329 gdbarch_elf_make_msymbol_special (gdbarch
, sym
, msym
);
334 /* If it is a nonstripped executable, do not enter dynamic
335 symbols, as the dynamic symbol table is usually a subset
336 of the main symbol table. */
337 if (type
== ST_DYNAMIC
&& !stripped
)
339 if (sym
->flags
& BSF_FILE
)
341 filesymname
= bcache (sym
->name
, strlen (sym
->name
) + 1,
342 objfile
->per_bfd
->filename_cache
);
344 else if (sym
->flags
& BSF_SECTION_SYM
)
346 else if (sym
->flags
& (BSF_GLOBAL
| BSF_LOCAL
| BSF_WEAK
349 struct minimal_symbol
*msym
;
351 /* Select global/local/weak symbols. Note that bfd puts abs
352 symbols in their own section, so all symbols we are
353 interested in will have a section. */
354 /* Bfd symbols are section relative. */
355 symaddr
= sym
->value
+ sym
->section
->vma
;
356 /* For non-absolute symbols, use the type of the section
357 they are relative to, to intuit text/data. Bfd provides
358 no way of figuring this out for absolute symbols. */
359 if (sym
->section
== bfd_abs_section_ptr
)
361 /* This is a hack to get the minimal symbol type
362 right for Irix 5, which has absolute addresses
363 with special section indices for dynamic symbols.
365 NOTE: uweigand-20071112: Synthetic symbols do not
366 have an ELF-private part, so do not touch those. */
367 unsigned int shndx
= type
== ST_SYNTHETIC
? 0 :
368 ((elf_symbol_type
*) sym
)->internal_elf_sym
.st_shndx
;
378 case SHN_MIPS_ACOMMON
:
385 /* If it is an Irix dynamic symbol, skip section name
386 symbols, relocate all others by section offset. */
387 if (ms_type
!= mst_abs
)
389 if (sym
->name
[0] == '.')
393 else if (sym
->section
->flags
& SEC_CODE
)
395 if (sym
->flags
& (BSF_GLOBAL
| BSF_WEAK
| BSF_GNU_UNIQUE
))
397 if (sym
->flags
& BSF_GNU_INDIRECT_FUNCTION
)
398 ms_type
= mst_text_gnu_ifunc
;
402 /* The BSF_SYNTHETIC check is there to omit ppc64 function
403 descriptors mistaken for static functions starting with 'L'.
405 else if ((sym
->name
[0] == '.' && sym
->name
[1] == 'L'
406 && (sym
->flags
& BSF_SYNTHETIC
) == 0)
407 || ((sym
->flags
& BSF_LOCAL
)
408 && sym
->name
[0] == '$'
409 && sym
->name
[1] == 'L'))
410 /* Looks like a compiler-generated label. Skip
411 it. The assembler should be skipping these (to
412 keep executables small), but apparently with
413 gcc on the (deleted) delta m88k SVR4, it loses.
414 So to have us check too should be harmless (but
415 I encourage people to fix this in the assembler
416 instead of adding checks here). */
420 ms_type
= mst_file_text
;
423 else if (sym
->section
->flags
& SEC_ALLOC
)
425 if (sym
->flags
& (BSF_GLOBAL
| BSF_WEAK
| BSF_GNU_UNIQUE
))
427 if (sym
->section
->flags
& SEC_LOAD
)
436 else if (sym
->flags
& BSF_LOCAL
)
438 if (sym
->section
->flags
& SEC_LOAD
)
440 ms_type
= mst_file_data
;
444 ms_type
= mst_file_bss
;
449 ms_type
= mst_unknown
;
454 /* FIXME: Solaris2 shared libraries include lots of
455 odd "absolute" and "undefined" symbols, that play
456 hob with actions like finding what function the PC
457 is in. Ignore them if they aren't text, data, or bss. */
458 /* ms_type = mst_unknown; */
459 continue; /* Skip this symbol. */
461 msym
= record_minimal_symbol
462 (sym
->name
, strlen (sym
->name
), copy_names
, symaddr
,
463 ms_type
, sym
->section
, objfile
);
467 /* NOTE: uweigand-20071112: A synthetic symbol does not have an
469 if (type
!= ST_SYNTHETIC
)
471 /* Pass symbol size field in via BFD. FIXME!!! */
472 elf_symbol_type
*elf_sym
= (elf_symbol_type
*) sym
;
473 SET_MSYMBOL_SIZE (msym
, elf_sym
->internal_elf_sym
.st_size
);
476 msym
->filename
= filesymname
;
477 if (elf_make_msymbol_special_p
)
478 gdbarch_elf_make_msymbol_special (gdbarch
, sym
, msym
);
481 /* If we see a default versioned symbol, install it under
482 its version-less name. */
485 const char *atsign
= strchr (sym
->name
, '@');
487 if (atsign
!= NULL
&& atsign
[1] == '@' && atsign
> sym
->name
)
489 int len
= atsign
- sym
->name
;
491 record_minimal_symbol (sym
->name
, len
, 1, symaddr
,
492 ms_type
, sym
->section
, objfile
);
496 /* For @plt symbols, also record a trampoline to the
497 destination symbol. The @plt symbol will be used in
498 disassembly, and the trampoline will be used when we are
499 trying to find the target. */
500 if (msym
&& ms_type
== mst_text
&& type
== ST_SYNTHETIC
)
502 int len
= strlen (sym
->name
);
504 if (len
> 4 && strcmp (sym
->name
+ len
- 4, "@plt") == 0)
506 struct minimal_symbol
*mtramp
;
508 mtramp
= record_minimal_symbol (sym
->name
, len
- 4, 1,
510 mst_solib_trampoline
,
511 sym
->section
, objfile
);
514 SET_MSYMBOL_SIZE (mtramp
, MSYMBOL_SIZE (msym
));
515 mtramp
->created_by_gdb
= 1;
516 mtramp
->filename
= filesymname
;
517 if (elf_make_msymbol_special_p
)
518 gdbarch_elf_make_msymbol_special (gdbarch
,
527 /* Build minimal symbols named `function@got.plt' (see SYMBOL_GOT_PLT_SUFFIX)
528 for later look ups of which function to call when user requests
529 a STT_GNU_IFUNC function. As the STT_GNU_IFUNC type is found at the target
530 library defining `function' we cannot yet know while reading OBJFILE which
531 of the SYMBOL_GOT_PLT_SUFFIX entries will be needed and later
532 DYN_SYMBOL_TABLE is no longer easily available for OBJFILE. */
535 elf_rel_plt_read (struct objfile
*objfile
, asymbol
**dyn_symbol_table
)
537 bfd
*obfd
= objfile
->obfd
;
538 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
539 asection
*plt
, *relplt
, *got_plt
;
541 bfd_size_type reloc_count
, reloc
;
542 char *string_buffer
= NULL
;
543 size_t string_buffer_size
= 0;
544 struct cleanup
*back_to
;
545 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
546 struct type
*ptr_type
= builtin_type (gdbarch
)->builtin_data_ptr
;
547 size_t ptr_size
= TYPE_LENGTH (ptr_type
);
549 if (objfile
->separate_debug_objfile_backlink
)
552 plt
= bfd_get_section_by_name (obfd
, ".plt");
555 plt_elf_idx
= elf_section_data (plt
)->this_idx
;
557 got_plt
= bfd_get_section_by_name (obfd
, ".got.plt");
560 /* For platforms where there is no separate .got.plt. */
561 got_plt
= bfd_get_section_by_name (obfd
, ".got");
566 /* This search algorithm is from _bfd_elf_canonicalize_dynamic_reloc. */
567 for (relplt
= obfd
->sections
; relplt
!= NULL
; relplt
= relplt
->next
)
568 if (elf_section_data (relplt
)->this_hdr
.sh_info
== plt_elf_idx
569 && (elf_section_data (relplt
)->this_hdr
.sh_type
== SHT_REL
570 || elf_section_data (relplt
)->this_hdr
.sh_type
== SHT_RELA
))
575 if (! bed
->s
->slurp_reloc_table (obfd
, relplt
, dyn_symbol_table
, TRUE
))
578 back_to
= make_cleanup (free_current_contents
, &string_buffer
);
580 reloc_count
= relplt
->size
/ elf_section_data (relplt
)->this_hdr
.sh_entsize
;
581 for (reloc
= 0; reloc
< reloc_count
; reloc
++)
584 struct minimal_symbol
*msym
;
586 const size_t got_suffix_len
= strlen (SYMBOL_GOT_PLT_SUFFIX
);
589 name
= bfd_asymbol_name (*relplt
->relocation
[reloc
].sym_ptr_ptr
);
590 name_len
= strlen (name
);
591 address
= relplt
->relocation
[reloc
].address
;
593 /* Does the pointer reside in the .got.plt section? */
594 if (!(bfd_get_section_vma (obfd
, got_plt
) <= address
595 && address
< bfd_get_section_vma (obfd
, got_plt
)
596 + bfd_get_section_size (got_plt
)))
599 /* We cannot check if NAME is a reference to mst_text_gnu_ifunc as in
600 OBJFILE the symbol is undefined and the objfile having NAME defined
601 may not yet have been loaded. */
603 if (string_buffer_size
< name_len
+ got_suffix_len
+ 1)
605 string_buffer_size
= 2 * (name_len
+ got_suffix_len
);
606 string_buffer
= (char *) xrealloc (string_buffer
, string_buffer_size
);
608 memcpy (string_buffer
, name
, name_len
);
609 memcpy (&string_buffer
[name_len
], SYMBOL_GOT_PLT_SUFFIX
,
612 msym
= record_minimal_symbol (string_buffer
, name_len
+ got_suffix_len
,
613 1, address
, mst_slot_got_plt
, got_plt
,
616 SET_MSYMBOL_SIZE (msym
, ptr_size
);
619 do_cleanups (back_to
);
622 /* The data pointer is htab_t for gnu_ifunc_record_cache_unchecked. */
624 static const struct objfile_data
*elf_objfile_gnu_ifunc_cache_data
;
626 /* Map function names to CORE_ADDR in elf_objfile_gnu_ifunc_cache_data. */
628 struct elf_gnu_ifunc_cache
630 /* This is always a function entry address, not a function descriptor. */
636 /* htab_hash for elf_objfile_gnu_ifunc_cache_data. */
639 elf_gnu_ifunc_cache_hash (const void *a_voidp
)
641 const struct elf_gnu_ifunc_cache
*a
= a_voidp
;
643 return htab_hash_string (a
->name
);
646 /* htab_eq for elf_objfile_gnu_ifunc_cache_data. */
649 elf_gnu_ifunc_cache_eq (const void *a_voidp
, const void *b_voidp
)
651 const struct elf_gnu_ifunc_cache
*a
= a_voidp
;
652 const struct elf_gnu_ifunc_cache
*b
= b_voidp
;
654 return strcmp (a
->name
, b
->name
) == 0;
657 /* Record the target function address of a STT_GNU_IFUNC function NAME is the
658 function entry address ADDR. Return 1 if NAME and ADDR are considered as
659 valid and therefore they were successfully recorded, return 0 otherwise.
661 Function does not expect a duplicate entry. Use
662 elf_gnu_ifunc_resolve_by_cache first to check if the entry for NAME already
666 elf_gnu_ifunc_record_cache (const char *name
, CORE_ADDR addr
)
668 struct bound_minimal_symbol msym
;
670 struct objfile
*objfile
;
672 struct elf_gnu_ifunc_cache entry_local
, *entry_p
;
675 msym
= lookup_minimal_symbol_by_pc (addr
);
676 if (msym
.minsym
== NULL
)
678 if (BMSYMBOL_VALUE_ADDRESS (msym
) != addr
)
680 /* minimal symbols have always SYMBOL_OBJ_SECTION non-NULL. */
681 sect
= MSYMBOL_OBJ_SECTION (msym
.objfile
, msym
.minsym
)->the_bfd_section
;
682 objfile
= msym
.objfile
;
684 /* If .plt jumps back to .plt the symbol is still deferred for later
685 resolution and it has no use for GDB. Besides ".text" this symbol can
686 reside also in ".opd" for ppc64 function descriptor. */
687 if (strcmp (bfd_get_section_name (objfile
->obfd
, sect
), ".plt") == 0)
690 htab
= objfile_data (objfile
, elf_objfile_gnu_ifunc_cache_data
);
693 htab
= htab_create_alloc_ex (1, elf_gnu_ifunc_cache_hash
,
694 elf_gnu_ifunc_cache_eq
,
695 NULL
, &objfile
->objfile_obstack
,
696 hashtab_obstack_allocate
,
697 dummy_obstack_deallocate
);
698 set_objfile_data (objfile
, elf_objfile_gnu_ifunc_cache_data
, htab
);
701 entry_local
.addr
= addr
;
702 obstack_grow (&objfile
->objfile_obstack
, &entry_local
,
703 offsetof (struct elf_gnu_ifunc_cache
, name
));
704 obstack_grow_str0 (&objfile
->objfile_obstack
, name
);
706 = (struct elf_gnu_ifunc_cache
*) obstack_finish (&objfile
->objfile_obstack
);
708 slot
= htab_find_slot (htab
, entry_p
, INSERT
);
711 struct elf_gnu_ifunc_cache
*entry_found_p
= *slot
;
712 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
714 if (entry_found_p
->addr
!= addr
)
716 /* This case indicates buggy inferior program, the resolved address
717 should never change. */
719 warning (_("gnu-indirect-function \"%s\" has changed its resolved "
720 "function_address from %s to %s"),
721 name
, paddress (gdbarch
, entry_found_p
->addr
),
722 paddress (gdbarch
, addr
));
725 /* New ENTRY_P is here leaked/duplicate in the OBJFILE obstack. */
732 /* Try to find the target resolved function entry address of a STT_GNU_IFUNC
733 function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P
734 is not NULL) and the function returns 1. It returns 0 otherwise.
736 Only the elf_objfile_gnu_ifunc_cache_data hash table is searched by this
740 elf_gnu_ifunc_resolve_by_cache (const char *name
, CORE_ADDR
*addr_p
)
742 struct objfile
*objfile
;
744 ALL_PSPACE_OBJFILES (current_program_space
, objfile
)
747 struct elf_gnu_ifunc_cache
*entry_p
;
750 htab
= objfile_data (objfile
, elf_objfile_gnu_ifunc_cache_data
);
754 entry_p
= ((struct elf_gnu_ifunc_cache
*)
755 alloca (sizeof (*entry_p
) + strlen (name
)));
756 strcpy (entry_p
->name
, name
);
758 slot
= htab_find_slot (htab
, entry_p
, NO_INSERT
);
762 gdb_assert (entry_p
!= NULL
);
765 *addr_p
= entry_p
->addr
;
772 /* Try to find the target resolved function entry address of a STT_GNU_IFUNC
773 function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P
774 is not NULL) and the function returns 1. It returns 0 otherwise.
776 Only the SYMBOL_GOT_PLT_SUFFIX locations are searched by this function.
777 elf_gnu_ifunc_resolve_by_cache must have been already called for NAME to
778 prevent cache entries duplicates. */
781 elf_gnu_ifunc_resolve_by_got (const char *name
, CORE_ADDR
*addr_p
)
784 struct objfile
*objfile
;
785 const size_t got_suffix_len
= strlen (SYMBOL_GOT_PLT_SUFFIX
);
787 name_got_plt
= (char *) alloca (strlen (name
) + got_suffix_len
+ 1);
788 sprintf (name_got_plt
, "%s" SYMBOL_GOT_PLT_SUFFIX
, name
);
790 ALL_PSPACE_OBJFILES (current_program_space
, objfile
)
792 bfd
*obfd
= objfile
->obfd
;
793 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
794 struct type
*ptr_type
= builtin_type (gdbarch
)->builtin_data_ptr
;
795 size_t ptr_size
= TYPE_LENGTH (ptr_type
);
796 CORE_ADDR pointer_address
, addr
;
798 gdb_byte
*buf
= (gdb_byte
*) alloca (ptr_size
);
799 struct bound_minimal_symbol msym
;
801 msym
= lookup_minimal_symbol (name_got_plt
, NULL
, objfile
);
802 if (msym
.minsym
== NULL
)
804 if (MSYMBOL_TYPE (msym
.minsym
) != mst_slot_got_plt
)
806 pointer_address
= BMSYMBOL_VALUE_ADDRESS (msym
);
808 plt
= bfd_get_section_by_name (obfd
, ".plt");
812 if (MSYMBOL_SIZE (msym
.minsym
) != ptr_size
)
814 if (target_read_memory (pointer_address
, buf
, ptr_size
) != 0)
816 addr
= extract_typed_address (buf
, ptr_type
);
817 addr
= gdbarch_convert_from_func_ptr_addr (gdbarch
, addr
,
819 addr
= gdbarch_addr_bits_remove (gdbarch
, addr
);
823 if (elf_gnu_ifunc_record_cache (name
, addr
))
830 /* Try to find the target resolved function entry address of a STT_GNU_IFUNC
831 function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P
832 is not NULL) and the function returns 1. It returns 0 otherwise.
834 Both the elf_objfile_gnu_ifunc_cache_data hash table and
835 SYMBOL_GOT_PLT_SUFFIX locations are searched by this function. */
838 elf_gnu_ifunc_resolve_name (const char *name
, CORE_ADDR
*addr_p
)
840 if (elf_gnu_ifunc_resolve_by_cache (name
, addr_p
))
843 if (elf_gnu_ifunc_resolve_by_got (name
, addr_p
))
849 /* Call STT_GNU_IFUNC - a function returning addresss of a real function to
850 call. PC is theSTT_GNU_IFUNC resolving function entry. The value returned
851 is the entry point of the resolved STT_GNU_IFUNC target function to call.
855 elf_gnu_ifunc_resolve_addr (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
857 const char *name_at_pc
;
858 CORE_ADDR start_at_pc
, address
;
859 struct type
*func_func_type
= builtin_type (gdbarch
)->builtin_func_func
;
860 struct value
*function
, *address_val
;
862 /* Try first any non-intrusive methods without an inferior call. */
864 if (find_pc_partial_function (pc
, &name_at_pc
, &start_at_pc
, NULL
)
865 && start_at_pc
== pc
)
867 if (elf_gnu_ifunc_resolve_name (name_at_pc
, &address
))
873 function
= allocate_value (func_func_type
);
874 set_value_address (function
, pc
);
876 /* STT_GNU_IFUNC resolver functions have no parameters. FUNCTION is the
877 function entry address. ADDRESS may be a function descriptor. */
879 address_val
= call_function_by_hand (function
, 0, NULL
);
880 address
= value_as_address (address_val
);
881 address
= gdbarch_convert_from_func_ptr_addr (gdbarch
, address
,
883 address
= gdbarch_addr_bits_remove (gdbarch
, address
);
886 elf_gnu_ifunc_record_cache (name_at_pc
, address
);
891 /* Handle inferior hit of bp_gnu_ifunc_resolver, see its definition. */
894 elf_gnu_ifunc_resolver_stop (struct breakpoint
*b
)
896 struct breakpoint
*b_return
;
897 struct frame_info
*prev_frame
= get_prev_frame (get_current_frame ());
898 struct frame_id prev_frame_id
= get_stack_frame_id (prev_frame
);
899 CORE_ADDR prev_pc
= get_frame_pc (prev_frame
);
900 int thread_id
= pid_to_thread_id (inferior_ptid
);
902 gdb_assert (b
->type
== bp_gnu_ifunc_resolver
);
904 for (b_return
= b
->related_breakpoint
; b_return
!= b
;
905 b_return
= b_return
->related_breakpoint
)
907 gdb_assert (b_return
->type
== bp_gnu_ifunc_resolver_return
);
908 gdb_assert (b_return
->loc
!= NULL
&& b_return
->loc
->next
== NULL
);
909 gdb_assert (frame_id_p (b_return
->frame_id
));
911 if (b_return
->thread
== thread_id
912 && b_return
->loc
->requested_address
== prev_pc
913 && frame_id_eq (b_return
->frame_id
, prev_frame_id
))
919 struct symtab_and_line sal
;
921 /* No need to call find_pc_line for symbols resolving as this is only
922 a helper breakpointer never shown to the user. */
925 sal
.pspace
= current_inferior ()->pspace
;
927 sal
.section
= find_pc_overlay (sal
.pc
);
929 b_return
= set_momentary_breakpoint (get_frame_arch (prev_frame
), sal
,
931 bp_gnu_ifunc_resolver_return
);
933 /* set_momentary_breakpoint invalidates PREV_FRAME. */
936 /* Add new b_return to the ring list b->related_breakpoint. */
937 gdb_assert (b_return
->related_breakpoint
== b_return
);
938 b_return
->related_breakpoint
= b
->related_breakpoint
;
939 b
->related_breakpoint
= b_return
;
943 /* Handle inferior hit of bp_gnu_ifunc_resolver_return, see its definition. */
946 elf_gnu_ifunc_resolver_return_stop (struct breakpoint
*b
)
948 struct gdbarch
*gdbarch
= get_frame_arch (get_current_frame ());
949 struct type
*func_func_type
= builtin_type (gdbarch
)->builtin_func_func
;
950 struct type
*value_type
= TYPE_TARGET_TYPE (func_func_type
);
951 struct regcache
*regcache
= get_thread_regcache (inferior_ptid
);
952 struct value
*func_func
;
954 CORE_ADDR resolved_address
, resolved_pc
;
955 struct symtab_and_line sal
;
956 struct symtabs_and_lines sals
, sals_end
;
958 gdb_assert (b
->type
== bp_gnu_ifunc_resolver_return
);
960 while (b
->related_breakpoint
!= b
)
962 struct breakpoint
*b_next
= b
->related_breakpoint
;
966 case bp_gnu_ifunc_resolver
:
968 case bp_gnu_ifunc_resolver_return
:
969 delete_breakpoint (b
);
972 internal_error (__FILE__
, __LINE__
,
973 _("handle_inferior_event: Invalid "
974 "gnu-indirect-function breakpoint type %d"),
979 gdb_assert (b
->type
== bp_gnu_ifunc_resolver
);
980 gdb_assert (b
->loc
->next
== NULL
);
982 func_func
= allocate_value (func_func_type
);
983 set_value_address (func_func
, b
->loc
->related_address
);
985 value
= allocate_value (value_type
);
986 gdbarch_return_value (gdbarch
, func_func
, value_type
, regcache
,
987 value_contents_raw (value
), NULL
);
988 resolved_address
= value_as_address (value
);
989 resolved_pc
= gdbarch_convert_from_func_ptr_addr (gdbarch
,
992 resolved_pc
= gdbarch_addr_bits_remove (gdbarch
, resolved_pc
);
994 gdb_assert (current_program_space
== b
->pspace
|| b
->pspace
== NULL
);
995 elf_gnu_ifunc_record_cache (event_location_to_string (b
->location
),
998 sal
= find_pc_line (resolved_pc
, 0);
1003 b
->type
= bp_breakpoint
;
1004 update_breakpoint_locations (b
, sals
, sals_end
);
1007 /* A helper function for elf_symfile_read that reads the minimal
1011 elf_read_minimal_symbols (struct objfile
*objfile
, int symfile_flags
,
1012 const struct elfinfo
*ei
)
1014 bfd
*synth_abfd
, *abfd
= objfile
->obfd
;
1015 struct cleanup
*back_to
;
1016 long symcount
= 0, dynsymcount
= 0, synthcount
, storage_needed
;
1017 asymbol
**symbol_table
= NULL
, **dyn_symbol_table
= NULL
;
1019 struct dbx_symfile_info
*dbx
;
1021 if (symtab_create_debug
)
1023 fprintf_unfiltered (gdb_stdlog
,
1024 "Reading minimal symbols of objfile %s ...\n",
1025 objfile_name (objfile
));
1028 /* If we already have minsyms, then we can skip some work here.
1029 However, if there were stabs or mdebug sections, we go ahead and
1030 redo all the work anyway, because the psym readers for those
1031 kinds of debuginfo need extra information found here. This can
1032 go away once all types of symbols are in the per-BFD object. */
1033 if (objfile
->per_bfd
->minsyms_read
1034 && ei
->stabsect
== NULL
1035 && ei
->mdebugsect
== NULL
)
1037 if (symtab_create_debug
)
1038 fprintf_unfiltered (gdb_stdlog
,
1039 "... minimal symbols previously read\n");
1043 init_minimal_symbol_collection ();
1044 back_to
= make_cleanup_discard_minimal_symbols ();
1046 /* Allocate struct to keep track of the symfile. */
1047 dbx
= XCNEW (struct dbx_symfile_info
);
1048 set_objfile_data (objfile
, dbx_objfile_data_key
, dbx
);
1050 /* Process the normal ELF symbol table first. */
1052 storage_needed
= bfd_get_symtab_upper_bound (objfile
->obfd
);
1053 if (storage_needed
< 0)
1054 error (_("Can't read symbols from %s: %s"),
1055 bfd_get_filename (objfile
->obfd
),
1056 bfd_errmsg (bfd_get_error ()));
1058 if (storage_needed
> 0)
1060 /* Memory gets permanently referenced from ABFD after
1061 bfd_canonicalize_symtab so it must not get freed before ABFD gets. */
1063 symbol_table
= (asymbol
**) bfd_alloc (abfd
, storage_needed
);
1064 symcount
= bfd_canonicalize_symtab (objfile
->obfd
, symbol_table
);
1067 error (_("Can't read symbols from %s: %s"),
1068 bfd_get_filename (objfile
->obfd
),
1069 bfd_errmsg (bfd_get_error ()));
1071 elf_symtab_read (objfile
, ST_REGULAR
, symcount
, symbol_table
, 0);
1074 /* Add the dynamic symbols. */
1076 storage_needed
= bfd_get_dynamic_symtab_upper_bound (objfile
->obfd
);
1078 if (storage_needed
> 0)
1080 /* Memory gets permanently referenced from ABFD after
1081 bfd_get_synthetic_symtab so it must not get freed before ABFD gets.
1082 It happens only in the case when elf_slurp_reloc_table sees
1083 asection->relocation NULL. Determining which section is asection is
1084 done by _bfd_elf_get_synthetic_symtab which is all a bfd
1085 implementation detail, though. */
1087 dyn_symbol_table
= (asymbol
**) bfd_alloc (abfd
, storage_needed
);
1088 dynsymcount
= bfd_canonicalize_dynamic_symtab (objfile
->obfd
,
1091 if (dynsymcount
< 0)
1092 error (_("Can't read symbols from %s: %s"),
1093 bfd_get_filename (objfile
->obfd
),
1094 bfd_errmsg (bfd_get_error ()));
1096 elf_symtab_read (objfile
, ST_DYNAMIC
, dynsymcount
, dyn_symbol_table
, 0);
1098 elf_rel_plt_read (objfile
, dyn_symbol_table
);
1101 /* Contrary to binutils --strip-debug/--only-keep-debug the strip command from
1102 elfutils (eu-strip) moves even the .symtab section into the .debug file.
1104 bfd_get_synthetic_symtab on ppc64 for each function descriptor ELF symbol
1105 'name' creates a new BSF_SYNTHETIC ELF symbol '.name' with its code
1106 address. But with eu-strip files bfd_get_synthetic_symtab would fail to
1107 read the code address from .opd while it reads the .symtab section from
1108 a separate debug info file as the .opd section is SHT_NOBITS there.
1110 With SYNTH_ABFD the .opd section will be read from the original
1111 backlinked binary where it is valid. */
1113 if (objfile
->separate_debug_objfile_backlink
)
1114 synth_abfd
= objfile
->separate_debug_objfile_backlink
->obfd
;
1118 /* Add synthetic symbols - for instance, names for any PLT entries. */
1120 synthcount
= bfd_get_synthetic_symtab (synth_abfd
, symcount
, symbol_table
,
1121 dynsymcount
, dyn_symbol_table
,
1125 asymbol
**synth_symbol_table
;
1128 make_cleanup (xfree
, synthsyms
);
1129 synth_symbol_table
= XNEWVEC (asymbol
*, synthcount
);
1130 for (i
= 0; i
< synthcount
; i
++)
1131 synth_symbol_table
[i
] = synthsyms
+ i
;
1132 make_cleanup (xfree
, synth_symbol_table
);
1133 elf_symtab_read (objfile
, ST_SYNTHETIC
, synthcount
,
1134 synth_symbol_table
, 1);
1137 /* Install any minimal symbols that have been collected as the current
1138 minimal symbols for this objfile. The debug readers below this point
1139 should not generate new minimal symbols; if they do it's their
1140 responsibility to install them. "mdebug" appears to be the only one
1141 which will do this. */
1143 install_minimal_symbols (objfile
);
1144 do_cleanups (back_to
);
1146 if (symtab_create_debug
)
1147 fprintf_unfiltered (gdb_stdlog
, "Done reading minimal symbols.\n");
1150 /* Scan and build partial symbols for a symbol file.
1151 We have been initialized by a call to elf_symfile_init, which
1152 currently does nothing.
1154 This function only does the minimum work necessary for letting the
1155 user "name" things symbolically; it does not read the entire symtab.
1156 Instead, it reads the external and static symbols and puts them in partial
1157 symbol tables. When more extensive information is requested of a
1158 file, the corresponding partial symbol table is mutated into a full
1159 fledged symbol table by going back and reading the symbols
1162 We look for sections with specific names, to tell us what debug
1163 format to look for: FIXME!!!
1165 elfstab_build_psymtabs() handles STABS symbols;
1166 mdebug_build_psymtabs() handles ECOFF debugging information.
1168 Note that ELF files have a "minimal" symbol table, which looks a lot
1169 like a COFF symbol table, but has only the minimal information necessary
1170 for linking. We process this also, and use the information to
1171 build gdb's minimal symbol table. This gives us some minimal debugging
1172 capability even for files compiled without -g. */
1175 elf_symfile_read (struct objfile
*objfile
, int symfile_flags
)
1177 bfd
*abfd
= objfile
->obfd
;
1180 memset ((char *) &ei
, 0, sizeof (ei
));
1181 bfd_map_over_sections (abfd
, elf_locate_sections
, (void *) & ei
);
1183 elf_read_minimal_symbols (objfile
, symfile_flags
, &ei
);
1185 /* ELF debugging information is inserted into the psymtab in the
1186 order of least informative first - most informative last. Since
1187 the psymtab table is searched `most recent insertion first' this
1188 increases the probability that more detailed debug information
1189 for a section is found.
1191 For instance, an object file might contain both .mdebug (XCOFF)
1192 and .debug_info (DWARF2) sections then .mdebug is inserted first
1193 (searched last) and DWARF2 is inserted last (searched first). If
1194 we don't do this then the XCOFF info is found first - for code in
1195 an included file XCOFF info is useless. */
1199 const struct ecoff_debug_swap
*swap
;
1201 /* .mdebug section, presumably holding ECOFF debugging
1203 swap
= get_elf_backend_data (abfd
)->elf_backend_ecoff_debug_swap
;
1205 elfmdebug_build_psymtabs (objfile
, swap
, ei
.mdebugsect
);
1211 /* Stab sections have an associated string table that looks like
1212 a separate section. */
1213 str_sect
= bfd_get_section_by_name (abfd
, ".stabstr");
1215 /* FIXME should probably warn about a stab section without a stabstr. */
1217 elfstab_build_psymtabs (objfile
,
1220 bfd_section_size (abfd
, str_sect
));
1223 if (dwarf2_has_info (objfile
, NULL
))
1225 /* elf_sym_fns_gdb_index cannot handle simultaneous non-DWARF debug
1226 information present in OBJFILE. If there is such debug info present
1227 never use .gdb_index. */
1229 if (!objfile_has_partial_symbols (objfile
)
1230 && dwarf2_initialize_objfile (objfile
))
1231 objfile_set_sym_fns (objfile
, &elf_sym_fns_gdb_index
);
1234 /* It is ok to do this even if the stabs reader made some
1235 partial symbols, because OBJF_PSYMTABS_READ has not been
1236 set, and so our lazy reader function will still be called
1238 objfile_set_sym_fns (objfile
, &elf_sym_fns_lazy_psyms
);
1241 /* If the file has its own symbol tables it has no separate debug
1242 info. `.dynsym'/`.symtab' go to MSYMBOLS, `.debug_info' goes to
1243 SYMTABS/PSYMTABS. `.gnu_debuglink' may no longer be present with
1244 `.note.gnu.build-id'.
1246 .gnu_debugdata is !objfile_has_partial_symbols because it contains only
1247 .symtab, not .debug_* section. But if we already added .gnu_debugdata as
1248 an objfile via find_separate_debug_file_in_section there was no separate
1249 debug info available. Therefore do not attempt to search for another one,
1250 objfile->separate_debug_objfile->separate_debug_objfile GDB guarantees to
1251 be NULL and we would possibly violate it. */
1253 else if (!objfile_has_partial_symbols (objfile
)
1254 && objfile
->separate_debug_objfile
== NULL
1255 && objfile
->separate_debug_objfile_backlink
== NULL
)
1259 debugfile
= find_separate_debug_file_by_buildid (objfile
);
1261 if (debugfile
== NULL
)
1262 debugfile
= find_separate_debug_file_by_debuglink (objfile
);
1266 struct cleanup
*cleanup
= make_cleanup (xfree
, debugfile
);
1267 bfd
*abfd
= symfile_bfd_open (debugfile
);
1269 make_cleanup_bfd_unref (abfd
);
1270 symbol_file_add_separate (abfd
, debugfile
, symfile_flags
, objfile
);
1271 do_cleanups (cleanup
);
1276 /* Callback to lazily read psymtabs. */
1279 read_psyms (struct objfile
*objfile
)
1281 if (dwarf2_has_info (objfile
, NULL
))
1282 dwarf2_build_psymtabs (objfile
);
1285 /* Initialize anything that needs initializing when a completely new symbol
1286 file is specified (not just adding some symbols from another file, e.g. a
1289 We reinitialize buildsym, since we may be reading stabs from an ELF
1293 elf_new_init (struct objfile
*ignore
)
1295 stabsread_new_init ();
1296 buildsym_new_init ();
1299 /* Perform any local cleanups required when we are done with a particular
1300 objfile. I.E, we are in the process of discarding all symbol information
1301 for an objfile, freeing up all memory held for it, and unlinking the
1302 objfile struct from the global list of known objfiles. */
1305 elf_symfile_finish (struct objfile
*objfile
)
1307 dwarf2_free_objfile (objfile
);
1310 /* ELF specific initialization routine for reading symbols. */
1313 elf_symfile_init (struct objfile
*objfile
)
1315 /* ELF objects may be reordered, so set OBJF_REORDERED. If we
1316 find this causes a significant slowdown in gdb then we could
1317 set it in the debug symbol readers only when necessary. */
1318 objfile
->flags
|= OBJF_REORDERED
;
1321 /* Implementation of `sym_get_probes', as documented in symfile.h. */
1323 static VEC (probe_p
) *
1324 elf_get_probes (struct objfile
*objfile
)
1326 VEC (probe_p
) *probes_per_bfd
;
1328 /* Have we parsed this objfile's probes already? */
1329 probes_per_bfd
= bfd_data (objfile
->obfd
, probe_key
);
1331 if (!probes_per_bfd
)
1334 const struct probe_ops
*probe_ops
;
1336 /* Here we try to gather information about all types of probes from the
1338 for (ix
= 0; VEC_iterate (probe_ops_cp
, all_probe_ops
, ix
, probe_ops
);
1340 probe_ops
->get_probes (&probes_per_bfd
, objfile
);
1342 if (probes_per_bfd
== NULL
)
1344 VEC_reserve (probe_p
, probes_per_bfd
, 1);
1345 gdb_assert (probes_per_bfd
!= NULL
);
1348 set_bfd_data (objfile
->obfd
, probe_key
, probes_per_bfd
);
1351 return probes_per_bfd
;
1354 /* Helper function used to free the space allocated for storing SystemTap
1355 probe information. */
1358 probe_key_free (bfd
*abfd
, void *d
)
1361 VEC (probe_p
) *probes
= d
;
1362 struct probe
*probe
;
1364 for (ix
= 0; VEC_iterate (probe_p
, probes
, ix
, probe
); ix
++)
1365 probe
->pops
->destroy (probe
);
1367 VEC_free (probe_p
, probes
);
1372 /* Implementation `sym_probe_fns', as documented in symfile.h. */
1374 static const struct sym_probe_fns elf_probe_fns
=
1376 elf_get_probes
, /* sym_get_probes */
1379 /* Register that we are able to handle ELF object file formats. */
1381 static const struct sym_fns elf_sym_fns
=
1383 elf_new_init
, /* init anything gbl to entire symtab */
1384 elf_symfile_init
, /* read initial info, setup for sym_read() */
1385 elf_symfile_read
, /* read a symbol file into symtab */
1386 NULL
, /* sym_read_psymbols */
1387 elf_symfile_finish
, /* finished with file, cleanup */
1388 default_symfile_offsets
, /* Translate ext. to int. relocation */
1389 elf_symfile_segments
, /* Get segment information from a file. */
1391 default_symfile_relocate
, /* Relocate a debug section. */
1392 &elf_probe_fns
, /* sym_probe_fns */
1396 /* The same as elf_sym_fns, but not registered and lazily reads
1399 const struct sym_fns elf_sym_fns_lazy_psyms
=
1401 elf_new_init
, /* init anything gbl to entire symtab */
1402 elf_symfile_init
, /* read initial info, setup for sym_read() */
1403 elf_symfile_read
, /* read a symbol file into symtab */
1404 read_psyms
, /* sym_read_psymbols */
1405 elf_symfile_finish
, /* finished with file, cleanup */
1406 default_symfile_offsets
, /* Translate ext. to int. relocation */
1407 elf_symfile_segments
, /* Get segment information from a file. */
1409 default_symfile_relocate
, /* Relocate a debug section. */
1410 &elf_probe_fns
, /* sym_probe_fns */
1414 /* The same as elf_sym_fns, but not registered and uses the
1415 DWARF-specific GNU index rather than psymtab. */
1416 const struct sym_fns elf_sym_fns_gdb_index
=
1418 elf_new_init
, /* init anything gbl to entire symab */
1419 elf_symfile_init
, /* read initial info, setup for sym_red() */
1420 elf_symfile_read
, /* read a symbol file into symtab */
1421 NULL
, /* sym_read_psymbols */
1422 elf_symfile_finish
, /* finished with file, cleanup */
1423 default_symfile_offsets
, /* Translate ext. to int. relocatin */
1424 elf_symfile_segments
, /* Get segment information from a file. */
1426 default_symfile_relocate
, /* Relocate a debug section. */
1427 &elf_probe_fns
, /* sym_probe_fns */
1428 &dwarf2_gdb_index_functions
1431 /* STT_GNU_IFUNC resolver vector to be installed to gnu_ifunc_fns_p. */
1433 static const struct gnu_ifunc_fns elf_gnu_ifunc_fns
=
1435 elf_gnu_ifunc_resolve_addr
,
1436 elf_gnu_ifunc_resolve_name
,
1437 elf_gnu_ifunc_resolver_stop
,
1438 elf_gnu_ifunc_resolver_return_stop
1442 _initialize_elfread (void)
1444 probe_key
= register_bfd_data_with_cleanup (NULL
, probe_key_free
);
1445 add_symtab_fns (bfd_target_elf_flavour
, &elf_sym_fns
);
1447 elf_objfile_gnu_ifunc_cache_data
= register_objfile_data ();
1448 gnu_ifunc_fns_p
= &elf_gnu_ifunc_fns
;