1 /* Read ELF (Executable and Linking Format) object files for GDB.
3 Copyright (C) 1991-2017 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"
51 /* Forward declarations. */
52 extern const struct sym_fns elf_sym_fns_gdb_index
;
53 extern const struct sym_fns elf_sym_fns_lazy_psyms
;
55 /* The struct elfinfo is available only during ELF symbol table and
56 psymtab reading. It is destroyed at the completion of psymtab-reading.
57 It's local to elf_symfile_read. */
61 asection
*stabsect
; /* Section pointer for .stab section */
62 asection
*mdebugsect
; /* Section pointer for .mdebug section */
65 /* Per-BFD data for probe info. */
67 static const struct bfd_data
*probe_key
= NULL
;
69 /* Minimal symbols located at the GOT entries for .plt - that is the real
70 pointer where the given entry will jump to. It gets updated by the real
71 function address during lazy ld.so resolving in the inferior. These
72 minimal symbols are indexed for <tab>-completion. */
74 #define SYMBOL_GOT_PLT_SUFFIX "@got.plt"
76 /* Locate the segments in ABFD. */
78 static struct symfile_segment_data
*
79 elf_symfile_segments (bfd
*abfd
)
81 Elf_Internal_Phdr
*phdrs
, **segments
;
83 int num_phdrs
, num_segments
, num_sections
, i
;
85 struct symfile_segment_data
*data
;
87 phdrs_size
= bfd_get_elf_phdr_upper_bound (abfd
);
91 phdrs
= (Elf_Internal_Phdr
*) alloca (phdrs_size
);
92 num_phdrs
= bfd_get_elf_phdrs (abfd
, phdrs
);
97 segments
= XALLOCAVEC (Elf_Internal_Phdr
*, num_phdrs
);
98 for (i
= 0; i
< num_phdrs
; i
++)
99 if (phdrs
[i
].p_type
== PT_LOAD
)
100 segments
[num_segments
++] = &phdrs
[i
];
102 if (num_segments
== 0)
105 data
= XCNEW (struct symfile_segment_data
);
106 data
->num_segments
= num_segments
;
107 data
->segment_bases
= XCNEWVEC (CORE_ADDR
, num_segments
);
108 data
->segment_sizes
= XCNEWVEC (CORE_ADDR
, num_segments
);
110 for (i
= 0; i
< num_segments
; i
++)
112 data
->segment_bases
[i
] = segments
[i
]->p_vaddr
;
113 data
->segment_sizes
[i
] = segments
[i
]->p_memsz
;
116 num_sections
= bfd_count_sections (abfd
);
117 data
->segment_info
= XCNEWVEC (int, num_sections
);
119 for (i
= 0, sect
= abfd
->sections
; sect
!= NULL
; i
++, sect
= sect
->next
)
124 if ((bfd_get_section_flags (abfd
, sect
) & SEC_ALLOC
) == 0)
127 vma
= bfd_get_section_vma (abfd
, sect
);
129 for (j
= 0; j
< num_segments
; j
++)
130 if (segments
[j
]->p_memsz
> 0
131 && vma
>= segments
[j
]->p_vaddr
132 && (vma
- segments
[j
]->p_vaddr
) < segments
[j
]->p_memsz
)
134 data
->segment_info
[i
] = j
+ 1;
138 /* We should have found a segment for every non-empty section.
139 If we haven't, we will not relocate this section by any
140 offsets we apply to the segments. As an exception, do not
141 warn about SHT_NOBITS sections; in normal ELF execution
142 environments, SHT_NOBITS means zero-initialized and belongs
143 in a segment, but in no-OS environments some tools (e.g. ARM
144 RealView) use SHT_NOBITS for uninitialized data. Since it is
145 uninitialized, it doesn't need a program header. Such
146 binaries are not relocatable. */
147 if (bfd_get_section_size (sect
) > 0 && j
== num_segments
148 && (bfd_get_section_flags (abfd
, sect
) & SEC_LOAD
) != 0)
149 warning (_("Loadable section \"%s\" outside of ELF segments"),
150 bfd_section_name (abfd
, sect
));
156 /* We are called once per section from elf_symfile_read. We
157 need to examine each section we are passed, check to see
158 if it is something we are interested in processing, and
159 if so, stash away some access information for the section.
161 For now we recognize the dwarf debug information sections and
162 line number sections from matching their section names. The
163 ELF definition is no real help here since it has no direct
164 knowledge of DWARF (by design, so any debugging format can be
167 We also recognize the ".stab" sections used by the Sun compilers
168 released with Solaris 2.
170 FIXME: The section names should not be hardwired strings (what
171 should they be? I don't think most object file formats have enough
172 section flags to specify what kind of debug section it is.
176 elf_locate_sections (bfd
*ignore_abfd
, asection
*sectp
, void *eip
)
180 ei
= (struct elfinfo
*) eip
;
181 if (strcmp (sectp
->name
, ".stab") == 0)
183 ei
->stabsect
= sectp
;
185 else if (strcmp (sectp
->name
, ".mdebug") == 0)
187 ei
->mdebugsect
= sectp
;
191 static struct minimal_symbol
*
192 record_minimal_symbol (minimal_symbol_reader
&reader
,
193 const char *name
, int name_len
, bool 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 reader
.record_full (name
, name_len
, copy_name
, address
,
206 gdb_bfd_section_index (objfile
->obfd
,
210 /* Read the symbol table of an ELF file.
212 Given an objfile, a symbol table, and a flag indicating whether the
213 symbol table contains regular, dynamic, or synthetic symbols, add all
214 the global function and data symbols to the minimal symbol table.
216 In stabs-in-ELF, as implemented by Sun, there are some local symbols
217 defined in the ELF symbol table, which can be used to locate
218 the beginnings of sections from each ".o" file that was linked to
219 form the executable objfile. We gather any such info and record it
220 in data structures hung off the objfile's private data. */
224 #define ST_SYNTHETIC 2
227 elf_symtab_read (minimal_symbol_reader
&reader
,
228 struct objfile
*objfile
, int type
,
229 long number_of_symbols
, asymbol
**symbol_table
,
232 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
236 enum minimal_symbol_type ms_type
;
237 /* Name of the last file symbol. This is either a constant string or is
238 saved on the objfile's filename cache. */
239 const char *filesymname
= "";
240 struct dbx_symfile_info
*dbx
= DBX_SYMFILE_INFO (objfile
);
241 int stripped
= (bfd_get_symcount (objfile
->obfd
) == 0);
242 int elf_make_msymbol_special_p
243 = gdbarch_elf_make_msymbol_special_p (gdbarch
);
245 for (i
= 0; i
< number_of_symbols
; i
++)
247 sym
= symbol_table
[i
];
248 if (sym
->name
== NULL
|| *sym
->name
== '\0')
250 /* Skip names that don't exist (shouldn't happen), or names
251 that are null strings (may happen). */
255 /* Skip "special" symbols, e.g. ARM mapping symbols. These are
256 symbols which do not correspond to objects in the symbol table,
257 but have some other target-specific meaning. */
258 if (bfd_is_target_special_symbol (objfile
->obfd
, sym
))
260 if (gdbarch_record_special_symbol_p (gdbarch
))
261 gdbarch_record_special_symbol (gdbarch
, objfile
, sym
);
265 if (type
== ST_DYNAMIC
266 && sym
->section
== bfd_und_section_ptr
267 && (sym
->flags
& BSF_FUNCTION
))
269 struct minimal_symbol
*msym
;
270 bfd
*abfd
= objfile
->obfd
;
273 /* Symbol is a reference to a function defined in
275 If its value is non zero then it is usually the address
276 of the corresponding entry in the procedure linkage table,
277 plus the desired section offset.
278 If its value is zero then the dynamic linker has to resolve
279 the symbol. We are unable to find any meaningful address
280 for this symbol in the executable file, so we skip it. */
281 symaddr
= sym
->value
;
285 /* sym->section is the undefined section. However, we want to
286 record the section where the PLT stub resides with the
287 minimal symbol. Search the section table for the one that
288 covers the stub's address. */
289 for (sect
= abfd
->sections
; sect
!= NULL
; sect
= sect
->next
)
291 if ((bfd_get_section_flags (abfd
, sect
) & SEC_ALLOC
) == 0)
294 if (symaddr
>= bfd_get_section_vma (abfd
, sect
)
295 && symaddr
< bfd_get_section_vma (abfd
, sect
)
296 + bfd_get_section_size (sect
))
302 /* On ia64-hpux, we have discovered that the system linker
303 adds undefined symbols with nonzero addresses that cannot
304 be right (their address points inside the code of another
305 function in the .text section). This creates problems
306 when trying to determine which symbol corresponds to
309 We try to detect those buggy symbols by checking which
310 section we think they correspond to. Normally, PLT symbols
311 are stored inside their own section, and the typical name
312 for that section is ".plt". So, if there is a ".plt"
313 section, and yet the section name of our symbol does not
314 start with ".plt", we ignore that symbol. */
315 if (!startswith (sect
->name
, ".plt")
316 && bfd_get_section_by_name (abfd
, ".plt") != NULL
)
319 msym
= record_minimal_symbol
320 (reader
, sym
->name
, strlen (sym
->name
), copy_names
,
321 symaddr
, mst_solib_trampoline
, sect
, objfile
);
324 msym
->filename
= filesymname
;
325 if (elf_make_msymbol_special_p
)
326 gdbarch_elf_make_msymbol_special (gdbarch
, sym
, msym
);
331 /* If it is a nonstripped executable, do not enter dynamic
332 symbols, as the dynamic symbol table is usually a subset
333 of the main symbol table. */
334 if (type
== ST_DYNAMIC
&& !stripped
)
336 if (sym
->flags
& BSF_FILE
)
339 = (const char *) bcache (sym
->name
, strlen (sym
->name
) + 1,
340 objfile
->per_bfd
->filename_cache
);
342 else if (sym
->flags
& BSF_SECTION_SYM
)
344 else if (sym
->flags
& (BSF_GLOBAL
| BSF_LOCAL
| BSF_WEAK
347 struct minimal_symbol
*msym
;
349 /* Select global/local/weak symbols. Note that bfd puts abs
350 symbols in their own section, so all symbols we are
351 interested in will have a section. */
352 /* Bfd symbols are section relative. */
353 symaddr
= sym
->value
+ sym
->section
->vma
;
354 /* For non-absolute symbols, use the type of the section
355 they are relative to, to intuit text/data. Bfd provides
356 no way of figuring this out for absolute symbols. */
357 if (sym
->section
== bfd_abs_section_ptr
)
359 /* This is a hack to get the minimal symbol type
360 right for Irix 5, which has absolute addresses
361 with special section indices for dynamic symbols.
363 NOTE: uweigand-20071112: Synthetic symbols do not
364 have an ELF-private part, so do not touch those. */
365 unsigned int shndx
= type
== ST_SYNTHETIC
? 0 :
366 ((elf_symbol_type
*) sym
)->internal_elf_sym
.st_shndx
;
376 case SHN_MIPS_ACOMMON
:
383 /* If it is an Irix dynamic symbol, skip section name
384 symbols, relocate all others by section offset. */
385 if (ms_type
!= mst_abs
)
387 if (sym
->name
[0] == '.')
391 else if (sym
->section
->flags
& SEC_CODE
)
393 if (sym
->flags
& (BSF_GLOBAL
| BSF_WEAK
| BSF_GNU_UNIQUE
))
395 if (sym
->flags
& BSF_GNU_INDIRECT_FUNCTION
)
396 ms_type
= mst_text_gnu_ifunc
;
400 /* The BSF_SYNTHETIC check is there to omit ppc64 function
401 descriptors mistaken for static functions starting with 'L'.
403 else if ((sym
->name
[0] == '.' && sym
->name
[1] == 'L'
404 && (sym
->flags
& BSF_SYNTHETIC
) == 0)
405 || ((sym
->flags
& BSF_LOCAL
)
406 && sym
->name
[0] == '$'
407 && sym
->name
[1] == 'L'))
408 /* Looks like a compiler-generated label. Skip
409 it. The assembler should be skipping these (to
410 keep executables small), but apparently with
411 gcc on the (deleted) delta m88k SVR4, it loses.
412 So to have us check too should be harmless (but
413 I encourage people to fix this in the assembler
414 instead of adding checks here). */
418 ms_type
= mst_file_text
;
421 else if (sym
->section
->flags
& SEC_ALLOC
)
423 if (sym
->flags
& (BSF_GLOBAL
| BSF_WEAK
| BSF_GNU_UNIQUE
))
425 if (sym
->section
->flags
& SEC_LOAD
)
434 else if (sym
->flags
& BSF_LOCAL
)
436 if (sym
->section
->flags
& SEC_LOAD
)
438 ms_type
= mst_file_data
;
442 ms_type
= mst_file_bss
;
447 ms_type
= mst_unknown
;
452 /* FIXME: Solaris2 shared libraries include lots of
453 odd "absolute" and "undefined" symbols, that play
454 hob with actions like finding what function the PC
455 is in. Ignore them if they aren't text, data, or bss. */
456 /* ms_type = mst_unknown; */
457 continue; /* Skip this symbol. */
459 msym
= record_minimal_symbol
460 (reader
, sym
->name
, strlen (sym
->name
), copy_names
, symaddr
,
461 ms_type
, sym
->section
, objfile
);
465 /* NOTE: uweigand-20071112: A synthetic symbol does not have an
467 if (type
!= ST_SYNTHETIC
)
469 /* Pass symbol size field in via BFD. FIXME!!! */
470 elf_symbol_type
*elf_sym
= (elf_symbol_type
*) sym
;
471 SET_MSYMBOL_SIZE (msym
, elf_sym
->internal_elf_sym
.st_size
);
474 msym
->filename
= filesymname
;
475 if (elf_make_msymbol_special_p
)
476 gdbarch_elf_make_msymbol_special (gdbarch
, sym
, msym
);
479 /* If we see a default versioned symbol, install it under
480 its version-less name. */
483 const char *atsign
= strchr (sym
->name
, '@');
485 if (atsign
!= NULL
&& atsign
[1] == '@' && atsign
> sym
->name
)
487 int len
= atsign
- sym
->name
;
489 record_minimal_symbol (reader
, sym
->name
, len
, true, symaddr
,
490 ms_type
, sym
->section
, objfile
);
494 /* For @plt symbols, also record a trampoline to the
495 destination symbol. The @plt symbol will be used in
496 disassembly, and the trampoline will be used when we are
497 trying to find the target. */
498 if (msym
&& ms_type
== mst_text
&& type
== ST_SYNTHETIC
)
500 int len
= strlen (sym
->name
);
502 if (len
> 4 && strcmp (sym
->name
+ len
- 4, "@plt") == 0)
504 struct minimal_symbol
*mtramp
;
506 mtramp
= record_minimal_symbol (reader
, sym
->name
, len
- 4,
508 mst_solib_trampoline
,
509 sym
->section
, objfile
);
512 SET_MSYMBOL_SIZE (mtramp
, MSYMBOL_SIZE (msym
));
513 mtramp
->created_by_gdb
= 1;
514 mtramp
->filename
= filesymname
;
515 if (elf_make_msymbol_special_p
)
516 gdbarch_elf_make_msymbol_special (gdbarch
,
525 /* Build minimal symbols named `function@got.plt' (see SYMBOL_GOT_PLT_SUFFIX)
526 for later look ups of which function to call when user requests
527 a STT_GNU_IFUNC function. As the STT_GNU_IFUNC type is found at the target
528 library defining `function' we cannot yet know while reading OBJFILE which
529 of the SYMBOL_GOT_PLT_SUFFIX entries will be needed and later
530 DYN_SYMBOL_TABLE is no longer easily available for OBJFILE. */
533 elf_rel_plt_read (minimal_symbol_reader
&reader
,
534 struct objfile
*objfile
, asymbol
**dyn_symbol_table
)
536 bfd
*obfd
= objfile
->obfd
;
537 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
538 asection
*plt
, *relplt
, *got_plt
;
540 bfd_size_type reloc_count
, reloc
;
541 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
542 struct type
*ptr_type
= builtin_type (gdbarch
)->builtin_data_ptr
;
543 size_t ptr_size
= TYPE_LENGTH (ptr_type
);
545 if (objfile
->separate_debug_objfile_backlink
)
548 plt
= bfd_get_section_by_name (obfd
, ".plt");
551 plt_elf_idx
= elf_section_data (plt
)->this_idx
;
553 got_plt
= bfd_get_section_by_name (obfd
, ".got.plt");
556 /* For platforms where there is no separate .got.plt. */
557 got_plt
= bfd_get_section_by_name (obfd
, ".got");
562 /* This search algorithm is from _bfd_elf_canonicalize_dynamic_reloc. */
563 for (relplt
= obfd
->sections
; relplt
!= NULL
; relplt
= relplt
->next
)
564 if (elf_section_data (relplt
)->this_hdr
.sh_info
== plt_elf_idx
565 && (elf_section_data (relplt
)->this_hdr
.sh_type
== SHT_REL
566 || elf_section_data (relplt
)->this_hdr
.sh_type
== SHT_RELA
))
571 if (! bed
->s
->slurp_reloc_table (obfd
, relplt
, dyn_symbol_table
, TRUE
))
574 std::string string_buffer
;
576 reloc_count
= relplt
->size
/ elf_section_data (relplt
)->this_hdr
.sh_entsize
;
577 for (reloc
= 0; reloc
< reloc_count
; reloc
++)
580 struct minimal_symbol
*msym
;
582 const char *got_suffix
= SYMBOL_GOT_PLT_SUFFIX
;
583 const size_t got_suffix_len
= strlen (SYMBOL_GOT_PLT_SUFFIX
);
585 name
= bfd_asymbol_name (*relplt
->relocation
[reloc
].sym_ptr_ptr
);
586 address
= relplt
->relocation
[reloc
].address
;
588 /* Does the pointer reside in the .got.plt section? */
589 if (!(bfd_get_section_vma (obfd
, got_plt
) <= address
590 && address
< bfd_get_section_vma (obfd
, got_plt
)
591 + bfd_get_section_size (got_plt
)))
594 /* We cannot check if NAME is a reference to mst_text_gnu_ifunc as in
595 OBJFILE the symbol is undefined and the objfile having NAME defined
596 may not yet have been loaded. */
598 string_buffer
.assign (name
);
599 string_buffer
.append (got_suffix
, got_suffix
+ got_suffix_len
);
601 msym
= record_minimal_symbol (reader
, string_buffer
.c_str (),
602 string_buffer
.size (),
603 true, address
, mst_slot_got_plt
, got_plt
,
606 SET_MSYMBOL_SIZE (msym
, ptr_size
);
610 /* The data pointer is htab_t for gnu_ifunc_record_cache_unchecked. */
612 static const struct objfile_data
*elf_objfile_gnu_ifunc_cache_data
;
614 /* Map function names to CORE_ADDR in elf_objfile_gnu_ifunc_cache_data. */
616 struct elf_gnu_ifunc_cache
618 /* This is always a function entry address, not a function descriptor. */
624 /* htab_hash for elf_objfile_gnu_ifunc_cache_data. */
627 elf_gnu_ifunc_cache_hash (const void *a_voidp
)
629 const struct elf_gnu_ifunc_cache
*a
630 = (const struct elf_gnu_ifunc_cache
*) a_voidp
;
632 return htab_hash_string (a
->name
);
635 /* htab_eq for elf_objfile_gnu_ifunc_cache_data. */
638 elf_gnu_ifunc_cache_eq (const void *a_voidp
, const void *b_voidp
)
640 const struct elf_gnu_ifunc_cache
*a
641 = (const struct elf_gnu_ifunc_cache
*) a_voidp
;
642 const struct elf_gnu_ifunc_cache
*b
643 = (const struct elf_gnu_ifunc_cache
*) b_voidp
;
645 return strcmp (a
->name
, b
->name
) == 0;
648 /* Record the target function address of a STT_GNU_IFUNC function NAME is the
649 function entry address ADDR. Return 1 if NAME and ADDR are considered as
650 valid and therefore they were successfully recorded, return 0 otherwise.
652 Function does not expect a duplicate entry. Use
653 elf_gnu_ifunc_resolve_by_cache first to check if the entry for NAME already
657 elf_gnu_ifunc_record_cache (const char *name
, CORE_ADDR addr
)
659 struct bound_minimal_symbol msym
;
661 struct objfile
*objfile
;
663 struct elf_gnu_ifunc_cache entry_local
, *entry_p
;
666 msym
= lookup_minimal_symbol_by_pc (addr
);
667 if (msym
.minsym
== NULL
)
669 if (BMSYMBOL_VALUE_ADDRESS (msym
) != addr
)
671 /* minimal symbols have always SYMBOL_OBJ_SECTION non-NULL. */
672 sect
= MSYMBOL_OBJ_SECTION (msym
.objfile
, msym
.minsym
)->the_bfd_section
;
673 objfile
= msym
.objfile
;
675 /* If .plt jumps back to .plt the symbol is still deferred for later
676 resolution and it has no use for GDB. Besides ".text" this symbol can
677 reside also in ".opd" for ppc64 function descriptor. */
678 if (strcmp (bfd_get_section_name (objfile
->obfd
, sect
), ".plt") == 0)
681 htab
= (htab_t
) objfile_data (objfile
, elf_objfile_gnu_ifunc_cache_data
);
684 htab
= htab_create_alloc_ex (1, elf_gnu_ifunc_cache_hash
,
685 elf_gnu_ifunc_cache_eq
,
686 NULL
, &objfile
->objfile_obstack
,
687 hashtab_obstack_allocate
,
688 dummy_obstack_deallocate
);
689 set_objfile_data (objfile
, elf_objfile_gnu_ifunc_cache_data
, htab
);
692 entry_local
.addr
= addr
;
693 obstack_grow (&objfile
->objfile_obstack
, &entry_local
,
694 offsetof (struct elf_gnu_ifunc_cache
, name
));
695 obstack_grow_str0 (&objfile
->objfile_obstack
, name
);
697 = (struct elf_gnu_ifunc_cache
*) obstack_finish (&objfile
->objfile_obstack
);
699 slot
= htab_find_slot (htab
, entry_p
, INSERT
);
702 struct elf_gnu_ifunc_cache
*entry_found_p
703 = (struct elf_gnu_ifunc_cache
*) *slot
;
704 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
706 if (entry_found_p
->addr
!= addr
)
708 /* This case indicates buggy inferior program, the resolved address
709 should never change. */
711 warning (_("gnu-indirect-function \"%s\" has changed its resolved "
712 "function_address from %s to %s"),
713 name
, paddress (gdbarch
, entry_found_p
->addr
),
714 paddress (gdbarch
, addr
));
717 /* New ENTRY_P is here leaked/duplicate in the OBJFILE obstack. */
724 /* Try to find the target resolved function entry address of a STT_GNU_IFUNC
725 function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P
726 is not NULL) and the function returns 1. It returns 0 otherwise.
728 Only the elf_objfile_gnu_ifunc_cache_data hash table is searched by this
732 elf_gnu_ifunc_resolve_by_cache (const char *name
, CORE_ADDR
*addr_p
)
734 struct objfile
*objfile
;
736 ALL_PSPACE_OBJFILES (current_program_space
, objfile
)
739 struct elf_gnu_ifunc_cache
*entry_p
;
742 htab
= (htab_t
) objfile_data (objfile
, elf_objfile_gnu_ifunc_cache_data
);
746 entry_p
= ((struct elf_gnu_ifunc_cache
*)
747 alloca (sizeof (*entry_p
) + strlen (name
)));
748 strcpy (entry_p
->name
, name
);
750 slot
= htab_find_slot (htab
, entry_p
, NO_INSERT
);
753 entry_p
= (struct elf_gnu_ifunc_cache
*) *slot
;
754 gdb_assert (entry_p
!= NULL
);
757 *addr_p
= entry_p
->addr
;
764 /* Try to find the target resolved function entry address of a STT_GNU_IFUNC
765 function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P
766 is not NULL) and the function returns 1. It returns 0 otherwise.
768 Only the SYMBOL_GOT_PLT_SUFFIX locations are searched by this function.
769 elf_gnu_ifunc_resolve_by_cache must have been already called for NAME to
770 prevent cache entries duplicates. */
773 elf_gnu_ifunc_resolve_by_got (const char *name
, CORE_ADDR
*addr_p
)
776 struct objfile
*objfile
;
777 const size_t got_suffix_len
= strlen (SYMBOL_GOT_PLT_SUFFIX
);
779 name_got_plt
= (char *) alloca (strlen (name
) + got_suffix_len
+ 1);
780 sprintf (name_got_plt
, "%s" SYMBOL_GOT_PLT_SUFFIX
, name
);
782 ALL_PSPACE_OBJFILES (current_program_space
, objfile
)
784 bfd
*obfd
= objfile
->obfd
;
785 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
786 struct type
*ptr_type
= builtin_type (gdbarch
)->builtin_data_ptr
;
787 size_t ptr_size
= TYPE_LENGTH (ptr_type
);
788 CORE_ADDR pointer_address
, addr
;
790 gdb_byte
*buf
= (gdb_byte
*) alloca (ptr_size
);
791 struct bound_minimal_symbol msym
;
793 msym
= lookup_minimal_symbol (name_got_plt
, NULL
, objfile
);
794 if (msym
.minsym
== NULL
)
796 if (MSYMBOL_TYPE (msym
.minsym
) != mst_slot_got_plt
)
798 pointer_address
= BMSYMBOL_VALUE_ADDRESS (msym
);
800 plt
= bfd_get_section_by_name (obfd
, ".plt");
804 if (MSYMBOL_SIZE (msym
.minsym
) != ptr_size
)
806 if (target_read_memory (pointer_address
, buf
, ptr_size
) != 0)
808 addr
= extract_typed_address (buf
, ptr_type
);
809 addr
= gdbarch_convert_from_func_ptr_addr (gdbarch
, addr
,
811 addr
= gdbarch_addr_bits_remove (gdbarch
, addr
);
815 if (elf_gnu_ifunc_record_cache (name
, addr
))
822 /* Try to find the target resolved function entry address of a STT_GNU_IFUNC
823 function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P
824 is not NULL) and the function returns 1. It returns 0 otherwise.
826 Both the elf_objfile_gnu_ifunc_cache_data hash table and
827 SYMBOL_GOT_PLT_SUFFIX locations are searched by this function. */
830 elf_gnu_ifunc_resolve_name (const char *name
, CORE_ADDR
*addr_p
)
832 if (elf_gnu_ifunc_resolve_by_cache (name
, addr_p
))
835 if (elf_gnu_ifunc_resolve_by_got (name
, addr_p
))
841 /* Call STT_GNU_IFUNC - a function returning addresss of a real function to
842 call. PC is theSTT_GNU_IFUNC resolving function entry. The value returned
843 is the entry point of the resolved STT_GNU_IFUNC target function to call.
847 elf_gnu_ifunc_resolve_addr (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
849 const char *name_at_pc
;
850 CORE_ADDR start_at_pc
, address
;
851 struct type
*func_func_type
= builtin_type (gdbarch
)->builtin_func_func
;
852 struct value
*function
, *address_val
;
854 struct value
*hwcap_val
;
856 /* Try first any non-intrusive methods without an inferior call. */
858 if (find_pc_partial_function (pc
, &name_at_pc
, &start_at_pc
, NULL
)
859 && start_at_pc
== pc
)
861 if (elf_gnu_ifunc_resolve_name (name_at_pc
, &address
))
867 function
= allocate_value (func_func_type
);
868 VALUE_LVAL (function
) = lval_memory
;
869 set_value_address (function
, pc
);
871 /* STT_GNU_IFUNC resolver functions usually receive the HWCAP vector as
872 parameter. FUNCTION is the function entry address. ADDRESS may be a
873 function descriptor. */
875 target_auxv_search (¤t_target
, AT_HWCAP
, &hwcap
);
876 hwcap_val
= value_from_longest (builtin_type (gdbarch
)
877 ->builtin_unsigned_long
, hwcap
);
878 address_val
= call_function_by_hand (function
, NULL
, 1, &hwcap_val
);
879 address
= value_as_address (address_val
);
880 address
= gdbarch_convert_from_func_ptr_addr (gdbarch
, address
,
882 address
= gdbarch_addr_bits_remove (gdbarch
, address
);
885 elf_gnu_ifunc_record_cache (name_at_pc
, address
);
890 /* Handle inferior hit of bp_gnu_ifunc_resolver, see its definition. */
893 elf_gnu_ifunc_resolver_stop (struct breakpoint
*b
)
895 struct breakpoint
*b_return
;
896 struct frame_info
*prev_frame
= get_prev_frame (get_current_frame ());
897 struct frame_id prev_frame_id
= get_stack_frame_id (prev_frame
);
898 CORE_ADDR prev_pc
= get_frame_pc (prev_frame
);
899 int thread_id
= ptid_to_global_thread_id (inferior_ptid
);
901 gdb_assert (b
->type
== bp_gnu_ifunc_resolver
);
903 for (b_return
= b
->related_breakpoint
; b_return
!= b
;
904 b_return
= b_return
->related_breakpoint
)
906 gdb_assert (b_return
->type
== bp_gnu_ifunc_resolver_return
);
907 gdb_assert (b_return
->loc
!= NULL
&& b_return
->loc
->next
== NULL
);
908 gdb_assert (frame_id_p (b_return
->frame_id
));
910 if (b_return
->thread
== thread_id
911 && b_return
->loc
->requested_address
== prev_pc
912 && frame_id_eq (b_return
->frame_id
, prev_frame_id
))
918 /* No need to call find_pc_line for symbols resolving as this is only
919 a helper breakpointer never shown to the user. */
922 sal
.pspace
= current_inferior ()->pspace
;
924 sal
.section
= find_pc_overlay (sal
.pc
);
926 b_return
= set_momentary_breakpoint (get_frame_arch (prev_frame
), sal
,
928 bp_gnu_ifunc_resolver_return
);
930 /* set_momentary_breakpoint invalidates PREV_FRAME. */
933 /* Add new b_return to the ring list b->related_breakpoint. */
934 gdb_assert (b_return
->related_breakpoint
== b_return
);
935 b_return
->related_breakpoint
= b
->related_breakpoint
;
936 b
->related_breakpoint
= b_return
;
940 /* Handle inferior hit of bp_gnu_ifunc_resolver_return, see its definition. */
943 elf_gnu_ifunc_resolver_return_stop (struct breakpoint
*b
)
945 struct gdbarch
*gdbarch
= get_frame_arch (get_current_frame ());
946 struct type
*func_func_type
= builtin_type (gdbarch
)->builtin_func_func
;
947 struct type
*value_type
= TYPE_TARGET_TYPE (func_func_type
);
948 struct regcache
*regcache
= get_thread_regcache (inferior_ptid
);
949 struct value
*func_func
;
951 CORE_ADDR resolved_address
, resolved_pc
;
953 gdb_assert (b
->type
== bp_gnu_ifunc_resolver_return
);
955 while (b
->related_breakpoint
!= b
)
957 struct breakpoint
*b_next
= b
->related_breakpoint
;
961 case bp_gnu_ifunc_resolver
:
963 case bp_gnu_ifunc_resolver_return
:
964 delete_breakpoint (b
);
967 internal_error (__FILE__
, __LINE__
,
968 _("handle_inferior_event: Invalid "
969 "gnu-indirect-function breakpoint type %d"),
974 gdb_assert (b
->type
== bp_gnu_ifunc_resolver
);
975 gdb_assert (b
->loc
->next
== NULL
);
977 func_func
= allocate_value (func_func_type
);
978 VALUE_LVAL (func_func
) = lval_memory
;
979 set_value_address (func_func
, b
->loc
->related_address
);
981 value
= allocate_value (value_type
);
982 gdbarch_return_value (gdbarch
, func_func
, value_type
, regcache
,
983 value_contents_raw (value
), NULL
);
984 resolved_address
= value_as_address (value
);
985 resolved_pc
= gdbarch_convert_from_func_ptr_addr (gdbarch
,
988 resolved_pc
= gdbarch_addr_bits_remove (gdbarch
, resolved_pc
);
990 gdb_assert (current_program_space
== b
->pspace
|| b
->pspace
== NULL
);
991 elf_gnu_ifunc_record_cache (event_location_to_string (b
->location
.get ()),
994 b
->type
= bp_breakpoint
;
995 update_breakpoint_locations (b
, current_program_space
,
996 find_pc_line (resolved_pc
, 0), {});
999 /* A helper function for elf_symfile_read that reads the minimal
1003 elf_read_minimal_symbols (struct objfile
*objfile
, int symfile_flags
,
1004 const struct elfinfo
*ei
)
1006 bfd
*synth_abfd
, *abfd
= objfile
->obfd
;
1007 long symcount
= 0, dynsymcount
= 0, synthcount
, storage_needed
;
1008 asymbol
**symbol_table
= NULL
, **dyn_symbol_table
= NULL
;
1010 struct dbx_symfile_info
*dbx
;
1012 if (symtab_create_debug
)
1014 fprintf_unfiltered (gdb_stdlog
,
1015 "Reading minimal symbols of objfile %s ...\n",
1016 objfile_name (objfile
));
1019 /* If we already have minsyms, then we can skip some work here.
1020 However, if there were stabs or mdebug sections, we go ahead and
1021 redo all the work anyway, because the psym readers for those
1022 kinds of debuginfo need extra information found here. This can
1023 go away once all types of symbols are in the per-BFD object. */
1024 if (objfile
->per_bfd
->minsyms_read
1025 && ei
->stabsect
== NULL
1026 && ei
->mdebugsect
== NULL
)
1028 if (symtab_create_debug
)
1029 fprintf_unfiltered (gdb_stdlog
,
1030 "... minimal symbols previously read\n");
1034 minimal_symbol_reader
reader (objfile
);
1036 /* Allocate struct to keep track of the symfile. */
1037 dbx
= XCNEW (struct dbx_symfile_info
);
1038 set_objfile_data (objfile
, dbx_objfile_data_key
, dbx
);
1040 /* Process the normal ELF symbol table first. */
1042 storage_needed
= bfd_get_symtab_upper_bound (objfile
->obfd
);
1043 if (storage_needed
< 0)
1044 error (_("Can't read symbols from %s: %s"),
1045 bfd_get_filename (objfile
->obfd
),
1046 bfd_errmsg (bfd_get_error ()));
1048 if (storage_needed
> 0)
1050 /* Memory gets permanently referenced from ABFD after
1051 bfd_canonicalize_symtab so it must not get freed before ABFD gets. */
1053 symbol_table
= (asymbol
**) bfd_alloc (abfd
, storage_needed
);
1054 symcount
= bfd_canonicalize_symtab (objfile
->obfd
, symbol_table
);
1057 error (_("Can't read symbols from %s: %s"),
1058 bfd_get_filename (objfile
->obfd
),
1059 bfd_errmsg (bfd_get_error ()));
1061 elf_symtab_read (reader
, objfile
, ST_REGULAR
, symcount
, symbol_table
,
1065 /* Add the dynamic symbols. */
1067 storage_needed
= bfd_get_dynamic_symtab_upper_bound (objfile
->obfd
);
1069 if (storage_needed
> 0)
1071 /* Memory gets permanently referenced from ABFD after
1072 bfd_get_synthetic_symtab so it must not get freed before ABFD gets.
1073 It happens only in the case when elf_slurp_reloc_table sees
1074 asection->relocation NULL. Determining which section is asection is
1075 done by _bfd_elf_get_synthetic_symtab which is all a bfd
1076 implementation detail, though. */
1078 dyn_symbol_table
= (asymbol
**) bfd_alloc (abfd
, storage_needed
);
1079 dynsymcount
= bfd_canonicalize_dynamic_symtab (objfile
->obfd
,
1082 if (dynsymcount
< 0)
1083 error (_("Can't read symbols from %s: %s"),
1084 bfd_get_filename (objfile
->obfd
),
1085 bfd_errmsg (bfd_get_error ()));
1087 elf_symtab_read (reader
, objfile
, ST_DYNAMIC
, dynsymcount
,
1088 dyn_symbol_table
, false);
1090 elf_rel_plt_read (reader
, objfile
, dyn_symbol_table
);
1093 /* Contrary to binutils --strip-debug/--only-keep-debug the strip command from
1094 elfutils (eu-strip) moves even the .symtab section into the .debug file.
1096 bfd_get_synthetic_symtab on ppc64 for each function descriptor ELF symbol
1097 'name' creates a new BSF_SYNTHETIC ELF symbol '.name' with its code
1098 address. But with eu-strip files bfd_get_synthetic_symtab would fail to
1099 read the code address from .opd while it reads the .symtab section from
1100 a separate debug info file as the .opd section is SHT_NOBITS there.
1102 With SYNTH_ABFD the .opd section will be read from the original
1103 backlinked binary where it is valid. */
1105 if (objfile
->separate_debug_objfile_backlink
)
1106 synth_abfd
= objfile
->separate_debug_objfile_backlink
->obfd
;
1110 /* Add synthetic symbols - for instance, names for any PLT entries. */
1112 synthcount
= bfd_get_synthetic_symtab (synth_abfd
, symcount
, symbol_table
,
1113 dynsymcount
, dyn_symbol_table
,
1119 std::unique_ptr
<asymbol
*[]>
1120 synth_symbol_table (new asymbol
*[synthcount
]);
1121 for (i
= 0; i
< synthcount
; i
++)
1122 synth_symbol_table
[i
] = synthsyms
+ i
;
1123 elf_symtab_read (reader
, objfile
, ST_SYNTHETIC
, synthcount
,
1124 synth_symbol_table
.get (), true);
1130 /* Install any minimal symbols that have been collected as the current
1131 minimal symbols for this objfile. The debug readers below this point
1132 should not generate new minimal symbols; if they do it's their
1133 responsibility to install them. "mdebug" appears to be the only one
1134 which will do this. */
1138 if (symtab_create_debug
)
1139 fprintf_unfiltered (gdb_stdlog
, "Done reading minimal symbols.\n");
1142 /* Scan and build partial symbols for a symbol file.
1143 We have been initialized by a call to elf_symfile_init, which
1144 currently does nothing.
1146 This function only does the minimum work necessary for letting the
1147 user "name" things symbolically; it does not read the entire symtab.
1148 Instead, it reads the external and static symbols and puts them in partial
1149 symbol tables. When more extensive information is requested of a
1150 file, the corresponding partial symbol table is mutated into a full
1151 fledged symbol table by going back and reading the symbols
1154 We look for sections with specific names, to tell us what debug
1155 format to look for: FIXME!!!
1157 elfstab_build_psymtabs() handles STABS symbols;
1158 mdebug_build_psymtabs() handles ECOFF debugging information.
1160 Note that ELF files have a "minimal" symbol table, which looks a lot
1161 like a COFF symbol table, but has only the minimal information necessary
1162 for linking. We process this also, and use the information to
1163 build gdb's minimal symbol table. This gives us some minimal debugging
1164 capability even for files compiled without -g. */
1167 elf_symfile_read (struct objfile
*objfile
, symfile_add_flags symfile_flags
)
1169 bfd
*abfd
= objfile
->obfd
;
1172 memset ((char *) &ei
, 0, sizeof (ei
));
1173 bfd_map_over_sections (abfd
, elf_locate_sections
, (void *) & ei
);
1175 elf_read_minimal_symbols (objfile
, symfile_flags
, &ei
);
1177 /* ELF debugging information is inserted into the psymtab in the
1178 order of least informative first - most informative last. Since
1179 the psymtab table is searched `most recent insertion first' this
1180 increases the probability that more detailed debug information
1181 for a section is found.
1183 For instance, an object file might contain both .mdebug (XCOFF)
1184 and .debug_info (DWARF2) sections then .mdebug is inserted first
1185 (searched last) and DWARF2 is inserted last (searched first). If
1186 we don't do this then the XCOFF info is found first - for code in
1187 an included file XCOFF info is useless. */
1191 const struct ecoff_debug_swap
*swap
;
1193 /* .mdebug section, presumably holding ECOFF debugging
1195 swap
= get_elf_backend_data (abfd
)->elf_backend_ecoff_debug_swap
;
1197 elfmdebug_build_psymtabs (objfile
, swap
, ei
.mdebugsect
);
1203 /* Stab sections have an associated string table that looks like
1204 a separate section. */
1205 str_sect
= bfd_get_section_by_name (abfd
, ".stabstr");
1207 /* FIXME should probably warn about a stab section without a stabstr. */
1209 elfstab_build_psymtabs (objfile
,
1212 bfd_section_size (abfd
, str_sect
));
1215 if (dwarf2_has_info (objfile
, NULL
))
1217 /* elf_sym_fns_gdb_index cannot handle simultaneous non-DWARF debug
1218 information present in OBJFILE. If there is such debug info present
1219 never use .gdb_index. */
1221 if (!objfile_has_partial_symbols (objfile
)
1222 && dwarf2_initialize_objfile (objfile
))
1223 objfile_set_sym_fns (objfile
, &elf_sym_fns_gdb_index
);
1226 /* It is ok to do this even if the stabs reader made some
1227 partial symbols, because OBJF_PSYMTABS_READ has not been
1228 set, and so our lazy reader function will still be called
1230 objfile_set_sym_fns (objfile
, &elf_sym_fns_lazy_psyms
);
1233 /* If the file has its own symbol tables it has no separate debug
1234 info. `.dynsym'/`.symtab' go to MSYMBOLS, `.debug_info' goes to
1235 SYMTABS/PSYMTABS. `.gnu_debuglink' may no longer be present with
1236 `.note.gnu.build-id'.
1238 .gnu_debugdata is !objfile_has_partial_symbols because it contains only
1239 .symtab, not .debug_* section. But if we already added .gnu_debugdata as
1240 an objfile via find_separate_debug_file_in_section there was no separate
1241 debug info available. Therefore do not attempt to search for another one,
1242 objfile->separate_debug_objfile->separate_debug_objfile GDB guarantees to
1243 be NULL and we would possibly violate it. */
1245 else if (!objfile_has_partial_symbols (objfile
)
1246 && objfile
->separate_debug_objfile
== NULL
1247 && objfile
->separate_debug_objfile_backlink
== NULL
)
1249 gdb::unique_xmalloc_ptr
<char> debugfile
1250 (find_separate_debug_file_by_buildid (objfile
));
1252 if (debugfile
== NULL
)
1253 debugfile
.reset (find_separate_debug_file_by_debuglink (objfile
));
1255 if (debugfile
!= NULL
)
1257 gdb_bfd_ref_ptr
abfd (symfile_bfd_open (debugfile
.get ()));
1259 symbol_file_add_separate (abfd
.get (), debugfile
.get (),
1260 symfile_flags
, objfile
);
1265 /* Callback to lazily read psymtabs. */
1268 read_psyms (struct objfile
*objfile
)
1270 if (dwarf2_has_info (objfile
, NULL
))
1271 dwarf2_build_psymtabs (objfile
);
1274 /* Initialize anything that needs initializing when a completely new symbol
1275 file is specified (not just adding some symbols from another file, e.g. a
1278 We reinitialize buildsym, since we may be reading stabs from an ELF
1282 elf_new_init (struct objfile
*ignore
)
1284 stabsread_new_init ();
1285 buildsym_new_init ();
1288 /* Perform any local cleanups required when we are done with a particular
1289 objfile. I.E, we are in the process of discarding all symbol information
1290 for an objfile, freeing up all memory held for it, and unlinking the
1291 objfile struct from the global list of known objfiles. */
1294 elf_symfile_finish (struct objfile
*objfile
)
1296 dwarf2_free_objfile (objfile
);
1299 /* ELF specific initialization routine for reading symbols. */
1302 elf_symfile_init (struct objfile
*objfile
)
1304 /* ELF objects may be reordered, so set OBJF_REORDERED. If we
1305 find this causes a significant slowdown in gdb then we could
1306 set it in the debug symbol readers only when necessary. */
1307 objfile
->flags
|= OBJF_REORDERED
;
1310 /* Implementation of `sym_get_probes', as documented in symfile.h. */
1312 static const std::vector
<probe
*> &
1313 elf_get_probes (struct objfile
*objfile
)
1315 std::vector
<probe
*> *probes_per_bfd
;
1317 /* Have we parsed this objfile's probes already? */
1318 probes_per_bfd
= (std::vector
<probe
*> *) bfd_data (objfile
->obfd
, probe_key
);
1320 if (probes_per_bfd
== NULL
)
1322 probes_per_bfd
= new std::vector
<probe
*>;
1324 /* Here we try to gather information about all types of probes from the
1326 for (const probe_ops
*ops
: all_probe_ops
)
1327 ops
->get_probes (probes_per_bfd
, objfile
);
1329 set_bfd_data (objfile
->obfd
, probe_key
, probes_per_bfd
);
1332 return *probes_per_bfd
;
1335 /* Helper function used to free the space allocated for storing SystemTap
1336 probe information. */
1339 probe_key_free (bfd
*abfd
, void *d
)
1341 std::vector
<probe
*> *probes
= (std::vector
<probe
*> *) d
;
1343 for (probe
*p
: *probes
)
1344 p
->pops
->destroy (p
);
1351 /* Implementation `sym_probe_fns', as documented in symfile.h. */
1353 static const struct sym_probe_fns elf_probe_fns
=
1355 elf_get_probes
, /* sym_get_probes */
1358 /* Register that we are able to handle ELF object file formats. */
1360 static const struct sym_fns elf_sym_fns
=
1362 elf_new_init
, /* init anything gbl to entire symtab */
1363 elf_symfile_init
, /* read initial info, setup for sym_read() */
1364 elf_symfile_read
, /* read a symbol file into symtab */
1365 NULL
, /* sym_read_psymbols */
1366 elf_symfile_finish
, /* finished with file, cleanup */
1367 default_symfile_offsets
, /* Translate ext. to int. relocation */
1368 elf_symfile_segments
, /* Get segment information from a file. */
1370 default_symfile_relocate
, /* Relocate a debug section. */
1371 &elf_probe_fns
, /* sym_probe_fns */
1375 /* The same as elf_sym_fns, but not registered and lazily reads
1378 const struct sym_fns elf_sym_fns_lazy_psyms
=
1380 elf_new_init
, /* init anything gbl to entire symtab */
1381 elf_symfile_init
, /* read initial info, setup for sym_read() */
1382 elf_symfile_read
, /* read a symbol file into symtab */
1383 read_psyms
, /* sym_read_psymbols */
1384 elf_symfile_finish
, /* finished with file, cleanup */
1385 default_symfile_offsets
, /* Translate ext. to int. relocation */
1386 elf_symfile_segments
, /* Get segment information from a file. */
1388 default_symfile_relocate
, /* Relocate a debug section. */
1389 &elf_probe_fns
, /* sym_probe_fns */
1393 /* The same as elf_sym_fns, but not registered and uses the
1394 DWARF-specific GNU index rather than psymtab. */
1395 const struct sym_fns elf_sym_fns_gdb_index
=
1397 elf_new_init
, /* init anything gbl to entire symab */
1398 elf_symfile_init
, /* read initial info, setup for sym_red() */
1399 elf_symfile_read
, /* read a symbol file into symtab */
1400 NULL
, /* sym_read_psymbols */
1401 elf_symfile_finish
, /* finished with file, cleanup */
1402 default_symfile_offsets
, /* Translate ext. to int. relocatin */
1403 elf_symfile_segments
, /* Get segment information from a file. */
1405 default_symfile_relocate
, /* Relocate a debug section. */
1406 &elf_probe_fns
, /* sym_probe_fns */
1407 &dwarf2_gdb_index_functions
1410 /* STT_GNU_IFUNC resolver vector to be installed to gnu_ifunc_fns_p. */
1412 static const struct gnu_ifunc_fns elf_gnu_ifunc_fns
=
1414 elf_gnu_ifunc_resolve_addr
,
1415 elf_gnu_ifunc_resolve_name
,
1416 elf_gnu_ifunc_resolver_stop
,
1417 elf_gnu_ifunc_resolver_return_stop
1421 _initialize_elfread (void)
1423 probe_key
= register_bfd_data_with_cleanup (NULL
, probe_key_free
);
1424 add_symtab_fns (bfd_target_elf_flavour
, &elf_sym_fns
);
1426 elf_objfile_gnu_ifunc_cache_data
= register_objfile_data ();
1427 gnu_ifunc_fns_p
= &elf_gnu_ifunc_fns
;