1 /* Read ELF (Executable and Linking Format) object files for GDB.
3 Copyright (C) 1991-2019 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"
31 #include "stabsread.h"
32 #include "complaints.h"
35 #include "filenames.h"
37 #include "arch-utils.h"
41 #include "gdbthread.h"
49 #include "mdebugread.h"
51 /* Forward declarations. */
52 extern const struct sym_fns elf_sym_fns_gdb_index
;
53 extern const struct sym_fns elf_sym_fns_debug_names
;
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 /* Type for per-BFD data. */
68 typedef std::vector
<std::unique_ptr
<probe
>> elfread_data
;
70 /* Per-BFD data for probe info. */
72 static const struct bfd_key
<elfread_data
> probe_key
;
74 /* Minimal symbols located at the GOT entries for .plt - that is the real
75 pointer where the given entry will jump to. It gets updated by the real
76 function address during lazy ld.so resolving in the inferior. These
77 minimal symbols are indexed for <tab>-completion. */
79 #define SYMBOL_GOT_PLT_SUFFIX "@got.plt"
81 /* Locate the segments in ABFD. */
83 static struct symfile_segment_data
*
84 elf_symfile_segments (bfd
*abfd
)
86 Elf_Internal_Phdr
*phdrs
, **segments
;
88 int num_phdrs
, num_segments
, num_sections
, i
;
90 struct symfile_segment_data
*data
;
92 phdrs_size
= bfd_get_elf_phdr_upper_bound (abfd
);
96 phdrs
= (Elf_Internal_Phdr
*) alloca (phdrs_size
);
97 num_phdrs
= bfd_get_elf_phdrs (abfd
, phdrs
);
102 segments
= XALLOCAVEC (Elf_Internal_Phdr
*, num_phdrs
);
103 for (i
= 0; i
< num_phdrs
; i
++)
104 if (phdrs
[i
].p_type
== PT_LOAD
)
105 segments
[num_segments
++] = &phdrs
[i
];
107 if (num_segments
== 0)
110 data
= XCNEW (struct symfile_segment_data
);
111 data
->num_segments
= num_segments
;
112 data
->segment_bases
= XCNEWVEC (CORE_ADDR
, num_segments
);
113 data
->segment_sizes
= XCNEWVEC (CORE_ADDR
, num_segments
);
115 for (i
= 0; i
< num_segments
; i
++)
117 data
->segment_bases
[i
] = segments
[i
]->p_vaddr
;
118 data
->segment_sizes
[i
] = segments
[i
]->p_memsz
;
121 num_sections
= bfd_count_sections (abfd
);
122 data
->segment_info
= XCNEWVEC (int, num_sections
);
124 for (i
= 0, sect
= abfd
->sections
; sect
!= NULL
; i
++, sect
= sect
->next
)
128 if ((bfd_section_flags (sect
) & SEC_ALLOC
) == 0)
131 Elf_Internal_Shdr
*this_hdr
= &elf_section_data (sect
)->this_hdr
;
133 for (j
= 0; j
< num_segments
; j
++)
134 if (ELF_SECTION_IN_SEGMENT (this_hdr
, segments
[j
]))
136 data
->segment_info
[i
] = j
+ 1;
140 /* We should have found a segment for every non-empty section.
141 If we haven't, we will not relocate this section by any
142 offsets we apply to the segments. As an exception, do not
143 warn about SHT_NOBITS sections; in normal ELF execution
144 environments, SHT_NOBITS means zero-initialized and belongs
145 in a segment, but in no-OS environments some tools (e.g. ARM
146 RealView) use SHT_NOBITS for uninitialized data. Since it is
147 uninitialized, it doesn't need a program header. Such
148 binaries are not relocatable. */
149 if (bfd_section_size (sect
) > 0 && j
== num_segments
150 && (bfd_section_flags (sect
) & SEC_LOAD
) != 0)
151 warning (_("Loadable section \"%s\" outside of ELF segments"),
152 bfd_section_name (sect
));
158 /* We are called once per section from elf_symfile_read. We
159 need to examine each section we are passed, check to see
160 if it is something we are interested in processing, and
161 if so, stash away some access information for the section.
163 For now we recognize the dwarf debug information sections and
164 line number sections from matching their section names. The
165 ELF definition is no real help here since it has no direct
166 knowledge of DWARF (by design, so any debugging format can be
169 We also recognize the ".stab" sections used by the Sun compilers
170 released with Solaris 2.
172 FIXME: The section names should not be hardwired strings (what
173 should they be? I don't think most object file formats have enough
174 section flags to specify what kind of debug section it is.
178 elf_locate_sections (bfd
*ignore_abfd
, asection
*sectp
, void *eip
)
182 ei
= (struct elfinfo
*) eip
;
183 if (strcmp (sectp
->name
, ".stab") == 0)
185 ei
->stabsect
= sectp
;
187 else if (strcmp (sectp
->name
, ".mdebug") == 0)
189 ei
->mdebugsect
= sectp
;
193 static struct minimal_symbol
*
194 record_minimal_symbol (minimal_symbol_reader
&reader
,
195 const char *name
, int name_len
, bool copy_name
,
197 enum minimal_symbol_type ms_type
,
198 asection
*bfd_section
, struct objfile
*objfile
)
200 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
202 if (ms_type
== mst_text
|| ms_type
== mst_file_text
203 || ms_type
== mst_text_gnu_ifunc
)
204 address
= gdbarch_addr_bits_remove (gdbarch
, address
);
206 struct minimal_symbol
*result
207 = reader
.record_full (name
, name_len
, copy_name
, address
,
209 gdb_bfd_section_index (objfile
->obfd
,
211 if ((objfile
->flags
& OBJF_MAINLINE
) == 0
212 && (ms_type
== mst_data
|| ms_type
== mst_bss
))
213 result
->maybe_copied
= 1;
218 /* Read the symbol table of an ELF file.
220 Given an objfile, a symbol table, and a flag indicating whether the
221 symbol table contains regular, dynamic, or synthetic symbols, add all
222 the global function and data symbols to the minimal symbol table.
224 In stabs-in-ELF, as implemented by Sun, there are some local symbols
225 defined in the ELF symbol table, which can be used to locate
226 the beginnings of sections from each ".o" file that was linked to
227 form the executable objfile. We gather any such info and record it
228 in data structures hung off the objfile's private data. */
232 #define ST_SYNTHETIC 2
235 elf_symtab_read (minimal_symbol_reader
&reader
,
236 struct objfile
*objfile
, int type
,
237 long number_of_symbols
, asymbol
**symbol_table
,
240 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
244 enum minimal_symbol_type ms_type
;
245 /* Name of the last file symbol. This is either a constant string or is
246 saved on the objfile's filename cache. */
247 const char *filesymname
= "";
248 int stripped
= (bfd_get_symcount (objfile
->obfd
) == 0);
249 int elf_make_msymbol_special_p
250 = gdbarch_elf_make_msymbol_special_p (gdbarch
);
252 for (i
= 0; i
< number_of_symbols
; i
++)
254 sym
= symbol_table
[i
];
255 if (sym
->name
== NULL
|| *sym
->name
== '\0')
257 /* Skip names that don't exist (shouldn't happen), or names
258 that are null strings (may happen). */
262 /* Skip "special" symbols, e.g. ARM mapping symbols. These are
263 symbols which do not correspond to objects in the symbol table,
264 but have some other target-specific meaning. */
265 if (bfd_is_target_special_symbol (objfile
->obfd
, sym
))
267 if (gdbarch_record_special_symbol_p (gdbarch
))
268 gdbarch_record_special_symbol (gdbarch
, objfile
, sym
);
272 if (type
== ST_DYNAMIC
273 && sym
->section
== bfd_und_section_ptr
274 && (sym
->flags
& BSF_FUNCTION
))
276 struct minimal_symbol
*msym
;
277 bfd
*abfd
= objfile
->obfd
;
280 /* Symbol is a reference to a function defined in
282 If its value is non zero then it is usually the address
283 of the corresponding entry in the procedure linkage table,
284 plus the desired section offset.
285 If its value is zero then the dynamic linker has to resolve
286 the symbol. We are unable to find any meaningful address
287 for this symbol in the executable file, so we skip it. */
288 symaddr
= sym
->value
;
292 /* sym->section is the undefined section. However, we want to
293 record the section where the PLT stub resides with the
294 minimal symbol. Search the section table for the one that
295 covers the stub's address. */
296 for (sect
= abfd
->sections
; sect
!= NULL
; sect
= sect
->next
)
298 if ((bfd_section_flags (sect
) & SEC_ALLOC
) == 0)
301 if (symaddr
>= bfd_section_vma (sect
)
302 && symaddr
< bfd_section_vma (sect
)
303 + bfd_section_size (sect
))
309 /* On ia64-hpux, we have discovered that the system linker
310 adds undefined symbols with nonzero addresses that cannot
311 be right (their address points inside the code of another
312 function in the .text section). This creates problems
313 when trying to determine which symbol corresponds to
316 We try to detect those buggy symbols by checking which
317 section we think they correspond to. Normally, PLT symbols
318 are stored inside their own section, and the typical name
319 for that section is ".plt". So, if there is a ".plt"
320 section, and yet the section name of our symbol does not
321 start with ".plt", we ignore that symbol. */
322 if (!startswith (sect
->name
, ".plt")
323 && bfd_get_section_by_name (abfd
, ".plt") != NULL
)
326 msym
= record_minimal_symbol
327 (reader
, sym
->name
, strlen (sym
->name
), copy_names
,
328 symaddr
, mst_solib_trampoline
, sect
, objfile
);
331 msym
->filename
= filesymname
;
332 if (elf_make_msymbol_special_p
)
333 gdbarch_elf_make_msymbol_special (gdbarch
, sym
, msym
);
338 /* If it is a nonstripped executable, do not enter dynamic
339 symbols, as the dynamic symbol table is usually a subset
340 of the main symbol table. */
341 if (type
== ST_DYNAMIC
&& !stripped
)
343 if (sym
->flags
& BSF_FILE
)
346 = ((const char *) objfile
->per_bfd
->filename_cache
.insert
347 (sym
->name
, strlen (sym
->name
) + 1));
349 else if (sym
->flags
& BSF_SECTION_SYM
)
351 else if (sym
->flags
& (BSF_GLOBAL
| BSF_LOCAL
| BSF_WEAK
354 struct minimal_symbol
*msym
;
356 /* Select global/local/weak symbols. Note that bfd puts abs
357 symbols in their own section, so all symbols we are
358 interested in will have a section. */
359 /* Bfd symbols are section relative. */
360 symaddr
= sym
->value
+ sym
->section
->vma
;
361 /* For non-absolute symbols, use the type of the section
362 they are relative to, to intuit text/data. Bfd provides
363 no way of figuring this out for absolute symbols. */
364 if (sym
->section
== bfd_abs_section_ptr
)
366 /* This is a hack to get the minimal symbol type
367 right for Irix 5, which has absolute addresses
368 with special section indices for dynamic symbols.
370 NOTE: uweigand-20071112: Synthetic symbols do not
371 have an ELF-private part, so do not touch those. */
372 unsigned int shndx
= type
== ST_SYNTHETIC
? 0 :
373 ((elf_symbol_type
*) sym
)->internal_elf_sym
.st_shndx
;
383 case SHN_MIPS_ACOMMON
:
390 /* If it is an Irix dynamic symbol, skip section name
391 symbols, relocate all others by section offset. */
392 if (ms_type
!= mst_abs
)
394 if (sym
->name
[0] == '.')
398 else if (sym
->section
->flags
& SEC_CODE
)
400 if (sym
->flags
& (BSF_GLOBAL
| BSF_WEAK
| BSF_GNU_UNIQUE
))
402 if (sym
->flags
& BSF_GNU_INDIRECT_FUNCTION
)
403 ms_type
= mst_text_gnu_ifunc
;
407 /* The BSF_SYNTHETIC check is there to omit ppc64 function
408 descriptors mistaken for static functions starting with 'L'.
410 else if ((sym
->name
[0] == '.' && sym
->name
[1] == 'L'
411 && (sym
->flags
& BSF_SYNTHETIC
) == 0)
412 || ((sym
->flags
& BSF_LOCAL
)
413 && sym
->name
[0] == '$'
414 && sym
->name
[1] == 'L'))
415 /* Looks like a compiler-generated label. Skip
416 it. The assembler should be skipping these (to
417 keep executables small), but apparently with
418 gcc on the (deleted) delta m88k SVR4, it loses.
419 So to have us check too should be harmless (but
420 I encourage people to fix this in the assembler
421 instead of adding checks here). */
425 ms_type
= mst_file_text
;
428 else if (sym
->section
->flags
& SEC_ALLOC
)
430 if (sym
->flags
& (BSF_GLOBAL
| BSF_WEAK
| BSF_GNU_UNIQUE
))
432 if (sym
->flags
& BSF_GNU_INDIRECT_FUNCTION
)
434 ms_type
= mst_data_gnu_ifunc
;
436 else if (sym
->section
->flags
& SEC_LOAD
)
445 else if (sym
->flags
& BSF_LOCAL
)
447 if (sym
->section
->flags
& SEC_LOAD
)
449 ms_type
= mst_file_data
;
453 ms_type
= mst_file_bss
;
458 ms_type
= mst_unknown
;
463 /* FIXME: Solaris2 shared libraries include lots of
464 odd "absolute" and "undefined" symbols, that play
465 hob with actions like finding what function the PC
466 is in. Ignore them if they aren't text, data, or bss. */
467 /* ms_type = mst_unknown; */
468 continue; /* Skip this symbol. */
470 msym
= record_minimal_symbol
471 (reader
, sym
->name
, strlen (sym
->name
), copy_names
, symaddr
,
472 ms_type
, sym
->section
, objfile
);
476 /* NOTE: uweigand-20071112: A synthetic symbol does not have an
478 if (type
!= ST_SYNTHETIC
)
480 /* Pass symbol size field in via BFD. FIXME!!! */
481 elf_symbol_type
*elf_sym
= (elf_symbol_type
*) sym
;
482 SET_MSYMBOL_SIZE (msym
, elf_sym
->internal_elf_sym
.st_size
);
485 msym
->filename
= filesymname
;
486 if (elf_make_msymbol_special_p
)
487 gdbarch_elf_make_msymbol_special (gdbarch
, sym
, msym
);
490 /* If we see a default versioned symbol, install it under
491 its version-less name. */
494 const char *atsign
= strchr (sym
->name
, '@');
496 if (atsign
!= NULL
&& atsign
[1] == '@' && atsign
> sym
->name
)
498 int len
= atsign
- sym
->name
;
500 record_minimal_symbol (reader
, sym
->name
, len
, true, symaddr
,
501 ms_type
, sym
->section
, objfile
);
505 /* For @plt symbols, also record a trampoline to the
506 destination symbol. The @plt symbol will be used in
507 disassembly, and the trampoline will be used when we are
508 trying to find the target. */
509 if (msym
&& ms_type
== mst_text
&& type
== ST_SYNTHETIC
)
511 int len
= strlen (sym
->name
);
513 if (len
> 4 && strcmp (sym
->name
+ len
- 4, "@plt") == 0)
515 struct minimal_symbol
*mtramp
;
517 mtramp
= record_minimal_symbol (reader
, sym
->name
, len
- 4,
519 mst_solib_trampoline
,
520 sym
->section
, objfile
);
523 SET_MSYMBOL_SIZE (mtramp
, MSYMBOL_SIZE (msym
));
524 mtramp
->created_by_gdb
= 1;
525 mtramp
->filename
= filesymname
;
526 if (elf_make_msymbol_special_p
)
527 gdbarch_elf_make_msymbol_special (gdbarch
,
536 /* Build minimal symbols named `function@got.plt' (see SYMBOL_GOT_PLT_SUFFIX)
537 for later look ups of which function to call when user requests
538 a STT_GNU_IFUNC function. As the STT_GNU_IFUNC type is found at the target
539 library defining `function' we cannot yet know while reading OBJFILE which
540 of the SYMBOL_GOT_PLT_SUFFIX entries will be needed and later
541 DYN_SYMBOL_TABLE is no longer easily available for OBJFILE. */
544 elf_rel_plt_read (minimal_symbol_reader
&reader
,
545 struct objfile
*objfile
, asymbol
**dyn_symbol_table
)
547 bfd
*obfd
= objfile
->obfd
;
548 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
549 asection
*relplt
, *got_plt
;
550 bfd_size_type reloc_count
, reloc
;
551 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
552 struct type
*ptr_type
= builtin_type (gdbarch
)->builtin_data_ptr
;
553 size_t ptr_size
= TYPE_LENGTH (ptr_type
);
555 if (objfile
->separate_debug_objfile_backlink
)
558 got_plt
= bfd_get_section_by_name (obfd
, ".got.plt");
561 /* For platforms where there is no separate .got.plt. */
562 got_plt
= bfd_get_section_by_name (obfd
, ".got");
567 /* Depending on system, we may find jump slots in a relocation
568 section for either .got.plt or .plt. */
569 asection
*plt
= bfd_get_section_by_name (obfd
, ".plt");
570 int plt_elf_idx
= (plt
!= NULL
) ? elf_section_data (plt
)->this_idx
: -1;
572 int got_plt_elf_idx
= elf_section_data (got_plt
)->this_idx
;
574 /* This search algorithm is from _bfd_elf_canonicalize_dynamic_reloc. */
575 for (relplt
= obfd
->sections
; relplt
!= NULL
; relplt
= relplt
->next
)
577 const auto &this_hdr
= elf_section_data (relplt
)->this_hdr
;
579 if (this_hdr
.sh_type
== SHT_REL
|| this_hdr
.sh_type
== SHT_RELA
)
581 if (this_hdr
.sh_info
== plt_elf_idx
582 || this_hdr
.sh_info
== got_plt_elf_idx
)
589 if (! bed
->s
->slurp_reloc_table (obfd
, relplt
, dyn_symbol_table
, TRUE
))
592 std::string string_buffer
;
594 /* Does ADDRESS reside in SECTION of OBFD? */
595 auto within_section
= [obfd
] (asection
*section
, CORE_ADDR address
)
600 return (bfd_section_vma (section
) <= address
601 && (address
< bfd_section_vma (section
)
602 + bfd_section_size (section
)));
605 reloc_count
= relplt
->size
/ elf_section_data (relplt
)->this_hdr
.sh_entsize
;
606 for (reloc
= 0; reloc
< reloc_count
; reloc
++)
609 struct minimal_symbol
*msym
;
611 const char *got_suffix
= SYMBOL_GOT_PLT_SUFFIX
;
612 const size_t got_suffix_len
= strlen (SYMBOL_GOT_PLT_SUFFIX
);
614 name
= bfd_asymbol_name (*relplt
->relocation
[reloc
].sym_ptr_ptr
);
615 address
= relplt
->relocation
[reloc
].address
;
617 asection
*msym_section
;
619 /* Does the pointer reside in either the .got.plt or .plt
621 if (within_section (got_plt
, address
))
622 msym_section
= got_plt
;
623 else if (within_section (plt
, address
))
628 /* We cannot check if NAME is a reference to
629 mst_text_gnu_ifunc/mst_data_gnu_ifunc as in OBJFILE the
630 symbol is undefined and the objfile having NAME defined may
631 not yet have been loaded. */
633 string_buffer
.assign (name
);
634 string_buffer
.append (got_suffix
, got_suffix
+ got_suffix_len
);
636 msym
= record_minimal_symbol (reader
, string_buffer
.c_str (),
637 string_buffer
.size (),
638 true, address
, mst_slot_got_plt
,
639 msym_section
, objfile
);
641 SET_MSYMBOL_SIZE (msym
, ptr_size
);
645 /* The data pointer is htab_t for gnu_ifunc_record_cache_unchecked. */
647 static const struct objfile_key
<htab
, htab_deleter
>
648 elf_objfile_gnu_ifunc_cache_data
;
650 /* Map function names to CORE_ADDR in elf_objfile_gnu_ifunc_cache_data. */
652 struct elf_gnu_ifunc_cache
654 /* This is always a function entry address, not a function descriptor. */
660 /* htab_hash for elf_objfile_gnu_ifunc_cache_data. */
663 elf_gnu_ifunc_cache_hash (const void *a_voidp
)
665 const struct elf_gnu_ifunc_cache
*a
666 = (const struct elf_gnu_ifunc_cache
*) a_voidp
;
668 return htab_hash_string (a
->name
);
671 /* htab_eq for elf_objfile_gnu_ifunc_cache_data. */
674 elf_gnu_ifunc_cache_eq (const void *a_voidp
, const void *b_voidp
)
676 const struct elf_gnu_ifunc_cache
*a
677 = (const struct elf_gnu_ifunc_cache
*) a_voidp
;
678 const struct elf_gnu_ifunc_cache
*b
679 = (const struct elf_gnu_ifunc_cache
*) b_voidp
;
681 return strcmp (a
->name
, b
->name
) == 0;
684 /* Record the target function address of a STT_GNU_IFUNC function NAME is the
685 function entry address ADDR. Return 1 if NAME and ADDR are considered as
686 valid and therefore they were successfully recorded, return 0 otherwise.
688 Function does not expect a duplicate entry. Use
689 elf_gnu_ifunc_resolve_by_cache first to check if the entry for NAME already
693 elf_gnu_ifunc_record_cache (const char *name
, CORE_ADDR addr
)
695 struct bound_minimal_symbol msym
;
696 struct objfile
*objfile
;
698 struct elf_gnu_ifunc_cache entry_local
, *entry_p
;
701 msym
= lookup_minimal_symbol_by_pc (addr
);
702 if (msym
.minsym
== NULL
)
704 if (BMSYMBOL_VALUE_ADDRESS (msym
) != addr
)
706 objfile
= msym
.objfile
;
708 /* If .plt jumps back to .plt the symbol is still deferred for later
709 resolution and it has no use for GDB. */
710 const char *target_name
= MSYMBOL_LINKAGE_NAME (msym
.minsym
);
711 size_t len
= strlen (target_name
);
713 /* Note we check the symbol's name instead of checking whether the
714 symbol is in the .plt section because some systems have @plt
715 symbols in the .text section. */
716 if (len
> 4 && strcmp (target_name
+ len
- 4, "@plt") == 0)
719 htab
= elf_objfile_gnu_ifunc_cache_data
.get (objfile
);
722 htab
= htab_create_alloc (1, elf_gnu_ifunc_cache_hash
,
723 elf_gnu_ifunc_cache_eq
,
724 NULL
, xcalloc
, xfree
);
725 elf_objfile_gnu_ifunc_cache_data
.set (objfile
, htab
);
728 entry_local
.addr
= addr
;
729 obstack_grow (&objfile
->objfile_obstack
, &entry_local
,
730 offsetof (struct elf_gnu_ifunc_cache
, name
));
731 obstack_grow_str0 (&objfile
->objfile_obstack
, name
);
733 = (struct elf_gnu_ifunc_cache
*) obstack_finish (&objfile
->objfile_obstack
);
735 slot
= htab_find_slot (htab
, entry_p
, INSERT
);
738 struct elf_gnu_ifunc_cache
*entry_found_p
739 = (struct elf_gnu_ifunc_cache
*) *slot
;
740 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
742 if (entry_found_p
->addr
!= addr
)
744 /* This case indicates buggy inferior program, the resolved address
745 should never change. */
747 warning (_("gnu-indirect-function \"%s\" has changed its resolved "
748 "function_address from %s to %s"),
749 name
, paddress (gdbarch
, entry_found_p
->addr
),
750 paddress (gdbarch
, addr
));
753 /* New ENTRY_P is here leaked/duplicate in the OBJFILE obstack. */
760 /* Try to find the target resolved function entry address of a STT_GNU_IFUNC
761 function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P
762 is not NULL) and the function returns 1. It returns 0 otherwise.
764 Only the elf_objfile_gnu_ifunc_cache_data hash table is searched by this
768 elf_gnu_ifunc_resolve_by_cache (const char *name
, CORE_ADDR
*addr_p
)
770 for (objfile
*objfile
: current_program_space
->objfiles ())
773 struct elf_gnu_ifunc_cache
*entry_p
;
776 htab
= elf_objfile_gnu_ifunc_cache_data
.get (objfile
);
780 entry_p
= ((struct elf_gnu_ifunc_cache
*)
781 alloca (sizeof (*entry_p
) + strlen (name
)));
782 strcpy (entry_p
->name
, name
);
784 slot
= htab_find_slot (htab
, entry_p
, NO_INSERT
);
787 entry_p
= (struct elf_gnu_ifunc_cache
*) *slot
;
788 gdb_assert (entry_p
!= NULL
);
791 *addr_p
= entry_p
->addr
;
798 /* Try to find the target resolved function entry address of a STT_GNU_IFUNC
799 function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P
800 is not NULL) and the function returns 1. It returns 0 otherwise.
802 Only the SYMBOL_GOT_PLT_SUFFIX locations are searched by this function.
803 elf_gnu_ifunc_resolve_by_cache must have been already called for NAME to
804 prevent cache entries duplicates. */
807 elf_gnu_ifunc_resolve_by_got (const char *name
, CORE_ADDR
*addr_p
)
810 const size_t got_suffix_len
= strlen (SYMBOL_GOT_PLT_SUFFIX
);
812 name_got_plt
= (char *) alloca (strlen (name
) + got_suffix_len
+ 1);
813 sprintf (name_got_plt
, "%s" SYMBOL_GOT_PLT_SUFFIX
, name
);
815 for (objfile
*objfile
: current_program_space
->objfiles ())
817 bfd
*obfd
= objfile
->obfd
;
818 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
819 struct type
*ptr_type
= builtin_type (gdbarch
)->builtin_data_ptr
;
820 size_t ptr_size
= TYPE_LENGTH (ptr_type
);
821 CORE_ADDR pointer_address
, addr
;
823 gdb_byte
*buf
= (gdb_byte
*) alloca (ptr_size
);
824 struct bound_minimal_symbol msym
;
826 msym
= lookup_minimal_symbol (name_got_plt
, NULL
, objfile
);
827 if (msym
.minsym
== NULL
)
829 if (MSYMBOL_TYPE (msym
.minsym
) != mst_slot_got_plt
)
831 pointer_address
= BMSYMBOL_VALUE_ADDRESS (msym
);
833 plt
= bfd_get_section_by_name (obfd
, ".plt");
837 if (MSYMBOL_SIZE (msym
.minsym
) != ptr_size
)
839 if (target_read_memory (pointer_address
, buf
, ptr_size
) != 0)
841 addr
= extract_typed_address (buf
, ptr_type
);
842 addr
= gdbarch_convert_from_func_ptr_addr (gdbarch
, addr
,
843 current_top_target ());
844 addr
= gdbarch_addr_bits_remove (gdbarch
, addr
);
846 if (elf_gnu_ifunc_record_cache (name
, addr
))
857 /* Try to find the target resolved function entry address of a STT_GNU_IFUNC
858 function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P
859 is not NULL) and the function returns true. It returns false otherwise.
861 Both the elf_objfile_gnu_ifunc_cache_data hash table and
862 SYMBOL_GOT_PLT_SUFFIX locations are searched by this function. */
865 elf_gnu_ifunc_resolve_name (const char *name
, CORE_ADDR
*addr_p
)
867 if (elf_gnu_ifunc_resolve_by_cache (name
, addr_p
))
870 if (elf_gnu_ifunc_resolve_by_got (name
, addr_p
))
876 /* Call STT_GNU_IFUNC - a function returning addresss of a real function to
877 call. PC is theSTT_GNU_IFUNC resolving function entry. The value returned
878 is the entry point of the resolved STT_GNU_IFUNC target function to call.
882 elf_gnu_ifunc_resolve_addr (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
884 const char *name_at_pc
;
885 CORE_ADDR start_at_pc
, address
;
886 struct type
*func_func_type
= builtin_type (gdbarch
)->builtin_func_func
;
887 struct value
*function
, *address_val
;
889 struct value
*hwcap_val
;
891 /* Try first any non-intrusive methods without an inferior call. */
893 if (find_pc_partial_function (pc
, &name_at_pc
, &start_at_pc
, NULL
)
894 && start_at_pc
== pc
)
896 if (elf_gnu_ifunc_resolve_name (name_at_pc
, &address
))
902 function
= allocate_value (func_func_type
);
903 VALUE_LVAL (function
) = lval_memory
;
904 set_value_address (function
, pc
);
906 /* STT_GNU_IFUNC resolver functions usually receive the HWCAP vector as
907 parameter. FUNCTION is the function entry address. ADDRESS may be a
908 function descriptor. */
910 target_auxv_search (current_top_target (), AT_HWCAP
, &hwcap
);
911 hwcap_val
= value_from_longest (builtin_type (gdbarch
)
912 ->builtin_unsigned_long
, hwcap
);
913 address_val
= call_function_by_hand (function
, NULL
, hwcap_val
);
914 address
= value_as_address (address_val
);
915 address
= gdbarch_convert_from_func_ptr_addr (gdbarch
, address
, current_top_target ());
916 address
= gdbarch_addr_bits_remove (gdbarch
, address
);
919 elf_gnu_ifunc_record_cache (name_at_pc
, address
);
924 /* Handle inferior hit of bp_gnu_ifunc_resolver, see its definition. */
927 elf_gnu_ifunc_resolver_stop (struct breakpoint
*b
)
929 struct breakpoint
*b_return
;
930 struct frame_info
*prev_frame
= get_prev_frame (get_current_frame ());
931 struct frame_id prev_frame_id
= get_stack_frame_id (prev_frame
);
932 CORE_ADDR prev_pc
= get_frame_pc (prev_frame
);
933 int thread_id
= inferior_thread ()->global_num
;
935 gdb_assert (b
->type
== bp_gnu_ifunc_resolver
);
937 for (b_return
= b
->related_breakpoint
; b_return
!= b
;
938 b_return
= b_return
->related_breakpoint
)
940 gdb_assert (b_return
->type
== bp_gnu_ifunc_resolver_return
);
941 gdb_assert (b_return
->loc
!= NULL
&& b_return
->loc
->next
== NULL
);
942 gdb_assert (frame_id_p (b_return
->frame_id
));
944 if (b_return
->thread
== thread_id
945 && b_return
->loc
->requested_address
== prev_pc
946 && frame_id_eq (b_return
->frame_id
, prev_frame_id
))
952 /* No need to call find_pc_line for symbols resolving as this is only
953 a helper breakpointer never shown to the user. */
956 sal
.pspace
= current_inferior ()->pspace
;
958 sal
.section
= find_pc_overlay (sal
.pc
);
961 = set_momentary_breakpoint (get_frame_arch (prev_frame
), sal
,
963 bp_gnu_ifunc_resolver_return
).release ();
965 /* set_momentary_breakpoint invalidates PREV_FRAME. */
968 /* Add new b_return to the ring list b->related_breakpoint. */
969 gdb_assert (b_return
->related_breakpoint
== b_return
);
970 b_return
->related_breakpoint
= b
->related_breakpoint
;
971 b
->related_breakpoint
= b_return
;
975 /* Handle inferior hit of bp_gnu_ifunc_resolver_return, see its definition. */
978 elf_gnu_ifunc_resolver_return_stop (struct breakpoint
*b
)
980 thread_info
*thread
= inferior_thread ();
981 struct gdbarch
*gdbarch
= get_frame_arch (get_current_frame ());
982 struct type
*func_func_type
= builtin_type (gdbarch
)->builtin_func_func
;
983 struct type
*value_type
= TYPE_TARGET_TYPE (func_func_type
);
984 struct regcache
*regcache
= get_thread_regcache (thread
);
985 struct value
*func_func
;
987 CORE_ADDR resolved_address
, resolved_pc
;
989 gdb_assert (b
->type
== bp_gnu_ifunc_resolver_return
);
991 while (b
->related_breakpoint
!= b
)
993 struct breakpoint
*b_next
= b
->related_breakpoint
;
997 case bp_gnu_ifunc_resolver
:
999 case bp_gnu_ifunc_resolver_return
:
1000 delete_breakpoint (b
);
1003 internal_error (__FILE__
, __LINE__
,
1004 _("handle_inferior_event: Invalid "
1005 "gnu-indirect-function breakpoint type %d"),
1010 gdb_assert (b
->type
== bp_gnu_ifunc_resolver
);
1011 gdb_assert (b
->loc
->next
== NULL
);
1013 func_func
= allocate_value (func_func_type
);
1014 VALUE_LVAL (func_func
) = lval_memory
;
1015 set_value_address (func_func
, b
->loc
->related_address
);
1017 value
= allocate_value (value_type
);
1018 gdbarch_return_value (gdbarch
, func_func
, value_type
, regcache
,
1019 value_contents_raw (value
), NULL
);
1020 resolved_address
= value_as_address (value
);
1021 resolved_pc
= gdbarch_convert_from_func_ptr_addr (gdbarch
,
1023 current_top_target ());
1024 resolved_pc
= gdbarch_addr_bits_remove (gdbarch
, resolved_pc
);
1026 gdb_assert (current_program_space
== b
->pspace
|| b
->pspace
== NULL
);
1027 elf_gnu_ifunc_record_cache (event_location_to_string (b
->location
.get ()),
1030 b
->type
= bp_breakpoint
;
1031 update_breakpoint_locations (b
, current_program_space
,
1032 find_function_start_sal (resolved_pc
, NULL
, true),
1036 /* A helper function for elf_symfile_read that reads the minimal
1040 elf_read_minimal_symbols (struct objfile
*objfile
, int symfile_flags
,
1041 const struct elfinfo
*ei
)
1043 bfd
*synth_abfd
, *abfd
= objfile
->obfd
;
1044 long symcount
= 0, dynsymcount
= 0, synthcount
, storage_needed
;
1045 asymbol
**symbol_table
= NULL
, **dyn_symbol_table
= NULL
;
1048 if (symtab_create_debug
)
1050 fprintf_unfiltered (gdb_stdlog
,
1051 "Reading minimal symbols of objfile %s ...\n",
1052 objfile_name (objfile
));
1055 /* If we already have minsyms, then we can skip some work here.
1056 However, if there were stabs or mdebug sections, we go ahead and
1057 redo all the work anyway, because the psym readers for those
1058 kinds of debuginfo need extra information found here. This can
1059 go away once all types of symbols are in the per-BFD object. */
1060 if (objfile
->per_bfd
->minsyms_read
1061 && ei
->stabsect
== NULL
1062 && ei
->mdebugsect
== NULL
)
1064 if (symtab_create_debug
)
1065 fprintf_unfiltered (gdb_stdlog
,
1066 "... minimal symbols previously read\n");
1070 minimal_symbol_reader
reader (objfile
);
1072 /* Process the normal ELF symbol table first. */
1074 storage_needed
= bfd_get_symtab_upper_bound (objfile
->obfd
);
1075 if (storage_needed
< 0)
1076 error (_("Can't read symbols from %s: %s"),
1077 bfd_get_filename (objfile
->obfd
),
1078 bfd_errmsg (bfd_get_error ()));
1080 if (storage_needed
> 0)
1082 /* Memory gets permanently referenced from ABFD after
1083 bfd_canonicalize_symtab so it must not get freed before ABFD gets. */
1085 symbol_table
= (asymbol
**) bfd_alloc (abfd
, storage_needed
);
1086 symcount
= bfd_canonicalize_symtab (objfile
->obfd
, symbol_table
);
1089 error (_("Can't read symbols from %s: %s"),
1090 bfd_get_filename (objfile
->obfd
),
1091 bfd_errmsg (bfd_get_error ()));
1093 elf_symtab_read (reader
, objfile
, ST_REGULAR
, symcount
, symbol_table
,
1097 /* Add the dynamic symbols. */
1099 storage_needed
= bfd_get_dynamic_symtab_upper_bound (objfile
->obfd
);
1101 if (storage_needed
> 0)
1103 /* Memory gets permanently referenced from ABFD after
1104 bfd_get_synthetic_symtab so it must not get freed before ABFD gets.
1105 It happens only in the case when elf_slurp_reloc_table sees
1106 asection->relocation NULL. Determining which section is asection is
1107 done by _bfd_elf_get_synthetic_symtab which is all a bfd
1108 implementation detail, though. */
1110 dyn_symbol_table
= (asymbol
**) bfd_alloc (abfd
, storage_needed
);
1111 dynsymcount
= bfd_canonicalize_dynamic_symtab (objfile
->obfd
,
1114 if (dynsymcount
< 0)
1115 error (_("Can't read symbols from %s: %s"),
1116 bfd_get_filename (objfile
->obfd
),
1117 bfd_errmsg (bfd_get_error ()));
1119 elf_symtab_read (reader
, objfile
, ST_DYNAMIC
, dynsymcount
,
1120 dyn_symbol_table
, false);
1122 elf_rel_plt_read (reader
, objfile
, dyn_symbol_table
);
1125 /* Contrary to binutils --strip-debug/--only-keep-debug the strip command from
1126 elfutils (eu-strip) moves even the .symtab section into the .debug file.
1128 bfd_get_synthetic_symtab on ppc64 for each function descriptor ELF symbol
1129 'name' creates a new BSF_SYNTHETIC ELF symbol '.name' with its code
1130 address. But with eu-strip files bfd_get_synthetic_symtab would fail to
1131 read the code address from .opd while it reads the .symtab section from
1132 a separate debug info file as the .opd section is SHT_NOBITS there.
1134 With SYNTH_ABFD the .opd section will be read from the original
1135 backlinked binary where it is valid. */
1137 if (objfile
->separate_debug_objfile_backlink
)
1138 synth_abfd
= objfile
->separate_debug_objfile_backlink
->obfd
;
1142 /* Add synthetic symbols - for instance, names for any PLT entries. */
1144 synthcount
= bfd_get_synthetic_symtab (synth_abfd
, symcount
, symbol_table
,
1145 dynsymcount
, dyn_symbol_table
,
1151 std::unique_ptr
<asymbol
*[]>
1152 synth_symbol_table (new asymbol
*[synthcount
]);
1153 for (i
= 0; i
< synthcount
; i
++)
1154 synth_symbol_table
[i
] = synthsyms
+ i
;
1155 elf_symtab_read (reader
, objfile
, ST_SYNTHETIC
, synthcount
,
1156 synth_symbol_table
.get (), true);
1162 /* Install any minimal symbols that have been collected as the current
1163 minimal symbols for this objfile. The debug readers below this point
1164 should not generate new minimal symbols; if they do it's their
1165 responsibility to install them. "mdebug" appears to be the only one
1166 which will do this. */
1170 if (symtab_create_debug
)
1171 fprintf_unfiltered (gdb_stdlog
, "Done reading minimal symbols.\n");
1174 /* Scan and build partial symbols for a symbol file.
1175 We have been initialized by a call to elf_symfile_init, which
1176 currently does nothing.
1178 This function only does the minimum work necessary for letting the
1179 user "name" things symbolically; it does not read the entire symtab.
1180 Instead, it reads the external and static symbols and puts them in partial
1181 symbol tables. When more extensive information is requested of a
1182 file, the corresponding partial symbol table is mutated into a full
1183 fledged symbol table by going back and reading the symbols
1186 We look for sections with specific names, to tell us what debug
1187 format to look for: FIXME!!!
1189 elfstab_build_psymtabs() handles STABS symbols;
1190 mdebug_build_psymtabs() handles ECOFF debugging information.
1192 Note that ELF files have a "minimal" symbol table, which looks a lot
1193 like a COFF symbol table, but has only the minimal information necessary
1194 for linking. We process this also, and use the information to
1195 build gdb's minimal symbol table. This gives us some minimal debugging
1196 capability even for files compiled without -g. */
1199 elf_symfile_read (struct objfile
*objfile
, symfile_add_flags symfile_flags
)
1201 bfd
*abfd
= objfile
->obfd
;
1204 memset ((char *) &ei
, 0, sizeof (ei
));
1205 if (!(objfile
->flags
& OBJF_READNEVER
))
1206 bfd_map_over_sections (abfd
, elf_locate_sections
, (void *) & ei
);
1208 elf_read_minimal_symbols (objfile
, symfile_flags
, &ei
);
1210 /* ELF debugging information is inserted into the psymtab in the
1211 order of least informative first - most informative last. Since
1212 the psymtab table is searched `most recent insertion first' this
1213 increases the probability that more detailed debug information
1214 for a section is found.
1216 For instance, an object file might contain both .mdebug (XCOFF)
1217 and .debug_info (DWARF2) sections then .mdebug is inserted first
1218 (searched last) and DWARF2 is inserted last (searched first). If
1219 we don't do this then the XCOFF info is found first - for code in
1220 an included file XCOFF info is useless. */
1224 const struct ecoff_debug_swap
*swap
;
1226 /* .mdebug section, presumably holding ECOFF debugging
1228 swap
= get_elf_backend_data (abfd
)->elf_backend_ecoff_debug_swap
;
1230 elfmdebug_build_psymtabs (objfile
, swap
, ei
.mdebugsect
);
1236 /* Stab sections have an associated string table that looks like
1237 a separate section. */
1238 str_sect
= bfd_get_section_by_name (abfd
, ".stabstr");
1240 /* FIXME should probably warn about a stab section without a stabstr. */
1242 elfstab_build_psymtabs (objfile
,
1245 bfd_section_size (str_sect
));
1248 if (dwarf2_has_info (objfile
, NULL
, true))
1250 dw_index_kind index_kind
;
1252 /* elf_sym_fns_gdb_index cannot handle simultaneous non-DWARF
1253 debug information present in OBJFILE. If there is such debug
1254 info present never use an index. */
1255 if (!objfile_has_partial_symbols (objfile
)
1256 && dwarf2_initialize_objfile (objfile
, &index_kind
))
1260 case dw_index_kind::GDB_INDEX
:
1261 objfile_set_sym_fns (objfile
, &elf_sym_fns_gdb_index
);
1263 case dw_index_kind::DEBUG_NAMES
:
1264 objfile_set_sym_fns (objfile
, &elf_sym_fns_debug_names
);
1270 /* It is ok to do this even if the stabs reader made some
1271 partial symbols, because OBJF_PSYMTABS_READ has not been
1272 set, and so our lazy reader function will still be called
1274 objfile_set_sym_fns (objfile
, &elf_sym_fns_lazy_psyms
);
1277 /* If the file has its own symbol tables it has no separate debug
1278 info. `.dynsym'/`.symtab' go to MSYMBOLS, `.debug_info' goes to
1279 SYMTABS/PSYMTABS. `.gnu_debuglink' may no longer be present with
1280 `.note.gnu.build-id'.
1282 .gnu_debugdata is !objfile_has_partial_symbols because it contains only
1283 .symtab, not .debug_* section. But if we already added .gnu_debugdata as
1284 an objfile via find_separate_debug_file_in_section there was no separate
1285 debug info available. Therefore do not attempt to search for another one,
1286 objfile->separate_debug_objfile->separate_debug_objfile GDB guarantees to
1287 be NULL and we would possibly violate it. */
1289 else if (!objfile_has_partial_symbols (objfile
)
1290 && objfile
->separate_debug_objfile
== NULL
1291 && objfile
->separate_debug_objfile_backlink
== NULL
)
1293 std::string debugfile
= find_separate_debug_file_by_buildid (objfile
);
1295 if (debugfile
.empty ())
1296 debugfile
= find_separate_debug_file_by_debuglink (objfile
);
1298 if (!debugfile
.empty ())
1300 gdb_bfd_ref_ptr
debug_bfd (symfile_bfd_open (debugfile
.c_str ()));
1302 symbol_file_add_separate (debug_bfd
.get (), debugfile
.c_str (),
1303 symfile_flags
, objfile
);
1308 /* Callback to lazily read psymtabs. */
1311 read_psyms (struct objfile
*objfile
)
1313 if (dwarf2_has_info (objfile
, NULL
))
1314 dwarf2_build_psymtabs (objfile
);
1317 /* Initialize anything that needs initializing when a completely new symbol
1318 file is specified (not just adding some symbols from another file, e.g. a
1322 elf_new_init (struct objfile
*ignore
)
1326 /* Perform any local cleanups required when we are done with a particular
1327 objfile. I.E, we are in the process of discarding all symbol information
1328 for an objfile, freeing up all memory held for it, and unlinking the
1329 objfile struct from the global list of known objfiles. */
1332 elf_symfile_finish (struct objfile
*objfile
)
1336 /* ELF specific initialization routine for reading symbols. */
1339 elf_symfile_init (struct objfile
*objfile
)
1341 /* ELF objects may be reordered, so set OBJF_REORDERED. If we
1342 find this causes a significant slowdown in gdb then we could
1343 set it in the debug symbol readers only when necessary. */
1344 objfile
->flags
|= OBJF_REORDERED
;
1347 /* Implementation of `sym_get_probes', as documented in symfile.h. */
1349 static const elfread_data
&
1350 elf_get_probes (struct objfile
*objfile
)
1352 elfread_data
*probes_per_bfd
= probe_key
.get (objfile
->obfd
);
1354 if (probes_per_bfd
== NULL
)
1356 probes_per_bfd
= probe_key
.emplace (objfile
->obfd
);
1358 /* Here we try to gather information about all types of probes from the
1360 for (const static_probe_ops
*ops
: all_static_probe_ops
)
1361 ops
->get_probes (probes_per_bfd
, objfile
);
1364 return *probes_per_bfd
;
1369 /* Implementation `sym_probe_fns', as documented in symfile.h. */
1371 static const struct sym_probe_fns elf_probe_fns
=
1373 elf_get_probes
, /* sym_get_probes */
1376 /* Register that we are able to handle ELF object file formats. */
1378 static const struct sym_fns elf_sym_fns
=
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 NULL
, /* 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 lazily reads
1396 const struct sym_fns elf_sym_fns_lazy_psyms
=
1398 elf_new_init
, /* init anything gbl to entire symtab */
1399 elf_symfile_init
, /* read initial info, setup for sym_read() */
1400 elf_symfile_read
, /* read a symbol file into symtab */
1401 read_psyms
, /* sym_read_psymbols */
1402 elf_symfile_finish
, /* finished with file, cleanup */
1403 default_symfile_offsets
, /* Translate ext. to int. relocation */
1404 elf_symfile_segments
, /* Get segment information from a file. */
1406 default_symfile_relocate
, /* Relocate a debug section. */
1407 &elf_probe_fns
, /* sym_probe_fns */
1411 /* The same as elf_sym_fns, but not registered and uses the
1412 DWARF-specific GNU index rather than psymtab. */
1413 const struct sym_fns elf_sym_fns_gdb_index
=
1415 elf_new_init
, /* init anything gbl to entire symab */
1416 elf_symfile_init
, /* read initial info, setup for sym_red() */
1417 elf_symfile_read
, /* read a symbol file into symtab */
1418 NULL
, /* sym_read_psymbols */
1419 elf_symfile_finish
, /* finished with file, cleanup */
1420 default_symfile_offsets
, /* Translate ext. to int. relocatin */
1421 elf_symfile_segments
, /* Get segment information from a file. */
1423 default_symfile_relocate
, /* Relocate a debug section. */
1424 &elf_probe_fns
, /* sym_probe_fns */
1425 &dwarf2_gdb_index_functions
1428 /* The same as elf_sym_fns, but not registered and uses the
1429 DWARF-specific .debug_names index rather than psymtab. */
1430 const struct sym_fns elf_sym_fns_debug_names
=
1432 elf_new_init
, /* init anything gbl to entire symab */
1433 elf_symfile_init
, /* read initial info, setup for sym_red() */
1434 elf_symfile_read
, /* read a symbol file into symtab */
1435 NULL
, /* sym_read_psymbols */
1436 elf_symfile_finish
, /* finished with file, cleanup */
1437 default_symfile_offsets
, /* Translate ext. to int. relocatin */
1438 elf_symfile_segments
, /* Get segment information from a file. */
1440 default_symfile_relocate
, /* Relocate a debug section. */
1441 &elf_probe_fns
, /* sym_probe_fns */
1442 &dwarf2_debug_names_functions
1445 /* STT_GNU_IFUNC resolver vector to be installed to gnu_ifunc_fns_p. */
1447 static const struct gnu_ifunc_fns elf_gnu_ifunc_fns
=
1449 elf_gnu_ifunc_resolve_addr
,
1450 elf_gnu_ifunc_resolve_name
,
1451 elf_gnu_ifunc_resolver_stop
,
1452 elf_gnu_ifunc_resolver_return_stop
1456 _initialize_elfread (void)
1458 add_symtab_fns (bfd_target_elf_flavour
, &elf_sym_fns
);
1460 gnu_ifunc_fns_p
= &elf_gnu_ifunc_fns
;