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"
52 /* Forward declarations. */
53 extern const struct sym_fns elf_sym_fns_gdb_index
;
54 extern const struct sym_fns elf_sym_fns_debug_names
;
55 extern const struct sym_fns elf_sym_fns_lazy_psyms
;
57 /* The struct elfinfo is available only during ELF symbol table and
58 psymtab reading. It is destroyed at the completion of psymtab-reading.
59 It's local to elf_symfile_read. */
63 asection
*stabsect
; /* Section pointer for .stab section */
64 asection
*mdebugsect
; /* Section pointer for .mdebug section */
65 asection
*ctfsect
; /* Section pointer for .ctf section */
68 /* Type for per-BFD data. */
70 typedef std::vector
<std::unique_ptr
<probe
>> elfread_data
;
72 /* Per-BFD data for probe info. */
74 static const struct bfd_key
<elfread_data
> probe_key
;
76 /* Minimal symbols located at the GOT entries for .plt - that is the real
77 pointer where the given entry will jump to. It gets updated by the real
78 function address during lazy ld.so resolving in the inferior. These
79 minimal symbols are indexed for <tab>-completion. */
81 #define SYMBOL_GOT_PLT_SUFFIX "@got.plt"
83 /* Locate the segments in ABFD. */
85 static struct symfile_segment_data
*
86 elf_symfile_segments (bfd
*abfd
)
88 Elf_Internal_Phdr
*phdrs
, **segments
;
90 int num_phdrs
, num_segments
, num_sections
, i
;
92 struct symfile_segment_data
*data
;
94 phdrs_size
= bfd_get_elf_phdr_upper_bound (abfd
);
98 phdrs
= (Elf_Internal_Phdr
*) alloca (phdrs_size
);
99 num_phdrs
= bfd_get_elf_phdrs (abfd
, phdrs
);
104 segments
= XALLOCAVEC (Elf_Internal_Phdr
*, num_phdrs
);
105 for (i
= 0; i
< num_phdrs
; i
++)
106 if (phdrs
[i
].p_type
== PT_LOAD
)
107 segments
[num_segments
++] = &phdrs
[i
];
109 if (num_segments
== 0)
112 data
= XCNEW (struct symfile_segment_data
);
113 data
->num_segments
= num_segments
;
114 data
->segment_bases
= XCNEWVEC (CORE_ADDR
, num_segments
);
115 data
->segment_sizes
= XCNEWVEC (CORE_ADDR
, num_segments
);
117 for (i
= 0; i
< num_segments
; i
++)
119 data
->segment_bases
[i
] = segments
[i
]->p_vaddr
;
120 data
->segment_sizes
[i
] = segments
[i
]->p_memsz
;
123 num_sections
= bfd_count_sections (abfd
);
124 data
->segment_info
= XCNEWVEC (int, num_sections
);
126 for (i
= 0, sect
= abfd
->sections
; sect
!= NULL
; i
++, sect
= sect
->next
)
130 if ((bfd_section_flags (sect
) & SEC_ALLOC
) == 0)
133 Elf_Internal_Shdr
*this_hdr
= &elf_section_data (sect
)->this_hdr
;
135 for (j
= 0; j
< num_segments
; j
++)
136 if (ELF_SECTION_IN_SEGMENT (this_hdr
, segments
[j
]))
138 data
->segment_info
[i
] = j
+ 1;
142 /* We should have found a segment for every non-empty section.
143 If we haven't, we will not relocate this section by any
144 offsets we apply to the segments. As an exception, do not
145 warn about SHT_NOBITS sections; in normal ELF execution
146 environments, SHT_NOBITS means zero-initialized and belongs
147 in a segment, but in no-OS environments some tools (e.g. ARM
148 RealView) use SHT_NOBITS for uninitialized data. Since it is
149 uninitialized, it doesn't need a program header. Such
150 binaries are not relocatable. */
151 if (bfd_section_size (sect
) > 0 && j
== num_segments
152 && (bfd_section_flags (sect
) & SEC_LOAD
) != 0)
153 warning (_("Loadable section \"%s\" outside of ELF segments"),
154 bfd_section_name (sect
));
160 /* We are called once per section from elf_symfile_read. We
161 need to examine each section we are passed, check to see
162 if it is something we are interested in processing, and
163 if so, stash away some access information for the section.
165 For now we recognize the dwarf debug information sections and
166 line number sections from matching their section names. The
167 ELF definition is no real help here since it has no direct
168 knowledge of DWARF (by design, so any debugging format can be
171 We also recognize the ".stab" sections used by the Sun compilers
172 released with Solaris 2.
174 FIXME: The section names should not be hardwired strings (what
175 should they be? I don't think most object file formats have enough
176 section flags to specify what kind of debug section it is.
180 elf_locate_sections (bfd
*ignore_abfd
, asection
*sectp
, void *eip
)
184 ei
= (struct elfinfo
*) eip
;
185 if (strcmp (sectp
->name
, ".stab") == 0)
187 ei
->stabsect
= sectp
;
189 else if (strcmp (sectp
->name
, ".mdebug") == 0)
191 ei
->mdebugsect
= sectp
;
193 else if (strcmp (sectp
->name
, ".ctf") == 0)
199 static struct minimal_symbol
*
200 record_minimal_symbol (minimal_symbol_reader
&reader
,
201 const char *name
, int name_len
, bool copy_name
,
203 enum minimal_symbol_type ms_type
,
204 asection
*bfd_section
, struct objfile
*objfile
)
206 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
208 if (ms_type
== mst_text
|| ms_type
== mst_file_text
209 || ms_type
== mst_text_gnu_ifunc
)
210 address
= gdbarch_addr_bits_remove (gdbarch
, address
);
212 struct minimal_symbol
*result
213 = reader
.record_full (name
, name_len
, copy_name
, address
,
215 gdb_bfd_section_index (objfile
->obfd
,
217 if ((objfile
->flags
& OBJF_MAINLINE
) == 0
218 && (ms_type
== mst_data
|| ms_type
== mst_bss
))
219 result
->maybe_copied
= 1;
224 /* Read the symbol table of an ELF file.
226 Given an objfile, a symbol table, and a flag indicating whether the
227 symbol table contains regular, dynamic, or synthetic symbols, add all
228 the global function and data symbols to the minimal symbol table.
230 In stabs-in-ELF, as implemented by Sun, there are some local symbols
231 defined in the ELF symbol table, which can be used to locate
232 the beginnings of sections from each ".o" file that was linked to
233 form the executable objfile. We gather any such info and record it
234 in data structures hung off the objfile's private data. */
238 #define ST_SYNTHETIC 2
241 elf_symtab_read (minimal_symbol_reader
&reader
,
242 struct objfile
*objfile
, int type
,
243 long number_of_symbols
, asymbol
**symbol_table
,
246 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
250 enum minimal_symbol_type ms_type
;
251 /* Name of the last file symbol. This is either a constant string or is
252 saved on the objfile's filename cache. */
253 const char *filesymname
= "";
254 int stripped
= (bfd_get_symcount (objfile
->obfd
) == 0);
255 int elf_make_msymbol_special_p
256 = gdbarch_elf_make_msymbol_special_p (gdbarch
);
258 for (i
= 0; i
< number_of_symbols
; i
++)
260 sym
= symbol_table
[i
];
261 if (sym
->name
== NULL
|| *sym
->name
== '\0')
263 /* Skip names that don't exist (shouldn't happen), or names
264 that are null strings (may happen). */
268 /* Skip "special" symbols, e.g. ARM mapping symbols. These are
269 symbols which do not correspond to objects in the symbol table,
270 but have some other target-specific meaning. */
271 if (bfd_is_target_special_symbol (objfile
->obfd
, sym
))
273 if (gdbarch_record_special_symbol_p (gdbarch
))
274 gdbarch_record_special_symbol (gdbarch
, objfile
, sym
);
278 if (type
== ST_DYNAMIC
279 && sym
->section
== bfd_und_section_ptr
280 && (sym
->flags
& BSF_FUNCTION
))
282 struct minimal_symbol
*msym
;
283 bfd
*abfd
= objfile
->obfd
;
286 /* Symbol is a reference to a function defined in
288 If its value is non zero then it is usually the address
289 of the corresponding entry in the procedure linkage table,
290 plus the desired section offset.
291 If its value is zero then the dynamic linker has to resolve
292 the symbol. We are unable to find any meaningful address
293 for this symbol in the executable file, so we skip it. */
294 symaddr
= sym
->value
;
298 /* sym->section is the undefined section. However, we want to
299 record the section where the PLT stub resides with the
300 minimal symbol. Search the section table for the one that
301 covers the stub's address. */
302 for (sect
= abfd
->sections
; sect
!= NULL
; sect
= sect
->next
)
304 if ((bfd_section_flags (sect
) & SEC_ALLOC
) == 0)
307 if (symaddr
>= bfd_section_vma (sect
)
308 && symaddr
< bfd_section_vma (sect
)
309 + bfd_section_size (sect
))
315 /* On ia64-hpux, we have discovered that the system linker
316 adds undefined symbols with nonzero addresses that cannot
317 be right (their address points inside the code of another
318 function in the .text section). This creates problems
319 when trying to determine which symbol corresponds to
322 We try to detect those buggy symbols by checking which
323 section we think they correspond to. Normally, PLT symbols
324 are stored inside their own section, and the typical name
325 for that section is ".plt". So, if there is a ".plt"
326 section, and yet the section name of our symbol does not
327 start with ".plt", we ignore that symbol. */
328 if (!startswith (sect
->name
, ".plt")
329 && bfd_get_section_by_name (abfd
, ".plt") != NULL
)
332 msym
= record_minimal_symbol
333 (reader
, sym
->name
, strlen (sym
->name
), copy_names
,
334 symaddr
, mst_solib_trampoline
, sect
, objfile
);
337 msym
->filename
= filesymname
;
338 if (elf_make_msymbol_special_p
)
339 gdbarch_elf_make_msymbol_special (gdbarch
, sym
, msym
);
344 /* If it is a nonstripped executable, do not enter dynamic
345 symbols, as the dynamic symbol table is usually a subset
346 of the main symbol table. */
347 if (type
== ST_DYNAMIC
&& !stripped
)
349 if (sym
->flags
& BSF_FILE
)
352 = ((const char *) objfile
->per_bfd
->filename_cache
.insert
353 (sym
->name
, strlen (sym
->name
) + 1));
355 else if (sym
->flags
& BSF_SECTION_SYM
)
357 else if (sym
->flags
& (BSF_GLOBAL
| BSF_LOCAL
| BSF_WEAK
360 struct minimal_symbol
*msym
;
362 /* Select global/local/weak symbols. Note that bfd puts abs
363 symbols in their own section, so all symbols we are
364 interested in will have a section. */
365 /* Bfd symbols are section relative. */
366 symaddr
= sym
->value
+ sym
->section
->vma
;
367 /* For non-absolute symbols, use the type of the section
368 they are relative to, to intuit text/data. Bfd provides
369 no way of figuring this out for absolute symbols. */
370 if (sym
->section
== bfd_abs_section_ptr
)
372 /* This is a hack to get the minimal symbol type
373 right for Irix 5, which has absolute addresses
374 with special section indices for dynamic symbols.
376 NOTE: uweigand-20071112: Synthetic symbols do not
377 have an ELF-private part, so do not touch those. */
378 unsigned int shndx
= type
== ST_SYNTHETIC
? 0 :
379 ((elf_symbol_type
*) sym
)->internal_elf_sym
.st_shndx
;
389 case SHN_MIPS_ACOMMON
:
396 /* If it is an Irix dynamic symbol, skip section name
397 symbols, relocate all others by section offset. */
398 if (ms_type
!= mst_abs
)
400 if (sym
->name
[0] == '.')
404 else if (sym
->section
->flags
& SEC_CODE
)
406 if (sym
->flags
& (BSF_GLOBAL
| BSF_WEAK
| BSF_GNU_UNIQUE
))
408 if (sym
->flags
& BSF_GNU_INDIRECT_FUNCTION
)
409 ms_type
= mst_text_gnu_ifunc
;
413 /* The BSF_SYNTHETIC check is there to omit ppc64 function
414 descriptors mistaken for static functions starting with 'L'.
416 else if ((sym
->name
[0] == '.' && sym
->name
[1] == 'L'
417 && (sym
->flags
& BSF_SYNTHETIC
) == 0)
418 || ((sym
->flags
& BSF_LOCAL
)
419 && sym
->name
[0] == '$'
420 && sym
->name
[1] == 'L'))
421 /* Looks like a compiler-generated label. Skip
422 it. The assembler should be skipping these (to
423 keep executables small), but apparently with
424 gcc on the (deleted) delta m88k SVR4, it loses.
425 So to have us check too should be harmless (but
426 I encourage people to fix this in the assembler
427 instead of adding checks here). */
431 ms_type
= mst_file_text
;
434 else if (sym
->section
->flags
& SEC_ALLOC
)
436 if (sym
->flags
& (BSF_GLOBAL
| BSF_WEAK
| BSF_GNU_UNIQUE
))
438 if (sym
->flags
& BSF_GNU_INDIRECT_FUNCTION
)
440 ms_type
= mst_data_gnu_ifunc
;
442 else if (sym
->section
->flags
& SEC_LOAD
)
451 else if (sym
->flags
& BSF_LOCAL
)
453 if (sym
->section
->flags
& SEC_LOAD
)
455 ms_type
= mst_file_data
;
459 ms_type
= mst_file_bss
;
464 ms_type
= mst_unknown
;
469 /* FIXME: Solaris2 shared libraries include lots of
470 odd "absolute" and "undefined" symbols, that play
471 hob with actions like finding what function the PC
472 is in. Ignore them if they aren't text, data, or bss. */
473 /* ms_type = mst_unknown; */
474 continue; /* Skip this symbol. */
476 msym
= record_minimal_symbol
477 (reader
, sym
->name
, strlen (sym
->name
), copy_names
, symaddr
,
478 ms_type
, sym
->section
, objfile
);
482 /* NOTE: uweigand-20071112: A synthetic symbol does not have an
484 if (type
!= ST_SYNTHETIC
)
486 /* Pass symbol size field in via BFD. FIXME!!! */
487 elf_symbol_type
*elf_sym
= (elf_symbol_type
*) sym
;
488 SET_MSYMBOL_SIZE (msym
, elf_sym
->internal_elf_sym
.st_size
);
491 msym
->filename
= filesymname
;
492 if (elf_make_msymbol_special_p
)
493 gdbarch_elf_make_msymbol_special (gdbarch
, sym
, msym
);
496 /* If we see a default versioned symbol, install it under
497 its version-less name. */
500 const char *atsign
= strchr (sym
->name
, '@');
502 if (atsign
!= NULL
&& atsign
[1] == '@' && atsign
> sym
->name
)
504 int len
= atsign
- sym
->name
;
506 record_minimal_symbol (reader
, sym
->name
, len
, true, symaddr
,
507 ms_type
, sym
->section
, objfile
);
511 /* For @plt symbols, also record a trampoline to the
512 destination symbol. The @plt symbol will be used in
513 disassembly, and the trampoline will be used when we are
514 trying to find the target. */
515 if (msym
&& ms_type
== mst_text
&& type
== ST_SYNTHETIC
)
517 int len
= strlen (sym
->name
);
519 if (len
> 4 && strcmp (sym
->name
+ len
- 4, "@plt") == 0)
521 struct minimal_symbol
*mtramp
;
523 mtramp
= record_minimal_symbol (reader
, sym
->name
, len
- 4,
525 mst_solib_trampoline
,
526 sym
->section
, objfile
);
529 SET_MSYMBOL_SIZE (mtramp
, MSYMBOL_SIZE (msym
));
530 mtramp
->created_by_gdb
= 1;
531 mtramp
->filename
= filesymname
;
532 if (elf_make_msymbol_special_p
)
533 gdbarch_elf_make_msymbol_special (gdbarch
,
542 /* Build minimal symbols named `function@got.plt' (see SYMBOL_GOT_PLT_SUFFIX)
543 for later look ups of which function to call when user requests
544 a STT_GNU_IFUNC function. As the STT_GNU_IFUNC type is found at the target
545 library defining `function' we cannot yet know while reading OBJFILE which
546 of the SYMBOL_GOT_PLT_SUFFIX entries will be needed and later
547 DYN_SYMBOL_TABLE is no longer easily available for OBJFILE. */
550 elf_rel_plt_read (minimal_symbol_reader
&reader
,
551 struct objfile
*objfile
, asymbol
**dyn_symbol_table
)
553 bfd
*obfd
= objfile
->obfd
;
554 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
555 asection
*relplt
, *got_plt
;
556 bfd_size_type reloc_count
, reloc
;
557 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
558 struct type
*ptr_type
= builtin_type (gdbarch
)->builtin_data_ptr
;
559 size_t ptr_size
= TYPE_LENGTH (ptr_type
);
561 if (objfile
->separate_debug_objfile_backlink
)
564 got_plt
= bfd_get_section_by_name (obfd
, ".got.plt");
567 /* For platforms where there is no separate .got.plt. */
568 got_plt
= bfd_get_section_by_name (obfd
, ".got");
573 /* Depending on system, we may find jump slots in a relocation
574 section for either .got.plt or .plt. */
575 asection
*plt
= bfd_get_section_by_name (obfd
, ".plt");
576 int plt_elf_idx
= (plt
!= NULL
) ? elf_section_data (plt
)->this_idx
: -1;
578 int got_plt_elf_idx
= elf_section_data (got_plt
)->this_idx
;
580 /* This search algorithm is from _bfd_elf_canonicalize_dynamic_reloc. */
581 for (relplt
= obfd
->sections
; relplt
!= NULL
; relplt
= relplt
->next
)
583 const auto &this_hdr
= elf_section_data (relplt
)->this_hdr
;
585 if (this_hdr
.sh_type
== SHT_REL
|| this_hdr
.sh_type
== SHT_RELA
)
587 if (this_hdr
.sh_info
== plt_elf_idx
588 || this_hdr
.sh_info
== got_plt_elf_idx
)
595 if (! bed
->s
->slurp_reloc_table (obfd
, relplt
, dyn_symbol_table
, TRUE
))
598 std::string string_buffer
;
600 /* Does ADDRESS reside in SECTION of OBFD? */
601 auto within_section
= [obfd
] (asection
*section
, CORE_ADDR address
)
606 return (bfd_section_vma (section
) <= address
607 && (address
< bfd_section_vma (section
)
608 + bfd_section_size (section
)));
611 reloc_count
= relplt
->size
/ elf_section_data (relplt
)->this_hdr
.sh_entsize
;
612 for (reloc
= 0; reloc
< reloc_count
; reloc
++)
615 struct minimal_symbol
*msym
;
617 const char *got_suffix
= SYMBOL_GOT_PLT_SUFFIX
;
618 const size_t got_suffix_len
= strlen (SYMBOL_GOT_PLT_SUFFIX
);
620 name
= bfd_asymbol_name (*relplt
->relocation
[reloc
].sym_ptr_ptr
);
621 address
= relplt
->relocation
[reloc
].address
;
623 asection
*msym_section
;
625 /* Does the pointer reside in either the .got.plt or .plt
627 if (within_section (got_plt
, address
))
628 msym_section
= got_plt
;
629 else if (within_section (plt
, address
))
634 /* We cannot check if NAME is a reference to
635 mst_text_gnu_ifunc/mst_data_gnu_ifunc as in OBJFILE the
636 symbol is undefined and the objfile having NAME defined may
637 not yet have been loaded. */
639 string_buffer
.assign (name
);
640 string_buffer
.append (got_suffix
, got_suffix
+ got_suffix_len
);
642 msym
= record_minimal_symbol (reader
, string_buffer
.c_str (),
643 string_buffer
.size (),
644 true, address
, mst_slot_got_plt
,
645 msym_section
, objfile
);
647 SET_MSYMBOL_SIZE (msym
, ptr_size
);
651 /* The data pointer is htab_t for gnu_ifunc_record_cache_unchecked. */
653 static const struct objfile_key
<htab
, htab_deleter
>
654 elf_objfile_gnu_ifunc_cache_data
;
656 /* Map function names to CORE_ADDR in elf_objfile_gnu_ifunc_cache_data. */
658 struct elf_gnu_ifunc_cache
660 /* This is always a function entry address, not a function descriptor. */
666 /* htab_hash for elf_objfile_gnu_ifunc_cache_data. */
669 elf_gnu_ifunc_cache_hash (const void *a_voidp
)
671 const struct elf_gnu_ifunc_cache
*a
672 = (const struct elf_gnu_ifunc_cache
*) a_voidp
;
674 return htab_hash_string (a
->name
);
677 /* htab_eq for elf_objfile_gnu_ifunc_cache_data. */
680 elf_gnu_ifunc_cache_eq (const void *a_voidp
, const void *b_voidp
)
682 const struct elf_gnu_ifunc_cache
*a
683 = (const struct elf_gnu_ifunc_cache
*) a_voidp
;
684 const struct elf_gnu_ifunc_cache
*b
685 = (const struct elf_gnu_ifunc_cache
*) b_voidp
;
687 return strcmp (a
->name
, b
->name
) == 0;
690 /* Record the target function address of a STT_GNU_IFUNC function NAME is the
691 function entry address ADDR. Return 1 if NAME and ADDR are considered as
692 valid and therefore they were successfully recorded, return 0 otherwise.
694 Function does not expect a duplicate entry. Use
695 elf_gnu_ifunc_resolve_by_cache first to check if the entry for NAME already
699 elf_gnu_ifunc_record_cache (const char *name
, CORE_ADDR addr
)
701 struct bound_minimal_symbol msym
;
702 struct objfile
*objfile
;
704 struct elf_gnu_ifunc_cache entry_local
, *entry_p
;
707 msym
= lookup_minimal_symbol_by_pc (addr
);
708 if (msym
.minsym
== NULL
)
710 if (BMSYMBOL_VALUE_ADDRESS (msym
) != addr
)
712 objfile
= msym
.objfile
;
714 /* If .plt jumps back to .plt the symbol is still deferred for later
715 resolution and it has no use for GDB. */
716 const char *target_name
= MSYMBOL_LINKAGE_NAME (msym
.minsym
);
717 size_t len
= strlen (target_name
);
719 /* Note we check the symbol's name instead of checking whether the
720 symbol is in the .plt section because some systems have @plt
721 symbols in the .text section. */
722 if (len
> 4 && strcmp (target_name
+ len
- 4, "@plt") == 0)
725 htab
= elf_objfile_gnu_ifunc_cache_data
.get (objfile
);
728 htab
= htab_create_alloc (1, elf_gnu_ifunc_cache_hash
,
729 elf_gnu_ifunc_cache_eq
,
730 NULL
, xcalloc
, xfree
);
731 elf_objfile_gnu_ifunc_cache_data
.set (objfile
, htab
);
734 entry_local
.addr
= addr
;
735 obstack_grow (&objfile
->objfile_obstack
, &entry_local
,
736 offsetof (struct elf_gnu_ifunc_cache
, name
));
737 obstack_grow_str0 (&objfile
->objfile_obstack
, name
);
739 = (struct elf_gnu_ifunc_cache
*) obstack_finish (&objfile
->objfile_obstack
);
741 slot
= htab_find_slot (htab
, entry_p
, INSERT
);
744 struct elf_gnu_ifunc_cache
*entry_found_p
745 = (struct elf_gnu_ifunc_cache
*) *slot
;
746 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
748 if (entry_found_p
->addr
!= addr
)
750 /* This case indicates buggy inferior program, the resolved address
751 should never change. */
753 warning (_("gnu-indirect-function \"%s\" has changed its resolved "
754 "function_address from %s to %s"),
755 name
, paddress (gdbarch
, entry_found_p
->addr
),
756 paddress (gdbarch
, addr
));
759 /* New ENTRY_P is here leaked/duplicate in the OBJFILE obstack. */
766 /* Try to find the target resolved function entry address of a STT_GNU_IFUNC
767 function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P
768 is not NULL) and the function returns 1. It returns 0 otherwise.
770 Only the elf_objfile_gnu_ifunc_cache_data hash table is searched by this
774 elf_gnu_ifunc_resolve_by_cache (const char *name
, CORE_ADDR
*addr_p
)
776 for (objfile
*objfile
: current_program_space
->objfiles ())
779 struct elf_gnu_ifunc_cache
*entry_p
;
782 htab
= elf_objfile_gnu_ifunc_cache_data
.get (objfile
);
786 entry_p
= ((struct elf_gnu_ifunc_cache
*)
787 alloca (sizeof (*entry_p
) + strlen (name
)));
788 strcpy (entry_p
->name
, name
);
790 slot
= htab_find_slot (htab
, entry_p
, NO_INSERT
);
793 entry_p
= (struct elf_gnu_ifunc_cache
*) *slot
;
794 gdb_assert (entry_p
!= NULL
);
797 *addr_p
= entry_p
->addr
;
804 /* Try to find the target resolved function entry address of a STT_GNU_IFUNC
805 function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P
806 is not NULL) and the function returns 1. It returns 0 otherwise.
808 Only the SYMBOL_GOT_PLT_SUFFIX locations are searched by this function.
809 elf_gnu_ifunc_resolve_by_cache must have been already called for NAME to
810 prevent cache entries duplicates. */
813 elf_gnu_ifunc_resolve_by_got (const char *name
, CORE_ADDR
*addr_p
)
816 const size_t got_suffix_len
= strlen (SYMBOL_GOT_PLT_SUFFIX
);
818 name_got_plt
= (char *) alloca (strlen (name
) + got_suffix_len
+ 1);
819 sprintf (name_got_plt
, "%s" SYMBOL_GOT_PLT_SUFFIX
, name
);
821 for (objfile
*objfile
: current_program_space
->objfiles ())
823 bfd
*obfd
= objfile
->obfd
;
824 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
825 struct type
*ptr_type
= builtin_type (gdbarch
)->builtin_data_ptr
;
826 size_t ptr_size
= TYPE_LENGTH (ptr_type
);
827 CORE_ADDR pointer_address
, addr
;
829 gdb_byte
*buf
= (gdb_byte
*) alloca (ptr_size
);
830 struct bound_minimal_symbol msym
;
832 msym
= lookup_minimal_symbol (name_got_plt
, NULL
, objfile
);
833 if (msym
.minsym
== NULL
)
835 if (MSYMBOL_TYPE (msym
.minsym
) != mst_slot_got_plt
)
837 pointer_address
= BMSYMBOL_VALUE_ADDRESS (msym
);
839 plt
= bfd_get_section_by_name (obfd
, ".plt");
843 if (MSYMBOL_SIZE (msym
.minsym
) != ptr_size
)
845 if (target_read_memory (pointer_address
, buf
, ptr_size
) != 0)
847 addr
= extract_typed_address (buf
, ptr_type
);
848 addr
= gdbarch_convert_from_func_ptr_addr (gdbarch
, addr
,
849 current_top_target ());
850 addr
= gdbarch_addr_bits_remove (gdbarch
, addr
);
852 if (elf_gnu_ifunc_record_cache (name
, addr
))
863 /* Try to find the target resolved function entry address of a STT_GNU_IFUNC
864 function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P
865 is not NULL) and the function returns true. It returns false otherwise.
867 Both the elf_objfile_gnu_ifunc_cache_data hash table and
868 SYMBOL_GOT_PLT_SUFFIX locations are searched by this function. */
871 elf_gnu_ifunc_resolve_name (const char *name
, CORE_ADDR
*addr_p
)
873 if (elf_gnu_ifunc_resolve_by_cache (name
, addr_p
))
876 if (elf_gnu_ifunc_resolve_by_got (name
, addr_p
))
882 /* Call STT_GNU_IFUNC - a function returning addresss of a real function to
883 call. PC is theSTT_GNU_IFUNC resolving function entry. The value returned
884 is the entry point of the resolved STT_GNU_IFUNC target function to call.
888 elf_gnu_ifunc_resolve_addr (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
890 const char *name_at_pc
;
891 CORE_ADDR start_at_pc
, address
;
892 struct type
*func_func_type
= builtin_type (gdbarch
)->builtin_func_func
;
893 struct value
*function
, *address_val
;
895 struct value
*hwcap_val
;
897 /* Try first any non-intrusive methods without an inferior call. */
899 if (find_pc_partial_function (pc
, &name_at_pc
, &start_at_pc
, NULL
)
900 && start_at_pc
== pc
)
902 if (elf_gnu_ifunc_resolve_name (name_at_pc
, &address
))
908 function
= allocate_value (func_func_type
);
909 VALUE_LVAL (function
) = lval_memory
;
910 set_value_address (function
, pc
);
912 /* STT_GNU_IFUNC resolver functions usually receive the HWCAP vector as
913 parameter. FUNCTION is the function entry address. ADDRESS may be a
914 function descriptor. */
916 target_auxv_search (current_top_target (), AT_HWCAP
, &hwcap
);
917 hwcap_val
= value_from_longest (builtin_type (gdbarch
)
918 ->builtin_unsigned_long
, hwcap
);
919 address_val
= call_function_by_hand (function
, NULL
, hwcap_val
);
920 address
= value_as_address (address_val
);
921 address
= gdbarch_convert_from_func_ptr_addr (gdbarch
, address
, current_top_target ());
922 address
= gdbarch_addr_bits_remove (gdbarch
, address
);
925 elf_gnu_ifunc_record_cache (name_at_pc
, address
);
930 /* Handle inferior hit of bp_gnu_ifunc_resolver, see its definition. */
933 elf_gnu_ifunc_resolver_stop (struct breakpoint
*b
)
935 struct breakpoint
*b_return
;
936 struct frame_info
*prev_frame
= get_prev_frame (get_current_frame ());
937 struct frame_id prev_frame_id
= get_stack_frame_id (prev_frame
);
938 CORE_ADDR prev_pc
= get_frame_pc (prev_frame
);
939 int thread_id
= inferior_thread ()->global_num
;
941 gdb_assert (b
->type
== bp_gnu_ifunc_resolver
);
943 for (b_return
= b
->related_breakpoint
; b_return
!= b
;
944 b_return
= b_return
->related_breakpoint
)
946 gdb_assert (b_return
->type
== bp_gnu_ifunc_resolver_return
);
947 gdb_assert (b_return
->loc
!= NULL
&& b_return
->loc
->next
== NULL
);
948 gdb_assert (frame_id_p (b_return
->frame_id
));
950 if (b_return
->thread
== thread_id
951 && b_return
->loc
->requested_address
== prev_pc
952 && frame_id_eq (b_return
->frame_id
, prev_frame_id
))
958 /* No need to call find_pc_line for symbols resolving as this is only
959 a helper breakpointer never shown to the user. */
962 sal
.pspace
= current_inferior ()->pspace
;
964 sal
.section
= find_pc_overlay (sal
.pc
);
967 = set_momentary_breakpoint (get_frame_arch (prev_frame
), sal
,
969 bp_gnu_ifunc_resolver_return
).release ();
971 /* set_momentary_breakpoint invalidates PREV_FRAME. */
974 /* Add new b_return to the ring list b->related_breakpoint. */
975 gdb_assert (b_return
->related_breakpoint
== b_return
);
976 b_return
->related_breakpoint
= b
->related_breakpoint
;
977 b
->related_breakpoint
= b_return
;
981 /* Handle inferior hit of bp_gnu_ifunc_resolver_return, see its definition. */
984 elf_gnu_ifunc_resolver_return_stop (struct breakpoint
*b
)
986 thread_info
*thread
= inferior_thread ();
987 struct gdbarch
*gdbarch
= get_frame_arch (get_current_frame ());
988 struct type
*func_func_type
= builtin_type (gdbarch
)->builtin_func_func
;
989 struct type
*value_type
= TYPE_TARGET_TYPE (func_func_type
);
990 struct regcache
*regcache
= get_thread_regcache (thread
);
991 struct value
*func_func
;
993 CORE_ADDR resolved_address
, resolved_pc
;
995 gdb_assert (b
->type
== bp_gnu_ifunc_resolver_return
);
997 while (b
->related_breakpoint
!= b
)
999 struct breakpoint
*b_next
= b
->related_breakpoint
;
1003 case bp_gnu_ifunc_resolver
:
1005 case bp_gnu_ifunc_resolver_return
:
1006 delete_breakpoint (b
);
1009 internal_error (__FILE__
, __LINE__
,
1010 _("handle_inferior_event: Invalid "
1011 "gnu-indirect-function breakpoint type %d"),
1016 gdb_assert (b
->type
== bp_gnu_ifunc_resolver
);
1017 gdb_assert (b
->loc
->next
== NULL
);
1019 func_func
= allocate_value (func_func_type
);
1020 VALUE_LVAL (func_func
) = lval_memory
;
1021 set_value_address (func_func
, b
->loc
->related_address
);
1023 value
= allocate_value (value_type
);
1024 gdbarch_return_value (gdbarch
, func_func
, value_type
, regcache
,
1025 value_contents_raw (value
), NULL
);
1026 resolved_address
= value_as_address (value
);
1027 resolved_pc
= gdbarch_convert_from_func_ptr_addr (gdbarch
,
1029 current_top_target ());
1030 resolved_pc
= gdbarch_addr_bits_remove (gdbarch
, resolved_pc
);
1032 gdb_assert (current_program_space
== b
->pspace
|| b
->pspace
== NULL
);
1033 elf_gnu_ifunc_record_cache (event_location_to_string (b
->location
.get ()),
1036 b
->type
= bp_breakpoint
;
1037 update_breakpoint_locations (b
, current_program_space
,
1038 find_function_start_sal (resolved_pc
, NULL
, true),
1042 /* A helper function for elf_symfile_read that reads the minimal
1046 elf_read_minimal_symbols (struct objfile
*objfile
, int symfile_flags
,
1047 const struct elfinfo
*ei
)
1049 bfd
*synth_abfd
, *abfd
= objfile
->obfd
;
1050 long symcount
= 0, dynsymcount
= 0, synthcount
, storage_needed
;
1051 asymbol
**symbol_table
= NULL
, **dyn_symbol_table
= NULL
;
1054 if (symtab_create_debug
)
1056 fprintf_unfiltered (gdb_stdlog
,
1057 "Reading minimal symbols of objfile %s ...\n",
1058 objfile_name (objfile
));
1061 /* If we already have minsyms, then we can skip some work here.
1062 However, if there were stabs or mdebug sections, we go ahead and
1063 redo all the work anyway, because the psym readers for those
1064 kinds of debuginfo need extra information found here. This can
1065 go away once all types of symbols are in the per-BFD object. */
1066 if (objfile
->per_bfd
->minsyms_read
1067 && ei
->stabsect
== NULL
1068 && ei
->mdebugsect
== NULL
1069 && ei
->ctfsect
== NULL
)
1071 if (symtab_create_debug
)
1072 fprintf_unfiltered (gdb_stdlog
,
1073 "... minimal symbols previously read\n");
1077 minimal_symbol_reader
reader (objfile
);
1079 /* Process the normal ELF symbol table first. */
1081 storage_needed
= bfd_get_symtab_upper_bound (objfile
->obfd
);
1082 if (storage_needed
< 0)
1083 error (_("Can't read symbols from %s: %s"),
1084 bfd_get_filename (objfile
->obfd
),
1085 bfd_errmsg (bfd_get_error ()));
1087 if (storage_needed
> 0)
1089 /* Memory gets permanently referenced from ABFD after
1090 bfd_canonicalize_symtab so it must not get freed before ABFD gets. */
1092 symbol_table
= (asymbol
**) bfd_alloc (abfd
, storage_needed
);
1093 symcount
= bfd_canonicalize_symtab (objfile
->obfd
, symbol_table
);
1096 error (_("Can't read symbols from %s: %s"),
1097 bfd_get_filename (objfile
->obfd
),
1098 bfd_errmsg (bfd_get_error ()));
1100 elf_symtab_read (reader
, objfile
, ST_REGULAR
, symcount
, symbol_table
,
1104 /* Add the dynamic symbols. */
1106 storage_needed
= bfd_get_dynamic_symtab_upper_bound (objfile
->obfd
);
1108 if (storage_needed
> 0)
1110 /* Memory gets permanently referenced from ABFD after
1111 bfd_get_synthetic_symtab so it must not get freed before ABFD gets.
1112 It happens only in the case when elf_slurp_reloc_table sees
1113 asection->relocation NULL. Determining which section is asection is
1114 done by _bfd_elf_get_synthetic_symtab which is all a bfd
1115 implementation detail, though. */
1117 dyn_symbol_table
= (asymbol
**) bfd_alloc (abfd
, storage_needed
);
1118 dynsymcount
= bfd_canonicalize_dynamic_symtab (objfile
->obfd
,
1121 if (dynsymcount
< 0)
1122 error (_("Can't read symbols from %s: %s"),
1123 bfd_get_filename (objfile
->obfd
),
1124 bfd_errmsg (bfd_get_error ()));
1126 elf_symtab_read (reader
, objfile
, ST_DYNAMIC
, dynsymcount
,
1127 dyn_symbol_table
, false);
1129 elf_rel_plt_read (reader
, objfile
, dyn_symbol_table
);
1132 /* Contrary to binutils --strip-debug/--only-keep-debug the strip command from
1133 elfutils (eu-strip) moves even the .symtab section into the .debug file.
1135 bfd_get_synthetic_symtab on ppc64 for each function descriptor ELF symbol
1136 'name' creates a new BSF_SYNTHETIC ELF symbol '.name' with its code
1137 address. But with eu-strip files bfd_get_synthetic_symtab would fail to
1138 read the code address from .opd while it reads the .symtab section from
1139 a separate debug info file as the .opd section is SHT_NOBITS there.
1141 With SYNTH_ABFD the .opd section will be read from the original
1142 backlinked binary where it is valid. */
1144 if (objfile
->separate_debug_objfile_backlink
)
1145 synth_abfd
= objfile
->separate_debug_objfile_backlink
->obfd
;
1149 /* Add synthetic symbols - for instance, names for any PLT entries. */
1151 synthcount
= bfd_get_synthetic_symtab (synth_abfd
, symcount
, symbol_table
,
1152 dynsymcount
, dyn_symbol_table
,
1158 std::unique_ptr
<asymbol
*[]>
1159 synth_symbol_table (new asymbol
*[synthcount
]);
1160 for (i
= 0; i
< synthcount
; i
++)
1161 synth_symbol_table
[i
] = synthsyms
+ i
;
1162 elf_symtab_read (reader
, objfile
, ST_SYNTHETIC
, synthcount
,
1163 synth_symbol_table
.get (), true);
1169 /* Install any minimal symbols that have been collected as the current
1170 minimal symbols for this objfile. The debug readers below this point
1171 should not generate new minimal symbols; if they do it's their
1172 responsibility to install them. "mdebug" appears to be the only one
1173 which will do this. */
1177 if (symtab_create_debug
)
1178 fprintf_unfiltered (gdb_stdlog
, "Done reading minimal symbols.\n");
1181 /* Scan and build partial symbols for a symbol file.
1182 We have been initialized by a call to elf_symfile_init, which
1183 currently does nothing.
1185 This function only does the minimum work necessary for letting the
1186 user "name" things symbolically; it does not read the entire symtab.
1187 Instead, it reads the external and static symbols and puts them in partial
1188 symbol tables. When more extensive information is requested of a
1189 file, the corresponding partial symbol table is mutated into a full
1190 fledged symbol table by going back and reading the symbols
1193 We look for sections with specific names, to tell us what debug
1194 format to look for: FIXME!!!
1196 elfstab_build_psymtabs() handles STABS symbols;
1197 mdebug_build_psymtabs() handles ECOFF debugging information.
1199 Note that ELF files have a "minimal" symbol table, which looks a lot
1200 like a COFF symbol table, but has only the minimal information necessary
1201 for linking. We process this also, and use the information to
1202 build gdb's minimal symbol table. This gives us some minimal debugging
1203 capability even for files compiled without -g. */
1206 elf_symfile_read (struct objfile
*objfile
, symfile_add_flags symfile_flags
)
1208 bfd
*abfd
= objfile
->obfd
;
1210 bool has_dwarf2
= true;
1212 memset ((char *) &ei
, 0, sizeof (ei
));
1213 if (!(objfile
->flags
& OBJF_READNEVER
))
1214 bfd_map_over_sections (abfd
, elf_locate_sections
, (void *) & ei
);
1216 elf_read_minimal_symbols (objfile
, symfile_flags
, &ei
);
1218 /* ELF debugging information is inserted into the psymtab in the
1219 order of least informative first - most informative last. Since
1220 the psymtab table is searched `most recent insertion first' this
1221 increases the probability that more detailed debug information
1222 for a section is found.
1224 For instance, an object file might contain both .mdebug (XCOFF)
1225 and .debug_info (DWARF2) sections then .mdebug is inserted first
1226 (searched last) and DWARF2 is inserted last (searched first). If
1227 we don't do this then the XCOFF info is found first - for code in
1228 an included file XCOFF info is useless. */
1232 const struct ecoff_debug_swap
*swap
;
1234 /* .mdebug section, presumably holding ECOFF debugging
1236 swap
= get_elf_backend_data (abfd
)->elf_backend_ecoff_debug_swap
;
1238 elfmdebug_build_psymtabs (objfile
, swap
, ei
.mdebugsect
);
1244 /* Stab sections have an associated string table that looks like
1245 a separate section. */
1246 str_sect
= bfd_get_section_by_name (abfd
, ".stabstr");
1248 /* FIXME should probably warn about a stab section without a stabstr. */
1250 elfstab_build_psymtabs (objfile
,
1253 bfd_section_size (str_sect
));
1256 if (dwarf2_has_info (objfile
, NULL
, true))
1258 dw_index_kind index_kind
;
1260 /* elf_sym_fns_gdb_index cannot handle simultaneous non-DWARF
1261 debug information present in OBJFILE. If there is such debug
1262 info present never use an index. */
1263 if (!objfile_has_partial_symbols (objfile
)
1264 && dwarf2_initialize_objfile (objfile
, &index_kind
))
1268 case dw_index_kind::GDB_INDEX
:
1269 objfile_set_sym_fns (objfile
, &elf_sym_fns_gdb_index
);
1271 case dw_index_kind::DEBUG_NAMES
:
1272 objfile_set_sym_fns (objfile
, &elf_sym_fns_debug_names
);
1278 /* It is ok to do this even if the stabs reader made some
1279 partial symbols, because OBJF_PSYMTABS_READ has not been
1280 set, and so our lazy reader function will still be called
1282 objfile_set_sym_fns (objfile
, &elf_sym_fns_lazy_psyms
);
1285 /* If the file has its own symbol tables it has no separate debug
1286 info. `.dynsym'/`.symtab' go to MSYMBOLS, `.debug_info' goes to
1287 SYMTABS/PSYMTABS. `.gnu_debuglink' may no longer be present with
1288 `.note.gnu.build-id'.
1290 .gnu_debugdata is !objfile_has_partial_symbols because it contains only
1291 .symtab, not .debug_* section. But if we already added .gnu_debugdata as
1292 an objfile via find_separate_debug_file_in_section there was no separate
1293 debug info available. Therefore do not attempt to search for another one,
1294 objfile->separate_debug_objfile->separate_debug_objfile GDB guarantees to
1295 be NULL and we would possibly violate it. */
1297 else if (!objfile_has_partial_symbols (objfile
)
1298 && objfile
->separate_debug_objfile
== NULL
1299 && objfile
->separate_debug_objfile_backlink
== NULL
)
1301 std::string debugfile
= find_separate_debug_file_by_buildid (objfile
);
1303 if (debugfile
.empty ())
1304 debugfile
= find_separate_debug_file_by_debuglink (objfile
);
1306 if (!debugfile
.empty ())
1308 gdb_bfd_ref_ptr
debug_bfd (symfile_bfd_open (debugfile
.c_str ()));
1310 symbol_file_add_separate (debug_bfd
.get (), debugfile
.c_str (),
1311 symfile_flags
, objfile
);
1317 /* Read the CTF section only if there is no DWARF info. */
1318 if (!has_dwarf2
&& ei
.ctfsect
)
1320 elfctf_build_psymtabs (objfile
);
1324 /* Callback to lazily read psymtabs. */
1327 read_psyms (struct objfile
*objfile
)
1329 if (dwarf2_has_info (objfile
, NULL
))
1330 dwarf2_build_psymtabs (objfile
);
1333 /* Initialize anything that needs initializing when a completely new symbol
1334 file is specified (not just adding some symbols from another file, e.g. a
1338 elf_new_init (struct objfile
*ignore
)
1342 /* Perform any local cleanups required when we are done with a particular
1343 objfile. I.E, we are in the process of discarding all symbol information
1344 for an objfile, freeing up all memory held for it, and unlinking the
1345 objfile struct from the global list of known objfiles. */
1348 elf_symfile_finish (struct objfile
*objfile
)
1352 /* ELF specific initialization routine for reading symbols. */
1355 elf_symfile_init (struct objfile
*objfile
)
1357 /* ELF objects may be reordered, so set OBJF_REORDERED. If we
1358 find this causes a significant slowdown in gdb then we could
1359 set it in the debug symbol readers only when necessary. */
1360 objfile
->flags
|= OBJF_REORDERED
;
1363 /* Implementation of `sym_get_probes', as documented in symfile.h. */
1365 static const elfread_data
&
1366 elf_get_probes (struct objfile
*objfile
)
1368 elfread_data
*probes_per_bfd
= probe_key
.get (objfile
->obfd
);
1370 if (probes_per_bfd
== NULL
)
1372 probes_per_bfd
= probe_key
.emplace (objfile
->obfd
);
1374 /* Here we try to gather information about all types of probes from the
1376 for (const static_probe_ops
*ops
: all_static_probe_ops
)
1377 ops
->get_probes (probes_per_bfd
, objfile
);
1380 return *probes_per_bfd
;
1385 /* Implementation `sym_probe_fns', as documented in symfile.h. */
1387 static const struct sym_probe_fns elf_probe_fns
=
1389 elf_get_probes
, /* sym_get_probes */
1392 /* Register that we are able to handle ELF object file formats. */
1394 static const struct sym_fns elf_sym_fns
=
1396 elf_new_init
, /* init anything gbl to entire symtab */
1397 elf_symfile_init
, /* read initial info, setup for sym_read() */
1398 elf_symfile_read
, /* read a symbol file into symtab */
1399 NULL
, /* sym_read_psymbols */
1400 elf_symfile_finish
, /* finished with file, cleanup */
1401 default_symfile_offsets
, /* Translate ext. to int. relocation */
1402 elf_symfile_segments
, /* Get segment information from a file. */
1404 default_symfile_relocate
, /* Relocate a debug section. */
1405 &elf_probe_fns
, /* sym_probe_fns */
1409 /* The same as elf_sym_fns, but not registered and lazily reads
1412 const struct sym_fns elf_sym_fns_lazy_psyms
=
1414 elf_new_init
, /* init anything gbl to entire symtab */
1415 elf_symfile_init
, /* read initial info, setup for sym_read() */
1416 elf_symfile_read
, /* read a symbol file into symtab */
1417 read_psyms
, /* sym_read_psymbols */
1418 elf_symfile_finish
, /* finished with file, cleanup */
1419 default_symfile_offsets
, /* Translate ext. to int. relocation */
1420 elf_symfile_segments
, /* Get segment information from a file. */
1422 default_symfile_relocate
, /* Relocate a debug section. */
1423 &elf_probe_fns
, /* sym_probe_fns */
1427 /* The same as elf_sym_fns, but not registered and uses the
1428 DWARF-specific GNU index rather than psymtab. */
1429 const struct sym_fns elf_sym_fns_gdb_index
=
1431 elf_new_init
, /* init anything gbl to entire symab */
1432 elf_symfile_init
, /* read initial info, setup for sym_red() */
1433 elf_symfile_read
, /* read a symbol file into symtab */
1434 NULL
, /* sym_read_psymbols */
1435 elf_symfile_finish
, /* finished with file, cleanup */
1436 default_symfile_offsets
, /* Translate ext. to int. relocatin */
1437 elf_symfile_segments
, /* Get segment information from a file. */
1439 default_symfile_relocate
, /* Relocate a debug section. */
1440 &elf_probe_fns
, /* sym_probe_fns */
1441 &dwarf2_gdb_index_functions
1444 /* The same as elf_sym_fns, but not registered and uses the
1445 DWARF-specific .debug_names index rather than psymtab. */
1446 const struct sym_fns elf_sym_fns_debug_names
=
1448 elf_new_init
, /* init anything gbl to entire symab */
1449 elf_symfile_init
, /* read initial info, setup for sym_red() */
1450 elf_symfile_read
, /* read a symbol file into symtab */
1451 NULL
, /* sym_read_psymbols */
1452 elf_symfile_finish
, /* finished with file, cleanup */
1453 default_symfile_offsets
, /* Translate ext. to int. relocatin */
1454 elf_symfile_segments
, /* Get segment information from a file. */
1456 default_symfile_relocate
, /* Relocate a debug section. */
1457 &elf_probe_fns
, /* sym_probe_fns */
1458 &dwarf2_debug_names_functions
1461 /* STT_GNU_IFUNC resolver vector to be installed to gnu_ifunc_fns_p. */
1463 static const struct gnu_ifunc_fns elf_gnu_ifunc_fns
=
1465 elf_gnu_ifunc_resolve_addr
,
1466 elf_gnu_ifunc_resolve_name
,
1467 elf_gnu_ifunc_resolver_stop
,
1468 elf_gnu_ifunc_resolver_return_stop
1472 _initialize_elfread (void)
1474 add_symtab_fns (bfd_target_elf_flavour
, &elf_sym_fns
);
1476 gnu_ifunc_fns_p
= &elf_gnu_ifunc_fns
;