1 /* Read ELF (Executable and Linking Format) object files for GDB.
3 Copyright (C) 1991-2018 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_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 /* Per-BFD data for probe info. */
68 static const struct bfd_data
*probe_key
= NULL
;
70 /* Minimal symbols located at the GOT entries for .plt - that is the real
71 pointer where the given entry will jump to. It gets updated by the real
72 function address during lazy ld.so resolving in the inferior. These
73 minimal symbols are indexed for <tab>-completion. */
75 #define SYMBOL_GOT_PLT_SUFFIX "@got.plt"
77 /* Locate the segments in ABFD. */
79 static struct symfile_segment_data
*
80 elf_symfile_segments (bfd
*abfd
)
82 Elf_Internal_Phdr
*phdrs
, **segments
;
84 int num_phdrs
, num_segments
, num_sections
, i
;
86 struct symfile_segment_data
*data
;
88 phdrs_size
= bfd_get_elf_phdr_upper_bound (abfd
);
92 phdrs
= (Elf_Internal_Phdr
*) alloca (phdrs_size
);
93 num_phdrs
= bfd_get_elf_phdrs (abfd
, phdrs
);
98 segments
= XALLOCAVEC (Elf_Internal_Phdr
*, num_phdrs
);
99 for (i
= 0; i
< num_phdrs
; i
++)
100 if (phdrs
[i
].p_type
== PT_LOAD
)
101 segments
[num_segments
++] = &phdrs
[i
];
103 if (num_segments
== 0)
106 data
= XCNEW (struct symfile_segment_data
);
107 data
->num_segments
= num_segments
;
108 data
->segment_bases
= XCNEWVEC (CORE_ADDR
, num_segments
);
109 data
->segment_sizes
= XCNEWVEC (CORE_ADDR
, num_segments
);
111 for (i
= 0; i
< num_segments
; i
++)
113 data
->segment_bases
[i
] = segments
[i
]->p_vaddr
;
114 data
->segment_sizes
[i
] = segments
[i
]->p_memsz
;
117 num_sections
= bfd_count_sections (abfd
);
118 data
->segment_info
= XCNEWVEC (int, num_sections
);
120 for (i
= 0, sect
= abfd
->sections
; sect
!= NULL
; i
++, sect
= sect
->next
)
125 if ((bfd_get_section_flags (abfd
, sect
) & SEC_ALLOC
) == 0)
128 vma
= bfd_get_section_vma (abfd
, sect
);
130 for (j
= 0; j
< num_segments
; j
++)
131 if (segments
[j
]->p_memsz
> 0
132 && vma
>= segments
[j
]->p_vaddr
133 && (vma
- segments
[j
]->p_vaddr
) < segments
[j
]->p_memsz
)
135 data
->segment_info
[i
] = j
+ 1;
139 /* We should have found a segment for every non-empty section.
140 If we haven't, we will not relocate this section by any
141 offsets we apply to the segments. As an exception, do not
142 warn about SHT_NOBITS sections; in normal ELF execution
143 environments, SHT_NOBITS means zero-initialized and belongs
144 in a segment, but in no-OS environments some tools (e.g. ARM
145 RealView) use SHT_NOBITS for uninitialized data. Since it is
146 uninitialized, it doesn't need a program header. Such
147 binaries are not relocatable. */
148 if (bfd_get_section_size (sect
) > 0 && j
== num_segments
149 && (bfd_get_section_flags (abfd
, sect
) & SEC_LOAD
) != 0)
150 warning (_("Loadable section \"%s\" outside of ELF segments"),
151 bfd_section_name (abfd
, sect
));
157 /* We are called once per section from elf_symfile_read. We
158 need to examine each section we are passed, check to see
159 if it is something we are interested in processing, and
160 if so, stash away some access information for the section.
162 For now we recognize the dwarf debug information sections and
163 line number sections from matching their section names. The
164 ELF definition is no real help here since it has no direct
165 knowledge of DWARF (by design, so any debugging format can be
168 We also recognize the ".stab" sections used by the Sun compilers
169 released with Solaris 2.
171 FIXME: The section names should not be hardwired strings (what
172 should they be? I don't think most object file formats have enough
173 section flags to specify what kind of debug section it is.
177 elf_locate_sections (bfd
*ignore_abfd
, asection
*sectp
, void *eip
)
181 ei
= (struct elfinfo
*) eip
;
182 if (strcmp (sectp
->name
, ".stab") == 0)
184 ei
->stabsect
= sectp
;
186 else if (strcmp (sectp
->name
, ".mdebug") == 0)
188 ei
->mdebugsect
= sectp
;
192 static struct minimal_symbol
*
193 record_minimal_symbol (minimal_symbol_reader
&reader
,
194 const char *name
, int name_len
, bool copy_name
,
196 enum minimal_symbol_type ms_type
,
197 asection
*bfd_section
, struct objfile
*objfile
)
199 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
201 if (ms_type
== mst_text
|| ms_type
== mst_file_text
202 || ms_type
== mst_text_gnu_ifunc
)
203 address
= gdbarch_addr_bits_remove (gdbarch
, address
);
205 return reader
.record_full (name
, name_len
, copy_name
, address
,
207 gdb_bfd_section_index (objfile
->obfd
,
211 /* Read the symbol table of an ELF file.
213 Given an objfile, a symbol table, and a flag indicating whether the
214 symbol table contains regular, dynamic, or synthetic symbols, add all
215 the global function and data symbols to the minimal symbol table.
217 In stabs-in-ELF, as implemented by Sun, there are some local symbols
218 defined in the ELF symbol table, which can be used to locate
219 the beginnings of sections from each ".o" file that was linked to
220 form the executable objfile. We gather any such info and record it
221 in data structures hung off the objfile's private data. */
225 #define ST_SYNTHETIC 2
228 elf_symtab_read (minimal_symbol_reader
&reader
,
229 struct objfile
*objfile
, int type
,
230 long number_of_symbols
, asymbol
**symbol_table
,
233 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
237 enum minimal_symbol_type ms_type
;
238 /* Name of the last file symbol. This is either a constant string or is
239 saved on the objfile's filename cache. */
240 const char *filesymname
= "";
241 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
*relplt
, *got_plt
;
539 bfd_size_type reloc_count
, reloc
;
540 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
541 struct type
*ptr_type
= builtin_type (gdbarch
)->builtin_data_ptr
;
542 size_t ptr_size
= TYPE_LENGTH (ptr_type
);
544 if (objfile
->separate_debug_objfile_backlink
)
547 got_plt
= bfd_get_section_by_name (obfd
, ".got.plt");
550 /* For platforms where there is no separate .got.plt. */
551 got_plt
= bfd_get_section_by_name (obfd
, ".got");
556 /* Depending on system, we may find jump slots in a relocation
557 section for either .got.plt or .plt. */
558 asection
*plt
= bfd_get_section_by_name (obfd
, ".plt");
559 int plt_elf_idx
= (plt
!= NULL
) ? elf_section_data (plt
)->this_idx
: -1;
561 int got_plt_elf_idx
= elf_section_data (got_plt
)->this_idx
;
563 /* This search algorithm is from _bfd_elf_canonicalize_dynamic_reloc. */
564 for (relplt
= obfd
->sections
; relplt
!= NULL
; relplt
= relplt
->next
)
566 const auto &this_hdr
= elf_section_data (relplt
)->this_hdr
;
568 if (this_hdr
.sh_type
== SHT_REL
|| this_hdr
.sh_type
== SHT_RELA
)
570 if (this_hdr
.sh_info
== plt_elf_idx
571 || this_hdr
.sh_info
== got_plt_elf_idx
)
578 if (! bed
->s
->slurp_reloc_table (obfd
, relplt
, dyn_symbol_table
, TRUE
))
581 std::string string_buffer
;
583 /* Does ADDRESS reside in SECTION of OBFD? */
584 auto within_section
= [obfd
] (asection
*section
, CORE_ADDR address
)
589 return (bfd_get_section_vma (obfd
, section
) <= address
590 && (address
< bfd_get_section_vma (obfd
, section
)
591 + bfd_get_section_size (section
)));
594 reloc_count
= relplt
->size
/ elf_section_data (relplt
)->this_hdr
.sh_entsize
;
595 for (reloc
= 0; reloc
< reloc_count
; reloc
++)
598 struct minimal_symbol
*msym
;
600 const char *got_suffix
= SYMBOL_GOT_PLT_SUFFIX
;
601 const size_t got_suffix_len
= strlen (SYMBOL_GOT_PLT_SUFFIX
);
603 name
= bfd_asymbol_name (*relplt
->relocation
[reloc
].sym_ptr_ptr
);
604 address
= relplt
->relocation
[reloc
].address
;
606 asection
*msym_section
;
608 /* Does the pointer reside in either the .got.plt or .plt
610 if (within_section (got_plt
, address
))
611 msym_section
= got_plt
;
612 else if (within_section (plt
, address
))
617 /* We cannot check if NAME is a reference to mst_text_gnu_ifunc as in
618 OBJFILE the symbol is undefined and the objfile having NAME defined
619 may not yet have been loaded. */
621 string_buffer
.assign (name
);
622 string_buffer
.append (got_suffix
, got_suffix
+ got_suffix_len
);
624 msym
= record_minimal_symbol (reader
, string_buffer
.c_str (),
625 string_buffer
.size (),
626 true, address
, mst_slot_got_plt
,
627 msym_section
, objfile
);
629 SET_MSYMBOL_SIZE (msym
, ptr_size
);
633 /* The data pointer is htab_t for gnu_ifunc_record_cache_unchecked. */
635 static const struct objfile_data
*elf_objfile_gnu_ifunc_cache_data
;
637 /* Map function names to CORE_ADDR in elf_objfile_gnu_ifunc_cache_data. */
639 struct elf_gnu_ifunc_cache
641 /* This is always a function entry address, not a function descriptor. */
647 /* htab_hash for elf_objfile_gnu_ifunc_cache_data. */
650 elf_gnu_ifunc_cache_hash (const void *a_voidp
)
652 const struct elf_gnu_ifunc_cache
*a
653 = (const struct elf_gnu_ifunc_cache
*) a_voidp
;
655 return htab_hash_string (a
->name
);
658 /* htab_eq for elf_objfile_gnu_ifunc_cache_data. */
661 elf_gnu_ifunc_cache_eq (const void *a_voidp
, const void *b_voidp
)
663 const struct elf_gnu_ifunc_cache
*a
664 = (const struct elf_gnu_ifunc_cache
*) a_voidp
;
665 const struct elf_gnu_ifunc_cache
*b
666 = (const struct elf_gnu_ifunc_cache
*) b_voidp
;
668 return strcmp (a
->name
, b
->name
) == 0;
671 /* Record the target function address of a STT_GNU_IFUNC function NAME is the
672 function entry address ADDR. Return 1 if NAME and ADDR are considered as
673 valid and therefore they were successfully recorded, return 0 otherwise.
675 Function does not expect a duplicate entry. Use
676 elf_gnu_ifunc_resolve_by_cache first to check if the entry for NAME already
680 elf_gnu_ifunc_record_cache (const char *name
, CORE_ADDR addr
)
682 struct bound_minimal_symbol msym
;
683 struct objfile
*objfile
;
685 struct elf_gnu_ifunc_cache entry_local
, *entry_p
;
688 msym
= lookup_minimal_symbol_by_pc (addr
);
689 if (msym
.minsym
== NULL
)
691 if (BMSYMBOL_VALUE_ADDRESS (msym
) != addr
)
693 objfile
= msym
.objfile
;
695 /* If .plt jumps back to .plt the symbol is still deferred for later
696 resolution and it has no use for GDB. */
697 const char *target_name
= MSYMBOL_LINKAGE_NAME (msym
.minsym
);
698 size_t len
= strlen (target_name
);
700 /* Note we check the symbol's name instead of checking whether the
701 symbol is in the .plt section because some systems have @plt
702 symbols in the .text section. */
703 if (len
> 4 && strcmp (target_name
+ len
- 4, "@plt") == 0)
706 htab
= (htab_t
) objfile_data (objfile
, elf_objfile_gnu_ifunc_cache_data
);
709 htab
= htab_create_alloc_ex (1, elf_gnu_ifunc_cache_hash
,
710 elf_gnu_ifunc_cache_eq
,
711 NULL
, &objfile
->objfile_obstack
,
712 hashtab_obstack_allocate
,
713 dummy_obstack_deallocate
);
714 set_objfile_data (objfile
, elf_objfile_gnu_ifunc_cache_data
, htab
);
717 entry_local
.addr
= addr
;
718 obstack_grow (&objfile
->objfile_obstack
, &entry_local
,
719 offsetof (struct elf_gnu_ifunc_cache
, name
));
720 obstack_grow_str0 (&objfile
->objfile_obstack
, name
);
722 = (struct elf_gnu_ifunc_cache
*) obstack_finish (&objfile
->objfile_obstack
);
724 slot
= htab_find_slot (htab
, entry_p
, INSERT
);
727 struct elf_gnu_ifunc_cache
*entry_found_p
728 = (struct elf_gnu_ifunc_cache
*) *slot
;
729 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
731 if (entry_found_p
->addr
!= addr
)
733 /* This case indicates buggy inferior program, the resolved address
734 should never change. */
736 warning (_("gnu-indirect-function \"%s\" has changed its resolved "
737 "function_address from %s to %s"),
738 name
, paddress (gdbarch
, entry_found_p
->addr
),
739 paddress (gdbarch
, addr
));
742 /* New ENTRY_P is here leaked/duplicate in the OBJFILE obstack. */
749 /* Try to find the target resolved function entry address of a STT_GNU_IFUNC
750 function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P
751 is not NULL) and the function returns 1. It returns 0 otherwise.
753 Only the elf_objfile_gnu_ifunc_cache_data hash table is searched by this
757 elf_gnu_ifunc_resolve_by_cache (const char *name
, CORE_ADDR
*addr_p
)
759 struct objfile
*objfile
;
761 ALL_PSPACE_OBJFILES (current_program_space
, objfile
)
764 struct elf_gnu_ifunc_cache
*entry_p
;
767 htab
= (htab_t
) objfile_data (objfile
, elf_objfile_gnu_ifunc_cache_data
);
771 entry_p
= ((struct elf_gnu_ifunc_cache
*)
772 alloca (sizeof (*entry_p
) + strlen (name
)));
773 strcpy (entry_p
->name
, name
);
775 slot
= htab_find_slot (htab
, entry_p
, NO_INSERT
);
778 entry_p
= (struct elf_gnu_ifunc_cache
*) *slot
;
779 gdb_assert (entry_p
!= NULL
);
782 *addr_p
= entry_p
->addr
;
789 /* Try to find the target resolved function entry address of a STT_GNU_IFUNC
790 function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P
791 is not NULL) and the function returns 1. It returns 0 otherwise.
793 Only the SYMBOL_GOT_PLT_SUFFIX locations are searched by this function.
794 elf_gnu_ifunc_resolve_by_cache must have been already called for NAME to
795 prevent cache entries duplicates. */
798 elf_gnu_ifunc_resolve_by_got (const char *name
, CORE_ADDR
*addr_p
)
801 struct objfile
*objfile
;
802 const size_t got_suffix_len
= strlen (SYMBOL_GOT_PLT_SUFFIX
);
804 name_got_plt
= (char *) alloca (strlen (name
) + got_suffix_len
+ 1);
805 sprintf (name_got_plt
, "%s" SYMBOL_GOT_PLT_SUFFIX
, name
);
807 ALL_PSPACE_OBJFILES (current_program_space
, objfile
)
809 bfd
*obfd
= objfile
->obfd
;
810 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
811 struct type
*ptr_type
= builtin_type (gdbarch
)->builtin_data_ptr
;
812 size_t ptr_size
= TYPE_LENGTH (ptr_type
);
813 CORE_ADDR pointer_address
, addr
;
815 gdb_byte
*buf
= (gdb_byte
*) alloca (ptr_size
);
816 struct bound_minimal_symbol msym
;
818 msym
= lookup_minimal_symbol (name_got_plt
, NULL
, objfile
);
819 if (msym
.minsym
== NULL
)
821 if (MSYMBOL_TYPE (msym
.minsym
) != mst_slot_got_plt
)
823 pointer_address
= BMSYMBOL_VALUE_ADDRESS (msym
);
825 plt
= bfd_get_section_by_name (obfd
, ".plt");
829 if (MSYMBOL_SIZE (msym
.minsym
) != ptr_size
)
831 if (target_read_memory (pointer_address
, buf
, ptr_size
) != 0)
833 addr
= extract_typed_address (buf
, ptr_type
);
834 addr
= gdbarch_convert_from_func_ptr_addr (gdbarch
, addr
,
836 addr
= gdbarch_addr_bits_remove (gdbarch
, addr
);
838 if (elf_gnu_ifunc_record_cache (name
, addr
))
849 /* Try to find the target resolved function entry address of a STT_GNU_IFUNC
850 function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P
851 is not NULL) and the function returns 1. It returns 0 otherwise.
853 Both the elf_objfile_gnu_ifunc_cache_data hash table and
854 SYMBOL_GOT_PLT_SUFFIX locations are searched by this function. */
857 elf_gnu_ifunc_resolve_name (const char *name
, CORE_ADDR
*addr_p
)
859 if (elf_gnu_ifunc_resolve_by_cache (name
, addr_p
))
862 if (elf_gnu_ifunc_resolve_by_got (name
, addr_p
))
868 /* Call STT_GNU_IFUNC - a function returning addresss of a real function to
869 call. PC is theSTT_GNU_IFUNC resolving function entry. The value returned
870 is the entry point of the resolved STT_GNU_IFUNC target function to call.
874 elf_gnu_ifunc_resolve_addr (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
876 const char *name_at_pc
;
877 CORE_ADDR start_at_pc
, address
;
878 struct type
*func_func_type
= builtin_type (gdbarch
)->builtin_func_func
;
879 struct value
*function
, *address_val
;
881 struct value
*hwcap_val
;
883 /* Try first any non-intrusive methods without an inferior call. */
885 if (find_pc_partial_function (pc
, &name_at_pc
, &start_at_pc
, NULL
)
886 && start_at_pc
== pc
)
888 if (elf_gnu_ifunc_resolve_name (name_at_pc
, &address
))
894 function
= allocate_value (func_func_type
);
895 VALUE_LVAL (function
) = lval_memory
;
896 set_value_address (function
, pc
);
898 /* STT_GNU_IFUNC resolver functions usually receive the HWCAP vector as
899 parameter. FUNCTION is the function entry address. ADDRESS may be a
900 function descriptor. */
902 target_auxv_search (¤t_target
, AT_HWCAP
, &hwcap
);
903 hwcap_val
= value_from_longest (builtin_type (gdbarch
)
904 ->builtin_unsigned_long
, hwcap
);
905 address_val
= call_function_by_hand (function
, NULL
, 1, &hwcap_val
);
906 address
= value_as_address (address_val
);
907 address
= gdbarch_convert_from_func_ptr_addr (gdbarch
, address
,
909 address
= gdbarch_addr_bits_remove (gdbarch
, address
);
912 elf_gnu_ifunc_record_cache (name_at_pc
, address
);
917 /* Handle inferior hit of bp_gnu_ifunc_resolver, see its definition. */
920 elf_gnu_ifunc_resolver_stop (struct breakpoint
*b
)
922 struct breakpoint
*b_return
;
923 struct frame_info
*prev_frame
= get_prev_frame (get_current_frame ());
924 struct frame_id prev_frame_id
= get_stack_frame_id (prev_frame
);
925 CORE_ADDR prev_pc
= get_frame_pc (prev_frame
);
926 int thread_id
= ptid_to_global_thread_id (inferior_ptid
);
928 gdb_assert (b
->type
== bp_gnu_ifunc_resolver
);
930 for (b_return
= b
->related_breakpoint
; b_return
!= b
;
931 b_return
= b_return
->related_breakpoint
)
933 gdb_assert (b_return
->type
== bp_gnu_ifunc_resolver_return
);
934 gdb_assert (b_return
->loc
!= NULL
&& b_return
->loc
->next
== NULL
);
935 gdb_assert (frame_id_p (b_return
->frame_id
));
937 if (b_return
->thread
== thread_id
938 && b_return
->loc
->requested_address
== prev_pc
939 && frame_id_eq (b_return
->frame_id
, prev_frame_id
))
945 /* No need to call find_pc_line for symbols resolving as this is only
946 a helper breakpointer never shown to the user. */
949 sal
.pspace
= current_inferior ()->pspace
;
951 sal
.section
= find_pc_overlay (sal
.pc
);
954 = set_momentary_breakpoint (get_frame_arch (prev_frame
), sal
,
956 bp_gnu_ifunc_resolver_return
).release ();
958 /* set_momentary_breakpoint invalidates PREV_FRAME. */
961 /* Add new b_return to the ring list b->related_breakpoint. */
962 gdb_assert (b_return
->related_breakpoint
== b_return
);
963 b_return
->related_breakpoint
= b
->related_breakpoint
;
964 b
->related_breakpoint
= b_return
;
968 /* Handle inferior hit of bp_gnu_ifunc_resolver_return, see its definition. */
971 elf_gnu_ifunc_resolver_return_stop (struct breakpoint
*b
)
973 struct gdbarch
*gdbarch
= get_frame_arch (get_current_frame ());
974 struct type
*func_func_type
= builtin_type (gdbarch
)->builtin_func_func
;
975 struct type
*value_type
= TYPE_TARGET_TYPE (func_func_type
);
976 struct regcache
*regcache
= get_thread_regcache (inferior_ptid
);
977 struct value
*func_func
;
979 CORE_ADDR resolved_address
, resolved_pc
;
981 gdb_assert (b
->type
== bp_gnu_ifunc_resolver_return
);
983 while (b
->related_breakpoint
!= b
)
985 struct breakpoint
*b_next
= b
->related_breakpoint
;
989 case bp_gnu_ifunc_resolver
:
991 case bp_gnu_ifunc_resolver_return
:
992 delete_breakpoint (b
);
995 internal_error (__FILE__
, __LINE__
,
996 _("handle_inferior_event: Invalid "
997 "gnu-indirect-function breakpoint type %d"),
1002 gdb_assert (b
->type
== bp_gnu_ifunc_resolver
);
1003 gdb_assert (b
->loc
->next
== NULL
);
1005 func_func
= allocate_value (func_func_type
);
1006 VALUE_LVAL (func_func
) = lval_memory
;
1007 set_value_address (func_func
, b
->loc
->related_address
);
1009 value
= allocate_value (value_type
);
1010 gdbarch_return_value (gdbarch
, func_func
, value_type
, regcache
,
1011 value_contents_raw (value
), NULL
);
1012 resolved_address
= value_as_address (value
);
1013 resolved_pc
= gdbarch_convert_from_func_ptr_addr (gdbarch
,
1016 resolved_pc
= gdbarch_addr_bits_remove (gdbarch
, resolved_pc
);
1018 gdb_assert (current_program_space
== b
->pspace
|| b
->pspace
== NULL
);
1019 elf_gnu_ifunc_record_cache (event_location_to_string (b
->location
.get ()),
1022 b
->type
= bp_breakpoint
;
1023 update_breakpoint_locations (b
, current_program_space
,
1024 find_pc_line (resolved_pc
, 0), {});
1027 /* A helper function for elf_symfile_read that reads the minimal
1031 elf_read_minimal_symbols (struct objfile
*objfile
, int symfile_flags
,
1032 const struct elfinfo
*ei
)
1034 bfd
*synth_abfd
, *abfd
= objfile
->obfd
;
1035 long symcount
= 0, dynsymcount
= 0, synthcount
, storage_needed
;
1036 asymbol
**symbol_table
= NULL
, **dyn_symbol_table
= NULL
;
1038 struct dbx_symfile_info
*dbx
;
1040 if (symtab_create_debug
)
1042 fprintf_unfiltered (gdb_stdlog
,
1043 "Reading minimal symbols of objfile %s ...\n",
1044 objfile_name (objfile
));
1047 /* If we already have minsyms, then we can skip some work here.
1048 However, if there were stabs or mdebug sections, we go ahead and
1049 redo all the work anyway, because the psym readers for those
1050 kinds of debuginfo need extra information found here. This can
1051 go away once all types of symbols are in the per-BFD object. */
1052 if (objfile
->per_bfd
->minsyms_read
1053 && ei
->stabsect
== NULL
1054 && ei
->mdebugsect
== NULL
)
1056 if (symtab_create_debug
)
1057 fprintf_unfiltered (gdb_stdlog
,
1058 "... minimal symbols previously read\n");
1062 minimal_symbol_reader
reader (objfile
);
1064 /* Allocate struct to keep track of the symfile. */
1065 dbx
= XCNEW (struct dbx_symfile_info
);
1066 set_objfile_data (objfile
, dbx_objfile_data_key
, dbx
);
1068 /* Process the normal ELF symbol table first. */
1070 storage_needed
= bfd_get_symtab_upper_bound (objfile
->obfd
);
1071 if (storage_needed
< 0)
1072 error (_("Can't read symbols from %s: %s"),
1073 bfd_get_filename (objfile
->obfd
),
1074 bfd_errmsg (bfd_get_error ()));
1076 if (storage_needed
> 0)
1078 /* Memory gets permanently referenced from ABFD after
1079 bfd_canonicalize_symtab so it must not get freed before ABFD gets. */
1081 symbol_table
= (asymbol
**) bfd_alloc (abfd
, storage_needed
);
1082 symcount
= bfd_canonicalize_symtab (objfile
->obfd
, symbol_table
);
1085 error (_("Can't read symbols from %s: %s"),
1086 bfd_get_filename (objfile
->obfd
),
1087 bfd_errmsg (bfd_get_error ()));
1089 elf_symtab_read (reader
, objfile
, ST_REGULAR
, symcount
, symbol_table
,
1093 /* Add the dynamic symbols. */
1095 storage_needed
= bfd_get_dynamic_symtab_upper_bound (objfile
->obfd
);
1097 if (storage_needed
> 0)
1099 /* Memory gets permanently referenced from ABFD after
1100 bfd_get_synthetic_symtab so it must not get freed before ABFD gets.
1101 It happens only in the case when elf_slurp_reloc_table sees
1102 asection->relocation NULL. Determining which section is asection is
1103 done by _bfd_elf_get_synthetic_symtab which is all a bfd
1104 implementation detail, though. */
1106 dyn_symbol_table
= (asymbol
**) bfd_alloc (abfd
, storage_needed
);
1107 dynsymcount
= bfd_canonicalize_dynamic_symtab (objfile
->obfd
,
1110 if (dynsymcount
< 0)
1111 error (_("Can't read symbols from %s: %s"),
1112 bfd_get_filename (objfile
->obfd
),
1113 bfd_errmsg (bfd_get_error ()));
1115 elf_symtab_read (reader
, objfile
, ST_DYNAMIC
, dynsymcount
,
1116 dyn_symbol_table
, false);
1118 elf_rel_plt_read (reader
, objfile
, dyn_symbol_table
);
1121 /* Contrary to binutils --strip-debug/--only-keep-debug the strip command from
1122 elfutils (eu-strip) moves even the .symtab section into the .debug file.
1124 bfd_get_synthetic_symtab on ppc64 for each function descriptor ELF symbol
1125 'name' creates a new BSF_SYNTHETIC ELF symbol '.name' with its code
1126 address. But with eu-strip files bfd_get_synthetic_symtab would fail to
1127 read the code address from .opd while it reads the .symtab section from
1128 a separate debug info file as the .opd section is SHT_NOBITS there.
1130 With SYNTH_ABFD the .opd section will be read from the original
1131 backlinked binary where it is valid. */
1133 if (objfile
->separate_debug_objfile_backlink
)
1134 synth_abfd
= objfile
->separate_debug_objfile_backlink
->obfd
;
1138 /* Add synthetic symbols - for instance, names for any PLT entries. */
1140 synthcount
= bfd_get_synthetic_symtab (synth_abfd
, symcount
, symbol_table
,
1141 dynsymcount
, dyn_symbol_table
,
1147 std::unique_ptr
<asymbol
*[]>
1148 synth_symbol_table (new asymbol
*[synthcount
]);
1149 for (i
= 0; i
< synthcount
; i
++)
1150 synth_symbol_table
[i
] = synthsyms
+ i
;
1151 elf_symtab_read (reader
, objfile
, ST_SYNTHETIC
, synthcount
,
1152 synth_symbol_table
.get (), true);
1158 /* Install any minimal symbols that have been collected as the current
1159 minimal symbols for this objfile. The debug readers below this point
1160 should not generate new minimal symbols; if they do it's their
1161 responsibility to install them. "mdebug" appears to be the only one
1162 which will do this. */
1166 if (symtab_create_debug
)
1167 fprintf_unfiltered (gdb_stdlog
, "Done reading minimal symbols.\n");
1170 /* Scan and build partial symbols for a symbol file.
1171 We have been initialized by a call to elf_symfile_init, which
1172 currently does nothing.
1174 This function only does the minimum work necessary for letting the
1175 user "name" things symbolically; it does not read the entire symtab.
1176 Instead, it reads the external and static symbols and puts them in partial
1177 symbol tables. When more extensive information is requested of a
1178 file, the corresponding partial symbol table is mutated into a full
1179 fledged symbol table by going back and reading the symbols
1182 We look for sections with specific names, to tell us what debug
1183 format to look for: FIXME!!!
1185 elfstab_build_psymtabs() handles STABS symbols;
1186 mdebug_build_psymtabs() handles ECOFF debugging information.
1188 Note that ELF files have a "minimal" symbol table, which looks a lot
1189 like a COFF symbol table, but has only the minimal information necessary
1190 for linking. We process this also, and use the information to
1191 build gdb's minimal symbol table. This gives us some minimal debugging
1192 capability even for files compiled without -g. */
1195 elf_symfile_read (struct objfile
*objfile
, symfile_add_flags symfile_flags
)
1197 bfd
*abfd
= objfile
->obfd
;
1200 memset ((char *) &ei
, 0, sizeof (ei
));
1201 if (!(objfile
->flags
& OBJF_READNEVER
))
1202 bfd_map_over_sections (abfd
, elf_locate_sections
, (void *) & ei
);
1204 elf_read_minimal_symbols (objfile
, symfile_flags
, &ei
);
1206 /* ELF debugging information is inserted into the psymtab in the
1207 order of least informative first - most informative last. Since
1208 the psymtab table is searched `most recent insertion first' this
1209 increases the probability that more detailed debug information
1210 for a section is found.
1212 For instance, an object file might contain both .mdebug (XCOFF)
1213 and .debug_info (DWARF2) sections then .mdebug is inserted first
1214 (searched last) and DWARF2 is inserted last (searched first). If
1215 we don't do this then the XCOFF info is found first - for code in
1216 an included file XCOFF info is useless. */
1220 const struct ecoff_debug_swap
*swap
;
1222 /* .mdebug section, presumably holding ECOFF debugging
1224 swap
= get_elf_backend_data (abfd
)->elf_backend_ecoff_debug_swap
;
1226 elfmdebug_build_psymtabs (objfile
, swap
, ei
.mdebugsect
);
1232 /* Stab sections have an associated string table that looks like
1233 a separate section. */
1234 str_sect
= bfd_get_section_by_name (abfd
, ".stabstr");
1236 /* FIXME should probably warn about a stab section without a stabstr. */
1238 elfstab_build_psymtabs (objfile
,
1241 bfd_section_size (abfd
, str_sect
));
1244 if (dwarf2_has_info (objfile
, NULL
))
1246 dw_index_kind index_kind
;
1248 /* elf_sym_fns_gdb_index cannot handle simultaneous non-DWARF
1249 debug information present in OBJFILE. If there is such debug
1250 info present never use an index. */
1251 if (!objfile_has_partial_symbols (objfile
)
1252 && dwarf2_initialize_objfile (objfile
, &index_kind
))
1256 case dw_index_kind::GDB_INDEX
:
1257 objfile_set_sym_fns (objfile
, &elf_sym_fns_gdb_index
);
1259 case dw_index_kind::DEBUG_NAMES
:
1260 objfile_set_sym_fns (objfile
, &elf_sym_fns_debug_names
);
1266 /* It is ok to do this even if the stabs reader made some
1267 partial symbols, because OBJF_PSYMTABS_READ has not been
1268 set, and so our lazy reader function will still be called
1270 objfile_set_sym_fns (objfile
, &elf_sym_fns_lazy_psyms
);
1273 /* If the file has its own symbol tables it has no separate debug
1274 info. `.dynsym'/`.symtab' go to MSYMBOLS, `.debug_info' goes to
1275 SYMTABS/PSYMTABS. `.gnu_debuglink' may no longer be present with
1276 `.note.gnu.build-id'.
1278 .gnu_debugdata is !objfile_has_partial_symbols because it contains only
1279 .symtab, not .debug_* section. But if we already added .gnu_debugdata as
1280 an objfile via find_separate_debug_file_in_section there was no separate
1281 debug info available. Therefore do not attempt to search for another one,
1282 objfile->separate_debug_objfile->separate_debug_objfile GDB guarantees to
1283 be NULL and we would possibly violate it. */
1285 else if (!objfile_has_partial_symbols (objfile
)
1286 && objfile
->separate_debug_objfile
== NULL
1287 && objfile
->separate_debug_objfile_backlink
== NULL
)
1289 std::string debugfile
= find_separate_debug_file_by_buildid (objfile
);
1291 if (debugfile
.empty ())
1292 debugfile
= find_separate_debug_file_by_debuglink (objfile
);
1294 if (!debugfile
.empty ())
1296 gdb_bfd_ref_ptr
abfd (symfile_bfd_open (debugfile
.c_str ()));
1298 symbol_file_add_separate (abfd
.get (), debugfile
.c_str (),
1299 symfile_flags
, objfile
);
1304 /* Callback to lazily read psymtabs. */
1307 read_psyms (struct objfile
*objfile
)
1309 if (dwarf2_has_info (objfile
, NULL
))
1310 dwarf2_build_psymtabs (objfile
);
1313 /* Initialize anything that needs initializing when a completely new symbol
1314 file is specified (not just adding some symbols from another file, e.g. a
1317 We reinitialize buildsym, since we may be reading stabs from an ELF
1321 elf_new_init (struct objfile
*ignore
)
1323 stabsread_new_init ();
1324 buildsym_new_init ();
1327 /* Perform any local cleanups required when we are done with a particular
1328 objfile. I.E, we are in the process of discarding all symbol information
1329 for an objfile, freeing up all memory held for it, and unlinking the
1330 objfile struct from the global list of known objfiles. */
1333 elf_symfile_finish (struct objfile
*objfile
)
1335 dwarf2_free_objfile (objfile
);
1338 /* ELF specific initialization routine for reading symbols. */
1341 elf_symfile_init (struct objfile
*objfile
)
1343 /* ELF objects may be reordered, so set OBJF_REORDERED. If we
1344 find this causes a significant slowdown in gdb then we could
1345 set it in the debug symbol readers only when necessary. */
1346 objfile
->flags
|= OBJF_REORDERED
;
1349 /* Implementation of `sym_get_probes', as documented in symfile.h. */
1351 static const std::vector
<probe
*> &
1352 elf_get_probes (struct objfile
*objfile
)
1354 std::vector
<probe
*> *probes_per_bfd
;
1356 /* Have we parsed this objfile's probes already? */
1357 probes_per_bfd
= (std::vector
<probe
*> *) bfd_data (objfile
->obfd
, probe_key
);
1359 if (probes_per_bfd
== NULL
)
1361 probes_per_bfd
= new std::vector
<probe
*>;
1363 /* Here we try to gather information about all types of probes from the
1365 for (const static_probe_ops
*ops
: all_static_probe_ops
)
1366 ops
->get_probes (probes_per_bfd
, objfile
);
1368 set_bfd_data (objfile
->obfd
, probe_key
, probes_per_bfd
);
1371 return *probes_per_bfd
;
1374 /* Helper function used to free the space allocated for storing SystemTap
1375 probe information. */
1378 probe_key_free (bfd
*abfd
, void *d
)
1380 std::vector
<probe
*> *probes
= (std::vector
<probe
*> *) d
;
1382 for (probe
*p
: *probes
)
1390 /* Implementation `sym_probe_fns', as documented in symfile.h. */
1392 static const struct sym_probe_fns elf_probe_fns
=
1394 elf_get_probes
, /* sym_get_probes */
1397 /* Register that we are able to handle ELF object file formats. */
1399 static const struct sym_fns elf_sym_fns
=
1401 elf_new_init
, /* init anything gbl to entire symtab */
1402 elf_symfile_init
, /* read initial info, setup for sym_read() */
1403 elf_symfile_read
, /* read a symbol file into symtab */
1404 NULL
, /* sym_read_psymbols */
1405 elf_symfile_finish
, /* finished with file, cleanup */
1406 default_symfile_offsets
, /* Translate ext. to int. relocation */
1407 elf_symfile_segments
, /* Get segment information from a file. */
1409 default_symfile_relocate
, /* Relocate a debug section. */
1410 &elf_probe_fns
, /* sym_probe_fns */
1414 /* The same as elf_sym_fns, but not registered and lazily reads
1417 const struct sym_fns elf_sym_fns_lazy_psyms
=
1419 elf_new_init
, /* init anything gbl to entire symtab */
1420 elf_symfile_init
, /* read initial info, setup for sym_read() */
1421 elf_symfile_read
, /* read a symbol file into symtab */
1422 read_psyms
, /* sym_read_psymbols */
1423 elf_symfile_finish
, /* finished with file, cleanup */
1424 default_symfile_offsets
, /* Translate ext. to int. relocation */
1425 elf_symfile_segments
, /* Get segment information from a file. */
1427 default_symfile_relocate
, /* Relocate a debug section. */
1428 &elf_probe_fns
, /* sym_probe_fns */
1432 /* The same as elf_sym_fns, but not registered and uses the
1433 DWARF-specific GNU index rather than psymtab. */
1434 const struct sym_fns elf_sym_fns_gdb_index
=
1436 elf_new_init
, /* init anything gbl to entire symab */
1437 elf_symfile_init
, /* read initial info, setup for sym_red() */
1438 elf_symfile_read
, /* read a symbol file into symtab */
1439 NULL
, /* sym_read_psymbols */
1440 elf_symfile_finish
, /* finished with file, cleanup */
1441 default_symfile_offsets
, /* Translate ext. to int. relocatin */
1442 elf_symfile_segments
, /* Get segment information from a file. */
1444 default_symfile_relocate
, /* Relocate a debug section. */
1445 &elf_probe_fns
, /* sym_probe_fns */
1446 &dwarf2_gdb_index_functions
1449 /* The same as elf_sym_fns, but not registered and uses the
1450 DWARF-specific .debug_names index rather than psymtab. */
1451 const struct sym_fns elf_sym_fns_debug_names
=
1453 elf_new_init
, /* init anything gbl to entire symab */
1454 elf_symfile_init
, /* read initial info, setup for sym_red() */
1455 elf_symfile_read
, /* read a symbol file into symtab */
1456 NULL
, /* sym_read_psymbols */
1457 elf_symfile_finish
, /* finished with file, cleanup */
1458 default_symfile_offsets
, /* Translate ext. to int. relocatin */
1459 elf_symfile_segments
, /* Get segment information from a file. */
1461 default_symfile_relocate
, /* Relocate a debug section. */
1462 &elf_probe_fns
, /* sym_probe_fns */
1463 &dwarf2_debug_names_functions
1466 /* STT_GNU_IFUNC resolver vector to be installed to gnu_ifunc_fns_p. */
1468 static const struct gnu_ifunc_fns elf_gnu_ifunc_fns
=
1470 elf_gnu_ifunc_resolve_addr
,
1471 elf_gnu_ifunc_resolve_name
,
1472 elf_gnu_ifunc_resolver_stop
,
1473 elf_gnu_ifunc_resolver_return_stop
1477 _initialize_elfread (void)
1479 probe_key
= register_bfd_data_with_cleanup (NULL
, probe_key_free
);
1480 add_symtab_fns (bfd_target_elf_flavour
, &elf_sym_fns
);
1482 elf_objfile_gnu_ifunc_cache_data
= register_objfile_data ();
1483 gnu_ifunc_fns_p
= &elf_gnu_ifunc_fns
;