1 /* ELF executable support for BFD.
2 Copyright (C) 1991-2020 Free Software Foundation, Inc.
4 Written by Fred Fish @ Cygnus Support, from information published
5 in "UNIX System V Release 4, Programmers Guide: ANSI C and
6 Programming Support Tools". Sufficient support for gdb.
8 Rewritten by Mark Eichin @ Cygnus Support, from information
9 published in "System V Application Binary Interface", chapters 4
10 and 5, as well as the various "Processor Supplement" documents
11 derived from it. Added support for assembler and other object file
12 utilities. Further work done by Ken Raeburn (Cygnus Support), Michael
13 Meissner (Open Software Foundation), and Peter Hoogenboom (University
14 of Utah) to finish and extend this.
16 This file is part of BFD, the Binary File Descriptor library.
18 This program is free software; you can redistribute it and/or modify
19 it under the terms of the GNU General Public License as published by
20 the Free Software Foundation; either version 3 of the License, or
21 (at your option) any later version.
23 This program is distributed in the hope that it will be useful,
24 but WITHOUT ANY WARRANTY; without even the implied warranty of
25 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 GNU General Public License for more details.
28 You should have received a copy of the GNU General Public License
29 along with this program; if not, write to the Free Software
30 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
31 MA 02110-1301, USA. */
34 /* Problems and other issues to resolve.
36 (1) BFD expects there to be some fixed number of "sections" in
37 the object file. I.E. there is a "section_count" variable in the
38 bfd structure which contains the number of sections. However, ELF
39 supports multiple "views" of a file. In particular, with current
40 implementations, executable files typically have two tables, a
41 program header table and a section header table, both of which
42 partition the executable.
44 In ELF-speak, the "linking view" of the file uses the section header
45 table to access "sections" within the file, and the "execution view"
46 uses the program header table to access "segments" within the file.
47 "Segments" typically may contain all the data from one or more
50 Note that the section header table is optional in ELF executables,
51 but it is this information that is most useful to gdb. If the
52 section header table is missing, then gdb should probably try
53 to make do with the program header table. (FIXME)
55 (2) The code in this file is compiled twice, once in 32-bit mode and
56 once in 64-bit mode. More of it should be made size-independent
59 (3) ELF section symbols are handled rather sloppily now. This should
60 be cleaned up, and ELF section symbols reconciled with BFD section
63 (4) We need a published spec for 64-bit ELF. We've got some stuff here
64 that we're using for SPARC V9 64-bit chips, but don't assume that
70 #include "libiberty.h"
74 #include "libiberty.h"
76 /* Renaming structures, typedefs, macros and functions to be size-specific. */
77 #define Elf_External_Ehdr NAME(Elf,External_Ehdr)
78 #define Elf_External_Sym NAME(Elf,External_Sym)
79 #define Elf_External_Shdr NAME(Elf,External_Shdr)
80 #define Elf_External_Phdr NAME(Elf,External_Phdr)
81 #define Elf_External_Rel NAME(Elf,External_Rel)
82 #define Elf_External_Rela NAME(Elf,External_Rela)
83 #define Elf_External_Dyn NAME(Elf,External_Dyn)
85 #define elf_core_file_failing_command NAME(bfd_elf,core_file_failing_command)
86 #define elf_core_file_failing_signal NAME(bfd_elf,core_file_failing_signal)
87 #define elf_core_file_matches_executable_p \
88 NAME(bfd_elf,core_file_matches_executable_p)
89 #define elf_core_file_pid NAME(bfd_elf,core_file_pid)
90 #define elf_object_p NAME(bfd_elf,object_p)
91 #define elf_core_file_p NAME(bfd_elf,core_file_p)
92 #define elf_get_symtab_upper_bound NAME(bfd_elf,get_symtab_upper_bound)
93 #define elf_get_dynamic_symtab_upper_bound \
94 NAME(bfd_elf,get_dynamic_symtab_upper_bound)
95 #define elf_swap_reloc_in NAME(bfd_elf,swap_reloc_in)
96 #define elf_swap_reloca_in NAME(bfd_elf,swap_reloca_in)
97 #define elf_swap_reloc_out NAME(bfd_elf,swap_reloc_out)
98 #define elf_swap_reloca_out NAME(bfd_elf,swap_reloca_out)
99 #define elf_swap_symbol_in NAME(bfd_elf,swap_symbol_in)
100 #define elf_swap_symbol_out NAME(bfd_elf,swap_symbol_out)
101 #define elf_swap_phdr_in NAME(bfd_elf,swap_phdr_in)
102 #define elf_swap_phdr_out NAME(bfd_elf,swap_phdr_out)
103 #define elf_swap_dyn_in NAME(bfd_elf,swap_dyn_in)
104 #define elf_swap_dyn_out NAME(bfd_elf,swap_dyn_out)
105 #define elf_get_reloc_upper_bound NAME(bfd_elf,get_reloc_upper_bound)
106 #define elf_canonicalize_reloc NAME(bfd_elf,canonicalize_reloc)
107 #define elf_slurp_symbol_table NAME(bfd_elf,slurp_symbol_table)
108 #define elf_canonicalize_symtab NAME(bfd_elf,canonicalize_symtab)
109 #define elf_canonicalize_dynamic_symtab \
110 NAME(bfd_elf,canonicalize_dynamic_symtab)
111 #define elf_get_synthetic_symtab \
112 NAME(bfd_elf,get_synthetic_symtab)
113 #define elf_make_empty_symbol NAME(bfd_elf,make_empty_symbol)
114 #define elf_get_symbol_info NAME(bfd_elf,get_symbol_info)
115 #define elf_get_lineno NAME(bfd_elf,get_lineno)
116 #define elf_set_arch_mach NAME(bfd_elf,set_arch_mach)
117 #define elf_find_nearest_line NAME(bfd_elf,find_nearest_line)
118 #define elf_sizeof_headers NAME(bfd_elf,sizeof_headers)
119 #define elf_set_section_contents NAME(bfd_elf,set_section_contents)
120 #define elf_no_info_to_howto NAME(bfd_elf,no_info_to_howto)
121 #define elf_no_info_to_howto_rel NAME(bfd_elf,no_info_to_howto_rel)
122 #define elf_find_section NAME(bfd_elf,find_section)
123 #define elf_write_shdrs_and_ehdr NAME(bfd_elf,write_shdrs_and_ehdr)
124 #define elf_write_out_phdrs NAME(bfd_elf,write_out_phdrs)
125 #define elf_checksum_contents NAME(bfd_elf,checksum_contents)
126 #define elf_write_relocs NAME(bfd_elf,write_relocs)
127 #define elf_slurp_reloc_table NAME(bfd_elf,slurp_reloc_table)
130 #define ELF_R_INFO(X,Y) ELF64_R_INFO(X,Y)
131 #define ELF_R_SYM(X) ELF64_R_SYM(X)
132 #define ELF_R_TYPE(X) ELF64_R_TYPE(X)
133 #define ELFCLASS ELFCLASS64
135 #define LOG_FILE_ALIGN 3
138 #define ELF_R_INFO(X,Y) ELF32_R_INFO(X,Y)
139 #define ELF_R_SYM(X) ELF32_R_SYM(X)
140 #define ELF_R_TYPE(X) ELF32_R_TYPE(X)
141 #define ELFCLASS ELFCLASS32
143 #define LOG_FILE_ALIGN 2
147 static void elf_debug_section (int, Elf_Internal_Shdr
*);
150 static void elf_debug_file (Elf_Internal_Ehdr
*);
153 /* Structure swapping routines */
155 /* Should perhaps use put_offset, put_word, etc. For now, the two versions
156 can be handled by explicitly specifying 32 bits or "the long type". */
158 #define H_PUT_WORD H_PUT_64
159 #define H_PUT_SIGNED_WORD H_PUT_S64
160 #define H_GET_WORD H_GET_64
161 #define H_GET_SIGNED_WORD H_GET_S64
164 #define H_PUT_WORD H_PUT_32
165 #define H_PUT_SIGNED_WORD H_PUT_S32
166 #define H_GET_WORD H_GET_32
167 #define H_GET_SIGNED_WORD H_GET_S32
170 /* Translate an ELF symbol in external format into an ELF symbol in internal
174 elf_swap_symbol_in (bfd
*abfd
,
177 Elf_Internal_Sym
*dst
)
179 const Elf_External_Sym
*src
= (const Elf_External_Sym
*) psrc
;
180 const Elf_External_Sym_Shndx
*shndx
= (const Elf_External_Sym_Shndx
*) pshn
;
181 int signed_vma
= get_elf_backend_data (abfd
)->sign_extend_vma
;
183 dst
->st_name
= H_GET_32 (abfd
, src
->st_name
);
185 dst
->st_value
= H_GET_SIGNED_WORD (abfd
, src
->st_value
);
187 dst
->st_value
= H_GET_WORD (abfd
, src
->st_value
);
188 dst
->st_size
= H_GET_WORD (abfd
, src
->st_size
);
189 dst
->st_info
= H_GET_8 (abfd
, src
->st_info
);
190 dst
->st_other
= H_GET_8 (abfd
, src
->st_other
);
191 dst
->st_shndx
= H_GET_16 (abfd
, src
->st_shndx
);
192 if (dst
->st_shndx
== (SHN_XINDEX
& 0xffff))
196 dst
->st_shndx
= H_GET_32 (abfd
, shndx
->est_shndx
);
198 else if (dst
->st_shndx
>= (SHN_LORESERVE
& 0xffff))
199 dst
->st_shndx
+= SHN_LORESERVE
- (SHN_LORESERVE
& 0xffff);
200 dst
->st_target_internal
= 0;
204 /* Translate an ELF symbol in internal format into an ELF symbol in external
208 elf_swap_symbol_out (bfd
*abfd
,
209 const Elf_Internal_Sym
*src
,
214 Elf_External_Sym
*dst
= (Elf_External_Sym
*) cdst
;
215 H_PUT_32 (abfd
, src
->st_name
, dst
->st_name
);
216 H_PUT_WORD (abfd
, src
->st_value
, dst
->st_value
);
217 H_PUT_WORD (abfd
, src
->st_size
, dst
->st_size
);
218 H_PUT_8 (abfd
, src
->st_info
, dst
->st_info
);
219 H_PUT_8 (abfd
, src
->st_other
, dst
->st_other
);
221 if (tmp
>= (SHN_LORESERVE
& 0xffff) && tmp
< SHN_LORESERVE
)
225 H_PUT_32 (abfd
, tmp
, shndx
);
226 tmp
= SHN_XINDEX
& 0xffff;
228 H_PUT_16 (abfd
, tmp
, dst
->st_shndx
);
231 /* Translate an ELF file header in external format into an ELF file header in
235 elf_swap_ehdr_in (bfd
*abfd
,
236 const Elf_External_Ehdr
*src
,
237 Elf_Internal_Ehdr
*dst
)
239 int signed_vma
= get_elf_backend_data (abfd
)->sign_extend_vma
;
240 memcpy (dst
->e_ident
, src
->e_ident
, EI_NIDENT
);
241 dst
->e_type
= H_GET_16 (abfd
, src
->e_type
);
242 dst
->e_machine
= H_GET_16 (abfd
, src
->e_machine
);
243 dst
->e_version
= H_GET_32 (abfd
, src
->e_version
);
245 dst
->e_entry
= H_GET_SIGNED_WORD (abfd
, src
->e_entry
);
247 dst
->e_entry
= H_GET_WORD (abfd
, src
->e_entry
);
248 dst
->e_phoff
= H_GET_WORD (abfd
, src
->e_phoff
);
249 dst
->e_shoff
= H_GET_WORD (abfd
, src
->e_shoff
);
250 dst
->e_flags
= H_GET_32 (abfd
, src
->e_flags
);
251 dst
->e_ehsize
= H_GET_16 (abfd
, src
->e_ehsize
);
252 dst
->e_phentsize
= H_GET_16 (abfd
, src
->e_phentsize
);
253 dst
->e_phnum
= H_GET_16 (abfd
, src
->e_phnum
);
254 dst
->e_shentsize
= H_GET_16 (abfd
, src
->e_shentsize
);
255 dst
->e_shnum
= H_GET_16 (abfd
, src
->e_shnum
);
256 dst
->e_shstrndx
= H_GET_16 (abfd
, src
->e_shstrndx
);
259 /* Translate an ELF file header in internal format into an ELF file header in
263 elf_swap_ehdr_out (bfd
*abfd
,
264 const Elf_Internal_Ehdr
*src
,
265 Elf_External_Ehdr
*dst
)
268 int signed_vma
= get_elf_backend_data (abfd
)->sign_extend_vma
;
269 memcpy (dst
->e_ident
, src
->e_ident
, EI_NIDENT
);
270 /* note that all elements of dst are *arrays of unsigned char* already... */
271 H_PUT_16 (abfd
, src
->e_type
, dst
->e_type
);
272 H_PUT_16 (abfd
, src
->e_machine
, dst
->e_machine
);
273 H_PUT_32 (abfd
, src
->e_version
, dst
->e_version
);
275 H_PUT_SIGNED_WORD (abfd
, src
->e_entry
, dst
->e_entry
);
277 H_PUT_WORD (abfd
, src
->e_entry
, dst
->e_entry
);
278 H_PUT_WORD (abfd
, src
->e_phoff
, dst
->e_phoff
);
279 H_PUT_WORD (abfd
, src
->e_shoff
, dst
->e_shoff
);
280 H_PUT_32 (abfd
, src
->e_flags
, dst
->e_flags
);
281 H_PUT_16 (abfd
, src
->e_ehsize
, dst
->e_ehsize
);
282 H_PUT_16 (abfd
, src
->e_phentsize
, dst
->e_phentsize
);
286 H_PUT_16 (abfd
, tmp
, dst
->e_phnum
);
287 H_PUT_16 (abfd
, src
->e_shentsize
, dst
->e_shentsize
);
289 if (tmp
>= (SHN_LORESERVE
& 0xffff))
291 H_PUT_16 (abfd
, tmp
, dst
->e_shnum
);
292 tmp
= src
->e_shstrndx
;
293 if (tmp
>= (SHN_LORESERVE
& 0xffff))
294 tmp
= SHN_XINDEX
& 0xffff;
295 H_PUT_16 (abfd
, tmp
, dst
->e_shstrndx
);
298 /* Translate an ELF section header table entry in external format into an
299 ELF section header table entry in internal format. */
302 elf_swap_shdr_in (bfd
*abfd
,
303 const Elf_External_Shdr
*src
,
304 Elf_Internal_Shdr
*dst
)
306 int signed_vma
= get_elf_backend_data (abfd
)->sign_extend_vma
;
308 dst
->sh_name
= H_GET_32 (abfd
, src
->sh_name
);
309 dst
->sh_type
= H_GET_32 (abfd
, src
->sh_type
);
310 dst
->sh_flags
= H_GET_WORD (abfd
, src
->sh_flags
);
312 dst
->sh_addr
= H_GET_SIGNED_WORD (abfd
, src
->sh_addr
);
314 dst
->sh_addr
= H_GET_WORD (abfd
, src
->sh_addr
);
315 dst
->sh_offset
= H_GET_WORD (abfd
, src
->sh_offset
);
316 dst
->sh_size
= H_GET_WORD (abfd
, src
->sh_size
);
317 /* PR 23657. Check for invalid section size, in sections with contents.
318 Note - we do not set an error value here because the contents
319 of this particular section might not be needed by the consumer. */
320 if (dst
->sh_type
!= SHT_NOBITS
)
322 ufile_ptr filesize
= bfd_get_file_size (abfd
);
324 if (filesize
!= 0 && dst
->sh_size
> filesize
)
326 (_("warning: %pB has a corrupt section with a size (%"
327 BFD_VMA_FMT
"x) larger than the file size"),
330 dst
->sh_link
= H_GET_32 (abfd
, src
->sh_link
);
331 dst
->sh_info
= H_GET_32 (abfd
, src
->sh_info
);
332 dst
->sh_addralign
= H_GET_WORD (abfd
, src
->sh_addralign
);
333 dst
->sh_entsize
= H_GET_WORD (abfd
, src
->sh_entsize
);
334 dst
->bfd_section
= NULL
;
335 dst
->contents
= NULL
;
338 /* Translate an ELF section header table entry in internal format into an
339 ELF section header table entry in external format. */
342 elf_swap_shdr_out (bfd
*abfd
,
343 const Elf_Internal_Shdr
*src
,
344 Elf_External_Shdr
*dst
)
346 /* note that all elements of dst are *arrays of unsigned char* already... */
347 H_PUT_32 (abfd
, src
->sh_name
, dst
->sh_name
);
348 H_PUT_32 (abfd
, src
->sh_type
, dst
->sh_type
);
349 H_PUT_WORD (abfd
, src
->sh_flags
, dst
->sh_flags
);
350 H_PUT_WORD (abfd
, src
->sh_addr
, dst
->sh_addr
);
351 H_PUT_WORD (abfd
, src
->sh_offset
, dst
->sh_offset
);
352 H_PUT_WORD (abfd
, src
->sh_size
, dst
->sh_size
);
353 H_PUT_32 (abfd
, src
->sh_link
, dst
->sh_link
);
354 H_PUT_32 (abfd
, src
->sh_info
, dst
->sh_info
);
355 H_PUT_WORD (abfd
, src
->sh_addralign
, dst
->sh_addralign
);
356 H_PUT_WORD (abfd
, src
->sh_entsize
, dst
->sh_entsize
);
359 /* Translate an ELF program header table entry in external format into an
360 ELF program header table entry in internal format. */
363 elf_swap_phdr_in (bfd
*abfd
,
364 const Elf_External_Phdr
*src
,
365 Elf_Internal_Phdr
*dst
)
367 int signed_vma
= get_elf_backend_data (abfd
)->sign_extend_vma
;
369 dst
->p_type
= H_GET_32 (abfd
, src
->p_type
);
370 dst
->p_flags
= H_GET_32 (abfd
, src
->p_flags
);
371 dst
->p_offset
= H_GET_WORD (abfd
, src
->p_offset
);
374 dst
->p_vaddr
= H_GET_SIGNED_WORD (abfd
, src
->p_vaddr
);
375 dst
->p_paddr
= H_GET_SIGNED_WORD (abfd
, src
->p_paddr
);
379 dst
->p_vaddr
= H_GET_WORD (abfd
, src
->p_vaddr
);
380 dst
->p_paddr
= H_GET_WORD (abfd
, src
->p_paddr
);
382 dst
->p_filesz
= H_GET_WORD (abfd
, src
->p_filesz
);
383 dst
->p_memsz
= H_GET_WORD (abfd
, src
->p_memsz
);
384 dst
->p_align
= H_GET_WORD (abfd
, src
->p_align
);
388 elf_swap_phdr_out (bfd
*abfd
,
389 const Elf_Internal_Phdr
*src
,
390 Elf_External_Phdr
*dst
)
392 const struct elf_backend_data
*bed
;
395 bed
= get_elf_backend_data (abfd
);
396 p_paddr
= bed
->want_p_paddr_set_to_zero
? 0 : src
->p_paddr
;
398 /* note that all elements of dst are *arrays of unsigned char* already... */
399 H_PUT_32 (abfd
, src
->p_type
, dst
->p_type
);
400 H_PUT_WORD (abfd
, src
->p_offset
, dst
->p_offset
);
401 H_PUT_WORD (abfd
, src
->p_vaddr
, dst
->p_vaddr
);
402 H_PUT_WORD (abfd
, p_paddr
, dst
->p_paddr
);
403 H_PUT_WORD (abfd
, src
->p_filesz
, dst
->p_filesz
);
404 H_PUT_WORD (abfd
, src
->p_memsz
, dst
->p_memsz
);
405 H_PUT_32 (abfd
, src
->p_flags
, dst
->p_flags
);
406 H_PUT_WORD (abfd
, src
->p_align
, dst
->p_align
);
409 /* Translate an ELF reloc from external format to internal format. */
411 elf_swap_reloc_in (bfd
*abfd
,
413 Elf_Internal_Rela
*dst
)
415 const Elf_External_Rel
*src
= (const Elf_External_Rel
*) s
;
416 dst
->r_offset
= H_GET_WORD (abfd
, src
->r_offset
);
417 dst
->r_info
= H_GET_WORD (abfd
, src
->r_info
);
422 elf_swap_reloca_in (bfd
*abfd
,
424 Elf_Internal_Rela
*dst
)
426 const Elf_External_Rela
*src
= (const Elf_External_Rela
*) s
;
427 dst
->r_offset
= H_GET_WORD (abfd
, src
->r_offset
);
428 dst
->r_info
= H_GET_WORD (abfd
, src
->r_info
);
429 dst
->r_addend
= H_GET_SIGNED_WORD (abfd
, src
->r_addend
);
432 /* Translate an ELF reloc from internal format to external format. */
434 elf_swap_reloc_out (bfd
*abfd
,
435 const Elf_Internal_Rela
*src
,
438 Elf_External_Rel
*dst
= (Elf_External_Rel
*) d
;
439 H_PUT_WORD (abfd
, src
->r_offset
, dst
->r_offset
);
440 H_PUT_WORD (abfd
, src
->r_info
, dst
->r_info
);
444 elf_swap_reloca_out (bfd
*abfd
,
445 const Elf_Internal_Rela
*src
,
448 Elf_External_Rela
*dst
= (Elf_External_Rela
*) d
;
449 H_PUT_WORD (abfd
, src
->r_offset
, dst
->r_offset
);
450 H_PUT_WORD (abfd
, src
->r_info
, dst
->r_info
);
451 H_PUT_SIGNED_WORD (abfd
, src
->r_addend
, dst
->r_addend
);
455 elf_swap_dyn_in (bfd
*abfd
,
457 Elf_Internal_Dyn
*dst
)
459 const Elf_External_Dyn
*src
= (const Elf_External_Dyn
*) p
;
461 dst
->d_tag
= H_GET_WORD (abfd
, src
->d_tag
);
462 dst
->d_un
.d_val
= H_GET_WORD (abfd
, src
->d_un
.d_val
);
466 elf_swap_dyn_out (bfd
*abfd
,
467 const Elf_Internal_Dyn
*src
,
470 Elf_External_Dyn
*dst
= (Elf_External_Dyn
*) p
;
472 H_PUT_WORD (abfd
, src
->d_tag
, dst
->d_tag
);
473 H_PUT_WORD (abfd
, src
->d_un
.d_val
, dst
->d_un
.d_val
);
476 /* ELF .o/exec file reading */
478 /* Begin processing a given object.
480 First we validate the file by reading in the ELF header and checking
483 static inline bfd_boolean
484 elf_file_p (Elf_External_Ehdr
*x_ehdrp
)
486 return ((x_ehdrp
->e_ident
[EI_MAG0
] == ELFMAG0
)
487 && (x_ehdrp
->e_ident
[EI_MAG1
] == ELFMAG1
)
488 && (x_ehdrp
->e_ident
[EI_MAG2
] == ELFMAG2
)
489 && (x_ehdrp
->e_ident
[EI_MAG3
] == ELFMAG3
));
492 /* Check to see if the file associated with ABFD matches the target vector
495 Note that we may be called several times with the same ABFD, but different
496 target vectors, most of which will not match. We have to avoid leaving
497 any side effects in ABFD, or any data it points to (like tdata), if the
498 file does not match the target vector. */
501 elf_object_p (bfd
*abfd
)
503 Elf_External_Ehdr x_ehdr
; /* Elf file header, external form */
504 Elf_Internal_Ehdr
*i_ehdrp
; /* Elf file header, internal form */
505 Elf_External_Shdr x_shdr
; /* Section header table entry, external form */
506 Elf_Internal_Shdr i_shdr
;
507 Elf_Internal_Shdr
*i_shdrp
; /* Section header table, internal form */
508 unsigned int shindex
;
509 const struct elf_backend_data
*ebd
;
511 const bfd_target
*target
;
513 /* Read in the ELF header in external format. */
515 if (bfd_bread (&x_ehdr
, sizeof (x_ehdr
), abfd
) != sizeof (x_ehdr
))
517 if (bfd_get_error () != bfd_error_system_call
)
518 goto got_wrong_format_error
;
523 /* Now check to see if we have a valid ELF file, and one that BFD can
524 make use of. The magic number must match, the address size ('class')
525 and byte-swapping must match our XVEC entry, and it must have a
526 section header table (FIXME: See comments re sections at top of this
529 if (! elf_file_p (&x_ehdr
)
530 || x_ehdr
.e_ident
[EI_VERSION
] != EV_CURRENT
531 || x_ehdr
.e_ident
[EI_CLASS
] != ELFCLASS
)
532 goto got_wrong_format_error
;
534 /* Check that file's byte order matches xvec's */
535 switch (x_ehdr
.e_ident
[EI_DATA
])
537 case ELFDATA2MSB
: /* Big-endian */
538 if (! bfd_header_big_endian (abfd
))
539 goto got_wrong_format_error
;
541 case ELFDATA2LSB
: /* Little-endian */
542 if (! bfd_header_little_endian (abfd
))
543 goto got_wrong_format_error
;
545 case ELFDATANONE
: /* No data encoding specified */
546 default: /* Unknown data encoding specified */
547 goto got_wrong_format_error
;
552 /* Allocate an instance of the elf_obj_tdata structure and hook it up to
553 the tdata pointer in the bfd. */
555 if (! (*target
->_bfd_set_format
[bfd_object
]) (abfd
))
558 /* Now that we know the byte order, swap in the rest of the header */
559 i_ehdrp
= elf_elfheader (abfd
);
560 elf_swap_ehdr_in (abfd
, &x_ehdr
, i_ehdrp
);
562 elf_debug_file (i_ehdrp
);
565 /* Reject ET_CORE (header indicates core file, not object file) */
566 if (i_ehdrp
->e_type
== ET_CORE
)
567 goto got_wrong_format_error
;
569 /* If this is a relocatable file and there is no section header
570 table, then we're hosed. */
571 if (i_ehdrp
->e_shoff
== 0 && i_ehdrp
->e_type
== ET_REL
)
572 goto got_wrong_format_error
;
574 /* As a simple sanity check, verify that what BFD thinks is the
575 size of each section header table entry actually matches the size
576 recorded in the file, but only if there are any sections. */
577 if (i_ehdrp
->e_shentsize
!= sizeof (x_shdr
) && i_ehdrp
->e_shnum
!= 0)
578 goto got_wrong_format_error
;
580 /* Further sanity check. */
581 if (i_ehdrp
->e_shoff
== 0 && i_ehdrp
->e_shnum
!= 0)
582 goto got_wrong_format_error
;
584 ebd
= get_elf_backend_data (abfd
);
585 if (ebd
->s
->arch_size
!= ARCH_SIZE
)
586 goto got_wrong_format_error
;
588 /* Check that the ELF e_machine field matches what this particular
589 BFD format expects. */
590 if (ebd
->elf_machine_code
!= i_ehdrp
->e_machine
591 && (ebd
->elf_machine_alt1
== 0
592 || i_ehdrp
->e_machine
!= ebd
->elf_machine_alt1
)
593 && (ebd
->elf_machine_alt2
== 0
594 || i_ehdrp
->e_machine
!= ebd
->elf_machine_alt2
)
595 && ebd
->elf_machine_code
!= EM_NONE
)
596 goto got_wrong_format_error
;
598 if (i_ehdrp
->e_type
== ET_EXEC
)
599 abfd
->flags
|= EXEC_P
;
600 else if (i_ehdrp
->e_type
== ET_DYN
)
601 abfd
->flags
|= DYNAMIC
;
603 if (i_ehdrp
->e_phnum
> 0)
604 abfd
->flags
|= D_PAGED
;
606 if (! bfd_default_set_arch_mach (abfd
, ebd
->arch
, 0))
608 /* It's OK if this fails for the generic target. */
609 if (ebd
->elf_machine_code
!= EM_NONE
)
613 if (ebd
->elf_machine_code
!= EM_NONE
614 && i_ehdrp
->e_ident
[EI_OSABI
] != ebd
->elf_osabi
615 && ebd
->elf_osabi
!= ELFOSABI_NONE
)
616 goto got_wrong_format_error
;
618 if (i_ehdrp
->e_shoff
!= 0)
620 file_ptr where
= (file_ptr
) i_ehdrp
->e_shoff
;
622 /* Seek to the section header table in the file. */
623 if (bfd_seek (abfd
, where
, SEEK_SET
) != 0)
626 /* Read the first section header at index 0, and convert to internal
628 if (bfd_bread (&x_shdr
, sizeof x_shdr
, abfd
) != sizeof (x_shdr
))
630 elf_swap_shdr_in (abfd
, &x_shdr
, &i_shdr
);
632 /* If the section count is zero, the actual count is in the first
634 if (i_ehdrp
->e_shnum
== SHN_UNDEF
)
636 i_ehdrp
->e_shnum
= i_shdr
.sh_size
;
637 if (i_ehdrp
->e_shnum
>= SHN_LORESERVE
638 || i_ehdrp
->e_shnum
!= i_shdr
.sh_size
639 || i_ehdrp
->e_shnum
== 0)
640 goto got_wrong_format_error
;
643 /* And similarly for the string table index. */
644 if (i_ehdrp
->e_shstrndx
== (SHN_XINDEX
& 0xffff))
646 i_ehdrp
->e_shstrndx
= i_shdr
.sh_link
;
647 if (i_ehdrp
->e_shstrndx
!= i_shdr
.sh_link
)
648 goto got_wrong_format_error
;
651 /* And program headers. */
652 if (i_ehdrp
->e_phnum
== PN_XNUM
&& i_shdr
.sh_info
!= 0)
654 i_ehdrp
->e_phnum
= i_shdr
.sh_info
;
655 if (i_ehdrp
->e_phnum
!= i_shdr
.sh_info
)
656 goto got_wrong_format_error
;
659 /* Sanity check that we can read all of the section headers.
660 It ought to be good enough to just read the last one. */
661 if (i_ehdrp
->e_shnum
!= 1)
663 /* Check that we don't have a totally silly number of sections. */
664 if (i_ehdrp
->e_shnum
> (unsigned int) -1 / sizeof (x_shdr
)
665 || i_ehdrp
->e_shnum
> (unsigned int) -1 / sizeof (i_shdr
))
666 goto got_wrong_format_error
;
668 where
+= (i_ehdrp
->e_shnum
- 1) * sizeof (x_shdr
);
669 if ((bfd_size_type
) where
<= i_ehdrp
->e_shoff
)
670 goto got_wrong_format_error
;
672 if (bfd_seek (abfd
, where
, SEEK_SET
) != 0)
674 if (bfd_bread (&x_shdr
, sizeof x_shdr
, abfd
) != sizeof (x_shdr
))
677 /* Back to where we were. */
678 where
= i_ehdrp
->e_shoff
+ sizeof (x_shdr
);
679 if (bfd_seek (abfd
, where
, SEEK_SET
) != 0)
684 /* Allocate space for a copy of the section header table in
686 if (i_ehdrp
->e_shnum
!= 0)
688 Elf_Internal_Shdr
*shdrp
;
689 unsigned int num_sec
;
692 if (_bfd_mul_overflow (i_ehdrp
->e_shnum
, sizeof (*i_shdrp
), &amt
))
693 goto got_wrong_format_error
;
694 i_shdrp
= (Elf_Internal_Shdr
*) bfd_alloc (abfd
, amt
);
697 num_sec
= i_ehdrp
->e_shnum
;
698 elf_numsections (abfd
) = num_sec
;
699 if (_bfd_mul_overflow (num_sec
, sizeof (i_shdrp
), &amt
))
700 goto got_wrong_format_error
;
701 elf_elfsections (abfd
) = (Elf_Internal_Shdr
**) bfd_alloc (abfd
, amt
);
702 if (!elf_elfsections (abfd
))
705 memcpy (i_shdrp
, &i_shdr
, sizeof (*i_shdrp
));
706 for (shdrp
= i_shdrp
, shindex
= 0; shindex
< num_sec
; shindex
++)
707 elf_elfsections (abfd
)[shindex
] = shdrp
++;
709 /* Read in the rest of the section header table and convert it
711 for (shindex
= 1; shindex
< i_ehdrp
->e_shnum
; shindex
++)
713 if (bfd_bread (&x_shdr
, sizeof x_shdr
, abfd
) != sizeof (x_shdr
))
715 elf_swap_shdr_in (abfd
, &x_shdr
, i_shdrp
+ shindex
);
717 /* Sanity check sh_link and sh_info. */
718 if (i_shdrp
[shindex
].sh_link
>= num_sec
)
720 /* PR 10478: Accept Solaris binaries with a sh_link
721 field set to SHN_BEFORE or SHN_AFTER. */
722 switch (ebd
->elf_machine_code
)
731 if (i_shdrp
[shindex
].sh_link
== (SHN_LORESERVE
& 0xffff) /* SHN_BEFORE */
732 || i_shdrp
[shindex
].sh_link
== ((SHN_LORESERVE
+ 1) & 0xffff) /* SHN_AFTER */)
734 /* Otherwise fall through. */
736 goto got_wrong_format_error
;
740 if (((i_shdrp
[shindex
].sh_flags
& SHF_INFO_LINK
)
741 || i_shdrp
[shindex
].sh_type
== SHT_RELA
742 || i_shdrp
[shindex
].sh_type
== SHT_REL
)
743 && i_shdrp
[shindex
].sh_info
>= num_sec
)
744 goto got_wrong_format_error
;
746 /* If the section is loaded, but not page aligned, clear
748 if (i_shdrp
[shindex
].sh_size
!= 0
749 && (i_shdrp
[shindex
].sh_flags
& SHF_ALLOC
) != 0
750 && i_shdrp
[shindex
].sh_type
!= SHT_NOBITS
751 && (((i_shdrp
[shindex
].sh_addr
- i_shdrp
[shindex
].sh_offset
)
754 abfd
->flags
&= ~D_PAGED
;
757 if (i_ehdrp
->e_shstrndx
>= elf_numsections (abfd
)
758 || i_shdrp
[i_ehdrp
->e_shstrndx
].sh_type
!= SHT_STRTAB
)
761 We used to just goto got_wrong_format_error here
762 but there are binaries in existance for which this test
763 will prevent the binutils from working with them at all.
764 So we are kind, and reset the string index value to 0
765 so that at least some processing can be done. */
766 i_ehdrp
->e_shstrndx
= SHN_UNDEF
;
768 (_("warning: %pB has a corrupt string table index - ignoring"),
772 else if (i_ehdrp
->e_shstrndx
!= SHN_UNDEF
)
773 goto got_wrong_format_error
;
775 /* Read in the program headers. */
776 if (i_ehdrp
->e_phnum
== 0)
777 elf_tdata (abfd
)->phdr
= NULL
;
780 Elf_Internal_Phdr
*i_phdr
;
785 /* Check for a corrupt input file with an impossibly large number
786 of program headers. */
787 filesize
= bfd_get_file_size (abfd
);
789 && i_ehdrp
->e_phnum
> filesize
/ sizeof (Elf_External_Phdr
))
790 goto got_wrong_format_error
;
791 if (_bfd_mul_overflow (i_ehdrp
->e_phnum
, sizeof (*i_phdr
), &amt
))
792 goto got_wrong_format_error
;
793 elf_tdata (abfd
)->phdr
794 = (Elf_Internal_Phdr
*) bfd_alloc (abfd
, amt
);
795 if (elf_tdata (abfd
)->phdr
== NULL
)
797 if (bfd_seek (abfd
, (file_ptr
) i_ehdrp
->e_phoff
, SEEK_SET
) != 0)
799 i_phdr
= elf_tdata (abfd
)->phdr
;
800 for (i
= 0; i
< i_ehdrp
->e_phnum
; i
++, i_phdr
++)
802 Elf_External_Phdr x_phdr
;
804 if (bfd_bread (&x_phdr
, sizeof x_phdr
, abfd
) != sizeof x_phdr
)
806 elf_swap_phdr_in (abfd
, &x_phdr
, i_phdr
);
810 if (i_ehdrp
->e_shstrndx
!= 0 && i_ehdrp
->e_shoff
!= 0)
812 unsigned int num_sec
;
814 /* Once all of the section headers have been read and converted, we
815 can start processing them. Note that the first section header is
816 a dummy placeholder entry, so we ignore it. */
817 num_sec
= elf_numsections (abfd
);
818 for (shindex
= 1; shindex
< num_sec
; shindex
++)
819 if (!bfd_section_from_shdr (abfd
, shindex
))
822 /* Set up ELF sections for SHF_GROUP and SHF_LINK_ORDER. */
823 if (! _bfd_elf_setup_sections (abfd
))
824 goto got_wrong_format_error
;
827 /* Let the backend double check the format and override global
829 if (ebd
->elf_backend_object_p
)
831 if (! (*ebd
->elf_backend_object_p
) (abfd
))
832 goto got_wrong_format_error
;
835 /* Remember the entry point specified in the ELF file header. */
836 bfd_set_start_address (abfd
, i_ehdrp
->e_entry
);
838 /* If we have created any reloc sections that are associated with
839 debugging sections, mark the reloc sections as debugging as well. */
840 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
842 if ((elf_section_data (s
)->this_hdr
.sh_type
== SHT_REL
843 || elf_section_data (s
)->this_hdr
.sh_type
== SHT_RELA
)
844 && elf_section_data (s
)->this_hdr
.sh_info
> 0)
846 unsigned long targ_index
;
849 targ_index
= elf_section_data (s
)->this_hdr
.sh_info
;
850 targ_sec
= bfd_section_from_elf_index (abfd
, targ_index
);
852 && (targ_sec
->flags
& SEC_DEBUGGING
) != 0)
853 s
->flags
|= SEC_DEBUGGING
;
856 return _bfd_no_cleanup
;
858 got_wrong_format_error
:
859 bfd_set_error (bfd_error_wrong_format
);
865 /* ELF .o/exec file writing */
867 /* Write out the relocs. */
870 elf_write_relocs (bfd
*abfd
, asection
*sec
, void *data
)
872 const struct elf_backend_data
* const bed
= get_elf_backend_data (abfd
);
873 bfd_boolean
*failedp
= (bfd_boolean
*) data
;
874 Elf_Internal_Shdr
*rela_hdr
;
876 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
884 /* If we have already failed, don't do anything. */
888 if ((sec
->flags
& SEC_RELOC
) == 0)
891 /* The linker backend writes the relocs out itself, and sets the
892 reloc_count field to zero to inhibit writing them here. Also,
893 sometimes the SEC_RELOC flag gets set even when there aren't any
895 if (sec
->reloc_count
== 0)
898 /* If we have opened an existing file for update, reloc_count may be
899 set even though we are not linking. In that case we have nothing
901 if (sec
->orelocation
== NULL
)
904 rela_hdr
= elf_section_data (sec
)->rela
.hdr
;
905 if (rela_hdr
== NULL
)
906 rela_hdr
= elf_section_data (sec
)->rel
.hdr
;
908 rela_hdr
->sh_size
= rela_hdr
->sh_entsize
* sec
->reloc_count
;
909 if (_bfd_mul_overflow (sec
->reloc_count
, rela_hdr
->sh_entsize
, &amt
)
910 || (rela_hdr
->contents
= bfd_alloc (abfd
, amt
)) == NULL
)
912 bfd_set_error (bfd_error_no_memory
);
917 /* Figure out whether the relocations are RELA or REL relocations. */
918 if (rela_hdr
->sh_type
== SHT_RELA
)
920 swap_out
= elf_swap_reloca_out
;
921 extsize
= sizeof (Elf_External_Rela
);
923 else if (rela_hdr
->sh_type
== SHT_REL
)
925 swap_out
= elf_swap_reloc_out
;
926 extsize
= sizeof (Elf_External_Rel
);
929 /* Every relocation section should be either an SHT_RELA or an
933 /* The address of an ELF reloc is section relative for an object
934 file, and absolute for an executable file or shared library.
935 The address of a BFD reloc is always section relative. */
937 if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
938 addr_offset
= sec
->vma
;
940 /* orelocation has the data, reloc_count has the count... */
943 dst_rela
= rela_hdr
->contents
;
945 for (idx
= 0; idx
< sec
->reloc_count
; idx
++, dst_rela
+= extsize
)
947 Elf_Internal_Rela src_rela
;
952 ptr
= sec
->orelocation
[idx
];
953 sym
= *ptr
->sym_ptr_ptr
;
956 else if (bfd_is_abs_section (sym
->section
) && sym
->value
== 0)
961 n
= _bfd_elf_symbol_from_bfd_symbol (abfd
, &sym
);
970 if ((*ptr
->sym_ptr_ptr
)->the_bfd
!= NULL
971 && (*ptr
->sym_ptr_ptr
)->the_bfd
->xvec
!= abfd
->xvec
972 && ! _bfd_elf_validate_reloc (abfd
, ptr
))
978 if (ptr
->howto
== NULL
)
984 src_rela
.r_offset
= ptr
->address
+ addr_offset
;
985 src_rela
.r_info
= ELF_R_INFO (n
, ptr
->howto
->type
);
986 src_rela
.r_addend
= ptr
->addend
;
987 (*swap_out
) (abfd
, &src_rela
, dst_rela
);
990 if (!bed
->write_secondary_relocs (abfd
, sec
))
997 /* Write out the program headers. */
1000 elf_write_out_phdrs (bfd
*abfd
,
1001 const Elf_Internal_Phdr
*phdr
,
1006 Elf_External_Phdr extphdr
;
1008 elf_swap_phdr_out (abfd
, phdr
, &extphdr
);
1009 if (bfd_bwrite (&extphdr
, sizeof (Elf_External_Phdr
), abfd
)
1010 != sizeof (Elf_External_Phdr
))
1017 /* Write out the section headers and the ELF file header. */
1020 elf_write_shdrs_and_ehdr (bfd
*abfd
)
1022 Elf_External_Ehdr x_ehdr
; /* Elf file header, external form */
1023 Elf_Internal_Ehdr
*i_ehdrp
; /* Elf file header, internal form */
1024 Elf_External_Shdr
*x_shdrp
; /* Section header table, external form */
1025 Elf_Internal_Shdr
**i_shdrp
; /* Section header table, internal form */
1029 i_ehdrp
= elf_elfheader (abfd
);
1030 i_shdrp
= elf_elfsections (abfd
);
1032 /* swap the header before spitting it out... */
1035 elf_debug_file (i_ehdrp
);
1037 elf_swap_ehdr_out (abfd
, i_ehdrp
, &x_ehdr
);
1038 amt
= sizeof (x_ehdr
);
1039 if (bfd_seek (abfd
, (file_ptr
) 0, SEEK_SET
) != 0
1040 || bfd_bwrite (&x_ehdr
, amt
, abfd
) != amt
)
1043 /* Some fields in the first section header handle overflow of ehdr
1045 if (i_ehdrp
->e_phnum
>= PN_XNUM
)
1046 i_shdrp
[0]->sh_info
= i_ehdrp
->e_phnum
;
1047 if (i_ehdrp
->e_shnum
>= (SHN_LORESERVE
& 0xffff))
1048 i_shdrp
[0]->sh_size
= i_ehdrp
->e_shnum
;
1049 if (i_ehdrp
->e_shstrndx
>= (SHN_LORESERVE
& 0xffff))
1050 i_shdrp
[0]->sh_link
= i_ehdrp
->e_shstrndx
;
1052 /* at this point we've concocted all the ELF sections... */
1053 if (_bfd_mul_overflow (i_ehdrp
->e_shnum
, sizeof (*x_shdrp
), &amt
))
1055 bfd_set_error (bfd_error_no_memory
);
1058 x_shdrp
= (Elf_External_Shdr
*) bfd_alloc (abfd
, amt
);
1062 for (count
= 0; count
< i_ehdrp
->e_shnum
; i_shdrp
++, count
++)
1065 elf_debug_section (count
, *i_shdrp
);
1067 elf_swap_shdr_out (abfd
, *i_shdrp
, x_shdrp
+ count
);
1069 amt
= (bfd_size_type
) i_ehdrp
->e_shnum
* sizeof (*x_shdrp
);
1070 if (bfd_seek (abfd
, (file_ptr
) i_ehdrp
->e_shoff
, SEEK_SET
) != 0
1071 || bfd_bwrite (x_shdrp
, amt
, abfd
) != amt
)
1074 /* need to dump the string table too... */
1080 elf_checksum_contents (bfd
*abfd
,
1081 void (*process
) (const void *, size_t, void *),
1084 Elf_Internal_Ehdr
*i_ehdrp
= elf_elfheader (abfd
);
1085 Elf_Internal_Shdr
**i_shdrp
= elf_elfsections (abfd
);
1086 Elf_Internal_Phdr
*i_phdrp
= elf_tdata (abfd
)->phdr
;
1087 unsigned int count
, num
;
1090 Elf_External_Ehdr x_ehdr
;
1091 Elf_Internal_Ehdr i_ehdr
;
1094 i_ehdr
.e_phoff
= i_ehdr
.e_shoff
= 0;
1095 elf_swap_ehdr_out (abfd
, &i_ehdr
, &x_ehdr
);
1096 (*process
) (&x_ehdr
, sizeof x_ehdr
, arg
);
1099 num
= i_ehdrp
->e_phnum
;
1100 for (count
= 0; count
< num
; count
++)
1102 Elf_External_Phdr x_phdr
;
1103 elf_swap_phdr_out (abfd
, &i_phdrp
[count
], &x_phdr
);
1104 (*process
) (&x_phdr
, sizeof x_phdr
, arg
);
1107 num
= elf_numsections (abfd
);
1108 for (count
= 0; count
< num
; count
++)
1110 Elf_Internal_Shdr i_shdr
;
1111 Elf_External_Shdr x_shdr
;
1112 bfd_byte
*contents
, *free_contents
;
1114 i_shdr
= *i_shdrp
[count
];
1115 i_shdr
.sh_offset
= 0;
1117 elf_swap_shdr_out (abfd
, &i_shdr
, &x_shdr
);
1118 (*process
) (&x_shdr
, sizeof x_shdr
, arg
);
1120 /* Process the section's contents, if it has some.
1121 PR ld/12451: Read them in if necessary. */
1122 if (i_shdr
.sh_type
== SHT_NOBITS
)
1124 free_contents
= NULL
;
1125 contents
= i_shdr
.contents
;
1126 if (contents
== NULL
)
1130 sec
= bfd_section_from_elf_index (abfd
, count
);
1133 contents
= sec
->contents
;
1134 if (contents
== NULL
)
1136 /* Force rereading from file. */
1137 sec
->flags
&= ~SEC_IN_MEMORY
;
1138 if (!bfd_malloc_and_get_section (abfd
, sec
, &free_contents
))
1140 contents
= free_contents
;
1144 if (contents
!= NULL
)
1146 (*process
) (contents
, i_shdr
.sh_size
, arg
);
1147 if (free_contents
!= NULL
)
1148 free (free_contents
);
1156 elf_slurp_symbol_table (bfd
*abfd
, asymbol
**symptrs
, bfd_boolean dynamic
)
1158 Elf_Internal_Shdr
*hdr
;
1159 Elf_Internal_Shdr
*verhdr
;
1160 unsigned long symcount
; /* Number of external ELF symbols */
1161 elf_symbol_type
*sym
; /* Pointer to current bfd symbol */
1162 elf_symbol_type
*symbase
; /* Buffer for generated bfd symbols */
1163 Elf_Internal_Sym
*isym
;
1164 Elf_Internal_Sym
*isymend
;
1165 Elf_Internal_Sym
*isymbuf
= NULL
;
1166 Elf_External_Versym
*xver
;
1167 Elf_External_Versym
*xverbuf
= NULL
;
1168 const struct elf_backend_data
*ebd
;
1171 /* Read each raw ELF symbol, converting from external ELF form to
1172 internal ELF form, and then using the information to create a
1173 canonical bfd symbol table entry.
1175 Note that we allocate the initial bfd canonical symbol buffer
1176 based on a one-to-one mapping of the ELF symbols to canonical
1177 symbols. We actually use all the ELF symbols, so there will be no
1178 space left over at the end. When we have all the symbols, we
1179 build the caller's pointer vector. */
1183 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1188 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
1189 if (elf_dynversym (abfd
) == 0)
1192 verhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
1193 if ((elf_dynverdef (abfd
) != 0
1194 && elf_tdata (abfd
)->verdef
== NULL
)
1195 || (elf_dynverref (abfd
) != 0
1196 && elf_tdata (abfd
)->verref
== NULL
))
1198 if (!_bfd_elf_slurp_version_tables (abfd
, FALSE
))
1203 ebd
= get_elf_backend_data (abfd
);
1204 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
1206 sym
= symbase
= NULL
;
1209 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, symcount
, 0,
1211 if (isymbuf
== NULL
)
1214 if (_bfd_mul_overflow (symcount
, sizeof (elf_symbol_type
), &amt
))
1216 bfd_set_error (bfd_error_file_too_big
);
1219 symbase
= (elf_symbol_type
*) bfd_zalloc (abfd
, amt
);
1220 if (symbase
== (elf_symbol_type
*) NULL
)
1223 /* Read the raw ELF version symbol information. */
1225 && verhdr
->sh_size
/ sizeof (Elf_External_Versym
) != symcount
)
1228 /* xgettext:c-format */
1229 (_("%pB: version count (%" PRId64
")"
1230 " does not match symbol count (%ld)"),
1232 (int64_t) (verhdr
->sh_size
/ sizeof (Elf_External_Versym
)),
1235 /* Slurp in the symbols without the version information,
1236 since that is more helpful than just quitting. */
1242 if (bfd_seek (abfd
, verhdr
->sh_offset
, SEEK_SET
) != 0)
1244 xverbuf
= (Elf_External_Versym
*)
1245 _bfd_malloc_and_read (abfd
, verhdr
->sh_size
, verhdr
->sh_size
);
1246 if (xverbuf
== NULL
&& verhdr
->sh_size
!= 0)
1250 /* Skip first symbol, which is a null dummy. */
1254 isymend
= isymbuf
+ symcount
;
1255 for (isym
= isymbuf
+ 1, sym
= symbase
; isym
< isymend
; isym
++, sym
++)
1257 memcpy (&sym
->internal_elf_sym
, isym
, sizeof (Elf_Internal_Sym
));
1259 sym
->symbol
.the_bfd
= abfd
;
1260 sym
->symbol
.name
= bfd_elf_sym_name (abfd
, hdr
, isym
, NULL
);
1261 sym
->symbol
.value
= isym
->st_value
;
1263 if (isym
->st_shndx
== SHN_UNDEF
)
1265 sym
->symbol
.section
= bfd_und_section_ptr
;
1267 else if (isym
->st_shndx
== SHN_ABS
)
1269 sym
->symbol
.section
= bfd_abs_section_ptr
;
1271 else if (isym
->st_shndx
== SHN_COMMON
)
1273 sym
->symbol
.section
= bfd_com_section_ptr
;
1274 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
1276 asection
*xc
= bfd_get_section_by_name (abfd
, "COMMON");
1280 flagword flags
= (SEC_ALLOC
| SEC_IS_COMMON
| SEC_KEEP
1282 xc
= bfd_make_section_with_flags (abfd
, "COMMON", flags
);
1286 sym
->symbol
.section
= xc
;
1288 /* Elf puts the alignment into the `value' field, and
1289 the size into the `size' field. BFD wants to see the
1290 size in the value field, and doesn't care (at the
1291 moment) about the alignment. */
1292 sym
->symbol
.value
= isym
->st_size
;
1297 = bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
1298 if (sym
->symbol
.section
== NULL
)
1300 /* This symbol is in a section for which we did not
1301 create a BFD section. Just use bfd_abs_section,
1302 although it is wrong. FIXME. Note - there is
1303 code in elf.c:swap_out_syms that calls
1304 symbol_section_index() in the elf backend for
1306 sym
->symbol
.section
= bfd_abs_section_ptr
;
1310 /* If this is a relocatable file, then the symbol value is
1311 already section relative. */
1312 if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1313 sym
->symbol
.value
-= sym
->symbol
.section
->vma
;
1315 switch (ELF_ST_BIND (isym
->st_info
))
1318 sym
->symbol
.flags
|= BSF_LOCAL
;
1321 if (isym
->st_shndx
!= SHN_UNDEF
&& isym
->st_shndx
!= SHN_COMMON
)
1322 sym
->symbol
.flags
|= BSF_GLOBAL
;
1325 sym
->symbol
.flags
|= BSF_WEAK
;
1327 case STB_GNU_UNIQUE
:
1328 sym
->symbol
.flags
|= BSF_GNU_UNIQUE
;
1332 switch (ELF_ST_TYPE (isym
->st_info
))
1335 sym
->symbol
.flags
|= BSF_SECTION_SYM
| BSF_DEBUGGING
;
1338 sym
->symbol
.flags
|= BSF_FILE
| BSF_DEBUGGING
;
1341 sym
->symbol
.flags
|= BSF_FUNCTION
;
1344 /* FIXME: Do we have to put the size field into the value field
1345 as we do with symbols in SHN_COMMON sections (see above) ? */
1346 sym
->symbol
.flags
|= BSF_ELF_COMMON
;
1349 sym
->symbol
.flags
|= BSF_OBJECT
;
1352 sym
->symbol
.flags
|= BSF_THREAD_LOCAL
;
1355 sym
->symbol
.flags
|= BSF_RELC
;
1358 sym
->symbol
.flags
|= BSF_SRELC
;
1361 sym
->symbol
.flags
|= BSF_GNU_INDIRECT_FUNCTION
;
1366 sym
->symbol
.flags
|= BSF_DYNAMIC
;
1370 Elf_Internal_Versym iversym
;
1372 _bfd_elf_swap_versym_in (abfd
, xver
, &iversym
);
1373 sym
->version
= iversym
.vs_vers
;
1377 /* Do some backend-specific processing on this symbol. */
1378 if (ebd
->elf_backend_symbol_processing
)
1379 (*ebd
->elf_backend_symbol_processing
) (abfd
, &sym
->symbol
);
1383 /* Do some backend-specific processing on this symbol table. */
1384 if (ebd
->elf_backend_symbol_table_processing
)
1385 (*ebd
->elf_backend_symbol_table_processing
) (abfd
, symbase
, symcount
);
1387 /* We rely on the zalloc to clear out the final symbol entry. */
1389 symcount
= sym
- symbase
;
1391 /* Fill in the user's symbol pointer vector if needed. */
1399 *symptrs
++ = &sym
->symbol
;
1402 *symptrs
= 0; /* Final null pointer */
1405 if (xverbuf
!= NULL
)
1407 if (isymbuf
!= NULL
&& hdr
->contents
!= (unsigned char *) isymbuf
)
1412 if (xverbuf
!= NULL
)
1414 if (isymbuf
!= NULL
&& hdr
->contents
!= (unsigned char *) isymbuf
)
1419 /* Read relocations for ASECT from REL_HDR. There are RELOC_COUNT of
1423 elf_slurp_reloc_table_from_section (bfd
*abfd
,
1425 Elf_Internal_Shdr
*rel_hdr
,
1426 bfd_size_type reloc_count
,
1429 bfd_boolean dynamic
)
1431 const struct elf_backend_data
* const ebd
= get_elf_backend_data (abfd
);
1432 void *allocated
= NULL
;
1433 bfd_byte
*native_relocs
;
1437 unsigned int symcount
;
1439 if (bfd_seek (abfd
, rel_hdr
->sh_offset
, SEEK_SET
) != 0)
1441 allocated
= _bfd_malloc_and_read (abfd
, rel_hdr
->sh_size
, rel_hdr
->sh_size
);
1442 if (allocated
== NULL
)
1445 native_relocs
= (bfd_byte
*) allocated
;
1447 entsize
= rel_hdr
->sh_entsize
;
1448 BFD_ASSERT (entsize
== sizeof (Elf_External_Rel
)
1449 || entsize
== sizeof (Elf_External_Rela
));
1452 symcount
= bfd_get_dynamic_symcount (abfd
);
1454 symcount
= bfd_get_symcount (abfd
);
1456 for (i
= 0, relent
= relents
;
1458 i
++, relent
++, native_relocs
+= entsize
)
1461 Elf_Internal_Rela rela
;
1463 if (entsize
== sizeof (Elf_External_Rela
))
1464 elf_swap_reloca_in (abfd
, native_relocs
, &rela
);
1466 elf_swap_reloc_in (abfd
, native_relocs
, &rela
);
1468 /* The address of an ELF reloc is section relative for an object
1469 file, and absolute for an executable file or shared library.
1470 The address of a normal BFD reloc is always section relative,
1471 and the address of a dynamic reloc is absolute.. */
1472 if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) == 0 || dynamic
)
1473 relent
->address
= rela
.r_offset
;
1475 relent
->address
= rela
.r_offset
- asect
->vma
;
1477 if (ELF_R_SYM (rela
.r_info
) == STN_UNDEF
)
1478 /* FIXME: This and the error case below mean that we have a
1479 symbol on relocs that is not elf_symbol_type. */
1480 relent
->sym_ptr_ptr
= bfd_abs_section_ptr
->symbol_ptr_ptr
;
1481 else if (ELF_R_SYM (rela
.r_info
) > symcount
)
1484 /* xgettext:c-format */
1485 (_("%pB(%pA): relocation %d has invalid symbol index %ld"),
1486 abfd
, asect
, i
, (long) ELF_R_SYM (rela
.r_info
));
1487 bfd_set_error (bfd_error_bad_value
);
1488 relent
->sym_ptr_ptr
= bfd_abs_section_ptr
->symbol_ptr_ptr
;
1494 ps
= symbols
+ ELF_R_SYM (rela
.r_info
) - 1;
1496 relent
->sym_ptr_ptr
= ps
;
1499 relent
->addend
= rela
.r_addend
;
1501 if ((entsize
== sizeof (Elf_External_Rela
)
1502 && ebd
->elf_info_to_howto
!= NULL
)
1503 || ebd
->elf_info_to_howto_rel
== NULL
)
1504 res
= ebd
->elf_info_to_howto (abfd
, relent
, &rela
);
1506 res
= ebd
->elf_info_to_howto_rel (abfd
, relent
, &rela
);
1508 if (! res
|| relent
->howto
== NULL
)
1512 if (allocated
!= NULL
)
1517 if (allocated
!= NULL
)
1522 /* Read in and swap the external relocs. */
1525 elf_slurp_reloc_table (bfd
*abfd
,
1528 bfd_boolean dynamic
)
1530 const struct elf_backend_data
* const bed
= get_elf_backend_data (abfd
);
1531 struct bfd_elf_section_data
* const d
= elf_section_data (asect
);
1532 Elf_Internal_Shdr
*rel_hdr
;
1533 Elf_Internal_Shdr
*rel_hdr2
;
1534 bfd_size_type reloc_count
;
1535 bfd_size_type reloc_count2
;
1539 if (asect
->relocation
!= NULL
)
1544 if ((asect
->flags
& SEC_RELOC
) == 0
1545 || asect
->reloc_count
== 0)
1548 rel_hdr
= d
->rel
.hdr
;
1549 reloc_count
= rel_hdr
? NUM_SHDR_ENTRIES (rel_hdr
) : 0;
1550 rel_hdr2
= d
->rela
.hdr
;
1551 reloc_count2
= rel_hdr2
? NUM_SHDR_ENTRIES (rel_hdr2
) : 0;
1553 /* PR 17512: file: 0b4f81b7. */
1554 if (asect
->reloc_count
!= reloc_count
+ reloc_count2
)
1556 BFD_ASSERT ((rel_hdr
&& asect
->rel_filepos
== rel_hdr
->sh_offset
)
1557 || (rel_hdr2
&& asect
->rel_filepos
== rel_hdr2
->sh_offset
));
1562 /* Note that ASECT->RELOC_COUNT tends not to be accurate in this
1563 case because relocations against this section may use the
1564 dynamic symbol table, and in that case bfd_section_from_shdr
1565 in elf.c does not update the RELOC_COUNT. */
1566 if (asect
->size
== 0)
1569 rel_hdr
= &d
->this_hdr
;
1570 reloc_count
= NUM_SHDR_ENTRIES (rel_hdr
);
1575 if (_bfd_mul_overflow (reloc_count
+ reloc_count2
, sizeof (arelent
), &amt
))
1577 bfd_set_error (bfd_error_file_too_big
);
1580 relents
= (arelent
*) bfd_alloc (abfd
, amt
);
1581 if (relents
== NULL
)
1585 && !elf_slurp_reloc_table_from_section (abfd
, asect
,
1586 rel_hdr
, reloc_count
,
1592 && !elf_slurp_reloc_table_from_section (abfd
, asect
,
1593 rel_hdr2
, reloc_count2
,
1594 relents
+ reloc_count
,
1598 if (!bed
->slurp_secondary_relocs (abfd
, asect
, symbols
))
1601 asect
->relocation
= relents
;
1607 elf_debug_section (int num
, Elf_Internal_Shdr
*hdr
)
1609 fprintf (stderr
, "\nSection#%d '%s' 0x%.8lx\n", num
,
1610 hdr
->bfd_section
!= NULL
? hdr
->bfd_section
->name
: "",
1613 "sh_name = %ld\tsh_type = %ld\tsh_flags = %ld\n",
1614 (long) hdr
->sh_name
,
1615 (long) hdr
->sh_type
,
1616 (long) hdr
->sh_flags
);
1618 "sh_addr = %ld\tsh_offset = %ld\tsh_size = %ld\n",
1619 (long) hdr
->sh_addr
,
1620 (long) hdr
->sh_offset
,
1621 (long) hdr
->sh_size
);
1623 "sh_link = %ld\tsh_info = %ld\tsh_addralign = %ld\n",
1624 (long) hdr
->sh_link
,
1625 (long) hdr
->sh_info
,
1626 (long) hdr
->sh_addralign
);
1627 fprintf (stderr
, "sh_entsize = %ld\n",
1628 (long) hdr
->sh_entsize
);
1635 elf_debug_file (Elf_Internal_Ehdr
*ehdrp
)
1637 fprintf (stderr
, "e_entry = 0x%.8lx\n", (long) ehdrp
->e_entry
);
1638 fprintf (stderr
, "e_phoff = %ld\n", (long) ehdrp
->e_phoff
);
1639 fprintf (stderr
, "e_phnum = %ld\n", (long) ehdrp
->e_phnum
);
1640 fprintf (stderr
, "e_phentsize = %ld\n", (long) ehdrp
->e_phentsize
);
1641 fprintf (stderr
, "e_shoff = %ld\n", (long) ehdrp
->e_shoff
);
1642 fprintf (stderr
, "e_shnum = %ld\n", (long) ehdrp
->e_shnum
);
1643 fprintf (stderr
, "e_shentsize = %ld\n", (long) ehdrp
->e_shentsize
);
1647 /* Create a new BFD as if by bfd_openr. Rather than opening a file,
1648 reconstruct an ELF file by reading the segments out of remote
1649 memory based on the ELF file header at EHDR_VMA and the ELF program
1650 headers it points to. If non-zero, SIZE is the known extent of the
1651 object. If not null, *LOADBASEP is filled in with the difference
1652 between the VMAs from which the segments were read, and the VMAs
1653 the file headers (and hence BFD's idea of each section's VMA) put
1656 The function TARGET_READ_MEMORY is called to copy LEN bytes from
1657 the remote memory at target address VMA into the local buffer at
1658 MYADDR; it should return zero on success or an `errno' code on
1659 failure. TEMPL must be a BFD for a target with the word size and
1660 byte order found in the remote memory. */
1663 NAME(_bfd_elf
,bfd_from_remote_memory
)
1665 bfd_vma ehdr_vma
/* Bytes. */,
1666 bfd_size_type size
/* Octets. */,
1667 bfd_vma
*loadbasep
/* Bytes. */,
1668 int (*target_read_memory
) (bfd_vma
, bfd_byte
*, bfd_size_type
))
1669 /* (Bytes , , octets ). */
1671 Elf_External_Ehdr x_ehdr
; /* Elf file header, external form */
1672 Elf_Internal_Ehdr i_ehdr
; /* Elf file header, internal form */
1673 Elf_External_Phdr
*x_phdrs
;
1674 Elf_Internal_Phdr
*i_phdrs
, *last_phdr
, *first_phdr
;
1676 struct bfd_in_memory
*bim
;
1680 bfd_vma high_offset
;
1682 bfd_vma loadbase
; /* Bytes. */
1685 unsigned int opb
= bfd_octets_per_byte (templ
, NULL
);
1687 /* Read in the ELF header in external format. */
1688 err
= target_read_memory (ehdr_vma
, (bfd_byte
*) &x_ehdr
, sizeof x_ehdr
);
1691 bfd_set_error (bfd_error_system_call
);
1696 /* Now check to see if we have a valid ELF file, and one that BFD can
1697 make use of. The magic number must match, the address size ('class')
1698 and byte-swapping must match our XVEC entry. */
1700 if (! elf_file_p (&x_ehdr
)
1701 || x_ehdr
.e_ident
[EI_VERSION
] != EV_CURRENT
1702 || x_ehdr
.e_ident
[EI_CLASS
] != ELFCLASS
)
1704 bfd_set_error (bfd_error_wrong_format
);
1708 /* Check that file's byte order matches xvec's */
1709 switch (x_ehdr
.e_ident
[EI_DATA
])
1711 case ELFDATA2MSB
: /* Big-endian */
1712 if (! bfd_header_big_endian (templ
))
1714 bfd_set_error (bfd_error_wrong_format
);
1718 case ELFDATA2LSB
: /* Little-endian */
1719 if (! bfd_header_little_endian (templ
))
1721 bfd_set_error (bfd_error_wrong_format
);
1725 case ELFDATANONE
: /* No data encoding specified */
1726 default: /* Unknown data encoding specified */
1727 bfd_set_error (bfd_error_wrong_format
);
1731 elf_swap_ehdr_in (templ
, &x_ehdr
, &i_ehdr
);
1733 /* The file header tells where to find the program headers.
1734 These are what we use to actually choose what to read. */
1736 if (i_ehdr
.e_phentsize
!= sizeof (Elf_External_Phdr
) || i_ehdr
.e_phnum
== 0)
1738 bfd_set_error (bfd_error_wrong_format
);
1742 if (_bfd_mul_overflow (i_ehdr
.e_phnum
,
1743 sizeof (*x_phdrs
) + sizeof (*i_phdrs
), &amt
))
1745 bfd_set_error (bfd_error_file_too_big
);
1748 x_phdrs
= (Elf_External_Phdr
*) bfd_malloc (amt
);
1749 if (x_phdrs
== NULL
)
1751 err
= target_read_memory (ehdr_vma
+ i_ehdr
.e_phoff
, (bfd_byte
*) x_phdrs
,
1752 i_ehdr
.e_phnum
* sizeof x_phdrs
[0]);
1756 bfd_set_error (bfd_error_system_call
);
1760 i_phdrs
= (Elf_Internal_Phdr
*) &x_phdrs
[i_ehdr
.e_phnum
];
1766 for (i
= 0; i
< i_ehdr
.e_phnum
; ++i
)
1768 elf_swap_phdr_in (templ
, &x_phdrs
[i
], &i_phdrs
[i
]);
1769 if (i_phdrs
[i
].p_type
== PT_LOAD
)
1771 bfd_vma segment_end
= i_phdrs
[i
].p_offset
+ i_phdrs
[i
].p_filesz
;
1773 if (segment_end
> high_offset
)
1775 high_offset
= segment_end
;
1776 last_phdr
= &i_phdrs
[i
];
1779 /* If this program header covers offset zero, where the file
1780 header sits, then we can figure out the loadbase. */
1781 if (first_phdr
== NULL
)
1783 bfd_vma p_offset
= i_phdrs
[i
].p_offset
; /* Octets. */
1784 bfd_vma p_vaddr
= i_phdrs
[i
].p_vaddr
; /* Octets. */
1786 if (i_phdrs
[i
].p_align
> 1)
1788 p_offset
&= -(i_phdrs
[i
].p_align
* opb
);
1789 p_vaddr
&= -(i_phdrs
[i
].p_align
* opb
);
1793 loadbase
= ehdr_vma
- p_vaddr
/ opb
;
1794 first_phdr
= &i_phdrs
[i
];
1799 if (high_offset
== 0)
1801 /* There were no PT_LOAD segments, so we don't have anything to read. */
1803 bfd_set_error (bfd_error_wrong_format
);
1808 if (i_ehdr
.e_shoff
!= 0 && i_ehdr
.e_shnum
!= 0 && i_ehdr
.e_shentsize
!= 0)
1810 shdr_end
= i_ehdr
.e_shoff
+ i_ehdr
.e_shnum
* i_ehdr
.e_shentsize
;
1812 if (last_phdr
->p_filesz
!= last_phdr
->p_memsz
)
1814 /* If the last PT_LOAD header has a bss area then ld.so will
1815 have cleared anything past p_filesz, zapping the section
1818 else if (size
>= shdr_end
)
1822 bfd_vma page_size
= get_elf_backend_data (templ
)->minpagesize
;
1823 bfd_vma segment_end
= last_phdr
->p_offset
+ last_phdr
->p_filesz
;
1825 /* Assume we loaded full pages, allowing us to sometimes see
1827 if (page_size
> 1 && shdr_end
> segment_end
)
1829 bfd_vma page_end
= (segment_end
+ page_size
- 1) & -page_size
;
1831 if (page_end
>= shdr_end
)
1832 /* Whee, section headers covered. */
1833 high_offset
= shdr_end
;
1838 /* Now we know the size of the whole image we want read in. */
1839 contents
= (bfd_byte
*) bfd_zmalloc (high_offset
);
1840 if (contents
== NULL
)
1846 for (i
= 0; i
< i_ehdr
.e_phnum
; ++i
)
1847 if (i_phdrs
[i
].p_type
== PT_LOAD
)
1849 bfd_vma start
= i_phdrs
[i
].p_offset
; /* Octets. */
1850 bfd_vma end
= start
+ i_phdrs
[i
].p_filesz
; /* Octets. */
1851 bfd_vma vaddr
= i_phdrs
[i
].p_vaddr
; /* Octets. */
1853 /* Extend the beginning of the first pt_load to cover file
1854 header and program headers, if we proved earlier that its
1855 aligned offset is 0. */
1856 if (first_phdr
== &i_phdrs
[i
])
1861 /* Extend the end of the last pt_load to cover section headers. */
1862 if (last_phdr
== &i_phdrs
[i
])
1864 err
= target_read_memory (loadbase
+ vaddr
/ opb
,
1865 contents
+ start
, end
- start
);
1870 bfd_set_error (bfd_error_system_call
);
1877 /* If the segments visible in memory didn't include the section headers,
1878 then clear them from the file header. */
1879 if (high_offset
< shdr_end
)
1881 memset (&x_ehdr
.e_shoff
, 0, sizeof x_ehdr
.e_shoff
);
1882 memset (&x_ehdr
.e_shnum
, 0, sizeof x_ehdr
.e_shnum
);
1883 memset (&x_ehdr
.e_shstrndx
, 0, sizeof x_ehdr
.e_shstrndx
);
1886 /* This will normally have been in the first PT_LOAD segment. But it
1887 conceivably could be missing, and we might have just changed it. */
1888 memcpy (contents
, &x_ehdr
, sizeof x_ehdr
);
1890 /* Now we have a memory image of the ELF file contents. Make a BFD. */
1891 bim
= (struct bfd_in_memory
*) bfd_malloc (sizeof (struct bfd_in_memory
));
1897 filename
= bfd_strdup ("<in-memory>");
1898 if (filename
== NULL
)
1904 nbfd
= _bfd_new_bfd ();
1912 nbfd
->filename
= filename
;
1913 nbfd
->xvec
= templ
->xvec
;
1914 bim
->size
= high_offset
;
1915 bim
->buffer
= contents
;
1916 nbfd
->iostream
= bim
;
1917 nbfd
->flags
= BFD_IN_MEMORY
;
1918 nbfd
->iovec
= &_bfd_memory_iovec
;
1920 nbfd
->direction
= read_direction
;
1921 nbfd
->mtime
= time (NULL
);
1922 nbfd
->mtime_set
= TRUE
;
1925 *loadbasep
= loadbase
;
1929 /* Function for ELF_R_INFO. */
1932 NAME(elf
,r_info
) (bfd_vma sym
, bfd_vma type
)
1934 return ELF_R_INFO (sym
, type
);
1937 /* Function for ELF_R_SYM. */
1940 NAME(elf
,r_sym
) (bfd_vma r_info
)
1942 return ELF_R_SYM (r_info
);
1945 #include "elfcore.h"
1947 /* Size-dependent data and functions. */
1948 const struct elf_size_info
NAME(_bfd_elf
,size_info
) = {
1949 sizeof (Elf_External_Ehdr
),
1950 sizeof (Elf_External_Phdr
),
1951 sizeof (Elf_External_Shdr
),
1952 sizeof (Elf_External_Rel
),
1953 sizeof (Elf_External_Rela
),
1954 sizeof (Elf_External_Sym
),
1955 sizeof (Elf_External_Dyn
),
1956 sizeof (Elf_External_Note
),
1959 ARCH_SIZE
, LOG_FILE_ALIGN
,
1960 ELFCLASS
, EV_CURRENT
,
1961 elf_write_out_phdrs
,
1962 elf_write_shdrs_and_ehdr
,
1963 elf_checksum_contents
,
1966 elf_swap_symbol_out
,
1967 elf_slurp_reloc_table
,
1968 elf_slurp_symbol_table
,