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 (i_ehdrp
->e_shnum
> ((bfd_size_type
) -1) / sizeof (*i_shdrp
))
693 goto got_wrong_format_error
;
695 i_shdrp
= (Elf_Internal_Shdr
*) bfd_alloc2 (abfd
, i_ehdrp
->e_shnum
,
699 num_sec
= i_ehdrp
->e_shnum
;
700 elf_numsections (abfd
) = num_sec
;
701 elf_elfsections (abfd
)
702 = (Elf_Internal_Shdr
**) bfd_alloc2 (abfd
, num_sec
, sizeof (i_shdrp
));
703 if (!elf_elfsections (abfd
))
706 memcpy (i_shdrp
, &i_shdr
, sizeof (*i_shdrp
));
707 for (shdrp
= i_shdrp
, shindex
= 0; shindex
< num_sec
; shindex
++)
708 elf_elfsections (abfd
)[shindex
] = shdrp
++;
710 /* Read in the rest of the section header table and convert it
712 for (shindex
= 1; shindex
< i_ehdrp
->e_shnum
; shindex
++)
714 if (bfd_bread (&x_shdr
, sizeof x_shdr
, abfd
) != sizeof (x_shdr
))
716 elf_swap_shdr_in (abfd
, &x_shdr
, i_shdrp
+ shindex
);
718 /* Sanity check sh_link and sh_info. */
719 if (i_shdrp
[shindex
].sh_link
>= num_sec
)
721 /* PR 10478: Accept Solaris binaries with a sh_link
722 field set to SHN_BEFORE or SHN_AFTER. */
723 switch (ebd
->elf_machine_code
)
732 if (i_shdrp
[shindex
].sh_link
== (SHN_LORESERVE
& 0xffff) /* SHN_BEFORE */
733 || i_shdrp
[shindex
].sh_link
== ((SHN_LORESERVE
+ 1) & 0xffff) /* SHN_AFTER */)
735 /* Otherwise fall through. */
737 goto got_wrong_format_error
;
741 if (((i_shdrp
[shindex
].sh_flags
& SHF_INFO_LINK
)
742 || i_shdrp
[shindex
].sh_type
== SHT_RELA
743 || i_shdrp
[shindex
].sh_type
== SHT_REL
)
744 && i_shdrp
[shindex
].sh_info
>= num_sec
)
745 goto got_wrong_format_error
;
747 /* If the section is loaded, but not page aligned, clear
749 if (i_shdrp
[shindex
].sh_size
!= 0
750 && (i_shdrp
[shindex
].sh_flags
& SHF_ALLOC
) != 0
751 && i_shdrp
[shindex
].sh_type
!= SHT_NOBITS
752 && (((i_shdrp
[shindex
].sh_addr
- i_shdrp
[shindex
].sh_offset
)
755 abfd
->flags
&= ~D_PAGED
;
758 if (i_ehdrp
->e_shstrndx
>= elf_numsections (abfd
)
759 || i_shdrp
[i_ehdrp
->e_shstrndx
].sh_type
!= SHT_STRTAB
)
762 We used to just goto got_wrong_format_error here
763 but there are binaries in existance for which this test
764 will prevent the binutils from working with them at all.
765 So we are kind, and reset the string index value to 0
766 so that at least some processing can be done. */
767 i_ehdrp
->e_shstrndx
= SHN_UNDEF
;
769 (_("warning: %pB has a corrupt string table index - ignoring"),
773 else if (i_ehdrp
->e_shstrndx
!= SHN_UNDEF
)
774 goto got_wrong_format_error
;
776 /* Read in the program headers. */
777 if (i_ehdrp
->e_phnum
== 0)
778 elf_tdata (abfd
)->phdr
= NULL
;
781 Elf_Internal_Phdr
*i_phdr
;
786 if (i_ehdrp
->e_phnum
> ((bfd_size_type
) -1) / sizeof (*i_phdr
))
787 goto got_wrong_format_error
;
789 /* Check for a corrupt input file with an impossibly large number
790 of program headers. */
791 filesize
= bfd_get_file_size (abfd
);
793 && i_ehdrp
->e_phnum
> filesize
/ sizeof (Elf_External_Phdr
))
794 goto got_wrong_format_error
;
795 elf_tdata (abfd
)->phdr
796 = (Elf_Internal_Phdr
*) bfd_alloc2 (abfd
, i_ehdrp
->e_phnum
,
798 if (elf_tdata (abfd
)->phdr
== NULL
)
800 if (bfd_seek (abfd
, (file_ptr
) i_ehdrp
->e_phoff
, SEEK_SET
) != 0)
802 i_phdr
= elf_tdata (abfd
)->phdr
;
803 for (i
= 0; i
< i_ehdrp
->e_phnum
; i
++, i_phdr
++)
805 Elf_External_Phdr x_phdr
;
807 if (bfd_bread (&x_phdr
, sizeof x_phdr
, abfd
) != sizeof x_phdr
)
809 elf_swap_phdr_in (abfd
, &x_phdr
, i_phdr
);
813 if (i_ehdrp
->e_shstrndx
!= 0 && i_ehdrp
->e_shoff
!= 0)
815 unsigned int num_sec
;
817 /* Once all of the section headers have been read and converted, we
818 can start processing them. Note that the first section header is
819 a dummy placeholder entry, so we ignore it. */
820 num_sec
= elf_numsections (abfd
);
821 for (shindex
= 1; shindex
< num_sec
; shindex
++)
822 if (!bfd_section_from_shdr (abfd
, shindex
))
825 /* Set up ELF sections for SHF_GROUP and SHF_LINK_ORDER. */
826 if (! _bfd_elf_setup_sections (abfd
))
827 goto got_wrong_format_error
;
830 /* Let the backend double check the format and override global
832 if (ebd
->elf_backend_object_p
)
834 if (! (*ebd
->elf_backend_object_p
) (abfd
))
835 goto got_wrong_format_error
;
838 /* Remember the entry point specified in the ELF file header. */
839 bfd_set_start_address (abfd
, i_ehdrp
->e_entry
);
841 /* If we have created any reloc sections that are associated with
842 debugging sections, mark the reloc sections as debugging as well. */
843 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
845 if ((elf_section_data (s
)->this_hdr
.sh_type
== SHT_REL
846 || elf_section_data (s
)->this_hdr
.sh_type
== SHT_RELA
)
847 && elf_section_data (s
)->this_hdr
.sh_info
> 0)
849 unsigned long targ_index
;
852 targ_index
= elf_section_data (s
)->this_hdr
.sh_info
;
853 targ_sec
= bfd_section_from_elf_index (abfd
, targ_index
);
855 && (targ_sec
->flags
& SEC_DEBUGGING
) != 0)
856 s
->flags
|= SEC_DEBUGGING
;
861 got_wrong_format_error
:
862 bfd_set_error (bfd_error_wrong_format
);
868 /* ELF .o/exec file writing */
870 /* Write out the relocs. */
873 elf_write_relocs (bfd
*abfd
, asection
*sec
, void *data
)
875 bfd_boolean
*failedp
= (bfd_boolean
*) data
;
876 Elf_Internal_Shdr
*rela_hdr
;
878 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
885 /* If we have already failed, don't do anything. */
889 if ((sec
->flags
& SEC_RELOC
) == 0)
892 /* The linker backend writes the relocs out itself, and sets the
893 reloc_count field to zero to inhibit writing them here. Also,
894 sometimes the SEC_RELOC flag gets set even when there aren't any
896 if (sec
->reloc_count
== 0)
899 /* If we have opened an existing file for update, reloc_count may be
900 set even though we are not linking. In that case we have nothing
902 if (sec
->orelocation
== NULL
)
905 rela_hdr
= elf_section_data (sec
)->rela
.hdr
;
906 if (rela_hdr
== NULL
)
907 rela_hdr
= elf_section_data (sec
)->rel
.hdr
;
909 rela_hdr
->sh_size
= rela_hdr
->sh_entsize
* sec
->reloc_count
;
910 rela_hdr
->contents
= (unsigned char *) bfd_alloc2 (abfd
, sec
->reloc_count
,
911 rela_hdr
->sh_entsize
);
912 if (rela_hdr
->contents
== NULL
)
918 /* Figure out whether the relocations are RELA or REL relocations. */
919 if (rela_hdr
->sh_type
== SHT_RELA
)
921 swap_out
= elf_swap_reloca_out
;
922 extsize
= sizeof (Elf_External_Rela
);
924 else if (rela_hdr
->sh_type
== SHT_REL
)
926 swap_out
= elf_swap_reloc_out
;
927 extsize
= sizeof (Elf_External_Rel
);
930 /* Every relocation section should be either an SHT_RELA or an
934 /* The address of an ELF reloc is section relative for an object
935 file, and absolute for an executable file or shared library.
936 The address of a BFD reloc is always section relative. */
938 if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
939 addr_offset
= sec
->vma
;
941 /* orelocation has the data, reloc_count has the count... */
944 dst_rela
= rela_hdr
->contents
;
946 for (idx
= 0; idx
< sec
->reloc_count
; idx
++, dst_rela
+= extsize
)
948 Elf_Internal_Rela src_rela
;
953 ptr
= sec
->orelocation
[idx
];
954 sym
= *ptr
->sym_ptr_ptr
;
957 else if (bfd_is_abs_section (sym
->section
) && sym
->value
== 0)
962 n
= _bfd_elf_symbol_from_bfd_symbol (abfd
, &sym
);
971 if ((*ptr
->sym_ptr_ptr
)->the_bfd
!= NULL
972 && (*ptr
->sym_ptr_ptr
)->the_bfd
->xvec
!= abfd
->xvec
973 && ! _bfd_elf_validate_reloc (abfd
, ptr
))
979 if (ptr
->howto
== NULL
)
985 src_rela
.r_offset
= ptr
->address
+ addr_offset
;
986 src_rela
.r_info
= ELF_R_INFO (n
, ptr
->howto
->type
);
987 src_rela
.r_addend
= ptr
->addend
;
988 (*swap_out
) (abfd
, &src_rela
, dst_rela
);
992 /* Write out the program headers. */
995 elf_write_out_phdrs (bfd
*abfd
,
996 const Elf_Internal_Phdr
*phdr
,
1001 Elf_External_Phdr extphdr
;
1003 elf_swap_phdr_out (abfd
, phdr
, &extphdr
);
1004 if (bfd_bwrite (&extphdr
, sizeof (Elf_External_Phdr
), abfd
)
1005 != sizeof (Elf_External_Phdr
))
1012 /* Write out the section headers and the ELF file header. */
1015 elf_write_shdrs_and_ehdr (bfd
*abfd
)
1017 Elf_External_Ehdr x_ehdr
; /* Elf file header, external form */
1018 Elf_Internal_Ehdr
*i_ehdrp
; /* Elf file header, internal form */
1019 Elf_External_Shdr
*x_shdrp
; /* Section header table, external form */
1020 Elf_Internal_Shdr
**i_shdrp
; /* Section header table, internal form */
1024 i_ehdrp
= elf_elfheader (abfd
);
1025 i_shdrp
= elf_elfsections (abfd
);
1027 /* swap the header before spitting it out... */
1030 elf_debug_file (i_ehdrp
);
1032 elf_swap_ehdr_out (abfd
, i_ehdrp
, &x_ehdr
);
1033 amt
= sizeof (x_ehdr
);
1034 if (bfd_seek (abfd
, (file_ptr
) 0, SEEK_SET
) != 0
1035 || bfd_bwrite (&x_ehdr
, amt
, abfd
) != amt
)
1038 /* Some fields in the first section header handle overflow of ehdr
1040 if (i_ehdrp
->e_phnum
>= PN_XNUM
)
1041 i_shdrp
[0]->sh_info
= i_ehdrp
->e_phnum
;
1042 if (i_ehdrp
->e_shnum
>= (SHN_LORESERVE
& 0xffff))
1043 i_shdrp
[0]->sh_size
= i_ehdrp
->e_shnum
;
1044 if (i_ehdrp
->e_shstrndx
>= (SHN_LORESERVE
& 0xffff))
1045 i_shdrp
[0]->sh_link
= i_ehdrp
->e_shstrndx
;
1047 /* at this point we've concocted all the ELF sections... */
1048 x_shdrp
= (Elf_External_Shdr
*) bfd_alloc2 (abfd
, i_ehdrp
->e_shnum
,
1053 for (count
= 0; count
< i_ehdrp
->e_shnum
; i_shdrp
++, count
++)
1056 elf_debug_section (count
, *i_shdrp
);
1058 elf_swap_shdr_out (abfd
, *i_shdrp
, x_shdrp
+ count
);
1060 amt
= (bfd_size_type
) i_ehdrp
->e_shnum
* sizeof (*x_shdrp
);
1061 if (bfd_seek (abfd
, (file_ptr
) i_ehdrp
->e_shoff
, SEEK_SET
) != 0
1062 || bfd_bwrite (x_shdrp
, amt
, abfd
) != amt
)
1065 /* need to dump the string table too... */
1071 elf_checksum_contents (bfd
*abfd
,
1072 void (*process
) (const void *, size_t, void *),
1075 Elf_Internal_Ehdr
*i_ehdrp
= elf_elfheader (abfd
);
1076 Elf_Internal_Shdr
**i_shdrp
= elf_elfsections (abfd
);
1077 Elf_Internal_Phdr
*i_phdrp
= elf_tdata (abfd
)->phdr
;
1078 unsigned int count
, num
;
1081 Elf_External_Ehdr x_ehdr
;
1082 Elf_Internal_Ehdr i_ehdr
;
1085 i_ehdr
.e_phoff
= i_ehdr
.e_shoff
= 0;
1086 elf_swap_ehdr_out (abfd
, &i_ehdr
, &x_ehdr
);
1087 (*process
) (&x_ehdr
, sizeof x_ehdr
, arg
);
1090 num
= i_ehdrp
->e_phnum
;
1091 for (count
= 0; count
< num
; count
++)
1093 Elf_External_Phdr x_phdr
;
1094 elf_swap_phdr_out (abfd
, &i_phdrp
[count
], &x_phdr
);
1095 (*process
) (&x_phdr
, sizeof x_phdr
, arg
);
1098 num
= elf_numsections (abfd
);
1099 for (count
= 0; count
< num
; count
++)
1101 Elf_Internal_Shdr i_shdr
;
1102 Elf_External_Shdr x_shdr
;
1103 bfd_byte
*contents
, *free_contents
;
1105 i_shdr
= *i_shdrp
[count
];
1106 i_shdr
.sh_offset
= 0;
1108 elf_swap_shdr_out (abfd
, &i_shdr
, &x_shdr
);
1109 (*process
) (&x_shdr
, sizeof x_shdr
, arg
);
1111 /* Process the section's contents, if it has some.
1112 PR ld/12451: Read them in if necessary. */
1113 if (i_shdr
.sh_type
== SHT_NOBITS
)
1115 free_contents
= NULL
;
1116 contents
= i_shdr
.contents
;
1117 if (contents
== NULL
)
1121 sec
= bfd_section_from_elf_index (abfd
, count
);
1124 contents
= sec
->contents
;
1125 if (contents
== NULL
)
1127 /* Force rereading from file. */
1128 sec
->flags
&= ~SEC_IN_MEMORY
;
1129 if (!bfd_malloc_and_get_section (abfd
, sec
, &free_contents
))
1131 contents
= free_contents
;
1135 if (contents
!= NULL
)
1137 (*process
) (contents
, i_shdr
.sh_size
, arg
);
1138 if (free_contents
!= NULL
)
1139 free (free_contents
);
1147 elf_slurp_symbol_table (bfd
*abfd
, asymbol
**symptrs
, bfd_boolean dynamic
)
1149 Elf_Internal_Shdr
*hdr
;
1150 Elf_Internal_Shdr
*verhdr
;
1151 unsigned long symcount
; /* Number of external ELF symbols */
1152 elf_symbol_type
*sym
; /* Pointer to current bfd symbol */
1153 elf_symbol_type
*symbase
; /* Buffer for generated bfd symbols */
1154 Elf_Internal_Sym
*isym
;
1155 Elf_Internal_Sym
*isymend
;
1156 Elf_Internal_Sym
*isymbuf
= NULL
;
1157 Elf_External_Versym
*xver
;
1158 Elf_External_Versym
*xverbuf
= NULL
;
1159 const struct elf_backend_data
*ebd
;
1161 /* Read each raw ELF symbol, converting from external ELF form to
1162 internal ELF form, and then using the information to create a
1163 canonical bfd symbol table entry.
1165 Note that we allocate the initial bfd canonical symbol buffer
1166 based on a one-to-one mapping of the ELF symbols to canonical
1167 symbols. We actually use all the ELF symbols, so there will be no
1168 space left over at the end. When we have all the symbols, we
1169 build the caller's pointer vector. */
1173 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1178 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
1179 if (elf_dynversym (abfd
) == 0)
1182 verhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
1183 if ((elf_dynverdef (abfd
) != 0
1184 && elf_tdata (abfd
)->verdef
== NULL
)
1185 || (elf_dynverref (abfd
) != 0
1186 && elf_tdata (abfd
)->verref
== NULL
))
1188 if (!_bfd_elf_slurp_version_tables (abfd
, FALSE
))
1193 ebd
= get_elf_backend_data (abfd
);
1194 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
1196 sym
= symbase
= NULL
;
1199 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, symcount
, 0,
1201 if (isymbuf
== NULL
)
1204 symbase
= (elf_symbol_type
*) bfd_zalloc2 (abfd
, symcount
,
1205 sizeof (elf_symbol_type
));
1206 if (symbase
== (elf_symbol_type
*) NULL
)
1209 /* Read the raw ELF version symbol information. */
1211 && verhdr
->sh_size
/ sizeof (Elf_External_Versym
) != symcount
)
1214 /* xgettext:c-format */
1215 (_("%pB: version count (%" PRId64
")"
1216 " does not match symbol count (%ld)"),
1218 (int64_t) (verhdr
->sh_size
/ sizeof (Elf_External_Versym
)),
1221 /* Slurp in the symbols without the version information,
1222 since that is more helpful than just quitting. */
1228 if (bfd_seek (abfd
, verhdr
->sh_offset
, SEEK_SET
) != 0)
1231 xverbuf
= (Elf_External_Versym
*) bfd_malloc (verhdr
->sh_size
);
1232 if (xverbuf
== NULL
&& verhdr
->sh_size
!= 0)
1235 if (bfd_bread (xverbuf
, verhdr
->sh_size
, abfd
) != verhdr
->sh_size
)
1239 /* Skip first symbol, which is a null dummy. */
1243 isymend
= isymbuf
+ symcount
;
1244 for (isym
= isymbuf
+ 1, sym
= symbase
; isym
< isymend
; isym
++, sym
++)
1246 memcpy (&sym
->internal_elf_sym
, isym
, sizeof (Elf_Internal_Sym
));
1248 sym
->symbol
.the_bfd
= abfd
;
1249 sym
->symbol
.name
= bfd_elf_sym_name (abfd
, hdr
, isym
, NULL
);
1250 sym
->symbol
.value
= isym
->st_value
;
1252 if (isym
->st_shndx
== SHN_UNDEF
)
1254 sym
->symbol
.section
= bfd_und_section_ptr
;
1256 else if (isym
->st_shndx
== SHN_ABS
)
1258 sym
->symbol
.section
= bfd_abs_section_ptr
;
1260 else if (isym
->st_shndx
== SHN_COMMON
)
1262 sym
->symbol
.section
= bfd_com_section_ptr
;
1263 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
1265 asection
*xc
= bfd_get_section_by_name (abfd
, "COMMON");
1269 flagword flags
= (SEC_ALLOC
| SEC_IS_COMMON
| SEC_KEEP
1271 xc
= bfd_make_section_with_flags (abfd
, "COMMON", flags
);
1275 sym
->symbol
.section
= xc
;
1277 /* Elf puts the alignment into the `value' field, and
1278 the size into the `size' field. BFD wants to see the
1279 size in the value field, and doesn't care (at the
1280 moment) about the alignment. */
1281 sym
->symbol
.value
= isym
->st_size
;
1286 = bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
1287 if (sym
->symbol
.section
== NULL
)
1289 /* This symbol is in a section for which we did not
1290 create a BFD section. Just use bfd_abs_section,
1291 although it is wrong. FIXME. */
1292 sym
->symbol
.section
= bfd_abs_section_ptr
;
1296 /* If this is a relocatable file, then the symbol value is
1297 already section relative. */
1298 if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1299 sym
->symbol
.value
-= sym
->symbol
.section
->vma
;
1301 switch (ELF_ST_BIND (isym
->st_info
))
1304 sym
->symbol
.flags
|= BSF_LOCAL
;
1307 if (isym
->st_shndx
!= SHN_UNDEF
&& isym
->st_shndx
!= SHN_COMMON
)
1308 sym
->symbol
.flags
|= BSF_GLOBAL
;
1311 sym
->symbol
.flags
|= BSF_WEAK
;
1313 case STB_GNU_UNIQUE
:
1314 sym
->symbol
.flags
|= BSF_GNU_UNIQUE
;
1318 switch (ELF_ST_TYPE (isym
->st_info
))
1321 sym
->symbol
.flags
|= BSF_SECTION_SYM
| BSF_DEBUGGING
;
1324 sym
->symbol
.flags
|= BSF_FILE
| BSF_DEBUGGING
;
1327 sym
->symbol
.flags
|= BSF_FUNCTION
;
1330 /* FIXME: Do we have to put the size field into the value field
1331 as we do with symbols in SHN_COMMON sections (see above) ? */
1332 sym
->symbol
.flags
|= BSF_ELF_COMMON
;
1335 sym
->symbol
.flags
|= BSF_OBJECT
;
1338 sym
->symbol
.flags
|= BSF_THREAD_LOCAL
;
1341 sym
->symbol
.flags
|= BSF_RELC
;
1344 sym
->symbol
.flags
|= BSF_SRELC
;
1347 sym
->symbol
.flags
|= BSF_GNU_INDIRECT_FUNCTION
;
1352 sym
->symbol
.flags
|= BSF_DYNAMIC
;
1356 Elf_Internal_Versym iversym
;
1358 _bfd_elf_swap_versym_in (abfd
, xver
, &iversym
);
1359 sym
->version
= iversym
.vs_vers
;
1363 /* Do some backend-specific processing on this symbol. */
1364 if (ebd
->elf_backend_symbol_processing
)
1365 (*ebd
->elf_backend_symbol_processing
) (abfd
, &sym
->symbol
);
1369 /* Do some backend-specific processing on this symbol table. */
1370 if (ebd
->elf_backend_symbol_table_processing
)
1371 (*ebd
->elf_backend_symbol_table_processing
) (abfd
, symbase
, symcount
);
1373 /* We rely on the zalloc to clear out the final symbol entry. */
1375 symcount
= sym
- symbase
;
1377 /* Fill in the user's symbol pointer vector if needed. */
1385 *symptrs
++ = &sym
->symbol
;
1388 *symptrs
= 0; /* Final null pointer */
1391 if (xverbuf
!= NULL
)
1393 if (isymbuf
!= NULL
&& hdr
->contents
!= (unsigned char *) isymbuf
)
1398 if (xverbuf
!= NULL
)
1400 if (isymbuf
!= NULL
&& hdr
->contents
!= (unsigned char *) isymbuf
)
1405 /* Read relocations for ASECT from REL_HDR. There are RELOC_COUNT of
1409 elf_slurp_reloc_table_from_section (bfd
*abfd
,
1411 Elf_Internal_Shdr
*rel_hdr
,
1412 bfd_size_type reloc_count
,
1415 bfd_boolean dynamic
)
1417 const struct elf_backend_data
* const ebd
= get_elf_backend_data (abfd
);
1418 void *allocated
= NULL
;
1419 bfd_byte
*native_relocs
;
1423 unsigned int symcount
;
1425 allocated
= bfd_malloc (rel_hdr
->sh_size
);
1426 if (allocated
== NULL
)
1429 if (bfd_seek (abfd
, rel_hdr
->sh_offset
, SEEK_SET
) != 0
1430 || (bfd_bread (allocated
, rel_hdr
->sh_size
, abfd
)
1431 != rel_hdr
->sh_size
))
1434 native_relocs
= (bfd_byte
*) allocated
;
1436 entsize
= rel_hdr
->sh_entsize
;
1437 BFD_ASSERT (entsize
== sizeof (Elf_External_Rel
)
1438 || entsize
== sizeof (Elf_External_Rela
));
1441 symcount
= bfd_get_dynamic_symcount (abfd
);
1443 symcount
= bfd_get_symcount (abfd
);
1445 for (i
= 0, relent
= relents
;
1447 i
++, relent
++, native_relocs
+= entsize
)
1450 Elf_Internal_Rela rela
;
1452 if (entsize
== sizeof (Elf_External_Rela
))
1453 elf_swap_reloca_in (abfd
, native_relocs
, &rela
);
1455 elf_swap_reloc_in (abfd
, native_relocs
, &rela
);
1457 /* The address of an ELF reloc is section relative for an object
1458 file, and absolute for an executable file or shared library.
1459 The address of a normal BFD reloc is always section relative,
1460 and the address of a dynamic reloc is absolute.. */
1461 if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) == 0 || dynamic
)
1462 relent
->address
= rela
.r_offset
;
1464 relent
->address
= rela
.r_offset
- asect
->vma
;
1466 if (ELF_R_SYM (rela
.r_info
) == STN_UNDEF
)
1467 /* FIXME: This and the error case below mean that we have a
1468 symbol on relocs that is not elf_symbol_type. */
1469 relent
->sym_ptr_ptr
= bfd_abs_section_ptr
->symbol_ptr_ptr
;
1470 else if (ELF_R_SYM (rela
.r_info
) > symcount
)
1473 /* xgettext:c-format */
1474 (_("%pB(%pA): relocation %d has invalid symbol index %ld"),
1475 abfd
, asect
, i
, (long) ELF_R_SYM (rela
.r_info
));
1476 bfd_set_error (bfd_error_bad_value
);
1477 relent
->sym_ptr_ptr
= bfd_abs_section_ptr
->symbol_ptr_ptr
;
1483 ps
= symbols
+ ELF_R_SYM (rela
.r_info
) - 1;
1485 relent
->sym_ptr_ptr
= ps
;
1488 relent
->addend
= rela
.r_addend
;
1490 if ((entsize
== sizeof (Elf_External_Rela
)
1491 && ebd
->elf_info_to_howto
!= NULL
)
1492 || ebd
->elf_info_to_howto_rel
== NULL
)
1493 res
= ebd
->elf_info_to_howto (abfd
, relent
, &rela
);
1495 res
= ebd
->elf_info_to_howto_rel (abfd
, relent
, &rela
);
1497 if (! res
|| relent
->howto
== NULL
)
1501 if (allocated
!= NULL
)
1506 if (allocated
!= NULL
)
1511 /* Read in and swap the external relocs. */
1514 elf_slurp_reloc_table (bfd
*abfd
,
1517 bfd_boolean dynamic
)
1519 struct bfd_elf_section_data
* const d
= elf_section_data (asect
);
1520 Elf_Internal_Shdr
*rel_hdr
;
1521 Elf_Internal_Shdr
*rel_hdr2
;
1522 bfd_size_type reloc_count
;
1523 bfd_size_type reloc_count2
;
1526 if (asect
->relocation
!= NULL
)
1531 if ((asect
->flags
& SEC_RELOC
) == 0
1532 || asect
->reloc_count
== 0)
1535 rel_hdr
= d
->rel
.hdr
;
1536 reloc_count
= rel_hdr
? NUM_SHDR_ENTRIES (rel_hdr
) : 0;
1537 rel_hdr2
= d
->rela
.hdr
;
1538 reloc_count2
= rel_hdr2
? NUM_SHDR_ENTRIES (rel_hdr2
) : 0;
1540 /* PR 17512: file: 0b4f81b7. */
1541 if (asect
->reloc_count
!= reloc_count
+ reloc_count2
)
1543 BFD_ASSERT ((rel_hdr
&& asect
->rel_filepos
== rel_hdr
->sh_offset
)
1544 || (rel_hdr2
&& asect
->rel_filepos
== rel_hdr2
->sh_offset
));
1549 /* Note that ASECT->RELOC_COUNT tends not to be accurate in this
1550 case because relocations against this section may use the
1551 dynamic symbol table, and in that case bfd_section_from_shdr
1552 in elf.c does not update the RELOC_COUNT. */
1553 if (asect
->size
== 0)
1556 rel_hdr
= &d
->this_hdr
;
1557 reloc_count
= NUM_SHDR_ENTRIES (rel_hdr
);
1562 relents
= (arelent
*) bfd_alloc2 (abfd
, reloc_count
+ reloc_count2
,
1564 if (relents
== NULL
)
1568 && !elf_slurp_reloc_table_from_section (abfd
, asect
,
1569 rel_hdr
, reloc_count
,
1575 && !elf_slurp_reloc_table_from_section (abfd
, asect
,
1576 rel_hdr2
, reloc_count2
,
1577 relents
+ reloc_count
,
1581 asect
->relocation
= relents
;
1587 elf_debug_section (int num
, Elf_Internal_Shdr
*hdr
)
1589 fprintf (stderr
, "\nSection#%d '%s' 0x%.8lx\n", num
,
1590 hdr
->bfd_section
!= NULL
? hdr
->bfd_section
->name
: "",
1593 "sh_name = %ld\tsh_type = %ld\tsh_flags = %ld\n",
1594 (long) hdr
->sh_name
,
1595 (long) hdr
->sh_type
,
1596 (long) hdr
->sh_flags
);
1598 "sh_addr = %ld\tsh_offset = %ld\tsh_size = %ld\n",
1599 (long) hdr
->sh_addr
,
1600 (long) hdr
->sh_offset
,
1601 (long) hdr
->sh_size
);
1603 "sh_link = %ld\tsh_info = %ld\tsh_addralign = %ld\n",
1604 (long) hdr
->sh_link
,
1605 (long) hdr
->sh_info
,
1606 (long) hdr
->sh_addralign
);
1607 fprintf (stderr
, "sh_entsize = %ld\n",
1608 (long) hdr
->sh_entsize
);
1615 elf_debug_file (Elf_Internal_Ehdr
*ehdrp
)
1617 fprintf (stderr
, "e_entry = 0x%.8lx\n", (long) ehdrp
->e_entry
);
1618 fprintf (stderr
, "e_phoff = %ld\n", (long) ehdrp
->e_phoff
);
1619 fprintf (stderr
, "e_phnum = %ld\n", (long) ehdrp
->e_phnum
);
1620 fprintf (stderr
, "e_phentsize = %ld\n", (long) ehdrp
->e_phentsize
);
1621 fprintf (stderr
, "e_shoff = %ld\n", (long) ehdrp
->e_shoff
);
1622 fprintf (stderr
, "e_shnum = %ld\n", (long) ehdrp
->e_shnum
);
1623 fprintf (stderr
, "e_shentsize = %ld\n", (long) ehdrp
->e_shentsize
);
1627 /* Create a new BFD as if by bfd_openr. Rather than opening a file,
1628 reconstruct an ELF file by reading the segments out of remote
1629 memory based on the ELF file header at EHDR_VMA and the ELF program
1630 headers it points to. If non-zero, SIZE is the known extent of the
1631 object. If not null, *LOADBASEP is filled in with the difference
1632 between the VMAs from which the segments were read, and the VMAs
1633 the file headers (and hence BFD's idea of each section's VMA) put
1636 The function TARGET_READ_MEMORY is called to copy LEN bytes from
1637 the remote memory at target address VMA into the local buffer at
1638 MYADDR; it should return zero on success or an `errno' code on
1639 failure. TEMPL must be a BFD for a target with the word size and
1640 byte order found in the remote memory. */
1643 NAME(_bfd_elf
,bfd_from_remote_memory
)
1648 int (*target_read_memory
) (bfd_vma
, bfd_byte
*, bfd_size_type
))
1650 Elf_External_Ehdr x_ehdr
; /* Elf file header, external form */
1651 Elf_Internal_Ehdr i_ehdr
; /* Elf file header, internal form */
1652 Elf_External_Phdr
*x_phdrs
;
1653 Elf_Internal_Phdr
*i_phdrs
, *last_phdr
, *first_phdr
;
1655 struct bfd_in_memory
*bim
;
1659 bfd_vma high_offset
;
1664 /* Read in the ELF header in external format. */
1665 err
= target_read_memory (ehdr_vma
, (bfd_byte
*) &x_ehdr
, sizeof x_ehdr
);
1668 bfd_set_error (bfd_error_system_call
);
1673 /* Now check to see if we have a valid ELF file, and one that BFD can
1674 make use of. The magic number must match, the address size ('class')
1675 and byte-swapping must match our XVEC entry. */
1677 if (! elf_file_p (&x_ehdr
)
1678 || x_ehdr
.e_ident
[EI_VERSION
] != EV_CURRENT
1679 || x_ehdr
.e_ident
[EI_CLASS
] != ELFCLASS
)
1681 bfd_set_error (bfd_error_wrong_format
);
1685 /* Check that file's byte order matches xvec's */
1686 switch (x_ehdr
.e_ident
[EI_DATA
])
1688 case ELFDATA2MSB
: /* Big-endian */
1689 if (! bfd_header_big_endian (templ
))
1691 bfd_set_error (bfd_error_wrong_format
);
1695 case ELFDATA2LSB
: /* Little-endian */
1696 if (! bfd_header_little_endian (templ
))
1698 bfd_set_error (bfd_error_wrong_format
);
1702 case ELFDATANONE
: /* No data encoding specified */
1703 default: /* Unknown data encoding specified */
1704 bfd_set_error (bfd_error_wrong_format
);
1708 elf_swap_ehdr_in (templ
, &x_ehdr
, &i_ehdr
);
1710 /* The file header tells where to find the program headers.
1711 These are what we use to actually choose what to read. */
1713 if (i_ehdr
.e_phentsize
!= sizeof (Elf_External_Phdr
) || i_ehdr
.e_phnum
== 0)
1715 bfd_set_error (bfd_error_wrong_format
);
1720 = (Elf_External_Phdr
*) bfd_malloc2 (i_ehdr
.e_phnum
,
1721 sizeof (*x_phdrs
) + sizeof (*i_phdrs
));
1722 if (x_phdrs
== NULL
)
1724 err
= target_read_memory (ehdr_vma
+ i_ehdr
.e_phoff
, (bfd_byte
*) x_phdrs
,
1725 i_ehdr
.e_phnum
* sizeof x_phdrs
[0]);
1729 bfd_set_error (bfd_error_system_call
);
1733 i_phdrs
= (Elf_Internal_Phdr
*) &x_phdrs
[i_ehdr
.e_phnum
];
1739 for (i
= 0; i
< i_ehdr
.e_phnum
; ++i
)
1741 elf_swap_phdr_in (templ
, &x_phdrs
[i
], &i_phdrs
[i
]);
1742 if (i_phdrs
[i
].p_type
== PT_LOAD
)
1744 bfd_vma segment_end
= i_phdrs
[i
].p_offset
+ i_phdrs
[i
].p_filesz
;
1746 if (segment_end
> high_offset
)
1748 high_offset
= segment_end
;
1749 last_phdr
= &i_phdrs
[i
];
1752 /* If this program header covers offset zero, where the file
1753 header sits, then we can figure out the loadbase. */
1754 if (first_phdr
== NULL
)
1756 bfd_vma p_offset
= i_phdrs
[i
].p_offset
;
1757 bfd_vma p_vaddr
= i_phdrs
[i
].p_vaddr
;
1759 if (i_phdrs
[i
].p_align
> 1)
1761 p_offset
&= -i_phdrs
[i
].p_align
;
1762 p_vaddr
&= -i_phdrs
[i
].p_align
;
1766 loadbase
= ehdr_vma
- p_vaddr
;
1767 first_phdr
= &i_phdrs
[i
];
1772 if (high_offset
== 0)
1774 /* There were no PT_LOAD segments, so we don't have anything to read. */
1776 bfd_set_error (bfd_error_wrong_format
);
1781 if (i_ehdr
.e_shoff
!= 0 && i_ehdr
.e_shnum
!= 0 && i_ehdr
.e_shentsize
!= 0)
1783 shdr_end
= i_ehdr
.e_shoff
+ i_ehdr
.e_shnum
* i_ehdr
.e_shentsize
;
1785 if (last_phdr
->p_filesz
!= last_phdr
->p_memsz
)
1787 /* If the last PT_LOAD header has a bss area then ld.so will
1788 have cleared anything past p_filesz, zapping the section
1791 else if (size
>= shdr_end
)
1795 bfd_vma page_size
= get_elf_backend_data (templ
)->minpagesize
;
1796 bfd_vma segment_end
= last_phdr
->p_offset
+ last_phdr
->p_filesz
;
1798 /* Assume we loaded full pages, allowing us to sometimes see
1800 if (page_size
> 1 && shdr_end
> segment_end
)
1802 bfd_vma page_end
= (segment_end
+ page_size
- 1) & -page_size
;
1804 if (page_end
>= shdr_end
)
1805 /* Whee, section headers covered. */
1806 high_offset
= shdr_end
;
1811 /* Now we know the size of the whole image we want read in. */
1812 contents
= (bfd_byte
*) bfd_zmalloc (high_offset
);
1813 if (contents
== NULL
)
1819 for (i
= 0; i
< i_ehdr
.e_phnum
; ++i
)
1820 if (i_phdrs
[i
].p_type
== PT_LOAD
)
1822 bfd_vma start
= i_phdrs
[i
].p_offset
;
1823 bfd_vma end
= start
+ i_phdrs
[i
].p_filesz
;
1824 bfd_vma vaddr
= i_phdrs
[i
].p_vaddr
;
1826 /* Extend the beginning of the first pt_load to cover file
1827 header and program headers, if we proved earlier that its
1828 aligned offset is 0. */
1829 if (first_phdr
== &i_phdrs
[i
])
1834 /* Extend the end of the last pt_load to cover section headers. */
1835 if (last_phdr
== &i_phdrs
[i
])
1837 err
= target_read_memory (loadbase
+ vaddr
,
1838 contents
+ start
, end
- start
);
1843 bfd_set_error (bfd_error_system_call
);
1850 /* If the segments visible in memory didn't include the section headers,
1851 then clear them from the file header. */
1852 if (high_offset
< shdr_end
)
1854 memset (&x_ehdr
.e_shoff
, 0, sizeof x_ehdr
.e_shoff
);
1855 memset (&x_ehdr
.e_shnum
, 0, sizeof x_ehdr
.e_shnum
);
1856 memset (&x_ehdr
.e_shstrndx
, 0, sizeof x_ehdr
.e_shstrndx
);
1859 /* This will normally have been in the first PT_LOAD segment. But it
1860 conceivably could be missing, and we might have just changed it. */
1861 memcpy (contents
, &x_ehdr
, sizeof x_ehdr
);
1863 /* Now we have a memory image of the ELF file contents. Make a BFD. */
1864 bim
= (struct bfd_in_memory
*) bfd_malloc (sizeof (struct bfd_in_memory
));
1870 filename
= bfd_strdup ("<in-memory>");
1871 if (filename
== NULL
)
1877 nbfd
= _bfd_new_bfd ();
1885 nbfd
->filename
= filename
;
1886 nbfd
->xvec
= templ
->xvec
;
1887 bim
->size
= high_offset
;
1888 bim
->buffer
= contents
;
1889 nbfd
->iostream
= bim
;
1890 nbfd
->flags
= BFD_IN_MEMORY
;
1891 nbfd
->iovec
= &_bfd_memory_iovec
;
1893 nbfd
->direction
= read_direction
;
1894 nbfd
->mtime
= time (NULL
);
1895 nbfd
->mtime_set
= TRUE
;
1898 *loadbasep
= loadbase
;
1902 /* Function for ELF_R_INFO. */
1905 NAME(elf
,r_info
) (bfd_vma sym
, bfd_vma type
)
1907 return ELF_R_INFO (sym
, type
);
1910 /* Function for ELF_R_SYM. */
1913 NAME(elf
,r_sym
) (bfd_vma r_info
)
1915 return ELF_R_SYM (r_info
);
1918 #include "elfcore.h"
1920 /* Size-dependent data and functions. */
1921 const struct elf_size_info
NAME(_bfd_elf
,size_info
) = {
1922 sizeof (Elf_External_Ehdr
),
1923 sizeof (Elf_External_Phdr
),
1924 sizeof (Elf_External_Shdr
),
1925 sizeof (Elf_External_Rel
),
1926 sizeof (Elf_External_Rela
),
1927 sizeof (Elf_External_Sym
),
1928 sizeof (Elf_External_Dyn
),
1929 sizeof (Elf_External_Note
),
1932 ARCH_SIZE
, LOG_FILE_ALIGN
,
1933 ELFCLASS
, EV_CURRENT
,
1934 elf_write_out_phdrs
,
1935 elf_write_shdrs_and_ehdr
,
1936 elf_checksum_contents
,
1939 elf_swap_symbol_out
,
1940 elf_slurp_reloc_table
,
1941 elf_slurp_symbol_table
,