1 /* ELF executable support for BFD.
2 Copyright (C) 1991-2016 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 dst
->sh_link
= H_GET_32 (abfd
, src
->sh_link
);
318 dst
->sh_info
= H_GET_32 (abfd
, src
->sh_info
);
319 dst
->sh_addralign
= H_GET_WORD (abfd
, src
->sh_addralign
);
320 dst
->sh_entsize
= H_GET_WORD (abfd
, src
->sh_entsize
);
321 dst
->bfd_section
= NULL
;
322 dst
->contents
= NULL
;
325 /* Translate an ELF section header table entry in internal format into an
326 ELF section header table entry in external format. */
329 elf_swap_shdr_out (bfd
*abfd
,
330 const Elf_Internal_Shdr
*src
,
331 Elf_External_Shdr
*dst
)
333 /* note that all elements of dst are *arrays of unsigned char* already... */
334 H_PUT_32 (abfd
, src
->sh_name
, dst
->sh_name
);
335 H_PUT_32 (abfd
, src
->sh_type
, dst
->sh_type
);
336 H_PUT_WORD (abfd
, src
->sh_flags
, dst
->sh_flags
);
337 H_PUT_WORD (abfd
, src
->sh_addr
, dst
->sh_addr
);
338 H_PUT_WORD (abfd
, src
->sh_offset
, dst
->sh_offset
);
339 H_PUT_WORD (abfd
, src
->sh_size
, dst
->sh_size
);
340 H_PUT_32 (abfd
, src
->sh_link
, dst
->sh_link
);
341 H_PUT_32 (abfd
, src
->sh_info
, dst
->sh_info
);
342 H_PUT_WORD (abfd
, src
->sh_addralign
, dst
->sh_addralign
);
343 H_PUT_WORD (abfd
, src
->sh_entsize
, dst
->sh_entsize
);
346 /* Translate an ELF program header table entry in external format into an
347 ELF program header table entry in internal format. */
350 elf_swap_phdr_in (bfd
*abfd
,
351 const Elf_External_Phdr
*src
,
352 Elf_Internal_Phdr
*dst
)
354 int signed_vma
= get_elf_backend_data (abfd
)->sign_extend_vma
;
356 dst
->p_type
= H_GET_32 (abfd
, src
->p_type
);
357 dst
->p_flags
= H_GET_32 (abfd
, src
->p_flags
);
358 dst
->p_offset
= H_GET_WORD (abfd
, src
->p_offset
);
361 dst
->p_vaddr
= H_GET_SIGNED_WORD (abfd
, src
->p_vaddr
);
362 dst
->p_paddr
= H_GET_SIGNED_WORD (abfd
, src
->p_paddr
);
366 dst
->p_vaddr
= H_GET_WORD (abfd
, src
->p_vaddr
);
367 dst
->p_paddr
= H_GET_WORD (abfd
, src
->p_paddr
);
369 dst
->p_filesz
= H_GET_WORD (abfd
, src
->p_filesz
);
370 dst
->p_memsz
= H_GET_WORD (abfd
, src
->p_memsz
);
371 dst
->p_align
= H_GET_WORD (abfd
, src
->p_align
);
375 elf_swap_phdr_out (bfd
*abfd
,
376 const Elf_Internal_Phdr
*src
,
377 Elf_External_Phdr
*dst
)
379 const struct elf_backend_data
*bed
;
382 bed
= get_elf_backend_data (abfd
);
383 p_paddr
= bed
->want_p_paddr_set_to_zero
? 0 : src
->p_paddr
;
385 /* note that all elements of dst are *arrays of unsigned char* already... */
386 H_PUT_32 (abfd
, src
->p_type
, dst
->p_type
);
387 H_PUT_WORD (abfd
, src
->p_offset
, dst
->p_offset
);
388 H_PUT_WORD (abfd
, src
->p_vaddr
, dst
->p_vaddr
);
389 H_PUT_WORD (abfd
, p_paddr
, dst
->p_paddr
);
390 H_PUT_WORD (abfd
, src
->p_filesz
, dst
->p_filesz
);
391 H_PUT_WORD (abfd
, src
->p_memsz
, dst
->p_memsz
);
392 H_PUT_32 (abfd
, src
->p_flags
, dst
->p_flags
);
393 H_PUT_WORD (abfd
, src
->p_align
, dst
->p_align
);
396 /* Translate an ELF reloc from external format to internal format. */
398 elf_swap_reloc_in (bfd
*abfd
,
400 Elf_Internal_Rela
*dst
)
402 const Elf_External_Rel
*src
= (const Elf_External_Rel
*) s
;
403 dst
->r_offset
= H_GET_WORD (abfd
, src
->r_offset
);
404 dst
->r_info
= H_GET_WORD (abfd
, src
->r_info
);
409 elf_swap_reloca_in (bfd
*abfd
,
411 Elf_Internal_Rela
*dst
)
413 const Elf_External_Rela
*src
= (const Elf_External_Rela
*) s
;
414 dst
->r_offset
= H_GET_WORD (abfd
, src
->r_offset
);
415 dst
->r_info
= H_GET_WORD (abfd
, src
->r_info
);
416 dst
->r_addend
= H_GET_SIGNED_WORD (abfd
, src
->r_addend
);
419 /* Translate an ELF reloc from internal format to external format. */
421 elf_swap_reloc_out (bfd
*abfd
,
422 const Elf_Internal_Rela
*src
,
425 Elf_External_Rel
*dst
= (Elf_External_Rel
*) d
;
426 H_PUT_WORD (abfd
, src
->r_offset
, dst
->r_offset
);
427 H_PUT_WORD (abfd
, src
->r_info
, dst
->r_info
);
431 elf_swap_reloca_out (bfd
*abfd
,
432 const Elf_Internal_Rela
*src
,
435 Elf_External_Rela
*dst
= (Elf_External_Rela
*) d
;
436 H_PUT_WORD (abfd
, src
->r_offset
, dst
->r_offset
);
437 H_PUT_WORD (abfd
, src
->r_info
, dst
->r_info
);
438 H_PUT_SIGNED_WORD (abfd
, src
->r_addend
, dst
->r_addend
);
442 elf_swap_dyn_in (bfd
*abfd
,
444 Elf_Internal_Dyn
*dst
)
446 const Elf_External_Dyn
*src
= (const Elf_External_Dyn
*) p
;
448 dst
->d_tag
= H_GET_WORD (abfd
, src
->d_tag
);
449 dst
->d_un
.d_val
= H_GET_WORD (abfd
, src
->d_un
.d_val
);
453 elf_swap_dyn_out (bfd
*abfd
,
454 const Elf_Internal_Dyn
*src
,
457 Elf_External_Dyn
*dst
= (Elf_External_Dyn
*) p
;
459 H_PUT_WORD (abfd
, src
->d_tag
, dst
->d_tag
);
460 H_PUT_WORD (abfd
, src
->d_un
.d_val
, dst
->d_un
.d_val
);
463 /* ELF .o/exec file reading */
465 /* Begin processing a given object.
467 First we validate the file by reading in the ELF header and checking
470 static inline bfd_boolean
471 elf_file_p (Elf_External_Ehdr
*x_ehdrp
)
473 return ((x_ehdrp
->e_ident
[EI_MAG0
] == ELFMAG0
)
474 && (x_ehdrp
->e_ident
[EI_MAG1
] == ELFMAG1
)
475 && (x_ehdrp
->e_ident
[EI_MAG2
] == ELFMAG2
)
476 && (x_ehdrp
->e_ident
[EI_MAG3
] == ELFMAG3
));
479 /* Check to see if the file associated with ABFD matches the target vector
482 Note that we may be called several times with the same ABFD, but different
483 target vectors, most of which will not match. We have to avoid leaving
484 any side effects in ABFD, or any data it points to (like tdata), if the
485 file does not match the target vector. */
488 elf_object_p (bfd
*abfd
)
490 Elf_External_Ehdr x_ehdr
; /* Elf file header, external form */
491 Elf_Internal_Ehdr
*i_ehdrp
; /* Elf file header, internal form */
492 Elf_External_Shdr x_shdr
; /* Section header table entry, external form */
493 Elf_Internal_Shdr i_shdr
;
494 Elf_Internal_Shdr
*i_shdrp
; /* Section header table, internal form */
495 unsigned int shindex
;
496 const struct elf_backend_data
*ebd
;
499 const bfd_target
*target
;
501 /* Read in the ELF header in external format. */
503 if (bfd_bread (&x_ehdr
, sizeof (x_ehdr
), abfd
) != sizeof (x_ehdr
))
505 if (bfd_get_error () != bfd_error_system_call
)
506 goto got_wrong_format_error
;
511 /* Now check to see if we have a valid ELF file, and one that BFD can
512 make use of. The magic number must match, the address size ('class')
513 and byte-swapping must match our XVEC entry, and it must have a
514 section header table (FIXME: See comments re sections at top of this
517 if (! elf_file_p (&x_ehdr
)
518 || x_ehdr
.e_ident
[EI_VERSION
] != EV_CURRENT
519 || x_ehdr
.e_ident
[EI_CLASS
] != ELFCLASS
)
520 goto got_wrong_format_error
;
522 /* Check that file's byte order matches xvec's */
523 switch (x_ehdr
.e_ident
[EI_DATA
])
525 case ELFDATA2MSB
: /* Big-endian */
526 if (! bfd_header_big_endian (abfd
))
527 goto got_wrong_format_error
;
529 case ELFDATA2LSB
: /* Little-endian */
530 if (! bfd_header_little_endian (abfd
))
531 goto got_wrong_format_error
;
533 case ELFDATANONE
: /* No data encoding specified */
534 default: /* Unknown data encoding specified */
535 goto got_wrong_format_error
;
540 /* Allocate an instance of the elf_obj_tdata structure and hook it up to
541 the tdata pointer in the bfd. */
543 if (! (*target
->_bfd_set_format
[bfd_object
]) (abfd
))
546 /* Now that we know the byte order, swap in the rest of the header */
547 i_ehdrp
= elf_elfheader (abfd
);
548 elf_swap_ehdr_in (abfd
, &x_ehdr
, i_ehdrp
);
550 elf_debug_file (i_ehdrp
);
553 /* Reject ET_CORE (header indicates core file, not object file) */
554 if (i_ehdrp
->e_type
== ET_CORE
)
555 goto got_wrong_format_error
;
557 /* If this is a relocatable file and there is no section header
558 table, then we're hosed. */
559 if (i_ehdrp
->e_shoff
== 0 && i_ehdrp
->e_type
== ET_REL
)
560 goto got_wrong_format_error
;
562 /* As a simple sanity check, verify that what BFD thinks is the
563 size of each section header table entry actually matches the size
564 recorded in the file, but only if there are any sections. */
565 if (i_ehdrp
->e_shentsize
!= sizeof (x_shdr
) && i_ehdrp
->e_shnum
!= 0)
566 goto got_wrong_format_error
;
568 /* Further sanity check. */
569 if (i_ehdrp
->e_shoff
== 0 && i_ehdrp
->e_shnum
!= 0)
570 goto got_wrong_format_error
;
572 ebd
= get_elf_backend_data (abfd
);
573 if (ebd
->s
->arch_size
!= ARCH_SIZE
)
574 goto got_wrong_format_error
;
576 /* Check that the ELF e_machine field matches what this particular
577 BFD format expects. */
578 if (ebd
->elf_machine_code
!= i_ehdrp
->e_machine
579 && (ebd
->elf_machine_alt1
== 0
580 || i_ehdrp
->e_machine
!= ebd
->elf_machine_alt1
)
581 && (ebd
->elf_machine_alt2
== 0
582 || i_ehdrp
->e_machine
!= ebd
->elf_machine_alt2
)
583 && ebd
->elf_machine_code
!= EM_NONE
)
584 goto got_wrong_format_error
;
586 if (i_ehdrp
->e_type
== ET_EXEC
)
587 abfd
->flags
|= EXEC_P
;
588 else if (i_ehdrp
->e_type
== ET_DYN
)
589 abfd
->flags
|= DYNAMIC
;
591 if (i_ehdrp
->e_phnum
> 0)
592 abfd
->flags
|= D_PAGED
;
594 if (! bfd_default_set_arch_mach (abfd
, ebd
->arch
, 0))
596 /* It's OK if this fails for the generic target. */
597 if (ebd
->elf_machine_code
!= EM_NONE
)
601 if (ebd
->elf_machine_code
!= EM_NONE
602 && i_ehdrp
->e_ident
[EI_OSABI
] != ebd
->elf_osabi
603 && ebd
->elf_osabi
!= ELFOSABI_NONE
)
604 goto got_wrong_format_error
;
606 if (i_ehdrp
->e_shoff
!= 0)
608 file_ptr where
= (file_ptr
) i_ehdrp
->e_shoff
;
610 /* Seek to the section header table in the file. */
611 if (bfd_seek (abfd
, where
, SEEK_SET
) != 0)
614 /* Read the first section header at index 0, and convert to internal
616 if (bfd_bread (&x_shdr
, sizeof x_shdr
, abfd
) != sizeof (x_shdr
))
618 elf_swap_shdr_in (abfd
, &x_shdr
, &i_shdr
);
620 /* If the section count is zero, the actual count is in the first
622 if (i_ehdrp
->e_shnum
== SHN_UNDEF
)
624 i_ehdrp
->e_shnum
= i_shdr
.sh_size
;
625 if (i_ehdrp
->e_shnum
>= SHN_LORESERVE
626 || i_ehdrp
->e_shnum
!= i_shdr
.sh_size
627 || i_ehdrp
->e_shnum
== 0)
628 goto got_wrong_format_error
;
631 /* And similarly for the string table index. */
632 if (i_ehdrp
->e_shstrndx
== (SHN_XINDEX
& 0xffff))
634 i_ehdrp
->e_shstrndx
= i_shdr
.sh_link
;
635 if (i_ehdrp
->e_shstrndx
!= i_shdr
.sh_link
)
636 goto got_wrong_format_error
;
639 /* And program headers. */
640 if (i_ehdrp
->e_phnum
== PN_XNUM
&& i_shdr
.sh_info
!= 0)
642 i_ehdrp
->e_phnum
= i_shdr
.sh_info
;
643 if (i_ehdrp
->e_phnum
!= i_shdr
.sh_info
)
644 goto got_wrong_format_error
;
647 /* Sanity check that we can read all of the section headers.
648 It ought to be good enough to just read the last one. */
649 if (i_ehdrp
->e_shnum
!= 1)
651 /* Check that we don't have a totally silly number of sections. */
652 if (i_ehdrp
->e_shnum
> (unsigned int) -1 / sizeof (x_shdr
)
653 || i_ehdrp
->e_shnum
> (unsigned int) -1 / sizeof (i_shdr
))
654 goto got_wrong_format_error
;
656 where
+= (i_ehdrp
->e_shnum
- 1) * sizeof (x_shdr
);
657 if ((bfd_size_type
) where
<= i_ehdrp
->e_shoff
)
658 goto got_wrong_format_error
;
660 if (bfd_seek (abfd
, where
, SEEK_SET
) != 0)
662 if (bfd_bread (&x_shdr
, sizeof x_shdr
, abfd
) != sizeof (x_shdr
))
665 /* Back to where we were. */
666 where
= i_ehdrp
->e_shoff
+ sizeof (x_shdr
);
667 if (bfd_seek (abfd
, where
, SEEK_SET
) != 0)
672 /* Allocate space for a copy of the section header table in
674 if (i_ehdrp
->e_shnum
!= 0)
676 Elf_Internal_Shdr
*shdrp
;
677 unsigned int num_sec
;
680 if (i_ehdrp
->e_shnum
> ((bfd_size_type
) -1) / sizeof (*i_shdrp
))
681 goto got_wrong_format_error
;
683 amt
= sizeof (*i_shdrp
) * i_ehdrp
->e_shnum
;
684 i_shdrp
= (Elf_Internal_Shdr
*) bfd_alloc (abfd
, amt
);
687 num_sec
= i_ehdrp
->e_shnum
;
688 elf_numsections (abfd
) = num_sec
;
689 amt
= sizeof (i_shdrp
) * num_sec
;
690 elf_elfsections (abfd
) = (Elf_Internal_Shdr
**) bfd_alloc (abfd
, amt
);
691 if (!elf_elfsections (abfd
))
694 memcpy (i_shdrp
, &i_shdr
, sizeof (*i_shdrp
));
695 for (shdrp
= i_shdrp
, shindex
= 0; shindex
< num_sec
; shindex
++)
696 elf_elfsections (abfd
)[shindex
] = shdrp
++;
698 /* Read in the rest of the section header table and convert it
700 for (shindex
= 1; shindex
< i_ehdrp
->e_shnum
; shindex
++)
702 if (bfd_bread (&x_shdr
, sizeof x_shdr
, abfd
) != sizeof (x_shdr
))
704 elf_swap_shdr_in (abfd
, &x_shdr
, i_shdrp
+ shindex
);
706 /* Sanity check sh_link and sh_info. */
707 if (i_shdrp
[shindex
].sh_link
>= num_sec
)
709 /* PR 10478: Accept Solaris binaries with a sh_link
710 field set to SHN_BEFORE or SHN_AFTER. */
711 switch (ebd
->elf_machine_code
)
720 if (i_shdrp
[shindex
].sh_link
== (SHN_LORESERVE
& 0xffff) /* SHN_BEFORE */
721 || i_shdrp
[shindex
].sh_link
== ((SHN_LORESERVE
+ 1) & 0xffff) /* SHN_AFTER */)
723 /* Otherwise fall through. */
725 goto got_wrong_format_error
;
729 if (((i_shdrp
[shindex
].sh_flags
& SHF_INFO_LINK
)
730 || i_shdrp
[shindex
].sh_type
== SHT_RELA
731 || i_shdrp
[shindex
].sh_type
== SHT_REL
)
732 && i_shdrp
[shindex
].sh_info
>= num_sec
)
733 goto got_wrong_format_error
;
735 /* If the section is loaded, but not page aligned, clear
737 if (i_shdrp
[shindex
].sh_size
!= 0
738 && (i_shdrp
[shindex
].sh_flags
& SHF_ALLOC
) != 0
739 && i_shdrp
[shindex
].sh_type
!= SHT_NOBITS
740 && (((i_shdrp
[shindex
].sh_addr
- i_shdrp
[shindex
].sh_offset
)
743 abfd
->flags
&= ~D_PAGED
;
747 /* A further sanity check. */
748 if (i_ehdrp
->e_shnum
!= 0)
750 if (i_ehdrp
->e_shstrndx
>= elf_numsections (abfd
))
753 We used to just goto got_wrong_format_error here
754 but there are binaries in existance for which this test
755 will prevent the binutils from working with them at all.
756 So we are kind, and reset the string index value to 0
757 so that at least some processing can be done. */
758 i_ehdrp
->e_shstrndx
= SHN_UNDEF
;
759 _bfd_error_handler (_("warning: %s has a corrupt string table index - ignoring"), abfd
->filename
);
762 else if (i_ehdrp
->e_shstrndx
!= SHN_UNDEF
)
763 goto got_wrong_format_error
;
765 /* Read in the program headers. */
766 if (i_ehdrp
->e_phnum
== 0)
767 elf_tdata (abfd
)->phdr
= NULL
;
770 Elf_Internal_Phdr
*i_phdr
;
774 if (i_ehdrp
->e_phnum
> ((bfd_size_type
) -1) / sizeof (*i_phdr
))
775 goto got_wrong_format_error
;
777 amt
= i_ehdrp
->e_phnum
* sizeof (*i_phdr
);
778 elf_tdata (abfd
)->phdr
= (Elf_Internal_Phdr
*) bfd_alloc (abfd
, amt
);
779 if (elf_tdata (abfd
)->phdr
== NULL
)
781 if (bfd_seek (abfd
, (file_ptr
) i_ehdrp
->e_phoff
, SEEK_SET
) != 0)
783 i_phdr
= elf_tdata (abfd
)->phdr
;
784 for (i
= 0; i
< i_ehdrp
->e_phnum
; i
++, i_phdr
++)
786 Elf_External_Phdr x_phdr
;
788 if (bfd_bread (&x_phdr
, sizeof x_phdr
, abfd
) != sizeof x_phdr
)
790 elf_swap_phdr_in (abfd
, &x_phdr
, i_phdr
);
794 if (i_ehdrp
->e_shstrndx
!= 0 && i_ehdrp
->e_shoff
!= 0)
796 unsigned int num_sec
;
798 /* Once all of the section headers have been read and converted, we
799 can start processing them. Note that the first section header is
800 a dummy placeholder entry, so we ignore it. */
801 num_sec
= elf_numsections (abfd
);
802 for (shindex
= 1; shindex
< num_sec
; shindex
++)
803 if (!bfd_section_from_shdr (abfd
, shindex
))
806 /* Set up ELF sections for SHF_GROUP and SHF_LINK_ORDER. */
807 if (! _bfd_elf_setup_sections (abfd
))
808 goto got_wrong_format_error
;
811 /* Let the backend double check the format and override global
813 if (ebd
->elf_backend_object_p
)
815 if (! (*ebd
->elf_backend_object_p
) (abfd
))
816 goto got_wrong_format_error
;
819 /* Remember the entry point specified in the ELF file header. */
820 bfd_set_start_address (abfd
, i_ehdrp
->e_entry
);
822 /* If we have created any reloc sections that are associated with
823 debugging sections, mark the reloc sections as debugging as well. */
824 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
826 if ((elf_section_data (s
)->this_hdr
.sh_type
== SHT_REL
827 || elf_section_data (s
)->this_hdr
.sh_type
== SHT_RELA
)
828 && elf_section_data (s
)->this_hdr
.sh_info
> 0)
830 unsigned long targ_index
;
833 targ_index
= elf_section_data (s
)->this_hdr
.sh_info
;
834 targ_sec
= bfd_section_from_elf_index (abfd
, targ_index
);
836 && (targ_sec
->flags
& SEC_DEBUGGING
) != 0)
837 s
->flags
|= SEC_DEBUGGING
;
842 got_wrong_format_error
:
843 bfd_set_error (bfd_error_wrong_format
);
849 /* ELF .o/exec file writing */
851 /* Write out the relocs. */
854 elf_write_relocs (bfd
*abfd
, asection
*sec
, void *data
)
856 bfd_boolean
*failedp
= (bfd_boolean
*) data
;
857 Elf_Internal_Shdr
*rela_hdr
;
859 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
866 /* If we have already failed, don't do anything. */
870 if ((sec
->flags
& SEC_RELOC
) == 0)
873 /* The linker backend writes the relocs out itself, and sets the
874 reloc_count field to zero to inhibit writing them here. Also,
875 sometimes the SEC_RELOC flag gets set even when there aren't any
877 if (sec
->reloc_count
== 0)
880 /* If we have opened an existing file for update, reloc_count may be
881 set even though we are not linking. In that case we have nothing
883 if (sec
->orelocation
== NULL
)
886 rela_hdr
= elf_section_data (sec
)->rela
.hdr
;
887 if (rela_hdr
== NULL
)
888 rela_hdr
= elf_section_data (sec
)->rel
.hdr
;
890 rela_hdr
->sh_size
= rela_hdr
->sh_entsize
* sec
->reloc_count
;
891 rela_hdr
->contents
= (unsigned char *) bfd_alloc (abfd
, rela_hdr
->sh_size
);
892 if (rela_hdr
->contents
== NULL
)
898 /* Figure out whether the relocations are RELA or REL relocations. */
899 if (rela_hdr
->sh_type
== SHT_RELA
)
901 swap_out
= elf_swap_reloca_out
;
902 extsize
= sizeof (Elf_External_Rela
);
904 else if (rela_hdr
->sh_type
== SHT_REL
)
906 swap_out
= elf_swap_reloc_out
;
907 extsize
= sizeof (Elf_External_Rel
);
910 /* Every relocation section should be either an SHT_RELA or an
914 /* The address of an ELF reloc is section relative for an object
915 file, and absolute for an executable file or shared library.
916 The address of a BFD reloc is always section relative. */
918 if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
919 addr_offset
= sec
->vma
;
921 /* orelocation has the data, reloc_count has the count... */
924 dst_rela
= rela_hdr
->contents
;
926 for (idx
= 0; idx
< sec
->reloc_count
; idx
++, dst_rela
+= extsize
)
928 Elf_Internal_Rela src_rela
;
933 ptr
= sec
->orelocation
[idx
];
934 sym
= *ptr
->sym_ptr_ptr
;
937 else if (bfd_is_abs_section (sym
->section
) && sym
->value
== 0)
942 n
= _bfd_elf_symbol_from_bfd_symbol (abfd
, &sym
);
951 if ((*ptr
->sym_ptr_ptr
)->the_bfd
!= NULL
952 && (*ptr
->sym_ptr_ptr
)->the_bfd
->xvec
!= abfd
->xvec
953 && ! _bfd_elf_validate_reloc (abfd
, ptr
))
959 src_rela
.r_offset
= ptr
->address
+ addr_offset
;
960 src_rela
.r_info
= ELF_R_INFO (n
, ptr
->howto
->type
);
961 src_rela
.r_addend
= ptr
->addend
;
962 (*swap_out
) (abfd
, &src_rela
, dst_rela
);
966 /* Write out the program headers. */
969 elf_write_out_phdrs (bfd
*abfd
,
970 const Elf_Internal_Phdr
*phdr
,
975 Elf_External_Phdr extphdr
;
976 elf_swap_phdr_out (abfd
, phdr
, &extphdr
);
977 if (bfd_bwrite (&extphdr
, sizeof (Elf_External_Phdr
), abfd
)
978 != sizeof (Elf_External_Phdr
))
985 /* Write out the section headers and the ELF file header. */
988 elf_write_shdrs_and_ehdr (bfd
*abfd
)
990 Elf_External_Ehdr x_ehdr
; /* Elf file header, external form */
991 Elf_Internal_Ehdr
*i_ehdrp
; /* Elf file header, internal form */
992 Elf_External_Shdr
*x_shdrp
; /* Section header table, external form */
993 Elf_Internal_Shdr
**i_shdrp
; /* Section header table, internal form */
997 i_ehdrp
= elf_elfheader (abfd
);
998 i_shdrp
= elf_elfsections (abfd
);
1000 /* swap the header before spitting it out... */
1003 elf_debug_file (i_ehdrp
);
1005 elf_swap_ehdr_out (abfd
, i_ehdrp
, &x_ehdr
);
1006 amt
= sizeof (x_ehdr
);
1007 if (bfd_seek (abfd
, (file_ptr
) 0, SEEK_SET
) != 0
1008 || bfd_bwrite (&x_ehdr
, amt
, abfd
) != amt
)
1011 /* Some fields in the first section header handle overflow of ehdr
1013 if (i_ehdrp
->e_phnum
>= PN_XNUM
)
1014 i_shdrp
[0]->sh_info
= i_ehdrp
->e_phnum
;
1015 if (i_ehdrp
->e_shnum
>= (SHN_LORESERVE
& 0xffff))
1016 i_shdrp
[0]->sh_size
= i_ehdrp
->e_shnum
;
1017 if (i_ehdrp
->e_shstrndx
>= (SHN_LORESERVE
& 0xffff))
1018 i_shdrp
[0]->sh_link
= i_ehdrp
->e_shstrndx
;
1020 /* at this point we've concocted all the ELF sections... */
1021 amt
= i_ehdrp
->e_shnum
;
1022 amt
*= sizeof (*x_shdrp
);
1023 x_shdrp
= (Elf_External_Shdr
*) bfd_alloc (abfd
, amt
);
1027 for (count
= 0; count
< i_ehdrp
->e_shnum
; i_shdrp
++, count
++)
1030 elf_debug_section (count
, *i_shdrp
);
1032 elf_swap_shdr_out (abfd
, *i_shdrp
, x_shdrp
+ count
);
1034 if (bfd_seek (abfd
, (file_ptr
) i_ehdrp
->e_shoff
, SEEK_SET
) != 0
1035 || bfd_bwrite (x_shdrp
, amt
, abfd
) != amt
)
1038 /* need to dump the string table too... */
1044 elf_checksum_contents (bfd
*abfd
,
1045 void (*process
) (const void *, size_t, void *),
1048 Elf_Internal_Ehdr
*i_ehdrp
= elf_elfheader (abfd
);
1049 Elf_Internal_Shdr
**i_shdrp
= elf_elfsections (abfd
);
1050 Elf_Internal_Phdr
*i_phdrp
= elf_tdata (abfd
)->phdr
;
1051 unsigned int count
, num
;
1054 Elf_External_Ehdr x_ehdr
;
1055 Elf_Internal_Ehdr i_ehdr
;
1058 i_ehdr
.e_phoff
= i_ehdr
.e_shoff
= 0;
1059 elf_swap_ehdr_out (abfd
, &i_ehdr
, &x_ehdr
);
1060 (*process
) (&x_ehdr
, sizeof x_ehdr
, arg
);
1063 num
= i_ehdrp
->e_phnum
;
1064 for (count
= 0; count
< num
; count
++)
1066 Elf_External_Phdr x_phdr
;
1067 elf_swap_phdr_out (abfd
, &i_phdrp
[count
], &x_phdr
);
1068 (*process
) (&x_phdr
, sizeof x_phdr
, arg
);
1071 num
= elf_numsections (abfd
);
1072 for (count
= 0; count
< num
; count
++)
1074 Elf_Internal_Shdr i_shdr
;
1075 Elf_External_Shdr x_shdr
;
1076 bfd_byte
*contents
, *free_contents
;
1078 i_shdr
= *i_shdrp
[count
];
1079 i_shdr
.sh_offset
= 0;
1081 elf_swap_shdr_out (abfd
, &i_shdr
, &x_shdr
);
1082 (*process
) (&x_shdr
, sizeof x_shdr
, arg
);
1084 /* Process the section's contents, if it has some.
1085 PR ld/12451: Read them in if necessary. */
1086 if (i_shdr
.sh_type
== SHT_NOBITS
)
1088 free_contents
= NULL
;
1089 contents
= i_shdr
.contents
;
1090 if (contents
== NULL
)
1094 sec
= bfd_section_from_elf_index (abfd
, count
);
1097 contents
= sec
->contents
;
1098 if (contents
== NULL
)
1100 /* Force rereading from file. */
1101 sec
->flags
&= ~SEC_IN_MEMORY
;
1102 if (!bfd_malloc_and_get_section (abfd
, sec
, &free_contents
))
1104 contents
= free_contents
;
1108 if (contents
!= NULL
)
1110 (*process
) (contents
, i_shdr
.sh_size
, arg
);
1111 if (free_contents
!= NULL
)
1112 free (free_contents
);
1120 elf_slurp_symbol_table (bfd
*abfd
, asymbol
**symptrs
, bfd_boolean dynamic
)
1122 Elf_Internal_Shdr
*hdr
;
1123 Elf_Internal_Shdr
*verhdr
;
1124 unsigned long symcount
; /* Number of external ELF symbols */
1125 elf_symbol_type
*sym
; /* Pointer to current bfd symbol */
1126 elf_symbol_type
*symbase
; /* Buffer for generated bfd symbols */
1127 Elf_Internal_Sym
*isym
;
1128 Elf_Internal_Sym
*isymend
;
1129 Elf_Internal_Sym
*isymbuf
= NULL
;
1130 Elf_External_Versym
*xver
;
1131 Elf_External_Versym
*xverbuf
= NULL
;
1132 const struct elf_backend_data
*ebd
;
1135 /* Read each raw ELF symbol, converting from external ELF form to
1136 internal ELF form, and then using the information to create a
1137 canonical bfd symbol table entry.
1139 Note that we allocate the initial bfd canonical symbol buffer
1140 based on a one-to-one mapping of the ELF symbols to canonical
1141 symbols. We actually use all the ELF symbols, so there will be no
1142 space left over at the end. When we have all the symbols, we
1143 build the caller's pointer vector. */
1147 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1152 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
1153 if (elf_dynversym (abfd
) == 0)
1156 verhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
1157 if ((elf_dynverdef (abfd
) != 0
1158 && elf_tdata (abfd
)->verdef
== NULL
)
1159 || (elf_dynverref (abfd
) != 0
1160 && elf_tdata (abfd
)->verref
== NULL
))
1162 if (!_bfd_elf_slurp_version_tables (abfd
, FALSE
))
1167 ebd
= get_elf_backend_data (abfd
);
1168 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
1170 sym
= symbase
= NULL
;
1173 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, symcount
, 0,
1175 if (isymbuf
== NULL
)
1179 amt
*= sizeof (elf_symbol_type
);
1180 symbase
= (elf_symbol_type
*) bfd_zalloc (abfd
, amt
);
1181 if (symbase
== (elf_symbol_type
*) NULL
)
1184 /* Read the raw ELF version symbol information. */
1186 && verhdr
->sh_size
/ sizeof (Elf_External_Versym
) != symcount
)
1188 (*_bfd_error_handler
)
1189 (_("%s: version count (%ld) does not match symbol count (%ld)"),
1191 (long) (verhdr
->sh_size
/ sizeof (Elf_External_Versym
)),
1194 /* Slurp in the symbols without the version information,
1195 since that is more helpful than just quitting. */
1201 if (bfd_seek (abfd
, verhdr
->sh_offset
, SEEK_SET
) != 0)
1204 xverbuf
= (Elf_External_Versym
*) bfd_malloc (verhdr
->sh_size
);
1205 if (xverbuf
== NULL
&& verhdr
->sh_size
!= 0)
1208 if (bfd_bread (xverbuf
, verhdr
->sh_size
, abfd
) != verhdr
->sh_size
)
1212 /* Skip first symbol, which is a null dummy. */
1216 isymend
= isymbuf
+ symcount
;
1217 for (isym
= isymbuf
+ 1, sym
= symbase
; isym
< isymend
; isym
++, sym
++)
1219 memcpy (&sym
->internal_elf_sym
, isym
, sizeof (Elf_Internal_Sym
));
1221 sym
->symbol
.the_bfd
= abfd
;
1222 sym
->symbol
.name
= bfd_elf_sym_name (abfd
, hdr
, isym
, NULL
);
1223 sym
->symbol
.value
= isym
->st_value
;
1225 if (isym
->st_shndx
== SHN_UNDEF
)
1227 sym
->symbol
.section
= bfd_und_section_ptr
;
1229 else if (isym
->st_shndx
== SHN_ABS
)
1231 sym
->symbol
.section
= bfd_abs_section_ptr
;
1233 else if (isym
->st_shndx
== SHN_COMMON
)
1235 sym
->symbol
.section
= bfd_com_section_ptr
;
1236 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
1238 asection
*xc
= bfd_get_section_by_name (abfd
, "COMMON");
1242 flagword flags
= (SEC_ALLOC
| SEC_IS_COMMON
| SEC_KEEP
1244 xc
= bfd_make_section_with_flags (abfd
, "COMMON", flags
);
1248 sym
->symbol
.section
= xc
;
1250 /* Elf puts the alignment into the `value' field, and
1251 the size into the `size' field. BFD wants to see the
1252 size in the value field, and doesn't care (at the
1253 moment) about the alignment. */
1254 sym
->symbol
.value
= isym
->st_size
;
1259 = bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
1260 if (sym
->symbol
.section
== NULL
)
1262 /* This symbol is in a section for which we did not
1263 create a BFD section. Just use bfd_abs_section,
1264 although it is wrong. FIXME. */
1265 sym
->symbol
.section
= bfd_abs_section_ptr
;
1269 /* If this is a relocatable file, then the symbol value is
1270 already section relative. */
1271 if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1272 sym
->symbol
.value
-= sym
->symbol
.section
->vma
;
1274 switch (ELF_ST_BIND (isym
->st_info
))
1277 sym
->symbol
.flags
|= BSF_LOCAL
;
1280 if (isym
->st_shndx
!= SHN_UNDEF
&& isym
->st_shndx
!= SHN_COMMON
)
1281 sym
->symbol
.flags
|= BSF_GLOBAL
;
1284 sym
->symbol
.flags
|= BSF_WEAK
;
1286 case STB_GNU_UNIQUE
:
1287 sym
->symbol
.flags
|= BSF_GNU_UNIQUE
;
1291 switch (ELF_ST_TYPE (isym
->st_info
))
1294 sym
->symbol
.flags
|= BSF_SECTION_SYM
| BSF_DEBUGGING
;
1297 sym
->symbol
.flags
|= BSF_FILE
| BSF_DEBUGGING
;
1300 sym
->symbol
.flags
|= BSF_FUNCTION
;
1303 /* FIXME: Do we have to put the size field into the value field
1304 as we do with symbols in SHN_COMMON sections (see above) ? */
1307 sym
->symbol
.flags
|= BSF_OBJECT
;
1310 sym
->symbol
.flags
|= BSF_THREAD_LOCAL
;
1313 sym
->symbol
.flags
|= BSF_RELC
;
1316 sym
->symbol
.flags
|= BSF_SRELC
;
1319 sym
->symbol
.flags
|= BSF_GNU_INDIRECT_FUNCTION
;
1324 sym
->symbol
.flags
|= BSF_DYNAMIC
;
1328 Elf_Internal_Versym iversym
;
1330 _bfd_elf_swap_versym_in (abfd
, xver
, &iversym
);
1331 sym
->version
= iversym
.vs_vers
;
1335 /* Do some backend-specific processing on this symbol. */
1336 if (ebd
->elf_backend_symbol_processing
)
1337 (*ebd
->elf_backend_symbol_processing
) (abfd
, &sym
->symbol
);
1341 /* Do some backend-specific processing on this symbol table. */
1342 if (ebd
->elf_backend_symbol_table_processing
)
1343 (*ebd
->elf_backend_symbol_table_processing
) (abfd
, symbase
, symcount
);
1345 /* We rely on the zalloc to clear out the final symbol entry. */
1347 symcount
= sym
- symbase
;
1349 /* Fill in the user's symbol pointer vector if needed. */
1357 *symptrs
++ = &sym
->symbol
;
1360 *symptrs
= 0; /* Final null pointer */
1363 if (xverbuf
!= NULL
)
1365 if (isymbuf
!= NULL
&& hdr
->contents
!= (unsigned char *) isymbuf
)
1370 if (xverbuf
!= NULL
)
1372 if (isymbuf
!= NULL
&& hdr
->contents
!= (unsigned char *) isymbuf
)
1377 /* Read relocations for ASECT from REL_HDR. There are RELOC_COUNT of
1381 elf_slurp_reloc_table_from_section (bfd
*abfd
,
1383 Elf_Internal_Shdr
*rel_hdr
,
1384 bfd_size_type reloc_count
,
1387 bfd_boolean dynamic
)
1389 const struct elf_backend_data
* const ebd
= get_elf_backend_data (abfd
);
1390 void *allocated
= NULL
;
1391 bfd_byte
*native_relocs
;
1395 unsigned int symcount
;
1397 allocated
= bfd_malloc (rel_hdr
->sh_size
);
1398 if (allocated
== NULL
)
1401 if (bfd_seek (abfd
, rel_hdr
->sh_offset
, SEEK_SET
) != 0
1402 || (bfd_bread (allocated
, rel_hdr
->sh_size
, abfd
)
1403 != rel_hdr
->sh_size
))
1406 native_relocs
= (bfd_byte
*) allocated
;
1408 entsize
= rel_hdr
->sh_entsize
;
1409 BFD_ASSERT (entsize
== sizeof (Elf_External_Rel
)
1410 || entsize
== sizeof (Elf_External_Rela
));
1413 symcount
= bfd_get_dynamic_symcount (abfd
);
1415 symcount
= bfd_get_symcount (abfd
);
1417 for (i
= 0, relent
= relents
;
1419 i
++, relent
++, native_relocs
+= entsize
)
1421 Elf_Internal_Rela rela
;
1423 if (entsize
== sizeof (Elf_External_Rela
))
1424 elf_swap_reloca_in (abfd
, native_relocs
, &rela
);
1426 elf_swap_reloc_in (abfd
, native_relocs
, &rela
);
1428 /* The address of an ELF reloc is section relative for an object
1429 file, and absolute for an executable file or shared library.
1430 The address of a normal BFD reloc is always section relative,
1431 and the address of a dynamic reloc is absolute.. */
1432 if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) == 0 || dynamic
)
1433 relent
->address
= rela
.r_offset
;
1435 relent
->address
= rela
.r_offset
- asect
->vma
;
1437 if (ELF_R_SYM (rela
.r_info
) == STN_UNDEF
)
1438 relent
->sym_ptr_ptr
= bfd_abs_section_ptr
->symbol_ptr_ptr
;
1439 else if (ELF_R_SYM (rela
.r_info
) > symcount
)
1441 (*_bfd_error_handler
)
1442 (_("%s(%s): relocation %d has invalid symbol index %ld"),
1443 abfd
->filename
, asect
->name
, i
, ELF_R_SYM (rela
.r_info
));
1444 relent
->sym_ptr_ptr
= bfd_abs_section_ptr
->symbol_ptr_ptr
;
1450 ps
= symbols
+ ELF_R_SYM (rela
.r_info
) - 1;
1452 relent
->sym_ptr_ptr
= ps
;
1455 relent
->addend
= rela
.r_addend
;
1457 if ((entsize
== sizeof (Elf_External_Rela
)
1458 && ebd
->elf_info_to_howto
!= NULL
)
1459 || ebd
->elf_info_to_howto_rel
== NULL
)
1460 (*ebd
->elf_info_to_howto
) (abfd
, relent
, &rela
);
1462 (*ebd
->elf_info_to_howto_rel
) (abfd
, relent
, &rela
);
1465 if (allocated
!= NULL
)
1471 if (allocated
!= NULL
)
1476 /* Read in and swap the external relocs. */
1479 elf_slurp_reloc_table (bfd
*abfd
,
1482 bfd_boolean dynamic
)
1484 struct bfd_elf_section_data
* const d
= elf_section_data (asect
);
1485 Elf_Internal_Shdr
*rel_hdr
;
1486 Elf_Internal_Shdr
*rel_hdr2
;
1487 bfd_size_type reloc_count
;
1488 bfd_size_type reloc_count2
;
1492 if (asect
->relocation
!= NULL
)
1497 if ((asect
->flags
& SEC_RELOC
) == 0
1498 || asect
->reloc_count
== 0)
1501 rel_hdr
= d
->rel
.hdr
;
1502 reloc_count
= rel_hdr
? NUM_SHDR_ENTRIES (rel_hdr
) : 0;
1503 rel_hdr2
= d
->rela
.hdr
;
1504 reloc_count2
= rel_hdr2
? NUM_SHDR_ENTRIES (rel_hdr2
) : 0;
1506 /* PR 17512: file: 0b4f81b7. */
1507 if (asect
->reloc_count
!= reloc_count
+ reloc_count2
)
1509 BFD_ASSERT ((rel_hdr
&& asect
->rel_filepos
== rel_hdr
->sh_offset
)
1510 || (rel_hdr2
&& asect
->rel_filepos
== rel_hdr2
->sh_offset
));
1515 /* Note that ASECT->RELOC_COUNT tends not to be accurate in this
1516 case because relocations against this section may use the
1517 dynamic symbol table, and in that case bfd_section_from_shdr
1518 in elf.c does not update the RELOC_COUNT. */
1519 if (asect
->size
== 0)
1522 rel_hdr
= &d
->this_hdr
;
1523 reloc_count
= NUM_SHDR_ENTRIES (rel_hdr
);
1528 amt
= (reloc_count
+ reloc_count2
) * sizeof (arelent
);
1529 relents
= (arelent
*) bfd_alloc (abfd
, amt
);
1530 if (relents
== NULL
)
1534 && !elf_slurp_reloc_table_from_section (abfd
, asect
,
1535 rel_hdr
, reloc_count
,
1541 && !elf_slurp_reloc_table_from_section (abfd
, asect
,
1542 rel_hdr2
, reloc_count2
,
1543 relents
+ reloc_count
,
1547 asect
->relocation
= relents
;
1553 elf_debug_section (int num
, Elf_Internal_Shdr
*hdr
)
1555 fprintf (stderr
, "\nSection#%d '%s' 0x%.8lx\n", num
,
1556 hdr
->bfd_section
!= NULL
? hdr
->bfd_section
->name
: "",
1559 "sh_name = %ld\tsh_type = %ld\tsh_flags = %ld\n",
1560 (long) hdr
->sh_name
,
1561 (long) hdr
->sh_type
,
1562 (long) hdr
->sh_flags
);
1564 "sh_addr = %ld\tsh_offset = %ld\tsh_size = %ld\n",
1565 (long) hdr
->sh_addr
,
1566 (long) hdr
->sh_offset
,
1567 (long) hdr
->sh_size
);
1569 "sh_link = %ld\tsh_info = %ld\tsh_addralign = %ld\n",
1570 (long) hdr
->sh_link
,
1571 (long) hdr
->sh_info
,
1572 (long) hdr
->sh_addralign
);
1573 fprintf (stderr
, "sh_entsize = %ld\n",
1574 (long) hdr
->sh_entsize
);
1581 elf_debug_file (Elf_Internal_Ehdr
*ehdrp
)
1583 fprintf (stderr
, "e_entry = 0x%.8lx\n", (long) ehdrp
->e_entry
);
1584 fprintf (stderr
, "e_phoff = %ld\n", (long) ehdrp
->e_phoff
);
1585 fprintf (stderr
, "e_phnum = %ld\n", (long) ehdrp
->e_phnum
);
1586 fprintf (stderr
, "e_phentsize = %ld\n", (long) ehdrp
->e_phentsize
);
1587 fprintf (stderr
, "e_shoff = %ld\n", (long) ehdrp
->e_shoff
);
1588 fprintf (stderr
, "e_shnum = %ld\n", (long) ehdrp
->e_shnum
);
1589 fprintf (stderr
, "e_shentsize = %ld\n", (long) ehdrp
->e_shentsize
);
1593 /* Create a new BFD as if by bfd_openr. Rather than opening a file,
1594 reconstruct an ELF file by reading the segments out of remote
1595 memory based on the ELF file header at EHDR_VMA and the ELF program
1596 headers it points to. If non-zero, SIZE is the known extent of the
1597 object. If not null, *LOADBASEP is filled in with the difference
1598 between the VMAs from which the segments were read, and the VMAs
1599 the file headers (and hence BFD's idea of each section's VMA) put
1602 The function TARGET_READ_MEMORY is called to copy LEN bytes from
1603 the remote memory at target address VMA into the local buffer at
1604 MYADDR; it should return zero on success or an `errno' code on
1605 failure. TEMPL must be a BFD for a target with the word size and
1606 byte order found in the remote memory. */
1609 NAME(_bfd_elf
,bfd_from_remote_memory
)
1614 int (*target_read_memory
) (bfd_vma
, bfd_byte
*, bfd_size_type
))
1616 Elf_External_Ehdr x_ehdr
; /* Elf file header, external form */
1617 Elf_Internal_Ehdr i_ehdr
; /* Elf file header, internal form */
1618 Elf_External_Phdr
*x_phdrs
;
1619 Elf_Internal_Phdr
*i_phdrs
, *last_phdr
, *first_phdr
;
1621 struct bfd_in_memory
*bim
;
1625 bfd_vma high_offset
;
1629 /* Read in the ELF header in external format. */
1630 err
= target_read_memory (ehdr_vma
, (bfd_byte
*) &x_ehdr
, sizeof x_ehdr
);
1633 bfd_set_error (bfd_error_system_call
);
1638 /* Now check to see if we have a valid ELF file, and one that BFD can
1639 make use of. The magic number must match, the address size ('class')
1640 and byte-swapping must match our XVEC entry. */
1642 if (! elf_file_p (&x_ehdr
)
1643 || x_ehdr
.e_ident
[EI_VERSION
] != EV_CURRENT
1644 || x_ehdr
.e_ident
[EI_CLASS
] != ELFCLASS
)
1646 bfd_set_error (bfd_error_wrong_format
);
1650 /* Check that file's byte order matches xvec's */
1651 switch (x_ehdr
.e_ident
[EI_DATA
])
1653 case ELFDATA2MSB
: /* Big-endian */
1654 if (! bfd_header_big_endian (templ
))
1656 bfd_set_error (bfd_error_wrong_format
);
1660 case ELFDATA2LSB
: /* Little-endian */
1661 if (! bfd_header_little_endian (templ
))
1663 bfd_set_error (bfd_error_wrong_format
);
1667 case ELFDATANONE
: /* No data encoding specified */
1668 default: /* Unknown data encoding specified */
1669 bfd_set_error (bfd_error_wrong_format
);
1673 elf_swap_ehdr_in (templ
, &x_ehdr
, &i_ehdr
);
1675 /* The file header tells where to find the program headers.
1676 These are what we use to actually choose what to read. */
1678 if (i_ehdr
.e_phentsize
!= sizeof (Elf_External_Phdr
) || i_ehdr
.e_phnum
== 0)
1680 bfd_set_error (bfd_error_wrong_format
);
1684 x_phdrs
= (Elf_External_Phdr
*)
1685 bfd_malloc (i_ehdr
.e_phnum
* (sizeof *x_phdrs
+ sizeof *i_phdrs
));
1686 if (x_phdrs
== NULL
)
1688 err
= target_read_memory (ehdr_vma
+ i_ehdr
.e_phoff
, (bfd_byte
*) x_phdrs
,
1689 i_ehdr
.e_phnum
* sizeof x_phdrs
[0]);
1693 bfd_set_error (bfd_error_system_call
);
1697 i_phdrs
= (Elf_Internal_Phdr
*) &x_phdrs
[i_ehdr
.e_phnum
];
1703 for (i
= 0; i
< i_ehdr
.e_phnum
; ++i
)
1705 elf_swap_phdr_in (templ
, &x_phdrs
[i
], &i_phdrs
[i
]);
1706 if (i_phdrs
[i
].p_type
== PT_LOAD
)
1708 bfd_vma segment_end
= i_phdrs
[i
].p_offset
+ i_phdrs
[i
].p_filesz
;
1710 if (segment_end
> high_offset
)
1712 high_offset
= segment_end
;
1713 last_phdr
= &i_phdrs
[i
];
1716 /* If this program header covers offset zero, where the file
1717 header sits, then we can figure out the loadbase. */
1718 if (first_phdr
== NULL
)
1720 bfd_vma p_offset
= i_phdrs
[i
].p_offset
;
1721 bfd_vma p_vaddr
= i_phdrs
[i
].p_vaddr
;
1723 if (i_phdrs
[i
].p_align
> 1)
1725 p_offset
&= -i_phdrs
[i
].p_align
;
1726 p_vaddr
&= -i_phdrs
[i
].p_align
;
1730 loadbase
= ehdr_vma
- p_vaddr
;
1731 first_phdr
= &i_phdrs
[i
];
1736 if (high_offset
== 0)
1738 /* There were no PT_LOAD segments, so we don't have anything to read. */
1740 bfd_set_error (bfd_error_wrong_format
);
1745 if (i_ehdr
.e_shoff
!= 0 && i_ehdr
.e_shnum
!= 0 && i_ehdr
.e_shentsize
!= 0)
1747 shdr_end
= i_ehdr
.e_shoff
+ i_ehdr
.e_shnum
* i_ehdr
.e_shentsize
;
1749 if (last_phdr
->p_filesz
!= last_phdr
->p_memsz
)
1751 /* If the last PT_LOAD header has a bss area then ld.so will
1752 have cleared anything past p_filesz, zapping the section
1755 else if (size
>= shdr_end
)
1759 bfd_vma page_size
= get_elf_backend_data (templ
)->minpagesize
;
1760 bfd_vma segment_end
= last_phdr
->p_offset
+ last_phdr
->p_filesz
;
1762 /* Assume we loaded full pages, allowing us to sometimes see
1764 if (page_size
> 1 && shdr_end
> segment_end
)
1766 bfd_vma page_end
= (segment_end
+ page_size
- 1) & -page_size
;
1768 if (page_end
>= shdr_end
)
1769 /* Whee, section headers covered. */
1770 high_offset
= shdr_end
;
1775 /* Now we know the size of the whole image we want read in. */
1776 contents
= (bfd_byte
*) bfd_zmalloc (high_offset
);
1777 if (contents
== NULL
)
1783 for (i
= 0; i
< i_ehdr
.e_phnum
; ++i
)
1784 if (i_phdrs
[i
].p_type
== PT_LOAD
)
1786 bfd_vma start
= i_phdrs
[i
].p_offset
;
1787 bfd_vma end
= start
+ i_phdrs
[i
].p_filesz
;
1788 bfd_vma vaddr
= i_phdrs
[i
].p_vaddr
;
1790 /* Extend the beginning of the first pt_load to cover file
1791 header and program headers, if we proved earlier that its
1792 aligned offset is 0. */
1793 if (first_phdr
== &i_phdrs
[i
])
1798 /* Extend the end of the last pt_load to cover section headers. */
1799 if (last_phdr
== &i_phdrs
[i
])
1801 err
= target_read_memory (loadbase
+ vaddr
,
1802 contents
+ start
, end
- start
);
1807 bfd_set_error (bfd_error_system_call
);
1814 /* If the segments visible in memory didn't include the section headers,
1815 then clear them from the file header. */
1816 if (high_offset
< shdr_end
)
1818 memset (&x_ehdr
.e_shoff
, 0, sizeof x_ehdr
.e_shoff
);
1819 memset (&x_ehdr
.e_shnum
, 0, sizeof x_ehdr
.e_shnum
);
1820 memset (&x_ehdr
.e_shstrndx
, 0, sizeof x_ehdr
.e_shstrndx
);
1823 /* This will normally have been in the first PT_LOAD segment. But it
1824 conceivably could be missing, and we might have just changed it. */
1825 memcpy (contents
, &x_ehdr
, sizeof x_ehdr
);
1827 /* Now we have a memory image of the ELF file contents. Make a BFD. */
1828 bim
= (struct bfd_in_memory
*) bfd_malloc (sizeof (struct bfd_in_memory
));
1834 nbfd
= _bfd_new_bfd ();
1841 nbfd
->filename
= xstrdup ("<in-memory>");
1842 nbfd
->xvec
= templ
->xvec
;
1843 bim
->size
= high_offset
;
1844 bim
->buffer
= contents
;
1845 nbfd
->iostream
= bim
;
1846 nbfd
->flags
= BFD_IN_MEMORY
;
1847 nbfd
->iovec
= &_bfd_memory_iovec
;
1849 nbfd
->direction
= read_direction
;
1850 nbfd
->mtime
= time (NULL
);
1851 nbfd
->mtime_set
= TRUE
;
1854 *loadbasep
= loadbase
;
1858 /* Function for ELF_R_INFO. */
1861 NAME(elf
,r_info
) (bfd_vma sym
, bfd_vma type
)
1863 return ELF_R_INFO (sym
, type
);
1866 /* Function for ELF_R_SYM. */
1869 NAME(elf
,r_sym
) (bfd_vma r_info
)
1871 return ELF_R_SYM (r_info
);
1874 #include "elfcore.h"
1876 /* Size-dependent data and functions. */
1877 const struct elf_size_info
NAME(_bfd_elf
,size_info
) = {
1878 sizeof (Elf_External_Ehdr
),
1879 sizeof (Elf_External_Phdr
),
1880 sizeof (Elf_External_Shdr
),
1881 sizeof (Elf_External_Rel
),
1882 sizeof (Elf_External_Rela
),
1883 sizeof (Elf_External_Sym
),
1884 sizeof (Elf_External_Dyn
),
1885 sizeof (Elf_External_Note
),
1888 ARCH_SIZE
, LOG_FILE_ALIGN
,
1889 ELFCLASS
, EV_CURRENT
,
1890 elf_write_out_phdrs
,
1891 elf_write_shdrs_and_ehdr
,
1892 elf_checksum_contents
,
1895 elf_swap_symbol_out
,
1896 elf_slurp_reloc_table
,
1897 elf_slurp_symbol_table
,