1 /* ELF executable support for BFD.
2 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003 Free Software Foundation, Inc.
5 Written by Fred Fish @ Cygnus Support, from information published
6 in "UNIX System V Release 4, Programmers Guide: ANSI C and
7 Programming Support Tools". Sufficient support for gdb.
9 Rewritten by Mark Eichin @ Cygnus Support, from information
10 published in "System V Application Binary Interface", chapters 4
11 and 5, as well as the various "Processor Supplement" documents
12 derived from it. Added support for assembler and other object file
13 utilities. Further work done by Ken Raeburn (Cygnus Support), Michael
14 Meissner (Open Software Foundation), and Peter Hoogenboom (University
15 of Utah) to finish and extend this.
17 This file is part of BFD, the Binary File Descriptor library.
19 This program is free software; you can redistribute it and/or modify
20 it under the terms of the GNU General Public License as published by
21 the Free Software Foundation; either version 2 of the License, or
22 (at your option) any later version.
24 This program is distributed in the hope that it will be useful,
25 but WITHOUT ANY WARRANTY; without even the implied warranty of
26 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 GNU General Public License for more details.
29 You should have received a copy of the GNU General Public License
30 along with this program; if not, write to the Free Software
31 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
33 /* Problems and other issues to resolve.
35 (1) BFD expects there to be some fixed number of "sections" in
36 the object file. I.E. there is a "section_count" variable in the
37 bfd structure which contains the number of sections. However, ELF
38 supports multiple "views" of a file. In particular, with current
39 implementations, executable files typically have two tables, a
40 program header table and a section header table, both of which
41 partition the executable.
43 In ELF-speak, the "linking view" of the file uses the section header
44 table to access "sections" within the file, and the "execution view"
45 uses the program header table to access "segments" within the file.
46 "Segments" typically may contain all the data from one or more
49 Note that the section header table is optional in ELF executables,
50 but it is this information that is most useful to gdb. If the
51 section header table is missing, then gdb should probably try
52 to make do with the program header table. (FIXME)
54 (2) The code in this file is compiled twice, once in 32-bit mode and
55 once in 64-bit mode. More of it should be made size-independent
58 (3) ELF section symbols are handled rather sloppily now. This should
59 be cleaned up, and ELF section symbols reconciled with BFD section
62 (4) We need a published spec for 64-bit ELF. We've got some stuff here
63 that we're using for SPARC V9 64-bit chips, but don't assume that
69 #include "libiberty.h"
74 /* Renaming structures, typedefs, macros and functions to be size-specific. */
75 #define Elf_External_Ehdr NAME(Elf,External_Ehdr)
76 #define Elf_External_Sym NAME(Elf,External_Sym)
77 #define Elf_External_Shdr NAME(Elf,External_Shdr)
78 #define Elf_External_Phdr NAME(Elf,External_Phdr)
79 #define Elf_External_Rel NAME(Elf,External_Rel)
80 #define Elf_External_Rela NAME(Elf,External_Rela)
81 #define Elf_External_Dyn NAME(Elf,External_Dyn)
83 #define elf_core_file_failing_command NAME(bfd_elf,core_file_failing_command)
84 #define elf_core_file_failing_signal NAME(bfd_elf,core_file_failing_signal)
85 #define elf_core_file_matches_executable_p \
86 NAME(bfd_elf,core_file_matches_executable_p)
87 #define elf_object_p NAME(bfd_elf,object_p)
88 #define elf_core_file_p NAME(bfd_elf,core_file_p)
89 #define elf_get_symtab_upper_bound NAME(bfd_elf,get_symtab_upper_bound)
90 #define elf_get_dynamic_symtab_upper_bound \
91 NAME(bfd_elf,get_dynamic_symtab_upper_bound)
92 #define elf_swap_reloc_in NAME(bfd_elf,swap_reloc_in)
93 #define elf_swap_reloca_in NAME(bfd_elf,swap_reloca_in)
94 #define elf_swap_reloc_out NAME(bfd_elf,swap_reloc_out)
95 #define elf_swap_reloca_out NAME(bfd_elf,swap_reloca_out)
96 #define elf_swap_symbol_in NAME(bfd_elf,swap_symbol_in)
97 #define elf_swap_symbol_out NAME(bfd_elf,swap_symbol_out)
98 #define elf_swap_phdr_in NAME(bfd_elf,swap_phdr_in)
99 #define elf_swap_phdr_out NAME(bfd_elf,swap_phdr_out)
100 #define elf_swap_dyn_in NAME(bfd_elf,swap_dyn_in)
101 #define elf_swap_dyn_out NAME(bfd_elf,swap_dyn_out)
102 #define elf_get_reloc_upper_bound NAME(bfd_elf,get_reloc_upper_bound)
103 #define elf_canonicalize_reloc NAME(bfd_elf,canonicalize_reloc)
104 #define elf_slurp_symbol_table NAME(bfd_elf,slurp_symbol_table)
105 #define elf_get_symtab NAME(bfd_elf,get_symtab)
106 #define elf_canonicalize_dynamic_symtab \
107 NAME(bfd_elf,canonicalize_dynamic_symtab)
108 #define elf_make_empty_symbol NAME(bfd_elf,make_empty_symbol)
109 #define elf_get_symbol_info NAME(bfd_elf,get_symbol_info)
110 #define elf_get_lineno NAME(bfd_elf,get_lineno)
111 #define elf_set_arch_mach NAME(bfd_elf,set_arch_mach)
112 #define elf_find_nearest_line NAME(bfd_elf,find_nearest_line)
113 #define elf_sizeof_headers NAME(bfd_elf,sizeof_headers)
114 #define elf_set_section_contents NAME(bfd_elf,set_section_contents)
115 #define elf_no_info_to_howto NAME(bfd_elf,no_info_to_howto)
116 #define elf_no_info_to_howto_rel NAME(bfd_elf,no_info_to_howto_rel)
117 #define elf_find_section NAME(bfd_elf,find_section)
118 #define elf_bfd_link_add_symbols NAME(bfd_elf,bfd_link_add_symbols)
119 #define elf_add_dynamic_entry NAME(bfd_elf,add_dynamic_entry)
120 #define elf_write_shdrs_and_ehdr NAME(bfd_elf,write_shdrs_and_ehdr)
121 #define elf_write_out_phdrs NAME(bfd_elf,write_out_phdrs)
122 #define elf_write_relocs NAME(bfd_elf,write_relocs)
123 #define elf_slurp_reloc_table NAME(bfd_elf,slurp_reloc_table)
124 #define elf_bfd_discard_info NAME(bfd_elf,discard_info)
125 #define elf_reloc_symbol_deleted_p NAME(_bfd_elf,reloc_symbol_deleted_p)
126 #define elf_link_record_dynamic_symbol _bfd_elf_link_record_dynamic_symbol
127 #define elf_bfd_final_link NAME(bfd_elf,bfd_final_link)
128 #define elf_gc_sections NAME(_bfd_elf,gc_sections)
129 #define elf_gc_common_finalize_got_offsets \
130 NAME(_bfd_elf,gc_common_finalize_got_offsets)
131 #define elf_gc_common_final_link NAME(_bfd_elf,gc_common_final_link)
132 #define elf_gc_record_vtinherit NAME(_bfd_elf,gc_record_vtinherit)
133 #define elf_gc_record_vtentry NAME(_bfd_elf,gc_record_vtentry)
134 #define elf_link_record_local_dynamic_symbol \
135 NAME(_bfd_elf,link_record_local_dynamic_symbol)
138 #define ELF_R_INFO(X,Y) ELF64_R_INFO(X,Y)
139 #define ELF_R_SYM(X) ELF64_R_SYM(X)
140 #define ELF_R_TYPE(X) ELF64_R_TYPE(X)
141 #define ELFCLASS ELFCLASS64
143 #define LOG_FILE_ALIGN 3
146 #define ELF_R_INFO(X,Y) ELF32_R_INFO(X,Y)
147 #define ELF_R_SYM(X) ELF32_R_SYM(X)
148 #define ELF_R_TYPE(X) ELF32_R_TYPE(X)
149 #define ELFCLASS ELFCLASS32
151 #define LOG_FILE_ALIGN 2
154 /* Static functions */
156 static void elf_swap_ehdr_in
157 PARAMS ((bfd *, const Elf_External_Ehdr *, Elf_Internal_Ehdr *));
158 static void elf_swap_ehdr_out
159 PARAMS ((bfd *, const Elf_Internal_Ehdr *, Elf_External_Ehdr *));
160 static void elf_swap_shdr_in
161 PARAMS ((bfd *, const Elf_External_Shdr *, Elf_Internal_Shdr *));
162 static void elf_swap_shdr_out
163 PARAMS ((bfd *, const Elf_Internal_Shdr *, Elf_External_Shdr *));
165 #define elf_stringtab_init _bfd_elf_stringtab_init
167 #define section_from_elf_index bfd_section_from_elf_index
169 static bfd_boolean elf_slurp_reloc_table_from_section
170 PARAMS ((bfd *, asection *, Elf_Internal_Shdr *, bfd_size_type,
171 arelent *, asymbol **, bfd_boolean));
173 static bfd_boolean elf_file_p PARAMS ((Elf_External_Ehdr *));
176 static void elf_debug_section PARAMS ((int, Elf_Internal_Shdr *));
177 static void elf_debug_file PARAMS ((Elf_Internal_Ehdr *));
178 static char *elf_symbol_flags PARAMS ((flagword));
181 /* Structure swapping routines */
183 /* Should perhaps use put_offset, put_word, etc. For now, the two versions
184 can be handled by explicitly specifying 32 bits or "the long type". */
186 #define H_PUT_WORD H_PUT_64
187 #define H_PUT_SIGNED_WORD H_PUT_S64
188 #define H_GET_WORD H_GET_64
189 #define H_GET_SIGNED_WORD H_GET_S64
192 #define H_PUT_WORD H_PUT_32
193 #define H_PUT_SIGNED_WORD H_PUT_S32
194 #define H_GET_WORD H_GET_32
195 #define H_GET_SIGNED_WORD H_GET_S32
198 /* Translate an ELF symbol in external format into an ELF symbol in internal
202 elf_swap_symbol_in (abfd, psrc, pshn, dst)
206 Elf_Internal_Sym *dst;
208 const Elf_External_Sym *src = (const Elf_External_Sym *) psrc;
209 const Elf_External_Sym_Shndx *shndx = (const Elf_External_Sym_Shndx *) pshn;
210 int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma;
212 dst->st_name = H_GET_32 (abfd, src->st_name);
214 dst->st_value = H_GET_SIGNED_WORD (abfd, src->st_value);
216 dst->st_value = H_GET_WORD (abfd, src->st_value);
217 dst->st_size = H_GET_WORD (abfd, src->st_size);
218 dst->st_info = H_GET_8 (abfd, src->st_info);
219 dst->st_other = H_GET_8 (abfd, src->st_other);
220 dst->st_shndx = H_GET_16 (abfd, src->st_shndx);
221 if (dst->st_shndx == SHN_XINDEX)
225 dst->st_shndx = H_GET_32 (abfd, shndx->est_shndx);
229 /* Translate an ELF symbol in internal format into an ELF symbol in external
233 elf_swap_symbol_out (abfd, src, cdst, shndx)
235 const Elf_Internal_Sym *src;
240 Elf_External_Sym *dst = (Elf_External_Sym *) cdst;
241 H_PUT_32 (abfd, src->st_name, dst->st_name);
242 H_PUT_WORD (abfd, src->st_value, dst->st_value);
243 H_PUT_WORD (abfd, src->st_size, dst->st_size);
244 H_PUT_8 (abfd, src->st_info, dst->st_info);
245 H_PUT_8 (abfd, src->st_other, dst->st_other);
247 if (tmp > SHN_HIRESERVE)
251 H_PUT_32 (abfd, tmp, shndx);
254 H_PUT_16 (abfd, tmp, dst->st_shndx);
257 /* Translate an ELF file header in external format into an ELF file header in
261 elf_swap_ehdr_in (abfd, src, dst)
263 const Elf_External_Ehdr *src;
264 Elf_Internal_Ehdr *dst;
266 int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma;
267 memcpy (dst->e_ident, src->e_ident, EI_NIDENT);
268 dst->e_type = H_GET_16 (abfd, src->e_type);
269 dst->e_machine = H_GET_16 (abfd, src->e_machine);
270 dst->e_version = H_GET_32 (abfd, src->e_version);
272 dst->e_entry = H_GET_SIGNED_WORD (abfd, src->e_entry);
274 dst->e_entry = H_GET_WORD (abfd, src->e_entry);
275 dst->e_phoff = H_GET_WORD (abfd, src->e_phoff);
276 dst->e_shoff = H_GET_WORD (abfd, src->e_shoff);
277 dst->e_flags = H_GET_32 (abfd, src->e_flags);
278 dst->e_ehsize = H_GET_16 (abfd, src->e_ehsize);
279 dst->e_phentsize = H_GET_16 (abfd, src->e_phentsize);
280 dst->e_phnum = H_GET_16 (abfd, src->e_phnum);
281 dst->e_shentsize = H_GET_16 (abfd, src->e_shentsize);
282 dst->e_shnum = H_GET_16 (abfd, src->e_shnum);
283 dst->e_shstrndx = H_GET_16 (abfd, src->e_shstrndx);
286 /* Translate an ELF file header in internal format into an ELF file header in
290 elf_swap_ehdr_out (abfd, src, dst)
292 const Elf_Internal_Ehdr *src;
293 Elf_External_Ehdr *dst;
296 int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma;
297 memcpy (dst->e_ident, src->e_ident, EI_NIDENT);
298 /* note that all elements of dst are *arrays of unsigned char* already... */
299 H_PUT_16 (abfd, src->e_type, dst->e_type);
300 H_PUT_16 (abfd, src->e_machine, dst->e_machine);
301 H_PUT_32 (abfd, src->e_version, dst->e_version);
303 H_PUT_SIGNED_WORD (abfd, src->e_entry, dst->e_entry);
305 H_PUT_WORD (abfd, src->e_entry, dst->e_entry);
306 H_PUT_WORD (abfd, src->e_phoff, dst->e_phoff);
307 H_PUT_WORD (abfd, src->e_shoff, dst->e_shoff);
308 H_PUT_32 (abfd, src->e_flags, dst->e_flags);
309 H_PUT_16 (abfd, src->e_ehsize, dst->e_ehsize);
310 H_PUT_16 (abfd, src->e_phentsize, dst->e_phentsize);
311 H_PUT_16 (abfd, src->e_phnum, dst->e_phnum);
312 H_PUT_16 (abfd, src->e_shentsize, dst->e_shentsize);
314 if (tmp >= SHN_LORESERVE)
316 H_PUT_16 (abfd, tmp, dst->e_shnum);
317 tmp = src->e_shstrndx;
318 if (tmp >= SHN_LORESERVE)
320 H_PUT_16 (abfd, tmp, dst->e_shstrndx);
323 /* Translate an ELF section header table entry in external format into an
324 ELF section header table entry in internal format. */
327 elf_swap_shdr_in (abfd, src, dst)
329 const Elf_External_Shdr *src;
330 Elf_Internal_Shdr *dst;
332 int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma;
334 dst->sh_name = H_GET_32 (abfd, src->sh_name);
335 dst->sh_type = H_GET_32 (abfd, src->sh_type);
336 dst->sh_flags = H_GET_WORD (abfd, src->sh_flags);
338 dst->sh_addr = H_GET_SIGNED_WORD (abfd, src->sh_addr);
340 dst->sh_addr = H_GET_WORD (abfd, src->sh_addr);
341 dst->sh_offset = H_GET_WORD (abfd, src->sh_offset);
342 dst->sh_size = H_GET_WORD (abfd, src->sh_size);
343 dst->sh_link = H_GET_32 (abfd, src->sh_link);
344 dst->sh_info = H_GET_32 (abfd, src->sh_info);
345 dst->sh_addralign = H_GET_WORD (abfd, src->sh_addralign);
346 dst->sh_entsize = H_GET_WORD (abfd, src->sh_entsize);
347 dst->bfd_section = NULL;
348 dst->contents = NULL;
351 /* Translate an ELF section header table entry in internal format into an
352 ELF section header table entry in external format. */
355 elf_swap_shdr_out (abfd, src, dst)
357 const Elf_Internal_Shdr *src;
358 Elf_External_Shdr *dst;
360 /* note that all elements of dst are *arrays of unsigned char* already... */
361 H_PUT_32 (abfd, src->sh_name, dst->sh_name);
362 H_PUT_32 (abfd, src->sh_type, dst->sh_type);
363 H_PUT_WORD (abfd, src->sh_flags, dst->sh_flags);
364 H_PUT_WORD (abfd, src->sh_addr, dst->sh_addr);
365 H_PUT_WORD (abfd, src->sh_offset, dst->sh_offset);
366 H_PUT_WORD (abfd, src->sh_size, dst->sh_size);
367 H_PUT_32 (abfd, src->sh_link, dst->sh_link);
368 H_PUT_32 (abfd, src->sh_info, dst->sh_info);
369 H_PUT_WORD (abfd, src->sh_addralign, dst->sh_addralign);
370 H_PUT_WORD (abfd, src->sh_entsize, dst->sh_entsize);
373 /* Translate an ELF program header table entry in external format into an
374 ELF program header table entry in internal format. */
377 elf_swap_phdr_in (abfd, src, dst)
379 const Elf_External_Phdr *src;
380 Elf_Internal_Phdr *dst;
382 int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma;
384 dst->p_type = H_GET_32 (abfd, src->p_type);
385 dst->p_flags = H_GET_32 (abfd, src->p_flags);
386 dst->p_offset = H_GET_WORD (abfd, src->p_offset);
389 dst->p_vaddr = H_GET_SIGNED_WORD (abfd, src->p_vaddr);
390 dst->p_paddr = H_GET_SIGNED_WORD (abfd, src->p_paddr);
394 dst->p_vaddr = H_GET_WORD (abfd, src->p_vaddr);
395 dst->p_paddr = H_GET_WORD (abfd, src->p_paddr);
397 dst->p_filesz = H_GET_WORD (abfd, src->p_filesz);
398 dst->p_memsz = H_GET_WORD (abfd, src->p_memsz);
399 dst->p_align = H_GET_WORD (abfd, src->p_align);
403 elf_swap_phdr_out (abfd, src, dst)
405 const Elf_Internal_Phdr *src;
406 Elf_External_Phdr *dst;
408 /* note that all elements of dst are *arrays of unsigned char* already... */
409 H_PUT_32 (abfd, src->p_type, dst->p_type);
410 H_PUT_WORD (abfd, src->p_offset, dst->p_offset);
411 H_PUT_WORD (abfd, src->p_vaddr, dst->p_vaddr);
412 H_PUT_WORD (abfd, src->p_paddr, dst->p_paddr);
413 H_PUT_WORD (abfd, src->p_filesz, dst->p_filesz);
414 H_PUT_WORD (abfd, src->p_memsz, dst->p_memsz);
415 H_PUT_32 (abfd, src->p_flags, dst->p_flags);
416 H_PUT_WORD (abfd, src->p_align, dst->p_align);
419 /* Translate an ELF reloc from external format to internal format. */
421 elf_swap_reloc_in (abfd, s, dst)
424 Elf_Internal_Rela *dst;
426 const Elf_External_Rel *src = (const Elf_External_Rel *) s;
427 dst->r_offset = H_GET_WORD (abfd, src->r_offset);
428 dst->r_info = H_GET_WORD (abfd, src->r_info);
433 elf_swap_reloca_in (abfd, s, dst)
436 Elf_Internal_Rela *dst;
438 const Elf_External_Rela *src = (const Elf_External_Rela *) s;
439 dst->r_offset = H_GET_WORD (abfd, src->r_offset);
440 dst->r_info = H_GET_WORD (abfd, src->r_info);
441 dst->r_addend = H_GET_SIGNED_WORD (abfd, src->r_addend);
444 /* Translate an ELF reloc from internal format to external format. */
446 elf_swap_reloc_out (abfd, src, d)
448 const Elf_Internal_Rela *src;
451 Elf_External_Rel *dst = (Elf_External_Rel *) d;
452 H_PUT_WORD (abfd, src->r_offset, dst->r_offset);
453 H_PUT_WORD (abfd, src->r_info, dst->r_info);
457 elf_swap_reloca_out (abfd, src, d)
459 const Elf_Internal_Rela *src;
462 Elf_External_Rela *dst = (Elf_External_Rela *) d;
463 H_PUT_WORD (abfd, src->r_offset, dst->r_offset);
464 H_PUT_WORD (abfd, src->r_info, dst->r_info);
465 H_PUT_SIGNED_WORD (abfd, src->r_addend, dst->r_addend);
469 elf_swap_dyn_in (abfd, p, dst)
472 Elf_Internal_Dyn *dst;
474 const Elf_External_Dyn *src = (const Elf_External_Dyn *) p;
476 dst->d_tag = H_GET_WORD (abfd, src->d_tag);
477 dst->d_un.d_val = H_GET_WORD (abfd, src->d_un.d_val);
481 elf_swap_dyn_out (abfd, src, p)
483 const Elf_Internal_Dyn *src;
486 Elf_External_Dyn *dst = (Elf_External_Dyn *) p;
488 H_PUT_WORD (abfd, src->d_tag, dst->d_tag);
489 H_PUT_WORD (abfd, src->d_un.d_val, dst->d_un.d_val);
492 /* ELF .o/exec file reading */
494 /* Begin processing a given object.
496 First we validate the file by reading in the ELF header and checking
499 static INLINE bfd_boolean
501 Elf_External_Ehdr *x_ehdrp;
503 return ((x_ehdrp->e_ident[EI_MAG0] == ELFMAG0)
504 && (x_ehdrp->e_ident[EI_MAG1] == ELFMAG1)
505 && (x_ehdrp->e_ident[EI_MAG2] == ELFMAG2)
506 && (x_ehdrp->e_ident[EI_MAG3] == ELFMAG3));
509 /* Check to see if the file associated with ABFD matches the target vector
512 Note that we may be called several times with the same ABFD, but different
513 target vectors, most of which will not match. We have to avoid leaving
514 any side effects in ABFD, or any data it points to (like tdata), if the
515 file does not match the target vector. */
521 Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
522 Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
523 Elf_External_Shdr x_shdr; /* Section header table entry, external form */
524 Elf_Internal_Shdr i_shdr;
525 Elf_Internal_Shdr *i_shdrp; /* Section header table, internal form */
526 unsigned int shindex;
527 char *shstrtab; /* Internal copy of section header stringtab */
528 struct elf_backend_data *ebd;
529 struct bfd_preserve preserve;
533 preserve.marker = NULL;
535 /* Read in the ELF header in external format. */
537 if (bfd_bread ((PTR) & x_ehdr, (bfd_size_type) sizeof (x_ehdr), abfd)
540 if (bfd_get_error () != bfd_error_system_call)
541 goto got_wrong_format_error;
546 /* Now check to see if we have a valid ELF file, and one that BFD can
547 make use of. The magic number must match, the address size ('class')
548 and byte-swapping must match our XVEC entry, and it must have a
549 section header table (FIXME: See comments re sections at top of this
552 if (! elf_file_p (&x_ehdr)
553 || x_ehdr.e_ident[EI_VERSION] != EV_CURRENT
554 || x_ehdr.e_ident[EI_CLASS] != ELFCLASS)
555 goto got_wrong_format_error;
557 /* Check that file's byte order matches xvec's */
558 switch (x_ehdr.e_ident[EI_DATA])
560 case ELFDATA2MSB: /* Big-endian */
561 if (! bfd_header_big_endian (abfd))
562 goto got_wrong_format_error;
564 case ELFDATA2LSB: /* Little-endian */
565 if (! bfd_header_little_endian (abfd))
566 goto got_wrong_format_error;
568 case ELFDATANONE: /* No data encoding specified */
569 default: /* Unknown data encoding specified */
570 goto got_wrong_format_error;
573 /* Allocate an instance of the elf_obj_tdata structure and hook it up to
574 the tdata pointer in the bfd. */
576 amt = sizeof (struct elf_obj_tdata);
577 preserve.marker = bfd_zalloc (abfd, amt);
578 if (preserve.marker == NULL)
580 if (!bfd_preserve_save (abfd, &preserve))
583 elf_tdata (abfd) = preserve.marker;
585 /* Now that we know the byte order, swap in the rest of the header */
586 i_ehdrp = elf_elfheader (abfd);
587 elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp);
589 elf_debug_file (i_ehdrp);
592 /* Reject ET_CORE (header indicates core file, not object file) */
593 if (i_ehdrp->e_type == ET_CORE)
594 goto got_wrong_format_error;
596 /* If this is a relocatable file and there is no section header
597 table, then we're hosed. */
598 if (i_ehdrp->e_shoff == 0 && i_ehdrp->e_type == ET_REL)
599 goto got_wrong_format_error;
601 /* As a simple sanity check, verify that the what BFD thinks is the
602 size of each section header table entry actually matches the size
603 recorded in the file, but only if there are any sections. */
604 if (i_ehdrp->e_shentsize != sizeof (x_shdr) && i_ehdrp->e_shnum != 0)
605 goto got_wrong_format_error;
607 /* Further sanity check. */
608 if (i_ehdrp->e_shoff == 0 && i_ehdrp->e_shnum != 0)
609 goto got_wrong_format_error;
611 ebd = get_elf_backend_data (abfd);
613 /* Check that the ELF e_machine field matches what this particular
614 BFD format expects. */
615 if (ebd->elf_machine_code != i_ehdrp->e_machine
616 && (ebd->elf_machine_alt1 == 0
617 || i_ehdrp->e_machine != ebd->elf_machine_alt1)
618 && (ebd->elf_machine_alt2 == 0
619 || i_ehdrp->e_machine != ebd->elf_machine_alt2))
621 const bfd_target * const *target_ptr;
623 if (ebd->elf_machine_code != EM_NONE)
624 goto got_wrong_format_error;
626 /* This is the generic ELF target. Let it match any ELF target
627 for which we do not have a specific backend. */
628 for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++)
630 struct elf_backend_data *back;
632 if ((*target_ptr)->flavour != bfd_target_elf_flavour)
634 back = (struct elf_backend_data *) (*target_ptr)->backend_data;
635 if (back->elf_machine_code == i_ehdrp->e_machine
636 || (back->elf_machine_alt1 != 0
637 && back->elf_machine_alt1 == i_ehdrp->e_machine)
638 || (back->elf_machine_alt2 != 0
639 && back->elf_machine_alt2 == i_ehdrp->e_machine))
641 /* target_ptr is an ELF backend which matches this
642 object file, so reject the generic ELF target. */
643 goto got_wrong_format_error;
648 if (i_ehdrp->e_type == ET_EXEC)
649 abfd->flags |= EXEC_P;
650 else if (i_ehdrp->e_type == ET_DYN)
651 abfd->flags |= DYNAMIC;
653 if (i_ehdrp->e_phnum > 0)
654 abfd->flags |= D_PAGED;
656 if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0))
658 /* It's OK if this fails for the generic target. */
659 if (ebd->elf_machine_code != EM_NONE)
663 /* Remember the entry point specified in the ELF file header. */
664 bfd_set_start_address (abfd, i_ehdrp->e_entry);
666 if (i_ehdrp->e_shoff != 0)
668 /* Seek to the section header table in the file. */
669 if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_shoff, SEEK_SET) != 0)
672 /* Read the first section header at index 0, and convert to internal
674 if (bfd_bread ((PTR) & x_shdr, (bfd_size_type) sizeof x_shdr, abfd)
677 elf_swap_shdr_in (abfd, &x_shdr, &i_shdr);
679 /* If the section count is zero, the actual count is in the first
681 if (i_ehdrp->e_shnum == SHN_UNDEF)
682 i_ehdrp->e_shnum = i_shdr.sh_size;
684 /* And similarly for the string table index. */
685 if (i_ehdrp->e_shstrndx == SHN_XINDEX)
686 i_ehdrp->e_shstrndx = i_shdr.sh_link;
689 /* Allocate space for a copy of the section header table in
691 if (i_ehdrp->e_shnum != 0)
693 Elf_Internal_Shdr *shdrp;
694 unsigned int num_sec;
696 amt = sizeof (*i_shdrp) * i_ehdrp->e_shnum;
697 i_shdrp = (Elf_Internal_Shdr *) bfd_alloc (abfd, amt);
700 num_sec = i_ehdrp->e_shnum;
701 if (num_sec > SHN_LORESERVE)
702 num_sec += SHN_HIRESERVE + 1 - SHN_LORESERVE;
703 elf_numsections (abfd) = num_sec;
704 amt = sizeof (i_shdrp) * num_sec;
705 elf_elfsections (abfd) = (Elf_Internal_Shdr **) bfd_alloc (abfd, amt);
706 if (!elf_elfsections (abfd))
709 memcpy (i_shdrp, &i_shdr, sizeof (*i_shdrp));
712 if (num_sec > SHN_LORESERVE)
714 for ( ; shindex < SHN_LORESERVE; shindex++)
715 elf_elfsections (abfd)[shindex] = shdrp++;
716 for ( ; shindex < SHN_HIRESERVE + 1; shindex++)
717 elf_elfsections (abfd)[shindex] = i_shdrp;
719 for ( ; shindex < num_sec; shindex++)
720 elf_elfsections (abfd)[shindex] = shdrp++;
722 /* Read in the rest of the section header table and convert it
724 for (shindex = 1; shindex < i_ehdrp->e_shnum; shindex++)
726 if (bfd_bread ((PTR) & x_shdr, (bfd_size_type) sizeof x_shdr, abfd)
729 elf_swap_shdr_in (abfd, &x_shdr, i_shdrp + shindex);
731 /* If the section is loaded, but not page aligned, clear
733 if (i_shdrp[shindex].sh_size != 0
734 && (i_shdrp[shindex].sh_flags & SHF_ALLOC) != 0
735 && i_shdrp[shindex].sh_type != SHT_NOBITS
736 && (((i_shdrp[shindex].sh_addr - i_shdrp[shindex].sh_offset)
739 abfd->flags &= ~D_PAGED;
743 if (i_ehdrp->e_shstrndx && i_ehdrp->e_shoff)
745 if (! bfd_section_from_shdr (abfd, i_ehdrp->e_shstrndx))
749 /* Read in the program headers. */
750 if (i_ehdrp->e_phnum == 0)
751 elf_tdata (abfd)->phdr = NULL;
754 Elf_Internal_Phdr *i_phdr;
757 amt = i_ehdrp->e_phnum * sizeof (Elf_Internal_Phdr);
758 elf_tdata (abfd)->phdr = (Elf_Internal_Phdr *) bfd_alloc (abfd, amt);
759 if (elf_tdata (abfd)->phdr == NULL)
761 if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_phoff, SEEK_SET) != 0)
763 i_phdr = elf_tdata (abfd)->phdr;
764 for (i = 0; i < i_ehdrp->e_phnum; i++, i_phdr++)
766 Elf_External_Phdr x_phdr;
768 if (bfd_bread ((PTR) &x_phdr, (bfd_size_type) sizeof x_phdr, abfd)
771 elf_swap_phdr_in (abfd, &x_phdr, i_phdr);
775 /* Read in the string table containing the names of the sections. We
776 will need the base pointer to this table later. */
777 /* We read this inline now, so that we don't have to go through
778 bfd_section_from_shdr with it (since this particular strtab is
779 used to find all of the ELF section names.) */
781 if (i_ehdrp->e_shstrndx != 0 && i_ehdrp->e_shoff)
783 unsigned int num_sec;
785 shstrtab = bfd_elf_get_str_section (abfd, i_ehdrp->e_shstrndx);
789 /* Once all of the section headers have been read and converted, we
790 can start processing them. Note that the first section header is
791 a dummy placeholder entry, so we ignore it. */
792 num_sec = elf_numsections (abfd);
793 for (shindex = 1; shindex < num_sec; shindex++)
795 if (! bfd_section_from_shdr (abfd, shindex))
797 if (shindex == SHN_LORESERVE - 1)
798 shindex += SHN_HIRESERVE + 1 - SHN_LORESERVE;
802 /* Let the backend double check the format and override global
804 if (ebd->elf_backend_object_p)
806 if (! (*ebd->elf_backend_object_p) (abfd))
807 goto got_wrong_format_error;
810 /* If we have created any reloc sections that are associated with
811 debugging sections, mark the reloc sections as debugging as well. */
812 for (s = abfd->sections; s != NULL; s = s->next)
814 if ((elf_section_data (s)->this_hdr.sh_type == SHT_REL
815 || elf_section_data (s)->this_hdr.sh_type == SHT_RELA)
816 && elf_section_data (s)->this_hdr.sh_info > 0)
818 unsigned long targ_index;
821 targ_index = elf_section_data (s)->this_hdr.sh_info;
822 targ_sec = bfd_section_from_elf_index (abfd, targ_index);
824 && (targ_sec->flags & SEC_DEBUGGING) != 0)
825 s->flags |= SEC_DEBUGGING;
829 bfd_preserve_finish (abfd, &preserve);
832 got_wrong_format_error:
833 /* There is way too much undoing of half-known state here. The caller,
834 bfd_check_format_matches, really shouldn't iterate on live bfd's to
835 check match/no-match like it does. We have to rely on that a call to
836 bfd_default_set_arch_mach with the previously known mach, undoes what
837 was done by the first bfd_default_set_arch_mach (with mach 0) here.
838 For this to work, only elf-data and the mach may be changed by the
839 target-specific elf_backend_object_p function. Note that saving the
840 whole bfd here and restoring it would be even worse; the first thing
841 you notice is that the cached bfd file position gets out of sync. */
842 bfd_set_error (bfd_error_wrong_format);
845 if (preserve.marker != NULL)
846 bfd_preserve_restore (abfd, &preserve);
850 /* ELF .o/exec file writing */
852 /* Write out the relocs. */
855 elf_write_relocs (abfd, sec, data)
860 bfd_boolean *failedp = (bfd_boolean *) data;
861 Elf_Internal_Shdr *rela_hdr;
863 void (*swap_out) PARAMS ((bfd *, const Elf_Internal_Rela *, bfd_byte *));
870 /* If we have already failed, don't do anything. */
874 if ((sec->flags & SEC_RELOC) == 0)
877 /* The linker backend writes the relocs out itself, and sets the
878 reloc_count field to zero to inhibit writing them here. Also,
879 sometimes the SEC_RELOC flag gets set even when there aren't any
881 if (sec->reloc_count == 0)
884 rela_hdr = &elf_section_data (sec)->rel_hdr;
886 rela_hdr->sh_size = rela_hdr->sh_entsize * sec->reloc_count;
887 rela_hdr->contents = (PTR) bfd_alloc (abfd, rela_hdr->sh_size);
888 if (rela_hdr->contents == NULL)
894 /* Figure out whether the relocations are RELA or REL relocations. */
895 if (rela_hdr->sh_type == SHT_RELA)
897 swap_out = elf_swap_reloca_out;
898 extsize = sizeof (Elf_External_Rela);
900 else if (rela_hdr->sh_type == SHT_REL)
902 swap_out = elf_swap_reloc_out;
903 extsize = sizeof (Elf_External_Rel);
906 /* Every relocation section should be either an SHT_RELA or an
910 /* The address of an ELF reloc is section relative for an object
911 file, and absolute for an executable file or shared library.
912 The address of a BFD reloc is always section relative. */
914 if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
915 addr_offset = sec->vma;
917 /* orelocation has the data, reloc_count has the count... */
920 dst_rela = rela_hdr->contents;
922 for (idx = 0; idx < sec->reloc_count; idx++, dst_rela += extsize)
924 Elf_Internal_Rela src_rela;
929 ptr = sec->orelocation[idx];
930 sym = *ptr->sym_ptr_ptr;
933 else if (bfd_is_abs_section (sym->section) && sym->value == 0)
938 n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym);
947 if ((*ptr->sym_ptr_ptr)->the_bfd != NULL
948 && (*ptr->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec
949 && ! _bfd_elf_validate_reloc (abfd, ptr))
955 src_rela.r_offset = ptr->address + addr_offset;
956 src_rela.r_info = ELF_R_INFO (n, ptr->howto->type);
957 src_rela.r_addend = ptr->addend;
958 (*swap_out) (abfd, &src_rela, dst_rela);
962 /* Write out the program headers. */
965 elf_write_out_phdrs (abfd, phdr, count)
967 const Elf_Internal_Phdr *phdr;
972 Elf_External_Phdr extphdr;
973 elf_swap_phdr_out (abfd, phdr, &extphdr);
974 if (bfd_bwrite (&extphdr, (bfd_size_type) sizeof (Elf_External_Phdr),
975 abfd) != sizeof (Elf_External_Phdr))
982 /* Write out the section headers and the ELF file header. */
985 elf_write_shdrs_and_ehdr (abfd)
988 Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
989 Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
990 Elf_External_Shdr *x_shdrp; /* Section header table, external form */
991 Elf_Internal_Shdr **i_shdrp; /* Section header table, internal form */
995 i_ehdrp = elf_elfheader (abfd);
996 i_shdrp = elf_elfsections (abfd);
998 /* swap the header before spitting it out... */
1001 elf_debug_file (i_ehdrp);
1003 elf_swap_ehdr_out (abfd, i_ehdrp, &x_ehdr);
1004 amt = sizeof (x_ehdr);
1005 if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
1006 || bfd_bwrite ((PTR) & x_ehdr, amt, abfd) != amt)
1009 /* Some fields in the first section header handle overflow of ehdr
1011 if (i_ehdrp->e_shnum >= SHN_LORESERVE)
1012 i_shdrp[0]->sh_size = i_ehdrp->e_shnum;
1013 if (i_ehdrp->e_shstrndx >= SHN_LORESERVE)
1014 i_shdrp[0]->sh_link = i_ehdrp->e_shstrndx;
1016 /* at this point we've concocted all the ELF sections... */
1017 amt = i_ehdrp->e_shnum;
1018 amt *= sizeof (*x_shdrp);
1019 x_shdrp = (Elf_External_Shdr *) bfd_alloc (abfd, amt);
1023 for (count = 0; count < i_ehdrp->e_shnum; i_shdrp++, count++)
1026 elf_debug_section (count, *i_shdrp);
1028 elf_swap_shdr_out (abfd, *i_shdrp, x_shdrp + count);
1030 if (count == SHN_LORESERVE - 1)
1031 i_shdrp += SHN_HIRESERVE + 1 - SHN_LORESERVE;
1033 if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_shoff, SEEK_SET) != 0
1034 || bfd_bwrite ((PTR) x_shdrp, amt, abfd) != amt)
1037 /* need to dump the string table too... */
1043 elf_slurp_symbol_table (abfd, symptrs, dynamic)
1045 asymbol **symptrs; /* Buffer for generated bfd symbols */
1046 bfd_boolean dynamic;
1048 Elf_Internal_Shdr *hdr;
1049 Elf_Internal_Shdr *verhdr;
1050 unsigned long symcount; /* Number of external ELF symbols */
1051 elf_symbol_type *sym; /* Pointer to current bfd symbol */
1052 elf_symbol_type *symbase; /* Buffer for generated bfd symbols */
1053 Elf_Internal_Sym *isym;
1054 Elf_Internal_Sym *isymend;
1055 Elf_Internal_Sym *isymbuf = NULL;
1056 Elf_External_Versym *xver;
1057 Elf_External_Versym *xverbuf = NULL;
1058 struct elf_backend_data *ebd;
1061 /* Read each raw ELF symbol, converting from external ELF form to
1062 internal ELF form, and then using the information to create a
1063 canonical bfd symbol table entry.
1065 Note that we allocate the initial bfd canonical symbol buffer
1066 based on a one-to-one mapping of the ELF symbols to canonical
1067 symbols. We actually use all the ELF symbols, so there will be no
1068 space left over at the end. When we have all the symbols, we
1069 build the caller's pointer vector. */
1073 hdr = &elf_tdata (abfd)->symtab_hdr;
1078 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
1079 if (elf_dynversym (abfd) == 0)
1082 verhdr = &elf_tdata (abfd)->dynversym_hdr;
1083 if ((elf_tdata (abfd)->dynverdef_section != 0
1084 && elf_tdata (abfd)->verdef == NULL)
1085 || (elf_tdata (abfd)->dynverref_section != 0
1086 && elf_tdata (abfd)->verref == NULL))
1088 if (! _bfd_elf_slurp_version_tables (abfd))
1093 ebd = get_elf_backend_data (abfd);
1094 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
1096 sym = symbase = NULL;
1099 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, symcount, 0,
1101 if (isymbuf == NULL)
1105 amt *= sizeof (elf_symbol_type);
1106 symbase = (elf_symbol_type *) bfd_zalloc (abfd, amt);
1107 if (symbase == (elf_symbol_type *) NULL)
1110 /* Read the raw ELF version symbol information. */
1112 && verhdr->sh_size / sizeof (Elf_External_Versym) != symcount)
1114 (*_bfd_error_handler)
1115 (_("%s: version count (%ld) does not match symbol count (%ld)"),
1117 (long) (verhdr->sh_size / sizeof (Elf_External_Versym)),
1120 /* Slurp in the symbols without the version information,
1121 since that is more helpful than just quitting. */
1127 if (bfd_seek (abfd, verhdr->sh_offset, SEEK_SET) != 0)
1130 xverbuf = (Elf_External_Versym *) bfd_malloc (verhdr->sh_size);
1131 if (xverbuf == NULL && verhdr->sh_size != 0)
1134 if (bfd_bread ((PTR) xverbuf, verhdr->sh_size, abfd)
1139 /* Skip first symbol, which is a null dummy. */
1143 isymend = isymbuf + symcount;
1144 for (isym = isymbuf + 1, sym = symbase; isym < isymend; isym++, sym++)
1146 memcpy (&sym->internal_elf_sym, isym, sizeof (Elf_Internal_Sym));
1147 sym->symbol.the_bfd = abfd;
1149 sym->symbol.name = bfd_elf_string_from_elf_section (abfd,
1153 sym->symbol.value = isym->st_value;
1155 if (isym->st_shndx == SHN_UNDEF)
1157 sym->symbol.section = bfd_und_section_ptr;
1159 else if (isym->st_shndx < SHN_LORESERVE
1160 || isym->st_shndx > SHN_HIRESERVE)
1162 sym->symbol.section = section_from_elf_index (abfd,
1164 if (sym->symbol.section == NULL)
1166 /* This symbol is in a section for which we did not
1167 create a BFD section. Just use bfd_abs_section,
1168 although it is wrong. FIXME. */
1169 sym->symbol.section = bfd_abs_section_ptr;
1172 else if (isym->st_shndx == SHN_ABS)
1174 sym->symbol.section = bfd_abs_section_ptr;
1176 else if (isym->st_shndx == SHN_COMMON)
1178 sym->symbol.section = bfd_com_section_ptr;
1179 /* Elf puts the alignment into the `value' field, and
1180 the size into the `size' field. BFD wants to see the
1181 size in the value field, and doesn't care (at the
1182 moment) about the alignment. */
1183 sym->symbol.value = isym->st_size;
1186 sym->symbol.section = bfd_abs_section_ptr;
1188 /* If this is a relocatable file, then the symbol value is
1189 already section relative. */
1190 if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
1191 sym->symbol.value -= sym->symbol.section->vma;
1193 switch (ELF_ST_BIND (isym->st_info))
1196 sym->symbol.flags |= BSF_LOCAL;
1199 if (isym->st_shndx != SHN_UNDEF && isym->st_shndx != SHN_COMMON)
1200 sym->symbol.flags |= BSF_GLOBAL;
1203 sym->symbol.flags |= BSF_WEAK;
1207 switch (ELF_ST_TYPE (isym->st_info))
1210 sym->symbol.flags |= BSF_SECTION_SYM | BSF_DEBUGGING;
1213 sym->symbol.flags |= BSF_FILE | BSF_DEBUGGING;
1216 sym->symbol.flags |= BSF_FUNCTION;
1219 sym->symbol.flags |= BSF_OBJECT;
1224 sym->symbol.flags |= BSF_DYNAMIC;
1228 Elf_Internal_Versym iversym;
1230 _bfd_elf_swap_versym_in (abfd, xver, &iversym);
1231 sym->version = iversym.vs_vers;
1235 /* Do some backend-specific processing on this symbol. */
1236 if (ebd->elf_backend_symbol_processing)
1237 (*ebd->elf_backend_symbol_processing) (abfd, &sym->symbol);
1241 /* Do some backend-specific processing on this symbol table. */
1242 if (ebd->elf_backend_symbol_table_processing)
1243 (*ebd->elf_backend_symbol_table_processing) (abfd, symbase, symcount);
1245 /* We rely on the zalloc to clear out the final symbol entry. */
1247 symcount = sym - symbase;
1249 /* Fill in the user's symbol pointer vector if needed. */
1257 *symptrs++ = &sym->symbol;
1260 *symptrs = 0; /* Final null pointer */
1263 if (xverbuf != NULL)
1265 if (isymbuf != NULL && hdr->contents != (unsigned char *) isymbuf)
1270 if (xverbuf != NULL)
1272 if (isymbuf != NULL && hdr->contents != (unsigned char *) isymbuf)
1277 /* Read relocations for ASECT from REL_HDR. There are RELOC_COUNT of
1281 elf_slurp_reloc_table_from_section (abfd, asect, rel_hdr, reloc_count,
1282 relents, symbols, dynamic)
1285 Elf_Internal_Shdr *rel_hdr;
1286 bfd_size_type reloc_count;
1289 bfd_boolean dynamic;
1291 struct elf_backend_data * const ebd = get_elf_backend_data (abfd);
1292 PTR allocated = NULL;
1293 bfd_byte *native_relocs;
1297 unsigned int symcount;
1299 allocated = (PTR) bfd_malloc (rel_hdr->sh_size);
1300 if (allocated == NULL)
1303 if (bfd_seek (abfd, rel_hdr->sh_offset, SEEK_SET) != 0
1304 || (bfd_bread (allocated, rel_hdr->sh_size, abfd)
1305 != rel_hdr->sh_size))
1308 native_relocs = (bfd_byte *) allocated;
1310 entsize = rel_hdr->sh_entsize;
1311 BFD_ASSERT (entsize == sizeof (Elf_External_Rel)
1312 || entsize == sizeof (Elf_External_Rela));
1315 symcount = bfd_get_dynamic_symcount (abfd);
1317 symcount = bfd_get_symcount (abfd);
1319 for (i = 0, relent = relents;
1321 i++, relent++, native_relocs += entsize)
1323 Elf_Internal_Rela rela;
1325 if (entsize == sizeof (Elf_External_Rela))
1326 elf_swap_reloca_in (abfd, native_relocs, &rela);
1328 elf_swap_reloc_in (abfd, native_relocs, &rela);
1330 /* The address of an ELF reloc is section relative for an object
1331 file, and absolute for an executable file or shared library.
1332 The address of a normal BFD reloc is always section relative,
1333 and the address of a dynamic reloc is absolute.. */
1334 if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0 || dynamic)
1335 relent->address = rela.r_offset;
1337 relent->address = rela.r_offset - asect->vma;
1339 if (ELF_R_SYM (rela.r_info) == 0)
1340 relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
1341 else if (ELF_R_SYM (rela.r_info) > symcount)
1343 (*_bfd_error_handler)
1344 (_("%s(%s): relocation %d has invalid symbol index %ld"),
1345 abfd->filename, asect->name, i, ELF_R_SYM (rela.r_info));
1346 relent->sym_ptr_ptr = bfd_abs_section.symbol_ptr_ptr;
1352 ps = symbols + ELF_R_SYM (rela.r_info) - 1;
1355 /* Canonicalize ELF section symbols. FIXME: Why? */
1356 if ((s->flags & BSF_SECTION_SYM) == 0)
1357 relent->sym_ptr_ptr = ps;
1359 relent->sym_ptr_ptr = s->section->symbol_ptr_ptr;
1362 relent->addend = rela.r_addend;
1364 if ((entsize == sizeof (Elf_External_Rela)
1365 && ebd->elf_info_to_howto != NULL)
1366 || ebd->elf_info_to_howto_rel == NULL)
1367 (*ebd->elf_info_to_howto) (abfd, relent, &rela);
1369 (*ebd->elf_info_to_howto_rel) (abfd, relent, &rela);
1372 if (allocated != NULL)
1378 if (allocated != NULL)
1383 /* Read in and swap the external relocs. */
1386 elf_slurp_reloc_table (abfd, asect, symbols, dynamic)
1390 bfd_boolean dynamic;
1392 struct bfd_elf_section_data * const d = elf_section_data (asect);
1393 Elf_Internal_Shdr *rel_hdr;
1394 Elf_Internal_Shdr *rel_hdr2;
1395 bfd_size_type reloc_count;
1396 bfd_size_type reloc_count2;
1400 if (asect->relocation != NULL)
1405 if ((asect->flags & SEC_RELOC) == 0
1406 || asect->reloc_count == 0)
1409 rel_hdr = &d->rel_hdr;
1410 reloc_count = NUM_SHDR_ENTRIES (rel_hdr);
1411 rel_hdr2 = d->rel_hdr2;
1412 reloc_count2 = (rel_hdr2 ? NUM_SHDR_ENTRIES (rel_hdr2) : 0);
1414 BFD_ASSERT (asect->reloc_count == reloc_count + reloc_count2);
1415 BFD_ASSERT (asect->rel_filepos == rel_hdr->sh_offset
1416 || (rel_hdr2 && asect->rel_filepos == rel_hdr2->sh_offset));
1421 /* Note that ASECT->RELOC_COUNT tends not to be accurate in this
1422 case because relocations against this section may use the
1423 dynamic symbol table, and in that case bfd_section_from_shdr
1424 in elf.c does not update the RELOC_COUNT. */
1425 if (asect->_raw_size == 0)
1428 rel_hdr = &d->this_hdr;
1429 reloc_count = NUM_SHDR_ENTRIES (rel_hdr);
1434 amt = (reloc_count + reloc_count2) * sizeof (arelent);
1435 relents = (arelent *) bfd_alloc (abfd, amt);
1436 if (relents == NULL)
1439 if (!elf_slurp_reloc_table_from_section (abfd, asect,
1440 rel_hdr, reloc_count,
1446 && !elf_slurp_reloc_table_from_section (abfd, asect,
1447 rel_hdr2, reloc_count2,
1448 relents + reloc_count,
1452 asect->relocation = relents;
1458 elf_debug_section (num, hdr)
1460 Elf_Internal_Shdr *hdr;
1462 fprintf (stderr, "\nSection#%d '%s' 0x%.8lx\n", num,
1463 hdr->bfd_section != NULL ? hdr->bfd_section->name : "",
1466 "sh_name = %ld\tsh_type = %ld\tsh_flags = %ld\n",
1467 (long) hdr->sh_name,
1468 (long) hdr->sh_type,
1469 (long) hdr->sh_flags);
1471 "sh_addr = %ld\tsh_offset = %ld\tsh_size = %ld\n",
1472 (long) hdr->sh_addr,
1473 (long) hdr->sh_offset,
1474 (long) hdr->sh_size);
1476 "sh_link = %ld\tsh_info = %ld\tsh_addralign = %ld\n",
1477 (long) hdr->sh_link,
1478 (long) hdr->sh_info,
1479 (long) hdr->sh_addralign);
1480 fprintf (stderr, "sh_entsize = %ld\n",
1481 (long) hdr->sh_entsize);
1486 elf_debug_file (ehdrp)
1487 Elf_Internal_Ehdr *ehdrp;
1489 fprintf (stderr, "e_entry = 0x%.8lx\n", (long) ehdrp->e_entry);
1490 fprintf (stderr, "e_phoff = %ld\n", (long) ehdrp->e_phoff);
1491 fprintf (stderr, "e_phnum = %ld\n", (long) ehdrp->e_phnum);
1492 fprintf (stderr, "e_phentsize = %ld\n", (long) ehdrp->e_phentsize);
1493 fprintf (stderr, "e_shoff = %ld\n", (long) ehdrp->e_shoff);
1494 fprintf (stderr, "e_shnum = %ld\n", (long) ehdrp->e_shnum);
1495 fprintf (stderr, "e_shentsize = %ld\n", (long) ehdrp->e_shentsize);
1499 elf_symbol_flags (flags)
1502 static char buffer[1024];
1505 if (flags & BSF_LOCAL)
1506 strcat (buffer, " local");
1508 if (flags & BSF_GLOBAL)
1509 strcat (buffer, " global");
1511 if (flags & BSF_DEBUGGING)
1512 strcat (buffer, " debug");
1514 if (flags & BSF_FUNCTION)
1515 strcat (buffer, " function");
1517 if (flags & BSF_KEEP)
1518 strcat (buffer, " keep");
1520 if (flags & BSF_KEEP_G)
1521 strcat (buffer, " keep_g");
1523 if (flags & BSF_WEAK)
1524 strcat (buffer, " weak");
1526 if (flags & BSF_SECTION_SYM)
1527 strcat (buffer, " section-sym");
1529 if (flags & BSF_OLD_COMMON)
1530 strcat (buffer, " old-common");
1532 if (flags & BSF_NOT_AT_END)
1533 strcat (buffer, " not-at-end");
1535 if (flags & BSF_CONSTRUCTOR)
1536 strcat (buffer, " constructor");
1538 if (flags & BSF_WARNING)
1539 strcat (buffer, " warning");
1541 if (flags & BSF_INDIRECT)
1542 strcat (buffer, " indirect");
1544 if (flags & BSF_FILE)
1545 strcat (buffer, " file");
1547 if (flags & DYNAMIC)
1548 strcat (buffer, " dynamic");
1550 if (flags & ~(BSF_LOCAL
1565 strcat (buffer, " unknown-bits");
1571 /* Create a new BFD as if by bfd_openr. Rather than opening a file,
1572 reconstruct an ELF file by reading the segments out of remote memory
1573 based on the ELF file header at EHDR_VMA and the ELF program headers it
1574 points to. If not null, *LOADBASEP is filled in with the difference
1575 between the VMAs from which the segments were read, and the VMAs the
1576 file headers (and hence BFD's idea of each section's VMA) put them at.
1578 The function TARGET_READ_MEMORY is called to copy LEN bytes from the
1579 remote memory at target address VMA into the local buffer at MYADDR; it
1580 should return zero on success or an `errno' code on failure. TEMPL must
1581 be a BFD for a target with the word size and byte order found in the
1585 NAME(_bfd_elf,bfd_from_remote_memory) (templ, ehdr_vma, loadbasep,
1590 int (*target_read_memory) PARAMS ((bfd_vma vma, char *myaddr, int len));
1592 Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
1593 Elf_Internal_Ehdr i_ehdr; /* Elf file header, internal form */
1594 Elf_External_Phdr *x_phdrs;
1595 Elf_Internal_Phdr *i_phdrs, *last_phdr;
1597 struct bfd_in_memory *bim;
1604 /* Read in the ELF header in external format. */
1605 err = target_read_memory (ehdr_vma, (char *) &x_ehdr, sizeof x_ehdr);
1608 bfd_set_error (bfd_error_system_call);
1613 /* Now check to see if we have a valid ELF file, and one that BFD can
1614 make use of. The magic number must match, the address size ('class')
1615 and byte-swapping must match our XVEC entry. */
1617 if (! elf_file_p (&x_ehdr)
1618 || x_ehdr.e_ident[EI_VERSION] != EV_CURRENT
1619 || x_ehdr.e_ident[EI_CLASS] != ELFCLASS)
1621 bfd_set_error (bfd_error_wrong_format);
1625 /* Check that file's byte order matches xvec's */
1626 switch (x_ehdr.e_ident[EI_DATA])
1628 case ELFDATA2MSB: /* Big-endian */
1629 if (! bfd_header_big_endian (templ))
1631 bfd_set_error (bfd_error_wrong_format);
1635 case ELFDATA2LSB: /* Little-endian */
1636 if (! bfd_header_little_endian (templ))
1638 bfd_set_error (bfd_error_wrong_format);
1642 case ELFDATANONE: /* No data encoding specified */
1643 default: /* Unknown data encoding specified */
1644 bfd_set_error (bfd_error_wrong_format);
1648 elf_swap_ehdr_in (templ, &x_ehdr, &i_ehdr);
1650 /* The file header tells where to find the program headers.
1651 These are what we use to actually choose what to read. */
1653 if (i_ehdr.e_phentsize != sizeof (Elf_External_Phdr) || i_ehdr.e_phnum == 0)
1655 bfd_set_error (bfd_error_wrong_format);
1659 x_phdrs = (Elf_External_Phdr *)
1660 bfd_malloc (i_ehdr.e_phnum * (sizeof *x_phdrs + sizeof *i_phdrs));
1661 if (x_phdrs == NULL)
1663 bfd_set_error (bfd_error_no_memory);
1666 err = target_read_memory (ehdr_vma + i_ehdr.e_phoff, (char *) x_phdrs,
1667 i_ehdr.e_phnum * sizeof x_phdrs[0]);
1671 bfd_set_error (bfd_error_system_call);
1675 i_phdrs = (Elf_Internal_Phdr *) &x_phdrs[i_ehdr.e_phnum];
1679 loadbase = ehdr_vma;
1680 for (i = 0; i < i_ehdr.e_phnum; ++i)
1682 elf_swap_phdr_in (templ, &x_phdrs[i], &i_phdrs[i]);
1683 if (i_phdrs[i].p_type == PT_LOAD)
1685 bfd_vma segment_end;
1686 segment_end = (i_phdrs[i].p_offset + i_phdrs[i].p_filesz
1687 + i_phdrs[i].p_align - 1) & -i_phdrs[i].p_align;
1688 if (segment_end > (bfd_vma) contents_size)
1689 contents_size = segment_end;
1691 if ((i_phdrs[i].p_offset & -i_phdrs[i].p_align) == 0)
1692 loadbase = ehdr_vma - (i_phdrs[i].p_vaddr & -i_phdrs[i].p_align);
1694 last_phdr = &i_phdrs[i];
1697 if (last_phdr == NULL)
1699 /* There were no PT_LOAD segments, so we don't have anything to read. */
1701 bfd_set_error (bfd_error_wrong_format);
1705 /* Trim the last segment so we don't bother with zeros in the last page
1706 that are off the end of the file. However, if the extra bit in that
1707 page includes the section headers, keep them. */
1708 if ((bfd_vma) contents_size > last_phdr->p_offset + last_phdr->p_filesz
1709 && (bfd_vma) contents_size >= (i_ehdr.e_shoff
1710 + i_ehdr.e_shnum * i_ehdr.e_shentsize))
1712 contents_size = last_phdr->p_offset + last_phdr->p_filesz;
1713 if ((bfd_vma) contents_size < (i_ehdr.e_shoff
1714 + i_ehdr.e_shnum * i_ehdr.e_shentsize))
1715 contents_size = i_ehdr.e_shoff + i_ehdr.e_shnum * i_ehdr.e_shentsize;
1718 contents_size = last_phdr->p_offset + last_phdr->p_filesz;
1720 /* Now we know the size of the whole image we want read in. */
1721 contents = (char *) bfd_zmalloc ((bfd_size_type) contents_size);
1722 if (contents == NULL)
1725 bfd_set_error (bfd_error_no_memory);
1729 for (i = 0; i < i_ehdr.e_phnum; ++i)
1730 if (i_phdrs[i].p_type == PT_LOAD)
1732 bfd_vma start = i_phdrs[i].p_offset & -i_phdrs[i].p_align;
1733 bfd_vma end = (i_phdrs[i].p_offset + i_phdrs[i].p_filesz
1734 + i_phdrs[i].p_align - 1) & -i_phdrs[i].p_align;
1735 if (end > (bfd_vma) contents_size)
1736 end = contents_size;
1737 err = target_read_memory ((loadbase + i_phdrs[i].p_vaddr)
1738 & -i_phdrs[i].p_align,
1739 contents + start, end - start);
1744 bfd_set_error (bfd_error_system_call);
1751 /* If the segments visible in memory didn't include the section headers,
1752 then clear them from the file header. */
1753 if ((bfd_vma) contents_size < (i_ehdr.e_shoff
1754 + i_ehdr.e_shnum * i_ehdr.e_shentsize))
1756 memset (&x_ehdr.e_shoff, 0, sizeof x_ehdr.e_shoff);
1757 memset (&x_ehdr.e_shnum, 0, sizeof x_ehdr.e_shnum);
1758 memset (&x_ehdr.e_shstrndx, 0, sizeof x_ehdr.e_shstrndx);
1761 /* This will normally have been in the first PT_LOAD segment. But it
1762 conceivably could be missing, and we might have just changed it. */
1763 memcpy (contents, &x_ehdr, sizeof x_ehdr);
1765 /* Now we have a memory image of the ELF file contents. Make a BFD. */
1766 bim = ((struct bfd_in_memory *)
1767 bfd_malloc ((bfd_size_type) sizeof (struct bfd_in_memory)));
1771 bfd_set_error (bfd_error_no_memory);
1774 nbfd = _bfd_new_bfd ();
1779 bfd_set_error (bfd_error_no_memory);
1782 nbfd->filename = "<in-memory>";
1783 nbfd->xvec = templ->xvec;
1784 bim->size = contents_size;
1785 bim->buffer = contents;
1786 nbfd->iostream = (PTR) bim;
1787 nbfd->flags = BFD_IN_MEMORY;
1788 nbfd->direction = read_direction;
1789 nbfd->mtime = time (NULL);
1790 nbfd->mtime_set = TRUE;
1793 *loadbasep = loadbase;
1797 #include "elfcore.h"
1798 #include "elflink.h"
1800 /* Size-dependent data and functions. */
1801 const struct elf_size_info NAME(_bfd_elf,size_info) = {
1802 sizeof (Elf_External_Ehdr),
1803 sizeof (Elf_External_Phdr),
1804 sizeof (Elf_External_Shdr),
1805 sizeof (Elf_External_Rel),
1806 sizeof (Elf_External_Rela),
1807 sizeof (Elf_External_Sym),
1808 sizeof (Elf_External_Dyn),
1809 sizeof (Elf_External_Note),
1812 ARCH_SIZE, LOG_FILE_ALIGN,
1813 ELFCLASS, EV_CURRENT,
1814 elf_write_out_phdrs,
1815 elf_write_shdrs_and_ehdr,
1818 elf_swap_symbol_out,
1819 elf_slurp_reloc_table,
1820 elf_slurp_symbol_table,