1 /* ELF executable support for BFD.
2 Copyright 1991, 1992, 1993, 1994, 1995 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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
32 /* Problems and other issues to resolve.
34 (1) BFD expects there to be some fixed number of "sections" in
35 the object file. I.E. there is a "section_count" variable in the
36 bfd structure which contains the number of sections. However, ELF
37 supports multiple "views" of a file. In particular, with current
38 implementations, executable files typically have two tables, a
39 program header table and a section header table, both of which
40 partition the executable.
42 In ELF-speak, the "linking view" of the file uses the section header
43 table to access "sections" within the file, and the "execution view"
44 uses the program header table to access "segments" within the file.
45 "Segments" typically may contain all the data from one or more
48 Note that the section header table is optional in ELF executables,
49 but it is this information that is most useful to gdb. If the
50 section header table is missing, then gdb should probably try
51 to make do with the program header table. (FIXME)
53 (2) The code in this file is compiled twice, once in 32-bit mode and
54 once in 64-bit mode. More of it should be made size-independent
57 (3) ELF section symbols are handled rather sloppily now. This should
58 be cleaned up, and ELF section symbols reconciled with BFD section
61 (4) We need a published spec for 64-bit ELF. We've got some stuff here
62 that we're using for SPARC V9 64-bit chips, but don't assume that
66 #include <string.h> /* For strrchr and friends */
73 /* Renaming structures, typedefs, macros and functions to be size-specific. */
74 #define Elf_External_Ehdr NAME(Elf,External_Ehdr)
75 #define Elf_External_Sym NAME(Elf,External_Sym)
76 #define Elf_External_Shdr NAME(Elf,External_Shdr)
77 #define Elf_External_Phdr NAME(Elf,External_Phdr)
78 #define Elf_External_Rel NAME(Elf,External_Rel)
79 #define Elf_External_Rela NAME(Elf,External_Rela)
80 #define Elf_External_Dyn NAME(Elf,External_Dyn)
82 #define elf_core_file_failing_command NAME(bfd_elf,core_file_failing_command)
83 #define elf_core_file_failing_signal NAME(bfd_elf,core_file_failing_signal)
84 #define elf_core_file_matches_executable_p \
85 NAME(bfd_elf,core_file_matches_executable_p)
86 #define elf_object_p NAME(bfd_elf,object_p)
87 #define elf_core_file_p NAME(bfd_elf,core_file_p)
88 #define elf_get_symtab_upper_bound NAME(bfd_elf,get_symtab_upper_bound)
89 #define elf_get_dynamic_symtab_upper_bound \
90 NAME(bfd_elf,get_dynamic_symtab_upper_bound)
91 #define elf_swap_reloc_in NAME(bfd_elf,swap_reloc_in)
92 #define elf_swap_reloca_in NAME(bfd_elf,swap_reloca_in)
93 #define elf_swap_reloc_out NAME(bfd_elf,swap_reloc_out)
94 #define elf_swap_reloca_out NAME(bfd_elf,swap_reloca_out)
95 #define elf_swap_symbol_in NAME(bfd_elf,swap_symbol_in)
96 #define elf_swap_symbol_out NAME(bfd_elf,swap_symbol_out)
97 #define elf_swap_phdr_in NAME(bfd_elf,swap_phdr_in)
98 #define elf_swap_phdr_out NAME(bfd_elf,swap_phdr_out)
99 #define elf_swap_dyn_in NAME(bfd_elf,swap_dyn_in)
100 #define elf_swap_dyn_out NAME(bfd_elf,swap_dyn_out)
101 #define elf_get_reloc_upper_bound NAME(bfd_elf,get_reloc_upper_bound)
102 #define elf_canonicalize_reloc NAME(bfd_elf,canonicalize_reloc)
103 #define elf_get_symtab NAME(bfd_elf,get_symtab)
104 #define elf_canonicalize_dynamic_symtab \
105 NAME(bfd_elf,canonicalize_dynamic_symtab)
106 #define elf_make_empty_symbol NAME(bfd_elf,make_empty_symbol)
107 #define elf_get_symbol_info NAME(bfd_elf,get_symbol_info)
108 #define elf_get_lineno NAME(bfd_elf,get_lineno)
109 #define elf_set_arch_mach NAME(bfd_elf,set_arch_mach)
110 #define elf_find_nearest_line NAME(bfd_elf,find_nearest_line)
111 #define elf_sizeof_headers NAME(bfd_elf,sizeof_headers)
112 #define elf_set_section_contents NAME(bfd_elf,set_section_contents)
113 #define elf_no_info_to_howto NAME(bfd_elf,no_info_to_howto)
114 #define elf_no_info_to_howto_rel NAME(bfd_elf,no_info_to_howto_rel)
115 #define elf_find_section NAME(bfd_elf,find_section)
116 #define elf_bfd_link_add_symbols NAME(bfd_elf,bfd_link_add_symbols)
117 #define elf_add_dynamic_entry NAME(bfd_elf,add_dynamic_entry)
118 #define elf_link_create_dynamic_sections \
119 NAME(bfd_elf,link_create_dynamic_sections)
120 #define elf_link_record_dynamic_symbol _bfd_elf_link_record_dynamic_symbol
121 #define elf_bfd_final_link NAME(bfd_elf,bfd_final_link)
124 #define ELF_R_INFO(X,Y) ELF64_R_INFO(X,Y)
125 #define ELF_R_SYM(X) ELF64_R_SYM(X)
126 #define ELF_R_TYPE(X) ELF64_R_TYPE(X)
127 #define ELFCLASS ELFCLASS64
129 #define LOG_FILE_ALIGN 3
132 #define ELF_R_INFO(X,Y) ELF32_R_INFO(X,Y)
133 #define ELF_R_SYM(X) ELF32_R_SYM(X)
134 #define ELF_R_TYPE(X) ELF32_R_TYPE(X)
135 #define ELFCLASS ELFCLASS32
137 #define LOG_FILE_ALIGN 2
140 /* Forward declarations of static functions */
142 #define elf_stringtab_init _bfd_elf_stringtab_init
144 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init PARAMS ((void));
145 #define section_from_elf_index bfd_section_from_elf_index
146 extern boolean bfd_section_from_phdr PARAMS ((bfd *, Elf_Internal_Phdr *,
149 int _bfd_elf_section_from_bfd_section PARAMS ((bfd *, struct sec *));
151 static long elf_slurp_symbol_table PARAMS ((bfd *, asymbol **, boolean));
153 static boolean elf_slurp_reloc_table PARAMS ((bfd *, asection *, asymbol **));
155 int _bfd_elf_symbol_from_bfd_symbol PARAMS ((bfd *,
156 struct symbol_cache_entry **));
158 static void write_relocs PARAMS ((bfd *, asection *, PTR));
160 boolean bfd_section_from_shdr PARAMS ((bfd *, unsigned int shindex));
163 static void elf_debug_section PARAMS ((int, Elf_Internal_Shdr *));
164 static void elf_debug_file PARAMS ((Elf_Internal_Ehdr *));
165 static char *elf_symbol_flags PARAMS ((flagword));
168 /* Structure swapping routines */
170 /* Should perhaps use put_offset, put_word, etc. For now, the two versions
171 can be handled by explicitly specifying 32 bits or "the long type". */
173 #define put_word bfd_h_put_64
174 #define get_word bfd_h_get_64
177 #define put_word bfd_h_put_32
178 #define get_word bfd_h_get_32
181 /* Translate an ELF symbol in external format into an ELF symbol in internal
185 elf_swap_symbol_in (abfd, src, dst)
187 Elf_External_Sym *src;
188 Elf_Internal_Sym *dst;
190 dst->st_name = bfd_h_get_32 (abfd, (bfd_byte *) src->st_name);
191 dst->st_value = get_word (abfd, (bfd_byte *) src->st_value);
192 dst->st_size = get_word (abfd, (bfd_byte *) src->st_size);
193 dst->st_info = bfd_h_get_8 (abfd, (bfd_byte *) src->st_info);
194 dst->st_other = bfd_h_get_8 (abfd, (bfd_byte *) src->st_other);
195 dst->st_shndx = bfd_h_get_16 (abfd, (bfd_byte *) src->st_shndx);
198 /* Translate an ELF symbol in internal format into an ELF symbol in external
202 elf_swap_symbol_out (abfd, src, cdst)
204 Elf_Internal_Sym *src;
207 Elf_External_Sym *dst = (Elf_External_Sym *) cdst;
208 bfd_h_put_32 (abfd, src->st_name, dst->st_name);
209 put_word (abfd, src->st_value, dst->st_value);
210 put_word (abfd, src->st_size, dst->st_size);
211 bfd_h_put_8 (abfd, src->st_info, dst->st_info);
212 bfd_h_put_8 (abfd, src->st_other, dst->st_other);
213 bfd_h_put_16 (abfd, src->st_shndx, dst->st_shndx);
217 /* Translate an ELF file header in external format into an ELF file header in
221 elf_swap_ehdr_in (abfd, src, dst)
223 Elf_External_Ehdr *src;
224 Elf_Internal_Ehdr *dst;
226 memcpy (dst->e_ident, src->e_ident, EI_NIDENT);
227 dst->e_type = bfd_h_get_16 (abfd, (bfd_byte *) src->e_type);
228 dst->e_machine = bfd_h_get_16 (abfd, (bfd_byte *) src->e_machine);
229 dst->e_version = bfd_h_get_32 (abfd, (bfd_byte *) src->e_version);
230 dst->e_entry = get_word (abfd, (bfd_byte *) src->e_entry);
231 dst->e_phoff = get_word (abfd, (bfd_byte *) src->e_phoff);
232 dst->e_shoff = get_word (abfd, (bfd_byte *) src->e_shoff);
233 dst->e_flags = bfd_h_get_32 (abfd, (bfd_byte *) src->e_flags);
234 dst->e_ehsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_ehsize);
235 dst->e_phentsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_phentsize);
236 dst->e_phnum = bfd_h_get_16 (abfd, (bfd_byte *) src->e_phnum);
237 dst->e_shentsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shentsize);
238 dst->e_shnum = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shnum);
239 dst->e_shstrndx = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shstrndx);
242 /* Translate an ELF file header in internal format into an ELF file header in
246 elf_swap_ehdr_out (abfd, src, dst)
248 Elf_Internal_Ehdr *src;
249 Elf_External_Ehdr *dst;
251 memcpy (dst->e_ident, src->e_ident, EI_NIDENT);
252 /* note that all elements of dst are *arrays of unsigned char* already... */
253 bfd_h_put_16 (abfd, src->e_type, dst->e_type);
254 bfd_h_put_16 (abfd, src->e_machine, dst->e_machine);
255 bfd_h_put_32 (abfd, src->e_version, dst->e_version);
256 put_word (abfd, src->e_entry, dst->e_entry);
257 put_word (abfd, src->e_phoff, dst->e_phoff);
258 put_word (abfd, src->e_shoff, dst->e_shoff);
259 bfd_h_put_32 (abfd, src->e_flags, dst->e_flags);
260 bfd_h_put_16 (abfd, src->e_ehsize, dst->e_ehsize);
261 bfd_h_put_16 (abfd, src->e_phentsize, dst->e_phentsize);
262 bfd_h_put_16 (abfd, src->e_phnum, dst->e_phnum);
263 bfd_h_put_16 (abfd, src->e_shentsize, dst->e_shentsize);
264 bfd_h_put_16 (abfd, src->e_shnum, dst->e_shnum);
265 bfd_h_put_16 (abfd, src->e_shstrndx, dst->e_shstrndx);
269 /* Translate an ELF section header table entry in external format into an
270 ELF section header table entry in internal format. */
273 elf_swap_shdr_in (abfd, src, dst)
275 Elf_External_Shdr *src;
276 Elf_Internal_Shdr *dst;
278 dst->sh_name = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_name);
279 dst->sh_type = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_type);
280 dst->sh_flags = get_word (abfd, (bfd_byte *) src->sh_flags);
281 dst->sh_addr = get_word (abfd, (bfd_byte *) src->sh_addr);
282 dst->sh_offset = get_word (abfd, (bfd_byte *) src->sh_offset);
283 dst->sh_size = get_word (abfd, (bfd_byte *) src->sh_size);
284 dst->sh_link = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_link);
285 dst->sh_info = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_info);
286 dst->sh_addralign = get_word (abfd, (bfd_byte *) src->sh_addralign);
287 dst->sh_entsize = get_word (abfd, (bfd_byte *) src->sh_entsize);
288 dst->bfd_section = NULL;
289 dst->contents = NULL;
292 /* Translate an ELF section header table entry in internal format into an
293 ELF section header table entry in external format. */
296 elf_swap_shdr_out (abfd, src, dst)
298 Elf_Internal_Shdr *src;
299 Elf_External_Shdr *dst;
301 /* note that all elements of dst are *arrays of unsigned char* already... */
302 bfd_h_put_32 (abfd, src->sh_name, dst->sh_name);
303 bfd_h_put_32 (abfd, src->sh_type, dst->sh_type);
304 put_word (abfd, src->sh_flags, dst->sh_flags);
305 put_word (abfd, src->sh_addr, dst->sh_addr);
306 put_word (abfd, src->sh_offset, dst->sh_offset);
307 put_word (abfd, src->sh_size, dst->sh_size);
308 bfd_h_put_32 (abfd, src->sh_link, dst->sh_link);
309 bfd_h_put_32 (abfd, src->sh_info, dst->sh_info);
310 put_word (abfd, src->sh_addralign, dst->sh_addralign);
311 put_word (abfd, src->sh_entsize, dst->sh_entsize);
315 /* Translate an ELF program header table entry in external format into an
316 ELF program header table entry in internal format. */
319 elf_swap_phdr_in (abfd, src, dst)
321 Elf_External_Phdr *src;
322 Elf_Internal_Phdr *dst;
324 dst->p_type = bfd_h_get_32 (abfd, (bfd_byte *) src->p_type);
325 dst->p_flags = bfd_h_get_32 (abfd, (bfd_byte *) src->p_flags);
326 dst->p_offset = get_word (abfd, (bfd_byte *) src->p_offset);
327 dst->p_vaddr = get_word (abfd, (bfd_byte *) src->p_vaddr);
328 dst->p_paddr = get_word (abfd, (bfd_byte *) src->p_paddr);
329 dst->p_filesz = get_word (abfd, (bfd_byte *) src->p_filesz);
330 dst->p_memsz = get_word (abfd, (bfd_byte *) src->p_memsz);
331 dst->p_align = get_word (abfd, (bfd_byte *) src->p_align);
335 elf_swap_phdr_out (abfd, src, dst)
337 Elf_Internal_Phdr *src;
338 Elf_External_Phdr *dst;
340 /* note that all elements of dst are *arrays of unsigned char* already... */
341 bfd_h_put_32 (abfd, src->p_type, dst->p_type);
342 put_word (abfd, src->p_offset, dst->p_offset);
343 put_word (abfd, src->p_vaddr, dst->p_vaddr);
344 put_word (abfd, src->p_paddr, dst->p_paddr);
345 put_word (abfd, src->p_filesz, dst->p_filesz);
346 put_word (abfd, src->p_memsz, dst->p_memsz);
347 bfd_h_put_32 (abfd, src->p_flags, dst->p_flags);
348 put_word (abfd, src->p_align, dst->p_align);
351 /* Translate an ELF reloc from external format to internal format. */
353 elf_swap_reloc_in (abfd, src, dst)
355 Elf_External_Rel *src;
356 Elf_Internal_Rel *dst;
358 dst->r_offset = get_word (abfd, (bfd_byte *) src->r_offset);
359 dst->r_info = get_word (abfd, (bfd_byte *) src->r_info);
363 elf_swap_reloca_in (abfd, src, dst)
365 Elf_External_Rela *src;
366 Elf_Internal_Rela *dst;
368 dst->r_offset = get_word (abfd, (bfd_byte *) src->r_offset);
369 dst->r_info = get_word (abfd, (bfd_byte *) src->r_info);
370 dst->r_addend = get_word (abfd, (bfd_byte *) src->r_addend);
373 /* Translate an ELF reloc from internal format to external format. */
375 elf_swap_reloc_out (abfd, src, dst)
377 Elf_Internal_Rel *src;
378 Elf_External_Rel *dst;
380 put_word (abfd, src->r_offset, dst->r_offset);
381 put_word (abfd, src->r_info, dst->r_info);
385 elf_swap_reloca_out (abfd, src, dst)
387 Elf_Internal_Rela *src;
388 Elf_External_Rela *dst;
390 put_word (abfd, src->r_offset, dst->r_offset);
391 put_word (abfd, src->r_info, dst->r_info);
392 put_word (abfd, src->r_addend, dst->r_addend);
396 elf_swap_dyn_in (abfd, p, dst)
399 Elf_Internal_Dyn *dst;
401 const Elf_External_Dyn *src = (const Elf_External_Dyn *) p;
403 dst->d_tag = get_word (abfd, src->d_tag);
404 dst->d_un.d_val = get_word (abfd, src->d_un.d_val);
408 elf_swap_dyn_out (abfd, src, dst)
410 const Elf_Internal_Dyn *src;
411 Elf_External_Dyn *dst;
413 put_word (abfd, src->d_tag, dst->d_tag);
414 put_word (abfd, src->d_un.d_val, dst->d_un.d_val);
417 /* ELF .o/exec file reading */
420 /* Begin processing a given object.
422 First we validate the file by reading in the ELF header and checking
425 static INLINE boolean
427 Elf_External_Ehdr *x_ehdrp;
429 return ((x_ehdrp->e_ident[EI_MAG0] == ELFMAG0)
430 && (x_ehdrp->e_ident[EI_MAG1] == ELFMAG1)
431 && (x_ehdrp->e_ident[EI_MAG2] == ELFMAG2)
432 && (x_ehdrp->e_ident[EI_MAG3] == ELFMAG3));
435 /* Check to see if the file associated with ABFD matches the target vector
438 Note that we may be called several times with the same ABFD, but different
439 target vectors, most of which will not match. We have to avoid leaving
440 any side effects in ABFD, or any data it points to (like tdata), if the
441 file does not match the target vector. */
447 Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
448 Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
449 Elf_External_Shdr x_shdr; /* Section header table entry, external form */
450 Elf_Internal_Shdr *i_shdrp = NULL; /* Section header table, internal form */
451 unsigned int shindex;
452 char *shstrtab; /* Internal copy of section header stringtab */
453 struct elf_backend_data *ebd;
454 struct elf_obj_tdata *preserved_tdata = elf_tdata (abfd);
455 struct elf_obj_tdata *new_tdata = NULL;
457 /* Read in the ELF header in external format. */
459 if (bfd_read ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd) != sizeof (x_ehdr))
461 if (bfd_get_error () != bfd_error_system_call)
462 goto got_wrong_format_error;
467 /* Now check to see if we have a valid ELF file, and one that BFD can
468 make use of. The magic number must match, the address size ('class')
469 and byte-swapping must match our XVEC entry, and it must have a
470 section header table (FIXME: See comments re sections at top of this
473 if ((elf_file_p (&x_ehdr) == false) ||
474 (x_ehdr.e_ident[EI_VERSION] != EV_CURRENT) ||
475 (x_ehdr.e_ident[EI_CLASS] != ELFCLASS))
476 goto got_wrong_format_error;
478 /* Check that file's byte order matches xvec's */
479 switch (x_ehdr.e_ident[EI_DATA])
481 case ELFDATA2MSB: /* Big-endian */
482 if (! bfd_header_big_endian (abfd))
483 goto got_wrong_format_error;
485 case ELFDATA2LSB: /* Little-endian */
486 if (! bfd_header_little_endian (abfd))
487 goto got_wrong_format_error;
489 case ELFDATANONE: /* No data encoding specified */
490 default: /* Unknown data encoding specified */
491 goto got_wrong_format_error;
494 /* Allocate an instance of the elf_obj_tdata structure and hook it up to
495 the tdata pointer in the bfd. */
497 new_tdata = ((struct elf_obj_tdata *)
498 bfd_zalloc (abfd, sizeof (struct elf_obj_tdata)));
499 if (new_tdata == NULL)
501 elf_tdata (abfd) = new_tdata;
503 /* Now that we know the byte order, swap in the rest of the header */
504 i_ehdrp = elf_elfheader (abfd);
505 elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp);
507 elf_debug_file (i_ehdrp);
510 /* If there is no section header table, we're hosed. */
511 if (i_ehdrp->e_shoff == 0)
512 goto got_wrong_format_error;
514 /* As a simple sanity check, verify that the what BFD thinks is the
515 size of each section header table entry actually matches the size
516 recorded in the file. */
517 if (i_ehdrp->e_shentsize != sizeof (x_shdr))
518 goto got_wrong_format_error;
520 ebd = get_elf_backend_data (abfd);
522 /* Check that the ELF e_machine field matches what this particular
523 BFD format expects. */
524 if (ebd->elf_machine_code != i_ehdrp->e_machine
525 && (ebd->elf_machine_alt1 == 0 || i_ehdrp->e_machine != ebd->elf_machine_alt1)
526 && (ebd->elf_machine_alt2 == 0 || i_ehdrp->e_machine != ebd->elf_machine_alt2))
528 const bfd_target * const *target_ptr;
530 if (ebd->elf_machine_code != EM_NONE)
531 goto got_wrong_format_error;
533 /* This is the generic ELF target. Let it match any ELF target
534 for which we do not have a specific backend. */
535 for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++)
537 struct elf_backend_data *back;
539 if ((*target_ptr)->flavour != bfd_target_elf_flavour)
541 back = (struct elf_backend_data *) (*target_ptr)->backend_data;
542 if (back->elf_machine_code == i_ehdrp->e_machine)
544 /* target_ptr is an ELF backend which matches this
545 object file, so reject the generic ELF target. */
546 goto got_wrong_format_error;
551 if (i_ehdrp->e_type == ET_EXEC)
552 abfd->flags |= EXEC_P;
553 else if (i_ehdrp->e_type == ET_DYN)
554 abfd->flags |= DYNAMIC;
556 if (i_ehdrp->e_phnum > 0)
557 abfd->flags |= D_PAGED;
559 if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0))
562 /* Remember the entry point specified in the ELF file header. */
563 bfd_get_start_address (abfd) = i_ehdrp->e_entry;
565 /* Allocate space for a copy of the section header table in
566 internal form, seek to the section header table in the file,
567 read it in, and convert it to internal form. */
568 i_shdrp = ((Elf_Internal_Shdr *)
569 bfd_alloc (abfd, sizeof (*i_shdrp) * i_ehdrp->e_shnum));
570 elf_elfsections (abfd) = ((Elf_Internal_Shdr **)
572 sizeof (i_shdrp) * i_ehdrp->e_shnum));
573 if (!i_shdrp || !elf_elfsections (abfd))
575 if (bfd_seek (abfd, i_ehdrp->e_shoff, SEEK_SET) != 0)
577 for (shindex = 0; shindex < i_ehdrp->e_shnum; shindex++)
579 if (bfd_read ((PTR) & x_shdr, sizeof x_shdr, 1, abfd) != sizeof (x_shdr))
581 elf_swap_shdr_in (abfd, &x_shdr, i_shdrp + shindex);
582 elf_elfsections (abfd)[shindex] = i_shdrp + shindex;
584 if (i_ehdrp->e_shstrndx)
586 if (! bfd_section_from_shdr (abfd, i_ehdrp->e_shstrndx))
590 /* Read in the program headers. */
591 if (i_ehdrp->e_phnum == 0)
592 elf_tdata (abfd)->phdr = NULL;
595 Elf_Internal_Phdr *i_phdr;
598 elf_tdata (abfd)->phdr = ((Elf_Internal_Phdr *)
601 * sizeof (Elf_Internal_Phdr))));
602 if (elf_tdata (abfd)->phdr == NULL)
604 if (bfd_seek (abfd, i_ehdrp->e_phoff, SEEK_SET) != 0)
606 i_phdr = elf_tdata (abfd)->phdr;
607 for (i = 0; i < i_ehdrp->e_phnum; i++, i_phdr++)
609 Elf_External_Phdr x_phdr;
611 if (bfd_read ((PTR) &x_phdr, sizeof x_phdr, 1, abfd)
614 elf_swap_phdr_in (abfd, &x_phdr, i_phdr);
618 /* Read in the string table containing the names of the sections. We
619 will need the base pointer to this table later. */
620 /* We read this inline now, so that we don't have to go through
621 bfd_section_from_shdr with it (since this particular strtab is
622 used to find all of the ELF section names.) */
624 shstrtab = bfd_elf_get_str_section (abfd, i_ehdrp->e_shstrndx);
628 /* Once all of the section headers have been read and converted, we
629 can start processing them. Note that the first section header is
630 a dummy placeholder entry, so we ignore it. */
632 for (shindex = 1; shindex < i_ehdrp->e_shnum; shindex++)
634 if (! bfd_section_from_shdr (abfd, shindex))
638 /* Let the backend double check the format and override global
640 if (ebd->elf_backend_object_p)
642 if ((*ebd->elf_backend_object_p) (abfd) == false)
643 goto got_wrong_format_error;
648 got_wrong_format_error:
649 bfd_set_error (bfd_error_wrong_format);
652 if (new_tdata != NULL
653 && new_tdata->elf_sect_ptr != NULL)
654 bfd_release (abfd, new_tdata->elf_sect_ptr);
656 bfd_release (abfd, i_shdrp);
657 if (new_tdata != NULL)
658 bfd_release (abfd, new_tdata);
659 elf_tdata (abfd) = preserved_tdata;
664 /* ELF .o/exec file writing */
667 write_relocs (abfd, sec, data)
672 boolean *failedp = (boolean *) data;
673 Elf_Internal_Shdr *rela_hdr;
674 Elf_External_Rela *outbound_relocas;
675 Elf_External_Rel *outbound_relocs;
677 int use_rela_p = get_elf_backend_data (abfd)->use_rela_p;
678 asymbol *last_sym = 0;
679 int last_sym_idx = 9999999; /* should always be written before use */
681 /* If we have already failed, don't do anything. */
685 if ((sec->flags & SEC_RELOC) == 0)
688 /* The linker backend writes the relocs out itself, and sets the
689 reloc_count field to zero to inhibit writing them here. Also,
690 sometimes the SEC_RELOC flag gets set even when there aren't any
692 if (sec->reloc_count == 0)
695 rela_hdr = &elf_section_data (sec)->rel_hdr;
697 rela_hdr->sh_size = rela_hdr->sh_entsize * sec->reloc_count;
698 rela_hdr->contents = (PTR) bfd_alloc (abfd, rela_hdr->sh_size);
699 if (rela_hdr->contents == NULL)
705 /* orelocation has the data, reloc_count has the count... */
708 outbound_relocas = (Elf_External_Rela *) rela_hdr->contents;
710 for (idx = 0; idx < sec->reloc_count; idx++)
712 Elf_Internal_Rela dst_rela;
713 Elf_External_Rela *src_rela;
718 ptr = sec->orelocation[idx];
719 src_rela = outbound_relocas + idx;
721 /* The address of an ELF reloc is section relative for an object
722 file, and absolute for an executable file or shared library.
723 The address of a BFD reloc is always section relative. */
724 if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0)
725 dst_rela.r_offset = ptr->address;
727 dst_rela.r_offset = ptr->address + sec->vma;
729 sym = *ptr->sym_ptr_ptr;
735 last_sym_idx = n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym);
737 dst_rela.r_info = ELF_R_INFO (n, ptr->howto->type);
739 dst_rela.r_addend = ptr->addend;
740 elf_swap_reloca_out (abfd, &dst_rela, src_rela);
744 /* REL relocations */
746 outbound_relocs = (Elf_External_Rel *) rela_hdr->contents;
748 for (idx = 0; idx < sec->reloc_count; idx++)
750 Elf_Internal_Rel dst_rel;
751 Elf_External_Rel *src_rel;
756 ptr = sec->orelocation[idx];
757 sym = *ptr->sym_ptr_ptr;
758 src_rel = outbound_relocs + idx;
760 /* The address of an ELF reloc is section relative for an object
761 file, and absolute for an executable file or shared library.
762 The address of a BFD reloc is always section relative. */
763 if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0)
764 dst_rel.r_offset = ptr->address;
766 dst_rel.r_offset = ptr->address + sec->vma;
773 last_sym_idx = n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym);
775 dst_rel.r_info = ELF_R_INFO (n, ptr->howto->type);
777 elf_swap_reloc_out (abfd, &dst_rel, src_rel);
783 write_out_phdrs (abfd, phdr, count)
785 Elf_Internal_Phdr *phdr;
790 Elf_External_Phdr extphdr;
791 elf_swap_phdr_out (abfd, phdr, &extphdr);
792 if (bfd_write (&extphdr, sizeof (Elf_External_Phdr), 1, abfd)
793 != sizeof (Elf_External_Phdr))
801 write_shdrs_and_ehdr (abfd)
804 Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
805 Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
806 Elf_External_Shdr *x_shdrp; /* Section header table, external form */
807 Elf_Internal_Shdr **i_shdrp; /* Section header table, internal form */
810 i_ehdrp = elf_elfheader (abfd);
811 i_shdrp = elf_elfsections (abfd);
813 /* swap the header before spitting it out... */
816 elf_debug_file (i_ehdrp);
818 elf_swap_ehdr_out (abfd, i_ehdrp, &x_ehdr);
819 if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
820 || (bfd_write ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd)
824 /* at this point we've concocted all the ELF sections... */
825 x_shdrp = (Elf_External_Shdr *)
826 bfd_alloc (abfd, sizeof (*x_shdrp) * (i_ehdrp->e_shnum));
830 for (count = 0; count < i_ehdrp->e_shnum; count++)
833 elf_debug_section (count, i_shdrp[count]);
835 elf_swap_shdr_out (abfd, i_shdrp[count], x_shdrp + count);
837 if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_shoff, SEEK_SET) != 0
838 || (bfd_write ((PTR) x_shdrp, sizeof (*x_shdrp), i_ehdrp->e_shnum, abfd)
839 != sizeof (*x_shdrp) * i_ehdrp->e_shnum))
842 /* need to dump the string table too... */
848 elf_slurp_symbol_table (abfd, symptrs, dynamic)
850 asymbol **symptrs; /* Buffer for generated bfd symbols */
853 Elf_Internal_Shdr *hdr;
854 long symcount; /* Number of external ELF symbols */
855 elf_symbol_type *sym; /* Pointer to current bfd symbol */
856 elf_symbol_type *symbase; /* Buffer for generated bfd symbols */
857 Elf_Internal_Sym i_sym;
858 Elf_External_Sym *x_symp = NULL;
860 /* Read each raw ELF symbol, converting from external ELF form to
861 internal ELF form, and then using the information to create a
862 canonical bfd symbol table entry.
864 Note that we allocate the initial bfd canonical symbol buffer
865 based on a one-to-one mapping of the ELF symbols to canonical
866 symbols. We actually use all the ELF symbols, so there will be no
867 space left over at the end. When we have all the symbols, we
868 build the caller's pointer vector. */
871 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
873 hdr = &elf_tdata (abfd)->symtab_hdr;
874 if (bfd_seek (abfd, hdr->sh_offset, SEEK_SET) == -1)
877 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
880 sym = symbase = NULL;
885 if (bfd_seek (abfd, hdr->sh_offset, SEEK_SET) == -1)
888 symbase = ((elf_symbol_type *)
889 bfd_zalloc (abfd, symcount * sizeof (elf_symbol_type)));
890 if (symbase == (elf_symbol_type *) NULL)
894 /* Temporarily allocate room for the raw ELF symbols. */
895 x_symp = ((Elf_External_Sym *)
896 bfd_malloc (symcount * sizeof (Elf_External_Sym)));
897 if (x_symp == NULL && symcount != 0)
900 if (bfd_read ((PTR) x_symp, sizeof (Elf_External_Sym), symcount, abfd)
901 != symcount * sizeof (Elf_External_Sym))
903 /* Skip first symbol, which is a null dummy. */
904 for (i = 1; i < symcount; i++)
906 elf_swap_symbol_in (abfd, x_symp + i, &i_sym);
907 memcpy (&sym->internal_elf_sym, &i_sym, sizeof (Elf_Internal_Sym));
908 #ifdef ELF_KEEP_EXTSYM
909 memcpy (&sym->native_elf_sym, x_symp + i, sizeof (Elf_External_Sym));
911 sym->symbol.the_bfd = abfd;
913 sym->symbol.name = bfd_elf_string_from_elf_section (abfd,
917 sym->symbol.value = i_sym.st_value;
919 if (i_sym.st_shndx > 0 && i_sym.st_shndx < SHN_LORESERVE)
921 sym->symbol.section = section_from_elf_index (abfd,
923 if (sym->symbol.section == NULL)
925 /* This symbol is in a section for which we did not
926 create a BFD section. Just use bfd_abs_section,
927 although it is wrong. FIXME. */
928 sym->symbol.section = bfd_abs_section_ptr;
931 else if (i_sym.st_shndx == SHN_ABS)
933 sym->symbol.section = bfd_abs_section_ptr;
935 else if (i_sym.st_shndx == SHN_COMMON)
937 sym->symbol.section = bfd_com_section_ptr;
938 /* Elf puts the alignment into the `value' field, and
939 the size into the `size' field. BFD wants to see the
940 size in the value field, and doesn't care (at the
941 moment) about the alignment. */
942 sym->symbol.value = i_sym.st_size;
944 else if (i_sym.st_shndx == SHN_UNDEF)
946 sym->symbol.section = bfd_und_section_ptr;
949 sym->symbol.section = bfd_abs_section_ptr;
951 sym->symbol.value -= sym->symbol.section->vma;
953 switch (ELF_ST_BIND (i_sym.st_info))
956 sym->symbol.flags |= BSF_LOCAL;
959 if (i_sym.st_shndx != SHN_UNDEF
960 && i_sym.st_shndx != SHN_COMMON)
961 sym->symbol.flags |= BSF_GLOBAL;
964 sym->symbol.flags |= BSF_WEAK;
968 switch (ELF_ST_TYPE (i_sym.st_info))
971 sym->symbol.flags |= BSF_SECTION_SYM | BSF_DEBUGGING;
974 sym->symbol.flags |= BSF_FILE | BSF_DEBUGGING;
977 sym->symbol.flags |= BSF_FUNCTION;
982 sym->symbol.flags |= BSF_DYNAMIC;
984 /* Do some backend-specific processing on this symbol. */
986 struct elf_backend_data *ebd = get_elf_backend_data (abfd);
987 if (ebd->elf_backend_symbol_processing)
988 (*ebd->elf_backend_symbol_processing) (abfd, &sym->symbol);
995 /* Do some backend-specific processing on this symbol table. */
997 struct elf_backend_data *ebd = get_elf_backend_data (abfd);
998 if (ebd->elf_backend_symbol_table_processing)
999 (*ebd->elf_backend_symbol_table_processing) (abfd, symbase, symcount);
1002 /* We rely on the zalloc to clear out the final symbol entry. */
1004 symcount = sym - symbase;
1006 /* Fill in the user's symbol pointer vector if needed. */
1014 *symptrs++ = &sym->symbol;
1017 *symptrs = 0; /* Final null pointer */
1029 /* Read in and swap the external relocs. */
1032 elf_slurp_reloc_table (abfd, asect, symbols)
1037 struct elf_backend_data * const ebd = get_elf_backend_data (abfd);
1038 struct bfd_elf_section_data * const d = elf_section_data (asect);
1039 PTR allocated = NULL;
1040 bfd_byte *native_relocs;
1046 if (asect->relocation != NULL
1047 || (asect->flags & SEC_RELOC) == 0
1048 || asect->reloc_count == 0)
1051 BFD_ASSERT (asect->rel_filepos == d->rel_hdr.sh_offset
1052 && (asect->reloc_count
1053 == d->rel_hdr.sh_size / d->rel_hdr.sh_entsize));
1055 allocated = (PTR) bfd_malloc ((size_t) d->rel_hdr.sh_size);
1056 if (allocated == NULL)
1059 if (bfd_seek (abfd, asect->rel_filepos, SEEK_SET) != 0
1060 || (bfd_read (allocated, 1, d->rel_hdr.sh_size, abfd)
1061 != d->rel_hdr.sh_size))
1064 native_relocs = (bfd_byte *) allocated;
1066 relents = ((arelent *)
1067 bfd_alloc (abfd, asect->reloc_count * sizeof (arelent)));
1068 if (relents == NULL)
1071 entsize = d->rel_hdr.sh_entsize;
1072 BFD_ASSERT (entsize == sizeof (Elf_External_Rel)
1073 || entsize == sizeof (Elf_External_Rela));
1075 for (i = 0, relent = relents;
1076 i < asect->reloc_count;
1077 i++, relent++, native_relocs += entsize)
1079 Elf_Internal_Rela rela;
1080 Elf_Internal_Rel rel;
1082 if (entsize == sizeof (Elf_External_Rela))
1083 elf_swap_reloca_in (abfd, (Elf_External_Rela *) native_relocs, &rela);
1086 elf_swap_reloc_in (abfd, (Elf_External_Rel *) native_relocs, &rel);
1087 rela.r_offset = rel.r_offset;
1088 rela.r_info = rel.r_info;
1092 /* The address of an ELF reloc is section relative for an object
1093 file, and absolute for an executable file or shared library.
1094 The address of a BFD reloc is always section relative. */
1095 if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0)
1096 relent->address = rela.r_offset;
1098 relent->address = rela.r_offset - asect->vma;
1100 if (ELF_R_SYM (rela.r_info) == 0)
1101 relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
1106 ps = symbols + ELF_R_SYM (rela.r_info) - 1;
1109 /* Canonicalize ELF section symbols. FIXME: Why? */
1110 if ((s->flags & BSF_SECTION_SYM) == 0)
1111 relent->sym_ptr_ptr = ps;
1113 relent->sym_ptr_ptr = s->section->symbol_ptr_ptr;
1116 relent->addend = rela.r_addend;
1118 if (entsize == sizeof (Elf_External_Rela))
1119 (*ebd->elf_info_to_howto) (abfd, relent, &rela);
1121 (*ebd->elf_info_to_howto_rel) (abfd, relent, &rel);
1124 asect->relocation = relents;
1126 if (allocated != NULL)
1132 if (allocated != NULL)
1139 elf_debug_section (num, hdr)
1141 Elf_Internal_Shdr *hdr;
1143 fprintf (stderr, "\nSection#%d '%s' 0x%.8lx\n", num,
1144 hdr->bfd_section != NULL ? hdr->bfd_section->name : "",
1147 "sh_name = %ld\tsh_type = %ld\tsh_flags = %ld\n",
1148 (long) hdr->sh_name,
1149 (long) hdr->sh_type,
1150 (long) hdr->sh_flags);
1152 "sh_addr = %ld\tsh_offset = %ld\tsh_size = %ld\n",
1153 (long) hdr->sh_addr,
1154 (long) hdr->sh_offset,
1155 (long) hdr->sh_size);
1157 "sh_link = %ld\tsh_info = %ld\tsh_addralign = %ld\n",
1158 (long) hdr->sh_link,
1159 (long) hdr->sh_info,
1160 (long) hdr->sh_addralign);
1161 fprintf (stderr, "sh_entsize = %ld\n",
1162 (long) hdr->sh_entsize);
1167 elf_debug_file (ehdrp)
1168 Elf_Internal_Ehdr *ehdrp;
1170 fprintf (stderr, "e_entry = 0x%.8lx\n", (long) ehdrp->e_entry);
1171 fprintf (stderr, "e_phoff = %ld\n", (long) ehdrp->e_phoff);
1172 fprintf (stderr, "e_phnum = %ld\n", (long) ehdrp->e_phnum);
1173 fprintf (stderr, "e_phentsize = %ld\n", (long) ehdrp->e_phentsize);
1174 fprintf (stderr, "e_shoff = %ld\n", (long) ehdrp->e_shoff);
1175 fprintf (stderr, "e_shnum = %ld\n", (long) ehdrp->e_shnum);
1176 fprintf (stderr, "e_shentsize = %ld\n", (long) ehdrp->e_shentsize);
1180 elf_symbol_flags (flags)
1183 static char buffer[1024];
1186 if (flags & BSF_LOCAL)
1187 strcat (buffer, " local");
1189 if (flags & BSF_GLOBAL)
1190 strcat (buffer, " global");
1192 if (flags & BSF_DEBUGGING)
1193 strcat (buffer, " debug");
1195 if (flags & BSF_FUNCTION)
1196 strcat (buffer, " function");
1198 if (flags & BSF_KEEP)
1199 strcat (buffer, " keep");
1201 if (flags & BSF_KEEP_G)
1202 strcat (buffer, " keep_g");
1204 if (flags & BSF_WEAK)
1205 strcat (buffer, " weak");
1207 if (flags & BSF_SECTION_SYM)
1208 strcat (buffer, " section-sym");
1210 if (flags & BSF_OLD_COMMON)
1211 strcat (buffer, " old-common");
1213 if (flags & BSF_NOT_AT_END)
1214 strcat (buffer, " not-at-end");
1216 if (flags & BSF_CONSTRUCTOR)
1217 strcat (buffer, " constructor");
1219 if (flags & BSF_WARNING)
1220 strcat (buffer, " warning");
1222 if (flags & BSF_INDIRECT)
1223 strcat (buffer, " indirect");
1225 if (flags & BSF_FILE)
1226 strcat (buffer, " file");
1228 if (flags & DYNAMIC)
1229 strcat (buffer, " dynamic");
1231 if (flags & ~(BSF_LOCAL
1246 strcat (buffer, " unknown-bits");
1252 #include "elfcore.h"
1253 #include "elflink.h"
1255 /* Size-dependent data and functions. */
1256 const struct elf_size_info NAME(_bfd_elf,size_info) = {
1257 sizeof (Elf_External_Ehdr),
1258 sizeof (Elf_External_Phdr),
1259 sizeof (Elf_External_Shdr),
1260 sizeof (Elf_External_Rel),
1261 sizeof (Elf_External_Rela),
1262 sizeof (Elf_External_Sym),
1263 sizeof (Elf_External_Dyn),
1264 sizeof (Elf_External_Note),
1266 ARCH_SIZE, FILE_ALIGN,
1267 ELFCLASS, EV_CURRENT,
1269 write_shdrs_and_ehdr,
1271 elf_swap_symbol_out,
1272 elf_slurp_reloc_table,
1273 elf_slurp_symbol_table,