1 /* ELF executable support for BFD.
2 Copyright 1991, 1992, 1993, 1994, 1995, 1996 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
72 /* Renaming structures, typedefs, macros and functions to be size-specific. */
73 #define Elf_External_Ehdr NAME(Elf,External_Ehdr)
74 #define Elf_External_Sym NAME(Elf,External_Sym)
75 #define Elf_External_Shdr NAME(Elf,External_Shdr)
76 #define Elf_External_Phdr NAME(Elf,External_Phdr)
77 #define Elf_External_Rel NAME(Elf,External_Rel)
78 #define Elf_External_Rela NAME(Elf,External_Rela)
79 #define Elf_External_Dyn NAME(Elf,External_Dyn)
81 #define elf_core_file_failing_command NAME(bfd_elf,core_file_failing_command)
82 #define elf_core_file_failing_signal NAME(bfd_elf,core_file_failing_signal)
83 #define elf_core_file_matches_executable_p \
84 NAME(bfd_elf,core_file_matches_executable_p)
85 #define elf_object_p NAME(bfd_elf,object_p)
86 #define elf_core_file_p NAME(bfd_elf,core_file_p)
87 #define elf_get_symtab_upper_bound NAME(bfd_elf,get_symtab_upper_bound)
88 #define elf_get_dynamic_symtab_upper_bound \
89 NAME(bfd_elf,get_dynamic_symtab_upper_bound)
90 #define elf_swap_reloc_in NAME(bfd_elf,swap_reloc_in)
91 #define elf_swap_reloca_in NAME(bfd_elf,swap_reloca_in)
92 #define elf_swap_reloc_out NAME(bfd_elf,swap_reloc_out)
93 #define elf_swap_reloca_out NAME(bfd_elf,swap_reloca_out)
94 #define elf_swap_symbol_in NAME(bfd_elf,swap_symbol_in)
95 #define elf_swap_symbol_out NAME(bfd_elf,swap_symbol_out)
96 #define elf_swap_phdr_in NAME(bfd_elf,swap_phdr_in)
97 #define elf_swap_phdr_out NAME(bfd_elf,swap_phdr_out)
98 #define elf_swap_dyn_in NAME(bfd_elf,swap_dyn_in)
99 #define elf_swap_dyn_out NAME(bfd_elf,swap_dyn_out)
100 #define elf_get_reloc_upper_bound NAME(bfd_elf,get_reloc_upper_bound)
101 #define elf_canonicalize_reloc NAME(bfd_elf,canonicalize_reloc)
102 #define elf_slurp_symbol_table NAME(bfd_elf,slurp_symbol_table)
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_write_shdrs_and_ehdr NAME(bfd_elf,write_shdrs_and_ehdr)
119 #define elf_write_out_phdrs NAME(bfd_elf,write_out_phdrs)
120 #define elf_link_create_dynamic_sections \
121 NAME(bfd_elf,link_create_dynamic_sections)
122 #define elf_link_record_dynamic_symbol _bfd_elf_link_record_dynamic_symbol
123 #define elf_bfd_final_link NAME(bfd_elf,bfd_final_link)
124 #define elf_create_pointer_linker_section NAME(bfd_elf,create_pointer_linker_section)
125 #define elf_finish_pointer_linker_section NAME(bfd_elf,finish_pointer_linker_section)
128 #define ELF_R_INFO(X,Y) ELF64_R_INFO(X,Y)
129 #define ELF_R_SYM(X) ELF64_R_SYM(X)
130 #define ELF_R_TYPE(X) ELF64_R_TYPE(X)
131 #define ELFCLASS ELFCLASS64
133 #define LOG_FILE_ALIGN 3
136 #define ELF_R_INFO(X,Y) ELF32_R_INFO(X,Y)
137 #define ELF_R_SYM(X) ELF32_R_SYM(X)
138 #define ELF_R_TYPE(X) ELF32_R_TYPE(X)
139 #define ELFCLASS ELFCLASS32
141 #define LOG_FILE_ALIGN 2
144 /* Forward declarations of static functions */
146 static void elf_swap_ehdr_in
147 PARAMS ((bfd *, const Elf_External_Ehdr *, Elf_Internal_Ehdr *));
148 static void elf_swap_ehdr_out
149 PARAMS ((bfd *, const Elf_Internal_Ehdr *, Elf_External_Ehdr *));
150 static void elf_swap_shdr_in
151 PARAMS ((bfd *, const Elf_External_Shdr *, Elf_Internal_Shdr *));
152 static void elf_swap_shdr_out
153 PARAMS ((bfd *, const Elf_Internal_Shdr *, Elf_External_Shdr *));
155 #define elf_stringtab_init _bfd_elf_stringtab_init
157 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init PARAMS ((void));
158 #define section_from_elf_index bfd_section_from_elf_index
159 extern boolean bfd_section_from_phdr PARAMS ((bfd *, Elf_Internal_Phdr *,
162 static boolean elf_slurp_reloc_table PARAMS ((bfd *, asection *, asymbol **));
164 int _bfd_elf_symbol_from_bfd_symbol PARAMS ((bfd *,
165 struct symbol_cache_entry **));
167 static boolean validate_reloc PARAMS ((bfd *, arelent *));
168 static void write_relocs PARAMS ((bfd *, asection *, PTR));
170 boolean bfd_section_from_shdr PARAMS ((bfd *, unsigned int shindex));
173 static void elf_debug_section PARAMS ((int, Elf_Internal_Shdr *));
174 static void elf_debug_file PARAMS ((Elf_Internal_Ehdr *));
175 static char *elf_symbol_flags PARAMS ((flagword));
178 /* Structure swapping routines */
180 /* Should perhaps use put_offset, put_word, etc. For now, the two versions
181 can be handled by explicitly specifying 32 bits or "the long type". */
183 #define put_word bfd_h_put_64
184 #define get_word bfd_h_get_64
187 #define put_word bfd_h_put_32
188 #define get_word bfd_h_get_32
191 /* Translate an ELF symbol in external format into an ELF symbol in internal
195 elf_swap_symbol_in (abfd, src, dst)
197 const Elf_External_Sym *src;
198 Elf_Internal_Sym *dst;
200 dst->st_name = bfd_h_get_32 (abfd, (bfd_byte *) src->st_name);
201 dst->st_value = get_word (abfd, (bfd_byte *) src->st_value);
202 dst->st_size = get_word (abfd, (bfd_byte *) src->st_size);
203 dst->st_info = bfd_h_get_8 (abfd, (bfd_byte *) src->st_info);
204 dst->st_other = bfd_h_get_8 (abfd, (bfd_byte *) src->st_other);
205 dst->st_shndx = bfd_h_get_16 (abfd, (bfd_byte *) src->st_shndx);
208 /* Translate an ELF symbol in internal format into an ELF symbol in external
212 elf_swap_symbol_out (abfd, src, cdst)
214 const Elf_Internal_Sym *src;
217 Elf_External_Sym *dst = (Elf_External_Sym *) cdst;
218 bfd_h_put_32 (abfd, src->st_name, dst->st_name);
219 put_word (abfd, src->st_value, dst->st_value);
220 put_word (abfd, src->st_size, dst->st_size);
221 bfd_h_put_8 (abfd, src->st_info, dst->st_info);
222 bfd_h_put_8 (abfd, src->st_other, dst->st_other);
223 bfd_h_put_16 (abfd, src->st_shndx, dst->st_shndx);
227 /* Translate an ELF file header in external format into an ELF file header in
231 elf_swap_ehdr_in (abfd, src, dst)
233 const Elf_External_Ehdr *src;
234 Elf_Internal_Ehdr *dst;
236 memcpy (dst->e_ident, src->e_ident, EI_NIDENT);
237 dst->e_type = bfd_h_get_16 (abfd, (bfd_byte *) src->e_type);
238 dst->e_machine = bfd_h_get_16 (abfd, (bfd_byte *) src->e_machine);
239 dst->e_version = bfd_h_get_32 (abfd, (bfd_byte *) src->e_version);
240 dst->e_entry = get_word (abfd, (bfd_byte *) src->e_entry);
241 dst->e_phoff = get_word (abfd, (bfd_byte *) src->e_phoff);
242 dst->e_shoff = get_word (abfd, (bfd_byte *) src->e_shoff);
243 dst->e_flags = bfd_h_get_32 (abfd, (bfd_byte *) src->e_flags);
244 dst->e_ehsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_ehsize);
245 dst->e_phentsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_phentsize);
246 dst->e_phnum = bfd_h_get_16 (abfd, (bfd_byte *) src->e_phnum);
247 dst->e_shentsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shentsize);
248 dst->e_shnum = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shnum);
249 dst->e_shstrndx = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shstrndx);
252 /* Translate an ELF file header in internal format into an ELF file header in
256 elf_swap_ehdr_out (abfd, src, dst)
258 const Elf_Internal_Ehdr *src;
259 Elf_External_Ehdr *dst;
261 memcpy (dst->e_ident, src->e_ident, EI_NIDENT);
262 /* note that all elements of dst are *arrays of unsigned char* already... */
263 bfd_h_put_16 (abfd, src->e_type, dst->e_type);
264 bfd_h_put_16 (abfd, src->e_machine, dst->e_machine);
265 bfd_h_put_32 (abfd, src->e_version, dst->e_version);
266 put_word (abfd, src->e_entry, dst->e_entry);
267 put_word (abfd, src->e_phoff, dst->e_phoff);
268 put_word (abfd, src->e_shoff, dst->e_shoff);
269 bfd_h_put_32 (abfd, src->e_flags, dst->e_flags);
270 bfd_h_put_16 (abfd, src->e_ehsize, dst->e_ehsize);
271 bfd_h_put_16 (abfd, src->e_phentsize, dst->e_phentsize);
272 bfd_h_put_16 (abfd, src->e_phnum, dst->e_phnum);
273 bfd_h_put_16 (abfd, src->e_shentsize, dst->e_shentsize);
274 bfd_h_put_16 (abfd, src->e_shnum, dst->e_shnum);
275 bfd_h_put_16 (abfd, src->e_shstrndx, dst->e_shstrndx);
279 /* Translate an ELF section header table entry in external format into an
280 ELF section header table entry in internal format. */
283 elf_swap_shdr_in (abfd, src, dst)
285 const Elf_External_Shdr *src;
286 Elf_Internal_Shdr *dst;
288 dst->sh_name = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_name);
289 dst->sh_type = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_type);
290 dst->sh_flags = get_word (abfd, (bfd_byte *) src->sh_flags);
291 dst->sh_addr = get_word (abfd, (bfd_byte *) src->sh_addr);
292 dst->sh_offset = get_word (abfd, (bfd_byte *) src->sh_offset);
293 dst->sh_size = get_word (abfd, (bfd_byte *) src->sh_size);
294 dst->sh_link = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_link);
295 dst->sh_info = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_info);
296 dst->sh_addralign = get_word (abfd, (bfd_byte *) src->sh_addralign);
297 dst->sh_entsize = get_word (abfd, (bfd_byte *) src->sh_entsize);
298 dst->bfd_section = NULL;
299 dst->contents = NULL;
302 /* Translate an ELF section header table entry in internal format into an
303 ELF section header table entry in external format. */
306 elf_swap_shdr_out (abfd, src, dst)
308 const Elf_Internal_Shdr *src;
309 Elf_External_Shdr *dst;
311 /* note that all elements of dst are *arrays of unsigned char* already... */
312 bfd_h_put_32 (abfd, src->sh_name, dst->sh_name);
313 bfd_h_put_32 (abfd, src->sh_type, dst->sh_type);
314 put_word (abfd, src->sh_flags, dst->sh_flags);
315 put_word (abfd, src->sh_addr, dst->sh_addr);
316 put_word (abfd, src->sh_offset, dst->sh_offset);
317 put_word (abfd, src->sh_size, dst->sh_size);
318 bfd_h_put_32 (abfd, src->sh_link, dst->sh_link);
319 bfd_h_put_32 (abfd, src->sh_info, dst->sh_info);
320 put_word (abfd, src->sh_addralign, dst->sh_addralign);
321 put_word (abfd, src->sh_entsize, dst->sh_entsize);
325 /* Translate an ELF program header table entry in external format into an
326 ELF program header table entry in internal format. */
329 elf_swap_phdr_in (abfd, src, dst)
331 const Elf_External_Phdr *src;
332 Elf_Internal_Phdr *dst;
334 dst->p_type = bfd_h_get_32 (abfd, (bfd_byte *) src->p_type);
335 dst->p_flags = bfd_h_get_32 (abfd, (bfd_byte *) src->p_flags);
336 dst->p_offset = get_word (abfd, (bfd_byte *) src->p_offset);
337 dst->p_vaddr = get_word (abfd, (bfd_byte *) src->p_vaddr);
338 dst->p_paddr = get_word (abfd, (bfd_byte *) src->p_paddr);
339 dst->p_filesz = get_word (abfd, (bfd_byte *) src->p_filesz);
340 dst->p_memsz = get_word (abfd, (bfd_byte *) src->p_memsz);
341 dst->p_align = get_word (abfd, (bfd_byte *) src->p_align);
345 elf_swap_phdr_out (abfd, src, dst)
347 const Elf_Internal_Phdr *src;
348 Elf_External_Phdr *dst;
350 /* note that all elements of dst are *arrays of unsigned char* already... */
351 bfd_h_put_32 (abfd, src->p_type, dst->p_type);
352 put_word (abfd, src->p_offset, dst->p_offset);
353 put_word (abfd, src->p_vaddr, dst->p_vaddr);
354 put_word (abfd, src->p_paddr, dst->p_paddr);
355 put_word (abfd, src->p_filesz, dst->p_filesz);
356 put_word (abfd, src->p_memsz, dst->p_memsz);
357 bfd_h_put_32 (abfd, src->p_flags, dst->p_flags);
358 put_word (abfd, src->p_align, dst->p_align);
361 /* Translate an ELF reloc from external format to internal format. */
363 elf_swap_reloc_in (abfd, src, dst)
365 const Elf_External_Rel *src;
366 Elf_Internal_Rel *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);
373 elf_swap_reloca_in (abfd, src, dst)
375 const Elf_External_Rela *src;
376 Elf_Internal_Rela *dst;
378 dst->r_offset = get_word (abfd, (bfd_byte *) src->r_offset);
379 dst->r_info = get_word (abfd, (bfd_byte *) src->r_info);
380 dst->r_addend = get_word (abfd, (bfd_byte *) src->r_addend);
383 /* Translate an ELF reloc from internal format to external format. */
385 elf_swap_reloc_out (abfd, src, dst)
387 const Elf_Internal_Rel *src;
388 Elf_External_Rel *dst;
390 put_word (abfd, src->r_offset, dst->r_offset);
391 put_word (abfd, src->r_info, dst->r_info);
395 elf_swap_reloca_out (abfd, src, dst)
397 const Elf_Internal_Rela *src;
398 Elf_External_Rela *dst;
400 put_word (abfd, src->r_offset, dst->r_offset);
401 put_word (abfd, src->r_info, dst->r_info);
402 put_word (abfd, src->r_addend, dst->r_addend);
406 elf_swap_dyn_in (abfd, p, dst)
409 Elf_Internal_Dyn *dst;
411 const Elf_External_Dyn *src = (const Elf_External_Dyn *) p;
413 dst->d_tag = get_word (abfd, src->d_tag);
414 dst->d_un.d_val = get_word (abfd, src->d_un.d_val);
418 elf_swap_dyn_out (abfd, src, dst)
420 const Elf_Internal_Dyn *src;
421 Elf_External_Dyn *dst;
423 put_word (abfd, src->d_tag, dst->d_tag);
424 put_word (abfd, src->d_un.d_val, dst->d_un.d_val);
427 /* ELF .o/exec file reading */
430 /* Begin processing a given object.
432 First we validate the file by reading in the ELF header and checking
435 static INLINE boolean
437 Elf_External_Ehdr *x_ehdrp;
439 return ((x_ehdrp->e_ident[EI_MAG0] == ELFMAG0)
440 && (x_ehdrp->e_ident[EI_MAG1] == ELFMAG1)
441 && (x_ehdrp->e_ident[EI_MAG2] == ELFMAG2)
442 && (x_ehdrp->e_ident[EI_MAG3] == ELFMAG3));
445 /* Check to see if the file associated with ABFD matches the target vector
448 Note that we may be called several times with the same ABFD, but different
449 target vectors, most of which will not match. We have to avoid leaving
450 any side effects in ABFD, or any data it points to (like tdata), if the
451 file does not match the target vector. */
457 Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
458 Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
459 Elf_External_Shdr x_shdr; /* Section header table entry, external form */
460 Elf_Internal_Shdr *i_shdrp = NULL; /* Section header table, internal form */
461 unsigned int shindex;
462 char *shstrtab; /* Internal copy of section header stringtab */
463 struct elf_backend_data *ebd;
464 struct elf_obj_tdata *preserved_tdata = elf_tdata (abfd);
465 struct elf_obj_tdata *new_tdata = NULL;
467 /* Read in the ELF header in external format. */
469 if (bfd_read ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd) != sizeof (x_ehdr))
471 if (bfd_get_error () != bfd_error_system_call)
472 goto got_wrong_format_error;
477 /* Now check to see if we have a valid ELF file, and one that BFD can
478 make use of. The magic number must match, the address size ('class')
479 and byte-swapping must match our XVEC entry, and it must have a
480 section header table (FIXME: See comments re sections at top of this
483 if ((elf_file_p (&x_ehdr) == false) ||
484 (x_ehdr.e_ident[EI_VERSION] != EV_CURRENT) ||
485 (x_ehdr.e_ident[EI_CLASS] != ELFCLASS))
486 goto got_wrong_format_error;
488 /* Check that file's byte order matches xvec's */
489 switch (x_ehdr.e_ident[EI_DATA])
491 case ELFDATA2MSB: /* Big-endian */
492 if (! bfd_header_big_endian (abfd))
493 goto got_wrong_format_error;
495 case ELFDATA2LSB: /* Little-endian */
496 if (! bfd_header_little_endian (abfd))
497 goto got_wrong_format_error;
499 case ELFDATANONE: /* No data encoding specified */
500 default: /* Unknown data encoding specified */
501 goto got_wrong_format_error;
504 /* Allocate an instance of the elf_obj_tdata structure and hook it up to
505 the tdata pointer in the bfd. */
507 new_tdata = ((struct elf_obj_tdata *)
508 bfd_zalloc (abfd, sizeof (struct elf_obj_tdata)));
509 if (new_tdata == NULL)
511 elf_tdata (abfd) = new_tdata;
513 /* Now that we know the byte order, swap in the rest of the header */
514 i_ehdrp = elf_elfheader (abfd);
515 elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp);
517 elf_debug_file (i_ehdrp);
520 /* If there is no section header table, we're hosed. */
521 if (i_ehdrp->e_shoff == 0)
522 goto got_wrong_format_error;
524 /* As a simple sanity check, verify that the what BFD thinks is the
525 size of each section header table entry actually matches the size
526 recorded in the file. */
527 if (i_ehdrp->e_shentsize != sizeof (x_shdr))
528 goto got_wrong_format_error;
530 ebd = get_elf_backend_data (abfd);
532 /* Check that the ELF e_machine field matches what this particular
533 BFD format expects. */
534 if (ebd->elf_machine_code != i_ehdrp->e_machine
535 && (ebd->elf_machine_alt1 == 0 || i_ehdrp->e_machine != ebd->elf_machine_alt1)
536 && (ebd->elf_machine_alt2 == 0 || i_ehdrp->e_machine != ebd->elf_machine_alt2))
538 const bfd_target * const *target_ptr;
540 if (ebd->elf_machine_code != EM_NONE)
541 goto got_wrong_format_error;
543 /* This is the generic ELF target. Let it match any ELF target
544 for which we do not have a specific backend. */
545 for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++)
547 struct elf_backend_data *back;
549 if ((*target_ptr)->flavour != bfd_target_elf_flavour)
551 back = (struct elf_backend_data *) (*target_ptr)->backend_data;
552 if (back->elf_machine_code == i_ehdrp->e_machine
553 || (back->elf_machine_alt1 != 0
554 && back->elf_machine_alt1 == i_ehdrp->e_machine)
555 || (back->elf_machine_alt2 != 0
556 && back->elf_machine_alt2 == i_ehdrp->e_machine))
558 /* target_ptr is an ELF backend which matches this
559 object file, so reject the generic ELF target. */
560 goto got_wrong_format_error;
565 if (i_ehdrp->e_type == ET_EXEC)
566 abfd->flags |= EXEC_P;
567 else if (i_ehdrp->e_type == ET_DYN)
568 abfd->flags |= DYNAMIC;
570 if (i_ehdrp->e_phnum > 0)
571 abfd->flags |= D_PAGED;
573 if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0))
576 /* Remember the entry point specified in the ELF file header. */
577 bfd_get_start_address (abfd) = i_ehdrp->e_entry;
579 /* Allocate space for a copy of the section header table in
580 internal form, seek to the section header table in the file,
581 read it in, and convert it to internal form. */
582 i_shdrp = ((Elf_Internal_Shdr *)
583 bfd_alloc (abfd, sizeof (*i_shdrp) * i_ehdrp->e_shnum));
584 elf_elfsections (abfd) = ((Elf_Internal_Shdr **)
586 sizeof (i_shdrp) * i_ehdrp->e_shnum));
587 if (!i_shdrp || !elf_elfsections (abfd))
589 if (bfd_seek (abfd, i_ehdrp->e_shoff, SEEK_SET) != 0)
591 for (shindex = 0; shindex < i_ehdrp->e_shnum; shindex++)
593 if (bfd_read ((PTR) & x_shdr, sizeof x_shdr, 1, abfd) != sizeof (x_shdr))
595 elf_swap_shdr_in (abfd, &x_shdr, i_shdrp + shindex);
596 elf_elfsections (abfd)[shindex] = i_shdrp + shindex;
598 if (i_ehdrp->e_shstrndx)
600 if (! bfd_section_from_shdr (abfd, i_ehdrp->e_shstrndx))
604 /* Read in the program headers. */
605 if (i_ehdrp->e_phnum == 0)
606 elf_tdata (abfd)->phdr = NULL;
609 Elf_Internal_Phdr *i_phdr;
612 elf_tdata (abfd)->phdr = ((Elf_Internal_Phdr *)
615 * sizeof (Elf_Internal_Phdr))));
616 if (elf_tdata (abfd)->phdr == NULL)
618 if (bfd_seek (abfd, i_ehdrp->e_phoff, SEEK_SET) != 0)
620 i_phdr = elf_tdata (abfd)->phdr;
621 for (i = 0; i < i_ehdrp->e_phnum; i++, i_phdr++)
623 Elf_External_Phdr x_phdr;
625 if (bfd_read ((PTR) &x_phdr, sizeof x_phdr, 1, abfd)
628 elf_swap_phdr_in (abfd, &x_phdr, i_phdr);
632 /* Read in the string table containing the names of the sections. We
633 will need the base pointer to this table later. */
634 /* We read this inline now, so that we don't have to go through
635 bfd_section_from_shdr with it (since this particular strtab is
636 used to find all of the ELF section names.) */
638 shstrtab = bfd_elf_get_str_section (abfd, i_ehdrp->e_shstrndx);
642 /* Once all of the section headers have been read and converted, we
643 can start processing them. Note that the first section header is
644 a dummy placeholder entry, so we ignore it. */
646 for (shindex = 1; shindex < i_ehdrp->e_shnum; shindex++)
648 if (! bfd_section_from_shdr (abfd, shindex))
652 /* Let the backend double check the format and override global
654 if (ebd->elf_backend_object_p)
656 if ((*ebd->elf_backend_object_p) (abfd) == false)
657 goto got_wrong_format_error;
662 got_wrong_format_error:
663 bfd_set_error (bfd_error_wrong_format);
666 if (new_tdata != NULL
667 && new_tdata->elf_sect_ptr != NULL)
668 bfd_release (abfd, new_tdata->elf_sect_ptr);
670 bfd_release (abfd, i_shdrp);
671 if (new_tdata != NULL)
672 bfd_release (abfd, new_tdata);
673 elf_tdata (abfd) = preserved_tdata;
677 /* ELF .o/exec file writing */
679 /* Try to convert a non-ELF reloc into an ELF one. */
682 validate_reloc (abfd, areloc)
686 /* Check whether we really have an ELF howto. */
688 if ((*areloc->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec)
690 bfd_reloc_code_real_type code;
691 reloc_howto_type *howto;
693 /* Alien reloc: Try to determine its type to replace it with an
694 equivalent ELF reloc. */
696 if (areloc->howto->pc_relative)
698 switch (areloc->howto->bitsize)
701 code = BFD_RELOC_8_PCREL;
704 code = BFD_RELOC_12_PCREL;
707 code = BFD_RELOC_16_PCREL;
710 code = BFD_RELOC_24_PCREL;
713 code = BFD_RELOC_32_PCREL;
716 code = BFD_RELOC_64_PCREL;
722 howto = bfd_reloc_type_lookup (abfd, code);
724 if (areloc->howto->pcrel_offset != howto->pcrel_offset)
726 if (howto->pcrel_offset)
727 areloc->addend += areloc->address;
729 areloc->addend -= areloc->address; /* addend is unsigned!! */
734 switch (areloc->howto->bitsize)
758 howto = bfd_reloc_type_lookup (abfd, code);
762 areloc->howto = howto;
770 (*_bfd_error_handler)
771 ("%s: unsupported relocation type %s",
772 bfd_get_filename (abfd), areloc->howto->name);
773 bfd_set_error (bfd_error_bad_value);
777 /* Write out the relocs. */
780 write_relocs (abfd, sec, data)
785 boolean *failedp = (boolean *) data;
786 Elf_Internal_Shdr *rela_hdr;
787 Elf_External_Rela *outbound_relocas;
788 Elf_External_Rel *outbound_relocs;
790 int use_rela_p = get_elf_backend_data (abfd)->use_rela_p;
791 asymbol *last_sym = 0;
792 int last_sym_idx = 0;
794 /* If we have already failed, don't do anything. */
798 if ((sec->flags & SEC_RELOC) == 0)
801 /* The linker backend writes the relocs out itself, and sets the
802 reloc_count field to zero to inhibit writing them here. Also,
803 sometimes the SEC_RELOC flag gets set even when there aren't any
805 if (sec->reloc_count == 0)
808 rela_hdr = &elf_section_data (sec)->rel_hdr;
810 rela_hdr->sh_size = rela_hdr->sh_entsize * sec->reloc_count;
811 rela_hdr->contents = (PTR) bfd_alloc (abfd, rela_hdr->sh_size);
812 if (rela_hdr->contents == NULL)
818 /* orelocation has the data, reloc_count has the count... */
821 outbound_relocas = (Elf_External_Rela *) rela_hdr->contents;
823 for (idx = 0; idx < sec->reloc_count; idx++)
825 Elf_Internal_Rela dst_rela;
826 Elf_External_Rela *src_rela;
831 ptr = sec->orelocation[idx];
832 src_rela = outbound_relocas + idx;
834 /* The address of an ELF reloc is section relative for an object
835 file, and absolute for an executable file or shared library.
836 The address of a BFD reloc is always section relative. */
837 if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0)
838 dst_rela.r_offset = ptr->address;
840 dst_rela.r_offset = ptr->address + sec->vma;
842 sym = *ptr->sym_ptr_ptr;
848 n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym);
857 if ((*ptr->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec
858 && ! validate_reloc (abfd, ptr))
864 dst_rela.r_info = ELF_R_INFO (n, ptr->howto->type);
866 dst_rela.r_addend = ptr->addend;
867 elf_swap_reloca_out (abfd, &dst_rela, src_rela);
871 /* REL relocations */
873 outbound_relocs = (Elf_External_Rel *) rela_hdr->contents;
875 for (idx = 0; idx < sec->reloc_count; idx++)
877 Elf_Internal_Rel dst_rel;
878 Elf_External_Rel *src_rel;
883 ptr = sec->orelocation[idx];
884 sym = *ptr->sym_ptr_ptr;
885 src_rel = outbound_relocs + idx;
887 /* The address of an ELF reloc is section relative for an object
888 file, and absolute for an executable file or shared library.
889 The address of a BFD reloc is always section relative. */
890 if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0)
891 dst_rel.r_offset = ptr->address;
893 dst_rel.r_offset = ptr->address + sec->vma;
900 n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym);
909 if ((*ptr->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec
910 && ! validate_reloc (abfd, ptr))
916 dst_rel.r_info = ELF_R_INFO (n, ptr->howto->type);
918 elf_swap_reloc_out (abfd, &dst_rel, src_rel);
923 /* Write out the program headers. */
926 elf_write_out_phdrs (abfd, phdr, count)
928 const Elf_Internal_Phdr *phdr;
933 Elf_External_Phdr extphdr;
934 elf_swap_phdr_out (abfd, phdr, &extphdr);
935 if (bfd_write (&extphdr, sizeof (Elf_External_Phdr), 1, abfd)
936 != sizeof (Elf_External_Phdr))
943 /* Write out the section headers and the ELF file header. */
946 elf_write_shdrs_and_ehdr (abfd)
949 Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
950 Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
951 Elf_External_Shdr *x_shdrp; /* Section header table, external form */
952 Elf_Internal_Shdr **i_shdrp; /* Section header table, internal form */
955 i_ehdrp = elf_elfheader (abfd);
956 i_shdrp = elf_elfsections (abfd);
958 /* swap the header before spitting it out... */
961 elf_debug_file (i_ehdrp);
963 elf_swap_ehdr_out (abfd, i_ehdrp, &x_ehdr);
964 if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
965 || (bfd_write ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd)
969 /* at this point we've concocted all the ELF sections... */
970 x_shdrp = (Elf_External_Shdr *)
971 bfd_alloc (abfd, sizeof (*x_shdrp) * (i_ehdrp->e_shnum));
975 for (count = 0; count < i_ehdrp->e_shnum; count++)
978 elf_debug_section (count, i_shdrp[count]);
980 elf_swap_shdr_out (abfd, i_shdrp[count], x_shdrp + count);
982 if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_shoff, SEEK_SET) != 0
983 || (bfd_write ((PTR) x_shdrp, sizeof (*x_shdrp), i_ehdrp->e_shnum, abfd)
984 != sizeof (*x_shdrp) * i_ehdrp->e_shnum))
987 /* need to dump the string table too... */
993 elf_slurp_symbol_table (abfd, symptrs, dynamic)
995 asymbol **symptrs; /* Buffer for generated bfd symbols */
998 Elf_Internal_Shdr *hdr;
999 long symcount; /* Number of external ELF symbols */
1000 elf_symbol_type *sym; /* Pointer to current bfd symbol */
1001 elf_symbol_type *symbase; /* Buffer for generated bfd symbols */
1002 Elf_Internal_Sym i_sym;
1003 Elf_External_Sym *x_symp = NULL;
1005 /* Read each raw ELF symbol, converting from external ELF form to
1006 internal ELF form, and then using the information to create a
1007 canonical bfd symbol table entry.
1009 Note that we allocate the initial bfd canonical symbol buffer
1010 based on a one-to-one mapping of the ELF symbols to canonical
1011 symbols. We actually use all the ELF symbols, so there will be no
1012 space left over at the end. When we have all the symbols, we
1013 build the caller's pointer vector. */
1016 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
1018 hdr = &elf_tdata (abfd)->symtab_hdr;
1019 if (bfd_seek (abfd, hdr->sh_offset, SEEK_SET) == -1)
1022 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
1025 sym = symbase = NULL;
1030 if (bfd_seek (abfd, hdr->sh_offset, SEEK_SET) == -1)
1033 symbase = ((elf_symbol_type *)
1034 bfd_zalloc (abfd, symcount * sizeof (elf_symbol_type)));
1035 if (symbase == (elf_symbol_type *) NULL)
1039 /* Temporarily allocate room for the raw ELF symbols. */
1040 x_symp = ((Elf_External_Sym *)
1041 bfd_malloc (symcount * sizeof (Elf_External_Sym)));
1042 if (x_symp == NULL && symcount != 0)
1045 if (bfd_read ((PTR) x_symp, sizeof (Elf_External_Sym), symcount, abfd)
1046 != symcount * sizeof (Elf_External_Sym))
1048 /* Skip first symbol, which is a null dummy. */
1049 for (i = 1; i < symcount; i++)
1051 elf_swap_symbol_in (abfd, x_symp + i, &i_sym);
1052 memcpy (&sym->internal_elf_sym, &i_sym, sizeof (Elf_Internal_Sym));
1053 #ifdef ELF_KEEP_EXTSYM
1054 memcpy (&sym->native_elf_sym, x_symp + i, sizeof (Elf_External_Sym));
1056 sym->symbol.the_bfd = abfd;
1058 sym->symbol.name = bfd_elf_string_from_elf_section (abfd,
1062 sym->symbol.value = i_sym.st_value;
1064 if (i_sym.st_shndx > 0 && i_sym.st_shndx < SHN_LORESERVE)
1066 sym->symbol.section = section_from_elf_index (abfd,
1068 if (sym->symbol.section == NULL)
1070 /* This symbol is in a section for which we did not
1071 create a BFD section. Just use bfd_abs_section,
1072 although it is wrong. FIXME. */
1073 sym->symbol.section = bfd_abs_section_ptr;
1076 else if (i_sym.st_shndx == SHN_ABS)
1078 sym->symbol.section = bfd_abs_section_ptr;
1080 else if (i_sym.st_shndx == SHN_COMMON)
1082 sym->symbol.section = bfd_com_section_ptr;
1083 /* Elf puts the alignment into the `value' field, and
1084 the size into the `size' field. BFD wants to see the
1085 size in the value field, and doesn't care (at the
1086 moment) about the alignment. */
1087 sym->symbol.value = i_sym.st_size;
1089 else if (i_sym.st_shndx == SHN_UNDEF)
1091 sym->symbol.section = bfd_und_section_ptr;
1094 sym->symbol.section = bfd_abs_section_ptr;
1096 sym->symbol.value -= sym->symbol.section->vma;
1098 switch (ELF_ST_BIND (i_sym.st_info))
1101 sym->symbol.flags |= BSF_LOCAL;
1104 if (i_sym.st_shndx != SHN_UNDEF
1105 && i_sym.st_shndx != SHN_COMMON)
1106 sym->symbol.flags |= BSF_GLOBAL;
1109 sym->symbol.flags |= BSF_WEAK;
1113 switch (ELF_ST_TYPE (i_sym.st_info))
1116 sym->symbol.flags |= BSF_SECTION_SYM | BSF_DEBUGGING;
1119 sym->symbol.flags |= BSF_FILE | BSF_DEBUGGING;
1122 sym->symbol.flags |= BSF_FUNCTION;
1125 sym->symbol.flags |= BSF_OBJECT;
1130 sym->symbol.flags |= BSF_DYNAMIC;
1132 /* Do some backend-specific processing on this symbol. */
1134 struct elf_backend_data *ebd = get_elf_backend_data (abfd);
1135 if (ebd->elf_backend_symbol_processing)
1136 (*ebd->elf_backend_symbol_processing) (abfd, &sym->symbol);
1143 /* Do some backend-specific processing on this symbol table. */
1145 struct elf_backend_data *ebd = get_elf_backend_data (abfd);
1146 if (ebd->elf_backend_symbol_table_processing)
1147 (*ebd->elf_backend_symbol_table_processing) (abfd, symbase, symcount);
1150 /* We rely on the zalloc to clear out the final symbol entry. */
1152 symcount = sym - symbase;
1154 /* Fill in the user's symbol pointer vector if needed. */
1162 *symptrs++ = &sym->symbol;
1165 *symptrs = 0; /* Final null pointer */
1177 /* Read in and swap the external relocs. */
1180 elf_slurp_reloc_table (abfd, asect, symbols)
1185 struct elf_backend_data * const ebd = get_elf_backend_data (abfd);
1186 struct bfd_elf_section_data * const d = elf_section_data (asect);
1187 PTR allocated = NULL;
1188 bfd_byte *native_relocs;
1194 if (asect->relocation != NULL
1195 || (asect->flags & SEC_RELOC) == 0
1196 || asect->reloc_count == 0)
1199 BFD_ASSERT (asect->rel_filepos == d->rel_hdr.sh_offset
1200 && (asect->reloc_count
1201 == d->rel_hdr.sh_size / d->rel_hdr.sh_entsize));
1203 allocated = (PTR) bfd_malloc ((size_t) d->rel_hdr.sh_size);
1204 if (allocated == NULL)
1207 if (bfd_seek (abfd, asect->rel_filepos, SEEK_SET) != 0
1208 || (bfd_read (allocated, 1, d->rel_hdr.sh_size, abfd)
1209 != d->rel_hdr.sh_size))
1212 native_relocs = (bfd_byte *) allocated;
1214 relents = ((arelent *)
1215 bfd_alloc (abfd, asect->reloc_count * sizeof (arelent)));
1216 if (relents == NULL)
1219 entsize = d->rel_hdr.sh_entsize;
1220 BFD_ASSERT (entsize == sizeof (Elf_External_Rel)
1221 || entsize == sizeof (Elf_External_Rela));
1223 for (i = 0, relent = relents;
1224 i < asect->reloc_count;
1225 i++, relent++, native_relocs += entsize)
1227 Elf_Internal_Rela rela;
1228 Elf_Internal_Rel rel;
1230 if (entsize == sizeof (Elf_External_Rela))
1231 elf_swap_reloca_in (abfd, (Elf_External_Rela *) native_relocs, &rela);
1234 elf_swap_reloc_in (abfd, (Elf_External_Rel *) native_relocs, &rel);
1235 rela.r_offset = rel.r_offset;
1236 rela.r_info = rel.r_info;
1240 /* The address of an ELF reloc is section relative for an object
1241 file, and absolute for an executable file or shared library.
1242 The address of a BFD reloc is always section relative. */
1243 if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0)
1244 relent->address = rela.r_offset;
1246 relent->address = rela.r_offset - asect->vma;
1248 if (ELF_R_SYM (rela.r_info) == 0)
1249 relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
1254 ps = symbols + ELF_R_SYM (rela.r_info) - 1;
1257 /* Canonicalize ELF section symbols. FIXME: Why? */
1258 if ((s->flags & BSF_SECTION_SYM) == 0)
1259 relent->sym_ptr_ptr = ps;
1261 relent->sym_ptr_ptr = s->section->symbol_ptr_ptr;
1264 relent->addend = rela.r_addend;
1266 if (entsize == sizeof (Elf_External_Rela))
1267 (*ebd->elf_info_to_howto) (abfd, relent, &rela);
1269 (*ebd->elf_info_to_howto_rel) (abfd, relent, &rel);
1272 asect->relocation = relents;
1274 if (allocated != NULL)
1280 if (allocated != NULL)
1287 elf_debug_section (num, hdr)
1289 Elf_Internal_Shdr *hdr;
1291 fprintf (stderr, "\nSection#%d '%s' 0x%.8lx\n", num,
1292 hdr->bfd_section != NULL ? hdr->bfd_section->name : "",
1295 "sh_name = %ld\tsh_type = %ld\tsh_flags = %ld\n",
1296 (long) hdr->sh_name,
1297 (long) hdr->sh_type,
1298 (long) hdr->sh_flags);
1300 "sh_addr = %ld\tsh_offset = %ld\tsh_size = %ld\n",
1301 (long) hdr->sh_addr,
1302 (long) hdr->sh_offset,
1303 (long) hdr->sh_size);
1305 "sh_link = %ld\tsh_info = %ld\tsh_addralign = %ld\n",
1306 (long) hdr->sh_link,
1307 (long) hdr->sh_info,
1308 (long) hdr->sh_addralign);
1309 fprintf (stderr, "sh_entsize = %ld\n",
1310 (long) hdr->sh_entsize);
1315 elf_debug_file (ehdrp)
1316 Elf_Internal_Ehdr *ehdrp;
1318 fprintf (stderr, "e_entry = 0x%.8lx\n", (long) ehdrp->e_entry);
1319 fprintf (stderr, "e_phoff = %ld\n", (long) ehdrp->e_phoff);
1320 fprintf (stderr, "e_phnum = %ld\n", (long) ehdrp->e_phnum);
1321 fprintf (stderr, "e_phentsize = %ld\n", (long) ehdrp->e_phentsize);
1322 fprintf (stderr, "e_shoff = %ld\n", (long) ehdrp->e_shoff);
1323 fprintf (stderr, "e_shnum = %ld\n", (long) ehdrp->e_shnum);
1324 fprintf (stderr, "e_shentsize = %ld\n", (long) ehdrp->e_shentsize);
1328 elf_symbol_flags (flags)
1331 static char buffer[1024];
1334 if (flags & BSF_LOCAL)
1335 strcat (buffer, " local");
1337 if (flags & BSF_GLOBAL)
1338 strcat (buffer, " global");
1340 if (flags & BSF_DEBUGGING)
1341 strcat (buffer, " debug");
1343 if (flags & BSF_FUNCTION)
1344 strcat (buffer, " function");
1346 if (flags & BSF_KEEP)
1347 strcat (buffer, " keep");
1349 if (flags & BSF_KEEP_G)
1350 strcat (buffer, " keep_g");
1352 if (flags & BSF_WEAK)
1353 strcat (buffer, " weak");
1355 if (flags & BSF_SECTION_SYM)
1356 strcat (buffer, " section-sym");
1358 if (flags & BSF_OLD_COMMON)
1359 strcat (buffer, " old-common");
1361 if (flags & BSF_NOT_AT_END)
1362 strcat (buffer, " not-at-end");
1364 if (flags & BSF_CONSTRUCTOR)
1365 strcat (buffer, " constructor");
1367 if (flags & BSF_WARNING)
1368 strcat (buffer, " warning");
1370 if (flags & BSF_INDIRECT)
1371 strcat (buffer, " indirect");
1373 if (flags & BSF_FILE)
1374 strcat (buffer, " file");
1376 if (flags & DYNAMIC)
1377 strcat (buffer, " dynamic");
1379 if (flags & ~(BSF_LOCAL
1394 strcat (buffer, " unknown-bits");
1400 #include "elfcore.h"
1401 #include "elflink.h"
1403 /* Size-dependent data and functions. */
1404 const struct elf_size_info NAME(_bfd_elf,size_info) = {
1405 sizeof (Elf_External_Ehdr),
1406 sizeof (Elf_External_Phdr),
1407 sizeof (Elf_External_Shdr),
1408 sizeof (Elf_External_Rel),
1409 sizeof (Elf_External_Rela),
1410 sizeof (Elf_External_Sym),
1411 sizeof (Elf_External_Dyn),
1412 sizeof (Elf_External_Note),
1414 ARCH_SIZE, FILE_ALIGN,
1415 ELFCLASS, EV_CURRENT,
1416 elf_write_out_phdrs,
1417 elf_write_shdrs_and_ehdr,
1419 elf_swap_symbol_out,
1420 elf_slurp_reloc_table,
1421 elf_slurp_symbol_table,