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 #define section_from_elf_index bfd_section_from_elf_index
159 static boolean elf_slurp_reloc_table
160 PARAMS ((bfd *, asection *, asymbol **, boolean));
162 static void write_relocs PARAMS ((bfd *, asection *, PTR));
165 static void elf_debug_section PARAMS ((int, Elf_Internal_Shdr *));
166 static void elf_debug_file PARAMS ((Elf_Internal_Ehdr *));
167 static char *elf_symbol_flags PARAMS ((flagword));
170 /* Structure swapping routines */
172 /* Should perhaps use put_offset, put_word, etc. For now, the two versions
173 can be handled by explicitly specifying 32 bits or "the long type". */
175 #define put_word bfd_h_put_64
176 #define get_word bfd_h_get_64
179 #define put_word bfd_h_put_32
180 #define get_word bfd_h_get_32
183 /* Translate an ELF symbol in external format into an ELF symbol in internal
187 elf_swap_symbol_in (abfd, src, dst)
189 const Elf_External_Sym *src;
190 Elf_Internal_Sym *dst;
192 dst->st_name = bfd_h_get_32 (abfd, (bfd_byte *) src->st_name);
193 dst->st_value = get_word (abfd, (bfd_byte *) src->st_value);
194 dst->st_size = get_word (abfd, (bfd_byte *) src->st_size);
195 dst->st_info = bfd_h_get_8 (abfd, (bfd_byte *) src->st_info);
196 dst->st_other = bfd_h_get_8 (abfd, (bfd_byte *) src->st_other);
197 dst->st_shndx = bfd_h_get_16 (abfd, (bfd_byte *) src->st_shndx);
200 /* Translate an ELF symbol in internal format into an ELF symbol in external
204 elf_swap_symbol_out (abfd, src, cdst)
206 const Elf_Internal_Sym *src;
209 Elf_External_Sym *dst = (Elf_External_Sym *) cdst;
210 bfd_h_put_32 (abfd, src->st_name, dst->st_name);
211 put_word (abfd, src->st_value, dst->st_value);
212 put_word (abfd, src->st_size, dst->st_size);
213 bfd_h_put_8 (abfd, src->st_info, dst->st_info);
214 bfd_h_put_8 (abfd, src->st_other, dst->st_other);
215 bfd_h_put_16 (abfd, src->st_shndx, dst->st_shndx);
219 /* Translate an ELF file header in external format into an ELF file header in
223 elf_swap_ehdr_in (abfd, src, dst)
225 const Elf_External_Ehdr *src;
226 Elf_Internal_Ehdr *dst;
228 memcpy (dst->e_ident, src->e_ident, EI_NIDENT);
229 dst->e_type = bfd_h_get_16 (abfd, (bfd_byte *) src->e_type);
230 dst->e_machine = bfd_h_get_16 (abfd, (bfd_byte *) src->e_machine);
231 dst->e_version = bfd_h_get_32 (abfd, (bfd_byte *) src->e_version);
232 dst->e_entry = get_word (abfd, (bfd_byte *) src->e_entry);
233 dst->e_phoff = get_word (abfd, (bfd_byte *) src->e_phoff);
234 dst->e_shoff = get_word (abfd, (bfd_byte *) src->e_shoff);
235 dst->e_flags = bfd_h_get_32 (abfd, (bfd_byte *) src->e_flags);
236 dst->e_ehsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_ehsize);
237 dst->e_phentsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_phentsize);
238 dst->e_phnum = bfd_h_get_16 (abfd, (bfd_byte *) src->e_phnum);
239 dst->e_shentsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shentsize);
240 dst->e_shnum = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shnum);
241 dst->e_shstrndx = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shstrndx);
244 /* Translate an ELF file header in internal format into an ELF file header in
248 elf_swap_ehdr_out (abfd, src, dst)
250 const Elf_Internal_Ehdr *src;
251 Elf_External_Ehdr *dst;
253 memcpy (dst->e_ident, src->e_ident, EI_NIDENT);
254 /* note that all elements of dst are *arrays of unsigned char* already... */
255 bfd_h_put_16 (abfd, src->e_type, dst->e_type);
256 bfd_h_put_16 (abfd, src->e_machine, dst->e_machine);
257 bfd_h_put_32 (abfd, src->e_version, dst->e_version);
258 put_word (abfd, src->e_entry, dst->e_entry);
259 put_word (abfd, src->e_phoff, dst->e_phoff);
260 put_word (abfd, src->e_shoff, dst->e_shoff);
261 bfd_h_put_32 (abfd, src->e_flags, dst->e_flags);
262 bfd_h_put_16 (abfd, src->e_ehsize, dst->e_ehsize);
263 bfd_h_put_16 (abfd, src->e_phentsize, dst->e_phentsize);
264 bfd_h_put_16 (abfd, src->e_phnum, dst->e_phnum);
265 bfd_h_put_16 (abfd, src->e_shentsize, dst->e_shentsize);
266 bfd_h_put_16 (abfd, src->e_shnum, dst->e_shnum);
267 bfd_h_put_16 (abfd, src->e_shstrndx, dst->e_shstrndx);
271 /* Translate an ELF section header table entry in external format into an
272 ELF section header table entry in internal format. */
275 elf_swap_shdr_in (abfd, src, dst)
277 const Elf_External_Shdr *src;
278 Elf_Internal_Shdr *dst;
280 dst->sh_name = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_name);
281 dst->sh_type = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_type);
282 dst->sh_flags = get_word (abfd, (bfd_byte *) src->sh_flags);
283 dst->sh_addr = get_word (abfd, (bfd_byte *) src->sh_addr);
284 dst->sh_offset = get_word (abfd, (bfd_byte *) src->sh_offset);
285 dst->sh_size = get_word (abfd, (bfd_byte *) src->sh_size);
286 dst->sh_link = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_link);
287 dst->sh_info = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_info);
288 dst->sh_addralign = get_word (abfd, (bfd_byte *) src->sh_addralign);
289 dst->sh_entsize = get_word (abfd, (bfd_byte *) src->sh_entsize);
290 dst->bfd_section = NULL;
291 dst->contents = NULL;
294 /* Translate an ELF section header table entry in internal format into an
295 ELF section header table entry in external format. */
298 elf_swap_shdr_out (abfd, src, dst)
300 const Elf_Internal_Shdr *src;
301 Elf_External_Shdr *dst;
303 /* note that all elements of dst are *arrays of unsigned char* already... */
304 bfd_h_put_32 (abfd, src->sh_name, dst->sh_name);
305 bfd_h_put_32 (abfd, src->sh_type, dst->sh_type);
306 put_word (abfd, src->sh_flags, dst->sh_flags);
307 put_word (abfd, src->sh_addr, dst->sh_addr);
308 put_word (abfd, src->sh_offset, dst->sh_offset);
309 put_word (abfd, src->sh_size, dst->sh_size);
310 bfd_h_put_32 (abfd, src->sh_link, dst->sh_link);
311 bfd_h_put_32 (abfd, src->sh_info, dst->sh_info);
312 put_word (abfd, src->sh_addralign, dst->sh_addralign);
313 put_word (abfd, src->sh_entsize, dst->sh_entsize);
317 /* Translate an ELF program header table entry in external format into an
318 ELF program header table entry in internal format. */
321 elf_swap_phdr_in (abfd, src, dst)
323 const Elf_External_Phdr *src;
324 Elf_Internal_Phdr *dst;
326 dst->p_type = bfd_h_get_32 (abfd, (bfd_byte *) src->p_type);
327 dst->p_flags = bfd_h_get_32 (abfd, (bfd_byte *) src->p_flags);
328 dst->p_offset = get_word (abfd, (bfd_byte *) src->p_offset);
329 dst->p_vaddr = get_word (abfd, (bfd_byte *) src->p_vaddr);
330 dst->p_paddr = get_word (abfd, (bfd_byte *) src->p_paddr);
331 dst->p_filesz = get_word (abfd, (bfd_byte *) src->p_filesz);
332 dst->p_memsz = get_word (abfd, (bfd_byte *) src->p_memsz);
333 dst->p_align = get_word (abfd, (bfd_byte *) src->p_align);
337 elf_swap_phdr_out (abfd, src, dst)
339 const Elf_Internal_Phdr *src;
340 Elf_External_Phdr *dst;
342 /* note that all elements of dst are *arrays of unsigned char* already... */
343 bfd_h_put_32 (abfd, src->p_type, dst->p_type);
344 put_word (abfd, src->p_offset, dst->p_offset);
345 put_word (abfd, src->p_vaddr, dst->p_vaddr);
346 put_word (abfd, src->p_paddr, dst->p_paddr);
347 put_word (abfd, src->p_filesz, dst->p_filesz);
348 put_word (abfd, src->p_memsz, dst->p_memsz);
349 bfd_h_put_32 (abfd, src->p_flags, dst->p_flags);
350 put_word (abfd, src->p_align, dst->p_align);
353 /* Translate an ELF reloc from external format to internal format. */
355 elf_swap_reloc_in (abfd, src, dst)
357 const Elf_External_Rel *src;
358 Elf_Internal_Rel *dst;
360 dst->r_offset = get_word (abfd, (bfd_byte *) src->r_offset);
361 dst->r_info = get_word (abfd, (bfd_byte *) src->r_info);
365 elf_swap_reloca_in (abfd, src, dst)
367 const Elf_External_Rela *src;
368 Elf_Internal_Rela *dst;
370 dst->r_offset = get_word (abfd, (bfd_byte *) src->r_offset);
371 dst->r_info = get_word (abfd, (bfd_byte *) src->r_info);
372 dst->r_addend = get_word (abfd, (bfd_byte *) src->r_addend);
375 /* Translate an ELF reloc from internal format to external format. */
377 elf_swap_reloc_out (abfd, src, dst)
379 const Elf_Internal_Rel *src;
380 Elf_External_Rel *dst;
382 put_word (abfd, src->r_offset, dst->r_offset);
383 put_word (abfd, src->r_info, dst->r_info);
387 elf_swap_reloca_out (abfd, src, dst)
389 const Elf_Internal_Rela *src;
390 Elf_External_Rela *dst;
392 put_word (abfd, src->r_offset, dst->r_offset);
393 put_word (abfd, src->r_info, dst->r_info);
394 put_word (abfd, src->r_addend, dst->r_addend);
398 elf_swap_dyn_in (abfd, p, dst)
401 Elf_Internal_Dyn *dst;
403 const Elf_External_Dyn *src = (const Elf_External_Dyn *) p;
405 dst->d_tag = get_word (abfd, src->d_tag);
406 dst->d_un.d_val = get_word (abfd, src->d_un.d_val);
410 elf_swap_dyn_out (abfd, src, dst)
412 const Elf_Internal_Dyn *src;
413 Elf_External_Dyn *dst;
415 put_word (abfd, src->d_tag, dst->d_tag);
416 put_word (abfd, src->d_un.d_val, dst->d_un.d_val);
419 /* ELF .o/exec file reading */
422 /* Begin processing a given object.
424 First we validate the file by reading in the ELF header and checking
427 static INLINE boolean
429 Elf_External_Ehdr *x_ehdrp;
431 return ((x_ehdrp->e_ident[EI_MAG0] == ELFMAG0)
432 && (x_ehdrp->e_ident[EI_MAG1] == ELFMAG1)
433 && (x_ehdrp->e_ident[EI_MAG2] == ELFMAG2)
434 && (x_ehdrp->e_ident[EI_MAG3] == ELFMAG3));
437 /* Check to see if the file associated with ABFD matches the target vector
440 Note that we may be called several times with the same ABFD, but different
441 target vectors, most of which will not match. We have to avoid leaving
442 any side effects in ABFD, or any data it points to (like tdata), if the
443 file does not match the target vector. */
449 Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
450 Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
451 Elf_External_Shdr x_shdr; /* Section header table entry, external form */
452 Elf_Internal_Shdr *i_shdrp = NULL; /* Section header table, internal form */
453 unsigned int shindex;
454 char *shstrtab; /* Internal copy of section header stringtab */
455 struct elf_backend_data *ebd;
456 struct elf_obj_tdata *preserved_tdata = elf_tdata (abfd);
457 struct elf_obj_tdata *new_tdata = NULL;
459 /* Read in the ELF header in external format. */
461 if (bfd_read ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd) != sizeof (x_ehdr))
463 if (bfd_get_error () != bfd_error_system_call)
464 goto got_wrong_format_error;
469 /* Now check to see if we have a valid ELF file, and one that BFD can
470 make use of. The magic number must match, the address size ('class')
471 and byte-swapping must match our XVEC entry, and it must have a
472 section header table (FIXME: See comments re sections at top of this
475 if ((elf_file_p (&x_ehdr) == false) ||
476 (x_ehdr.e_ident[EI_VERSION] != EV_CURRENT) ||
477 (x_ehdr.e_ident[EI_CLASS] != ELFCLASS))
478 goto got_wrong_format_error;
480 /* Check that file's byte order matches xvec's */
481 switch (x_ehdr.e_ident[EI_DATA])
483 case ELFDATA2MSB: /* Big-endian */
484 if (! bfd_header_big_endian (abfd))
485 goto got_wrong_format_error;
487 case ELFDATA2LSB: /* Little-endian */
488 if (! bfd_header_little_endian (abfd))
489 goto got_wrong_format_error;
491 case ELFDATANONE: /* No data encoding specified */
492 default: /* Unknown data encoding specified */
493 goto got_wrong_format_error;
496 /* Allocate an instance of the elf_obj_tdata structure and hook it up to
497 the tdata pointer in the bfd. */
499 new_tdata = ((struct elf_obj_tdata *)
500 bfd_zalloc (abfd, sizeof (struct elf_obj_tdata)));
501 if (new_tdata == NULL)
503 elf_tdata (abfd) = new_tdata;
505 /* Now that we know the byte order, swap in the rest of the header */
506 i_ehdrp = elf_elfheader (abfd);
507 elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp);
509 elf_debug_file (i_ehdrp);
512 /* If there is no section header table, we're hosed. */
513 if (i_ehdrp->e_shoff == 0)
514 goto got_wrong_format_error;
516 /* As a simple sanity check, verify that the what BFD thinks is the
517 size of each section header table entry actually matches the size
518 recorded in the file. */
519 if (i_ehdrp->e_shentsize != sizeof (x_shdr))
520 goto got_wrong_format_error;
522 ebd = get_elf_backend_data (abfd);
524 /* Check that the ELF e_machine field matches what this particular
525 BFD format expects. */
526 if (ebd->elf_machine_code != i_ehdrp->e_machine
527 && (ebd->elf_machine_alt1 == 0 || i_ehdrp->e_machine != ebd->elf_machine_alt1)
528 && (ebd->elf_machine_alt2 == 0 || i_ehdrp->e_machine != ebd->elf_machine_alt2))
530 const bfd_target * const *target_ptr;
532 if (ebd->elf_machine_code != EM_NONE)
533 goto got_wrong_format_error;
535 /* This is the generic ELF target. Let it match any ELF target
536 for which we do not have a specific backend. */
537 for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++)
539 struct elf_backend_data *back;
541 if ((*target_ptr)->flavour != bfd_target_elf_flavour)
543 back = (struct elf_backend_data *) (*target_ptr)->backend_data;
544 if (back->elf_machine_code == i_ehdrp->e_machine
545 || (back->elf_machine_alt1 != 0
546 && back->elf_machine_alt1 == i_ehdrp->e_machine)
547 || (back->elf_machine_alt2 != 0
548 && back->elf_machine_alt2 == i_ehdrp->e_machine))
550 /* target_ptr is an ELF backend which matches this
551 object file, so reject the generic ELF target. */
552 goto got_wrong_format_error;
557 if (i_ehdrp->e_type == ET_EXEC)
558 abfd->flags |= EXEC_P;
559 else if (i_ehdrp->e_type == ET_DYN)
560 abfd->flags |= DYNAMIC;
562 if (i_ehdrp->e_phnum > 0)
563 abfd->flags |= D_PAGED;
565 if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0))
568 /* Remember the entry point specified in the ELF file header. */
569 bfd_get_start_address (abfd) = i_ehdrp->e_entry;
571 /* Allocate space for a copy of the section header table in
572 internal form, seek to the section header table in the file,
573 read it in, and convert it to internal form. */
574 i_shdrp = ((Elf_Internal_Shdr *)
575 bfd_alloc (abfd, sizeof (*i_shdrp) * i_ehdrp->e_shnum));
576 elf_elfsections (abfd) = ((Elf_Internal_Shdr **)
578 sizeof (i_shdrp) * i_ehdrp->e_shnum));
579 if (!i_shdrp || !elf_elfsections (abfd))
581 if (bfd_seek (abfd, i_ehdrp->e_shoff, SEEK_SET) != 0)
583 for (shindex = 0; shindex < i_ehdrp->e_shnum; shindex++)
585 if (bfd_read ((PTR) & x_shdr, sizeof x_shdr, 1, abfd) != sizeof (x_shdr))
587 elf_swap_shdr_in (abfd, &x_shdr, i_shdrp + shindex);
588 elf_elfsections (abfd)[shindex] = i_shdrp + shindex;
590 /* If the section is loaded, but not page aligned, clear
592 if ((i_shdrp[shindex].sh_flags & SHF_ALLOC) != 0
593 && i_shdrp[shindex].sh_type != SHT_NOBITS
594 && (((i_shdrp[shindex].sh_addr - i_shdrp[shindex].sh_offset)
597 abfd->flags &= ~D_PAGED;
599 if (i_ehdrp->e_shstrndx)
601 if (! bfd_section_from_shdr (abfd, i_ehdrp->e_shstrndx))
605 /* Read in the program headers. */
606 if (i_ehdrp->e_phnum == 0)
607 elf_tdata (abfd)->phdr = NULL;
610 Elf_Internal_Phdr *i_phdr;
613 elf_tdata (abfd)->phdr = ((Elf_Internal_Phdr *)
616 * sizeof (Elf_Internal_Phdr))));
617 if (elf_tdata (abfd)->phdr == NULL)
619 if (bfd_seek (abfd, i_ehdrp->e_phoff, SEEK_SET) != 0)
621 i_phdr = elf_tdata (abfd)->phdr;
622 for (i = 0; i < i_ehdrp->e_phnum; i++, i_phdr++)
624 Elf_External_Phdr x_phdr;
626 if (bfd_read ((PTR) &x_phdr, sizeof x_phdr, 1, abfd)
629 elf_swap_phdr_in (abfd, &x_phdr, i_phdr);
633 /* Read in the string table containing the names of the sections. We
634 will need the base pointer to this table later. */
635 /* We read this inline now, so that we don't have to go through
636 bfd_section_from_shdr with it (since this particular strtab is
637 used to find all of the ELF section names.) */
639 shstrtab = bfd_elf_get_str_section (abfd, i_ehdrp->e_shstrndx);
643 /* Once all of the section headers have been read and converted, we
644 can start processing them. Note that the first section header is
645 a dummy placeholder entry, so we ignore it. */
647 for (shindex = 1; shindex < i_ehdrp->e_shnum; shindex++)
649 if (! bfd_section_from_shdr (abfd, shindex))
653 /* Let the backend double check the format and override global
655 if (ebd->elf_backend_object_p)
657 if ((*ebd->elf_backend_object_p) (abfd) == false)
658 goto got_wrong_format_error;
663 got_wrong_format_error:
664 bfd_set_error (bfd_error_wrong_format);
667 if (new_tdata != NULL
668 && new_tdata->elf_sect_ptr != NULL)
669 bfd_release (abfd, new_tdata->elf_sect_ptr);
671 bfd_release (abfd, i_shdrp);
672 if (new_tdata != NULL)
673 bfd_release (abfd, new_tdata);
674 elf_tdata (abfd) = preserved_tdata;
678 /* ELF .o/exec file writing */
680 /* Write out the relocs. */
683 write_relocs (abfd, sec, data)
688 boolean *failedp = (boolean *) data;
689 Elf_Internal_Shdr *rela_hdr;
690 Elf_External_Rela *outbound_relocas;
691 Elf_External_Rel *outbound_relocs;
693 int use_rela_p = get_elf_backend_data (abfd)->use_rela_p;
694 asymbol *last_sym = 0;
695 int last_sym_idx = 0;
697 /* If we have already failed, don't do anything. */
701 if ((sec->flags & SEC_RELOC) == 0)
704 /* The linker backend writes the relocs out itself, and sets the
705 reloc_count field to zero to inhibit writing them here. Also,
706 sometimes the SEC_RELOC flag gets set even when there aren't any
708 if (sec->reloc_count == 0)
711 rela_hdr = &elf_section_data (sec)->rel_hdr;
713 rela_hdr->sh_size = rela_hdr->sh_entsize * sec->reloc_count;
714 rela_hdr->contents = (PTR) bfd_alloc (abfd, rela_hdr->sh_size);
715 if (rela_hdr->contents == NULL)
721 /* orelocation has the data, reloc_count has the count... */
724 outbound_relocas = (Elf_External_Rela *) rela_hdr->contents;
726 for (idx = 0; idx < sec->reloc_count; idx++)
728 Elf_Internal_Rela dst_rela;
729 Elf_External_Rela *src_rela;
734 ptr = sec->orelocation[idx];
735 src_rela = outbound_relocas + idx;
737 /* The address of an ELF reloc is section relative for an object
738 file, and absolute for an executable file or shared library.
739 The address of a BFD reloc is always section relative. */
740 if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0)
741 dst_rela.r_offset = ptr->address;
743 dst_rela.r_offset = ptr->address + sec->vma;
745 sym = *ptr->sym_ptr_ptr;
748 else if (bfd_is_abs_section (sym->section) && sym->value == 0)
753 n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym);
762 if ((*ptr->sym_ptr_ptr)->the_bfd != NULL
763 && (*ptr->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec
764 && ! _bfd_elf_validate_reloc (abfd, ptr))
770 dst_rela.r_info = ELF_R_INFO (n, ptr->howto->type);
772 dst_rela.r_addend = ptr->addend;
773 elf_swap_reloca_out (abfd, &dst_rela, src_rela);
777 /* REL relocations */
779 outbound_relocs = (Elf_External_Rel *) rela_hdr->contents;
781 for (idx = 0; idx < sec->reloc_count; idx++)
783 Elf_Internal_Rel dst_rel;
784 Elf_External_Rel *src_rel;
789 ptr = sec->orelocation[idx];
790 sym = *ptr->sym_ptr_ptr;
791 src_rel = outbound_relocs + idx;
793 /* The address of an ELF reloc is section relative for an object
794 file, and absolute for an executable file or shared library.
795 The address of a BFD reloc is always section relative. */
796 if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0)
797 dst_rel.r_offset = ptr->address;
799 dst_rel.r_offset = ptr->address + sec->vma;
806 n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym);
815 if ((*ptr->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec
816 && ! _bfd_elf_validate_reloc (abfd, ptr))
822 dst_rel.r_info = ELF_R_INFO (n, ptr->howto->type);
824 elf_swap_reloc_out (abfd, &dst_rel, src_rel);
829 /* Write out the program headers. */
832 elf_write_out_phdrs (abfd, phdr, count)
834 const Elf_Internal_Phdr *phdr;
839 Elf_External_Phdr extphdr;
840 elf_swap_phdr_out (abfd, phdr, &extphdr);
841 if (bfd_write (&extphdr, sizeof (Elf_External_Phdr), 1, abfd)
842 != sizeof (Elf_External_Phdr))
849 /* Write out the section headers and the ELF file header. */
852 elf_write_shdrs_and_ehdr (abfd)
855 Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
856 Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
857 Elf_External_Shdr *x_shdrp; /* Section header table, external form */
858 Elf_Internal_Shdr **i_shdrp; /* Section header table, internal form */
861 i_ehdrp = elf_elfheader (abfd);
862 i_shdrp = elf_elfsections (abfd);
864 /* swap the header before spitting it out... */
867 elf_debug_file (i_ehdrp);
869 elf_swap_ehdr_out (abfd, i_ehdrp, &x_ehdr);
870 if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
871 || (bfd_write ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd)
875 /* at this point we've concocted all the ELF sections... */
876 x_shdrp = (Elf_External_Shdr *)
877 bfd_alloc (abfd, sizeof (*x_shdrp) * (i_ehdrp->e_shnum));
881 for (count = 0; count < i_ehdrp->e_shnum; count++)
884 elf_debug_section (count, i_shdrp[count]);
886 elf_swap_shdr_out (abfd, i_shdrp[count], x_shdrp + count);
888 if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_shoff, SEEK_SET) != 0
889 || (bfd_write ((PTR) x_shdrp, sizeof (*x_shdrp), i_ehdrp->e_shnum, abfd)
890 != sizeof (*x_shdrp) * i_ehdrp->e_shnum))
893 /* need to dump the string table too... */
899 elf_slurp_symbol_table (abfd, symptrs, dynamic)
901 asymbol **symptrs; /* Buffer for generated bfd symbols */
904 Elf_Internal_Shdr *hdr;
905 long symcount; /* Number of external ELF symbols */
906 elf_symbol_type *sym; /* Pointer to current bfd symbol */
907 elf_symbol_type *symbase; /* Buffer for generated bfd symbols */
908 Elf_Internal_Sym i_sym;
909 Elf_External_Sym *x_symp = NULL;
911 /* Read each raw ELF symbol, converting from external ELF form to
912 internal ELF form, and then using the information to create a
913 canonical bfd symbol table entry.
915 Note that we allocate the initial bfd canonical symbol buffer
916 based on a one-to-one mapping of the ELF symbols to canonical
917 symbols. We actually use all the ELF symbols, so there will be no
918 space left over at the end. When we have all the symbols, we
919 build the caller's pointer vector. */
922 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
924 hdr = &elf_tdata (abfd)->symtab_hdr;
925 if (bfd_seek (abfd, hdr->sh_offset, SEEK_SET) == -1)
928 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
931 sym = symbase = NULL;
936 if (bfd_seek (abfd, hdr->sh_offset, SEEK_SET) == -1)
939 symbase = ((elf_symbol_type *)
940 bfd_zalloc (abfd, symcount * sizeof (elf_symbol_type)));
941 if (symbase == (elf_symbol_type *) NULL)
945 /* Temporarily allocate room for the raw ELF symbols. */
946 x_symp = ((Elf_External_Sym *)
947 bfd_malloc (symcount * sizeof (Elf_External_Sym)));
948 if (x_symp == NULL && symcount != 0)
951 if (bfd_read ((PTR) x_symp, sizeof (Elf_External_Sym), symcount, abfd)
952 != symcount * sizeof (Elf_External_Sym))
954 /* Skip first symbol, which is a null dummy. */
955 for (i = 1; i < symcount; i++)
957 elf_swap_symbol_in (abfd, x_symp + i, &i_sym);
958 memcpy (&sym->internal_elf_sym, &i_sym, sizeof (Elf_Internal_Sym));
959 #ifdef ELF_KEEP_EXTSYM
960 memcpy (&sym->native_elf_sym, x_symp + i, sizeof (Elf_External_Sym));
962 sym->symbol.the_bfd = abfd;
964 sym->symbol.name = bfd_elf_string_from_elf_section (abfd,
968 sym->symbol.value = i_sym.st_value;
970 if (i_sym.st_shndx > 0 && i_sym.st_shndx < SHN_LORESERVE)
972 sym->symbol.section = section_from_elf_index (abfd,
974 if (sym->symbol.section == NULL)
976 /* This symbol is in a section for which we did not
977 create a BFD section. Just use bfd_abs_section,
978 although it is wrong. FIXME. */
979 sym->symbol.section = bfd_abs_section_ptr;
982 else if (i_sym.st_shndx == SHN_ABS)
984 sym->symbol.section = bfd_abs_section_ptr;
986 else if (i_sym.st_shndx == SHN_COMMON)
988 sym->symbol.section = bfd_com_section_ptr;
989 /* Elf puts the alignment into the `value' field, and
990 the size into the `size' field. BFD wants to see the
991 size in the value field, and doesn't care (at the
992 moment) about the alignment. */
993 sym->symbol.value = i_sym.st_size;
995 else if (i_sym.st_shndx == SHN_UNDEF)
997 sym->symbol.section = bfd_und_section_ptr;
1000 sym->symbol.section = bfd_abs_section_ptr;
1002 sym->symbol.value -= sym->symbol.section->vma;
1004 switch (ELF_ST_BIND (i_sym.st_info))
1007 sym->symbol.flags |= BSF_LOCAL;
1010 if (i_sym.st_shndx != SHN_UNDEF
1011 && i_sym.st_shndx != SHN_COMMON)
1012 sym->symbol.flags |= BSF_GLOBAL;
1015 sym->symbol.flags |= BSF_WEAK;
1019 switch (ELF_ST_TYPE (i_sym.st_info))
1022 sym->symbol.flags |= BSF_SECTION_SYM | BSF_DEBUGGING;
1025 sym->symbol.flags |= BSF_FILE | BSF_DEBUGGING;
1028 sym->symbol.flags |= BSF_FUNCTION;
1031 sym->symbol.flags |= BSF_OBJECT;
1036 sym->symbol.flags |= BSF_DYNAMIC;
1038 /* Do some backend-specific processing on this symbol. */
1040 struct elf_backend_data *ebd = get_elf_backend_data (abfd);
1041 if (ebd->elf_backend_symbol_processing)
1042 (*ebd->elf_backend_symbol_processing) (abfd, &sym->symbol);
1049 /* Do some backend-specific processing on this symbol table. */
1051 struct elf_backend_data *ebd = get_elf_backend_data (abfd);
1052 if (ebd->elf_backend_symbol_table_processing)
1053 (*ebd->elf_backend_symbol_table_processing) (abfd, symbase, symcount);
1056 /* We rely on the zalloc to clear out the final symbol entry. */
1058 symcount = sym - symbase;
1060 /* Fill in the user's symbol pointer vector if needed. */
1068 *symptrs++ = &sym->symbol;
1071 *symptrs = 0; /* Final null pointer */
1083 /* Read in and swap the external relocs. */
1086 elf_slurp_reloc_table (abfd, asect, symbols, dynamic)
1092 struct elf_backend_data * const ebd = get_elf_backend_data (abfd);
1093 struct bfd_elf_section_data * const d = elf_section_data (asect);
1094 Elf_Internal_Shdr *rel_hdr;
1095 bfd_size_type reloc_count;
1096 PTR allocated = NULL;
1097 bfd_byte *native_relocs;
1103 if (asect->relocation != NULL)
1108 if ((asect->flags & SEC_RELOC) == 0
1109 || asect->reloc_count == 0)
1112 rel_hdr = &d->rel_hdr;
1113 reloc_count = asect->reloc_count;
1115 BFD_ASSERT (asect->rel_filepos == rel_hdr->sh_offset
1116 && reloc_count == rel_hdr->sh_size / rel_hdr->sh_entsize);
1120 if (asect->_raw_size == 0)
1123 rel_hdr = &d->this_hdr;
1124 reloc_count = rel_hdr->sh_size / rel_hdr->sh_entsize;
1127 allocated = (PTR) bfd_malloc ((size_t) rel_hdr->sh_size);
1128 if (allocated == NULL)
1131 if (bfd_seek (abfd, rel_hdr->sh_offset, SEEK_SET) != 0
1132 || (bfd_read (allocated, 1, rel_hdr->sh_size, abfd)
1133 != rel_hdr->sh_size))
1136 native_relocs = (bfd_byte *) allocated;
1138 relents = (arelent *) bfd_alloc (abfd, reloc_count * sizeof (arelent));
1139 if (relents == NULL)
1142 entsize = rel_hdr->sh_entsize;
1143 BFD_ASSERT (entsize == sizeof (Elf_External_Rel)
1144 || entsize == sizeof (Elf_External_Rela));
1146 for (i = 0, relent = relents;
1148 i++, relent++, native_relocs += entsize)
1150 Elf_Internal_Rela rela;
1151 Elf_Internal_Rel rel;
1153 if (entsize == sizeof (Elf_External_Rela))
1154 elf_swap_reloca_in (abfd, (Elf_External_Rela *) native_relocs, &rela);
1157 elf_swap_reloc_in (abfd, (Elf_External_Rel *) native_relocs, &rel);
1158 rela.r_offset = rel.r_offset;
1159 rela.r_info = rel.r_info;
1163 /* The address of an ELF reloc is section relative for an object
1164 file, and absolute for an executable file or shared library.
1165 The address of a normal BFD reloc is always section relative,
1166 and the address of a dynamic reloc is absolute.. */
1167 if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0 || dynamic)
1168 relent->address = rela.r_offset;
1170 relent->address = rela.r_offset - asect->vma;
1172 if (ELF_R_SYM (rela.r_info) == 0)
1173 relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
1178 ps = symbols + ELF_R_SYM (rela.r_info) - 1;
1181 /* Canonicalize ELF section symbols. FIXME: Why? */
1182 if ((s->flags & BSF_SECTION_SYM) == 0)
1183 relent->sym_ptr_ptr = ps;
1185 relent->sym_ptr_ptr = s->section->symbol_ptr_ptr;
1188 relent->addend = rela.r_addend;
1190 if (entsize == sizeof (Elf_External_Rela))
1191 (*ebd->elf_info_to_howto) (abfd, relent, &rela);
1193 (*ebd->elf_info_to_howto_rel) (abfd, relent, &rel);
1196 asect->relocation = relents;
1198 if (allocated != NULL)
1204 if (allocated != NULL)
1211 elf_debug_section (num, hdr)
1213 Elf_Internal_Shdr *hdr;
1215 fprintf (stderr, "\nSection#%d '%s' 0x%.8lx\n", num,
1216 hdr->bfd_section != NULL ? hdr->bfd_section->name : "",
1219 "sh_name = %ld\tsh_type = %ld\tsh_flags = %ld\n",
1220 (long) hdr->sh_name,
1221 (long) hdr->sh_type,
1222 (long) hdr->sh_flags);
1224 "sh_addr = %ld\tsh_offset = %ld\tsh_size = %ld\n",
1225 (long) hdr->sh_addr,
1226 (long) hdr->sh_offset,
1227 (long) hdr->sh_size);
1229 "sh_link = %ld\tsh_info = %ld\tsh_addralign = %ld\n",
1230 (long) hdr->sh_link,
1231 (long) hdr->sh_info,
1232 (long) hdr->sh_addralign);
1233 fprintf (stderr, "sh_entsize = %ld\n",
1234 (long) hdr->sh_entsize);
1239 elf_debug_file (ehdrp)
1240 Elf_Internal_Ehdr *ehdrp;
1242 fprintf (stderr, "e_entry = 0x%.8lx\n", (long) ehdrp->e_entry);
1243 fprintf (stderr, "e_phoff = %ld\n", (long) ehdrp->e_phoff);
1244 fprintf (stderr, "e_phnum = %ld\n", (long) ehdrp->e_phnum);
1245 fprintf (stderr, "e_phentsize = %ld\n", (long) ehdrp->e_phentsize);
1246 fprintf (stderr, "e_shoff = %ld\n", (long) ehdrp->e_shoff);
1247 fprintf (stderr, "e_shnum = %ld\n", (long) ehdrp->e_shnum);
1248 fprintf (stderr, "e_shentsize = %ld\n", (long) ehdrp->e_shentsize);
1252 elf_symbol_flags (flags)
1255 static char buffer[1024];
1258 if (flags & BSF_LOCAL)
1259 strcat (buffer, " local");
1261 if (flags & BSF_GLOBAL)
1262 strcat (buffer, " global");
1264 if (flags & BSF_DEBUGGING)
1265 strcat (buffer, " debug");
1267 if (flags & BSF_FUNCTION)
1268 strcat (buffer, " function");
1270 if (flags & BSF_KEEP)
1271 strcat (buffer, " keep");
1273 if (flags & BSF_KEEP_G)
1274 strcat (buffer, " keep_g");
1276 if (flags & BSF_WEAK)
1277 strcat (buffer, " weak");
1279 if (flags & BSF_SECTION_SYM)
1280 strcat (buffer, " section-sym");
1282 if (flags & BSF_OLD_COMMON)
1283 strcat (buffer, " old-common");
1285 if (flags & BSF_NOT_AT_END)
1286 strcat (buffer, " not-at-end");
1288 if (flags & BSF_CONSTRUCTOR)
1289 strcat (buffer, " constructor");
1291 if (flags & BSF_WARNING)
1292 strcat (buffer, " warning");
1294 if (flags & BSF_INDIRECT)
1295 strcat (buffer, " indirect");
1297 if (flags & BSF_FILE)
1298 strcat (buffer, " file");
1300 if (flags & DYNAMIC)
1301 strcat (buffer, " dynamic");
1303 if (flags & ~(BSF_LOCAL
1318 strcat (buffer, " unknown-bits");
1324 #include "elfcore.h"
1325 #include "elflink.h"
1327 /* Size-dependent data and functions. */
1328 const struct elf_size_info NAME(_bfd_elf,size_info) = {
1329 sizeof (Elf_External_Ehdr),
1330 sizeof (Elf_External_Phdr),
1331 sizeof (Elf_External_Shdr),
1332 sizeof (Elf_External_Rel),
1333 sizeof (Elf_External_Rela),
1334 sizeof (Elf_External_Sym),
1335 sizeof (Elf_External_Dyn),
1336 sizeof (Elf_External_Note),
1338 ARCH_SIZE, FILE_ALIGN,
1339 ELFCLASS, EV_CURRENT,
1340 elf_write_out_phdrs,
1341 elf_write_shdrs_and_ehdr,
1343 elf_swap_symbol_out,
1344 elf_slurp_reloc_table,
1345 elf_slurp_symbol_table,