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
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)
122 #define elf_create_pointer_linker_section NAME(bfd_elf,create_pointer_linker_section)
123 #define elf_finish_pointer_linker_section NAME(bfd_elf,finish_pointer_linker_section)
126 #define ELF_R_INFO(X,Y) ELF64_R_INFO(X,Y)
127 #define ELF_R_SYM(X) ELF64_R_SYM(X)
128 #define ELF_R_TYPE(X) ELF64_R_TYPE(X)
129 #define ELFCLASS ELFCLASS64
131 #define LOG_FILE_ALIGN 3
134 #define ELF_R_INFO(X,Y) ELF32_R_INFO(X,Y)
135 #define ELF_R_SYM(X) ELF32_R_SYM(X)
136 #define ELF_R_TYPE(X) ELF32_R_TYPE(X)
137 #define ELFCLASS ELFCLASS32
139 #define LOG_FILE_ALIGN 2
142 /* Forward declarations of static functions */
144 #define elf_stringtab_init _bfd_elf_stringtab_init
146 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init PARAMS ((void));
147 #define section_from_elf_index bfd_section_from_elf_index
148 extern boolean bfd_section_from_phdr PARAMS ((bfd *, Elf_Internal_Phdr *,
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 boolean validate_reloc PARAMS ((bfd *, arelent *));
159 static void write_relocs PARAMS ((bfd *, asection *, PTR));
161 boolean bfd_section_from_shdr PARAMS ((bfd *, unsigned int shindex));
164 static void elf_debug_section PARAMS ((int, Elf_Internal_Shdr *));
165 static void elf_debug_file PARAMS ((Elf_Internal_Ehdr *));
166 static char *elf_symbol_flags PARAMS ((flagword));
169 /* Structure swapping routines */
171 /* Should perhaps use put_offset, put_word, etc. For now, the two versions
172 can be handled by explicitly specifying 32 bits or "the long type". */
174 #define put_word bfd_h_put_64
175 #define get_word bfd_h_get_64
178 #define put_word bfd_h_put_32
179 #define get_word bfd_h_get_32
182 /* Translate an ELF symbol in external format into an ELF symbol in internal
186 elf_swap_symbol_in (abfd, src, dst)
188 Elf_External_Sym *src;
189 Elf_Internal_Sym *dst;
191 dst->st_name = bfd_h_get_32 (abfd, (bfd_byte *) src->st_name);
192 dst->st_value = get_word (abfd, (bfd_byte *) src->st_value);
193 dst->st_size = get_word (abfd, (bfd_byte *) src->st_size);
194 dst->st_info = bfd_h_get_8 (abfd, (bfd_byte *) src->st_info);
195 dst->st_other = bfd_h_get_8 (abfd, (bfd_byte *) src->st_other);
196 dst->st_shndx = bfd_h_get_16 (abfd, (bfd_byte *) src->st_shndx);
199 /* Translate an ELF symbol in internal format into an ELF symbol in external
203 elf_swap_symbol_out (abfd, src, cdst)
205 Elf_Internal_Sym *src;
208 Elf_External_Sym *dst = (Elf_External_Sym *) cdst;
209 bfd_h_put_32 (abfd, src->st_name, dst->st_name);
210 put_word (abfd, src->st_value, dst->st_value);
211 put_word (abfd, src->st_size, dst->st_size);
212 bfd_h_put_8 (abfd, src->st_info, dst->st_info);
213 bfd_h_put_8 (abfd, src->st_other, dst->st_other);
214 bfd_h_put_16 (abfd, src->st_shndx, dst->st_shndx);
218 /* Translate an ELF file header in external format into an ELF file header in
222 elf_swap_ehdr_in (abfd, src, dst)
224 Elf_External_Ehdr *src;
225 Elf_Internal_Ehdr *dst;
227 memcpy (dst->e_ident, src->e_ident, EI_NIDENT);
228 dst->e_type = bfd_h_get_16 (abfd, (bfd_byte *) src->e_type);
229 dst->e_machine = bfd_h_get_16 (abfd, (bfd_byte *) src->e_machine);
230 dst->e_version = bfd_h_get_32 (abfd, (bfd_byte *) src->e_version);
231 dst->e_entry = get_word (abfd, (bfd_byte *) src->e_entry);
232 dst->e_phoff = get_word (abfd, (bfd_byte *) src->e_phoff);
233 dst->e_shoff = get_word (abfd, (bfd_byte *) src->e_shoff);
234 dst->e_flags = bfd_h_get_32 (abfd, (bfd_byte *) src->e_flags);
235 dst->e_ehsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_ehsize);
236 dst->e_phentsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_phentsize);
237 dst->e_phnum = bfd_h_get_16 (abfd, (bfd_byte *) src->e_phnum);
238 dst->e_shentsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shentsize);
239 dst->e_shnum = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shnum);
240 dst->e_shstrndx = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shstrndx);
243 /* Translate an ELF file header in internal format into an ELF file header in
247 elf_swap_ehdr_out (abfd, src, dst)
249 Elf_Internal_Ehdr *src;
250 Elf_External_Ehdr *dst;
252 memcpy (dst->e_ident, src->e_ident, EI_NIDENT);
253 /* note that all elements of dst are *arrays of unsigned char* already... */
254 bfd_h_put_16 (abfd, src->e_type, dst->e_type);
255 bfd_h_put_16 (abfd, src->e_machine, dst->e_machine);
256 bfd_h_put_32 (abfd, src->e_version, dst->e_version);
257 put_word (abfd, src->e_entry, dst->e_entry);
258 put_word (abfd, src->e_phoff, dst->e_phoff);
259 put_word (abfd, src->e_shoff, dst->e_shoff);
260 bfd_h_put_32 (abfd, src->e_flags, dst->e_flags);
261 bfd_h_put_16 (abfd, src->e_ehsize, dst->e_ehsize);
262 bfd_h_put_16 (abfd, src->e_phentsize, dst->e_phentsize);
263 bfd_h_put_16 (abfd, src->e_phnum, dst->e_phnum);
264 bfd_h_put_16 (abfd, src->e_shentsize, dst->e_shentsize);
265 bfd_h_put_16 (abfd, src->e_shnum, dst->e_shnum);
266 bfd_h_put_16 (abfd, src->e_shstrndx, dst->e_shstrndx);
270 /* Translate an ELF section header table entry in external format into an
271 ELF section header table entry in internal format. */
274 elf_swap_shdr_in (abfd, src, dst)
276 Elf_External_Shdr *src;
277 Elf_Internal_Shdr *dst;
279 dst->sh_name = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_name);
280 dst->sh_type = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_type);
281 dst->sh_flags = get_word (abfd, (bfd_byte *) src->sh_flags);
282 dst->sh_addr = get_word (abfd, (bfd_byte *) src->sh_addr);
283 dst->sh_offset = get_word (abfd, (bfd_byte *) src->sh_offset);
284 dst->sh_size = get_word (abfd, (bfd_byte *) src->sh_size);
285 dst->sh_link = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_link);
286 dst->sh_info = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_info);
287 dst->sh_addralign = get_word (abfd, (bfd_byte *) src->sh_addralign);
288 dst->sh_entsize = get_word (abfd, (bfd_byte *) src->sh_entsize);
289 dst->bfd_section = NULL;
290 dst->contents = NULL;
293 /* Translate an ELF section header table entry in internal format into an
294 ELF section header table entry in external format. */
297 elf_swap_shdr_out (abfd, src, dst)
299 Elf_Internal_Shdr *src;
300 Elf_External_Shdr *dst;
302 /* note that all elements of dst are *arrays of unsigned char* already... */
303 bfd_h_put_32 (abfd, src->sh_name, dst->sh_name);
304 bfd_h_put_32 (abfd, src->sh_type, dst->sh_type);
305 put_word (abfd, src->sh_flags, dst->sh_flags);
306 put_word (abfd, src->sh_addr, dst->sh_addr);
307 put_word (abfd, src->sh_offset, dst->sh_offset);
308 put_word (abfd, src->sh_size, dst->sh_size);
309 bfd_h_put_32 (abfd, src->sh_link, dst->sh_link);
310 bfd_h_put_32 (abfd, src->sh_info, dst->sh_info);
311 put_word (abfd, src->sh_addralign, dst->sh_addralign);
312 put_word (abfd, src->sh_entsize, dst->sh_entsize);
316 /* Translate an ELF program header table entry in external format into an
317 ELF program header table entry in internal format. */
320 elf_swap_phdr_in (abfd, src, dst)
322 Elf_External_Phdr *src;
323 Elf_Internal_Phdr *dst;
325 dst->p_type = bfd_h_get_32 (abfd, (bfd_byte *) src->p_type);
326 dst->p_flags = bfd_h_get_32 (abfd, (bfd_byte *) src->p_flags);
327 dst->p_offset = get_word (abfd, (bfd_byte *) src->p_offset);
328 dst->p_vaddr = get_word (abfd, (bfd_byte *) src->p_vaddr);
329 dst->p_paddr = get_word (abfd, (bfd_byte *) src->p_paddr);
330 dst->p_filesz = get_word (abfd, (bfd_byte *) src->p_filesz);
331 dst->p_memsz = get_word (abfd, (bfd_byte *) src->p_memsz);
332 dst->p_align = get_word (abfd, (bfd_byte *) src->p_align);
336 elf_swap_phdr_out (abfd, src, dst)
338 Elf_Internal_Phdr *src;
339 Elf_External_Phdr *dst;
341 /* note that all elements of dst are *arrays of unsigned char* already... */
342 bfd_h_put_32 (abfd, src->p_type, dst->p_type);
343 put_word (abfd, src->p_offset, dst->p_offset);
344 put_word (abfd, src->p_vaddr, dst->p_vaddr);
345 put_word (abfd, src->p_paddr, dst->p_paddr);
346 put_word (abfd, src->p_filesz, dst->p_filesz);
347 put_word (abfd, src->p_memsz, dst->p_memsz);
348 bfd_h_put_32 (abfd, src->p_flags, dst->p_flags);
349 put_word (abfd, src->p_align, dst->p_align);
352 /* Translate an ELF reloc from external format to internal format. */
354 elf_swap_reloc_in (abfd, src, dst)
356 Elf_External_Rel *src;
357 Elf_Internal_Rel *dst;
359 dst->r_offset = get_word (abfd, (bfd_byte *) src->r_offset);
360 dst->r_info = get_word (abfd, (bfd_byte *) src->r_info);
364 elf_swap_reloca_in (abfd, src, dst)
366 Elf_External_Rela *src;
367 Elf_Internal_Rela *dst;
369 dst->r_offset = get_word (abfd, (bfd_byte *) src->r_offset);
370 dst->r_info = get_word (abfd, (bfd_byte *) src->r_info);
371 dst->r_addend = get_word (abfd, (bfd_byte *) src->r_addend);
374 /* Translate an ELF reloc from internal format to external format. */
376 elf_swap_reloc_out (abfd, src, dst)
378 Elf_Internal_Rel *src;
379 Elf_External_Rel *dst;
381 put_word (abfd, src->r_offset, dst->r_offset);
382 put_word (abfd, src->r_info, dst->r_info);
386 elf_swap_reloca_out (abfd, src, dst)
388 Elf_Internal_Rela *src;
389 Elf_External_Rela *dst;
391 put_word (abfd, src->r_offset, dst->r_offset);
392 put_word (abfd, src->r_info, dst->r_info);
393 put_word (abfd, src->r_addend, dst->r_addend);
397 elf_swap_dyn_in (abfd, p, dst)
400 Elf_Internal_Dyn *dst;
402 const Elf_External_Dyn *src = (const Elf_External_Dyn *) p;
404 dst->d_tag = get_word (abfd, src->d_tag);
405 dst->d_un.d_val = get_word (abfd, src->d_un.d_val);
409 elf_swap_dyn_out (abfd, src, dst)
411 const Elf_Internal_Dyn *src;
412 Elf_External_Dyn *dst;
414 put_word (abfd, src->d_tag, dst->d_tag);
415 put_word (abfd, src->d_un.d_val, dst->d_un.d_val);
418 /* ELF .o/exec file reading */
421 /* Begin processing a given object.
423 First we validate the file by reading in the ELF header and checking
426 static INLINE boolean
428 Elf_External_Ehdr *x_ehdrp;
430 return ((x_ehdrp->e_ident[EI_MAG0] == ELFMAG0)
431 && (x_ehdrp->e_ident[EI_MAG1] == ELFMAG1)
432 && (x_ehdrp->e_ident[EI_MAG2] == ELFMAG2)
433 && (x_ehdrp->e_ident[EI_MAG3] == ELFMAG3));
436 /* Check to see if the file associated with ABFD matches the target vector
439 Note that we may be called several times with the same ABFD, but different
440 target vectors, most of which will not match. We have to avoid leaving
441 any side effects in ABFD, or any data it points to (like tdata), if the
442 file does not match the target vector. */
448 Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
449 Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
450 Elf_External_Shdr x_shdr; /* Section header table entry, external form */
451 Elf_Internal_Shdr *i_shdrp = NULL; /* Section header table, internal form */
452 unsigned int shindex;
453 char *shstrtab; /* Internal copy of section header stringtab */
454 struct elf_backend_data *ebd;
455 struct elf_obj_tdata *preserved_tdata = elf_tdata (abfd);
456 struct elf_obj_tdata *new_tdata = NULL;
458 /* Read in the ELF header in external format. */
460 if (bfd_read ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd) != sizeof (x_ehdr))
462 if (bfd_get_error () != bfd_error_system_call)
463 goto got_wrong_format_error;
468 /* Now check to see if we have a valid ELF file, and one that BFD can
469 make use of. The magic number must match, the address size ('class')
470 and byte-swapping must match our XVEC entry, and it must have a
471 section header table (FIXME: See comments re sections at top of this
474 if ((elf_file_p (&x_ehdr) == false) ||
475 (x_ehdr.e_ident[EI_VERSION] != EV_CURRENT) ||
476 (x_ehdr.e_ident[EI_CLASS] != ELFCLASS))
477 goto got_wrong_format_error;
479 /* Check that file's byte order matches xvec's */
480 switch (x_ehdr.e_ident[EI_DATA])
482 case ELFDATA2MSB: /* Big-endian */
483 if (! bfd_header_big_endian (abfd))
484 goto got_wrong_format_error;
486 case ELFDATA2LSB: /* Little-endian */
487 if (! bfd_header_little_endian (abfd))
488 goto got_wrong_format_error;
490 case ELFDATANONE: /* No data encoding specified */
491 default: /* Unknown data encoding specified */
492 goto got_wrong_format_error;
495 /* Allocate an instance of the elf_obj_tdata structure and hook it up to
496 the tdata pointer in the bfd. */
498 new_tdata = ((struct elf_obj_tdata *)
499 bfd_zalloc (abfd, sizeof (struct elf_obj_tdata)));
500 if (new_tdata == NULL)
502 elf_tdata (abfd) = new_tdata;
504 /* Now that we know the byte order, swap in the rest of the header */
505 i_ehdrp = elf_elfheader (abfd);
506 elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp);
508 elf_debug_file (i_ehdrp);
511 /* If there is no section header table, we're hosed. */
512 if (i_ehdrp->e_shoff == 0)
513 goto got_wrong_format_error;
515 /* As a simple sanity check, verify that the what BFD thinks is the
516 size of each section header table entry actually matches the size
517 recorded in the file. */
518 if (i_ehdrp->e_shentsize != sizeof (x_shdr))
519 goto got_wrong_format_error;
521 ebd = get_elf_backend_data (abfd);
523 /* Check that the ELF e_machine field matches what this particular
524 BFD format expects. */
525 if (ebd->elf_machine_code != i_ehdrp->e_machine
526 && (ebd->elf_machine_alt1 == 0 || i_ehdrp->e_machine != ebd->elf_machine_alt1)
527 && (ebd->elf_machine_alt2 == 0 || i_ehdrp->e_machine != ebd->elf_machine_alt2))
529 const bfd_target * const *target_ptr;
531 if (ebd->elf_machine_code != EM_NONE)
532 goto got_wrong_format_error;
534 /* This is the generic ELF target. Let it match any ELF target
535 for which we do not have a specific backend. */
536 for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++)
538 struct elf_backend_data *back;
540 if ((*target_ptr)->flavour != bfd_target_elf_flavour)
542 back = (struct elf_backend_data *) (*target_ptr)->backend_data;
543 if (back->elf_machine_code == i_ehdrp->e_machine)
545 /* target_ptr is an ELF backend which matches this
546 object file, so reject the generic ELF target. */
547 goto got_wrong_format_error;
552 if (i_ehdrp->e_type == ET_EXEC)
553 abfd->flags |= EXEC_P;
554 else if (i_ehdrp->e_type == ET_DYN)
555 abfd->flags |= DYNAMIC;
557 if (i_ehdrp->e_phnum > 0)
558 abfd->flags |= D_PAGED;
560 if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0))
563 /* Remember the entry point specified in the ELF file header. */
564 bfd_get_start_address (abfd) = i_ehdrp->e_entry;
566 /* Allocate space for a copy of the section header table in
567 internal form, seek to the section header table in the file,
568 read it in, and convert it to internal form. */
569 i_shdrp = ((Elf_Internal_Shdr *)
570 bfd_alloc (abfd, sizeof (*i_shdrp) * i_ehdrp->e_shnum));
571 elf_elfsections (abfd) = ((Elf_Internal_Shdr **)
573 sizeof (i_shdrp) * i_ehdrp->e_shnum));
574 if (!i_shdrp || !elf_elfsections (abfd))
576 if (bfd_seek (abfd, i_ehdrp->e_shoff, SEEK_SET) != 0)
578 for (shindex = 0; shindex < i_ehdrp->e_shnum; shindex++)
580 if (bfd_read ((PTR) & x_shdr, sizeof x_shdr, 1, abfd) != sizeof (x_shdr))
582 elf_swap_shdr_in (abfd, &x_shdr, i_shdrp + shindex);
583 elf_elfsections (abfd)[shindex] = i_shdrp + shindex;
585 if (i_ehdrp->e_shstrndx)
587 if (! bfd_section_from_shdr (abfd, i_ehdrp->e_shstrndx))
591 /* Read in the program headers. */
592 if (i_ehdrp->e_phnum == 0)
593 elf_tdata (abfd)->phdr = NULL;
596 Elf_Internal_Phdr *i_phdr;
599 elf_tdata (abfd)->phdr = ((Elf_Internal_Phdr *)
602 * sizeof (Elf_Internal_Phdr))));
603 if (elf_tdata (abfd)->phdr == NULL)
605 if (bfd_seek (abfd, i_ehdrp->e_phoff, SEEK_SET) != 0)
607 i_phdr = elf_tdata (abfd)->phdr;
608 for (i = 0; i < i_ehdrp->e_phnum; i++, i_phdr++)
610 Elf_External_Phdr x_phdr;
612 if (bfd_read ((PTR) &x_phdr, sizeof x_phdr, 1, abfd)
615 elf_swap_phdr_in (abfd, &x_phdr, i_phdr);
619 /* Read in the string table containing the names of the sections. We
620 will need the base pointer to this table later. */
621 /* We read this inline now, so that we don't have to go through
622 bfd_section_from_shdr with it (since this particular strtab is
623 used to find all of the ELF section names.) */
625 shstrtab = bfd_elf_get_str_section (abfd, i_ehdrp->e_shstrndx);
629 /* Once all of the section headers have been read and converted, we
630 can start processing them. Note that the first section header is
631 a dummy placeholder entry, so we ignore it. */
633 for (shindex = 1; shindex < i_ehdrp->e_shnum; shindex++)
635 if (! bfd_section_from_shdr (abfd, shindex))
639 /* Let the backend double check the format and override global
641 if (ebd->elf_backend_object_p)
643 if ((*ebd->elf_backend_object_p) (abfd) == false)
644 goto got_wrong_format_error;
649 got_wrong_format_error:
650 bfd_set_error (bfd_error_wrong_format);
653 if (new_tdata != NULL
654 && new_tdata->elf_sect_ptr != NULL)
655 bfd_release (abfd, new_tdata->elf_sect_ptr);
657 bfd_release (abfd, i_shdrp);
658 if (new_tdata != NULL)
659 bfd_release (abfd, new_tdata);
660 elf_tdata (abfd) = preserved_tdata;
664 /* ELF .o/exec file writing */
666 /* Try to convert a non-ELF reloc into an ELF one. */
669 validate_reloc (abfd, areloc)
673 /* Check whether we really have an ELF howto. */
675 if ((*areloc->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec)
677 bfd_reloc_code_real_type code;
678 reloc_howto_type *howto;
680 /* Alien reloc: Try to determine its type to replace it with an
681 equivalent ELF reloc. */
683 if (areloc->howto->pc_relative)
685 switch (areloc->howto->bitsize)
688 code = BFD_RELOC_8_PCREL;
691 code = BFD_RELOC_12_PCREL;
694 code = BFD_RELOC_16_PCREL;
697 code = BFD_RELOC_24_PCREL;
700 code = BFD_RELOC_32_PCREL;
703 code = BFD_RELOC_64_PCREL;
709 howto = bfd_reloc_type_lookup (abfd, code);
711 if (areloc->howto->pcrel_offset != howto->pcrel_offset)
713 if (howto->pcrel_offset)
714 areloc->addend += areloc->address;
716 areloc->addend -= areloc->address; /* addend is unsigned!! */
721 switch (areloc->howto->bitsize)
745 howto = bfd_reloc_type_lookup (abfd, code);
749 areloc->howto = howto;
757 (*_bfd_error_handler)
758 ("%s: unsupported relocation type %s",
759 bfd_get_filename (abfd), areloc->howto->name);
760 bfd_set_error (bfd_error_bad_value);
764 /* Write out the relocs. */
767 write_relocs (abfd, sec, data)
772 boolean *failedp = (boolean *) data;
773 Elf_Internal_Shdr *rela_hdr;
774 Elf_External_Rela *outbound_relocas;
775 Elf_External_Rel *outbound_relocs;
777 int use_rela_p = get_elf_backend_data (abfd)->use_rela_p;
778 asymbol *last_sym = 0;
779 int last_sym_idx = 9999999; /* should always be written before use */
781 /* If we have already failed, don't do anything. */
785 if ((sec->flags & SEC_RELOC) == 0)
788 /* The linker backend writes the relocs out itself, and sets the
789 reloc_count field to zero to inhibit writing them here. Also,
790 sometimes the SEC_RELOC flag gets set even when there aren't any
792 if (sec->reloc_count == 0)
795 rela_hdr = &elf_section_data (sec)->rel_hdr;
797 rela_hdr->sh_size = rela_hdr->sh_entsize * sec->reloc_count;
798 rela_hdr->contents = (PTR) bfd_alloc (abfd, rela_hdr->sh_size);
799 if (rela_hdr->contents == NULL)
805 /* orelocation has the data, reloc_count has the count... */
808 outbound_relocas = (Elf_External_Rela *) rela_hdr->contents;
810 for (idx = 0; idx < sec->reloc_count; idx++)
812 Elf_Internal_Rela dst_rela;
813 Elf_External_Rela *src_rela;
818 ptr = sec->orelocation[idx];
819 src_rela = outbound_relocas + idx;
821 /* The address of an ELF reloc is section relative for an object
822 file, and absolute for an executable file or shared library.
823 The address of a BFD reloc is always section relative. */
824 if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0)
825 dst_rela.r_offset = ptr->address;
827 dst_rela.r_offset = ptr->address + sec->vma;
829 sym = *ptr->sym_ptr_ptr;
835 last_sym_idx = n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym);
838 if ((*areloc->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec
839 && ! validate_reloc (abfd, ptr))
845 dst_rela.r_info = ELF_R_INFO (n, ptr->howto->type);
847 dst_rela.r_addend = ptr->addend;
848 elf_swap_reloca_out (abfd, &dst_rela, src_rela);
852 /* REL relocations */
854 outbound_relocs = (Elf_External_Rel *) rela_hdr->contents;
856 for (idx = 0; idx < sec->reloc_count; idx++)
858 Elf_Internal_Rel dst_rel;
859 Elf_External_Rel *src_rel;
864 ptr = sec->orelocation[idx];
865 sym = *ptr->sym_ptr_ptr;
866 src_rel = outbound_relocs + idx;
868 /* The address of an ELF reloc is section relative for an object
869 file, and absolute for an executable file or shared library.
870 The address of a BFD reloc is always section relative. */
871 if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0)
872 dst_rel.r_offset = ptr->address;
874 dst_rel.r_offset = ptr->address + sec->vma;
881 last_sym_idx = n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym);
884 if ((*areloc->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec
885 && ! validate_reloc (abfd, ptr))
891 dst_rel.r_info = ELF_R_INFO (n, ptr->howto->type);
893 elf_swap_reloc_out (abfd, &dst_rel, src_rel);
899 write_out_phdrs (abfd, phdr, count)
901 Elf_Internal_Phdr *phdr;
906 Elf_External_Phdr extphdr;
907 elf_swap_phdr_out (abfd, phdr, &extphdr);
908 if (bfd_write (&extphdr, sizeof (Elf_External_Phdr), 1, abfd)
909 != sizeof (Elf_External_Phdr))
917 write_shdrs_and_ehdr (abfd)
920 Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
921 Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
922 Elf_External_Shdr *x_shdrp; /* Section header table, external form */
923 Elf_Internal_Shdr **i_shdrp; /* Section header table, internal form */
926 i_ehdrp = elf_elfheader (abfd);
927 i_shdrp = elf_elfsections (abfd);
929 /* swap the header before spitting it out... */
932 elf_debug_file (i_ehdrp);
934 elf_swap_ehdr_out (abfd, i_ehdrp, &x_ehdr);
935 if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
936 || (bfd_write ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd)
940 /* at this point we've concocted all the ELF sections... */
941 x_shdrp = (Elf_External_Shdr *)
942 bfd_alloc (abfd, sizeof (*x_shdrp) * (i_ehdrp->e_shnum));
946 for (count = 0; count < i_ehdrp->e_shnum; count++)
949 elf_debug_section (count, i_shdrp[count]);
951 elf_swap_shdr_out (abfd, i_shdrp[count], x_shdrp + count);
953 if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_shoff, SEEK_SET) != 0
954 || (bfd_write ((PTR) x_shdrp, sizeof (*x_shdrp), i_ehdrp->e_shnum, abfd)
955 != sizeof (*x_shdrp) * i_ehdrp->e_shnum))
958 /* need to dump the string table too... */
964 elf_slurp_symbol_table (abfd, symptrs, dynamic)
966 asymbol **symptrs; /* Buffer for generated bfd symbols */
969 Elf_Internal_Shdr *hdr;
970 long symcount; /* Number of external ELF symbols */
971 elf_symbol_type *sym; /* Pointer to current bfd symbol */
972 elf_symbol_type *symbase; /* Buffer for generated bfd symbols */
973 Elf_Internal_Sym i_sym;
974 Elf_External_Sym *x_symp = NULL;
976 /* Read each raw ELF symbol, converting from external ELF form to
977 internal ELF form, and then using the information to create a
978 canonical bfd symbol table entry.
980 Note that we allocate the initial bfd canonical symbol buffer
981 based on a one-to-one mapping of the ELF symbols to canonical
982 symbols. We actually use all the ELF symbols, so there will be no
983 space left over at the end. When we have all the symbols, we
984 build the caller's pointer vector. */
987 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
989 hdr = &elf_tdata (abfd)->symtab_hdr;
990 if (bfd_seek (abfd, hdr->sh_offset, SEEK_SET) == -1)
993 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
996 sym = symbase = NULL;
1001 if (bfd_seek (abfd, hdr->sh_offset, SEEK_SET) == -1)
1004 symbase = ((elf_symbol_type *)
1005 bfd_zalloc (abfd, symcount * sizeof (elf_symbol_type)));
1006 if (symbase == (elf_symbol_type *) NULL)
1010 /* Temporarily allocate room for the raw ELF symbols. */
1011 x_symp = ((Elf_External_Sym *)
1012 bfd_malloc (symcount * sizeof (Elf_External_Sym)));
1013 if (x_symp == NULL && symcount != 0)
1016 if (bfd_read ((PTR) x_symp, sizeof (Elf_External_Sym), symcount, abfd)
1017 != symcount * sizeof (Elf_External_Sym))
1019 /* Skip first symbol, which is a null dummy. */
1020 for (i = 1; i < symcount; i++)
1022 elf_swap_symbol_in (abfd, x_symp + i, &i_sym);
1023 memcpy (&sym->internal_elf_sym, &i_sym, sizeof (Elf_Internal_Sym));
1024 #ifdef ELF_KEEP_EXTSYM
1025 memcpy (&sym->native_elf_sym, x_symp + i, sizeof (Elf_External_Sym));
1027 sym->symbol.the_bfd = abfd;
1029 sym->symbol.name = bfd_elf_string_from_elf_section (abfd,
1033 sym->symbol.value = i_sym.st_value;
1035 if (i_sym.st_shndx > 0 && i_sym.st_shndx < SHN_LORESERVE)
1037 sym->symbol.section = section_from_elf_index (abfd,
1039 if (sym->symbol.section == NULL)
1041 /* This symbol is in a section for which we did not
1042 create a BFD section. Just use bfd_abs_section,
1043 although it is wrong. FIXME. */
1044 sym->symbol.section = bfd_abs_section_ptr;
1047 else if (i_sym.st_shndx == SHN_ABS)
1049 sym->symbol.section = bfd_abs_section_ptr;
1051 else if (i_sym.st_shndx == SHN_COMMON)
1053 sym->symbol.section = bfd_com_section_ptr;
1054 /* Elf puts the alignment into the `value' field, and
1055 the size into the `size' field. BFD wants to see the
1056 size in the value field, and doesn't care (at the
1057 moment) about the alignment. */
1058 sym->symbol.value = i_sym.st_size;
1060 else if (i_sym.st_shndx == SHN_UNDEF)
1062 sym->symbol.section = bfd_und_section_ptr;
1065 sym->symbol.section = bfd_abs_section_ptr;
1067 sym->symbol.value -= sym->symbol.section->vma;
1069 switch (ELF_ST_BIND (i_sym.st_info))
1072 sym->symbol.flags |= BSF_LOCAL;
1075 if (i_sym.st_shndx != SHN_UNDEF
1076 && i_sym.st_shndx != SHN_COMMON)
1077 sym->symbol.flags |= BSF_GLOBAL;
1080 sym->symbol.flags |= BSF_WEAK;
1084 switch (ELF_ST_TYPE (i_sym.st_info))
1087 sym->symbol.flags |= BSF_SECTION_SYM | BSF_DEBUGGING;
1090 sym->symbol.flags |= BSF_FILE | BSF_DEBUGGING;
1093 sym->symbol.flags |= BSF_FUNCTION;
1096 sym->symbol.flags |= BSF_OBJECT;
1101 sym->symbol.flags |= BSF_DYNAMIC;
1103 /* Do some backend-specific processing on this symbol. */
1105 struct elf_backend_data *ebd = get_elf_backend_data (abfd);
1106 if (ebd->elf_backend_symbol_processing)
1107 (*ebd->elf_backend_symbol_processing) (abfd, &sym->symbol);
1114 /* Do some backend-specific processing on this symbol table. */
1116 struct elf_backend_data *ebd = get_elf_backend_data (abfd);
1117 if (ebd->elf_backend_symbol_table_processing)
1118 (*ebd->elf_backend_symbol_table_processing) (abfd, symbase, symcount);
1121 /* We rely on the zalloc to clear out the final symbol entry. */
1123 symcount = sym - symbase;
1125 /* Fill in the user's symbol pointer vector if needed. */
1133 *symptrs++ = &sym->symbol;
1136 *symptrs = 0; /* Final null pointer */
1148 /* Read in and swap the external relocs. */
1151 elf_slurp_reloc_table (abfd, asect, symbols)
1156 struct elf_backend_data * const ebd = get_elf_backend_data (abfd);
1157 struct bfd_elf_section_data * const d = elf_section_data (asect);
1158 PTR allocated = NULL;
1159 bfd_byte *native_relocs;
1165 if (asect->relocation != NULL
1166 || (asect->flags & SEC_RELOC) == 0
1167 || asect->reloc_count == 0)
1170 BFD_ASSERT (asect->rel_filepos == d->rel_hdr.sh_offset
1171 && (asect->reloc_count
1172 == d->rel_hdr.sh_size / d->rel_hdr.sh_entsize));
1174 allocated = (PTR) bfd_malloc ((size_t) d->rel_hdr.sh_size);
1175 if (allocated == NULL)
1178 if (bfd_seek (abfd, asect->rel_filepos, SEEK_SET) != 0
1179 || (bfd_read (allocated, 1, d->rel_hdr.sh_size, abfd)
1180 != d->rel_hdr.sh_size))
1183 native_relocs = (bfd_byte *) allocated;
1185 relents = ((arelent *)
1186 bfd_alloc (abfd, asect->reloc_count * sizeof (arelent)));
1187 if (relents == NULL)
1190 entsize = d->rel_hdr.sh_entsize;
1191 BFD_ASSERT (entsize == sizeof (Elf_External_Rel)
1192 || entsize == sizeof (Elf_External_Rela));
1194 for (i = 0, relent = relents;
1195 i < asect->reloc_count;
1196 i++, relent++, native_relocs += entsize)
1198 Elf_Internal_Rela rela;
1199 Elf_Internal_Rel rel;
1201 if (entsize == sizeof (Elf_External_Rela))
1202 elf_swap_reloca_in (abfd, (Elf_External_Rela *) native_relocs, &rela);
1205 elf_swap_reloc_in (abfd, (Elf_External_Rel *) native_relocs, &rel);
1206 rela.r_offset = rel.r_offset;
1207 rela.r_info = rel.r_info;
1211 /* The address of an ELF reloc is section relative for an object
1212 file, and absolute for an executable file or shared library.
1213 The address of a BFD reloc is always section relative. */
1214 if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0)
1215 relent->address = rela.r_offset;
1217 relent->address = rela.r_offset - asect->vma;
1219 if (ELF_R_SYM (rela.r_info) == 0)
1220 relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
1225 ps = symbols + ELF_R_SYM (rela.r_info) - 1;
1228 /* Canonicalize ELF section symbols. FIXME: Why? */
1229 if ((s->flags & BSF_SECTION_SYM) == 0)
1230 relent->sym_ptr_ptr = ps;
1232 relent->sym_ptr_ptr = s->section->symbol_ptr_ptr;
1235 relent->addend = rela.r_addend;
1237 if (entsize == sizeof (Elf_External_Rela))
1238 (*ebd->elf_info_to_howto) (abfd, relent, &rela);
1240 (*ebd->elf_info_to_howto_rel) (abfd, relent, &rel);
1243 asect->relocation = relents;
1245 if (allocated != NULL)
1251 if (allocated != NULL)
1258 elf_debug_section (num, hdr)
1260 Elf_Internal_Shdr *hdr;
1262 fprintf (stderr, "\nSection#%d '%s' 0x%.8lx\n", num,
1263 hdr->bfd_section != NULL ? hdr->bfd_section->name : "",
1266 "sh_name = %ld\tsh_type = %ld\tsh_flags = %ld\n",
1267 (long) hdr->sh_name,
1268 (long) hdr->sh_type,
1269 (long) hdr->sh_flags);
1271 "sh_addr = %ld\tsh_offset = %ld\tsh_size = %ld\n",
1272 (long) hdr->sh_addr,
1273 (long) hdr->sh_offset,
1274 (long) hdr->sh_size);
1276 "sh_link = %ld\tsh_info = %ld\tsh_addralign = %ld\n",
1277 (long) hdr->sh_link,
1278 (long) hdr->sh_info,
1279 (long) hdr->sh_addralign);
1280 fprintf (stderr, "sh_entsize = %ld\n",
1281 (long) hdr->sh_entsize);
1286 elf_debug_file (ehdrp)
1287 Elf_Internal_Ehdr *ehdrp;
1289 fprintf (stderr, "e_entry = 0x%.8lx\n", (long) ehdrp->e_entry);
1290 fprintf (stderr, "e_phoff = %ld\n", (long) ehdrp->e_phoff);
1291 fprintf (stderr, "e_phnum = %ld\n", (long) ehdrp->e_phnum);
1292 fprintf (stderr, "e_phentsize = %ld\n", (long) ehdrp->e_phentsize);
1293 fprintf (stderr, "e_shoff = %ld\n", (long) ehdrp->e_shoff);
1294 fprintf (stderr, "e_shnum = %ld\n", (long) ehdrp->e_shnum);
1295 fprintf (stderr, "e_shentsize = %ld\n", (long) ehdrp->e_shentsize);
1299 elf_symbol_flags (flags)
1302 static char buffer[1024];
1305 if (flags & BSF_LOCAL)
1306 strcat (buffer, " local");
1308 if (flags & BSF_GLOBAL)
1309 strcat (buffer, " global");
1311 if (flags & BSF_DEBUGGING)
1312 strcat (buffer, " debug");
1314 if (flags & BSF_FUNCTION)
1315 strcat (buffer, " function");
1317 if (flags & BSF_KEEP)
1318 strcat (buffer, " keep");
1320 if (flags & BSF_KEEP_G)
1321 strcat (buffer, " keep_g");
1323 if (flags & BSF_WEAK)
1324 strcat (buffer, " weak");
1326 if (flags & BSF_SECTION_SYM)
1327 strcat (buffer, " section-sym");
1329 if (flags & BSF_OLD_COMMON)
1330 strcat (buffer, " old-common");
1332 if (flags & BSF_NOT_AT_END)
1333 strcat (buffer, " not-at-end");
1335 if (flags & BSF_CONSTRUCTOR)
1336 strcat (buffer, " constructor");
1338 if (flags & BSF_WARNING)
1339 strcat (buffer, " warning");
1341 if (flags & BSF_INDIRECT)
1342 strcat (buffer, " indirect");
1344 if (flags & BSF_FILE)
1345 strcat (buffer, " file");
1347 if (flags & DYNAMIC)
1348 strcat (buffer, " dynamic");
1350 if (flags & ~(BSF_LOCAL
1365 strcat (buffer, " unknown-bits");
1371 #include "elfcore.h"
1372 #include "elflink.h"
1374 /* Size-dependent data and functions. */
1375 const struct elf_size_info NAME(_bfd_elf,size_info) = {
1376 sizeof (Elf_External_Ehdr),
1377 sizeof (Elf_External_Phdr),
1378 sizeof (Elf_External_Shdr),
1379 sizeof (Elf_External_Rel),
1380 sizeof (Elf_External_Rela),
1381 sizeof (Elf_External_Sym),
1382 sizeof (Elf_External_Dyn),
1383 sizeof (Elf_External_Note),
1385 ARCH_SIZE, FILE_ALIGN,
1386 ELFCLASS, EV_CURRENT,
1388 write_shdrs_and_ehdr,
1390 elf_swap_symbol_out,
1391 elf_slurp_reloc_table,
1392 elf_slurp_symbol_table,