1 /* BFD back-end for binary objects.
2 Copyright (C) 1994-2018 Free Software Foundation, Inc.
3 Written by Ian Lance Taylor, Cygnus Support, <ian@cygnus.com>
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
22 /* This is a BFD backend which may be used to write binary objects.
23 It may only be used for output, not input. The intention is that
24 this may be used as an output format for objcopy in order to
25 generate raw binary data.
27 This is very simple. The only complication is that the real data
28 will start at some address X, and in some cases we will not want to
29 include X zeroes just to get to that point. Since the start
30 address is not meaningful for this object file format, we use it
31 instead to indicate the number of zeroes to skip at the start of
32 the file. objcopy cooperates by specially setting the start
33 address to zero by default. */
37 #include "safe-ctype.h"
40 /* Any bfd we create by reading a binary file has three symbols:
41 a start symbol, an end symbol, and an absolute length symbol. */
44 /* Create a binary object. Invoked via bfd_set_format. */
47 binary_mkobject (bfd *abfd ATTRIBUTE_UNUSED)
52 /* Any file may be considered to be a binary file, provided the target
53 was not defaulted. That is, it must be explicitly specified as
56 static const bfd_target *
57 binary_object_p (bfd *abfd)
63 if (abfd->target_defaulted)
65 bfd_set_error (bfd_error_wrong_format);
69 abfd->symcount = BIN_SYMS;
71 /* Find the file size. */
72 if (bfd_stat (abfd, &statbuf) < 0)
74 bfd_set_error (bfd_error_system_call);
78 /* One data section. */
79 flags = SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_HAS_CONTENTS;
80 sec = bfd_make_section_with_flags (abfd, ".data", flags);
84 sec->size = statbuf.st_size;
87 abfd->tdata.any = (void *) sec;
92 #define binary_close_and_cleanup _bfd_generic_close_and_cleanup
93 #define binary_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
94 #define binary_new_section_hook _bfd_generic_new_section_hook
96 /* Get contents of the only section. */
99 binary_get_section_contents (bfd *abfd,
100 asection *section ATTRIBUTE_UNUSED,
105 if (bfd_seek (abfd, offset, SEEK_SET) != 0
106 || bfd_bread (location, count, abfd) != count)
111 /* Return the amount of memory needed to read the symbol table. */
114 binary_get_symtab_upper_bound (bfd *abfd ATTRIBUTE_UNUSED)
116 return (BIN_SYMS + 1) * sizeof (asymbol *);
119 /* Create a symbol name based on the bfd's filename. */
122 mangle_name (bfd *abfd, char *suffix)
128 size = (strlen (bfd_get_filename (abfd))
130 + sizeof "_binary__");
132 buf = (char *) bfd_alloc (abfd, size);
136 sprintf (buf, "_binary_%s_%s", bfd_get_filename (abfd), suffix);
138 /* Change any non-alphanumeric characters to underscores. */
139 for (p = buf; *p; p++)
146 /* Return the symbol table. */
149 binary_canonicalize_symtab (bfd *abfd, asymbol **alocation)
151 asection *sec = (asection *) abfd->tdata.any;
154 bfd_size_type amt = BIN_SYMS * sizeof (asymbol);
156 syms = (asymbol *) bfd_alloc (abfd, amt);
161 syms[0].the_bfd = abfd;
162 syms[0].name = mangle_name (abfd, "start");
164 syms[0].flags = BSF_GLOBAL;
165 syms[0].section = sec;
166 syms[0].udata.p = NULL;
169 syms[1].the_bfd = abfd;
170 syms[1].name = mangle_name (abfd, "end");
171 syms[1].value = sec->size;
172 syms[1].flags = BSF_GLOBAL;
173 syms[1].section = sec;
174 syms[1].udata.p = NULL;
177 syms[2].the_bfd = abfd;
178 syms[2].name = mangle_name (abfd, "size");
179 syms[2].value = sec->size;
180 syms[2].flags = BSF_GLOBAL;
181 syms[2].section = bfd_abs_section_ptr;
182 syms[2].udata.p = NULL;
184 for (i = 0; i < BIN_SYMS; i++)
185 *alocation++ = syms++;
191 #define binary_make_empty_symbol _bfd_generic_make_empty_symbol
192 #define binary_print_symbol _bfd_nosymbols_print_symbol
193 #define binary_get_symbol_version_string \
194 _bfd_nosymbols_get_symbol_version_string
196 /* Get information about a symbol. */
199 binary_get_symbol_info (bfd *ignore_abfd ATTRIBUTE_UNUSED,
203 bfd_symbol_info (symbol, ret);
206 #define binary_bfd_is_local_label_name bfd_generic_is_local_label_name
207 #define binary_get_lineno _bfd_nosymbols_get_lineno
208 #define binary_find_nearest_line _bfd_nosymbols_find_nearest_line
209 #define binary_find_line _bfd_nosymbols_find_line
210 #define binary_find_inliner_info _bfd_nosymbols_find_inliner_info
211 #define binary_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
212 #define binary_read_minisymbols _bfd_generic_read_minisymbols
213 #define binary_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
214 #define binary_bfd_is_target_special_symbol ((bfd_boolean (*) (bfd *, asymbol *)) (bfd_boolean (*)) bfd_false)
216 /* Set the architecture of a binary file. */
217 #define binary_set_arch_mach _bfd_generic_set_arch_mach
219 /* Write section contents of a binary file. */
222 binary_set_section_contents (bfd *abfd,
231 if (! abfd->output_has_begun)
234 bfd_boolean found_low;
238 /* The lowest section LMA sets the virtual address of the start
239 of the file. We use this to set the file position of all the
243 for (s = abfd->sections; s != NULL; s = s->next)
245 & (SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC | SEC_NEVER_LOAD))
246 == (SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC))
248 && (! found_low || s->lma < low))
254 opb = bfd_octets_per_byte (abfd);
255 for (s = abfd->sections; s != NULL; s = s->next)
257 s->filepos = (s->lma - low) * opb;
259 /* Skip following warning check for sections that will not
260 occupy file space. */
262 & (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_NEVER_LOAD))
263 != (SEC_HAS_CONTENTS | SEC_ALLOC)
267 /* If attempting to generate a binary file from a bfd with
268 LMA's all over the place, huge (sparse?) binary files may
269 result. This condition attempts to detect this situation
270 and print a warning. Better heuristics would be nice to
275 /* xgettext:c-format */
276 (_("warning: writing section `%A' at huge (ie negative) "
281 abfd->output_has_begun = TRUE;
284 /* We don't want to output anything for a section that is neither
285 loaded nor allocated. The contents of such a section are not
286 meaningful in the binary format. */
287 if ((sec->flags & (SEC_LOAD | SEC_ALLOC)) == 0)
289 if ((sec->flags & SEC_NEVER_LOAD) != 0)
292 return _bfd_generic_set_section_contents (abfd, sec, data, offset, size);
295 /* No space is required for header information. */
298 binary_sizeof_headers (bfd *abfd ATTRIBUTE_UNUSED,
299 struct bfd_link_info *info ATTRIBUTE_UNUSED)
304 #define binary_bfd_get_relocated_section_contents bfd_generic_get_relocated_section_contents
305 #define binary_bfd_relax_section bfd_generic_relax_section
306 #define binary_bfd_gc_sections bfd_generic_gc_sections
307 #define binary_bfd_lookup_section_flags bfd_generic_lookup_section_flags
308 #define binary_bfd_merge_sections bfd_generic_merge_sections
309 #define binary_bfd_is_group_section bfd_generic_is_group_section
310 #define binary_bfd_discard_group bfd_generic_discard_group
311 #define binary_section_already_linked _bfd_generic_section_already_linked
312 #define binary_bfd_define_common_symbol bfd_generic_define_common_symbol
313 #define binary_bfd_define_start_stop bfd_generic_define_start_stop
314 #define binary_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
315 #define binary_bfd_link_just_syms _bfd_generic_link_just_syms
316 #define binary_bfd_copy_link_hash_symbol_type _bfd_generic_copy_link_hash_symbol_type
317 #define binary_bfd_link_add_symbols _bfd_generic_link_add_symbols
318 #define binary_bfd_final_link _bfd_generic_final_link
319 #define binary_bfd_link_split_section _bfd_generic_link_split_section
320 #define binary_get_section_contents_in_window _bfd_generic_get_section_contents_in_window
321 #define binary_bfd_link_check_relocs _bfd_generic_link_check_relocs
323 const bfd_target binary_vec =
326 bfd_target_unknown_flavour, /* flavour */
327 BFD_ENDIAN_UNKNOWN, /* byteorder */
328 BFD_ENDIAN_UNKNOWN, /* header_byteorder */
329 EXEC_P, /* object_flags */
330 (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE | SEC_DATA
331 | SEC_ROM | SEC_HAS_CONTENTS), /* section_flags */
332 0, /* symbol_leading_char */
333 ' ', /* ar_pad_char */
334 16, /* ar_max_namelen */
335 255, /* match priority. */
336 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
337 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
338 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */
339 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
340 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
341 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
342 { /* bfd_check_format */
348 { /* bfd_set_format */
354 { /* bfd_write_contents */
361 BFD_JUMP_TABLE_GENERIC (binary),
362 BFD_JUMP_TABLE_COPY (_bfd_generic),
363 BFD_JUMP_TABLE_CORE (_bfd_nocore),
364 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
365 BFD_JUMP_TABLE_SYMBOLS (binary),
366 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
367 BFD_JUMP_TABLE_WRITE (binary),
368 BFD_JUMP_TABLE_LINK (binary),
369 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),