1 /* BFD back-end for binary objects.
2 Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000
3 Free Software Foundation, Inc.
4 Written by Ian Lance Taylor, Cygnus Support, <ian@cygnus.com>
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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. */
41 /* Any bfd we create by reading a binary file has three symbols:
42 a start symbol, an end symbol, and an absolute length symbol. */
45 static boolean binary_mkobject PARAMS ((bfd *));
46 static const bfd_target *binary_object_p PARAMS ((bfd *));
47 static boolean binary_get_section_contents
48 PARAMS ((bfd *, asection *, PTR, file_ptr, bfd_size_type));
49 static long binary_get_symtab_upper_bound PARAMS ((bfd *));
50 static char *mangle_name PARAMS ((bfd *, char *));
51 static long binary_get_symtab PARAMS ((bfd *, asymbol **));
52 static asymbol *binary_make_empty_symbol PARAMS ((bfd *));
53 static void binary_get_symbol_info PARAMS ((bfd *, asymbol *, symbol_info *));
54 static boolean binary_set_section_contents
55 PARAMS ((bfd *, asection *, PTR, file_ptr, bfd_size_type));
56 static int binary_sizeof_headers PARAMS ((bfd *, boolean));
58 /* Create a binary object. Invoked via bfd_set_format. */
61 binary_mkobject (abfd)
62 bfd *abfd ATTRIBUTE_UNUSED;
67 /* Any file may be considered to be a binary file, provided the target
68 was not defaulted. That is, it must be explicitly specified as
71 static const bfd_target *
72 binary_object_p (abfd)
78 if (abfd->target_defaulted)
80 bfd_set_error (bfd_error_wrong_format);
84 abfd->symcount = BIN_SYMS;
86 /* Find the file size. */
87 if (bfd_stat (abfd, &statbuf) < 0)
89 bfd_set_error (bfd_error_system_call);
93 /* One data section. */
94 sec = bfd_make_section (abfd, ".data");
97 sec->flags = SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_HAS_CONTENTS;
99 sec->_raw_size = statbuf.st_size;
102 abfd->tdata.any = (PTR) sec;
107 #define binary_close_and_cleanup _bfd_generic_close_and_cleanup
108 #define binary_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
109 #define binary_new_section_hook _bfd_generic_new_section_hook
111 /* Get contents of the only section. */
114 binary_get_section_contents (abfd, section, location, offset, count)
116 asection *section ATTRIBUTE_UNUSED;
121 if (bfd_seek (abfd, offset, SEEK_SET) != 0
122 || bfd_read (location, 1, count, abfd) != count)
127 /* Return the amount of memory needed to read the symbol table. */
130 binary_get_symtab_upper_bound (abfd)
131 bfd *abfd ATTRIBUTE_UNUSED;
133 return (BIN_SYMS + 1) * sizeof (asymbol *);
136 /* Create a symbol name based on the bfd's filename. */
139 mangle_name (abfd, suffix)
147 size = (strlen (bfd_get_filename (abfd))
149 + sizeof "_binary__");
151 buf = (char *) bfd_alloc (abfd, size);
155 sprintf (buf, "_binary_%s_%s", bfd_get_filename (abfd), suffix);
157 /* Change any non-alphanumeric characters to underscores. */
158 for (p = buf; *p; p++)
159 if (! isalnum ((unsigned char) *p))
165 /* Return the symbol table. */
168 binary_get_symtab (abfd, alocation)
172 asection *sec = (asection *) abfd->tdata.any;
176 syms = (asymbol *) bfd_alloc (abfd, BIN_SYMS * sizeof (asymbol));
181 syms[0].the_bfd = abfd;
182 syms[0].name = mangle_name (abfd, "start");
184 syms[0].flags = BSF_GLOBAL;
185 syms[0].section = sec;
186 syms[0].udata.p = NULL;
189 syms[1].the_bfd = abfd;
190 syms[1].name = mangle_name (abfd, "end");
191 syms[1].value = sec->_raw_size;
192 syms[1].flags = BSF_GLOBAL;
193 syms[1].section = sec;
194 syms[1].udata.p = NULL;
197 syms[2].the_bfd = abfd;
198 syms[2].name = mangle_name (abfd, "size");
199 syms[2].value = sec->_raw_size;
200 syms[2].flags = BSF_GLOBAL;
201 syms[2].section = bfd_abs_section_ptr;
202 syms[2].udata.p = NULL;
204 for (i = 0; i < BIN_SYMS; i++)
205 *alocation++ = syms++;
211 /* Make an empty symbol. */
214 binary_make_empty_symbol (abfd)
217 return (asymbol *) bfd_alloc (abfd, sizeof (asymbol));
220 #define binary_print_symbol _bfd_nosymbols_print_symbol
222 /* Get information about a symbol. */
225 binary_get_symbol_info (ignore_abfd, symbol, ret)
226 bfd *ignore_abfd ATTRIBUTE_UNUSED;
230 bfd_symbol_info (symbol, ret);
233 #define binary_bfd_is_local_label_name bfd_generic_is_local_label_name
234 #define binary_get_lineno _bfd_nosymbols_get_lineno
235 #define binary_find_nearest_line _bfd_nosymbols_find_nearest_line
236 #define binary_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
237 #define binary_read_minisymbols _bfd_generic_read_minisymbols
238 #define binary_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
240 #define binary_get_reloc_upper_bound \
241 ((long (*) PARAMS ((bfd *, asection *))) bfd_0l)
242 #define binary_canonicalize_reloc \
243 ((long (*) PARAMS ((bfd *, asection *, arelent **, asymbol **))) bfd_0l)
244 #define binary_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup
246 /* Set the architecture of a binary file. */
247 #define binary_set_arch_mach _bfd_generic_set_arch_mach
249 /* Write section contents of a binary file. */
252 binary_set_section_contents (abfd, sec, data, offset, size)
262 if (! abfd->output_has_begun)
268 /* The lowest section LMA sets the virtual address of the start
269 of the file. We use this to set the file position of all the
273 for (s = abfd->sections; s != NULL; s = s->next)
275 & (SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC | SEC_NEVER_LOAD))
276 == (SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC))
277 && (s->_raw_size > 0)
278 && (! found_low || s->lma < low))
284 for (s = abfd->sections; s != NULL; s = s->next)
286 s->filepos = s->lma - low;
288 /* Skip following warning check for sections that will not
289 occupy file space. */
291 & (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_NEVER_LOAD))
292 != (SEC_HAS_CONTENTS | SEC_ALLOC)
293 || (s->_raw_size == 0))
296 /* If attempting to generate a binary file from a bfd with
297 LMA's all over the place, huge (sparse?) binary files may
298 result. This condition attempts to detect this situation
299 and print a warning. Better heuristics would be nice to
303 (*_bfd_error_handler)
304 (_("Warning: Writing section `%s' to huge (ie negative) file offset 0x%lx."),
305 bfd_get_section_name (abfd, s),
306 (unsigned long) s->filepos);
309 abfd->output_has_begun = true;
312 /* We don't want to output anything for a section that is neither
313 loaded nor allocated. The contents of such a section are not
314 meaningful in the binary format. */
315 if ((sec->flags & (SEC_LOAD | SEC_ALLOC)) == 0)
317 if ((sec->flags & SEC_NEVER_LOAD) != 0)
320 return _bfd_generic_set_section_contents (abfd, sec, data, offset, size);
323 /* No space is required for header information. */
326 binary_sizeof_headers (abfd, exec)
327 bfd *abfd ATTRIBUTE_UNUSED;
328 boolean exec ATTRIBUTE_UNUSED;
333 #define binary_bfd_get_relocated_section_contents \
334 bfd_generic_get_relocated_section_contents
335 #define binary_bfd_relax_section bfd_generic_relax_section
336 #define binary_bfd_gc_sections bfd_generic_gc_sections
337 #define binary_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
338 #define binary_bfd_link_add_symbols _bfd_generic_link_add_symbols
339 #define binary_bfd_final_link _bfd_generic_final_link
340 #define binary_bfd_link_split_section _bfd_generic_link_split_section
341 #define binary_get_section_contents_in_window \
342 _bfd_generic_get_section_contents_in_window
344 const bfd_target binary_vec =
347 bfd_target_unknown_flavour, /* flavour */
348 BFD_ENDIAN_UNKNOWN, /* byteorder */
349 BFD_ENDIAN_UNKNOWN, /* header_byteorder */
350 EXEC_P, /* object_flags */
351 (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE | SEC_DATA
352 | SEC_ROM | SEC_HAS_CONTENTS), /* section_flags */
353 0, /* symbol_leading_char */
354 ' ', /* ar_pad_char */
355 16, /* ar_max_namelen */
356 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
357 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
358 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */
359 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
360 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
361 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
362 { /* bfd_check_format */
364 binary_object_p, /* bfd_check_format */
368 { /* bfd_set_format */
374 { /* bfd_write_contents */
381 BFD_JUMP_TABLE_GENERIC (binary),
382 BFD_JUMP_TABLE_COPY (_bfd_generic),
383 BFD_JUMP_TABLE_CORE (_bfd_nocore),
384 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
385 BFD_JUMP_TABLE_SYMBOLS (binary),
386 BFD_JUMP_TABLE_RELOCS (binary),
387 BFD_JUMP_TABLE_WRITE (binary),
388 BFD_JUMP_TABLE_LINK (binary),
389 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),