1 /* BFD back-end for binary objects.
2 Copyright 1994, 95, 96, 97, 1998 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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 /* This is a BFD backend which may be used to write binary objects.
22 It may only be used for output, not input. The intention is that
23 this may be used as an output format for objcopy in order to
24 generate raw binary data.
26 This is very simple. The only complication is that the real data
27 will start at some address X, and in some cases we will not want to
28 include X zeroes just to get to that point. Since the start
29 address is not meaningful for this object file format, we use it
30 instead to indicate the number of zeroes to skip at the start of
31 the file. objcopy cooperates by specially setting the start
32 address to zero by default. */
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 static boolean binary_mkobject PARAMS ((bfd *));
45 static const bfd_target *binary_object_p PARAMS ((bfd *));
46 static boolean binary_get_section_contents
47 PARAMS ((bfd *, asection *, PTR, file_ptr, bfd_size_type));
48 static long binary_get_symtab_upper_bound PARAMS ((bfd *));
49 static char *mangle_name PARAMS ((bfd *, char *));
50 static long binary_get_symtab PARAMS ((bfd *, asymbol **));
51 static asymbol *binary_make_empty_symbol PARAMS ((bfd *));
52 static void binary_get_symbol_info PARAMS ((bfd *, asymbol *, symbol_info *));
53 static boolean binary_set_section_contents
54 PARAMS ((bfd *, asection *, PTR, file_ptr, bfd_size_type));
55 static int binary_sizeof_headers PARAMS ((bfd *, boolean));
57 /* Create a binary object. Invoked via bfd_set_format. */
60 binary_mkobject (abfd)
66 /* Any file may be considered to be a binary file, provided the target
67 was not defaulted. That is, it must be explicitly specified as
70 static const bfd_target *
71 binary_object_p (abfd)
77 if (abfd->target_defaulted)
79 bfd_set_error (bfd_error_wrong_format);
83 abfd->symcount = BIN_SYMS;
85 /* Find the file size. */
86 if (bfd_stat (abfd, &statbuf) < 0)
88 bfd_set_error (bfd_error_system_call);
92 /* One data section. */
93 sec = bfd_make_section (abfd, ".data");
96 sec->flags = SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_HAS_CONTENTS;
98 sec->_raw_size = statbuf.st_size;
101 abfd->tdata.any = (PTR) sec;
106 #define binary_close_and_cleanup _bfd_generic_close_and_cleanup
107 #define binary_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
108 #define binary_new_section_hook _bfd_generic_new_section_hook
110 /* Get contents of the only section. */
113 binary_get_section_contents (abfd, section, location, offset, count)
120 if (bfd_seek (abfd, offset, SEEK_SET) != 0
121 || bfd_read (location, 1, count, abfd) != count)
126 /* Return the amount of memory needed to read the symbol table. */
129 binary_get_symtab_upper_bound (abfd)
132 return (BIN_SYMS + 1) * sizeof (asymbol *);
135 /* Create a symbol name based on the bfd's filename. */
138 mangle_name (abfd, suffix)
146 size = (strlen (bfd_get_filename (abfd))
148 + sizeof "_binary__");
150 buf = (char *) bfd_alloc (abfd, size);
154 sprintf (buf, "_binary_%s_%s", bfd_get_filename (abfd), suffix);
156 /* Change any non-alphanumeric characters to underscores. */
157 for (p = buf; *p; p++)
158 if (! isalnum ((unsigned char) *p))
164 /* Return the symbol table. */
167 binary_get_symtab (abfd, alocation)
171 asection *sec = (asection *) abfd->tdata.any;
175 syms = (asymbol *) bfd_alloc (abfd, BIN_SYMS * sizeof (asymbol));
180 syms[0].the_bfd = abfd;
181 syms[0].name = mangle_name (abfd, "start");
183 syms[0].flags = BSF_GLOBAL;
184 syms[0].section = sec;
185 syms[0].udata.p = NULL;
188 syms[1].the_bfd = abfd;
189 syms[1].name = mangle_name (abfd, "end");
190 syms[1].value = sec->_raw_size;
191 syms[1].flags = BSF_GLOBAL;
192 syms[1].section = sec;
193 syms[1].udata.p = NULL;
196 syms[2].the_bfd = abfd;
197 syms[2].name = mangle_name (abfd, "size");
198 syms[2].value = sec->_raw_size;
199 syms[2].flags = BSF_GLOBAL;
200 syms[2].section = bfd_abs_section_ptr;
201 syms[2].udata.p = NULL;
203 for (i = 0; i < BIN_SYMS; i++)
204 *alocation++ = syms++;
210 /* Make an empty symbol. */
213 binary_make_empty_symbol (abfd)
216 return (asymbol *) bfd_alloc (abfd, sizeof (asymbol));
219 #define binary_print_symbol _bfd_nosymbols_print_symbol
221 /* Get information about a symbol. */
224 binary_get_symbol_info (ignore_abfd, symbol, ret)
229 bfd_symbol_info (symbol, ret);
232 #define binary_bfd_is_local_label_name bfd_generic_is_local_label_name
233 #define binary_get_lineno _bfd_nosymbols_get_lineno
234 #define binary_find_nearest_line _bfd_nosymbols_find_nearest_line
235 #define binary_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
236 #define binary_read_minisymbols _bfd_generic_read_minisymbols
237 #define binary_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
239 #define binary_get_reloc_upper_bound \
240 ((long (*) PARAMS ((bfd *, asection *))) bfd_0l)
241 #define binary_canonicalize_reloc \
242 ((long (*) PARAMS ((bfd *, asection *, arelent **, asymbol **))) bfd_0l)
243 #define binary_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup
245 /* Set the architecture of a binary file. */
246 #define binary_set_arch_mach _bfd_generic_set_arch_mach
248 /* Write section contents of a binary file. */
251 binary_set_section_contents (abfd, sec, data, offset, size)
258 /* We don't want to output anything for a section that is neither
259 loaded nor allocated. The contents of such a section are not
260 meaningful in the binary format. */
261 if ((sec->flags & (SEC_LOAD | SEC_ALLOC)) == 0)
263 if ((sec->flags & SEC_NEVER_LOAD) != 0)
266 if (! abfd->output_has_begun)
272 /* The lowest section LMA sets the virtual address of the start
273 of the file. We use this to set the file position of all the
277 for (s = abfd->sections; s != NULL; s = s->next)
278 if (((s->flags & (SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC))
279 == (SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC))
280 && (! found_low || s->lma < low))
286 for (s = abfd->sections; s != NULL; s = s->next)
287 s->filepos = s->lma - low;
289 abfd->output_has_begun = true;
292 return _bfd_generic_set_section_contents (abfd, sec, data, offset, size);
295 /* No space is required for header information. */
298 binary_sizeof_headers (abfd, exec)
305 #define binary_bfd_get_relocated_section_contents \
306 bfd_generic_get_relocated_section_contents
307 #define binary_bfd_relax_section bfd_generic_relax_section
308 #define binary_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
309 #define binary_bfd_link_add_symbols _bfd_generic_link_add_symbols
310 #define binary_bfd_final_link _bfd_generic_final_link
311 #define binary_bfd_link_split_section _bfd_generic_link_split_section
312 #define binary_get_section_contents_in_window \
313 _bfd_generic_get_section_contents_in_window
315 const bfd_target binary_vec =
318 bfd_target_unknown_flavour, /* flavour */
319 BFD_ENDIAN_UNKNOWN, /* byteorder */
320 BFD_ENDIAN_UNKNOWN, /* header_byteorder */
321 EXEC_P, /* object_flags */
322 (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE | SEC_DATA
323 | SEC_ROM | SEC_HAS_CONTENTS), /* section_flags */
324 0, /* symbol_leading_char */
325 ' ', /* ar_pad_char */
326 16, /* ar_max_namelen */
327 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
328 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
329 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */
330 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
331 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
332 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
333 { /* bfd_check_format */
335 binary_object_p, /* bfd_check_format */
339 { /* bfd_set_format */
345 { /* bfd_write_contents */
352 BFD_JUMP_TABLE_GENERIC (binary),
353 BFD_JUMP_TABLE_COPY (_bfd_generic),
354 BFD_JUMP_TABLE_CORE (_bfd_nocore),
355 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
356 BFD_JUMP_TABLE_SYMBOLS (binary),
357 BFD_JUMP_TABLE_RELOCS (binary),
358 BFD_JUMP_TABLE_WRITE (binary),
359 BFD_JUMP_TABLE_LINK (binary),
360 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),