diff options
Diffstat (limited to 'bfd/binary.c')
| -rw-r--r-- | bfd/binary.c | 258 |
1 files changed, 229 insertions, 29 deletions
diff --git a/bfd/binary.c b/bfd/binary.c index a429889..1755d4a 100644 --- a/bfd/binary.c +++ b/bfd/binary.c @@ -16,7 +16,7 @@ GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software -Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ +Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* This is a BFD backend which may be used to write binary objects. It may only be used for output, not input. The intention is that @@ -31,14 +31,28 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ the file. objcopy cooperates by specially setting the start address to zero by default. */ +#include <ctype.h> + #include "bfd.h" #include "sysdep.h" #include "libbfd.h" +/* Any bfd we create by reading a binary file has three symbols: + a start symbol, an end symbol, and an absolute length symbol. */ +#define BIN_SYMS 3 + static boolean binary_mkobject PARAMS ((bfd *)); +static const bfd_target *binary_object_p PARAMS ((bfd *)); +static boolean binary_get_section_contents + PARAMS ((bfd *, asection *, PTR, file_ptr, bfd_size_type)); +static long binary_get_symtab_upper_bound PARAMS ((bfd *)); +static char *mangle_name PARAMS ((bfd *, char *)); +static long binary_get_symtab PARAMS ((bfd *, asymbol **)); static asymbol *binary_make_empty_symbol PARAMS ((bfd *)); +static void binary_get_symbol_info PARAMS ((bfd *, asymbol *, symbol_info *)); static boolean binary_set_section_contents PARAMS ((bfd *, asection *, PTR, file_ptr, bfd_size_type)); +static int binary_sizeof_headers PARAMS ((bfd *, boolean)); /* Create a binary object. Invoked via bfd_set_format. */ @@ -49,17 +63,157 @@ binary_mkobject (abfd) return true; } -/* Most of the symbol routines can just return an error. */ -#define binary_get_symtab_upper_bound _bfd_nosymbols_get_symtab_upper_bound -#define binary_get_symtab _bfd_nosymbols_get_symtab -#define binary_print_symbol _bfd_nosymbols_print_symbol -#define binary_get_symbol_info _bfd_nosymbols_get_symbol_info -#define binary_bfd_is_local_label _bfd_nosymbols_bfd_is_local_label -#define binary_get_lineno _bfd_nosymbols_get_lineno -#define binary_find_nearest_line _bfd_nosymbols_find_nearest_line -#define binary_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol +/* Any file may be considered to be a binary file, provided the target + was not defaulted. That is, it must be explicitly specified as + being binary. */ + +static const bfd_target * +binary_object_p (abfd) + bfd *abfd; +{ + struct stat statbuf; + asection *sec; + + if (abfd->target_defaulted) + { + bfd_set_error (bfd_error_wrong_format); + return NULL; + } + + abfd->symcount = BIN_SYMS; + + /* Find the file size. */ + if (bfd_stat (abfd, &statbuf) < 0) + { + bfd_set_error (bfd_error_system_call); + return NULL; + } + + /* One data section. */ + sec = bfd_make_section (abfd, ".data"); + if (sec == NULL) + return NULL; + sec->flags = SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_HAS_CONTENTS; + sec->vma = 0; + sec->_raw_size = statbuf.st_size; + sec->filepos = 0; + + abfd->tdata.any = (PTR) sec; + + return abfd->xvec; +} + +#define binary_close_and_cleanup _bfd_generic_close_and_cleanup +#define binary_bfd_free_cached_info _bfd_generic_bfd_free_cached_info +#define binary_new_section_hook _bfd_generic_new_section_hook + +/* Get contents of the only section. */ + +static boolean +binary_get_section_contents (abfd, section, location, offset, count) + bfd *abfd; + asection *section; + PTR location; + file_ptr offset; + bfd_size_type count; +{ + if (bfd_seek (abfd, offset, SEEK_SET) != 0 + || bfd_read (location, 1, count, abfd) != count) + return false; + return true; +} + +/* Return the amount of memory needed to read the symbol table. */ + +static long +binary_get_symtab_upper_bound (abfd) + bfd *abfd; +{ + return (BIN_SYMS + 1) * sizeof (asymbol *); +} + +/* Create a symbol name based on the bfd's filename. */ + +static char * +mangle_name (abfd, suffix) + bfd *abfd; + char *suffix; +{ + int size; + char *buf; + char *p; + + size = (strlen (bfd_get_filename (abfd)) + + strlen (suffix) + + sizeof "_binary__"); + + buf = (char *) bfd_alloc (abfd, size); + if (buf == NULL) + { + bfd_set_error (bfd_error_no_memory); + return false; + } + + sprintf (buf, "_binary_%s_%s", bfd_get_filename (abfd), suffix); + + /* Change any non-alphanumeric characters to underscores. */ + for (p = buf; *p; p++) + if (! isalnum (*p)) + *p = '_'; + + return buf; +} -/* We do have to provide a routine to make an empty symbol. */ +/* Return the symbol table. */ + +static long +binary_get_symtab (abfd, alocation) + bfd *abfd; + asymbol **alocation; +{ + asection *sec = (asection *) abfd->tdata.any; + asymbol *syms; + unsigned int i; + + syms = (asymbol *) bfd_alloc (abfd, BIN_SYMS * sizeof (asymbol)); + if (syms == NULL) + { + bfd_set_error (bfd_error_no_memory); + return false; + } + + /* Start symbol. */ + syms[0].the_bfd = abfd; + syms[0].name = mangle_name (abfd, "start"); + syms[0].value = 0; + syms[0].flags = BSF_GLOBAL; + syms[0].section = sec; + syms[0].udata.p = NULL; + + /* End symbol. */ + syms[1].the_bfd = abfd; + syms[1].name = mangle_name (abfd, "end"); + syms[1].value = sec->_raw_size; + syms[1].flags = BSF_GLOBAL; + syms[1].section = sec; + syms[1].udata.p = NULL; + + /* Size symbol. */ + syms[2].the_bfd = abfd; + syms[2].name = mangle_name (abfd, "size"); + syms[2].value = sec->_raw_size; + syms[2].flags = BSF_GLOBAL; + syms[2].section = bfd_abs_section_ptr; + syms[2].udata.p = NULL; + + for (i = 0; i < BIN_SYMS; i++) + *alocation++ = syms++; + *alocation = NULL; + + return BIN_SYMS; +} + +/* Make an empty symbol. */ static asymbol * binary_make_empty_symbol (abfd) @@ -73,6 +227,32 @@ binary_make_empty_symbol (abfd) return ret; } +#define binary_print_symbol _bfd_nosymbols_print_symbol + +/* Get information about a symbol. */ + +static void +binary_get_symbol_info (ignore_abfd, symbol, ret) + bfd *ignore_abfd; + asymbol *symbol; + symbol_info *ret; +{ + bfd_symbol_info (symbol, ret); +} + +#define binary_bfd_is_local_label bfd_generic_is_local_label +#define binary_get_lineno _bfd_nosymbols_get_lineno +#define binary_find_nearest_line _bfd_nosymbols_find_nearest_line +#define binary_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol +#define binary_read_minisymbols _bfd_generic_read_minisymbols +#define binary_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol + +#define binary_get_reloc_upper_bound \ + ((long (*) PARAMS ((bfd *, asection *))) bfd_0l) +#define binary_canonicalize_reloc \ + ((long (*) PARAMS ((bfd *, asection *, arelent **, asymbol **))) bfd_0l) +#define binary_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup + /* Set the architecture of a binary file. */ #define binary_set_arch_mach _bfd_generic_set_arch_mach @@ -86,25 +266,46 @@ binary_set_section_contents (abfd, sec, data, offset, size) file_ptr offset; bfd_size_type size; { - /* In a binary file, the file position of a section is just the VMA - minus the start address. */ - sec->filepos = bfd_section_vma (abfd, sec) - bfd_get_start_address (abfd); - - if (sec->filepos + offset < 0) + if (! abfd->output_has_begun) { - file_ptr adjust; - - adjust = - (sec->filepos + offset); - if (size <= adjust) - return true; - size -= adjust; - data = (PTR) ((bfd_byte *) data + adjust); - offset += adjust; + bfd_vma low; + asection *s; + + /* The lowest section VMA sets the virtual address of the start + of the file. We use the set the file position of all the + sections. */ + low = abfd->sections->vma; + for (s = abfd->sections->next; s != NULL; s = s->next) + if (s->vma < low) + low = s->vma; + + for (s = abfd->sections; s != NULL; s = s->next) + s->filepos = s->vma - low; + + abfd->output_has_begun = true; } return _bfd_generic_set_section_contents (abfd, sec, data, offset, size); } +/* No space is required for header information. */ + +static int +binary_sizeof_headers (abfd, exec) + bfd *abfd; + boolean exec; +{ + return 0; +} + +#define binary_bfd_get_relocated_section_contents \ + bfd_generic_get_relocated_section_contents +#define binary_bfd_relax_section bfd_generic_relax_section +#define binary_bfd_link_hash_table_create _bfd_generic_link_hash_table_create +#define binary_bfd_link_add_symbols _bfd_generic_link_add_symbols +#define binary_bfd_final_link _bfd_generic_final_link +#define binary_bfd_link_split_section _bfd_generic_link_split_section + const bfd_target binary_vec = { "binary", /* name */ @@ -117,7 +318,6 @@ const bfd_target binary_vec = 0, /* symbol_leading_char */ ' ', /* ar_pad_char */ 16, /* ar_max_namelen */ - 1, /* align_power_min */ bfd_getb64, bfd_getb_signed_64, bfd_putb64, bfd_getb32, bfd_getb_signed_32, bfd_putb32, bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */ @@ -126,7 +326,7 @@ const bfd_target binary_vec = bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */ { /* bfd_check_format */ _bfd_dummy_target, - _bfd_dummy_target, + binary_object_p, /* bfd_check_format */ _bfd_dummy_target, _bfd_dummy_target, }, @@ -143,14 +343,14 @@ const bfd_target binary_vec = bfd_false, }, - BFD_JUMP_TABLE_GENERIC (_bfd_generic), + BFD_JUMP_TABLE_GENERIC (binary), BFD_JUMP_TABLE_COPY (_bfd_generic), BFD_JUMP_TABLE_CORE (_bfd_nocore), BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), BFD_JUMP_TABLE_SYMBOLS (binary), - BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), + BFD_JUMP_TABLE_RELOCS (binary), BFD_JUMP_TABLE_WRITE (binary), - BFD_JUMP_TABLE_LINK (_bfd_nolink), + BFD_JUMP_TABLE_LINK (binary), BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), NULL |