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Diffstat (limited to 'bfd/binary.c')
| -rw-r--r-- | bfd/binary.c | 386 |
1 files changed, 386 insertions, 0 deletions
diff --git a/bfd/binary.c b/bfd/binary.c new file mode 100644 index 0000000..6c63fff --- /dev/null +++ b/bfd/binary.c @@ -0,0 +1,386 @@ +/* BFD back-end for binary objects. + Copyright 1994, 95, 96, 97, 98, 1999 Free Software Foundation, Inc. + Written by Ian Lance Taylor, Cygnus Support, <ian@cygnus.com> + +This file is part of BFD, the Binary File Descriptor library. + +This program is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +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., 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 + this may be used as an output format for objcopy in order to + generate raw binary data. + + This is very simple. The only complication is that the real data + will start at some address X, and in some cases we will not want to + include X zeroes just to get to that point. Since the start + address is not meaningful for this object file format, we use it + instead to indicate the number of zeroes to skip at the start of + 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. */ + +static boolean +binary_mkobject (abfd) + bfd *abfd; +{ + return true; +} + +/* 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) + return ""; + + sprintf (buf, "_binary_%s_%s", bfd_get_filename (abfd), suffix); + + /* Change any non-alphanumeric characters to underscores. */ + for (p = buf; *p; p++) + if (! isalnum ((unsigned char) *p)) + *p = '_'; + + return buf; +} + +/* 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) + 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) + bfd *abfd; +{ + return (asymbol *) bfd_alloc (abfd, sizeof (asymbol)); +} + +#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_name bfd_generic_is_local_label_name +#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 + +/* Write section contents of a binary file. */ + +static boolean +binary_set_section_contents (abfd, sec, data, offset, size) + bfd *abfd; + asection *sec; + PTR data; + file_ptr offset; + bfd_size_type size; +{ + if (! abfd->output_has_begun) + { + boolean found_low; + bfd_vma low; + asection *s; + + /* The lowest section LMA sets the virtual address of the start + of the file. We use this to set the file position of all the + sections. */ + found_low = false; + low = 0; + for (s = abfd->sections; s != NULL; s = s->next) + if (((s->flags + & (SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC | SEC_NEVER_LOAD)) + == (SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC)) + && (! found_low || s->lma < low)) + { + low = s->lma; + found_low = true; + } + + for (s = abfd->sections; s != NULL; s = s->next) + { + s->filepos = s->lma - low; + + /* Skip following warning check for sections that will not + occupy file space. */ + if ((s->flags + & (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_NEVER_LOAD)) + != (SEC_HAS_CONTENTS | SEC_ALLOC)) + continue; + + /* If attempting to generate a binary file from a bfd with + LMA's all over the place, huge (sparse?) binary files may + result. This condition attempts to detect this situation + and print a warning. Better heuristics would be nice to + have. */ + + if (s->filepos < 0) + (*_bfd_error_handler) + (_("Warning: Writing section `%s' to huge (ie negative) file offset 0x%lx."), + bfd_get_section_name (abfd, s), + (unsigned long) s->filepos); + } + + abfd->output_has_begun = true; + } + + /* We don't want to output anything for a section that is neither + loaded nor allocated. The contents of such a section are not + meaningful in the binary format. */ + if ((sec->flags & (SEC_LOAD | SEC_ALLOC)) == 0) + return true; + if ((sec->flags & SEC_NEVER_LOAD) != 0) + return 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_gc_sections bfd_generic_gc_sections +#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 +#define binary_get_section_contents_in_window \ + _bfd_generic_get_section_contents_in_window + +const bfd_target binary_vec = +{ + "binary", /* name */ + bfd_target_unknown_flavour, /* flavour */ + BFD_ENDIAN_UNKNOWN, /* byteorder */ + BFD_ENDIAN_UNKNOWN, /* header_byteorder */ + EXEC_P, /* object_flags */ + (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE | SEC_DATA + | SEC_ROM | SEC_HAS_CONTENTS), /* section_flags */ + 0, /* symbol_leading_char */ + ' ', /* ar_pad_char */ + 16, /* ar_max_namelen */ + 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 */ + bfd_getb64, bfd_getb_signed_64, bfd_putb64, + bfd_getb32, bfd_getb_signed_32, bfd_putb32, + bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */ + { /* bfd_check_format */ + _bfd_dummy_target, + binary_object_p, /* bfd_check_format */ + _bfd_dummy_target, + _bfd_dummy_target, + }, + { /* bfd_set_format */ + bfd_false, + binary_mkobject, + bfd_false, + bfd_false, + }, + { /* bfd_write_contents */ + bfd_false, + bfd_true, + bfd_false, + bfd_false, + }, + + 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 (binary), + BFD_JUMP_TABLE_WRITE (binary), + BFD_JUMP_TABLE_LINK (binary), + BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), + + NULL +}; |