406 lines
12 KiB
C
406 lines
12 KiB
C
/* BFD back-end for binary objects.
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Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
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2004 Free Software Foundation, Inc.
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Written by Ian Lance Taylor, Cygnus Support, <ian@cygnus.com>
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* This is a BFD backend which may be used to write binary objects.
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It may only be used for output, not input. The intention is that
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this may be used as an output format for objcopy in order to
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generate raw binary data.
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This is very simple. The only complication is that the real data
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will start at some address X, and in some cases we will not want to
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include X zeroes just to get to that point. Since the start
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address is not meaningful for this object file format, we use it
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instead to indicate the number of zeroes to skip at the start of
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the file. objcopy cooperates by specially setting the start
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address to zero by default. */
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#include "bfd.h"
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#include "sysdep.h"
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#include "safe-ctype.h"
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#include "libbfd.h"
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/* Any bfd we create by reading a binary file has three symbols:
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a start symbol, an end symbol, and an absolute length symbol. */
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#define BIN_SYMS 3
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static bfd_boolean binary_mkobject PARAMS ((bfd *));
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static const bfd_target *binary_object_p PARAMS ((bfd *));
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static bfd_boolean binary_get_section_contents
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PARAMS ((bfd *, asection *, PTR, file_ptr, bfd_size_type));
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static long binary_get_symtab_upper_bound PARAMS ((bfd *));
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static char *mangle_name PARAMS ((bfd *, char *));
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static long binary_canonicalize_symtab PARAMS ((bfd *, asymbol **));
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static void binary_get_symbol_info PARAMS ((bfd *, asymbol *, symbol_info *));
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static bfd_boolean binary_set_section_contents
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PARAMS ((bfd *, asection *, const PTR, file_ptr, bfd_size_type));
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static int binary_sizeof_headers PARAMS ((bfd *, bfd_boolean));
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/* Set by external programs - specifies the BFD architecture and
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machine number to be uses when creating binary BFDs. */
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enum bfd_architecture bfd_external_binary_architecture = bfd_arch_unknown;
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unsigned long bfd_external_machine = 0;
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/* Create a binary object. Invoked via bfd_set_format. */
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static bfd_boolean
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binary_mkobject (abfd)
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bfd *abfd ATTRIBUTE_UNUSED;
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{
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return TRUE;
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}
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/* Any file may be considered to be a binary file, provided the target
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was not defaulted. That is, it must be explicitly specified as
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being binary. */
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static const bfd_target *
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binary_object_p (abfd)
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bfd *abfd;
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{
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struct stat statbuf;
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asection *sec;
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if (abfd->target_defaulted)
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{
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bfd_set_error (bfd_error_wrong_format);
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return NULL;
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}
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abfd->symcount = BIN_SYMS;
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/* Find the file size. */
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if (bfd_stat (abfd, &statbuf) < 0)
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{
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bfd_set_error (bfd_error_system_call);
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return NULL;
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}
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/* One data section. */
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sec = bfd_make_section (abfd, ".data");
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if (sec == NULL)
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return NULL;
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sec->flags = SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_HAS_CONTENTS;
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sec->vma = 0;
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sec->size = statbuf.st_size;
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sec->filepos = 0;
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abfd->tdata.any = (PTR) sec;
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if (bfd_get_arch_info (abfd) != NULL)
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{
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if ((bfd_get_arch_info (abfd)->arch == bfd_arch_unknown)
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&& (bfd_external_binary_architecture != bfd_arch_unknown))
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bfd_set_arch_info (abfd, bfd_lookup_arch
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(bfd_external_binary_architecture, bfd_external_machine));
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}
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return abfd->xvec;
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}
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#define binary_close_and_cleanup _bfd_generic_close_and_cleanup
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#define binary_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
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#define binary_new_section_hook _bfd_generic_new_section_hook
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/* Get contents of the only section. */
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static bfd_boolean
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binary_get_section_contents (abfd, section, location, offset, count)
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bfd *abfd;
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asection *section ATTRIBUTE_UNUSED;
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PTR location;
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file_ptr offset;
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bfd_size_type count;
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{
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if (bfd_seek (abfd, offset, SEEK_SET) != 0
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|| bfd_bread (location, count, abfd) != count)
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return FALSE;
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return TRUE;
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}
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/* Return the amount of memory needed to read the symbol table. */
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static long
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binary_get_symtab_upper_bound (abfd)
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bfd *abfd ATTRIBUTE_UNUSED;
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{
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return (BIN_SYMS + 1) * sizeof (asymbol *);
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}
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/* Create a symbol name based on the bfd's filename. */
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static char *
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mangle_name (abfd, suffix)
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bfd *abfd;
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char *suffix;
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{
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bfd_size_type size;
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char *buf;
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char *p;
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size = (strlen (bfd_get_filename (abfd))
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+ strlen (suffix)
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+ sizeof "_binary__");
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buf = (char *) bfd_alloc (abfd, size);
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if (buf == NULL)
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return "";
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sprintf (buf, "_binary_%s_%s", bfd_get_filename (abfd), suffix);
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/* Change any non-alphanumeric characters to underscores. */
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for (p = buf; *p; p++)
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if (! ISALNUM (*p))
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*p = '_';
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return buf;
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}
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/* Return the symbol table. */
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static long
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binary_canonicalize_symtab (abfd, alocation)
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bfd *abfd;
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asymbol **alocation;
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{
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asection *sec = (asection *) abfd->tdata.any;
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asymbol *syms;
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unsigned int i;
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bfd_size_type amt = BIN_SYMS * sizeof (asymbol);
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syms = (asymbol *) bfd_alloc (abfd, amt);
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if (syms == NULL)
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return 0;
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/* Start symbol. */
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syms[0].the_bfd = abfd;
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syms[0].name = mangle_name (abfd, "start");
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syms[0].value = 0;
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syms[0].flags = BSF_GLOBAL;
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syms[0].section = sec;
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syms[0].udata.p = NULL;
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/* End symbol. */
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syms[1].the_bfd = abfd;
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syms[1].name = mangle_name (abfd, "end");
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syms[1].value = sec->size;
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syms[1].flags = BSF_GLOBAL;
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syms[1].section = sec;
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syms[1].udata.p = NULL;
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/* Size symbol. */
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syms[2].the_bfd = abfd;
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syms[2].name = mangle_name (abfd, "size");
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syms[2].value = sec->size;
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syms[2].flags = BSF_GLOBAL;
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syms[2].section = bfd_abs_section_ptr;
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syms[2].udata.p = NULL;
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for (i = 0; i < BIN_SYMS; i++)
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*alocation++ = syms++;
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*alocation = NULL;
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return BIN_SYMS;
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}
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#define binary_make_empty_symbol _bfd_generic_make_empty_symbol
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#define binary_print_symbol _bfd_nosymbols_print_symbol
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/* Get information about a symbol. */
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static void
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binary_get_symbol_info (ignore_abfd, symbol, ret)
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bfd *ignore_abfd ATTRIBUTE_UNUSED;
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asymbol *symbol;
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symbol_info *ret;
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{
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bfd_symbol_info (symbol, ret);
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}
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#define binary_bfd_is_local_label_name bfd_generic_is_local_label_name
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#define binary_get_lineno _bfd_nosymbols_get_lineno
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#define binary_find_nearest_line _bfd_nosymbols_find_nearest_line
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#define binary_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
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#define binary_read_minisymbols _bfd_generic_read_minisymbols
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#define binary_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
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#define binary_get_reloc_upper_bound \
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((long (*) PARAMS ((bfd *, asection *))) bfd_0l)
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#define binary_canonicalize_reloc \
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((long (*) PARAMS ((bfd *, asection *, arelent **, asymbol **))) bfd_0l)
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#define binary_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup
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/* Set the architecture of a binary file. */
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#define binary_set_arch_mach _bfd_generic_set_arch_mach
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/* Write section contents of a binary file. */
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static bfd_boolean
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binary_set_section_contents (abfd, sec, data, offset, size)
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bfd *abfd;
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asection *sec;
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const PTR data;
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file_ptr offset;
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bfd_size_type size;
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{
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if (size == 0)
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return TRUE;
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if (! abfd->output_has_begun)
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{
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bfd_boolean found_low;
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bfd_vma low;
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asection *s;
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/* The lowest section LMA sets the virtual address of the start
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of the file. We use this to set the file position of all the
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sections. */
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found_low = FALSE;
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low = 0;
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for (s = abfd->sections; s != NULL; s = s->next)
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if (((s->flags
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& (SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC | SEC_NEVER_LOAD))
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== (SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC))
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&& (s->size > 0)
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&& (! found_low || s->lma < low))
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{
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low = s->lma;
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found_low = TRUE;
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}
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for (s = abfd->sections; s != NULL; s = s->next)
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{
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s->filepos = s->lma - low;
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/* Skip following warning check for sections that will not
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occupy file space. */
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if ((s->flags
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& (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_NEVER_LOAD))
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!= (SEC_HAS_CONTENTS | SEC_ALLOC)
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|| (s->size == 0))
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continue;
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/* If attempting to generate a binary file from a bfd with
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LMA's all over the place, huge (sparse?) binary files may
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result. This condition attempts to detect this situation
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and print a warning. Better heuristics would be nice to
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have. */
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if (s->filepos < 0)
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(*_bfd_error_handler)
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(_("Warning: Writing section `%s' to huge (ie negative) file offset 0x%lx."),
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bfd_get_section_name (abfd, s),
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(unsigned long) s->filepos);
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}
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abfd->output_has_begun = TRUE;
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}
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/* We don't want to output anything for a section that is neither
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loaded nor allocated. The contents of such a section are not
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meaningful in the binary format. */
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if ((sec->flags & (SEC_LOAD | SEC_ALLOC)) == 0)
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return TRUE;
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if ((sec->flags & SEC_NEVER_LOAD) != 0)
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return TRUE;
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return _bfd_generic_set_section_contents (abfd, sec, data, offset, size);
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}
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/* No space is required for header information. */
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static int
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binary_sizeof_headers (abfd, exec)
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bfd *abfd ATTRIBUTE_UNUSED;
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bfd_boolean exec ATTRIBUTE_UNUSED;
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{
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return 0;
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}
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#define binary_bfd_get_relocated_section_contents \
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bfd_generic_get_relocated_section_contents
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#define binary_bfd_relax_section bfd_generic_relax_section
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#define binary_bfd_gc_sections bfd_generic_gc_sections
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#define binary_bfd_merge_sections bfd_generic_merge_sections
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#define binary_bfd_is_group_section bfd_generic_is_group_section
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#define binary_bfd_discard_group bfd_generic_discard_group
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#define binary_section_already_linked \
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_bfd_generic_section_already_linked
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#define binary_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
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#define binary_bfd_link_hash_table_free _bfd_generic_link_hash_table_free
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#define binary_bfd_link_just_syms _bfd_generic_link_just_syms
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#define binary_bfd_link_add_symbols _bfd_generic_link_add_symbols
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#define binary_bfd_final_link _bfd_generic_final_link
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#define binary_bfd_link_split_section _bfd_generic_link_split_section
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#define binary_get_section_contents_in_window \
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_bfd_generic_get_section_contents_in_window
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const bfd_target binary_vec =
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{
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"binary", /* name */
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bfd_target_unknown_flavour, /* flavour */
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BFD_ENDIAN_UNKNOWN, /* byteorder */
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BFD_ENDIAN_UNKNOWN, /* header_byteorder */
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EXEC_P, /* object_flags */
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(SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE | SEC_DATA
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| SEC_ROM | SEC_HAS_CONTENTS), /* section_flags */
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0, /* symbol_leading_char */
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' ', /* ar_pad_char */
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16, /* ar_max_namelen */
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bfd_getb64, bfd_getb_signed_64, bfd_putb64,
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bfd_getb32, bfd_getb_signed_32, bfd_putb32,
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bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */
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bfd_getb64, bfd_getb_signed_64, bfd_putb64,
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bfd_getb32, bfd_getb_signed_32, bfd_putb32,
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bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
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{ /* bfd_check_format */
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_bfd_dummy_target,
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binary_object_p, /* bfd_check_format */
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_bfd_dummy_target,
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_bfd_dummy_target,
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},
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{ /* bfd_set_format */
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bfd_false,
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binary_mkobject,
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bfd_false,
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bfd_false,
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},
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{ /* bfd_write_contents */
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bfd_false,
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bfd_true,
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bfd_false,
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bfd_false,
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},
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BFD_JUMP_TABLE_GENERIC (binary),
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BFD_JUMP_TABLE_COPY (_bfd_generic),
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BFD_JUMP_TABLE_CORE (_bfd_nocore),
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BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
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BFD_JUMP_TABLE_SYMBOLS (binary),
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BFD_JUMP_TABLE_RELOCS (binary),
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BFD_JUMP_TABLE_WRITE (binary),
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BFD_JUMP_TABLE_LINK (binary),
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BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
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NULL,
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NULL
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};
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