/* BFD back-end for binary objects.
- Copyright 1994 Free Software Foundation, Inc.
+ 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.
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
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 ATTRIBUTE_UNUSED;
+{
+ 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 ATTRIBUTE_UNUSED;
+ 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;
}
-/* 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
+/* Return the amount of memory needed to read the symbol table. */
+
+static long
+binary_get_symtab_upper_bound (abfd)
+ bfd *abfd ATTRIBUTE_UNUSED;
+{
+ 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 "";
-/* We do have to provide a routine to make an empty symbol. */
+ 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;
{
- asymbol *ret;
+ return (asymbol *) bfd_alloc (abfd, sizeof (asymbol));
+}
+
+#define binary_print_symbol _bfd_nosymbols_print_symbol
- ret = (asymbol *) bfd_alloc (abfd, sizeof (asymbol));
- if (ret == NULL)
- bfd_set_error (bfd_error_no_memory);
- return ret;
+/* Get information about a symbol. */
+
+static void
+binary_get_symbol_info (ignore_abfd, symbol, ret)
+ bfd *ignore_abfd ATTRIBUTE_UNUSED;
+ 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
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 (size == 0)
+ return true;
- 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;
+ 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))
+ && (s->_raw_size > 0)
+ && (! 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)
+ || (s->_raw_size == 0))
+ 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 ATTRIBUTE_UNUSED;
+ boolean exec ATTRIBUTE_UNUSED;
+{
+ 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 */
- true, /* byteorder_big_p */
- true, /* header_byteorder_big_p */
+ 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 */
- 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 */
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,
},
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,
+
NULL
};