Initial revision

1 files changed, 386 insertions, 0 deletions

diff --git a/bfd/binary.c b/bfd/binary.c
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+/* 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
+};