2011-07-29 Tristan Gingold <gingold@adacore.com>

[deliverable/binutils-gdb.git] / bfd / aout-adobe.c

/* BFD back-end for a.out.adobe binaries.
   Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000,
   2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2011
   Free Software Foundation, Inc.
   Written by Cygnus Support.  Based on bout.c.

   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 3 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */

#include "sysdep.h"
#include "bfd.h"
#include "libbfd.h"
#include "aout/adobe.h"
#include "aout/stab_gnu.h"
#include "libaout.h"		/* BFD a.out internal data structures.  */

/* Forward decl.  */
extern const bfd_target a_out_adobe_vec;

/* Swaps the information in an executable header taken from a raw byte
   stream memory image, into the internal exec_header structure.  */

static void
aout_adobe_swap_exec_header_in (bfd *abfd,
				struct external_exec *bytes,
				struct internal_exec *execp)
{
  /* Now fill in fields in the execp, from the bytes in the raw data.  */
  execp->a_info   = H_GET_32 (abfd, bytes->e_info);
  execp->a_text   = GET_WORD (abfd, bytes->e_text);
  execp->a_data   = GET_WORD (abfd, bytes->e_data);
  execp->a_bss    = GET_WORD (abfd, bytes->e_bss);
  execp->a_syms   = GET_WORD (abfd, bytes->e_syms);
  execp->a_entry  = GET_WORD (abfd, bytes->e_entry);
  execp->a_trsize = GET_WORD (abfd, bytes->e_trsize);
  execp->a_drsize = GET_WORD (abfd, bytes->e_drsize);
}

/* Swaps the information in an internal exec header structure into the
   supplied buffer ready for writing to disk.  */

static void
aout_adobe_swap_exec_header_out (bfd *abfd,
				 struct internal_exec *execp,
				 struct external_exec *bytes)
{
  /* Now fill in fields in the raw data, from the fields in the exec
     struct.  */
  H_PUT_32 (abfd, execp->a_info  , bytes->e_info);
  PUT_WORD (abfd, execp->a_text  , bytes->e_text);
  PUT_WORD (abfd, execp->a_data  , bytes->e_data);
  PUT_WORD (abfd, execp->a_bss   , bytes->e_bss);
  PUT_WORD (abfd, execp->a_syms  , bytes->e_syms);
  PUT_WORD (abfd, execp->a_entry , bytes->e_entry);
  PUT_WORD (abfd, execp->a_trsize, bytes->e_trsize);
  PUT_WORD (abfd, execp->a_drsize, bytes->e_drsize);
}

/* Finish up the opening of a b.out file for reading.  Fill in all the
   fields that are not handled by common code.  */

static const bfd_target *
aout_adobe_callback (bfd *abfd)
{
  struct internal_exec *execp = exec_hdr (abfd);
  asection *sect;
  struct external_segdesc ext[1];
  char *section_name;
  char try_again[30];	/* Name and number.  */
  char *newname;
  int trynum;
  flagword flags;

  /* Architecture and machine type -- unknown in this format.  */
  bfd_set_arch_mach (abfd, bfd_arch_unknown, 0L);

  /* The positions of the string table and symbol table.  */
  obj_str_filepos (abfd) = N_STROFF (*execp);
  obj_sym_filepos (abfd) = N_SYMOFF (*execp);

  /* Suck up the section information from the file, one section at a time.  */
  for (;;)
    {
      bfd_size_type amt = sizeof (*ext);
      if (bfd_bread ( ext, amt, abfd) != amt)
	{
	  if (bfd_get_error () != bfd_error_system_call)
	    bfd_set_error (bfd_error_wrong_format);

	  return NULL;
	}
      switch (ext->e_type[0])
	{
	case N_TEXT:
	  section_name = ".text";
	  flags = SEC_CODE | SEC_LOAD | SEC_ALLOC | SEC_HAS_CONTENTS;
	  break;

	case N_DATA:
	  section_name = ".data";
	  flags = SEC_DATA | SEC_LOAD | SEC_ALLOC | SEC_HAS_CONTENTS;
	  break;

	case N_BSS:
	  section_name = ".bss";
	  flags = SEC_DATA | SEC_HAS_CONTENTS;
	  break;

	case 0:
	  goto no_more_sections;

	default:
	  (*_bfd_error_handler)
	    (_("%B: Unknown section type in a.out.adobe file: %x\n"),
	     abfd, ext->e_type[0]);
	  goto no_more_sections;
	}

      /* First one is called ".text" or whatever; subsequent ones are
	 ".text1", ".text2", ...  */
      bfd_set_error (bfd_error_no_error);
      sect = bfd_make_section_with_flags (abfd, section_name, flags);
      trynum = 0;

      while (!sect)
	{
	  if (bfd_get_error () != bfd_error_no_error)
	    /* Some other error -- slide into the sunset.  */
	    return NULL;
	  sprintf (try_again, "%s%d", section_name, ++trynum);
	  sect = bfd_make_section_with_flags (abfd, try_again, flags);
	}

      /* Fix the name, if it is a sprintf'd name.  */
      if (sect->name == try_again)
	{
	  amt = strlen (sect->name);
	  newname = bfd_zalloc (abfd, amt);
	  if (newname == NULL)
	    return NULL;
	  strcpy (newname, sect->name);
	  sect->name = newname;
	}

      /* Assumed big-endian.  */
      sect->size = ((ext->e_size[0] << 8)
		    | ext->e_size[1] << 8
		    | ext->e_size[2]);
      sect->vma = H_GET_32 (abfd, ext->e_virtbase);
      sect->filepos = H_GET_32 (abfd, ext->e_filebase);
      /* FIXME XXX alignment?  */

      /* Set relocation information for first section of each type.  */
      if (trynum == 0)
	switch (ext->e_type[0])
	  {
	  case N_TEXT:
	    sect->rel_filepos = N_TRELOFF (*execp);
	    sect->reloc_count = execp->a_trsize;
	    break;

	  case N_DATA:
	    sect->rel_filepos = N_DRELOFF (*execp);
	    sect->reloc_count = execp->a_drsize;
	    break;

	  default:
	    break;
	  }
    }
 no_more_sections:

  adata (abfd).reloc_entry_size = sizeof (struct reloc_std_external);
  adata (abfd).symbol_entry_size = sizeof (struct external_nlist);
  adata (abfd).page_size = 1; /* Not applicable.  */
  adata (abfd).segment_size = 1; /* Not applicable.  */
  adata (abfd).exec_bytes_size = EXEC_BYTES_SIZE;

  return abfd->xvec;
}

static const bfd_target *
aout_adobe_object_p (bfd *abfd)
{
  struct internal_exec anexec;
  struct external_exec exec_bytes;
  char *targ;
  bfd_size_type amt = EXEC_BYTES_SIZE;

  if (bfd_bread (& exec_bytes, amt, abfd) != amt)
    {
      if (bfd_get_error () != bfd_error_system_call)
	bfd_set_error (bfd_error_wrong_format);
      return NULL;
    }

  anexec.a_info = H_GET_32 (abfd, exec_bytes.e_info);

  /* Normally we just compare for the magic number.
     However, a bunch of Adobe tools aren't fixed up yet; they generate
     files using ZMAGIC(!).
     If the environment variable GNUTARGET is set to "a.out.adobe", we will
     take just about any a.out file as an Adobe a.out file.  FIXME!  */

  if (N_BADMAG (anexec))
    {
      targ = getenv ("GNUTARGET");
      if (targ && !strcmp (targ, a_out_adobe_vec.name))
	/* Just continue anyway, if specifically set to this format.  */
	;
      else
	{
	  bfd_set_error (bfd_error_wrong_format);
	  return NULL;
	}
    }

  aout_adobe_swap_exec_header_in (abfd, &exec_bytes, &anexec);
  return aout_32_some_aout_object_p (abfd, &anexec, aout_adobe_callback);
}

struct bout_data_struct
{
  struct aoutdata a;
  struct internal_exec e;
};

static bfd_boolean
aout_adobe_mkobject (bfd *abfd)
{
  struct bout_data_struct *rawptr;
  bfd_size_type amt = sizeof (struct bout_data_struct);

  rawptr = bfd_zalloc (abfd, amt);
  if (rawptr == NULL)
    return FALSE;

  abfd->tdata.bout_data = rawptr;
  exec_hdr (abfd) = &rawptr->e;

  adata (abfd).reloc_entry_size = sizeof (struct reloc_std_external);
  adata (abfd).symbol_entry_size = sizeof (struct external_nlist);
  adata (abfd).page_size = 1; /* Not applicable.  */
  adata (abfd).segment_size = 1; /* Not applicable.  */
  adata (abfd).exec_bytes_size = EXEC_BYTES_SIZE;

  return TRUE;
}

static void
aout_adobe_write_section (bfd *abfd ATTRIBUTE_UNUSED,
			  sec_ptr sect ATTRIBUTE_UNUSED)
{
  /* FIXME XXX.  */
}

static bfd_boolean
aout_adobe_write_object_contents (bfd *abfd)
{
  struct external_exec swapped_hdr;
  static struct external_segdesc sentinel[1];	/* Initialized to zero.  */
  asection *sect;
  bfd_size_type amt;

  exec_hdr (abfd)->a_info = ZMAGIC;

  /* Calculate text size as total of text sections, etc.  */
  exec_hdr (abfd)->a_text = 0;
  exec_hdr (abfd)->a_data = 0;
  exec_hdr (abfd)->a_bss  = 0;
  exec_hdr (abfd)->a_trsize = 0;
  exec_hdr (abfd)->a_drsize = 0;

  for (sect = abfd->sections; sect; sect = sect->next)
    {
      if (sect->flags & SEC_CODE)
	{
	  exec_hdr (abfd)->a_text += sect->size;
	  exec_hdr (abfd)->a_trsize += sect->reloc_count *
	    sizeof (struct reloc_std_external);
	}
      else if (sect->flags & SEC_DATA)
	{
	  exec_hdr (abfd)->a_data += sect->size;
	  exec_hdr (abfd)->a_drsize += sect->reloc_count *
	    sizeof (struct reloc_std_external);
	}
      else if (sect->flags & SEC_ALLOC && !(sect->flags & SEC_LOAD))
	exec_hdr (abfd)->a_bss += sect->size;
    }

  exec_hdr (abfd)->a_syms = bfd_get_symcount (abfd)
    * sizeof (struct external_nlist);
  exec_hdr (abfd)->a_entry = bfd_get_start_address (abfd);

  aout_adobe_swap_exec_header_out (abfd, exec_hdr (abfd), &swapped_hdr);

  amt = EXEC_BYTES_SIZE;
  if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
      || bfd_bwrite (& swapped_hdr, amt, abfd) != amt)
    return FALSE;

  /* Now write out the section information.  Text first, data next, rest
     afterward.  */
  for (sect = abfd->sections; sect; sect = sect->next)
    if (sect->flags & SEC_CODE)
      aout_adobe_write_section (abfd, sect);

  for (sect = abfd->sections; sect; sect = sect->next)
    if (sect->flags & SEC_DATA)
      aout_adobe_write_section (abfd, sect);

  for (sect = abfd->sections; sect; sect = sect->next)
    if (!(sect->flags & (SEC_CODE | SEC_DATA)))
      aout_adobe_write_section (abfd, sect);

  /* Write final `sentinel` section header (with type of 0).  */
  amt = sizeof (*sentinel);
  if (bfd_bwrite (sentinel, amt, abfd) != amt)
    return FALSE;

  /* Now write out reloc info, followed by syms and strings.  */
  if (bfd_get_symcount (abfd) != 0)
    {
      if (bfd_seek (abfd, (file_ptr) (N_SYMOFF (*exec_hdr (abfd))), SEEK_SET)
	  != 0)
	return FALSE;

      if (! aout_32_write_syms (abfd))
	return FALSE;

      if (bfd_seek (abfd, (file_ptr) (N_TRELOFF (*exec_hdr (abfd))), SEEK_SET)
	  != 0)
	return FALSE;

      for (sect = abfd->sections; sect; sect = sect->next)
	if (sect->flags & SEC_CODE)
	  if (!aout_32_squirt_out_relocs (abfd, sect))
	    return FALSE;

      if (bfd_seek (abfd, (file_ptr) (N_DRELOFF (*exec_hdr (abfd))), SEEK_SET)
	  != 0)
	return FALSE;

      for (sect = abfd->sections; sect; sect = sect->next)
	if (sect->flags & SEC_DATA)
	  if (!aout_32_squirt_out_relocs (abfd, sect))
	    return FALSE;
    }

  return TRUE;
}
\f
static bfd_boolean
aout_adobe_set_section_contents (bfd *abfd,
				 asection *section,
				 const void * location,
				 file_ptr offset,
				 bfd_size_type count)
{
  file_ptr section_start;
  sec_ptr sect;

  /* Set by bfd.c handler.  */
  if (! abfd->output_has_begun)
    {
      /* Assign file offsets to sections.  Text sections are first, and
	 are contiguous.  Then data sections.  Everything else at the end.  */
      section_start = N_TXTOFF (ignore<-->me);

      for (sect = abfd->sections; sect; sect = sect->next)
	{
	  if (sect->flags & SEC_CODE)
	    {
	      sect->filepos = section_start;
	      /* FIXME:  Round to alignment.  */
	      section_start += sect->size;
	    }
	}

      for (sect = abfd->sections; sect; sect = sect->next)
	{
	  if (sect->flags & SEC_DATA)
	    {
	      sect->filepos = section_start;
	      /* FIXME:  Round to alignment.  */
	      section_start += sect->size;
	    }
	}

      for (sect = abfd->sections; sect; sect = sect->next)
	{
	  if (sect->flags & SEC_HAS_CONTENTS &&
	      !(sect->flags & (SEC_CODE | SEC_DATA)))
	    {
	      sect->filepos = section_start;
	      /* FIXME:  Round to alignment.  */
	      section_start += sect->size;
	    }
	}
    }

  /* Regardless, once we know what we're doing, we might as well get
     going.  */
  if (bfd_seek (abfd, section->filepos + offset, SEEK_SET) != 0)
    return FALSE;

  if (count == 0)
    return TRUE;

  return bfd_bwrite (location, count, abfd) == count;
}

static bfd_boolean
aout_adobe_set_arch_mach (bfd *abfd,
			  enum bfd_architecture arch,
			  unsigned long machine)
{
  if (! bfd_default_set_arch_mach (abfd, arch, machine))
    return FALSE;

  if (arch == bfd_arch_unknown
      || arch == bfd_arch_m68k)
    return TRUE;

  return FALSE;
}

static int
aout_adobe_sizeof_headers (bfd *ignore_abfd ATTRIBUTE_UNUSED,
			   struct bfd_link_info *info ATTRIBUTE_UNUSED)
{
  return sizeof (struct internal_exec);
}

/* Build the transfer vector for Adobe A.Out files.  */

#define aout_32_bfd_make_debug_symbol ((asymbol *(*) (bfd *, void *, unsigned long)) bfd_nullvoidptr)
#define aout_32_bfd_reloc_type_lookup ((reloc_howto_type *(*) (bfd *, bfd_reloc_code_real_type)) bfd_nullvoidptr)
#define aout_32_bfd_reloc_name_lookup ((reloc_howto_type *(*) (bfd *, const char *)) bfd_nullvoidptr)
#define aout_32_close_and_cleanup                   aout_32_bfd_free_cached_info
#define	aout_32_set_arch_mach		            aout_adobe_set_arch_mach
#define	aout_32_set_section_contents	            aout_adobe_set_section_contents
#define	aout_32_sizeof_headers		            aout_adobe_sizeof_headers
#define aout_32_bfd_get_relocated_section_contents  bfd_generic_get_relocated_section_contents
#define aout_32_get_section_contents_in_window      _bfd_generic_get_section_contents_in_window
#define aout_32_bfd_relax_section                   bfd_generic_relax_section
#define aout_32_bfd_gc_sections                     bfd_generic_gc_sections
#define aout_32_bfd_lookup_section_flags	    bfd_generic_lookup_section_flags
#define aout_32_bfd_merge_sections	            bfd_generic_merge_sections
#define aout_32_bfd_is_group_section	            bfd_generic_is_group_section
#define aout_32_bfd_discard_group	            bfd_generic_discard_group
#define aout_32_section_already_linked              _bfd_generic_section_already_linked
#define aout_32_bfd_define_common_symbol            bfd_generic_define_common_symbol
#define aout_32_bfd_link_hash_table_create          _bfd_generic_link_hash_table_create
#define aout_32_bfd_link_hash_table_free            _bfd_generic_link_hash_table_free
#define aout_32_bfd_link_add_symbols	            _bfd_generic_link_add_symbols
#define aout_32_bfd_link_just_syms	            _bfd_generic_link_just_syms
#define aout_32_bfd_copy_link_hash_symbol_type \
  _bfd_generic_copy_link_hash_symbol_type
#define aout_32_bfd_final_link		            _bfd_generic_final_link
#define aout_32_bfd_link_split_section	            _bfd_generic_link_split_section

const bfd_target a_out_adobe_vec =
{
  "a.out.adobe",		/* Name.  */
  bfd_target_aout_flavour,
  BFD_ENDIAN_BIG,		/* Data byte order is unknown (big assumed).  */
  BFD_ENDIAN_BIG,		/* Header byte order is big.  */
  (HAS_RELOC | EXEC_P |		/* Object flags.  */
   HAS_LINENO | HAS_DEBUG |
   HAS_SYMS | HAS_LOCALS | WP_TEXT ),
  /* section flags */
  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_DATA | SEC_RELOC),
  '_',				/* Symbol leading char.  */
  ' ',				/* AR_pad_char.  */
  16,				/* AR_max_namelen.  */
  0,				/* match priority.  */

  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,	/* Headers.  */

  {_bfd_dummy_target, aout_adobe_object_p,	/* bfd_check_format.  */
   bfd_generic_archive_p, _bfd_dummy_target},
  {bfd_false, aout_adobe_mkobject,		/* bfd_set_format.  */
   _bfd_generic_mkarchive, bfd_false},
  {bfd_false, aout_adobe_write_object_contents,/* bfd_write_contents.  */
   _bfd_write_archive_contents, bfd_false},

  BFD_JUMP_TABLE_GENERIC (aout_32),
  BFD_JUMP_TABLE_COPY (_bfd_generic),
  BFD_JUMP_TABLE_CORE (_bfd_nocore),
  BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_bsd),
  BFD_JUMP_TABLE_SYMBOLS (aout_32),
  BFD_JUMP_TABLE_RELOCS (aout_32),
  BFD_JUMP_TABLE_WRITE (aout_32),
  BFD_JUMP_TABLE_LINK (aout_32),
  BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),

  NULL,

  NULL
};