binutils-gdb/bfd/coff-aux.c

/* BFD back-end for Apple M68K COFF A/UX 3.x files.
   Copyright 1996, 1997 Free Software Foundation, Inc.
   Written by Richard Henderson <rth@tamu.edu>.

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.  */

#define TARGET_SYM	m68kaux_coff_vec
#define TARGET_NAME	"coff-m68k-aux"

#ifndef TARG_AUX
#define TARG_AUX
#endif

#define COFF_LONG_FILENAMES

/* 4k pages */
#define COFF_PAGE_SIZE 0x1000

/* On AUX, a STYP_NOLOAD|STYP_BSS section is part of a shared library. */
#define BSS_NOLOAD_IS_SHARED_LIBRARY

#define STATIC_RELOCS

#define COFF_COMMON_ADDEND

#include "bfd.h"
#include "sysdep.h"

static boolean coff_m68k_aux_link_add_one_symbol
  PARAMS ((struct bfd_link_info *, bfd *, const char *, flagword, 
           asection *, bfd_vma, const char *, boolean, boolean, 
           struct bfd_link_hash_entry **));

#define coff_link_add_one_symbol coff_m68k_aux_link_add_one_symbol

#include "coff/aux-coff.h"  /* override coff/internal.h and coff/m68k.h */
#include "coff-m68k.c"

/* We need non-absolute symbols to override absolute symbols.  This
   mirrors Apple's "solution" to let a static library symbol override
   a shared library symbol.  On the whole not a good thing, given how
   shared libraries work here, but can work if you are careful with
   what you include in the shared object. */

static boolean
coff_m68k_aux_link_add_one_symbol (info, abfd, name, flags, section, value,
				   string, copy, collect, hashp)
     struct bfd_link_info *info;
     bfd *abfd;
     const char *name;
     flagword flags;
     asection *section;
     bfd_vma value;
     const char *string;
     boolean copy;
     boolean collect;
     struct bfd_link_hash_entry **hashp;
{
  struct bfd_link_hash_entry *h;

  if ((flags & (BSF_WARNING | BSF_CONSTRUCTOR | BSF_WEAK)) == 0 &&
      !bfd_is_und_section (section) &&
      !bfd_is_com_section (section))
    {
      /* The new symbol is a definition or an indirect definition */

      /* This bit copied from linker.c */
      if (hashp != NULL && *hashp != NULL)
	{
	  h = *hashp;
	  BFD_ASSERT (strcmp (h->root.string, name) == 0);
	}
      else
	{
	  h = bfd_link_hash_lookup (info->hash, name, true, copy, false);
	  if (h == NULL)
	    {
	      if (hashp != NULL)
		*hashp = NULL;
	      return false;
	    }
	}

      if (info->notice_hash != (struct bfd_hash_table *) NULL
	  && (bfd_hash_lookup (info->notice_hash, name, false, false)
	      != (struct bfd_hash_entry *) NULL))
	{
	  if (! (*info->callbacks->notice) (info, name, abfd, section, value))
	    return false;
	}

      if (hashp != (struct bfd_link_hash_entry **) NULL)
	*hashp = h;
      /* end duplication from linker.c */

      if (h->type == bfd_link_hash_defined
	  || h->type == bfd_link_hash_indirect)
	{
	  asection *msec;

	  if (h->type == bfd_link_hash_defined)
	    msec = h->u.def.section;
	  else
	    msec = bfd_ind_section_ptr;

	  if (bfd_is_abs_section (msec) && !bfd_is_abs_section (section))
	    {
	      h->u.def.section = section;
	      h->u.def.value = value;
	      return true;
	    }
	  else if (bfd_is_abs_section (section) && !bfd_is_abs_section (msec))
	    return true;
	}
    }

  /* If we didn't exit early, finish processing in the generic routine */
  return _bfd_generic_link_add_one_symbol (info, abfd, name, flags, section,
					   value, string, copy, collect,
					   hashp);
}