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/* ldemul.c -- clearing house for ld emulation states

   Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,

   2001, 2002, 2003, 2005, 2007, 2008, 2009, 2010, 2011

   Free Software Foundation, Inc.

   This file is part of the GNU Binutils.

   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 "getopt.h"

#include "bfdlink.h"

#include "ld.h"

#include "ldmisc.h"

#include "ldexp.h"

#include "ldlang.h"

#include "ldfile.h"

#include "ldemul.h"

#include "ldmain.h"

#include "ldemul-list.h"

static ld_emulation_xfer_type *ld_emulation;

void

ldemul_hll (char *name)

{

  ld_emulation->hll (name);

}

void

ldemul_syslib (char *name)

{

  ld_emulation->syslib (name);

}

void

ldemul_after_parse (void)

{

  ld_emulation->after_parse ();

}

void

ldemul_before_parse (void)

{

  ld_emulation->before_parse ();

}

void

ldemul_after_open (void)

{

  ld_emulation->after_open ();

}

void

ldemul_after_allocation (void)

{

  ld_emulation->after_allocation ();

}

void

ldemul_before_allocation (void)

{

  ld_emulation->before_allocation ();

}

void

ldemul_set_output_arch (void)

{

  ld_emulation->set_output_arch ();

}

void

ldemul_finish (void)

{

  ld_emulation->finish ();

}

void

ldemul_set_symbols (void)

{

  if (ld_emulation->set_symbols)

    ld_emulation->set_symbols ();

}

void

ldemul_create_output_section_statements (void)

{

  if (ld_emulation->create_output_section_statements)

    ld_emulation->create_output_section_statements ();

}

char *

ldemul_get_script (int *isfile)

{

  return ld_emulation->get_script (isfile);

}

bfd_boolean

ldemul_open_dynamic_archive (const char *arch, search_dirs_type *search,

                             lang_input_statement_type *entry)

{

  if (ld_emulation->open_dynamic_archive)

    return (*ld_emulation->open_dynamic_archive) (arch, search, entry);

  return FALSE;

}

lang_output_section_statement_type *

ldemul_place_orphan (asection *s, const char *name, int constraint)

{

  if (ld_emulation->place_orphan)

    return (*ld_emulation->place_orphan) (s, name, constraint);

  return NULL;

}

void

ldemul_add_options (int ns, char **shortopts, int nl,

                    struct option **longopts, int nrl,

                    struct option **really_longopts)

{

  if (ld_emulation->add_options)

    (*ld_emulation->add_options) (ns, shortopts, nl, longopts,

                                  nrl, really_longopts);

}

bfd_boolean

ldemul_handle_option (int optc)

{

  if (ld_emulation->handle_option)

    return (*ld_emulation->handle_option) (optc);

  return FALSE;

}

bfd_boolean

ldemul_parse_args (int argc, char **argv)

{

  /* Try and use the emulation parser if there is one.  */

  if (ld_emulation->parse_args)

    return (*ld_emulation->parse_args) (argc, argv);

  return FALSE;

}

/* Let the emulation code handle an unrecognized file.  */

bfd_boolean

ldemul_unrecognized_file (lang_input_statement_type *entry)

{

  if (ld_emulation->unrecognized_file)

    return (*ld_emulation->unrecognized_file) (entry);

  return FALSE;

}

/* Let the emulation code handle a recognized file.  */

bfd_boolean

ldemul_recognized_file (lang_input_statement_type *entry)

{

  if (ld_emulation->recognized_file)

    return (*ld_emulation->recognized_file) (entry);

  return FALSE;

}

char *

ldemul_choose_target (int argc, char **argv)

{

  return ld_emulation->choose_target (argc, argv);

}

/* The default choose_target function.  */

char *

ldemul_default_target (int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)

{

  char *from_outside = getenv (TARGET_ENVIRON);

  if (from_outside != (char *) NULL)

    return from_outside;

  return ld_emulation->target_name;

}

/* If the entry point was not specified as an address, then add the

   symbol as undefined.  This will cause ld to extract an archive

   element defining the entry if ld is linking against such an archive.

   We don't do this when generating shared libraries unless given -e

   on the command line, because most shared libs are not designed to

   be run as an executable.  However, some are, eg. glibc ld.so and

   may rely on the default linker script supplying ENTRY.  So we can't

   remove the ENTRY from the script, but would rather not insert

   undefined _start syms.  */

void

after_parse_default (void)

{

  if (entry_symbol.name != NULL

      && (link_info.executable || entry_from_cmdline))

    {

      bfd_boolean is_vma = FALSE;

      if (entry_from_cmdline)

        {

          const char *send;

          bfd_scan_vma (entry_symbol.name, &send, 0);

          is_vma = *send == '\0';

        }

      if (!is_vma)

        ldlang_add_undef (entry_symbol.name, entry_from_cmdline);

    }

}

void

after_open_default (void)

{

}

void

after_allocation_default (void)

{

  lang_relax_sections (FALSE);

}

void

before_allocation_default (void)

{

  if (!link_info.relocatable)

    strip_excluded_output_sections ();

}

void

finish_default (void)

{

  if (!link_info.relocatable)

    _bfd_fix_excluded_sec_syms (link_info.output_bfd, &link_info);

}

void

set_output_arch_default (void)

{

  /* Set the output architecture and machine if possible.  */

  bfd_set_arch_mach (link_info.output_bfd,

                     ldfile_output_architecture, ldfile_output_machine);

  bfd_emul_set_maxpagesize (output_target, config.maxpagesize);

  bfd_emul_set_commonpagesize (output_target, config.commonpagesize);

}

void

syslib_default (char *ignore ATTRIBUTE_UNUSED)

{

  info_msg (_("%S SYSLIB ignored\n"));

}

void

hll_default (char *ignore ATTRIBUTE_UNUSED)

{

  info_msg (_("%S HLL ignored\n"));

}

ld_emulation_xfer_type *ld_emulations[] = { EMULATION_LIST };

void

ldemul_choose_mode (char *target)

{

  ld_emulation_xfer_type **eptr = ld_emulations;

  /* Ignore "gld" prefix.  */

  if (target[0] == 'g' && target[1] == 'l' && target[2] == 'd')

    target += 3;

  for (; *eptr; eptr++)

    {

      if (strcmp (target, (*eptr)->emulation_name) == 0)

        {

          ld_emulation = *eptr;

          return;

        }

    }

  einfo (_("%P: unrecognised emulation mode: %s\n"), target);

  einfo (_("Supported emulations: "));

  ldemul_list_emulations (stderr);

  einfo ("%F\n");

}

void

ldemul_list_emulations (FILE *f)

{

  ld_emulation_xfer_type **eptr = ld_emulations;

  bfd_boolean first = TRUE;

  for (; *eptr; eptr++)

    {

      if (first)

        first = FALSE;

      else

        fprintf (f, " ");

      fprintf (f, "%s", (*eptr)->emulation_name);

    }

}

void

ldemul_list_emulation_options (FILE *f)

{

  ld_emulation_xfer_type **eptr;

  int options_found = 0;

  for (eptr = ld_emulations; *eptr; eptr++)

    {

      ld_emulation_xfer_type *emul = *eptr;

      if (emul->list_options)

        {

          fprintf (f, "%s: \n", emul->emulation_name);

          emul->list_options (f);

          options_found = 1;

        }

    }

  if (! options_found)

    fprintf (f, _("  no emulation specific options.\n"));

}

int

ldemul_find_potential_libraries (char *name, lang_input_statement_type *entry)

{

  if (ld_emulation->find_potential_libraries)

    return ld_emulation->find_potential_libraries (name, entry);

  return 0;

}

struct bfd_elf_version_expr *

ldemul_new_vers_pattern (struct bfd_elf_version_expr *entry)

{

  if (ld_emulation->new_vers_pattern)

    entry = (*ld_emulation->new_vers_pattern) (entry);

  return entry;

}