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# This shell script emits a C file. -*- C -*-

#   Copyright 2000, 2001, 2003, 2005, 2007, 2008, 2009

#   Free Software Foundation, Inc.

#   Written by Michael Sokolov , based on armelf.em

#

# 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.

# This file is sourced from elf32.em, and defines some extra routines for m68k

# embedded systems using ELF and for some other systems using m68k ELF.  While

# it is sourced from elf32.em for all m68k ELF configurations, here we include

# only the features we want depending on the configuration.

case ${target} in

  m68*-*-elf)

    echo "#define SUPPORT_EMBEDDED_RELOCS" >>e${EMULATION_NAME}.c

    ;;

esac

case ${target} in

  *-linux*)

# Don't use multi-GOT by default due to glibc linker's assumption

# that GOT pointer points to GOT[0].

#   got_handling_target_default=GOT_HANDLING_MULTIGOT

    got_handling_target_default=GOT_HANDLING_SINGLE

    ;;

  *)

    got_handling_target_default=GOT_HANDLING_SINGLE

    ;;

esac

fragment <

#define GOT_HANDLING_SINGLE   (0)

#define GOT_HANDLING_NEGATIVE (1)

#define GOT_HANDLING_MULTIGOT (2)

#define GOT_HANDLING_TARGET_DEFAULT ${got_handling_target_default}

/* How to generate GOT.  */

static int got_handling = GOT_HANDLING_DEFAULT;

#ifdef SUPPORT_EMBEDDED_RELOCS

static void check_sections (bfd *, asection *, void *);

#endif

/* This function is run after all the input files have been opened.  */

static void

m68k_elf_after_open (void)

{

  /* Call the standard elf routine.  */

  gld${EMULATION_NAME}_after_open ();

#ifdef SUPPORT_EMBEDDED_RELOCS

  if (command_line.embedded_relocs

      && (! link_info.relocatable))

    {

      bfd *abfd;

      /* In the embedded relocs mode we create a .emreloc section for each

         input file with a nonzero .data section.  The BFD backend will fill in

         these sections with magic numbers which can be used to relocate the

         data section at run time.  */

      for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)

        {

          asection *datasec;

          /* As first-order business, make sure that each input BFD is either

             COFF or ELF.  We need to call a special BFD backend function to

             generate the embedded relocs, and we have such functions only for

             COFF and ELF.  */

          if (bfd_get_flavour (abfd) != bfd_target_coff_flavour

              && bfd_get_flavour (abfd) != bfd_target_elf_flavour)

            einfo ("%F%B: all input objects must be COFF or ELF for --embedded-relocs\n");

          datasec = bfd_get_section_by_name (abfd, ".data");

          /* Note that we assume that the reloc_count field has already

             been set up.  We could call bfd_get_reloc_upper_bound, but

             that returns the size of a memory buffer rather than a reloc

             count.  We do not want to call bfd_canonicalize_reloc,

             because although it would always work it would force us to

             read in the relocs into BFD canonical form, which would waste

             a significant amount of time and memory.  */

          if (datasec != NULL && datasec->reloc_count > 0)

            {

              asection *relsec;

              relsec = bfd_make_section_with_flags (abfd, ".emreloc",

                                                    (SEC_ALLOC

                                                    | SEC_LOAD

                                                    | SEC_HAS_CONTENTS

                                                    | SEC_IN_MEMORY));

              if (relsec == NULL

                  || ! bfd_set_section_alignment (abfd, relsec, 2)

                  || ! bfd_set_section_size (abfd, relsec,

                                             datasec->reloc_count * 12))

                einfo ("%F%B: can not create .emreloc section: %E\n");

            }

          /* Double check that all other data sections are empty, as is

             required for embedded PIC code.  */

          bfd_map_over_sections (abfd, check_sections, datasec);

        }

    }

#endif /* SUPPORT_EMBEDDED_RELOCS */

}

#ifdef SUPPORT_EMBEDDED_RELOCS

/* Check that of the data sections, only the .data section has

   relocs.  This is called via bfd_map_over_sections.  */

static void

check_sections (bfd *abfd, asection *sec, void *datasec)

{

  if ((bfd_get_section_flags (abfd, sec) & SEC_DATA)

      && sec != datasec

      && sec->reloc_count != 0)

    einfo ("%B%X: section %s has relocs; can not use --embedded-relocs\n",

           abfd, bfd_get_section_name (abfd, sec));

}

#endif /* SUPPORT_EMBEDDED_RELOCS */

/* This function is called after the section sizes and offsets have

   been set.  */

static void

m68k_elf_after_allocation (void)

{

  /* Call the standard elf routine.  */

  gld${EMULATION_NAME}_after_allocation ();

#ifdef SUPPORT_EMBEDDED_RELOCS

  if (command_line.embedded_relocs

      && (! link_info.relocatable))

    {

      bfd *abfd;

      /* If we are generating embedded relocs, call a special BFD backend

         routine to do the work.  */

      for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)

        {

          asection *datasec, *relsec;

          char *errmsg;

          datasec = bfd_get_section_by_name (abfd, ".data");

          if (datasec == NULL || datasec->reloc_count == 0)

            continue;

          relsec = bfd_get_section_by_name (abfd, ".emreloc");

          ASSERT (relsec != NULL);

          if (bfd_get_flavour (abfd) == bfd_target_coff_flavour)

            {

              if (! bfd_m68k_coff_create_embedded_relocs (abfd, &link_info,

                                                          datasec, relsec,

                                                          &errmsg))

                {

                  if (errmsg == NULL)

                    einfo ("%B%X: can not create runtime reloc information: %E\n",

                           abfd);

                  else

                    einfo ("%X%B: can not create runtime reloc information: %s\n",

                           abfd, errmsg);

                }

            }

          else if (bfd_get_flavour (abfd) == bfd_target_elf_flavour)

            {

              if (! bfd_m68k_elf32_create_embedded_relocs (abfd, &link_info,

                                                           datasec, relsec,

                                                           &errmsg))

                {

                  if (errmsg == NULL)

                    einfo ("%B%X: can not create runtime reloc information: %E\n",

                           abfd);

                  else

                    einfo ("%X%B: can not create runtime reloc information: %s\n",

                           abfd, errmsg);

                }

            }

          else

            abort ();

        }

    }

#endif /* SUPPORT_EMBEDDED_RELOCS */

}

/* This is a convenient point to tell BFD about target specific flags.

   After the output has been created, but before inputs are read.  */

static void

elf_m68k_create_output_section_statements (void)

{

  bfd_elf_m68k_set_target_options (&link_info, got_handling);

}

EOF

# Define some shell vars to insert bits of code into the standard elf

# parse_args and list_options functions.

#

PARSE_AND_LIST_PROLOGUE='

#define OPTION_GOT      301

'

PARSE_AND_LIST_LONGOPTS='

  { "got", required_argument, NULL, OPTION_GOT},

'

PARSE_AND_LIST_OPTIONS='

  fprintf (file, _("  --got=                Specify GOT handling scheme\n"));

'

PARSE_AND_LIST_ARGS_CASES='

    case OPTION_GOT:

      if (strcmp (optarg, "target") == 0)

        got_handling = GOT_HANDLING_TARGET_DEFAULT;

      else if (strcmp (optarg, "single") == 0)

        got_handling = 0;

      else if (strcmp (optarg, "negative") == 0)

        got_handling = 1;

      else if (strcmp (optarg, "multigot") == 0)

        got_handling = 2;

      else

        einfo (_("Unrecognized --got argument '\''%s'\''.\n"), optarg);

      break;

'

# We have our own after_open and after_allocation functions, but they call

# the standard routines, so give them a different name.

LDEMUL_AFTER_OPEN=m68k_elf_after_open

LDEMUL_AFTER_ALLOCATION=m68k_elf_after_allocation

LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=elf_m68k_create_output_section_statements