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

#   Copyright 2004, 2006, 2007, 2008 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.

fragment <

#include "ldctor.h"

#include "elf/mips.h"

#include "elfxx-mips.h"

#define is_mips_elf(bfd)                                \

  (bfd_get_flavour (bfd) == bfd_target_elf_flavour      \

   && elf_tdata (bfd) != NULL                           \

   && elf_object_id (bfd) == MIPS_ELF_TDATA)

/* Fake input file for stubs.  */

static lang_input_statement_type *stub_file;

static bfd *stub_bfd;

static void

mips_after_parse (void)

{

  /* .gnu.hash and the MIPS ABI require .dynsym to be sorted in different

     ways.  .gnu.hash needs symbols to be grouped by hash code whereas the

     MIPS ABI requires a mapping between the GOT and the symbol table.  */

  if (link_info.emit_gnu_hash)

    {

      einfo ("%X%P: .gnu.hash is incompatible with the MIPS ABI\n");

      link_info.emit_hash = TRUE;

      link_info.emit_gnu_hash = FALSE;

    }

  after_parse_default ();

}

struct hook_stub_info

{

  lang_statement_list_type add;

  asection *input_section;

};

/* Traverse the linker tree to find the spot where the stub goes.  */

static bfd_boolean

hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)

{

  lang_statement_union_type *l;

  bfd_boolean ret;

  for (; (l = *lp) != NULL; lp = &l->header.next)

    {

      switch (l->header.type)

        {

        case lang_constructors_statement_enum:

          ret = hook_in_stub (info, &constructor_list.head);

          if (ret)

            return ret;

          break;

        case lang_output_section_statement_enum:

          ret = hook_in_stub (info,

                              &l->output_section_statement.children.head);

          if (ret)

            return ret;

          break;

        case lang_wild_statement_enum:

          ret = hook_in_stub (info, &l->wild_statement.children.head);

          if (ret)

            return ret;

          break;

        case lang_group_statement_enum:

          ret = hook_in_stub (info, &l->group_statement.children.head);

          if (ret)

            return ret;

          break;

        case lang_input_section_enum:

          if (info->input_section == NULL

              || l->input_section.section == info->input_section)

            {

              /* We've found our section.  Insert the stub immediately

                 before its associated input section.  */

              *lp = info->add.head;

              *(info->add.tail) = l;

              return TRUE;

            }

          break;

        case lang_data_statement_enum:

        case lang_reloc_statement_enum:

        case lang_object_symbols_statement_enum:

        case lang_output_statement_enum:

        case lang_target_statement_enum:

        case lang_input_statement_enum:

        case lang_assignment_statement_enum:

        case lang_padding_statement_enum:

        case lang_address_statement_enum:

        case lang_fill_statement_enum:

          break;

        default:

          FAIL ();

          break;

        }

    }

  return FALSE;

}

/* Create a new stub section called STUB_SEC_NAME and arrange for it to

   be linked in OUTPUT_SECTION.  The section should go at the beginning of

   OUTPUT_SECTION if INPUT_SECTION is null, otherwise it must go immediately

   before INPUT_SECTION.  */

static asection *

mips_add_stub_section (const char *stub_sec_name, asection *input_section,

                       asection *output_section)

{

  asection *stub_sec;

  flagword flags;

  const char *secname;

  lang_output_section_statement_type *os;

  struct hook_stub_info info;

  /* Create the stub file, if we haven't already.  */

  if (stub_file == NULL)

    {

      stub_file = lang_add_input_file ("linker stubs",

                                       lang_input_file_is_fake_enum,

                                       NULL);

      stub_bfd = bfd_create ("linker stubs", link_info.output_bfd);

      if (stub_bfd == NULL

          || !bfd_set_arch_mach (stub_bfd,

                                 bfd_get_arch (link_info.output_bfd),

                                 bfd_get_mach (link_info.output_bfd)))

        {

          einfo ("%F%P: can not create BFD %E\n");

          return NULL;

        }

      stub_bfd->flags |= BFD_LINKER_CREATED;

      stub_file->the_bfd = stub_bfd;

      ldlang_add_file (stub_file);

    }

  /* Create the section.  */

  stub_sec = bfd_make_section_anyway (stub_bfd, stub_sec_name);

  if (stub_sec == NULL)

    goto err_ret;

  /* Set the flags.  */

  flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE

           | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_KEEP);

  if (!bfd_set_section_flags (stub_bfd, stub_sec, flags))

    goto err_ret;

  /* Create an output section statement.  */

  secname = bfd_get_section_name (output_section->owner, output_section);

  os = lang_output_section_find (secname);

  /* Initialize a statement list that contains only the new statement.  */

  lang_list_init (&info.add);

  lang_add_section (&info.add, stub_sec, os);

  if (info.add.head == NULL)

    goto err_ret;

  /* Insert the new statement in the appropriate place.  */

  info.input_section = input_section;

  if (hook_in_stub (&info, &os->children.head))

    return stub_sec;

 err_ret:

  einfo ("%X%P: can not make stub section: %E\n");

  return NULL;

}

/* This is called before the input files are opened.  */

static void

mips_create_output_section_statements (void)

{

  if (is_mips_elf (link_info.output_bfd))

    _bfd_mips_elf_init_stubs (&link_info, mips_add_stub_section);

}

/* This is called after we have merged the private data of the input bfds.  */

static void

mips_before_allocation (void)

{

  flagword flags;

  flags = elf_elfheader (link_info.output_bfd)->e_flags;

  if (!link_info.shared

      && !link_info.nocopyreloc

      && (flags & (EF_MIPS_PIC | EF_MIPS_CPIC)) == EF_MIPS_CPIC)

    _bfd_mips_elf_use_plts_and_copy_relocs (&link_info);

  gld${EMULATION_NAME}_before_allocation ();

}

/* Avoid processing the fake stub_file in vercheck, stat_needed and

   check_needed routines.  */

static void (*real_func) (lang_input_statement_type *);

static void mips_for_each_input_file_wrapper (lang_input_statement_type *l)

{

  if (l != stub_file)

    (*real_func) (l);

}

static void

mips_lang_for_each_input_file (void (*func) (lang_input_statement_type *))

{

  real_func = func;

  lang_for_each_input_file (&mips_for_each_input_file_wrapper);

}

#define lang_for_each_input_file mips_lang_for_each_input_file

EOF

LDEMUL_AFTER_PARSE=mips_after_parse

LDEMUL_BEFORE_ALLOCATION=mips_before_allocation

LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=mips_create_output_section_statements