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

#   Copyright 1991, 1993, 1994, 1997, 1999, 2000, 2001, 2002, 2003, 2004,

#   2005, 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.

#

# This file is sourced from elf32.em, and defines extra hppa-elf

# specific routines.

#

fragment <

#include "ldctor.h"

#include "elf32-hppa.h"

/* Fake input file for stubs.  */

static lang_input_statement_type *stub_file;

/* Type of import/export stubs to build.  For a single sub-space model,

   we can build smaller import stubs and there is no need for export

   stubs.  */

static int multi_subspace = 0;

/* Whether we need to call hppa_layout_sections_again.  */

static int need_laying_out = 0;

/* Maximum size of a group of input sections that can be handled by

   one stub section.  A value of +/-1 indicates the bfd back-end

   should use a suitable default size.  */

static bfd_signed_vma group_size = 1;

/* Stops the linker merging .text sections on a relocatable link,

   and adds millicode library to the list of input files.  */

static void

hppaelf_after_parse (void)

{

  if (link_info.relocatable)

    lang_add_unique (".text");

  /* Enable this once we split millicode stuff from libgcc:

     lang_add_input_file ("milli",

                          lang_input_file_is_l_enum,

                          NULL);

  */

}

/* This is called before the input files are opened.  We create a new

   fake input file to hold the stub sections.  */

static void

hppaelf_create_output_section_statements (void)

{

  if (!(bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour

        && elf_object_id (link_info.output_bfd) == HPPA_ELF_TDATA))

    return;

  stub_file = lang_add_input_file ("linker stubs",

                                   lang_input_file_is_fake_enum,

                                   NULL);

  stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);

  if (stub_file->the_bfd == NULL

      || ! bfd_set_arch_mach (stub_file->the_bfd,

                              bfd_get_arch (link_info.output_bfd),

                              bfd_get_mach (link_info.output_bfd)))

    {

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

      return;

    }

  stub_file->the_bfd->flags |= BFD_LINKER_CREATED;

  ldlang_add_file (stub_file);

}

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 (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;

}

/* Call-back for elf32_hppa_size_stubs.  */

/* Create a new stub section, and arrange for it to be linked

   immediately before INPUT_SECTION.  */

static asection *

hppaelf_add_stub_section (const char *stub_sec_name, asection *input_section)

{

  asection *stub_sec;

  flagword flags;

  asection *output_section;

  const char *secname;

  lang_output_section_statement_type *os;

  struct hook_stub_info info;

  stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);

  if (stub_sec == NULL)

    goto err_ret;

  flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE

           | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);

  if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))

    goto err_ret;

  output_section = input_section->output_section;

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

  os = lang_output_section_find (secname);

  info.input_section = input_section;

  lang_list_init (&info.add);

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

  if (info.add.head == NULL)

    goto err_ret;

  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;

}

/* Another call-back for elf32_hppa_size_stubs.  */

static void

hppaelf_layout_sections_again (void)

{

  /* If we have changed sizes of the stub sections, then we need

     to recalculate all the section offsets.  This may mean we need to

     add even more stubs.  */

  gld${EMULATION_NAME}_map_segments (TRUE);

  need_laying_out = -1;

}

static void

build_section_lists (lang_statement_union_type *statement)

{

  if (statement->header.type == lang_input_section_enum)

    {

      asection *i = statement->input_section.section;

      if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag

          && (i->flags & SEC_EXCLUDE) == 0

          && i->output_section != NULL

          && i->output_section->owner == link_info.output_bfd)

        {

          elf32_hppa_next_input_section (&link_info, i);

        }

    }

}

/* Final emulation specific call.  For the PA we use this opportunity

   to build linker stubs.  */

static void

gld${EMULATION_NAME}_finish (void)

{

  /* bfd_elf_discard_info just plays with debugging sections,

     ie. doesn't affect any code, so we can delay resizing the

     sections.  It's likely we'll resize everything in the process of

     adding stubs.  */

  if (bfd_elf_discard_info (link_info.output_bfd, &link_info))

    need_laying_out = 1;

  /* If generating a relocatable output file, then we don't

     have to examine the relocs.  */

  if (stub_file != NULL && !link_info.relocatable)

    {

      int ret = elf32_hppa_setup_section_lists (link_info.output_bfd,

                                                &link_info);

      if (ret != 0)

        {

          if (ret < 0)

            {

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

              return;

            }

          lang_for_each_statement (build_section_lists);

          /* Call into the BFD backend to do the real work.  */

          if (! elf32_hppa_size_stubs (link_info.output_bfd,

                                       stub_file->the_bfd,

                                       &link_info,

                                       multi_subspace,

                                       group_size,

                                       &hppaelf_add_stub_section,

                                       &hppaelf_layout_sections_again))

            {

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

              return;

            }

        }

    }

  if (need_laying_out != -1)

    gld${EMULATION_NAME}_map_segments (need_laying_out);

  if (! link_info.relocatable)

    {

      /* Set the global data pointer.  */

      if (! elf32_hppa_set_gp (link_info.output_bfd, &link_info))

        {

          einfo ("%X%P: can not set gp\n");

          return;

        }

      /* Now build the linker stubs.  */

      if (stub_file != NULL && stub_file->the_bfd->sections != NULL)

        {

          if (! elf32_hppa_build_stubs (&link_info))

            einfo ("%X%P: can not build stubs: %E\n");

        }

    }

  finish_default ();

}

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

   check_needed routines.  */

static void (*real_func) (lang_input_statement_type *);

static void hppa_for_each_input_file_wrapper (lang_input_statement_type *l)

{

  if (l != stub_file)

    (*real_func) (l);

}

static void

hppa_lang_for_each_input_file (void (*func) (lang_input_statement_type *))

{

  real_func = func;

  lang_for_each_input_file (&hppa_for_each_input_file_wrapper);

}

#define lang_for_each_input_file hppa_lang_for_each_input_file

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_MULTI_SUBSPACE           301

#define OPTION_STUBGROUP_SIZE           (OPTION_MULTI_SUBSPACE + 1)

'

PARSE_AND_LIST_LONGOPTS='

  { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE },

  { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },

'

PARSE_AND_LIST_OPTIONS='

  fprintf (file, _("\

  --multi-subspace            Generate import and export stubs to support\n\

                                multiple sub-space shared libraries\n"

                   ));

  fprintf (file, _("\

  --stub-group-size=N         Maximum size of a group of input sections that\n\

                                can be handled by one stub section.  A negative\n\

                                value locates all stubs before their branches\n\

                                (with a group size of -N), while a positive\n\

                                value allows two groups of input sections, one\n\

                                before, and one after each stub section.\n\

                                Values of +/-1 indicate the linker should\n\

                                choose suitable defaults.\n"

                   ));

'

PARSE_AND_LIST_ARGS_CASES='

    case OPTION_MULTI_SUBSPACE:

      multi_subspace = 1;

      break;

    case OPTION_STUBGROUP_SIZE:

      {

        const char *end;

        group_size = bfd_scan_vma (optarg, &end, 0);

        if (*end)

          einfo (_("%P%F: invalid number `%s'\''\n"), optarg);

      }

      break;

'

# Put these extra hppaelf routines in ld_${EMULATION_NAME}_emulation

#

LDEMUL_AFTER_PARSE=hppaelf_after_parse

LDEMUL_FINISH=gld${EMULATION_NAME}_finish

LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements