Subversion Repositories openrisc_2011-10-31

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

#   Copyright 2003, 2004, 2005, 2007, 2008, 2009

#   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 alpha

# specific routines.

#

fragment <

#include "elf/internal.h"

#include "elf/alpha.h"

#include "elf-bfd.h"

static bfd_boolean limit_32bit;

static bfd_boolean disable_relaxation;

extern bfd_boolean elf64_alpha_use_secureplt;

/* Set the start address as in the Tru64 ld.  */

#define ALPHA_TEXT_START_32BIT 0x12000000

static void

alpha_after_open (void)

{

  if (bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour

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

    {

      unsigned int num_plt;

      lang_output_section_statement_type *os;

      lang_output_section_statement_type *plt_os[2];

      num_plt = 0;

      for (os = &lang_output_section_statement.head->output_section_statement;

           os != NULL;

           os = os->next)

        {

          if (os->constraint == SPECIAL && strcmp (os->name, ".plt") == 0)

            {

              if (num_plt < 2)

                plt_os[num_plt] = os;

              ++num_plt;

            }

        }

      if (num_plt == 2)

        {

          plt_os[0]->constraint = elf64_alpha_use_secureplt ? 0 : -1;

          plt_os[1]->constraint = elf64_alpha_use_secureplt ? -1 : 0;

        }

    }

  gld${EMULATION_NAME}_after_open ();

}

static void

alpha_after_parse (void)

{

  if (limit_32bit && !link_info.shared && !link_info.relocatable)

    lang_section_start (".interp",

                        exp_binop ('+',

                                   exp_intop (ALPHA_TEXT_START_32BIT),

                                   exp_nameop (SIZEOF_HEADERS, NULL)),

                        NULL);

  after_parse_default ();

}

static void

alpha_before_allocation (void)

{

  /* Call main function; we're just extending it.  */

  gld${EMULATION_NAME}_before_allocation ();

  /* Add -relax if -O, not -r, and not explicitly disabled.  */

  if (link_info.optimize && !link_info.relocatable && !disable_relaxation)

    command_line.relax = TRUE;

}

static void

alpha_finish (void)

{

  if (limit_32bit)

    elf_elfheader (link_info.output_bfd)->e_flags |= EF_ALPHA_32BIT;

  finish_default ();

}

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_TASO             300

#define OPTION_NO_RELAX         (OPTION_TASO + 1)

#define OPTION_SECUREPLT        (OPTION_NO_RELAX + 1)

#define OPTION_NO_SECUREPLT     (OPTION_SECUREPLT + 1)

'

PARSE_AND_LIST_LONGOPTS='

  { "taso", no_argument, NULL, OPTION_TASO },

  { "no-relax", no_argument, NULL, OPTION_NO_RELAX },

  { "secureplt", no_argument, NULL, OPTION_SECUREPLT },

  { "no-secureplt", no_argument, NULL, OPTION_NO_SECUREPLT },

'

PARSE_AND_LIST_OPTIONS='

  fprintf (file, _("\

  --taso                      Load executable in the lower 31-bit addressable\n\

                                virtual address range.\n\

  --no-relax                  Do not relax call and gp sequences.\n\

  --secureplt                 Force PLT in text segment.\n\

  --no-secureplt              Force PLT in data segment.\n\

"));

'

PARSE_AND_LIST_ARGS_CASES='

    case OPTION_TASO:

      limit_32bit = 1;

      break;

    case OPTION_NO_RELAX:

      disable_relaxation = TRUE;

      break;

    case OPTION_SECUREPLT:

      elf64_alpha_use_secureplt = TRUE;

      break;

    case OPTION_NO_SECUREPLT:

      elf64_alpha_use_secureplt = FALSE;

      break;

'

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

#

LDEMUL_AFTER_OPEN=alpha_after_open

LDEMUL_AFTER_PARSE=alpha_after_parse

LDEMUL_BEFORE_ALLOCATION=alpha_before_allocation

LDEMUL_FINISH=alpha_finish