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

#   Copyright 2001, 2002, 2003, 2004, 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 mmo.em, used to define

# MMIX-specific things common to ELF and MMO.

fragment <

#include "elf/mmix.h"

/* Set up handling of linker-allocated global registers.  */

static void

mmix_before_allocation (void)

{

  /* Call the default first.  */

  gld${EMULATION_NAME}_before_allocation ();

  /* There's a needrelax.em which uses this ..._before_allocation-hook and

     just has the statement below as payload.  It's more of a hassle to

     use that than to just include these two lines and take the

     maintenance burden to keep them in sync.  (Of course we lose the

     maintenance burden of checking that it still does what we need.)  */

  /* Force -relax on (regardless of whether we're doing a relocatable

     link).  */

  command_line.relax = TRUE;

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

    einfo ("%X%P: Internal problems setting up section %s",

           MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);

}

/* We need to set the VMA of the .MMIX.reg_contents section when it has

   been allocated, and produce the final settings for the linker-generated

   GREGs.  */

static void

mmix_after_allocation (void)

{

  asection *sec

    = bfd_get_section_by_name (link_info.output_bfd,

                               MMIX_REG_CONTENTS_SECTION_NAME);

  bfd_signed_vma regvma;

  /* If there's no register section, we don't need to do anything.  On the

     other hand, if there's a non-standard linker-script without a mapping

     from MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME when that section is

     present (as in the ld test "NOCROSSREFS 2"), that section (1) will be

     orphaned; not inserted in MMIX_REG_CONTENTS_SECTION_NAME and (2) we

     will not do the necessary preparations for those relocations that

     caused it to be created.  We'll SEGV from the latter error.  The

     former error in separation will result in a non-working binary, but

     that's expected when you play tricks with linker scripts.  The

     "NOCROSSREFS 2" test does not run the output so it does not matter

     there.  */

  if (sec == NULL)

    sec

      = bfd_get_section_by_name (link_info.output_bfd,

                                 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);

  if (sec == NULL)

    return;

  regvma = 256 * 8 - sec->size - 8;

  /* If we start on a local register, we have too many global registers.

     We treat this error as nonfatal (meaning processing will continue in

     search for other errors), because it's a link error in the same way

     as an undefined symbol.  */

  if (regvma < 32 * 8)

    {

      einfo ("%X%P: Too many global registers: %u, max 223\n",

             (unsigned) sec->size / 8);

      regvma = 32 * 8;

    }

  /* Set vma to correspond to first such register number * 8.  */

  bfd_set_section_vma (link_info.output_bfd, sec, (bfd_vma) regvma);

  /* Simplify symbol output for the register section (without contents;

     created for register symbols) by setting the output offset to 0.

     This section is only present when there are register symbols.  */

  sec = bfd_get_section_by_name (link_info.output_bfd, MMIX_REG_SECTION_NAME);

  if (sec != NULL)

    bfd_set_section_vma (abfd, sec, 0);

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

    {

      /* This is a fatal error; make einfo call not return.  */

      einfo ("%F%P: Can't finalize linker-allocated global registers\n");

    }

}

EOF

LDEMUL_AFTER_ALLOCATION=mmix_after_allocation

LDEMUL_BEFORE_ALLOCATION=mmix_before_allocation