darling-gdb/ld/emultempl/mmo.em

# This shell script emits a C file. -*- C -*-
#   Copyright 2001 Free Software Foundation, Inc.
#
# This file is part of GLD, the Gnu Linker.
#
# 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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#

# This file is sourced from elf32.em and mmo.em, used to define
# linker MMIX-specifics common to ELF and MMO.

. ${srcdir}/emultempl/mmix-elfnmmo.em

cat >>e${EMULATION_NAME}.c <<EOF

static boolean mmo_place_orphan
  PARAMS ((lang_input_statement_type *, asection *));
static asection *output_prev_sec_find
  PARAMS ((lang_output_section_statement_type *));
static void mmo_finish PARAMS ((void));
static void mmo_wipe_sec_reloc_flag PARAMS ((bfd *, asection *, PTR));

/* Find the last output section before given output statement.
   Used by place_orphan.  */

static asection *
output_prev_sec_find (os)
     lang_output_section_statement_type *os;
{
  asection *s = (asection *) NULL;
  lang_statement_union_type *u;
  lang_output_section_statement_type *lookup;

  for (u = lang_output_section_statement.head;
       u != (lang_statement_union_type *) NULL;
       u = lookup->next)
    {
      lookup = &u->output_section_statement;
      if (lookup == os)
	break;
      if (lookup->bfd_section != NULL
	  && lookup->bfd_section != bfd_abs_section_ptr
	  && lookup->bfd_section != bfd_com_section_ptr
	  && lookup->bfd_section != bfd_und_section_ptr)
	s = lookup->bfd_section;
    }

  if (u == NULL)
    return NULL;

  return s;
}

struct orphan_save {
  lang_output_section_statement_type *os;
  asection **section;
  lang_statement_union_type **stmt;
};

#define HAVE_SECTION(hold, name) \
(hold.os != NULL || (hold.os = lang_output_section_find (name)) != NULL)

/* Place an orphan section.  We use this to put random SEC_CODE or
   SEC_READONLY sections right after MMO_TEXT_SECTION_NAME.  Much borrowed
   from elf32.em.  */

static boolean
mmo_place_orphan (file, s)
	lang_input_statement_type *file;
	asection *s;
{
  static struct orphan_save hold_text;
  struct orphan_save *place;
  lang_output_section_statement_type *os;
  lang_statement_list_type *old;
  lang_statement_list_type add;
  asection *snew, **pps, *bfd_section;

  /* We have nothing to say for anything other than a final link.  */
  if (link_info.relocateable
      || (bfd_get_section_flags (s->owner, s)
	  & (SEC_EXCLUDE | SEC_LOAD)) != SEC_LOAD)
    return false;

  /* Only care for sections we're going to load.  */
  os = lang_output_section_find (bfd_get_section_name (s->owner, s));

  /* We have an output section by this name.  Place the section inside it
     (regardless of whether the linker script lists it as input).  */
  if (os != NULL)
    {
      lang_add_section (&os->children, s, os, file);
      return true;
    }

  /* If this section does not have .text-type section flags or there's no
     MMO_TEXT_SECTION_NAME, we don't have anything to say.  */
  if ((bfd_get_section_flags (s->owner, s) & (SEC_CODE | SEC_READONLY)) == 0)
    return false;

  if (hold_text.os == NULL)
    hold_text.os = lang_output_section_find (MMO_TEXT_SECTION_NAME);

  place = &hold_text;

  /* If there's an output section by this name, we'll use it, regardless
     of section flags, in contrast to what's done in elf32.em.  */

  /* Start building a list of statements for this section.
     First save the current statement pointer.  */
  old = stat_ptr;

  /* Add the output section statements for this orphan to our own private
     list, inserting them later into the global statement list.  */
  stat_ptr = &add;
  lang_list_init (stat_ptr);

  os = lang_enter_output_section_statement (bfd_get_section_name (s->owner,
								  s),
					    NULL, 0,
					    (bfd_vma) 0,
					    (etree_type *) NULL,
					    (etree_type *) NULL,
					    (etree_type *) NULL);

  lang_add_section (&os->children, s, os, file);

  lang_leave_output_section_statement
    ((bfd_vma) 0, "*default*",
     (struct lang_output_section_phdr_list *) NULL, "*default*");

  /* Restore the global list pointer.  */
  stat_ptr = old;

  snew = os->bfd_section;
  bfd_section = place->os->bfd_section;
  if (place->section == NULL && bfd_section == NULL)
    bfd_section = output_prev_sec_find (place->os);

  if (place->section != NULL
      || (bfd_section != NULL
	  && bfd_section != snew))
    {
      /* Shuffle the section to make the output file look neater.  This is
	 really only cosmetic.  */
      if (place->section == NULL)
	/* Put orphans after the first section on the list.  */
	place->section = &bfd_section->next;

      /*  Unlink the section.  */
      for (pps = &output_bfd->sections; *pps != snew; pps = &(*pps)->next)
	;
      *pps = snew->next;

      /* Now tack it on to the "place->os" section list.  */
      snew->next = *place->section;
      *place->section = snew;
    }
  place->section = &snew->next;	/* Save the end of this list.  */

  if (add.head != NULL)
    {
      /* We try to put the output statements in some sort of reasonable
	 order here, because they determine the final load addresses of
	 the orphan sections.  */
      if (place->stmt == NULL)
	{
	  /* Put the new statement list right at the head.  */
	  *add.tail = place->os->header.next;
	  place->os->header.next = add.head;
	}
      else
	{
	  /* Put it after the last orphan statement we added.  */
	  *add.tail = *place->stmt;
	  *place->stmt = add.head;
	}

      /* Fix the global list pointer if we happened to tack our new list
	 at the tail.  */
      if (*old->tail == add.head)
	old->tail = add.tail;

      /* Save the end of this list.  */
      place->stmt = add.tail;
    }

  return true;
}

/* Remove the spurious settings of SEC_RELOC that make it to the output at
   link time.  We are as confused as elflink.h:elf_bfd_final_link, and
   paper over the bug similarly.  */

static void
mmo_wipe_sec_reloc_flag (abfd, sec, ptr)
     bfd *abfd;
     asection *sec;
     PTR ptr ATTRIBUTE_UNUSED;
{
  bfd_set_section_flags (abfd, sec,
			 bfd_get_section_flags (abfd, sec) & ~SEC_RELOC);
}

/* Iterate with bfd_map_over_sections over mmo_wipe_sec_reloc_flag... */

static void
mmo_finish ()
{
  bfd_map_over_sections (output_bfd, mmo_wipe_sec_reloc_flag, NULL);
}

EOF

LDEMUL_PLACE_ORPHAN=mmo_place_orphan
LDEMUL_FINISH=mmo_finish