ld/emultempl/mmo.em - binutils-gdb - Git at Google

 # This shell script emits a C file. -*- C -*-
 #   Copyright 2001, 2002 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.

 cat >>e${EMULATION_NAME}.c <<EOF
 /* Need to have this define before mmix-elfnmmo, which includes
    needrelax.em which uses this name for the before_allocation function,
    normally defined in elf32.em.  */
 #define gldmmo_before_allocation before_allocation_default
 EOF

 . ${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));
 static void mmo_after_open PARAMS ((void));

 /* 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, NULL);

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

   snew = os->bfd_section;
   if (snew == NULL)
     /* /DISCARD/ section.  */
     return true;

   /* We need an output section for .text as a root, so if there was none
      (might happen with a peculiar linker script such as in "map
      addresses", map-address.exp), we grab the output section created
      above.  */
   if (hold_text.os == NULL)
     {
       if (os == NULL)
 	return false;
       hold_text.os = os;
     }

   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)
 	;
       bfd_section_list_remove (output_bfd, pps);

       /* Now tack it on to the "place->os" section list.  */
       bfd_section_list_insert (output_bfd, 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);
 }

 /* To get on-demand global register allocation right, we need to parse the
    relocs, like what happens when linking to ELF.  It needs to be done
    before all input sections are supposed to be present.  When linking to
    ELF, it's done when reading symbols.  When linking to mmo, we do it
    when all input files are seen, which is equivalent.  */

 static void
 mmo_after_open ()
 {
   /* When there's a mismatch between the output format and the emulation
      (using weird combinations like "-m mmo --oformat elf64-mmix" for
      example), we'd count relocs twice because they'd also be counted
      along the usual route for ELF-only linking, which would lead to an
      internal accounting error.  */
   if (bfd_get_flavour (output_bfd) != bfd_target_elf_flavour)
     {
       LANG_FOR_EACH_INPUT_STATEMENT (is)
 	{
 	  if (bfd_get_flavour (is->the_bfd) == bfd_target_elf_flavour
 	      && !_bfd_mmix_check_all_relocs (is->the_bfd, &link_info))
 	    einfo ("%X%P: Internal problems scanning %B after opening it",
 		   is->the_bfd);
 	}
     }
 }
 EOF

 LDEMUL_PLACE_ORPHAN=mmo_place_orphan
 LDEMUL_FINISH=mmo_finish
 LDEMUL_AFTER_OPEN=mmo_after_open
	# This shell script emits a C file. -- C --
	# Copyright 2001, 2002 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.

	cat >>e${EMULATION_NAME}.c <<EOF
	/* Need to have this define before mmix-elfnmmo, which includes
	needrelax.em which uses this name for the before_allocation function,
	normally defined in elf32.em. */
	#define gldmmo_before_allocation before_allocation_default
	EOF

	. ${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));
	static void mmo_after_open PARAMS ((void));

	/* 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, NULL);

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

	snew = os->bfd_section;
	if (snew == NULL)
	/* /DISCARD/ section. */
	return true;

	/* We need an output section for .text as a root, so if there was none
	(might happen with a peculiar linker script such as in "map
	addresses", map-address.exp), we grab the output section created
	above. */
	if (hold_text.os == NULL)
	{
	if (os == NULL)
	return false;
	hold_text.os = os;
	}

	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)
	;
	bfd_section_list_remove (output_bfd, pps);

	/* Now tack it on to the "place->os" section list. */
	bfd_section_list_insert (output_bfd, 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);
	}

	/* To get on-demand global register allocation right, we need to parse the
	relocs, like what happens when linking to ELF. It needs to be done
	before all input sections are supposed to be present. When linking to
	ELF, it's done when reading symbols. When linking to mmo, we do it
	when all input files are seen, which is equivalent. */

	static void
	mmo_after_open ()
	{
	/* When there's a mismatch between the output format and the emulation
	(using weird combinations like "-m mmo --oformat elf64-mmix" for
	example), we'd count relocs twice because they'd also be counted
	along the usual route for ELF-only linking, which would lead to an
	internal accounting error. */
	if (bfd_get_flavour (output_bfd) != bfd_target_elf_flavour)
	{
	LANG_FOR_EACH_INPUT_STATEMENT (is)
	{
	if (bfd_get_flavour (is->the_bfd) == bfd_target_elf_flavour
	&& !_bfd_mmix_check_all_relocs (is->the_bfd, &link_info))
	einfo ("%X%P: Internal problems scanning %B after opening it",
	is->the_bfd);
	}
	}
	}
	EOF

	LDEMUL_PLACE_ORPHAN=mmo_place_orphan
	LDEMUL_FINISH=mmo_finish
	LDEMUL_AFTER_OPEN=mmo_after_open