[deliverable/binutils-gdb.git] / ld / emultempl / mmo.em

# 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, "*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)
	;
      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);
}
\f
/* 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
Commit	Line	Data
3c3bdf30	1	# This shell script emits a C file. -- C --
48fa4a5d	2	# Copyright 2001, 2002 Free Software Foundation, Inc.
3c3bdf30 NC	3	#
	4	# This file is part of GLD, the Gnu Linker.
	5	#
	6	# This program is free software; you can redistribute it and/or modify
	7	# it under the terms of the GNU General Public License as published by
	8	# the Free Software Foundation; either version 2 of the License, or
	9	# (at your option) any later version.
	10	#
	11	# This program is distributed in the hope that it will be useful,
	12	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	# GNU General Public License for more details.
	15	#
	16	# You should have received a copy of the GNU General Public License
	17	# along with this program; if not, write to the Free Software
	18	# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	19	#
	20
	21	# This file is sourced from elf32.em and mmo.em, used to define
	22	# linker MMIX-specifics common to ELF and MMO.
	23
48fa4a5d HPN	24	cat >>e${EMULATION_NAME}.c <<EOF
	25	/* Need to have this define before mmix-elfnmmo, which includes
	26	needrelax.em which uses this name for the before_allocation function,
	27	normally defined in elf32.em. */
	28	#define gldmmo_before_allocation before_allocation_default
	29	EOF
	30
3c3bdf30 NC	31	. ${srcdir}/emultempl/mmix-elfnmmo.em
	32
	33	cat >>e${EMULATION_NAME}.c <<EOF
	34
	35	static boolean mmo_place_orphan
	36	PARAMS ((lang_input_statement_type , asection ));
	37	static asection *output_prev_sec_find
	38	PARAMS ((lang_output_section_statement_type *));
	39	static void mmo_finish PARAMS ((void));
	40	static void mmo_wipe_sec_reloc_flag PARAMS ((bfd , asection , PTR));
48fa4a5d	41	static void mmo_after_open PARAMS ((void));
3c3bdf30 NC	42
	43	/* Find the last output section before given output statement.
	44	Used by place_orphan. */
	45
	46	static asection *
	47	output_prev_sec_find (os)
	48	lang_output_section_statement_type *os;
	49	{
	50	asection s = (asection ) NULL;
	51	lang_statement_union_type *u;
	52	lang_output_section_statement_type *lookup;
	53
	54	for (u = lang_output_section_statement.head;
	55	u != (lang_statement_union_type *) NULL;
	56	u = lookup->next)
	57	{
	58	lookup = &u->output_section_statement;
	59	if (lookup == os)
	60	break;
	61	if (lookup->bfd_section != NULL
	62	&& lookup->bfd_section != bfd_abs_section_ptr
	63	&& lookup->bfd_section != bfd_com_section_ptr
	64	&& lookup->bfd_section != bfd_und_section_ptr)
	65	s = lookup->bfd_section;
	66	}
	67
	68	if (u == NULL)
	69	return NULL;
	70
	71	return s;
	72	}
	73
	74	struct orphan_save {
	75	lang_output_section_statement_type *os;
	76	asection **section;
	77	lang_statement_union_type **stmt;
	78	};
	79
	80	#define HAVE_SECTION(hold, name) \
	81	(hold.os != NULL \|\| (hold.os = lang_output_section_find (name)) != NULL)
	82
	83	/* Place an orphan section. We use this to put random SEC_CODE or
	84	SEC_READONLY sections right after MMO_TEXT_SECTION_NAME. Much borrowed
	85	from elf32.em. */
	86
	87	static boolean
	88	mmo_place_orphan (file, s)
	89	lang_input_statement_type *file;
	90	asection *s;
	91	{
	92	static struct orphan_save hold_text;
	93	struct orphan_save *place;
	94	lang_output_section_statement_type *os;
	95	lang_statement_list_type *old;
	96	lang_statement_list_type add;
	97	asection snew, pps, bfd_section;
	98
	99	/* We have nothing to say for anything other than a final link. */
	100	if (link_info.relocateable
	101	\|\| (bfd_get_section_flags (s->owner, s)
	102	& (SEC_EXCLUDE \| SEC_LOAD)) != SEC_LOAD)
	103	return false;
	104
	105	/* Only care for sections we're going to load. */
106	os = lang_output_section_find (bfd_get_section_name (s->owner, s));
107
108	/* We have an output section by this name. Place the section inside it
109	(regardless of whether the linker script lists it as input). */
110	if (os != NULL)
111	{
112	lang_add_section (&os->children, s, os, file);
113	return true;
114	}
115
116	/* If this section does not have .text-type section flags or there's no
117	MMO_TEXT_SECTION_NAME, we don't have anything to say. */
118	if ((bfd_get_section_flags (s->owner, s) & (SEC_CODE \| SEC_READONLY)) == 0)
119	return false;
120
121	if (hold_text.os == NULL)
122	hold_text.os = lang_output_section_find (MMO_TEXT_SECTION_NAME);
123
124	place = &hold_text;
125
126	/* If there's an output section by this name, we'll use it, regardless
127	of section flags, in contrast to what's done in elf32.em. */
128
129	/* Start building a list of statements for this section.
130	First save the current statement pointer. */
131	old = stat_ptr;
132
133	/* Add the output section statements for this orphan to our own private
134	list, inserting them later into the global statement list. */
135	stat_ptr = &add;
136	lang_list_init (stat_ptr);
137
138	os = lang_enter_output_section_statement (bfd_get_section_name (s->owner,
139	s),
140	NULL, 0,
141	(bfd_vma) 0,
142	(etree_type *) NULL,
143	(etree_type *) NULL,
144	(etree_type *) NULL);
145
146	lang_add_section (&os->children, s, os, file);
147
148	lang_leave_output_section_statement
149	((bfd_vma) 0, "default",
150	(struct lang_output_section_phdr_list ) NULL, "default*");
151
152	/* Restore the global list pointer. */
153	stat_ptr = old;
154
155	snew = os->bfd_section;
156	bfd_section = place->os->bfd_section;
157	if (place->section == NULL && bfd_section == NULL)
158	bfd_section = output_prev_sec_find (place->os);
159
160	if (place->section != NULL
161	\|\| (bfd_section != NULL
162	&& bfd_section != snew))
163	{
164	/* Shuffle the section to make the output file look neater. This is
165	really only cosmetic. */
166	if (place->section == NULL)
167	/* Put orphans after the first section on the list. */
168	place->section = &bfd_section->next;
169
3dfe7a8c	170	/* Unlink the section. */
3c3bdf30 NC	171	for (pps = &output_bfd->sections; pps != snew; pps = &(pps)->next)
3c3bdf30 NC	172	;
3dfe7a8c	173	bfd_section_list_remove (output_bfd, pps);
3c3bdf30 NC	174
3c3bdf30 NC	175	/* Now tack it on to the "place->os" section list. */
3dfe7a8c	176	bfd_section_list_insert (output_bfd, place->section, snew);
3c3bdf30 NC	177	}
	178	place->section = &snew->next; /* Save the end of this list. */
	179
	180	if (add.head != NULL)
	181	{
	182	/* We try to put the output statements in some sort of reasonable
	183	order here, because they determine the final load addresses of
	184	the orphan sections. */
	185	if (place->stmt == NULL)
	186	{
	187	/* Put the new statement list right at the head. */
	188	*add.tail = place->os->header.next;
	189	place->os->header.next = add.head;
	190	}
	191	else
	192	{
	193	/* Put it after the last orphan statement we added. */
	194	add.tail = place->stmt;
	195	*place->stmt = add.head;
	196	}
	197
	198	/* Fix the global list pointer if we happened to tack our new list
	199	at the tail. */
	200	if (*old->tail == add.head)
	201	old->tail = add.tail;
	202
	203	/* Save the end of this list. */
	204	place->stmt = add.tail;
	205	}
	206
	207	return true;
	208	}
	209
	210	/* Remove the spurious settings of SEC_RELOC that make it to the output at
	211	link time. We are as confused as elflink.h:elf_bfd_final_link, and
	212	paper over the bug similarly. */
	213
	214	static void
	215	mmo_wipe_sec_reloc_flag (abfd, sec, ptr)
	216	bfd *abfd;
	217	asection *sec;
	218	PTR ptr ATTRIBUTE_UNUSED;
	219	{
	220	bfd_set_section_flags (abfd, sec,
	221	bfd_get_section_flags (abfd, sec) & ~SEC_RELOC);
	222	}
	223
	224	/* Iterate with bfd_map_over_sections over mmo_wipe_sec_reloc_flag... */
	225
	226	static void
	227	mmo_finish ()
	228	{
	229	bfd_map_over_sections (output_bfd, mmo_wipe_sec_reloc_flag, NULL);
	230	}
48fa4a5d HPN	231	\f
	232	/* To get on-demand global register allocation right, we need to parse the
	233	relocs, like what happens when linking to ELF. It needs to be done
	234	before all input sections are supposed to be present. When linking to
	235	ELF, it's done when reading symbols. When linking to mmo, we do it
	236	when all input files are seen, which is equivalent. */
3c3bdf30	237
48fa4a5d HPN	238	static void
	239	mmo_after_open ()
	240	{
1c5e6447 HPN	241	/* When there's a mismatch between the output format and the emulation
	242	(using weird combinations like "-m mmo --oformat elf64-mmix" for
	243	example), we'd count relocs twice because they'd also be counted
	244	along the usual route for ELF-only linking, which would lead to an
	245	internal accounting error. */
	246	if (bfd_get_flavour (output_bfd) != bfd_target_elf_flavour)
48fa4a5d	247	{
1c5e6447 HPN	248	LANG_FOR_EACH_INPUT_STATEMENT (is)
	249	{
	250	if (bfd_get_flavour (is->the_bfd) == bfd_target_elf_flavour
	251	&& !_bfd_mmix_check_all_relocs (is->the_bfd, &link_info))
	252	einfo ("%X%P: Internal problems scanning %B after opening it",
	253	is->the_bfd);
	254	}
48fa4a5d HPN	255	}
48fa4a5d HPN	256	}
3c3bdf30 NC	257	EOF
	258
	259	LDEMUL_PLACE_ORPHAN=mmo_place_orphan
	260	LDEMUL_FINISH=mmo_finish
48fa4a5d	261	LDEMUL_AFTER_OPEN=mmo_after_open