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

# This shell script emits a C file. -*- C -*-
#   Copyright 2001, 2002, 2003 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 bfd_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 bfd_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.relocatable
      || (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);
}
\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 --
1049f94e	2	# Copyright 2001, 2002, 2003 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
b34976b6	35	static bfd_boolean mmo_place_orphan
3c3bdf30 NC	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
b34976b6	87	static bfd_boolean
3c3bdf30 NC	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. */
1049f94e	100	if (link_info.relocatable
3c3bdf30 NC	101	\|\| (bfd_get_section_flags (s->owner, s)
3c3bdf30 NC	102	& (SEC_EXCLUDE \| SEC_LOAD)) != SEC_LOAD)
b34976b6	103	return FALSE;
3c3bdf30 NC	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);
b34976b6	113	return TRUE;
3c3bdf30 NC	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)
b34976b6	119	return FALSE;
3c3bdf30 NC	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",
ee3cc2e2	150	(struct lang_output_section_phdr_list *) NULL, NULL);
3c3bdf30 NC	151
	152	/* Restore the global list pointer. */
	153	stat_ptr = old;
	154
25844aae AM	155	snew = os->bfd_section;
	156	if (snew == NULL)
	157	/* /DISCARD/ section. */
b34976b6	158	return TRUE;
25844aae	159
3595bd6e HPN	160	/* We need an output section for .text as a root, so if there was none
	161	(might happen with a peculiar linker script such as in "map
	162	addresses", map-address.exp), we grab the output section created
	163	above. */
	164	if (hold_text.os == NULL)
	165	{
	166	if (os == NULL)
b34976b6	167	return FALSE;
3595bd6e HPN	168	hold_text.os = os;
	169	}
	170
3c3bdf30 NC	171	bfd_section = place->os->bfd_section;
	172	if (place->section == NULL && bfd_section == NULL)
	173	bfd_section = output_prev_sec_find (place->os);
	174
	175	if (place->section != NULL
	176	\|\| (bfd_section != NULL
	177	&& bfd_section != snew))
	178	{
	179	/* Shuffle the section to make the output file look neater. This is
	180	really only cosmetic. */
	181	if (place->section == NULL)
	182	/* Put orphans after the first section on the list. */
	183	place->section = &bfd_section->next;
	184
3dfe7a8c	185	/* Unlink the section. */
3c3bdf30 NC	186	for (pps = &output_bfd->sections; pps != snew; pps = &(pps)->next)
3c3bdf30 NC	187	;
3dfe7a8c	188	bfd_section_list_remove (output_bfd, pps);
3c3bdf30 NC	189
3c3bdf30 NC	190	/* Now tack it on to the "place->os" section list. */
3dfe7a8c	191	bfd_section_list_insert (output_bfd, place->section, snew);
3c3bdf30 NC	192	}
	193	place->section = &snew->next; /* Save the end of this list. */
	194
	195	if (add.head != NULL)
	196	{
	197	/* We try to put the output statements in some sort of reasonable
	198	order here, because they determine the final load addresses of
	199	the orphan sections. */
	200	if (place->stmt == NULL)
	201	{
	202	/* Put the new statement list right at the head. */
	203	*add.tail = place->os->header.next;
	204	place->os->header.next = add.head;
	205	}
	206	else
	207	{
	208	/* Put it after the last orphan statement we added. */
	209	add.tail = place->stmt;
	210	*place->stmt = add.head;
	211	}
	212
	213	/* Fix the global list pointer if we happened to tack our new list
	214	at the tail. */
	215	if (*old->tail == add.head)
	216	old->tail = add.tail;
	217
	218	/* Save the end of this list. */
	219	place->stmt = add.tail;
	220	}
	221
b34976b6	222	return TRUE;
3c3bdf30 NC	223	}
	224
	225	/* Remove the spurious settings of SEC_RELOC that make it to the output at
	226	link time. We are as confused as elflink.h:elf_bfd_final_link, and
	227	paper over the bug similarly. */
	228
	229	static void
	230	mmo_wipe_sec_reloc_flag (abfd, sec, ptr)
	231	bfd *abfd;
	232	asection *sec;
	233	PTR ptr ATTRIBUTE_UNUSED;
	234	{
	235	bfd_set_section_flags (abfd, sec,
	236	bfd_get_section_flags (abfd, sec) & ~SEC_RELOC);
	237	}
	238
	239	/* Iterate with bfd_map_over_sections over mmo_wipe_sec_reloc_flag... */
	240
	241	static void
	242	mmo_finish ()
	243	{
	244	bfd_map_over_sections (output_bfd, mmo_wipe_sec_reloc_flag, NULL);
	245	}
48fa4a5d HPN	246	\f
	247	/* To get on-demand global register allocation right, we need to parse the
	248	relocs, like what happens when linking to ELF. It needs to be done
	249	before all input sections are supposed to be present. When linking to
	250	ELF, it's done when reading symbols. When linking to mmo, we do it
	251	when all input files are seen, which is equivalent. */
3c3bdf30	252
48fa4a5d HPN	253	static void
	254	mmo_after_open ()
	255	{
1c5e6447 HPN	256	/* When there's a mismatch between the output format and the emulation
	257	(using weird combinations like "-m mmo --oformat elf64-mmix" for
	258	example), we'd count relocs twice because they'd also be counted
	259	along the usual route for ELF-only linking, which would lead to an
	260	internal accounting error. */
	261	if (bfd_get_flavour (output_bfd) != bfd_target_elf_flavour)
48fa4a5d	262	{
1c5e6447 HPN	263	LANG_FOR_EACH_INPUT_STATEMENT (is)
	264	{
	265	if (bfd_get_flavour (is->the_bfd) == bfd_target_elf_flavour
	266	&& !_bfd_mmix_check_all_relocs (is->the_bfd, &link_info))
	267	einfo ("%X%P: Internal problems scanning %B after opening it",
	268	is->the_bfd);
	269	}
48fa4a5d HPN	270	}
48fa4a5d HPN	271	}
3c3bdf30 NC	272	EOF
	273
	274	LDEMUL_PLACE_ORPHAN=mmo_place_orphan
	275	LDEMUL_FINISH=mmo_finish
48fa4a5d	276	LDEMUL_AFTER_OPEN=mmo_after_open