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

# This shell script emits a C file. -*- C -*-
#   Copyright 2001, 2002, 2003, 2004 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

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

static asection *
output_prev_sec_find (lang_output_section_statement_type *os)
{
  asection *s = 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->constraint == -1)
	continue;
      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 (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,
					    (etree_type *) NULL,
					    (etree_type *) NULL,
					    (etree_type *) NULL, 0);

  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 (bfd *abfd, asection *sec, void *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 (void)
{
  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 (void)
{
  /* 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 --
e5caa5e0	2	# Copyright 2001, 2002, 2003, 2004 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
3c3bdf30 NC	35	/* Find the last output section before given output statement.
	36	Used by place_orphan. */
	37
	38	static asection *
0c7a8e5a	39	output_prev_sec_find (lang_output_section_statement_type *os)
3c3bdf30	40	{
0c7a8e5a	41	asection *s = NULL;
3c3bdf30 NC	42	lang_statement_union_type *u;
	43	lang_output_section_statement_type *lookup;
	44
	45	for (u = lang_output_section_statement.head;
	46	u != (lang_statement_union_type *) NULL;
	47	u = lookup->next)
	48	{
	49	lookup = &u->output_section_statement;
0841712e JJ	50	if (lookup->constraint == -1)
0841712e JJ	51	continue;
3c3bdf30 NC	52	if (lookup == os)
	53	break;
	54	if (lookup->bfd_section != NULL
	55	&& lookup->bfd_section != bfd_abs_section_ptr
	56	&& lookup->bfd_section != bfd_com_section_ptr
	57	&& lookup->bfd_section != bfd_und_section_ptr)
	58	s = lookup->bfd_section;
	59	}
	60
	61	if (u == NULL)
	62	return NULL;
	63
	64	return s;
	65	}
	66
	67	struct orphan_save {
	68	lang_output_section_statement_type *os;
	69	asection **section;
	70	lang_statement_union_type **stmt;
	71	};
	72
	73	#define HAVE_SECTION(hold, name) \
	74	(hold.os != NULL \|\| (hold.os = lang_output_section_find (name)) != NULL)
	75
	76	/* Place an orphan section. We use this to put random SEC_CODE or
	77	SEC_READONLY sections right after MMO_TEXT_SECTION_NAME. Much borrowed
	78	from elf32.em. */
	79
b34976b6	80	static bfd_boolean
0c7a8e5a	81	mmo_place_orphan (lang_input_statement_type file, asection s)
3c3bdf30 NC	82	{
	83	static struct orphan_save hold_text;
	84	struct orphan_save *place;
	85	lang_output_section_statement_type *os;
	86	lang_statement_list_type *old;
	87	lang_statement_list_type add;
	88	asection snew, pps, bfd_section;
	89
	90	/* We have nothing to say for anything other than a final link. */
1049f94e	91	if (link_info.relocatable
3c3bdf30 NC	92	\|\| (bfd_get_section_flags (s->owner, s)
3c3bdf30 NC	93	& (SEC_EXCLUDE \| SEC_LOAD)) != SEC_LOAD)
b34976b6	94	return FALSE;
3c3bdf30 NC	95
	96	/* Only care for sections we're going to load. */
	97	os = lang_output_section_find (bfd_get_section_name (s->owner, s));
	98
	99	/* We have an output section by this name. Place the section inside it
	100	(regardless of whether the linker script lists it as input). */
	101	if (os != NULL)
	102	{
	103	lang_add_section (&os->children, s, os, file);
b34976b6	104	return TRUE;
3c3bdf30 NC	105	}
	106
	107	/* If this section does not have .text-type section flags or there's no
	108	MMO_TEXT_SECTION_NAME, we don't have anything to say. */
	109	if ((bfd_get_section_flags (s->owner, s) & (SEC_CODE \| SEC_READONLY)) == 0)
b34976b6	110	return FALSE;
3c3bdf30 NC	111
	112	if (hold_text.os == NULL)
	113	hold_text.os = lang_output_section_find (MMO_TEXT_SECTION_NAME);
	114
	115	place = &hold_text;
	116
	117	/* If there's an output section by this name, we'll use it, regardless
	118	of section flags, in contrast to what's done in elf32.em. */
	119
	120	/* Start building a list of statements for this section.
	121	First save the current statement pointer. */
	122	old = stat_ptr;
	123
	124	/* Add the output section statements for this orphan to our own private
	125	list, inserting them later into the global statement list. */
	126	stat_ptr = &add;
	127	lang_list_init (stat_ptr);
	128
	129	os = lang_enter_output_section_statement (bfd_get_section_name (s->owner,
	130	s),
	131	NULL, 0,
3c3bdf30 NC	132	(etree_type *) NULL,
3c3bdf30 NC	133	(etree_type *) NULL,
0841712e	134	(etree_type *) NULL, 0);
3c3bdf30 NC	135
	136	lang_add_section (&os->children, s, os, file);
	137
	138	lang_leave_output_section_statement
	139	((bfd_vma) 0, "default",
ee3cc2e2	140	(struct lang_output_section_phdr_list *) NULL, NULL);
3c3bdf30 NC	141
	142	/* Restore the global list pointer. */
	143	stat_ptr = old;
	144
25844aae AM	145	snew = os->bfd_section;
	146	if (snew == NULL)
	147	/* /DISCARD/ section. */
b34976b6	148	return TRUE;
25844aae	149
3595bd6e HPN	150	/* We need an output section for .text as a root, so if there was none
	151	(might happen with a peculiar linker script such as in "map
	152	addresses", map-address.exp), we grab the output section created
	153	above. */
	154	if (hold_text.os == NULL)
	155	{
	156	if (os == NULL)
b34976b6	157	return FALSE;
3595bd6e HPN	158	hold_text.os = os;
	159	}
	160
3c3bdf30 NC	161	bfd_section = place->os->bfd_section;
	162	if (place->section == NULL && bfd_section == NULL)
	163	bfd_section = output_prev_sec_find (place->os);
	164
	165	if (place->section != NULL
	166	\|\| (bfd_section != NULL
	167	&& bfd_section != snew))
	168	{
	169	/* Shuffle the section to make the output file look neater. This is
	170	really only cosmetic. */
	171	if (place->section == NULL)
	172	/* Put orphans after the first section on the list. */
	173	place->section = &bfd_section->next;
	174
3dfe7a8c	175	/* Unlink the section. */
3c3bdf30 NC	176	for (pps = &output_bfd->sections; pps != snew; pps = &(pps)->next)
3c3bdf30 NC	177	;
3dfe7a8c	178	bfd_section_list_remove (output_bfd, pps);
3c3bdf30 NC	179
3c3bdf30 NC	180	/* Now tack it on to the "place->os" section list. */
3dfe7a8c	181	bfd_section_list_insert (output_bfd, place->section, snew);
3c3bdf30 NC	182	}
	183	place->section = &snew->next; /* Save the end of this list. */
	184
	185	if (add.head != NULL)
	186	{
	187	/* We try to put the output statements in some sort of reasonable
	188	order here, because they determine the final load addresses of
	189	the orphan sections. */
	190	if (place->stmt == NULL)
	191	{
	192	/* Put the new statement list right at the head. */
	193	*add.tail = place->os->header.next;
	194	place->os->header.next = add.head;
	195	}
	196	else
	197	{
	198	/* Put it after the last orphan statement we added. */
	199	add.tail = place->stmt;
	200	*place->stmt = add.head;
	201	}
	202
	203	/* Fix the global list pointer if we happened to tack our new list
	204	at the tail. */
	205	if (*old->tail == add.head)
	206	old->tail = add.tail;
	207
	208	/* Save the end of this list. */
	209	place->stmt = add.tail;
	210	}
	211
b34976b6	212	return TRUE;
3c3bdf30 NC	213	}
	214
	215	/* Remove the spurious settings of SEC_RELOC that make it to the output at
	216	link time. We are as confused as elflink.h:elf_bfd_final_link, and
	217	paper over the bug similarly. */
	218
	219	static void
0c7a8e5a	220	mmo_wipe_sec_reloc_flag (bfd abfd, asection sec, void *ptr ATTRIBUTE_UNUSED)
3c3bdf30 NC	221	{
	222	bfd_set_section_flags (abfd, sec,
	223	bfd_get_section_flags (abfd, sec) & ~SEC_RELOC);
	224	}
	225
	226	/* Iterate with bfd_map_over_sections over mmo_wipe_sec_reloc_flag... */
	227
	228	static void
0c7a8e5a	229	mmo_finish (void)
3c3bdf30 NC	230	{
	231	bfd_map_over_sections (output_bfd, mmo_wipe_sec_reloc_flag, NULL);
	232	}
48fa4a5d HPN	233	\f
	234	/* To get on-demand global register allocation right, we need to parse the
	235	relocs, like what happens when linking to ELF. It needs to be done
	236	before all input sections are supposed to be present. When linking to
	237	ELF, it's done when reading symbols. When linking to mmo, we do it
	238	when all input files are seen, which is equivalent. */
3c3bdf30	239
48fa4a5d	240	static void
0c7a8e5a	241	mmo_after_open (void)
48fa4a5d	242	{
1c5e6447 HPN	243	/* When there's a mismatch between the output format and the emulation
	244	(using weird combinations like "-m mmo --oformat elf64-mmix" for
	245	example), we'd count relocs twice because they'd also be counted
	246	along the usual route for ELF-only linking, which would lead to an
	247	internal accounting error. */
	248	if (bfd_get_flavour (output_bfd) != bfd_target_elf_flavour)
48fa4a5d	249	{
1c5e6447 HPN	250	LANG_FOR_EACH_INPUT_STATEMENT (is)
	251	{
	252	if (bfd_get_flavour (is->the_bfd) == bfd_target_elf_flavour
	253	&& !_bfd_mmix_check_all_relocs (is->the_bfd, &link_info))
	254	einfo ("%X%P: Internal problems scanning %B after opening it",
	255	is->the_bfd);
	256	}
48fa4a5d HPN	257	}
48fa4a5d HPN	258	}
3c3bdf30 NC	259	EOF
	260
	261	LDEMUL_PLACE_ORPHAN=mmo_place_orphan
	262	LDEMUL_FINISH=mmo_finish
48fa4a5d	263	LDEMUL_AFTER_OPEN=mmo_after_open