[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 == 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);

  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;
	50	if (lookup == os)
	51	break;
	52	if (lookup->bfd_section != NULL
	53	&& lookup->bfd_section != bfd_abs_section_ptr
	54	&& lookup->bfd_section != bfd_com_section_ptr
	55	&& lookup->bfd_section != bfd_und_section_ptr)
	56	s = lookup->bfd_section;
	57	}
	58
	59	if (u == NULL)
	60	return NULL;
	61
	62	return s;
	63	}
	64
	65	struct orphan_save {
	66	lang_output_section_statement_type *os;
	67	asection **section;
	68	lang_statement_union_type **stmt;
	69	};
	70
	71	#define HAVE_SECTION(hold, name) \
	72	(hold.os != NULL \|\| (hold.os = lang_output_section_find (name)) != NULL)
	73
	74	/* Place an orphan section. We use this to put random SEC_CODE or
	75	SEC_READONLY sections right after MMO_TEXT_SECTION_NAME. Much borrowed
	76	from elf32.em. */
	77
b34976b6	78	static bfd_boolean
0c7a8e5a	79	mmo_place_orphan (lang_input_statement_type file, asection s)
3c3bdf30 NC	80	{
	81	static struct orphan_save hold_text;
	82	struct orphan_save *place;
	83	lang_output_section_statement_type *os;
	84	lang_statement_list_type *old;
	85	lang_statement_list_type add;
	86	asection snew, pps, bfd_section;
	87
	88	/* We have nothing to say for anything other than a final link. */
1049f94e	89	if (link_info.relocatable
3c3bdf30 NC	90	\|\| (bfd_get_section_flags (s->owner, s)
3c3bdf30 NC	91	& (SEC_EXCLUDE \| SEC_LOAD)) != SEC_LOAD)
b34976b6	92	return FALSE;
3c3bdf30 NC	93
	94	/* Only care for sections we're going to load. */
	95	os = lang_output_section_find (bfd_get_section_name (s->owner, s));
	96
	97	/* We have an output section by this name. Place the section inside it
	98	(regardless of whether the linker script lists it as input). */
	99	if (os != NULL)
	100	{
	101	lang_add_section (&os->children, s, os, file);
b34976b6	102	return TRUE;
3c3bdf30 NC	103	}
	104
	105	/* If this section does not have .text-type section flags or there's no
	106	MMO_TEXT_SECTION_NAME, we don't have anything to say. */
	107	if ((bfd_get_section_flags (s->owner, s) & (SEC_CODE \| SEC_READONLY)) == 0)
b34976b6	108	return FALSE;
3c3bdf30 NC	109
	110	if (hold_text.os == NULL)
	111	hold_text.os = lang_output_section_find (MMO_TEXT_SECTION_NAME);
	112
	113	place = &hold_text;
	114
	115	/* If there's an output section by this name, we'll use it, regardless
	116	of section flags, in contrast to what's done in elf32.em. */
	117
	118	/* Start building a list of statements for this section.
	119	First save the current statement pointer. */
	120	old = stat_ptr;
	121
	122	/* Add the output section statements for this orphan to our own private
	123	list, inserting them later into the global statement list. */
	124	stat_ptr = &add;
	125	lang_list_init (stat_ptr);
	126
	127	os = lang_enter_output_section_statement (bfd_get_section_name (s->owner,
	128	s),
	129	NULL, 0,
3c3bdf30 NC	130	(etree_type *) NULL,
	131	(etree_type *) NULL,
	132	(etree_type *) NULL);
	133
	134	lang_add_section (&os->children, s, os, file);
	135
	136	lang_leave_output_section_statement
	137	((bfd_vma) 0, "default",
ee3cc2e2	138	(struct lang_output_section_phdr_list *) NULL, NULL);
3c3bdf30 NC	139
	140	/* Restore the global list pointer. */
	141	stat_ptr = old;
	142
25844aae AM	143	snew = os->bfd_section;
	144	if (snew == NULL)
	145	/* /DISCARD/ section. */
b34976b6	146	return TRUE;
25844aae	147
3595bd6e HPN	148	/* We need an output section for .text as a root, so if there was none
	149	(might happen with a peculiar linker script such as in "map
	150	addresses", map-address.exp), we grab the output section created
	151	above. */
	152	if (hold_text.os == NULL)
	153	{
	154	if (os == NULL)
b34976b6	155	return FALSE;
3595bd6e HPN	156	hold_text.os = os;
	157	}
	158
3c3bdf30 NC	159	bfd_section = place->os->bfd_section;
	160	if (place->section == NULL && bfd_section == NULL)
	161	bfd_section = output_prev_sec_find (place->os);
	162
	163	if (place->section != NULL
	164	\|\| (bfd_section != NULL
	165	&& bfd_section != snew))
	166	{
	167	/* Shuffle the section to make the output file look neater. This is
	168	really only cosmetic. */
	169	if (place->section == NULL)
	170	/* Put orphans after the first section on the list. */
	171	place->section = &bfd_section->next;
	172
3dfe7a8c	173	/* Unlink the section. */
3c3bdf30 NC	174	for (pps = &output_bfd->sections; pps != snew; pps = &(pps)->next)
3c3bdf30 NC	175	;
3dfe7a8c	176	bfd_section_list_remove (output_bfd, pps);
3c3bdf30 NC	177
3c3bdf30 NC	178	/* Now tack it on to the "place->os" section list. */
3dfe7a8c	179	bfd_section_list_insert (output_bfd, place->section, snew);
3c3bdf30 NC	180	}
	181	place->section = &snew->next; /* Save the end of this list. */
	182
	183	if (add.head != NULL)
	184	{
	185	/* We try to put the output statements in some sort of reasonable
	186	order here, because they determine the final load addresses of
	187	the orphan sections. */
	188	if (place->stmt == NULL)
	189	{
	190	/* Put the new statement list right at the head. */
	191	*add.tail = place->os->header.next;
	192	place->os->header.next = add.head;
	193	}
	194	else
	195	{
	196	/* Put it after the last orphan statement we added. */
	197	add.tail = place->stmt;
	198	*place->stmt = add.head;
	199	}
	200
	201	/* Fix the global list pointer if we happened to tack our new list
	202	at the tail. */
	203	if (*old->tail == add.head)
	204	old->tail = add.tail;
	205
	206	/* Save the end of this list. */
	207	place->stmt = add.tail;
	208	}
	209
b34976b6	210	return TRUE;
3c3bdf30 NC	211	}
	212
	213	/* Remove the spurious settings of SEC_RELOC that make it to the output at
	214	link time. We are as confused as elflink.h:elf_bfd_final_link, and
	215	paper over the bug similarly. */
	216
	217	static void
0c7a8e5a	218	mmo_wipe_sec_reloc_flag (bfd abfd, asection sec, void *ptr ATTRIBUTE_UNUSED)
3c3bdf30 NC	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
0c7a8e5a	227	mmo_finish (void)
3c3bdf30 NC	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	238	static void
0c7a8e5a	239	mmo_after_open (void)
48fa4a5d	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