[deliverable/binutils-gdb.git] / ld / emultempl / aarch64elf.em

# This shell script emits a C file. -*- C -*-
#   Copyright (C) 2009-2014 Free Software Foundation, Inc.
#   Contributed by ARM Ltd.
#
# This file is part of the GNU Binutils.
#
# 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 3 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; see the file COPYING3. If not,
# see <http://www.gnu.org/licenses/>.
#

# This file is sourced from elf32.em, and defines extra aarch64-elf
# specific routines.
#
fragment <<EOF

#include "ldctor.h"
#include "elf/aarch64.h"

static int no_enum_size_warning = 0;
static int no_wchar_size_warning = 0;
static int pic_veneer = 0;

static void
gld${EMULATION_NAME}_before_parse (void)
{
#ifndef TARGET_			/* I.e., if not generic.  */
  ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
#endif /* not TARGET_ */
  input_flags.dynamic = ${DYNAMIC_LINK-TRUE};
  config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`;
  config.separate_code = `if test "x${SEPARATE_CODE}" = xyes ; then echo TRUE ; else echo FALSE ; fi`;
}

static void
aarch64_elf_before_allocation (void)
{
  /* We should be able to set the size of the interworking stub section.  We
     can't do it until later if we have dynamic sections, though.  */
  if (! elf_hash_table (&link_info)->dynamic_sections_created)
    {
      /* Here we rummage through the found bfds to collect information.  */
      LANG_FOR_EACH_INPUT_STATEMENT (is)
	{
          /* Initialise mapping tables for code/data.  */
          bfd_elf${ELFSIZE}_aarch64_init_maps (is->the_bfd);
	}
    }

  /* Call the standard elf routine.  */
  gld${EMULATION_NAME}_before_allocation ();
}

/* Fake input file for stubs.  */
static lang_input_statement_type *stub_file;

/* Whether we need to call gldarm_layout_sections_again.  */
static int need_laying_out = 0;

/* Maximum size of a group of input sections that can be handled by
   one stub section.  A value of +/-1 indicates the bfd back-end
   should use a suitable default size.  */
static bfd_signed_vma group_size = 1;

struct hook_stub_info
{
  lang_statement_list_type add;
  asection *input_section;
};

/* Traverse the linker tree to find the spot where the stub goes.  */

static bfd_boolean
hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
{
  lang_statement_union_type *l;
  bfd_boolean ret;

  for (; (l = *lp) != NULL; lp = &l->header.next)
    {
      switch (l->header.type)
	{
	case lang_constructors_statement_enum:
	  ret = hook_in_stub (info, &constructor_list.head);
	  if (ret)
	    return ret;
	  break;

	case lang_output_section_statement_enum:
	  ret = hook_in_stub (info,
			      &l->output_section_statement.children.head);
	  if (ret)
	    return ret;
	  break;

	case lang_wild_statement_enum:
	  ret = hook_in_stub (info, &l->wild_statement.children.head);
	  if (ret)
	    return ret;
	  break;

	case lang_group_statement_enum:
	  ret = hook_in_stub (info, &l->group_statement.children.head);
	  if (ret)
	    return ret;
	  break;

	case lang_input_section_enum:
	  if (l->input_section.section == info->input_section)
	    {
	      /* We've found our section.  Insert the stub immediately
		 after its associated input section.  */
	      *(info->add.tail) = l->header.next;
	      l->header.next = info->add.head;
	      return TRUE;
	    }
	  break;

	case lang_data_statement_enum:
	case lang_reloc_statement_enum:
	case lang_object_symbols_statement_enum:
	case lang_output_statement_enum:
	case lang_target_statement_enum:
	case lang_input_statement_enum:
	case lang_assignment_statement_enum:
	case lang_padding_statement_enum:
	case lang_address_statement_enum:
	case lang_fill_statement_enum:
	  break;

	default:
	  FAIL ();
	  break;
	}
    }
  return FALSE;
}


/* Call-back for elf${ELFSIZE}_aarch64_size_stubs.  */

/* Create a new stub section, and arrange for it to be linked
   immediately after INPUT_SECTION.  */

static asection *
elf${ELFSIZE}_aarch64_add_stub_section (const char *stub_sec_name,
				asection *input_section)
{
  asection *stub_sec;
  flagword flags;
  asection *output_section;
  lang_output_section_statement_type *os;
  struct hook_stub_info info;

  flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
	   | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
  stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
						 stub_sec_name, flags);
  if (stub_sec == NULL)
    goto err_ret;

  bfd_set_section_alignment (stub_file->the_bfd, stub_sec, 3);

  output_section = input_section->output_section;
  os = lang_output_section_get (output_section);

  info.input_section = input_section;
  lang_list_init (&info.add);
  lang_add_section (&info.add, stub_sec, NULL, os);

  if (info.add.head == NULL)
    goto err_ret;

  if (hook_in_stub (&info, &os->children.head))
    return stub_sec;

 err_ret:
  einfo ("%X%P: can not make stub section: %E\n");
  return NULL;
}

/* Another call-back for elf${ELFSIZE}_aarch64_size_stubs.  */

static void
gldaarch64_layout_sections_again (void)
{
  /* If we have changed sizes of the stub sections, then we need
     to recalculate all the section offsets.  This may mean we need to
     add even more stubs.  */
  gld${EMULATION_NAME}_map_segments (TRUE);
  need_laying_out = -1;
}

static void
build_section_lists (lang_statement_union_type *statement)
{
  if (statement->header.type == lang_input_section_enum)
    {
      asection *i = statement->input_section.section;

      if (!((lang_input_statement_type *) i->owner->usrdata)->flags.just_syms
	  && (i->flags & SEC_EXCLUDE) == 0
	  && i->output_section != NULL
	  && i->output_section->owner == link_info.output_bfd)
	elf${ELFSIZE}_aarch64_next_input_section (& link_info, i);
    }
}

static void
gld${EMULATION_NAME}_after_allocation (void)
{
  /* bfd_elf32_discard_info just plays with debugging sections,
     ie. doesn't affect any code, so we can delay resizing the
     sections.  It's likely we'll resize everything in the process of
     adding stubs.  */
  if (bfd_elf_discard_info (link_info.output_bfd, & link_info))
    need_laying_out = 1;

  /* If generating a relocatable output file, then we don't
     have to examine the relocs.  */
  if (stub_file != NULL && !link_info.relocatable)
    {
      int ret = elf${ELFSIZE}_aarch64_setup_section_lists (link_info.output_bfd,
						   & link_info);

      if (ret != 0)
	{
	  if (ret < 0)
	    {
	      einfo ("%X%P: could not compute sections lists for stub generation: %E\n");
	      return;
	    }

	  lang_for_each_statement (build_section_lists);

	  /* Call into the BFD backend to do the real work.  */
	  if (! elf${ELFSIZE}_aarch64_size_stubs (link_info.output_bfd,
					  stub_file->the_bfd,
					  & link_info,
					  group_size,
					  & elf${ELFSIZE}_aarch64_add_stub_section,
					  & gldaarch64_layout_sections_again))
	    {
	      einfo ("%X%P: cannot size stub section: %E\n");
	      return;
	    }
	}
    }

  if (need_laying_out != -1)
    gld${EMULATION_NAME}_map_segments (need_laying_out);
}

static void
gld${EMULATION_NAME}_finish (void)
{
  if (! link_info.relocatable)
    {
      /* Now build the linker stubs.  */
      if (stub_file->the_bfd->sections != NULL)
	{
	  if (! elf${ELFSIZE}_aarch64_build_stubs (& link_info))
	    einfo ("%X%P: can not build stubs: %E\n");
	}
    }

  finish_default ();
}

/* This is a convenient point to tell BFD about target specific flags.
   After the output has been created, but before inputs are read.  */
static void
aarch64_elf_create_output_section_statements (void)
{
  if (strstr (bfd_get_target (link_info.output_bfd), "aarch64") == NULL)
    {
      /* The arm backend needs special fields in the output hash structure.
	 These will only be created if the output format is an arm format,
	 hence we do not support linking and changing output formats at the
	 same time.  Use a link followed by objcopy to change output formats.  */
      einfo ("%F%X%P: error: Cannot change output format whilst linking AArch64 binaries.\n");
      return;
    }

  bfd_elf${ELFSIZE}_aarch64_set_options (link_info.output_bfd, &link_info,
				 no_enum_size_warning,
				 no_wchar_size_warning,
				 pic_veneer);

  stub_file = lang_add_input_file ("linker stubs",
				   lang_input_file_is_fake_enum,
				   NULL);
  stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
  if (stub_file->the_bfd == NULL
      || ! bfd_set_arch_mach (stub_file->the_bfd,
			      bfd_get_arch (link_info.output_bfd),
			      bfd_get_mach (link_info.output_bfd)))
    {
      einfo ("%X%P: can not create BFD %E\n");
      return;
    }

  stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
  ldlang_add_file (stub_file);
}

/* Avoid processing the fake stub_file in vercheck, stat_needed and
   check_needed routines.  */

static void (*real_func) (lang_input_statement_type *);

static void aarch64_for_each_input_file_wrapper (lang_input_statement_type *l)
{
  if (l != stub_file)
    (*real_func) (l);
}

static void
aarch64_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
{
  real_func = func;
  lang_for_each_input_file (&aarch64_for_each_input_file_wrapper);
}

#define lang_for_each_input_file aarch64_lang_for_each_input_file

EOF

# Define some shell vars to insert bits of code into the standard elf
# parse_args and list_options functions.
#
PARSE_AND_LIST_PROLOGUE='
#define OPTION_NO_ENUM_SIZE_WARNING	309
#define OPTION_PIC_VENEER		310
#define OPTION_STUBGROUP_SIZE           311
#define OPTION_NO_WCHAR_SIZE_WARNING	312
'

PARSE_AND_LIST_SHORTOPTS=p

PARSE_AND_LIST_LONGOPTS='
  { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
  { "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING},
  { "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER},
  { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
  { "no-wchar-size-warning", no_argument, NULL, OPTION_NO_WCHAR_SIZE_WARNING},
'

PARSE_AND_LIST_OPTIONS='
  fprintf (file, _("  --no-enum-size-warning      Don'\''t warn about objects with incompatible\n"
		   "                                enum sizes\n"));
  fprintf (file, _("  --no-wchar-size-warning     Don'\''t warn about objects with incompatible"
		   "                                wchar_t sizes\n"));
  fprintf (file, _("  --pic-veneer                Always generate PIC interworking veneers\n"));
  fprintf (file, _("\
   --stub-group-size=N   Maximum size of a group of input sections that can be\n\
                           handled by one stub section.  A negative value\n\
                           locates all stubs after their branches (with a\n\
                           group size of -N), while a positive value allows\n\
                           two groups of input sections, one before, and one\n\
                           after each stub section.  Values of +/-1 indicate\n\
                           the linker should choose suitable defaults.\n"
		   ));
'

PARSE_AND_LIST_ARGS_CASES='
    case '\'p\'':
      /* Only here for backwards compatibility.  */
      break;

    case OPTION_NO_ENUM_SIZE_WARNING:
      no_enum_size_warning = 1;
      break;

    case OPTION_NO_WCHAR_SIZE_WARNING:
      no_wchar_size_warning = 1;
      break;

    case OPTION_PIC_VENEER:
      pic_veneer = 1;
      break;

    case OPTION_STUBGROUP_SIZE:
      {
	const char *end;

        group_size = bfd_scan_vma (optarg, &end, 0);
        if (*end)
	  einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
      }
      break;
'

# We have our own before_allocation etc. functions, but they call
# the standard routines, so give them a different name.
LDEMUL_BEFORE_ALLOCATION=aarch64_elf_before_allocation
LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=aarch64_elf_create_output_section_statements

# Replace the elf before_parse function with our own.
LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse

# Call the extra arm-elf function
LDEMUL_FINISH=gld${EMULATION_NAME}_finish
Commit	Line	Data
a06ea964	1	# This shell script emits a C file. -- C --
4b95cf5c	2	# Copyright (C) 2009-2014 Free Software Foundation, Inc.
a06ea964 NC	3	# Contributed by ARM Ltd.
	4	#
	5	# This file is part of the GNU Binutils.
	6	#
	7	# This program is free software; you can redistribute it and/or modify
	8	# it under the terms of the GNU General Public License as published by
	9	# the Free Software Foundation; either version 3 of the license, or
	10	# (at your option) any later version.
	11	#
	12	# This program is distributed in the hope that it will be useful,
	13	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	# GNU General Public License for more details.
	16	#
	17	# You should have received a copy of the GNU General Public License
	18	# along with this program; see the file COPYING3. If not,
	19	# see <http://www.gnu.org/licenses/>.
	20	#
	21
	22	# This file is sourced from elf32.em, and defines extra aarch64-elf
	23	# specific routines.
	24	#
	25	fragment <<EOF
	26
	27	#include "ldctor.h"
	28	#include "elf/aarch64.h"
	29
	30	static int no_enum_size_warning = 0;
	31	static int no_wchar_size_warning = 0;
	32	static int pic_veneer = 0;
	33
	34	static void
	35	gld${EMULATION_NAME}_before_parse (void)
	36	{
	37	#ifndef TARGET_ /* I.e., if not generic. */
	38	ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
	39	#endif /* not TARGET_ */
	40	input_flags.dynamic = ${DYNAMIC_LINK-TRUE};
	41	config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`;
e2caaa1f	42	config.separate_code = `if test "x${SEPARATE_CODE}" = xyes ; then echo TRUE ; else echo FALSE ; fi`;
a06ea964 NC	43	}
	44
	45	static void
	46	aarch64_elf_before_allocation (void)
	47	{
	48	/* We should be able to set the size of the interworking stub section. We
	49	can't do it until later if we have dynamic sections, though. */
	50	if (! elf_hash_table (&link_info)->dynamic_sections_created)
	51	{
	52	/* Here we rummage through the found bfds to collect information. */
	53	LANG_FOR_EACH_INPUT_STATEMENT (is)
	54	{
	55	/* Initialise mapping tables for code/data. */
4390599b	56	bfd_elf${ELFSIZE}_aarch64_init_maps (is->the_bfd);
a06ea964 NC	57	}
	58	}
	59
	60	/* Call the standard elf routine. */
	61	gld${EMULATION_NAME}_before_allocation ();
	62	}
	63
	64	/* Fake input file for stubs. */
	65	static lang_input_statement_type *stub_file;
	66
	67	/* Whether we need to call gldarm_layout_sections_again. */
	68	static int need_laying_out = 0;
	69
	70	/* Maximum size of a group of input sections that can be handled by
	71	one stub section. A value of +/-1 indicates the bfd back-end
	72	should use a suitable default size. */
	73	static bfd_signed_vma group_size = 1;
	74
	75	struct hook_stub_info
	76	{
	77	lang_statement_list_type add;
	78	asection *input_section;
	79	};
	80
	81	/* Traverse the linker tree to find the spot where the stub goes. */
	82
	83	static bfd_boolean
	84	hook_in_stub (struct hook_stub_info info, lang_statement_union_type *lp)
	85	{
	86	lang_statement_union_type *l;
	87	bfd_boolean ret;
	88
	89	for (; (l = *lp) != NULL; lp = &l->header.next)
	90	{
	91	switch (l->header.type)
	92	{
	93	case lang_constructors_statement_enum:
	94	ret = hook_in_stub (info, &constructor_list.head);
	95	if (ret)
	96	return ret;
	97	break;
	98
	99	case lang_output_section_statement_enum:
	100	ret = hook_in_stub (info,
	101	&l->output_section_statement.children.head);
	102	if (ret)
	103	return ret;
	104	break;
	105
	106	case lang_wild_statement_enum:
	107	ret = hook_in_stub (info, &l->wild_statement.children.head);
	108	if (ret)
	109	return ret;
	110	break;
	111
	112	case lang_group_statement_enum:
	113	ret = hook_in_stub (info, &l->group_statement.children.head);
	114	if (ret)
	115	return ret;
	116	break;
	117
	118	case lang_input_section_enum:
	119	if (l->input_section.section == info->input_section)
	120	{
121	/* We've found our section. Insert the stub immediately
122	after its associated input section. */
123	*(info->add.tail) = l->header.next;
124	l->header.next = info->add.head;
125	return TRUE;
126	}
127	break;
128
129	case lang_data_statement_enum:
130	case lang_reloc_statement_enum:
131	case lang_object_symbols_statement_enum:
132	case lang_output_statement_enum:
133	case lang_target_statement_enum:
134	case lang_input_statement_enum:
135	case lang_assignment_statement_enum:
136	case lang_padding_statement_enum:
137	case lang_address_statement_enum:
138	case lang_fill_statement_enum:
139	break;
140
141	default:
142	FAIL ();
143	break;
144	}
145	}
146	return FALSE;
147	}
148
149
4390599b	150	/* Call-back for elf${ELFSIZE}_aarch64_size_stubs. */
a06ea964 NC	151
	152	/* Create a new stub section, and arrange for it to be linked
	153	immediately after INPUT_SECTION. */
	154
	155	static asection *
4390599b	156	elf${ELFSIZE}_aarch64_add_stub_section (const char *stub_sec_name,
a06ea964 NC	157	asection *input_section)
	158	{
	159	asection *stub_sec;
	160	flagword flags;
	161	asection *output_section;
a06ea964 NC	162	lang_output_section_statement_type *os;
	163	struct hook_stub_info info;
	164
	165	flags = (SEC_ALLOC \| SEC_LOAD \| SEC_READONLY \| SEC_CODE
	166	\| SEC_HAS_CONTENTS \| SEC_RELOC \| SEC_IN_MEMORY \| SEC_KEEP);
	167	stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
	168	stub_sec_name, flags);
	169	if (stub_sec == NULL)
	170	goto err_ret;
	171
	172	bfd_set_section_alignment (stub_file->the_bfd, stub_sec, 3);
	173
	174	output_section = input_section->output_section;
24ef1aa7	175	os = lang_output_section_get (output_section);
a06ea964 NC	176
	177	info.input_section = input_section;
	178	lang_list_init (&info.add);
	179	lang_add_section (&info.add, stub_sec, NULL, os);
	180
	181	if (info.add.head == NULL)
	182	goto err_ret;
	183
	184	if (hook_in_stub (&info, &os->children.head))
	185	return stub_sec;
	186
	187	err_ret:
	188	einfo ("%X%P: can not make stub section: %E\n");
	189	return NULL;
	190	}
	191
4390599b	192	/* Another call-back for elf${ELFSIZE}_aarch64_size_stubs. */
a06ea964 NC	193
	194	static void
	195	gldaarch64_layout_sections_again (void)
	196	{
	197	/* If we have changed sizes of the stub sections, then we need
	198	to recalculate all the section offsets. This may mean we need to
	199	add even more stubs. */
	200	gld${EMULATION_NAME}_map_segments (TRUE);
	201	need_laying_out = -1;
	202	}
	203
	204	static void
	205	build_section_lists (lang_statement_union_type *statement)
	206	{
	207	if (statement->header.type == lang_input_section_enum)
	208	{
	209	asection *i = statement->input_section.section;
	210
	211	if (!((lang_input_statement_type *) i->owner->usrdata)->flags.just_syms
	212	&& (i->flags & SEC_EXCLUDE) == 0
	213	&& i->output_section != NULL
	214	&& i->output_section->owner == link_info.output_bfd)
4390599b	215	elf${ELFSIZE}_aarch64_next_input_section (& link_info, i);
a06ea964 NC	216	}
	217	}
	218
	219	static void
	220	gld${EMULATION_NAME}_after_allocation (void)
	221	{
	222	/* bfd_elf32_discard_info just plays with debugging sections,
	223	ie. doesn't affect any code, so we can delay resizing the
	224	sections. It's likely we'll resize everything in the process of
	225	adding stubs. */
	226	if (bfd_elf_discard_info (link_info.output_bfd, & link_info))
	227	need_laying_out = 1;
	228
	229	/* If generating a relocatable output file, then we don't
	230	have to examine the relocs. */
	231	if (stub_file != NULL && !link_info.relocatable)
	232	{
4390599b	233	int ret = elf${ELFSIZE}_aarch64_setup_section_lists (link_info.output_bfd,
a06ea964 NC	234	& link_info);
	235
	236	if (ret != 0)
	237	{
	238	if (ret < 0)
	239	{
	240	einfo ("%X%P: could not compute sections lists for stub generation: %E\n");
	241	return;
	242	}
	243
	244	lang_for_each_statement (build_section_lists);
	245
	246	/* Call into the BFD backend to do the real work. */
4390599b	247	if (! elf${ELFSIZE}_aarch64_size_stubs (link_info.output_bfd,
a06ea964 NC	248	stub_file->the_bfd,
	249	& link_info,
	250	group_size,
4390599b	251	& elf${ELFSIZE}_aarch64_add_stub_section,
a06ea964 NC	252	& gldaarch64_layout_sections_again))
	253	{
	254	einfo ("%X%P: cannot size stub section: %E\n");
	255	return;
	256	}
	257	}
	258	}
	259
	260	if (need_laying_out != -1)
	261	gld${EMULATION_NAME}_map_segments (need_laying_out);
	262	}
	263
	264	static void
	265	gld${EMULATION_NAME}_finish (void)
	266	{
	267	if (! link_info.relocatable)
	268	{
	269	/* Now build the linker stubs. */
	270	if (stub_file->the_bfd->sections != NULL)
	271	{
4390599b	272	if (! elf${ELFSIZE}_aarch64_build_stubs (& link_info))
a06ea964 NC	273	einfo ("%X%P: can not build stubs: %E\n");
	274	}
	275	}
	276
	277	finish_default ();
	278	}
	279
	280	/* This is a convenient point to tell BFD about target specific flags.
	281	After the output has been created, but before inputs are read. */
	282	static void
	283	aarch64_elf_create_output_section_statements (void)
	284	{
	285	if (strstr (bfd_get_target (link_info.output_bfd), "aarch64") == NULL)
	286	{
	287	/* The arm backend needs special fields in the output hash structure.
	288	These will only be created if the output format is an arm format,
	289	hence we do not support linking and changing output formats at the
	290	same time. Use a link followed by objcopy to change output formats. */
	291	einfo ("%F%X%P: error: Cannot change output format whilst linking AArch64 binaries.\n");
	292	return;
	293	}
	294
4390599b	295	bfd_elf${ELFSIZE}_aarch64_set_options (link_info.output_bfd, &link_info,
a06ea964 NC	296	no_enum_size_warning,
	297	no_wchar_size_warning,
	298	pic_veneer);
	299
	300	stub_file = lang_add_input_file ("linker stubs",
	301	lang_input_file_is_fake_enum,
	302	NULL);
	303	stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
	304	if (stub_file->the_bfd == NULL
	305	\|\| ! bfd_set_arch_mach (stub_file->the_bfd,
	306	bfd_get_arch (link_info.output_bfd),
	307	bfd_get_mach (link_info.output_bfd)))
	308	{
	309	einfo ("%X%P: can not create BFD %E\n");
	310	return;
	311	}
	312
	313	stub_file->the_bfd->flags \|= BFD_LINKER_CREATED;
	314	ldlang_add_file (stub_file);
	315	}
	316
	317	/* Avoid processing the fake stub_file in vercheck, stat_needed and
	318	check_needed routines. */
	319
	320	static void (real_func) (lang_input_statement_type );
	321
	322	static void aarch64_for_each_input_file_wrapper (lang_input_statement_type *l)
	323	{
	324	if (l != stub_file)
	325	(*real_func) (l);
	326	}
	327
	328	static void
	329	aarch64_lang_for_each_input_file (void (func) (lang_input_statement_type ))
	330	{
	331	real_func = func;
	332	lang_for_each_input_file (&aarch64_for_each_input_file_wrapper);
	333	}
	334
	335	#define lang_for_each_input_file aarch64_lang_for_each_input_file
	336
	337	EOF
	338
	339	# Define some shell vars to insert bits of code into the standard elf
	340	# parse_args and list_options functions.
	341	#
	342	PARSE_AND_LIST_PROLOGUE='
	343	#define OPTION_NO_ENUM_SIZE_WARNING 309
	344	#define OPTION_PIC_VENEER 310
	345	#define OPTION_STUBGROUP_SIZE 311
	346	#define OPTION_NO_WCHAR_SIZE_WARNING 312
	347	'
	348
	349	PARSE_AND_LIST_SHORTOPTS=p
	350
	351	PARSE_AND_LIST_LONGOPTS='
	352	{ "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
	353	{ "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING},
	354	{ "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER},
	355	{ "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
	356	{ "no-wchar-size-warning", no_argument, NULL, OPTION_NO_WCHAR_SIZE_WARNING},
	357	'
	358
	359	PARSE_AND_LIST_OPTIONS='
360	fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible\n"
361	" enum sizes\n"));
362	fprintf (file, _(" --no-wchar-size-warning Don'\''t warn about objects with incompatible"
363	" wchar_t sizes\n"));
364	fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n"));
365	fprintf (file, _("\
366	--stub-group-size=N Maximum size of a group of input sections that can be\n\
367	handled by one stub section. A negative value\n\
368	locates all stubs after their branches (with a\n\
369	group size of -N), while a positive value allows\n\
370	two groups of input sections, one before, and one\n\
371	after each stub section. Values of +/-1 indicate\n\
372	the linker should choose suitable defaults.\n"
373	));
374	'
375
376	PARSE_AND_LIST_ARGS_CASES='
377	case '\'p\'':
378	/* Only here for backwards compatibility. */
379	break;
380
381	case OPTION_NO_ENUM_SIZE_WARNING:
382	no_enum_size_warning = 1;
383	break;
384
385	case OPTION_NO_WCHAR_SIZE_WARNING:
386	no_wchar_size_warning = 1;
387	break;
388
389	case OPTION_PIC_VENEER:
390	pic_veneer = 1;
391	break;
392
393	case OPTION_STUBGROUP_SIZE:
394	{
395	const char *end;
396
397	group_size = bfd_scan_vma (optarg, &end, 0);
398	if (*end)
399	einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
400	}
401	break;
402	'
403
404	# We have our own before_allocation etc. functions, but they call
405	# the standard routines, so give them a different name.
406	LDEMUL_BEFORE_ALLOCATION=aarch64_elf_before_allocation
407	LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
408	LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=aarch64_elf_create_output_section_statements
409
410	# Replace the elf before_parse function with our own.
411	LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
412
413	# Call the extra arm-elf function
414	LDEMUL_FINISH=gld${EMULATION_NAME}_finish