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

# This shell script emits a C file. -*- C -*-
#   Copyright (C) 2009-2015 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 int fix_erratum_835769 = 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)
{
  int ret;

  /* 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.  */
  ret = bfd_elf_discard_info (link_info.output_bfd, & link_info);
  if (ret < 0)
    {
      einfo ("%X%P: .eh_frame/.stab edit: %E\n");
      return;
    }
  else if (ret > 0)
    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)
    {
      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, fix_erratum_835769);

  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
#define OPTION_FIX_ERRATUM_835769	313
'

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},
  { "fix-cortex-a53-835769", no_argument, NULL, OPTION_FIX_ERRATUM_835769},
'

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"
		   ));
  fprintf (file, _("  --fix-cortex-a53-835769      Fix erratum 835769\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_FIX_ERRATUM_835769:
      fix_erratum_835769 = 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${EMULATION_NAME}_finish
Commit	Line	Data
a06ea964	1	# This shell script emits a C file. -- C --
b90efa5b	2	# Copyright (C) 2009-2015 Free Software Foundation, Inc.
a06ea964 NC	3	# Contributed by ARM Ltd.
	4	#
	5	# This file is part of the GNU Binutils.
	6	#
	7	# This program is free software; you can redistribute it and/or modify
	8	# it under the terms of the GNU General Public License as published by
	9	# the Free Software Foundation; either version 3 of the license, or
	10	# (at your option) any later version.
	11	#
	12	# This program is distributed in the hope that it will be useful,
	13	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	# GNU General Public License for more details.
	16	#
	17	# You should have received a copy of the GNU General Public License
	18	# along with this program; see the file COPYING3. If not,
	19	# see <http://www.gnu.org/licenses/>.
	20	#
	21
	22	# This file is sourced from elf32.em, and defines extra aarch64-elf
	23	# specific routines.
	24	#
	25	fragment <<EOF
	26
	27	#include "ldctor.h"
	28	#include "elf/aarch64.h"
	29
	30	static int no_enum_size_warning = 0;
	31	static int no_wchar_size_warning = 0;
	32	static int pic_veneer = 0;
68fcca92	33	static int fix_erratum_835769 = 0;
a06ea964 NC	34
	35	static void
	36	gld${EMULATION_NAME}_before_parse (void)
	37	{
	38	#ifndef TARGET_ /* I.e., if not generic. */
	39	ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
	40	#endif /* not TARGET_ */
	41	input_flags.dynamic = ${DYNAMIC_LINK-TRUE};
	42	config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`;
e2caaa1f	43	config.separate_code = `if test "x${SEPARATE_CODE}" = xyes ; then echo TRUE ; else echo FALSE ; fi`;
a06ea964 NC	44	}
	45
	46	static void
	47	aarch64_elf_before_allocation (void)
	48	{
	49	/* We should be able to set the size of the interworking stub section. We
	50	can't do it until later if we have dynamic sections, though. */
	51	if (! elf_hash_table (&link_info)->dynamic_sections_created)
	52	{
	53	/* Here we rummage through the found bfds to collect information. */
	54	LANG_FOR_EACH_INPUT_STATEMENT (is)
	55	{
	56	/* Initialise mapping tables for code/data. */
4390599b	57	bfd_elf${ELFSIZE}_aarch64_init_maps (is->the_bfd);
a06ea964 NC	58	}
	59	}
	60
	61	/* Call the standard elf routine. */
	62	gld${EMULATION_NAME}_before_allocation ();
	63	}
	64
	65	/* Fake input file for stubs. */
	66	static lang_input_statement_type *stub_file;
	67
	68	/* Whether we need to call gldarm_layout_sections_again. */
	69	static int need_laying_out = 0;
	70
	71	/* Maximum size of a group of input sections that can be handled by
	72	one stub section. A value of +/-1 indicates the bfd back-end
	73	should use a suitable default size. */
	74	static bfd_signed_vma group_size = 1;
	75
	76	struct hook_stub_info
	77	{
	78	lang_statement_list_type add;
	79	asection *input_section;
	80	};
	81
	82	/* Traverse the linker tree to find the spot where the stub goes. */
	83
	84	static bfd_boolean
	85	hook_in_stub (struct hook_stub_info info, lang_statement_union_type *lp)
	86	{
	87	lang_statement_union_type *l;
	88	bfd_boolean ret;
	89
	90	for (; (l = *lp) != NULL; lp = &l->header.next)
	91	{
	92	switch (l->header.type)
	93	{
	94	case lang_constructors_statement_enum:
	95	ret = hook_in_stub (info, &constructor_list.head);
	96	if (ret)
	97	return ret;
	98	break;
	99
	100	case lang_output_section_statement_enum:
	101	ret = hook_in_stub (info,
	102	&l->output_section_statement.children.head);
	103	if (ret)
	104	return ret;
	105	break;
	106
	107	case lang_wild_statement_enum:
	108	ret = hook_in_stub (info, &l->wild_statement.children.head);
	109	if (ret)
	110	return ret;
	111	break;
	112
	113	case lang_group_statement_enum:
	114	ret = hook_in_stub (info, &l->group_statement.children.head);
	115	if (ret)
	116	return ret;
	117	break;
	118
	119	case lang_input_section_enum:
	120	if (l->input_section.section == info->input_section)
	121	{
122	/* We've found our section. Insert the stub immediately
123	after its associated input section. */
124	*(info->add.tail) = l->header.next;
125	l->header.next = info->add.head;
126	return TRUE;
127	}
128	break;
129
130	case lang_data_statement_enum:
131	case lang_reloc_statement_enum:
132	case lang_object_symbols_statement_enum:
133	case lang_output_statement_enum:
134	case lang_target_statement_enum:
135	case lang_input_statement_enum:
136	case lang_assignment_statement_enum:
137	case lang_padding_statement_enum:
138	case lang_address_statement_enum:
139	case lang_fill_statement_enum:
140	break;
141
142	default:
143	FAIL ();
144	break;
145	}
146	}
147	return FALSE;
148	}
149
150
4390599b	151	/* Call-back for elf${ELFSIZE}_aarch64_size_stubs. */
a06ea964 NC	152
	153	/* Create a new stub section, and arrange for it to be linked
	154	immediately after INPUT_SECTION. */
	155
	156	static asection *
4390599b	157	elf${ELFSIZE}_aarch64_add_stub_section (const char *stub_sec_name,
a06ea964 NC	158	asection *input_section)
	159	{
	160	asection *stub_sec;
	161	flagword flags;
	162	asection *output_section;
a06ea964 NC	163	lang_output_section_statement_type *os;
	164	struct hook_stub_info info;
	165
	166	flags = (SEC_ALLOC \| SEC_LOAD \| SEC_READONLY \| SEC_CODE
	167	\| SEC_HAS_CONTENTS \| SEC_RELOC \| SEC_IN_MEMORY \| SEC_KEEP);
	168	stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
	169	stub_sec_name, flags);
	170	if (stub_sec == NULL)
	171	goto err_ret;
	172
	173	bfd_set_section_alignment (stub_file->the_bfd, stub_sec, 3);
	174
	175	output_section = input_section->output_section;
24ef1aa7	176	os = lang_output_section_get (output_section);
a06ea964 NC	177
	178	info.input_section = input_section;
	179	lang_list_init (&info.add);
	180	lang_add_section (&info.add, stub_sec, NULL, os);
	181
	182	if (info.add.head == NULL)
	183	goto err_ret;
	184
	185	if (hook_in_stub (&info, &os->children.head))
	186	return stub_sec;
	187
	188	err_ret:
	189	einfo ("%X%P: can not make stub section: %E\n");
	190	return NULL;
	191	}
	192
4390599b	193	/* Another call-back for elf${ELFSIZE}_aarch64_size_stubs. */
a06ea964 NC	194
	195	static void
	196	gldaarch64_layout_sections_again (void)
	197	{
	198	/* If we have changed sizes of the stub sections, then we need
	199	to recalculate all the section offsets. This may mean we need to
	200	add even more stubs. */
	201	gld${EMULATION_NAME}_map_segments (TRUE);
	202	need_laying_out = -1;
	203	}
	204
	205	static void
	206	build_section_lists (lang_statement_union_type *statement)
	207	{
	208	if (statement->header.type == lang_input_section_enum)
	209	{
	210	asection *i = statement->input_section.section;
	211
	212	if (!((lang_input_statement_type *) i->owner->usrdata)->flags.just_syms
	213	&& (i->flags & SEC_EXCLUDE) == 0
	214	&& i->output_section != NULL
	215	&& i->output_section->owner == link_info.output_bfd)
4390599b	216	elf${ELFSIZE}_aarch64_next_input_section (& link_info, i);
a06ea964 NC	217	}
	218	}
	219
	220	static void
	221	gld${EMULATION_NAME}_after_allocation (void)
	222	{
75938853 AM	223	int ret;
75938853 AM	224
a06ea964 NC	225	/* bfd_elf32_discard_info just plays with debugging sections,
	226	ie. doesn't affect any code, so we can delay resizing the
	227	sections. It's likely we'll resize everything in the process of
	228	adding stubs. */
75938853 AM	229	ret = bfd_elf_discard_info (link_info.output_bfd, & link_info);
	230	if (ret < 0)
	231	{
	232	einfo ("%X%P: .eh_frame/.stab edit: %E\n");
	233	return;
	234	}
	235	else if (ret > 0)
a06ea964 NC	236	need_laying_out = 1;
	237
	238	/* If generating a relocatable output file, then we don't
	239	have to examine the relocs. */
	240	if (stub_file != NULL && !link_info.relocatable)
	241	{
75938853 AM	242	ret = elf${ELFSIZE}_aarch64_setup_section_lists (link_info.output_bfd,
75938853 AM	243	&link_info);
a06ea964 NC	244	if (ret != 0)
	245	{
	246	if (ret < 0)
	247	{
	248	einfo ("%X%P: could not compute sections lists for stub generation: %E\n");
	249	return;
	250	}
	251
	252	lang_for_each_statement (build_section_lists);
	253
	254	/* Call into the BFD backend to do the real work. */
4390599b	255	if (! elf${ELFSIZE}_aarch64_size_stubs (link_info.output_bfd,
a06ea964 NC	256	stub_file->the_bfd,
	257	& link_info,
	258	group_size,
4390599b	259	& elf${ELFSIZE}_aarch64_add_stub_section,
a06ea964 NC	260	& gldaarch64_layout_sections_again))
	261	{
	262	einfo ("%X%P: cannot size stub section: %E\n");
	263	return;
	264	}
	265	}
	266	}
	267
	268	if (need_laying_out != -1)
	269	gld${EMULATION_NAME}_map_segments (need_laying_out);
	270	}
	271
	272	static void
	273	gld${EMULATION_NAME}_finish (void)
	274	{
	275	if (! link_info.relocatable)
	276	{
	277	/* Now build the linker stubs. */
	278	if (stub_file->the_bfd->sections != NULL)
	279	{
4390599b	280	if (! elf${ELFSIZE}_aarch64_build_stubs (& link_info))
a06ea964 NC	281	einfo ("%X%P: can not build stubs: %E\n");
	282	}
	283	}
	284
	285	finish_default ();
	286	}
	287
	288	/* This is a convenient point to tell BFD about target specific flags.
	289	After the output has been created, but before inputs are read. */
	290	static void
	291	aarch64_elf_create_output_section_statements (void)
	292	{
	293	if (strstr (bfd_get_target (link_info.output_bfd), "aarch64") == NULL)
	294	{
	295	/* The arm backend needs special fields in the output hash structure.
	296	These will only be created if the output format is an arm format,
	297	hence we do not support linking and changing output formats at the
	298	same time. Use a link followed by objcopy to change output formats. */
	299	einfo ("%F%X%P: error: Cannot change output format whilst linking AArch64 binaries.\n");
	300	return;
	301	}
	302
4390599b	303	bfd_elf${ELFSIZE}_aarch64_set_options (link_info.output_bfd, &link_info,
a06ea964 NC	304	no_enum_size_warning,
a06ea964 NC	305	no_wchar_size_warning,
68fcca92	306	pic_veneer, fix_erratum_835769);
a06ea964 NC	307
	308	stub_file = lang_add_input_file ("linker stubs",
	309	lang_input_file_is_fake_enum,
	310	NULL);
	311	stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
	312	if (stub_file->the_bfd == NULL
	313	\|\| ! bfd_set_arch_mach (stub_file->the_bfd,
	314	bfd_get_arch (link_info.output_bfd),
	315	bfd_get_mach (link_info.output_bfd)))
	316	{
	317	einfo ("%X%P: can not create BFD %E\n");
	318	return;
	319	}
	320
	321	stub_file->the_bfd->flags \|= BFD_LINKER_CREATED;
	322	ldlang_add_file (stub_file);
	323	}
	324
	325	/* Avoid processing the fake stub_file in vercheck, stat_needed and
	326	check_needed routines. */
	327
	328	static void (real_func) (lang_input_statement_type );
	329
	330	static void aarch64_for_each_input_file_wrapper (lang_input_statement_type *l)
	331	{
	332	if (l != stub_file)
	333	(*real_func) (l);
	334	}
	335
	336	static void
	337	aarch64_lang_for_each_input_file (void (func) (lang_input_statement_type ))
	338	{
	339	real_func = func;
	340	lang_for_each_input_file (&aarch64_for_each_input_file_wrapper);
	341	}
	342
	343	#define lang_for_each_input_file aarch64_lang_for_each_input_file
	344
	345	EOF
	346
	347	# Define some shell vars to insert bits of code into the standard elf
	348	# parse_args and list_options functions.
	349	#
	350	PARSE_AND_LIST_PROLOGUE='
	351	#define OPTION_NO_ENUM_SIZE_WARNING 309
	352	#define OPTION_PIC_VENEER 310
	353	#define OPTION_STUBGROUP_SIZE 311
	354	#define OPTION_NO_WCHAR_SIZE_WARNING 312
68fcca92	355	#define OPTION_FIX_ERRATUM_835769 313
a06ea964 NC	356	'
	357
	358	PARSE_AND_LIST_SHORTOPTS=p
	359
	360	PARSE_AND_LIST_LONGOPTS='
	361	{ "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
	362	{ "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING},
	363	{ "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER},
	364	{ "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
	365	{ "no-wchar-size-warning", no_argument, NULL, OPTION_NO_WCHAR_SIZE_WARNING},
68fcca92	366	{ "fix-cortex-a53-835769", no_argument, NULL, OPTION_FIX_ERRATUM_835769},
a06ea964 NC	367	'
	368
	369	PARSE_AND_LIST_OPTIONS='
	370	fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible\n"
	371	" enum sizes\n"));
	372	fprintf (file, _(" --no-wchar-size-warning Don'\''t warn about objects with incompatible"
	373	" wchar_t sizes\n"));
	374	fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n"));
	375	fprintf (file, _("\
	376	--stub-group-size=N Maximum size of a group of input sections that can be\n\
	377	handled by one stub section. A negative value\n\
	378	locates all stubs after their branches (with a\n\
	379	group size of -N), while a positive value allows\n\
	380	two groups of input sections, one before, and one\n\
	381	after each stub section. Values of +/-1 indicate\n\
	382	the linker should choose suitable defaults.\n"
	383	));
68fcca92	384	fprintf (file, _(" --fix-cortex-a53-835769 Fix erratum 835769\n"));
a06ea964 NC	385	'
	386
	387	PARSE_AND_LIST_ARGS_CASES='
	388	case '\'p\'':
	389	/* Only here for backwards compatibility. */
	390	break;
	391
	392	case OPTION_NO_ENUM_SIZE_WARNING:
	393	no_enum_size_warning = 1;
	394	break;
	395
	396	case OPTION_NO_WCHAR_SIZE_WARNING:
	397	no_wchar_size_warning = 1;
	398	break;
	399
	400	case OPTION_PIC_VENEER:
	401	pic_veneer = 1;
	402	break;
	403
68fcca92 JW	404	case OPTION_FIX_ERRATUM_835769:
	405	fix_erratum_835769 = 1;
	406	break;
	407
a06ea964 NC	408	case OPTION_STUBGROUP_SIZE:
	409	{
	410	const char *end;
	411
	412	group_size = bfd_scan_vma (optarg, &end, 0);
	413	if (*end)
	414	einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
	415	}
	416	break;
	417	'
	418
	419	# We have our own before_allocation etc. functions, but they call
	420	# the standard routines, so give them a different name.
	421	LDEMUL_BEFORE_ALLOCATION=aarch64_elf_before_allocation
	422	LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
	423	LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=aarch64_elf_create_output_section_statements
	424
	425	# Replace the elf before_parse function with our own.
	426	LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
	427
	428	# Call the extra arm-elf function
	429	LDEMUL_FINISH=gld${EMULATION_NAME}_finish