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

# This shell script emits a C file. -*- C -*-
#   Copyright (C) 2009-2019 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 elf.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 erratum_84319_opts fix_erratum_843419 = ERRAT_NONE;
static int no_apply_dynamic_relocs = 0;
static aarch64_plt_type plt_type = PLT_NORMAL;
static aarch64_enable_bti_type bti_type = BTI_NONE;

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`;
  link_info.check_relocs_after_open_input = TRUE;
  link_info.relro = DEFAULT_LD_Z_RELRO;
}

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_LINKER_CREATED
	   | 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;

  /* Long branch stubs contain a 64-bit address, so the section requires
     8 byte alignment.  */
  bfd_set_section_alignment (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.  */
  ldelf_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 (!bfd_input_just_syms (i->owner)
	  && (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 && !bfd_link_relocatable (&link_info))
    {
      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: can not size stub section: %E\n"));
	      return;
	    }
	}
    }

  if (need_laying_out != -1)
    ldelf_map_segments (need_laying_out);
}

static void
gld${EMULATION_NAME}_finish (void)
{
  if (!bfd_link_relocatable (&link_info))
    {
      /* Now build the linker stubs.  */
      if (stub_file->the_bfd->sections != NULL)
	{
	  if (! elf${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%P: error: cannot change output format "
	       "whilst linking %s binaries\n"), "AArch64");
      return;
    }

  aarch64_bti_pac_info bp_info;
  bp_info.plt_type = plt_type;
  bp_info.bti_type = bti_type;

  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, fix_erratum_843419,
				 no_apply_dynamic_relocs,
				 bp_info);

  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 (_("%F%P: can not create BFD: %E\n"));
      return;
    }

  stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
  ldlang_add_file (stub_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
#define OPTION_FIX_ERRATUM_843419	314
#define OPTION_NO_APPLY_DYNAMIC_RELOCS	315
'

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},
  { "fix-cortex-a53-843419", optional_argument, NULL, OPTION_FIX_ERRATUM_843419},
  { "no-apply-dynamic-relocs", no_argument, NULL, OPTION_NO_APPLY_DYNAMIC_RELOCS},
'

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\n"
		   "                                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\n\
                                can be handled by one stub section.  A negative\n\
                                value locates all stubs after their branches\n\
                                (with a group size of -N), while a positive\n\
                                value allows two groups of input sections, one\n\
                                before, and one after each stub section.\n\
                                Values of +/-1 indicate the linker should\n\
                                choose suitable defaults.\n"));
  fprintf (file, _("  --fix-cortex-a53-835769      Fix erratum 835769\n"));
  fprintf (file, _("\
  --fix-cortex-a53-843419[=full|adr|adrp]      Fix erratum 843419 and optionally specify which workaround to use.\n\
                                               full (default): Use both ADRP and ADR workaround, this will \n\
                                                 increase the size of your binaries.\n\
                                               adr: Only use the ADR workaround, this will not cause any increase\n\
                                                 in binary size but linking will fail if the referenced address is\n\
                                                 out of range of an ADR instruction.  This will remove the need of using\n\
                                                 a veneer and results in both performance and size benefits.\n\
                                               adrp: Use only the ADRP workaround, this will never rewrite your ADRP\n\
                                                 instruction into an ADR.  As such the workaround will always use a\n\
                                                 veneer and this will give you both a performance and size overhead.\n"));
  fprintf (file, _("  --no-apply-dynamic-relocs    Do not apply link-time values for dynamic relocations\n"));
  fprintf (file, _("  -z force-bti                  Turn on Branch Target Identification mechanism and generate PLTs with BTI. Generate warnings for missing BTI on inputs\n"));
  fprintf (file, _("  -z pac-plt                    Protect PLTs with Pointer Authentication.\n"));
'

PARSE_AND_LIST_ARGS_CASE_Z_AARCH64='
      else if (strcmp (optarg, "force-bti") == 0)
	{
	  plt_type |= PLT_BTI;
	  bti_type = BTI_WARN;
	}
      else if (strcmp (optarg, "pac-plt") == 0)
	plt_type |= PLT_PAC;
'
PARSE_AND_LIST_ARGS_CASE_Z="$PARSE_AND_LIST_ARGS_CASE_Z $PARSE_AND_LIST_ARGS_CASE_Z_AARCH64"

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_FIX_ERRATUM_843419:
      fix_erratum_843419 = ERRAT_ADR | ERRAT_ADRP;
      if (optarg && *optarg)
	{
	  if (strcmp ("full", optarg) == 0)
	    fix_erratum_843419 = ERRAT_ADR | ERRAT_ADRP;
	  else if (strcmp ("adrp", optarg) == 0)
	    fix_erratum_843419 = ERRAT_ADRP;
	  else if (strcmp ("adr", optarg) == 0)
	    fix_erratum_843419 = ERRAT_ADR;
	  else
	    einfo (_("%P: error: unrecognized option for "
		     "--fix-cortex-a53-843419: %s\n"), optarg);
	}
      break;

    case OPTION_NO_APPLY_DYNAMIC_RELOCS:
      no_apply_dynamic_relocs = 1;
      break;

    case OPTION_STUBGROUP_SIZE:
      {
	const char *end;

	group_size = bfd_scan_vma (optarg, &end, 0);
	if (*end)
	  einfo (_("%F%P: 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${EMULATION_NAME}_finish
Commit	Line	Data
a06ea964	1	# This shell script emits a C file. -- C --
82704155	2	# Copyright (C) 2009-2019 Free Software Foundation, Inc.
a06ea964 NC	3	# Contributed by ARM Ltd.
	4	#
	5	# This file is part of the GNU Binutils.
	6	#
	7	# This program is free software; you can redistribute it and/or modify
	8	# it under the terms of the GNU General Public License as published by
	9	# the Free Software Foundation; either version 3 of the license, or
	10	# (at your option) any later version.
	11	#
	12	# This program is distributed in the hope that it will be useful,
	13	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	# GNU General Public License for more details.
	16	#
	17	# You should have received a copy of the GNU General Public License
	18	# along with this program; see the file COPYING3. If not,
	19	# see <http://www.gnu.org/licenses/>.
	20	#
	21
075a2b89	22	# This file is sourced from elf.em, and defines extra aarch64-elf
a06ea964 NC	23	# specific routines.
	24	#
	25	fragment <<EOF
	26
	27	#include "ldctor.h"
	28	#include "elf/aarch64.h"
	29
	30	static int no_enum_size_warning = 0;
	31	static int no_wchar_size_warning = 0;
	32	static int pic_veneer = 0;
68fcca92	33	static int fix_erratum_835769 = 0;
739b5c9c	34	static erratum_84319_opts fix_erratum_843419 = ERRAT_NONE;
1f56df9d	35	static int no_apply_dynamic_relocs = 0;
37c18eed SD	36	static aarch64_plt_type plt_type = PLT_NORMAL;
37c18eed SD	37	static aarch64_enable_bti_type bti_type = BTI_NONE;
a06ea964 NC	38
	39	static void
	40	gld${EMULATION_NAME}_before_parse (void)
	41	{
	42	#ifndef TARGET_ /* I.e., if not generic. */
	43	ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
	44	#endif /* not TARGET_ */
	45	input_flags.dynamic = ${DYNAMIC_LINK-TRUE};
	46	config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`;
e2caaa1f	47	config.separate_code = `if test "x${SEPARATE_CODE}" = xyes ; then echo TRUE ; else echo FALSE ; fi`;
5c3261b0	48	link_info.check_relocs_after_open_input = TRUE;
576438f0	49	link_info.relro = DEFAULT_LD_Z_RELRO;
a06ea964 NC	50	}
	51
	52	static void
	53	aarch64_elf_before_allocation (void)
	54	{
	55	/* We should be able to set the size of the interworking stub section. We
	56	can't do it until later if we have dynamic sections, though. */
	57	if (! elf_hash_table (&link_info)->dynamic_sections_created)
	58	{
	59	/* Here we rummage through the found bfds to collect information. */
	60	LANG_FOR_EACH_INPUT_STATEMENT (is)
6c19b93b AM	61	{
	62	/* Initialise mapping tables for code/data. */
	63	bfd_elf${ELFSIZE}_aarch64_init_maps (is->the_bfd);
	64	}
a06ea964 NC	65	}
	66
	67	/* Call the standard elf routine. */
	68	gld${EMULATION_NAME}_before_allocation ();
	69	}
	70
	71	/* Fake input file for stubs. */
	72	static lang_input_statement_type *stub_file;
	73
	74	/* Whether we need to call gldarm_layout_sections_again. */
	75	static int need_laying_out = 0;
	76
	77	/* Maximum size of a group of input sections that can be handled by
	78	one stub section. A value of +/-1 indicates the bfd back-end
	79	should use a suitable default size. */
	80	static bfd_signed_vma group_size = 1;
	81
	82	struct hook_stub_info
	83	{
	84	lang_statement_list_type add;
	85	asection *input_section;
	86	};
	87
	88	/* Traverse the linker tree to find the spot where the stub goes. */
	89
	90	static bfd_boolean
	91	hook_in_stub (struct hook_stub_info info, lang_statement_union_type *lp)
	92	{
	93	lang_statement_union_type *l;
	94	bfd_boolean ret;
	95
	96	for (; (l = *lp) != NULL; lp = &l->header.next)
	97	{
	98	switch (l->header.type)
	99	{
	100	case lang_constructors_statement_enum:
	101	ret = hook_in_stub (info, &constructor_list.head);
	102	if (ret)
	103	return ret;
	104	break;
	105
	106	case lang_output_section_statement_enum:
	107	ret = hook_in_stub (info,
	108	&l->output_section_statement.children.head);
	109	if (ret)
	110	return ret;
	111	break;
	112
	113	case lang_wild_statement_enum:
	114	ret = hook_in_stub (info, &l->wild_statement.children.head);
	115	if (ret)
	116	return ret;
	117	break;
	118
	119	case lang_group_statement_enum:
	120	ret = hook_in_stub (info, &l->group_statement.children.head);
	121	if (ret)
	122	return ret;
	123	break;
	124
	125	case lang_input_section_enum:
	126	if (l->input_section.section == info->input_section)
	127	{
	128	/* We've found our section. Insert the stub immediately
129	after its associated input section. */
130	*(info->add.tail) = l->header.next;
131	l->header.next = info->add.head;
132	return TRUE;
133	}
134	break;
135
136	case lang_data_statement_enum:
137	case lang_reloc_statement_enum:
138	case lang_object_symbols_statement_enum:
139	case lang_output_statement_enum:
140	case lang_target_statement_enum:
141	case lang_input_statement_enum:
142	case lang_assignment_statement_enum:
143	case lang_padding_statement_enum:
144	case lang_address_statement_enum:
145	case lang_fill_statement_enum:
146	break;
147
148	default:
149	FAIL ();
150	break;
151	}
152	}
153	return FALSE;
154	}
155
156
4390599b	157	/* Call-back for elf${ELFSIZE}_aarch64_size_stubs. */
a06ea964 NC	158
	159	/* Create a new stub section, and arrange for it to be linked
	160	immediately after INPUT_SECTION. */
	161
	162	static asection *
4390599b	163	elf${ELFSIZE}_aarch64_add_stub_section (const char *stub_sec_name,
499c37b5	164	asection *input_section)
a06ea964 NC	165	{
	166	asection *stub_sec;
	167	flagword flags;
	168	asection *output_section;
a06ea964 NC	169	lang_output_section_statement_type *os;
	170	struct hook_stub_info info;
	171
125f83f6	172	flags = (SEC_ALLOC \| SEC_LOAD \| SEC_READONLY \| SEC_CODE \| SEC_LINKER_CREATED
a06ea964 NC	173	\| SEC_HAS_CONTENTS \| SEC_RELOC \| SEC_IN_MEMORY \| SEC_KEEP);
	174	stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
	175	stub_sec_name, flags);
	176	if (stub_sec == NULL)
	177	goto err_ret;
	178
9a2ebffd JW	179	/* Long branch stubs contain a 64-bit address, so the section requires
9a2ebffd JW	180	8 byte alignment. */
fd361982	181	bfd_set_section_alignment (stub_sec, 3);
a06ea964 NC	182
a06ea964 NC	183	output_section = input_section->output_section;
24ef1aa7	184	os = lang_output_section_get (output_section);
a06ea964 NC	185
	186	info.input_section = input_section;
	187	lang_list_init (&info.add);
	188	lang_add_section (&info.add, stub_sec, NULL, os);
	189
	190	if (info.add.head == NULL)
	191	goto err_ret;
	192
	193	if (hook_in_stub (&info, &os->children.head))
	194	return stub_sec;
	195
	196	err_ret:
d003af55	197	einfo (_("%X%P: can not make stub section: %E\n"));
a06ea964 NC	198	return NULL;
	199	}
	200
4390599b	201	/* Another call-back for elf${ELFSIZE}_aarch64_size_stubs. */
a06ea964 NC	202
	203	static void
	204	gldaarch64_layout_sections_again (void)
	205	{
	206	/* If we have changed sizes of the stub sections, then we need
	207	to recalculate all the section offsets. This may mean we need to
	208	add even more stubs. */
d871d478	209	ldelf_map_segments (TRUE);
a06ea964 NC	210	need_laying_out = -1;
	211	}
	212
	213	static void
	214	build_section_lists (lang_statement_union_type *statement)
	215	{
	216	if (statement->header.type == lang_input_section_enum)
	217	{
	218	asection *i = statement->input_section.section;
	219
00f93c44	220	if (!bfd_input_just_syms (i->owner)
a06ea964 NC	221	&& (i->flags & SEC_EXCLUDE) == 0
	222	&& i->output_section != NULL
	223	&& i->output_section->owner == link_info.output_bfd)
4390599b	224	elf${ELFSIZE}_aarch64_next_input_section (& link_info, i);
a06ea964 NC	225	}
	226	}
	227
	228	static void
	229	gld${EMULATION_NAME}_after_allocation (void)
	230	{
75938853 AM	231	int ret;
75938853 AM	232
a06ea964 NC	233	/* bfd_elf32_discard_info just plays with debugging sections,
	234	ie. doesn't affect any code, so we can delay resizing the
	235	sections. It's likely we'll resize everything in the process of
	236	adding stubs. */
75938853 AM	237	ret = bfd_elf_discard_info (link_info.output_bfd, & link_info);
	238	if (ret < 0)
	239	{
d003af55	240	einfo (_("%X%P: .eh_frame/.stab edit: %E\n"));
75938853 AM	241	return;
	242	}
	243	else if (ret > 0)
a06ea964 NC	244	need_laying_out = 1;
	245
	246	/* If generating a relocatable output file, then we don't
	247	have to examine the relocs. */
0e1862bb	248	if (stub_file != NULL && !bfd_link_relocatable (&link_info))
a06ea964	249	{
75938853 AM	250	ret = elf${ELFSIZE}_aarch64_setup_section_lists (link_info.output_bfd,
75938853 AM	251	&link_info);
a06ea964 NC	252	if (ret != 0)
	253	{
	254	if (ret < 0)
	255	{
d003af55 AM	256	einfo (_("%X%P: could not compute sections lists "
d003af55 AM	257	"for stub generation: %E\n"));
a06ea964 NC	258	return;
	259	}
	260
	261	lang_for_each_statement (build_section_lists);
	262
	263	/* Call into the BFD backend to do the real work. */
4390599b	264	if (! elf${ELFSIZE}_aarch64_size_stubs (link_info.output_bfd,
a06ea964 NC	265	stub_file->the_bfd,
	266	& link_info,
	267	group_size,
4390599b	268	& elf${ELFSIZE}_aarch64_add_stub_section,
a06ea964 NC	269	& gldaarch64_layout_sections_again))
a06ea964 NC	270	{
df5f2391	271	einfo (_("%X%P: can not size stub section: %E\n"));
a06ea964 NC	272	return;
	273	}
	274	}
	275	}
	276
	277	if (need_laying_out != -1)
d871d478	278	ldelf_map_segments (need_laying_out);
a06ea964 NC	279	}
	280
	281	static void
	282	gld${EMULATION_NAME}_finish (void)
	283	{
0e1862bb	284	if (!bfd_link_relocatable (&link_info))
a06ea964 NC	285	{
	286	/* Now build the linker stubs. */
	287	if (stub_file->the_bfd->sections != NULL)
	288	{
4390599b	289	if (! elf${ELFSIZE}_aarch64_build_stubs (& link_info))
d003af55	290	einfo (_("%X%P: can not build stubs: %E\n"));
a06ea964 NC	291	}
	292	}
	293
	294	finish_default ();
	295	}
	296
	297	/* This is a convenient point to tell BFD about target specific flags.
	298	After the output has been created, but before inputs are read. */
	299	static void
	300	aarch64_elf_create_output_section_statements (void)
	301	{
	302	if (strstr (bfd_get_target (link_info.output_bfd), "aarch64") == NULL)
	303	{
	304	/* The arm backend needs special fields in the output hash structure.
	305	These will only be created if the output format is an arm format,
	306	hence we do not support linking and changing output formats at the
	307	same time. Use a link followed by objcopy to change output formats. */
df5f2391 AM	308	einfo (_("%F%P: error: cannot change output format "
df5f2391 AM	309	"whilst linking %s binaries\n"), "AArch64");
a06ea964 NC	310	return;
	311	}
	312
37c18eed SD	313	aarch64_bti_pac_info bp_info;
	314	bp_info.plt_type = plt_type;
	315	bp_info.bti_type = bti_type;
	316
4390599b	317	bfd_elf${ELFSIZE}_aarch64_set_options (link_info.output_bfd, &link_info,
a06ea964 NC	318	no_enum_size_warning,
a06ea964 NC	319	no_wchar_size_warning,
4106101c	320	pic_veneer,
1f56df9d	321	fix_erratum_835769, fix_erratum_843419,
37c18eed SD	322	no_apply_dynamic_relocs,
37c18eed SD	323	bp_info);
a06ea964 NC	324
	325	stub_file = lang_add_input_file ("linker stubs",
	326	lang_input_file_is_fake_enum,
	327	NULL);
	328	stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
	329	if (stub_file->the_bfd == NULL
	330	\|\| ! bfd_set_arch_mach (stub_file->the_bfd,
	331	bfd_get_arch (link_info.output_bfd),
	332	bfd_get_mach (link_info.output_bfd)))
	333	{
df5f2391	334	einfo (_("%F%P: can not create BFD: %E\n"));
a06ea964 NC	335	return;
	336	}
	337
	338	stub_file->the_bfd->flags \|= BFD_LINKER_CREATED;
	339	ldlang_add_file (stub_file);
	340	}
	341
a06ea964 NC	342	EOF
	343
	344	# Define some shell vars to insert bits of code into the standard elf
	345	# parse_args and list_options functions.
	346	#
	347	PARSE_AND_LIST_PROLOGUE='
	348	#define OPTION_NO_ENUM_SIZE_WARNING 309
	349	#define OPTION_PIC_VENEER 310
6c19b93b	350	#define OPTION_STUBGROUP_SIZE 311
a06ea964	351	#define OPTION_NO_WCHAR_SIZE_WARNING 312
68fcca92	352	#define OPTION_FIX_ERRATUM_835769 313
4106101c	353	#define OPTION_FIX_ERRATUM_843419 314
1f56df9d	354	#define OPTION_NO_APPLY_DYNAMIC_RELOCS 315
a06ea964 NC	355	'
	356
	357	PARSE_AND_LIST_SHORTOPTS=p
	358
	359	PARSE_AND_LIST_LONGOPTS='
	360	{ "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
	361	{ "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING},
	362	{ "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER},
	363	{ "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
	364	{ "no-wchar-size-warning", no_argument, NULL, OPTION_NO_WCHAR_SIZE_WARNING},
68fcca92	365	{ "fix-cortex-a53-835769", no_argument, NULL, OPTION_FIX_ERRATUM_835769},
739b5c9c	366	{ "fix-cortex-a53-843419", optional_argument, NULL, OPTION_FIX_ERRATUM_843419},
1f56df9d	367	{ "no-apply-dynamic-relocs", no_argument, NULL, OPTION_NO_APPLY_DYNAMIC_RELOCS},
a06ea964 NC	368	'
	369
	370	PARSE_AND_LIST_OPTIONS='
	371	fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible\n"
	372	" enum sizes\n"));
eca4b721	373	fprintf (file, _(" --no-wchar-size-warning Don'\''t warn about objects with incompatible\n"
a06ea964 NC	374	" wchar_t sizes\n"));
	375	fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n"));
	376	fprintf (file, _("\
df5f2391 AM	377	--stub-group-size=N Maximum size of a group of input sections that\n\
	378	can be handled by one stub section. A negative\n\
	379	value locates all stubs after their branches\n\
	380	(with a group size of -N), while a positive\n\
	381	value allows two groups of input sections, one\n\
	382	before, and one after each stub section.\n\
	383	Values of +/-1 indicate the linker should\n\
	384	choose suitable defaults.\n"));
68fcca92	385	fprintf (file, _(" --fix-cortex-a53-835769 Fix erratum 835769\n"));
739b5c9c TC	386	fprintf (file, _("\
	387	--fix-cortex-a53-843419[=full\|adr\|adrp] Fix erratum 843419 and optionally specify which workaround to use.\n\
	388	full (default): Use both ADRP and ADR workaround, this will \n\
	389	increase the size of your binaries.\n\
	390	adr: Only use the ADR workaround, this will not cause any increase\n\
	391	in binary size but linking will fail if the referenced address is\n\
	392	out of range of an ADR instruction. This will remove the need of using\n\
	393	a veneer and results in both performance and size benefits.\n\
	394	adrp: Use only the ADRP workaround, this will never rewrite your ADRP\n\
	395	instruction into an ADR. As such the workaround will always use a\n\
	396	veneer and this will give you both a performance and size overhead.\n"));
df5f2391	397	fprintf (file, _(" --no-apply-dynamic-relocs Do not apply link-time values for dynamic relocations\n"));
8bf6d176 SD	398	fprintf (file, _(" -z force-bti Turn on Branch Target Identification mechanism and generate PLTs with BTI. Generate warnings for missing BTI on inputs\n"));
8bf6d176 SD	399	fprintf (file, _(" -z pac-plt Protect PLTs with Pointer Authentication.\n"));
a06ea964 NC	400	'
a06ea964 NC	401
8bf6d176 SD	402	PARSE_AND_LIST_ARGS_CASE_Z_AARCH64='
	403	else if (strcmp (optarg, "force-bti") == 0)
	404	{
	405	plt_type \|= PLT_BTI;
	406	bti_type = BTI_WARN;
	407	}
	408	else if (strcmp (optarg, "pac-plt") == 0)
	409	plt_type \|= PLT_PAC;
	410	'
	411	PARSE_AND_LIST_ARGS_CASE_Z="$PARSE_AND_LIST_ARGS_CASE_Z $PARSE_AND_LIST_ARGS_CASE_Z_AARCH64"
	412
a06ea964 NC	413	PARSE_AND_LIST_ARGS_CASES='
	414	case '\'p\'':
	415	/* Only here for backwards compatibility. */
	416	break;
	417
	418	case OPTION_NO_ENUM_SIZE_WARNING:
	419	no_enum_size_warning = 1;
	420	break;
	421
	422	case OPTION_NO_WCHAR_SIZE_WARNING:
	423	no_wchar_size_warning = 1;
	424	break;
	425
	426	case OPTION_PIC_VENEER:
	427	pic_veneer = 1;
	428	break;
	429
68fcca92 JW	430	case OPTION_FIX_ERRATUM_835769:
	431	fix_erratum_835769 = 1;
	432	break;
	433
4106101c	434	case OPTION_FIX_ERRATUM_843419:
739b5c9c TC	435	fix_erratum_843419 = ERRAT_ADR \| ERRAT_ADRP;
	436	if (optarg && *optarg)
	437	{
	438	if (strcmp ("full", optarg) == 0)
	439	fix_erratum_843419 = ERRAT_ADR \| ERRAT_ADRP;
	440	else if (strcmp ("adrp", optarg) == 0)
	441	fix_erratum_843419 = ERRAT_ADRP;
	442	else if (strcmp ("adr", optarg) == 0)
	443	fix_erratum_843419 = ERRAT_ADR;
	444	else
	445	einfo (_("%P: error: unrecognized option for "
	446	"--fix-cortex-a53-843419: %s\n"), optarg);
	447	}
4106101c MS	448	break;
4106101c MS	449
1f56df9d JW	450	case OPTION_NO_APPLY_DYNAMIC_RELOCS:
	451	no_apply_dynamic_relocs = 1;
	452	break;
	453
a06ea964 NC	454	case OPTION_STUBGROUP_SIZE:
	455	{
	456	const char *end;
	457
6c19b93b AM	458	group_size = bfd_scan_vma (optarg, &end, 0);
6c19b93b AM	459	if (*end)
df5f2391	460	einfo (_("%F%P: invalid number `%s'\''\n"), optarg);
a06ea964 NC	461	}
	462	break;
	463	'
	464
	465	# We have our own before_allocation etc. functions, but they call
	466	# the standard routines, so give them a different name.
	467	LDEMUL_BEFORE_ALLOCATION=aarch64_elf_before_allocation
	468	LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
	469	LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=aarch64_elf_create_output_section_statements
	470
	471	# Replace the elf before_parse function with our own.
	472	LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
	473
	474	# Call the extra arm-elf function
	475	LDEMUL_FINISH=gld${EMULATION_NAME}_finish