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

# This shell script emits a C file. -*- C -*-
#   Copyright (C) 2009-2020 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"
#include "elfxx-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_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${EMULATION_NAME}_finish
Commit	Line	Data
a06ea964	1	# This shell script emits a C file. -- C --
b3adc24a	2	# Copyright (C) 2009-2020 Free Software Foundation, Inc.
a06ea964 NC	3	# Contributed by ARM Ltd.
	4	#
	5	# This file is part of the GNU Binutils.
	6	#
	7	# This program is free software; you can redistribute it and/or modify
	8	# it under the terms of the GNU General Public License as published by
	9	# the Free Software Foundation; either version 3 of the license, or
	10	# (at your option) any later version.
	11	#
	12	# This program is distributed in the hope that it will be useful,
	13	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	# GNU General Public License for more details.
	16	#
	17	# You should have received a copy of the GNU General Public License
	18	# along with this program; see the file COPYING3. If not,
	19	# see <http://www.gnu.org/licenses/>.
	20	#
	21
075a2b89	22	# This file is sourced from elf.em, and defines extra aarch64-elf
a06ea964 NC	23	# specific routines.
	24	#
	25	fragment <<EOF
	26
	27	#include "ldctor.h"
	28	#include "elf/aarch64.h"
a8bfaadb	29	#include "elfxx-aarch64.h"
a06ea964 NC	30
	31	static int no_enum_size_warning = 0;
	32	static int no_wchar_size_warning = 0;
	33	static int pic_veneer = 0;
68fcca92	34	static int fix_erratum_835769 = 0;
739b5c9c	35	static erratum_84319_opts fix_erratum_843419 = ERRAT_NONE;
1f56df9d	36	static int no_apply_dynamic_relocs = 0;
37c18eed SD	37	static aarch64_plt_type plt_type = PLT_NORMAL;
37c18eed SD	38	static aarch64_enable_bti_type bti_type = BTI_NONE;
a06ea964 NC	39
	40	static void
	41	gld${EMULATION_NAME}_before_parse (void)
	42	{
	43	#ifndef TARGET_ /* I.e., if not generic. */
	44	ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
	45	#endif /* not TARGET_ */
	46	input_flags.dynamic = ${DYNAMIC_LINK-TRUE};
	47	config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`;
e2caaa1f	48	config.separate_code = `if test "x${SEPARATE_CODE}" = xyes ; then echo TRUE ; else echo FALSE ; fi`;
5c3261b0	49	link_info.check_relocs_after_open_input = TRUE;
576438f0	50	link_info.relro = DEFAULT_LD_Z_RELRO;
a06ea964 NC	51	}
	52
	53	static void
	54	aarch64_elf_before_allocation (void)
	55	{
	56	/* We should be able to set the size of the interworking stub section. We
	57	can't do it until later if we have dynamic sections, though. */
	58	if (! elf_hash_table (&link_info)->dynamic_sections_created)
	59	{
	60	/* Here we rummage through the found bfds to collect information. */
	61	LANG_FOR_EACH_INPUT_STATEMENT (is)
6c19b93b AM	62	{
	63	/* Initialise mapping tables for code/data. */
	64	bfd_elf${ELFSIZE}_aarch64_init_maps (is->the_bfd);
	65	}
a06ea964 NC	66	}
	67
	68	/* Call the standard elf routine. */
	69	gld${EMULATION_NAME}_before_allocation ();
	70	}
	71
	72	/* Fake input file for stubs. */
	73	static lang_input_statement_type *stub_file;
	74
	75	/* Whether we need to call gldarm_layout_sections_again. */
	76	static int need_laying_out = 0;
	77
	78	/* Maximum size of a group of input sections that can be handled by
	79	one stub section. A value of +/-1 indicates the bfd back-end
	80	should use a suitable default size. */
	81	static bfd_signed_vma group_size = 1;
	82
	83	struct hook_stub_info
	84	{
	85	lang_statement_list_type add;
	86	asection *input_section;
	87	};
	88
	89	/* Traverse the linker tree to find the spot where the stub goes. */
	90
	91	static bfd_boolean
	92	hook_in_stub (struct hook_stub_info info, lang_statement_union_type *lp)
	93	{
	94	lang_statement_union_type *l;
	95	bfd_boolean ret;
	96
	97	for (; (l = *lp) != NULL; lp = &l->header.next)
	98	{
	99	switch (l->header.type)
	100	{
	101	case lang_constructors_statement_enum:
	102	ret = hook_in_stub (info, &constructor_list.head);
	103	if (ret)
	104	return ret;
	105	break;
	106
	107	case lang_output_section_statement_enum:
	108	ret = hook_in_stub (info,
	109	&l->output_section_statement.children.head);
	110	if (ret)
	111	return ret;
	112	break;
	113
	114	case lang_wild_statement_enum:
	115	ret = hook_in_stub (info, &l->wild_statement.children.head);
	116	if (ret)
	117	return ret;
	118	break;
	119
	120	case lang_group_statement_enum:
	121	ret = hook_in_stub (info, &l->group_statement.children.head);
	122	if (ret)
	123	return ret;
	124	break;
	125
	126	case lang_input_section_enum:
	127	if (l->input_section.section == info->input_section)
	128	{
	129	/* We've found our section. Insert the stub immediately
130	after its associated input section. */
131	*(info->add.tail) = l->header.next;
132	l->header.next = info->add.head;
133	return TRUE;
134	}
135	break;
136
137	case lang_data_statement_enum:
138	case lang_reloc_statement_enum:
139	case lang_object_symbols_statement_enum:
140	case lang_output_statement_enum:
141	case lang_target_statement_enum:
142	case lang_input_statement_enum:
143	case lang_assignment_statement_enum:
144	case lang_padding_statement_enum:
145	case lang_address_statement_enum:
146	case lang_fill_statement_enum:
147	break;
148
149	default:
150	FAIL ();
151	break;
152	}
153	}
154	return FALSE;
155	}
156
157
4390599b	158	/* Call-back for elf${ELFSIZE}_aarch64_size_stubs. */
a06ea964 NC	159
	160	/* Create a new stub section, and arrange for it to be linked
	161	immediately after INPUT_SECTION. */
	162
	163	static asection *
4390599b	164	elf${ELFSIZE}_aarch64_add_stub_section (const char *stub_sec_name,
499c37b5	165	asection *input_section)
a06ea964 NC	166	{
	167	asection *stub_sec;
	168	flagword flags;
	169	asection *output_section;
a06ea964 NC	170	lang_output_section_statement_type *os;
	171	struct hook_stub_info info;
	172
0db131fb	173	flags = (SEC_ALLOC \| SEC_LOAD \| SEC_READONLY \| SEC_CODE
a06ea964 NC	174	\| SEC_HAS_CONTENTS \| SEC_RELOC \| SEC_IN_MEMORY \| SEC_KEEP);
	175	stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
	176	stub_sec_name, flags);
	177	if (stub_sec == NULL)
	178	goto err_ret;
	179
9a2ebffd JW	180	/* Long branch stubs contain a 64-bit address, so the section requires
9a2ebffd JW	181	8 byte alignment. */
fd361982	182	bfd_set_section_alignment (stub_sec, 3);
a06ea964 NC	183
a06ea964 NC	184	output_section = input_section->output_section;
24ef1aa7	185	os = lang_output_section_get (output_section);
a06ea964 NC	186
	187	info.input_section = input_section;
	188	lang_list_init (&info.add);
	189	lang_add_section (&info.add, stub_sec, NULL, os);
	190
	191	if (info.add.head == NULL)
	192	goto err_ret;
	193
	194	if (hook_in_stub (&info, &os->children.head))
	195	return stub_sec;
	196
	197	err_ret:
d003af55	198	einfo (_("%X%P: can not make stub section: %E\n"));
a06ea964 NC	199	return NULL;
	200	}
	201
4390599b	202	/* Another call-back for elf${ELFSIZE}_aarch64_size_stubs. */
a06ea964 NC	203
	204	static void
	205	gldaarch64_layout_sections_again (void)
	206	{
	207	/* If we have changed sizes of the stub sections, then we need
	208	to recalculate all the section offsets. This may mean we need to
	209	add even more stubs. */
d871d478	210	ldelf_map_segments (TRUE);
a06ea964 NC	211	need_laying_out = -1;
	212	}
	213
	214	static void
	215	build_section_lists (lang_statement_union_type *statement)
	216	{
	217	if (statement->header.type == lang_input_section_enum)
	218	{
	219	asection *i = statement->input_section.section;
	220
00f93c44	221	if (!bfd_input_just_syms (i->owner)
a06ea964 NC	222	&& (i->flags & SEC_EXCLUDE) == 0
	223	&& i->output_section != NULL
	224	&& i->output_section->owner == link_info.output_bfd)
4390599b	225	elf${ELFSIZE}_aarch64_next_input_section (& link_info, i);
a06ea964 NC	226	}
	227	}
	228
	229	static void
	230	gld${EMULATION_NAME}_after_allocation (void)
	231	{
75938853 AM	232	int ret;
75938853 AM	233
a06ea964 NC	234	/* bfd_elf32_discard_info just plays with debugging sections,
	235	ie. doesn't affect any code, so we can delay resizing the
	236	sections. It's likely we'll resize everything in the process of
	237	adding stubs. */
75938853 AM	238	ret = bfd_elf_discard_info (link_info.output_bfd, & link_info);
	239	if (ret < 0)
	240	{
d003af55	241	einfo (_("%X%P: .eh_frame/.stab edit: %E\n"));
75938853 AM	242	return;
	243	}
	244	else if (ret > 0)
a06ea964 NC	245	need_laying_out = 1;
	246
	247	/* If generating a relocatable output file, then we don't
	248	have to examine the relocs. */
0e1862bb	249	if (stub_file != NULL && !bfd_link_relocatable (&link_info))
a06ea964	250	{
75938853 AM	251	ret = elf${ELFSIZE}_aarch64_setup_section_lists (link_info.output_bfd,
75938853 AM	252	&link_info);
a06ea964 NC	253	if (ret != 0)
	254	{
	255	if (ret < 0)
	256	{
d003af55 AM	257	einfo (_("%X%P: could not compute sections lists "
d003af55 AM	258	"for stub generation: %E\n"));
a06ea964 NC	259	return;
	260	}
	261
	262	lang_for_each_statement (build_section_lists);
	263
	264	/* Call into the BFD backend to do the real work. */
4390599b	265	if (! elf${ELFSIZE}_aarch64_size_stubs (link_info.output_bfd,
a06ea964 NC	266	stub_file->the_bfd,
	267	& link_info,
	268	group_size,
4390599b	269	& elf${ELFSIZE}_aarch64_add_stub_section,
a06ea964 NC	270	& gldaarch64_layout_sections_again))
a06ea964 NC	271	{
df5f2391	272	einfo (_("%X%P: can not size stub section: %E\n"));
a06ea964 NC	273	return;
	274	}
	275	}
	276	}
	277
	278	if (need_laying_out != -1)
d871d478	279	ldelf_map_segments (need_laying_out);
a06ea964 NC	280	}
	281
	282	static void
	283	gld${EMULATION_NAME}_finish (void)
	284	{
0e1862bb	285	if (!bfd_link_relocatable (&link_info))
a06ea964 NC	286	{
	287	/* Now build the linker stubs. */
	288	if (stub_file->the_bfd->sections != NULL)
	289	{
4390599b	290	if (! elf${ELFSIZE}_aarch64_build_stubs (& link_info))
d003af55	291	einfo (_("%X%P: can not build stubs: %E\n"));
a06ea964 NC	292	}
	293	}
	294
	295	finish_default ();
	296	}
	297
	298	/* This is a convenient point to tell BFD about target specific flags.
	299	After the output has been created, but before inputs are read. */
	300	static void
	301	aarch64_elf_create_output_section_statements (void)
	302	{
	303	if (strstr (bfd_get_target (link_info.output_bfd), "aarch64") == NULL)
	304	{
	305	/* The arm backend needs special fields in the output hash structure.
	306	These will only be created if the output format is an arm format,
	307	hence we do not support linking and changing output formats at the
	308	same time. Use a link followed by objcopy to change output formats. */
df5f2391 AM	309	einfo (_("%F%P: error: cannot change output format "
df5f2391 AM	310	"whilst linking %s binaries\n"), "AArch64");
a06ea964 NC	311	return;
	312	}
	313
37c18eed SD	314	aarch64_bti_pac_info bp_info;
	315	bp_info.plt_type = plt_type;
	316	bp_info.bti_type = bti_type;
	317
4390599b	318	bfd_elf${ELFSIZE}_aarch64_set_options (link_info.output_bfd, &link_info,
a06ea964 NC	319	no_enum_size_warning,
a06ea964 NC	320	no_wchar_size_warning,
4106101c	321	pic_veneer,
1f56df9d	322	fix_erratum_835769, fix_erratum_843419,
37c18eed SD	323	no_apply_dynamic_relocs,
37c18eed SD	324	bp_info);
a06ea964 NC	325
	326	stub_file = lang_add_input_file ("linker stubs",
	327	lang_input_file_is_fake_enum,
	328	NULL);
	329	stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
	330	if (stub_file->the_bfd == NULL
	331	\|\| ! bfd_set_arch_mach (stub_file->the_bfd,
	332	bfd_get_arch (link_info.output_bfd),
	333	bfd_get_mach (link_info.output_bfd)))
	334	{
df5f2391	335	einfo (_("%F%P: can not create BFD: %E\n"));
a06ea964 NC	336	return;
	337	}
	338
	339	stub_file->the_bfd->flags \|= BFD_LINKER_CREATED;
	340	ldlang_add_file (stub_file);
	341	}
	342
a06ea964 NC	343	EOF
	344
	345	# Define some shell vars to insert bits of code into the standard elf
	346	# parse_args and list_options functions.
	347	#
	348	PARSE_AND_LIST_PROLOGUE='
	349	#define OPTION_NO_ENUM_SIZE_WARNING 309
	350	#define OPTION_PIC_VENEER 310
6c19b93b	351	#define OPTION_STUBGROUP_SIZE 311
a06ea964	352	#define OPTION_NO_WCHAR_SIZE_WARNING 312
68fcca92	353	#define OPTION_FIX_ERRATUM_835769 313
4106101c	354	#define OPTION_FIX_ERRATUM_843419 314
1f56df9d	355	#define OPTION_NO_APPLY_DYNAMIC_RELOCS 315
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},
739b5c9c	367	{ "fix-cortex-a53-843419", optional_argument, NULL, OPTION_FIX_ERRATUM_843419},
1f56df9d	368	{ "no-apply-dynamic-relocs", no_argument, NULL, OPTION_NO_APPLY_DYNAMIC_RELOCS},
a06ea964 NC	369	'
	370
	371	PARSE_AND_LIST_OPTIONS='
	372	fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible\n"
	373	" enum sizes\n"));
eca4b721	374	fprintf (file, _(" --no-wchar-size-warning Don'\''t warn about objects with incompatible\n"
a06ea964 NC	375	" wchar_t sizes\n"));
	376	fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n"));
	377	fprintf (file, _("\
df5f2391 AM	378	--stub-group-size=N Maximum size of a group of input sections that\n\
	379	can be handled by one stub section. A negative\n\
	380	value locates all stubs after their branches\n\
	381	(with a group size of -N), while a positive\n\
	382	value allows two groups of input sections, one\n\
	383	before, and one after each stub section.\n\
	384	Values of +/-1 indicate the linker should\n\
	385	choose suitable defaults.\n"));
68fcca92	386	fprintf (file, _(" --fix-cortex-a53-835769 Fix erratum 835769\n"));
739b5c9c TC	387	fprintf (file, _("\
	388	--fix-cortex-a53-843419[=full\|adr\|adrp] Fix erratum 843419 and optionally specify which workaround to use.\n\
	389	full (default): Use both ADRP and ADR workaround, this will \n\
	390	increase the size of your binaries.\n\
	391	adr: Only use the ADR workaround, this will not cause any increase\n\
	392	in binary size but linking will fail if the referenced address is\n\
	393	out of range of an ADR instruction. This will remove the need of using\n\
	394	a veneer and results in both performance and size benefits.\n\
	395	adrp: Use only the ADRP workaround, this will never rewrite your ADRP\n\
	396	instruction into an ADR. As such the workaround will always use a\n\
	397	veneer and this will give you both a performance and size overhead.\n"));
df5f2391	398	fprintf (file, _(" --no-apply-dynamic-relocs Do not apply link-time values for dynamic relocations\n"));
8bf6d176 SD	399	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	400	fprintf (file, _(" -z pac-plt Protect PLTs with Pointer Authentication.\n"));
a06ea964 NC	401	'
a06ea964 NC	402
8bf6d176 SD	403	PARSE_AND_LIST_ARGS_CASE_Z_AARCH64='
	404	else if (strcmp (optarg, "force-bti") == 0)
	405	{
	406	plt_type \|= PLT_BTI;
	407	bti_type = BTI_WARN;
	408	}
	409	else if (strcmp (optarg, "pac-plt") == 0)
	410	plt_type \|= PLT_PAC;
	411	'
	412	PARSE_AND_LIST_ARGS_CASE_Z="$PARSE_AND_LIST_ARGS_CASE_Z $PARSE_AND_LIST_ARGS_CASE_Z_AARCH64"
	413
a06ea964 NC	414	PARSE_AND_LIST_ARGS_CASES='
	415	case '\'p\'':
	416	/* Only here for backwards compatibility. */
	417	break;
	418
	419	case OPTION_NO_ENUM_SIZE_WARNING:
	420	no_enum_size_warning = 1;
	421	break;
	422
	423	case OPTION_NO_WCHAR_SIZE_WARNING:
	424	no_wchar_size_warning = 1;
	425	break;
	426
	427	case OPTION_PIC_VENEER:
	428	pic_veneer = 1;
	429	break;
	430
68fcca92 JW	431	case OPTION_FIX_ERRATUM_835769:
	432	fix_erratum_835769 = 1;
	433	break;
	434
4106101c	435	case OPTION_FIX_ERRATUM_843419:
739b5c9c TC	436	fix_erratum_843419 = ERRAT_ADR \| ERRAT_ADRP;
	437	if (optarg && *optarg)
	438	{
	439	if (strcmp ("full", optarg) == 0)
	440	fix_erratum_843419 = ERRAT_ADR \| ERRAT_ADRP;
	441	else if (strcmp ("adrp", optarg) == 0)
	442	fix_erratum_843419 = ERRAT_ADRP;
	443	else if (strcmp ("adr", optarg) == 0)
	444	fix_erratum_843419 = ERRAT_ADR;
	445	else
	446	einfo (_("%P: error: unrecognized option for "
	447	"--fix-cortex-a53-843419: %s\n"), optarg);
	448	}
4106101c MS	449	break;
4106101c MS	450
1f56df9d JW	451	case OPTION_NO_APPLY_DYNAMIC_RELOCS:
	452	no_apply_dynamic_relocs = 1;
	453	break;
	454
a06ea964 NC	455	case OPTION_STUBGROUP_SIZE:
	456	{
	457	const char *end;
	458
6c19b93b AM	459	group_size = bfd_scan_vma (optarg, &end, 0);
6c19b93b AM	460	if (*end)
df5f2391	461	einfo (_("%F%P: invalid number `%s'\''\n"), optarg);
a06ea964 NC	462	}
	463	break;
	464	'
	465
	466	# We have our own before_allocation etc. functions, but they call
	467	# the standard routines, so give them a different name.
	468	LDEMUL_BEFORE_ALLOCATION=aarch64_elf_before_allocation
	469	LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
	470	LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=aarch64_elf_create_output_section_statements
	471
	472	# Replace the elf before_parse function with our own.
	473	LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
	474
	475	# Call the extra arm-elf function
	476	LDEMUL_FINISH=gld${EMULATION_NAME}_finish