[thirdparty/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${SEPARATE_CODE}" = xyes ; then echo TRUE ; else echo FALSE ; fi`;
  link_info.check_relocs_after_open_input = TRUE;
EOF
if test -n "$COMMONPAGESIZE"; then
fragment <<EOF
  link_info.relro = DEFAULT_LD_Z_RELRO;
EOF
fi
fragment <<EOF
}

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${SEPARATE_CODE}" = xyes ; then echo TRUE ; else echo FALSE ; fi`;
5c3261b0	49	link_info.check_relocs_after_open_input = TRUE;
5fd104ad AM	50	EOF
	51	if test -n "$COMMONPAGESIZE"; then
	52	fragment <<EOF
576438f0	53	link_info.relro = DEFAULT_LD_Z_RELRO;
5fd104ad AM	54	EOF
	55	fi
	56	fragment <<EOF
a06ea964 NC	57	}
	58
	59	static void
	60	aarch64_elf_before_allocation (void)
	61	{
	62	/* We should be able to set the size of the interworking stub section. We
	63	can't do it until later if we have dynamic sections, though. */
	64	if (! elf_hash_table (&link_info)->dynamic_sections_created)
	65	{
	66	/* Here we rummage through the found bfds to collect information. */
	67	LANG_FOR_EACH_INPUT_STATEMENT (is)
6c19b93b AM	68	{
	69	/* Initialise mapping tables for code/data. */
	70	bfd_elf${ELFSIZE}_aarch64_init_maps (is->the_bfd);
	71	}
a06ea964 NC	72	}
	73
	74	/* Call the standard elf routine. */
	75	gld${EMULATION_NAME}_before_allocation ();
	76	}
	77
	78	/* Fake input file for stubs. */
	79	static lang_input_statement_type *stub_file;
	80
	81	/* Whether we need to call gldarm_layout_sections_again. */
	82	static int need_laying_out = 0;
	83
	84	/* Maximum size of a group of input sections that can be handled by
	85	one stub section. A value of +/-1 indicates the bfd back-end
	86	should use a suitable default size. */
	87	static bfd_signed_vma group_size = 1;
	88
	89	struct hook_stub_info
	90	{
	91	lang_statement_list_type add;
	92	asection *input_section;
	93	};
	94
	95	/* Traverse the linker tree to find the spot where the stub goes. */
	96
	97	static bfd_boolean
	98	hook_in_stub (struct hook_stub_info info, lang_statement_union_type *lp)
	99	{
	100	lang_statement_union_type *l;
	101	bfd_boolean ret;
	102
	103	for (; (l = *lp) != NULL; lp = &l->header.next)
	104	{
	105	switch (l->header.type)
	106	{
	107	case lang_constructors_statement_enum:
	108	ret = hook_in_stub (info, &constructor_list.head);
	109	if (ret)
	110	return ret;
	111	break;
	112
	113	case lang_output_section_statement_enum:
	114	ret = hook_in_stub (info,
	115	&l->output_section_statement.children.head);
	116	if (ret)
	117	return ret;
	118	break;
	119
	120	case lang_wild_statement_enum:
	121	ret = hook_in_stub (info, &l->wild_statement.children.head);
	122	if (ret)
	123	return ret;
	124	break;
	125
	126	case lang_group_statement_enum:
	127	ret = hook_in_stub (info, &l->group_statement.children.head);
	128	if (ret)
	129	return ret;
	130	break;
	131
	132	case lang_input_section_enum:
	133	if (l->input_section.section == info->input_section)
	134	{
	135	/* We've found our section. Insert the stub immediately
136	after its associated input section. */
137	*(info->add.tail) = l->header.next;
138	l->header.next = info->add.head;
139	return TRUE;
140	}
141	break;
142
143	case lang_data_statement_enum:
144	case lang_reloc_statement_enum:
145	case lang_object_symbols_statement_enum:
146	case lang_output_statement_enum:
147	case lang_target_statement_enum:
148	case lang_input_statement_enum:
149	case lang_assignment_statement_enum:
150	case lang_padding_statement_enum:
151	case lang_address_statement_enum:
152	case lang_fill_statement_enum:
153	break;
154
155	default:
156	FAIL ();
157	break;
158	}
159	}
160	return FALSE;
161	}
162
163
4390599b	164	/* Call-back for elf${ELFSIZE}_aarch64_size_stubs. */
a06ea964 NC	165
	166	/* Create a new stub section, and arrange for it to be linked
	167	immediately after INPUT_SECTION. */
	168
	169	static asection *
4390599b	170	elf${ELFSIZE}_aarch64_add_stub_section (const char *stub_sec_name,
499c37b5	171	asection *input_section)
a06ea964 NC	172	{
	173	asection *stub_sec;
	174	flagword flags;
	175	asection *output_section;
a06ea964 NC	176	lang_output_section_statement_type *os;
	177	struct hook_stub_info info;
	178
0db131fb	179	flags = (SEC_ALLOC \| SEC_LOAD \| SEC_READONLY \| SEC_CODE
a06ea964 NC	180	\| SEC_HAS_CONTENTS \| SEC_RELOC \| SEC_IN_MEMORY \| SEC_KEEP);
	181	stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
	182	stub_sec_name, flags);
	183	if (stub_sec == NULL)
	184	goto err_ret;
	185
9a2ebffd JW	186	/* Long branch stubs contain a 64-bit address, so the section requires
9a2ebffd JW	187	8 byte alignment. */
fd361982	188	bfd_set_section_alignment (stub_sec, 3);
a06ea964 NC	189
a06ea964 NC	190	output_section = input_section->output_section;
24ef1aa7	191	os = lang_output_section_get (output_section);
a06ea964 NC	192
	193	info.input_section = input_section;
	194	lang_list_init (&info.add);
	195	lang_add_section (&info.add, stub_sec, NULL, os);
	196
	197	if (info.add.head == NULL)
	198	goto err_ret;
	199
	200	if (hook_in_stub (&info, &os->children.head))
	201	return stub_sec;
	202
	203	err_ret:
d003af55	204	einfo (_("%X%P: can not make stub section: %E\n"));
a06ea964 NC	205	return NULL;
	206	}
	207
4390599b	208	/* Another call-back for elf${ELFSIZE}_aarch64_size_stubs. */
a06ea964 NC	209
	210	static void
	211	gldaarch64_layout_sections_again (void)
	212	{
	213	/* If we have changed sizes of the stub sections, then we need
	214	to recalculate all the section offsets. This may mean we need to
	215	add even more stubs. */
d871d478	216	ldelf_map_segments (TRUE);
a06ea964 NC	217	need_laying_out = -1;
	218	}
	219
	220	static void
	221	build_section_lists (lang_statement_union_type *statement)
	222	{
	223	if (statement->header.type == lang_input_section_enum)
	224	{
	225	asection *i = statement->input_section.section;
	226
00f93c44	227	if (!bfd_input_just_syms (i->owner)
a06ea964 NC	228	&& (i->flags & SEC_EXCLUDE) == 0
	229	&& i->output_section != NULL
	230	&& i->output_section->owner == link_info.output_bfd)
4390599b	231	elf${ELFSIZE}_aarch64_next_input_section (& link_info, i);
a06ea964 NC	232	}
	233	}
	234
	235	static void
	236	gld${EMULATION_NAME}_after_allocation (void)
	237	{
75938853 AM	238	int ret;
75938853 AM	239
a06ea964 NC	240	/* bfd_elf32_discard_info just plays with debugging sections,
	241	ie. doesn't affect any code, so we can delay resizing the
	242	sections. It's likely we'll resize everything in the process of
	243	adding stubs. */
75938853 AM	244	ret = bfd_elf_discard_info (link_info.output_bfd, & link_info);
	245	if (ret < 0)
	246	{
d003af55	247	einfo (_("%X%P: .eh_frame/.stab edit: %E\n"));
75938853 AM	248	return;
	249	}
	250	else if (ret > 0)
a06ea964 NC	251	need_laying_out = 1;
	252
	253	/* If generating a relocatable output file, then we don't
	254	have to examine the relocs. */
0e1862bb	255	if (stub_file != NULL && !bfd_link_relocatable (&link_info))
a06ea964	256	{
75938853 AM	257	ret = elf${ELFSIZE}_aarch64_setup_section_lists (link_info.output_bfd,
75938853 AM	258	&link_info);
a06ea964 NC	259	if (ret != 0)
	260	{
	261	if (ret < 0)
	262	{
d003af55 AM	263	einfo (_("%X%P: could not compute sections lists "
d003af55 AM	264	"for stub generation: %E\n"));
a06ea964 NC	265	return;
	266	}
	267
	268	lang_for_each_statement (build_section_lists);
	269
	270	/* Call into the BFD backend to do the real work. */
4390599b	271	if (! elf${ELFSIZE}_aarch64_size_stubs (link_info.output_bfd,
a06ea964 NC	272	stub_file->the_bfd,
	273	& link_info,
	274	group_size,
4390599b	275	& elf${ELFSIZE}_aarch64_add_stub_section,
a06ea964 NC	276	& gldaarch64_layout_sections_again))
a06ea964 NC	277	{
df5f2391	278	einfo (_("%X%P: can not size stub section: %E\n"));
a06ea964 NC	279	return;
	280	}
	281	}
	282	}
	283
	284	if (need_laying_out != -1)
d871d478	285	ldelf_map_segments (need_laying_out);
a06ea964 NC	286	}
	287
	288	static void
	289	gld${EMULATION_NAME}_finish (void)
	290	{
0e1862bb	291	if (!bfd_link_relocatable (&link_info))
a06ea964 NC	292	{
	293	/* Now build the linker stubs. */
	294	if (stub_file->the_bfd->sections != NULL)
	295	{
4390599b	296	if (! elf${ELFSIZE}_aarch64_build_stubs (& link_info))
d003af55	297	einfo (_("%X%P: can not build stubs: %E\n"));
a06ea964 NC	298	}
	299	}
	300
	301	finish_default ();
	302	}
	303
	304	/* This is a convenient point to tell BFD about target specific flags.
	305	After the output has been created, but before inputs are read. */
	306	static void
	307	aarch64_elf_create_output_section_statements (void)
	308	{
	309	if (strstr (bfd_get_target (link_info.output_bfd), "aarch64") == NULL)
	310	{
	311	/* The arm backend needs special fields in the output hash structure.
	312	These will only be created if the output format is an arm format,
	313	hence we do not support linking and changing output formats at the
	314	same time. Use a link followed by objcopy to change output formats. */
df5f2391 AM	315	einfo (_("%F%P: error: cannot change output format "
df5f2391 AM	316	"whilst linking %s binaries\n"), "AArch64");
a06ea964 NC	317	return;
	318	}
	319
37c18eed SD	320	aarch64_bti_pac_info bp_info;
	321	bp_info.plt_type = plt_type;
	322	bp_info.bti_type = bti_type;
	323
4390599b	324	bfd_elf${ELFSIZE}_aarch64_set_options (link_info.output_bfd, &link_info,
a06ea964 NC	325	no_enum_size_warning,
a06ea964 NC	326	no_wchar_size_warning,
4106101c	327	pic_veneer,
1f56df9d	328	fix_erratum_835769, fix_erratum_843419,
37c18eed SD	329	no_apply_dynamic_relocs,
37c18eed SD	330	bp_info);
a06ea964 NC	331
	332	stub_file = lang_add_input_file ("linker stubs",
	333	lang_input_file_is_fake_enum,
	334	NULL);
	335	stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
	336	if (stub_file->the_bfd == NULL
	337	\|\| ! bfd_set_arch_mach (stub_file->the_bfd,
	338	bfd_get_arch (link_info.output_bfd),
	339	bfd_get_mach (link_info.output_bfd)))
	340	{
df5f2391	341	einfo (_("%F%P: can not create BFD: %E\n"));
a06ea964 NC	342	return;
	343	}
	344
	345	stub_file->the_bfd->flags \|= BFD_LINKER_CREATED;
	346	ldlang_add_file (stub_file);
	347	}
	348
a06ea964 NC	349	EOF
	350
	351	# Define some shell vars to insert bits of code into the standard elf
	352	# parse_args and list_options functions.
	353	#
	354	PARSE_AND_LIST_PROLOGUE='
	355	#define OPTION_NO_ENUM_SIZE_WARNING 309
	356	#define OPTION_PIC_VENEER 310
6c19b93b	357	#define OPTION_STUBGROUP_SIZE 311
a06ea964	358	#define OPTION_NO_WCHAR_SIZE_WARNING 312
68fcca92	359	#define OPTION_FIX_ERRATUM_835769 313
4106101c	360	#define OPTION_FIX_ERRATUM_843419 314
1f56df9d	361	#define OPTION_NO_APPLY_DYNAMIC_RELOCS 315
a06ea964 NC	362	'
	363
	364	PARSE_AND_LIST_SHORTOPTS=p
	365
	366	PARSE_AND_LIST_LONGOPTS='
	367	{ "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
	368	{ "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING},
	369	{ "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER},
	370	{ "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
	371	{ "no-wchar-size-warning", no_argument, NULL, OPTION_NO_WCHAR_SIZE_WARNING},
68fcca92	372	{ "fix-cortex-a53-835769", no_argument, NULL, OPTION_FIX_ERRATUM_835769},
739b5c9c	373	{ "fix-cortex-a53-843419", optional_argument, NULL, OPTION_FIX_ERRATUM_843419},
1f56df9d	374	{ "no-apply-dynamic-relocs", no_argument, NULL, OPTION_NO_APPLY_DYNAMIC_RELOCS},
a06ea964 NC	375	'
	376
	377	PARSE_AND_LIST_OPTIONS='
	378	fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible\n"
	379	" enum sizes\n"));
eca4b721	380	fprintf (file, _(" --no-wchar-size-warning Don'\''t warn about objects with incompatible\n"
a06ea964 NC	381	" wchar_t sizes\n"));
	382	fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n"));
	383	fprintf (file, _("\
df5f2391 AM	384	--stub-group-size=N Maximum size of a group of input sections that\n\
	385	can be handled by one stub section. A negative\n\
	386	value locates all stubs after their branches\n\
	387	(with a group size of -N), while a positive\n\
	388	value allows two groups of input sections, one\n\
	389	before, and one after each stub section.\n\
	390	Values of +/-1 indicate the linker should\n\
	391	choose suitable defaults.\n"));
68fcca92	392	fprintf (file, _(" --fix-cortex-a53-835769 Fix erratum 835769\n"));
739b5c9c TC	393	fprintf (file, _("\
	394	--fix-cortex-a53-843419[=full\|adr\|adrp] Fix erratum 843419 and optionally specify which workaround to use.\n\
	395	full (default): Use both ADRP and ADR workaround, this will \n\
	396	increase the size of your binaries.\n\
	397	adr: Only use the ADR workaround, this will not cause any increase\n\
	398	in binary size but linking will fail if the referenced address is\n\
	399	out of range of an ADR instruction. This will remove the need of using\n\
	400	a veneer and results in both performance and size benefits.\n\
	401	adrp: Use only the ADRP workaround, this will never rewrite your ADRP\n\
	402	instruction into an ADR. As such the workaround will always use a\n\
	403	veneer and this will give you both a performance and size overhead.\n"));
df5f2391	404	fprintf (file, _(" --no-apply-dynamic-relocs Do not apply link-time values for dynamic relocations\n"));
8bf6d176 SD	405	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	406	fprintf (file, _(" -z pac-plt Protect PLTs with Pointer Authentication.\n"));
a06ea964 NC	407	'
a06ea964 NC	408
8bf6d176 SD	409	PARSE_AND_LIST_ARGS_CASE_Z_AARCH64='
	410	else if (strcmp (optarg, "force-bti") == 0)
	411	{
	412	plt_type \|= PLT_BTI;
	413	bti_type = BTI_WARN;
	414	}
	415	else if (strcmp (optarg, "pac-plt") == 0)
	416	plt_type \|= PLT_PAC;
	417	'
	418	PARSE_AND_LIST_ARGS_CASE_Z="$PARSE_AND_LIST_ARGS_CASE_Z $PARSE_AND_LIST_ARGS_CASE_Z_AARCH64"
	419
a06ea964 NC	420	PARSE_AND_LIST_ARGS_CASES='
	421	case '\'p\'':
	422	/* Only here for backwards compatibility. */
	423	break;
	424
	425	case OPTION_NO_ENUM_SIZE_WARNING:
	426	no_enum_size_warning = 1;
	427	break;
	428
	429	case OPTION_NO_WCHAR_SIZE_WARNING:
	430	no_wchar_size_warning = 1;
	431	break;
	432
	433	case OPTION_PIC_VENEER:
	434	pic_veneer = 1;
	435	break;
	436
68fcca92 JW	437	case OPTION_FIX_ERRATUM_835769:
	438	fix_erratum_835769 = 1;
	439	break;
	440
4106101c	441	case OPTION_FIX_ERRATUM_843419:
739b5c9c TC	442	fix_erratum_843419 = ERRAT_ADR \| ERRAT_ADRP;
	443	if (optarg && *optarg)
	444	{
	445	if (strcmp ("full", optarg) == 0)
	446	fix_erratum_843419 = ERRAT_ADR \| ERRAT_ADRP;
	447	else if (strcmp ("adrp", optarg) == 0)
	448	fix_erratum_843419 = ERRAT_ADRP;
	449	else if (strcmp ("adr", optarg) == 0)
	450	fix_erratum_843419 = ERRAT_ADR;
	451	else
	452	einfo (_("%P: error: unrecognized option for "
	453	"--fix-cortex-a53-843419: %s\n"), optarg);
	454	}
4106101c MS	455	break;
4106101c MS	456
1f56df9d JW	457	case OPTION_NO_APPLY_DYNAMIC_RELOCS:
	458	no_apply_dynamic_relocs = 1;
	459	break;
	460
a06ea964 NC	461	case OPTION_STUBGROUP_SIZE:
	462	{
	463	const char *end;
	464
6c19b93b AM	465	group_size = bfd_scan_vma (optarg, &end, 0);
6c19b93b AM	466	if (*end)
df5f2391	467	einfo (_("%F%P: invalid number `%s'\''\n"), optarg);
a06ea964 NC	468	}
	469	break;
	470	'
	471
	472	# We have our own before_allocation etc. functions, but they call
	473	# the standard routines, so give them a different name.
	474	LDEMUL_BEFORE_ALLOCATION=aarch64_elf_before_allocation
	475	LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
	476	LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=aarch64_elf_create_output_section_statements
	477
	478	# Replace the elf before_parse function with our own.
	479	LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
	480
	481	# Call the extra arm-elf function
	482	LDEMUL_FINISH=gld${EMULATION_NAME}_finish