487 lines
16 KiB
Text
487 lines
16 KiB
Text
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# This shell script emits a C file. -*- C -*-
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# Copyright (C) 2009-2022 Free Software Foundation, Inc.
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# Contributed by ARM Ltd.
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#
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# This file is part of the GNU Binutils.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the license, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; see the file COPYING3. If not,
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# see <http://www.gnu.org/licenses/>.
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#
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# This file is sourced from elf.em, and defines extra aarch64-elf
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# specific routines.
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#
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fragment <<EOF
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#include "ldctor.h"
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#include "elf/aarch64.h"
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#include "elfxx-aarch64.h"
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static int no_enum_size_warning = 0;
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static int no_wchar_size_warning = 0;
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static int pic_veneer = 0;
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static int fix_erratum_835769 = 0;
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static erratum_84319_opts fix_erratum_843419 = ERRAT_NONE;
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static int no_apply_dynamic_relocs = 0;
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static aarch64_plt_type plt_type = PLT_NORMAL;
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static aarch64_enable_bti_type bti_type = BTI_NONE;
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static void
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gld${EMULATION_NAME}_before_parse (void)
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{
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#ifndef TARGET_ /* I.e., if not generic. */
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ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
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#endif /* not TARGET_ */
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input_flags.dynamic = ${DYNAMIC_LINK-true};
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config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo true ; else echo false ; fi`;
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config.separate_code = `if test "x${SEPARATE_CODE}" = xyes ; then echo true ; else echo false ; fi`;
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link_info.check_relocs_after_open_input = true;
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EOF
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if test -n "$COMMONPAGESIZE"; then
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fragment <<EOF
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link_info.relro = DEFAULT_LD_Z_RELRO;
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EOF
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fi
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fragment <<EOF
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link_info.separate_code = DEFAULT_LD_Z_SEPARATE_CODE;
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link_info.warn_execstack = DEFAULT_LD_WARN_EXECSTACK;
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link_info.no_warn_rwx_segments = ! DEFAULT_LD_WARN_RWX_SEGMENTS;
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link_info.default_execstack = DEFAULT_LD_EXECSTACK;
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}
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static void
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aarch64_elf_before_allocation (void)
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{
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/* We should be able to set the size of the interworking stub section. We
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can't do it until later if we have dynamic sections, though. */
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if (! elf_hash_table (&link_info)->dynamic_sections_created)
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{
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/* Here we rummage through the found bfds to collect information. */
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LANG_FOR_EACH_INPUT_STATEMENT (is)
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{
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/* Initialise mapping tables for code/data. */
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bfd_elf${ELFSIZE}_aarch64_init_maps (is->the_bfd);
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}
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}
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/* Call the standard elf routine. */
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gld${EMULATION_NAME}_before_allocation ();
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}
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/* Fake input file for stubs. */
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static lang_input_statement_type *stub_file;
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/* Whether we need to call gldarm_layout_sections_again. */
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static int need_laying_out = 0;
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/* Maximum size of a group of input sections that can be handled by
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one stub section. A value of +/-1 indicates the bfd back-end
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should use a suitable default size. */
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static bfd_signed_vma group_size = 1;
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struct hook_stub_info
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{
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lang_statement_list_type add;
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asection *input_section;
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};
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/* Traverse the linker tree to find the spot where the stub goes. */
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static bool
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hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
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{
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lang_statement_union_type *l;
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bool ret;
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for (; (l = *lp) != NULL; lp = &l->header.next)
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{
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switch (l->header.type)
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{
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case lang_constructors_statement_enum:
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ret = hook_in_stub (info, &constructor_list.head);
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if (ret)
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return ret;
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break;
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case lang_output_section_statement_enum:
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ret = hook_in_stub (info,
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&l->output_section_statement.children.head);
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if (ret)
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return ret;
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break;
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case lang_wild_statement_enum:
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ret = hook_in_stub (info, &l->wild_statement.children.head);
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if (ret)
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return ret;
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break;
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case lang_group_statement_enum:
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ret = hook_in_stub (info, &l->group_statement.children.head);
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if (ret)
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return ret;
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break;
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case lang_input_section_enum:
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if (l->input_section.section == info->input_section)
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{
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/* We've found our section. Insert the stub immediately
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after its associated input section. */
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*(info->add.tail) = l->header.next;
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l->header.next = info->add.head;
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return true;
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}
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break;
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case lang_data_statement_enum:
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case lang_reloc_statement_enum:
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case lang_object_symbols_statement_enum:
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case lang_output_statement_enum:
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case lang_target_statement_enum:
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case lang_input_statement_enum:
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case lang_assignment_statement_enum:
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case lang_padding_statement_enum:
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case lang_address_statement_enum:
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case lang_fill_statement_enum:
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break;
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default:
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FAIL ();
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break;
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}
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}
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return false;
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}
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/* Call-back for elf${ELFSIZE}_aarch64_size_stubs. */
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/* Create a new stub section, and arrange for it to be linked
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immediately after INPUT_SECTION. */
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static asection *
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elf${ELFSIZE}_aarch64_add_stub_section (const char *stub_sec_name,
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asection *input_section)
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{
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asection *stub_sec;
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flagword flags;
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asection *output_section;
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lang_output_section_statement_type *os;
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struct hook_stub_info info;
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flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
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| SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
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stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
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stub_sec_name, flags);
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if (stub_sec == NULL)
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goto err_ret;
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/* Long branch stubs contain a 64-bit address, so the section requires
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8 byte alignment. */
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bfd_set_section_alignment (stub_sec, 3);
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output_section = input_section->output_section;
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os = lang_output_section_get (output_section);
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info.input_section = input_section;
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lang_list_init (&info.add);
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lang_add_section (&info.add, stub_sec, NULL, NULL, os);
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if (info.add.head == NULL)
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goto err_ret;
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if (hook_in_stub (&info, &os->children.head))
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return stub_sec;
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err_ret:
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einfo (_("%X%P: can not make stub section: %E\n"));
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return NULL;
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}
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/* Another call-back for elf${ELFSIZE}_aarch64_size_stubs. */
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static void
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gldaarch64_layout_sections_again (void)
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{
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/* If we have changed sizes of the stub sections, then we need
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to recalculate all the section offsets. This may mean we need to
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add even more stubs. */
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ldelf_map_segments (true);
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need_laying_out = -1;
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}
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static void
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build_section_lists (lang_statement_union_type *statement)
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{
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if (statement->header.type == lang_input_section_enum)
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{
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asection *i = statement->input_section.section;
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if (!bfd_input_just_syms (i->owner)
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&& (i->flags & SEC_EXCLUDE) == 0
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&& i->output_section != NULL
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&& i->output_section->owner == link_info.output_bfd)
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elf${ELFSIZE}_aarch64_next_input_section (& link_info, i);
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}
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}
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static void
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gld${EMULATION_NAME}_after_allocation (void)
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{
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int ret;
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/* bfd_elf32_discard_info just plays with debugging sections,
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ie. doesn't affect any code, so we can delay resizing the
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sections. It's likely we'll resize everything in the process of
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adding stubs. */
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ret = bfd_elf_discard_info (link_info.output_bfd, & link_info);
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if (ret < 0)
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{
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einfo (_("%X%P: .eh_frame/.stab edit: %E\n"));
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return;
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}
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else if (ret > 0)
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need_laying_out = 1;
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/* If generating a relocatable output file, then we don't
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have to examine the relocs. */
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if (stub_file != NULL && !bfd_link_relocatable (&link_info))
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{
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ret = elf${ELFSIZE}_aarch64_setup_section_lists (link_info.output_bfd,
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&link_info);
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if (ret != 0)
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{
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if (ret < 0)
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{
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einfo (_("%X%P: could not compute sections lists "
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"for stub generation: %E\n"));
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return;
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}
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lang_for_each_statement (build_section_lists);
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/* Call into the BFD backend to do the real work. */
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if (! elf${ELFSIZE}_aarch64_size_stubs (link_info.output_bfd,
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stub_file->the_bfd,
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& link_info,
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group_size,
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& elf${ELFSIZE}_aarch64_add_stub_section,
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& gldaarch64_layout_sections_again))
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{
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einfo (_("%X%P: can not size stub section: %E\n"));
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return;
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}
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}
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}
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if (need_laying_out != -1)
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ldelf_map_segments (need_laying_out);
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}
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static void
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gld${EMULATION_NAME}_finish (void)
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{
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if (!bfd_link_relocatable (&link_info))
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{
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/* Now build the linker stubs. */
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if (stub_file->the_bfd->sections != NULL)
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{
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if (! elf${ELFSIZE}_aarch64_build_stubs (& link_info))
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einfo (_("%X%P: can not build stubs: %E\n"));
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}
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}
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finish_default ();
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}
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/* This is a convenient point to tell BFD about target specific flags.
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After the output has been created, but before inputs are read. */
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static void
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aarch64_elf_create_output_section_statements (void)
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{
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if (strstr (bfd_get_target (link_info.output_bfd), "aarch64") == NULL)
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{
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/* The arm backend needs special fields in the output hash structure.
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These will only be created if the output format is an arm format,
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hence we do not support linking and changing output formats at the
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same time. Use a link followed by objcopy to change output formats. */
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einfo (_("%F%P: error: cannot change output format "
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"whilst linking %s binaries\n"), "AArch64");
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return;
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}
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aarch64_bti_pac_info bp_info;
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bp_info.plt_type = plt_type;
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bp_info.bti_type = bti_type;
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bfd_elf${ELFSIZE}_aarch64_set_options (link_info.output_bfd, &link_info,
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no_enum_size_warning,
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no_wchar_size_warning,
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pic_veneer,
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||
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fix_erratum_835769, fix_erratum_843419,
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no_apply_dynamic_relocs,
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bp_info);
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stub_file = lang_add_input_file ("linker stubs",
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lang_input_file_is_fake_enum,
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NULL);
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stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
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if (stub_file->the_bfd == NULL
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|| ! bfd_set_arch_mach (stub_file->the_bfd,
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bfd_get_arch (link_info.output_bfd),
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bfd_get_mach (link_info.output_bfd)))
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{
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einfo (_("%F%P: can not create BFD: %E\n"));
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return;
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}
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stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
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ldlang_add_file (stub_file);
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}
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EOF
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||
|
|
|
||
|
|
# Define some shell vars to insert bits of code into the standard elf
|
||
|
|
# parse_args and list_options functions.
|
||
|
|
#
|
||
|
|
PARSE_AND_LIST_PROLOGUE='
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||
|
|
#define OPTION_NO_ENUM_SIZE_WARNING 309
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#define OPTION_PIC_VENEER 310
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#define OPTION_STUBGROUP_SIZE 311
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#define OPTION_NO_WCHAR_SIZE_WARNING 312
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#define OPTION_FIX_ERRATUM_835769 313
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#define OPTION_FIX_ERRATUM_843419 314
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||
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#define OPTION_NO_APPLY_DYNAMIC_RELOCS 315
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'
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|
|
||
|
|
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
|