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- # This shell script emits a C file. -*- C -*-
- # Copyright (C) 2013-2022 Free Software Foundation, Inc.
- #
- # This file is part of 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; if not, write to the Free Software
- # Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
- # MA 02110-1301, USA.
- #
- # This file is sourced from elf.em, and defines extra Nios II ELF
- # specific routines. Taken from metagelf.em.
- #
- fragment <<EOF
- #include "ldctor.h"
- #include "elf32-nios2.h"
- /* Fake input file for stubs. */
- static lang_input_statement_type *stub_file;
- /* Whether we need to call nios2_layout_sections_again. */
- static int need_laying_out = 0;
- /* This is called before the input files are opened. We create a new
- fake input file to hold the stub sections. */
- static void
- nios2elf_create_output_section_statements (void)
- {
- extern const bfd_target nios2_elf32_le_vec, nios2_elf32_be_vec;
- if (link_info.output_bfd->xvec != &nios2_elf32_le_vec
- && link_info.output_bfd->xvec != &nios2_elf32_be_vec)
- return;
- /* If --no-relax was not explicitly specified by the user, enable
- relaxation. If it's not enabled (either explicitly or by default),
- we're done, as we won't need to create any stubs. */
- if (!bfd_link_relocatable (&link_info) && RELAXATION_DISABLED_BY_DEFAULT)
- ENABLE_RELAXATION;
- if (!RELAXATION_ENABLED)
- return;
- 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);
- }
- 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 bool
- hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp,
- bool afterp)
- {
- lang_statement_union_type *l;
- bool 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, afterp);
- if (ret)
- return ret;
- break;
- case lang_output_section_statement_enum:
- ret = hook_in_stub (info,
- &l->output_section_statement.children.head,
- afterp);
- if (ret)
- return ret;
- break;
- case lang_wild_statement_enum:
- ret = hook_in_stub (info, &l->wild_statement.children.head, afterp);
- if (ret)
- return ret;
- break;
- case lang_group_statement_enum:
- ret = hook_in_stub (info, &l->group_statement.children.head, afterp);
- 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
- before or after its associated input section. */
- if (afterp)
- {
- *(info->add.tail) = l->header.next;
- l->header.next = info->add.head;
- }
- else
- {
- *lp = info->add.head;
- *(info->add.tail) = l;
- }
- 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 elf32_nios2_size_stubs. */
- /* Create a new stub section, and arrange for it to be linked
- immediately before or after INPUT_SECTION, according to AFTERP. */
- static asection *
- nios2elf_add_stub_section (const char *stub_sec_name, asection *input_section,
- bool afterp)
- {
- asection *stub_sec;
- flagword flags;
- asection *output_section;
- const char *secname;
- 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;
- output_section = input_section->output_section;
- secname = bfd_section_name (output_section);
- os = lang_output_section_find (secname);
- info.input_section = input_section;
- lang_list_init (&info.add);
- lang_add_section (&info.add, stub_sec, NULL, NULL, os);
- if (info.add.head == NULL)
- goto err_ret;
- if (hook_in_stub (&info, &os->children.head, afterp))
- return stub_sec;
- err_ret:
- einfo (_("%X%P: can not make stub section: %E\n"));
- return NULL;
- }
- /* Another call-back for elf32_nios2_size_stubs. */
- static void
- nios2elf_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 (i->sec_info_type != SEC_INFO_TYPE_JUST_SYMS
- && (i->flags & SEC_EXCLUDE) == 0
- && i->output_section != NULL
- && i->output_section->owner == link_info.output_bfd)
- {
- nios2_elf32_next_input_section (&link_info, i);
- }
- }
- }
- /* For Nios II we use this opportunity to build linker stubs. */
- static void
- gld${EMULATION_NAME}_after_allocation (void)
- {
- int ret;
- /* bfd_elf_discard_info just plays with data and debugging sections,
- ie. doesn't affect code size, so we can delay resizing the
- sections. It's likely we'll resize everything in the process of
- adding stubs. */
- ret = bfd_elf_discard_info (link_info.output_bfd, &link_info);
- if (ret < 0)
- {
- einfo (_("%X%P: .eh_frame/.stab edit: %E\n"));
- return;
- }
- else if (ret > 0)
- need_laying_out = 1;
- /* If generating a relocatable output file, then we don't
- have to examine the relocs. */
- if (stub_file != NULL
- && !bfd_link_relocatable (&link_info)
- && RELAXATION_ENABLED)
- {
- ret = nios2_elf32_setup_section_lists (link_info.output_bfd, &link_info);
- if (ret != 0)
- {
- if (ret < 0)
- {
- einfo (_("%X%P: can not size stub section: %E\n"));
- return;
- }
- lang_for_each_statement (build_section_lists);
- /* Call into the BFD backend to do the real work. */
- if (! nios2_elf32_size_stubs (link_info.output_bfd,
- stub_file->the_bfd,
- &link_info,
- &nios2elf_add_stub_section,
- &nios2elf_layout_sections_again))
- {
- einfo (_("%X%P: can not size stub section: %E\n"));
- return;
- }
- }
- }
- if (need_laying_out != -1)
- ldelf_map_segments (need_laying_out);
- if (!bfd_link_relocatable (&link_info) && RELAXATION_ENABLED)
- {
- /* Now build the linker stubs. */
- if (stub_file != NULL && stub_file->the_bfd->sections != NULL)
- {
- if (! nios2_elf32_build_stubs (&link_info))
- einfo (_("%X%P: can not build stubs: %E\n"));
- }
- }
- }
- EOF
- # Put these extra nios2elf routines in ld_${EMULATION_NAME}_emulation
- #
- LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
- LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=nios2elf_create_output_section_statements
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