305 lines
8 KiB
Text
305 lines
8 KiB
Text
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# This shell script emits a C file. -*- C -*-
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# Copyright (C) 2013-2022 Free Software Foundation, Inc.
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#
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# This file is part of 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; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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# MA 02110-1301, USA.
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#
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# This file is sourced from elf.em, and defines extra Nios II ELF
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# specific routines. Taken from metagelf.em.
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#
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fragment <<EOF
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#include "ldctor.h"
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#include "elf32-nios2.h"
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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 nios2_layout_sections_again. */
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static int need_laying_out = 0;
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/* This is called before the input files are opened. We create a new
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fake input file to hold the stub sections. */
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static void
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nios2elf_create_output_section_statements (void)
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{
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extern const bfd_target nios2_elf32_le_vec, nios2_elf32_be_vec;
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if (link_info.output_bfd->xvec != &nios2_elf32_le_vec
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&& link_info.output_bfd->xvec != &nios2_elf32_be_vec)
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return;
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/* If --no-relax was not explicitly specified by the user, enable
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relaxation. If it's not enabled (either explicitly or by default),
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we're done, as we won't need to create any stubs. */
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if (!bfd_link_relocatable (&link_info) && RELAXATION_DISABLED_BY_DEFAULT)
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ENABLE_RELAXATION;
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if (!RELAXATION_ENABLED)
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return;
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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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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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bool afterp)
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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, afterp);
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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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afterp);
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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, afterp);
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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, afterp);
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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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before or after its associated input section. */
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if (afterp)
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{
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*(info->add.tail) = l->header.next;
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l->header.next = info->add.head;
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}
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else
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{
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*lp = info->add.head;
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*(info->add.tail) = l;
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}
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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 elf32_nios2_size_stubs. */
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/* Create a new stub section, and arrange for it to be linked
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immediately before or after INPUT_SECTION, according to AFTERP. */
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static asection *
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nios2elf_add_stub_section (const char *stub_sec_name, asection *input_section,
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bool afterp)
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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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const char *secname;
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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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output_section = input_section->output_section;
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secname = bfd_section_name (output_section);
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os = lang_output_section_find (secname);
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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, afterp))
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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 elf32_nios2_size_stubs. */
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static void
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nios2elf_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 (i->sec_info_type != SEC_INFO_TYPE_JUST_SYMS
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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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{
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nios2_elf32_next_input_section (&link_info, i);
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}
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}
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}
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/* For Nios II we use this opportunity to build linker stubs. */
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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_elf_discard_info just plays with data and debugging sections,
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ie. doesn't affect code size, 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
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&& !bfd_link_relocatable (&link_info)
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&& RELAXATION_ENABLED)
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{
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ret = nios2_elf32_setup_section_lists (link_info.output_bfd, &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: can not size stub section: %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 (! nios2_elf32_size_stubs (link_info.output_bfd,
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stub_file->the_bfd,
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&link_info,
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&nios2elf_add_stub_section,
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&nios2elf_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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if (!bfd_link_relocatable (&link_info) && RELAXATION_ENABLED)
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{
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/* Now build the linker stubs. */
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if (stub_file != NULL && stub_file->the_bfd->sections != NULL)
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{
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if (! nios2_elf32_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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}
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EOF
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# Put these extra nios2elf routines in ld_${EMULATION_NAME}_emulation
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#
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LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
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LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=nios2elf_create_output_section_statements
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