| # This shell script emits a C file. -*- C -*- |
| # Copyright (C) 2013-2017 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 elf32.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 ("%X%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 bfd_boolean |
| hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp, |
| bfd_boolean afterp) |
| { |
| 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, 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, |
| bfd_boolean 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_get_section_name (output_section->owner, 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, 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. */ |
| gld${EMULATION_NAME}_map_segments (TRUE); |
| need_laying_out = -1; |
| } |
| |
| |
| static void |
| build_section_lists (lang_statement_union_type *statement) |
| { |
| if (statement->header.type == lang_input_section_enum) |
| { |
| asection *i = statement->input_section.section; |
| |
| if (i->sec_info_type != SEC_INFO_TYPE_JUST_SYMS |
| && (i->flags & SEC_EXCLUDE) == 0 |
| && i->output_section != NULL |
| && i->output_section->owner == link_info.output_bfd) |
| { |
| nios2_elf32_next_input_section (&link_info, i); |
| } |
| } |
| } |
| |
| |
| /* For Nios II we use this opportunity to build linker stubs. */ |
| |
| static void |
| gld${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) |
| gld${EMULATION_NAME}_map_segments (need_laying_out); |
| |
| if (!bfd_link_relocatable (&link_info) && RELAXATION_ENABLED) |
| { |
| /* Now build the linker stubs. */ |
| if (stub_file != NULL && stub_file->the_bfd->sections != NULL) |
| { |
| if (! nios2_elf32_build_stubs (&link_info)) |
| einfo ("%X%P: can not build stubs: %E\n"); |
| } |
| } |
| } |
| |
| |
| /* Avoid processing the fake stub_file in vercheck, stat_needed and |
| check_needed routines. */ |
| |
| static void (*real_func) (lang_input_statement_type *); |
| |
| static void nios2_for_each_input_file_wrapper (lang_input_statement_type *l) |
| { |
| if (l != stub_file) |
| (*real_func) (l); |
| } |
| |
| static void |
| nios2_lang_for_each_input_file (void (*func) (lang_input_statement_type *)) |
| { |
| real_func = func; |
| lang_for_each_input_file (&nios2_for_each_input_file_wrapper); |
| } |
| |
| #define lang_for_each_input_file nios2_lang_for_each_input_file |
| |
| EOF |
| |
| |
| # Put these extra nios2elf routines in ld_${EMULATION_NAME}_emulation |
| # |
| LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation |
| LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=nios2elf_create_output_section_statements |