diff options
Diffstat (limited to 'binutils-2.25/ld/emultempl/nios2elf.em')
| -rw-r--r-- | binutils-2.25/ld/emultempl/nios2elf.em | 323 |
1 files changed, 323 insertions, 0 deletions
diff --git a/binutils-2.25/ld/emultempl/nios2elf.em b/binutils-2.25/ld/emultempl/nios2elf.em new file mode 100644 index 00000000..bdf54a3e --- /dev/null +++ b/binutils-2.25/ld/emultempl/nios2elf.em @@ -0,0 +1,323 @@ +# This shell script emits a C file. -*- C -*- +# Copyright (C) 2013-2014 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 (!link_info.relocatable && 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 && !link_info.relocatable && 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${EMULATION_NAME}_map_segments (need_laying_out); + + if (!link_info.relocatable && RELAXATION_ENABLED) + { + /* Now build the linker stubs. */ + if (stub_file != NULL && stub_file->the_bfd->sections != NULL) + { + if (! nios2_elf32_build_stubs (&link_info)) + einfo ("%X%P: can not build stubs: %E\n"); + } + } +} + + +/* Avoid processing the fake stub_file in vercheck, stat_needed and + check_needed routines. */ + +static void (*real_func) (lang_input_statement_type *); + +static void nios2_for_each_input_file_wrapper (lang_input_statement_type *l) +{ + if (l != stub_file) + (*real_func) (l); +} + +static void +nios2_lang_for_each_input_file (void (*func) (lang_input_statement_type *)) +{ + real_func = func; + lang_for_each_input_file (&nios2_for_each_input_file_wrapper); +} + +#define lang_for_each_input_file nios2_lang_for_each_input_file + +EOF + + +# Put these extra nios2elf routines in ld_${EMULATION_NAME}_emulation +# +LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation +LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=nios2elf_create_output_section_statements |