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author | Sandra Loosemore <sandra@codesourcery.com> | 2014-01-30 17:47:07 -0800 |
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committer | Sandra Loosemore <sandra@codesourcery.com> | 2014-01-30 17:47:07 -0800 |
commit | 78058a5e4f09f6ed49039d6014b1266e229e1f49 (patch) | |
tree | 11a23a22085d9fab98d35e9da10f39895d8bcf78 /ld/emultempl/nios2elf.em | |
parent | 1b4f7b4d1e4566ff8e75a6ad7472da15ec31ce7a (diff) | |
download | fsf-binutils-gdb-78058a5e4f09f6ed49039d6014b1266e229e1f49.zip fsf-binutils-gdb-78058a5e4f09f6ed49039d6014b1266e229e1f49.tar.gz fsf-binutils-gdb-78058a5e4f09f6ed49039d6014b1266e229e1f49.tar.bz2 |
Nios II CALL26 linker relaxation
2014-01-30 Sandra Loosemore <sandra@codesourcery.com>
bfd/
* bfd-in2.h: Update from reloc.c.
* elf32-nios2.c: Include elf32-nios2.h.
(elf_nios2_howto_table_rel): Add entry for R_NIOS2_CALL26_NOAT.
(nios2_reloc_map): Likewise.
(enum elf32_nios2_stub_type): Declare.
(struct elf32_nios2_stub_hash_entry): Declare.
(nios2_stub_hash_entry, nios2_stub_hash_lookup): New macros.
(struct elf32_nios2_link_hash_entry): Add hsh_cache field.
(struct elf32_nios2_link_hash_table): Add new fields bstab,
stub_bfd, add_stub_section, layout_sections_again, stub_group,
bfd_count, top_index, input_list, all_local_syms.
(nios2_call26_stub_entry): New.
(nios2_elf32_install_imm16): Move up in file.
(nios2_elf32_install_data): Move up in file.
(hiadj): Move up in file.
(stub_hash_newfunc): New.
(link_hash_newfunc): Initialize hsh_cache field.
(STUB_SUFFIX): New.
(nios2_stub_name): New.
(nios2_get_stub_entry): New.
(nios2_add_stub): New.
(nios2_elf32_setup_section_lists): New.
(nios2_elf32_next_input_section): New.
(CALL26_SEGMENT): New.
(MAX_STUB_SECTION_SIZE): New.
(group_sections): New.
(nios2_type_of_stub): New.
(nios2_build_one_stub): New.
(nios2_size_one_stub): New.
(get_local_syms): New.
(nios2_elf32_size_stubs): New.
(nios2_elf32_build_stubs): New.
(nios2_elf32_do_call26_relocate): Correct CALL26 overflow test.
(nios2_elf32_relocate_section): Handle R_NIOS2_CALL26_NOAT. Add
trampolines for R_NIOS2_CALL26 stubs.
(nios2_elf32_check_relocs): Handle R_NIOS2_CALL26_NOAT.
(nios2_elf32_gc_sweep_hook): Likewise.
(nios2_elf32_link_hash_table_create): Initialize the stub hash table.
(nios2_elf32_link_hash_table_free): New.
(bfd_elf32_bfd_link_hash_table_free): Define.
* elf32-nios2.h: New file.
* libbfd.h: Update from reloc.c.
* reloc.c (BFD_RELOC_NIOS2_CALL26_NOAT): New.
gas/
* config/tc-nios2.c (md_apply_fix): Handle BFD_RELOC_NIOS2_CALL26_NOAT.
(nios2_assemble_args_m): Likewise.
(md_assemble): Likewise.
gas/testsuite/
* gas/nios2/call26_noat.d: New.
* gas/nios2/call26_noat.s: New.
* gas/nios2/call_noat.d: New.
* gas/nios2/call_noat.s: New.
include/elf/
* nios2.h (elf_nios2_reloc_type): Add R_NIOS2_CALL26_NOAT.
ld/
* Makefile.am (enios2elf.c, enios2linux.c): Update dependencies.
* Makefile.in: Regenerated.
* emulparams/nios2elf.sh (EXTRA_EM_FILE): Set.
* emulparams/nios2linux.sh (EXTRA_EM_FILE): Set.
* emultempl/nios2elf.em: New file.
* gen-doc.texi (NIOSII): Set.
* ld.texinfo (NIOSII): Set.
ld/testsuite/
* ld-nios2/relax_call26.s: New.
* ld-nios2/relax_call26_boundary.ld: New.
* ld-nios2/relax_call26_boundary.s: New.
* ld-nios2/relax_call26_boundary_c8.d: New.
* ld-nios2/relax_call26_boundary_cc.d: New.
* ld-nios2/relax_call26_boundary_d0.d: New.
* ld-nios2/relax_call26_boundary_d4.d: New.
* ld-nios2/relax_call26_boundary_d8.d: New.
* ld-nios2/relax_call26_boundary_dc.d: New.
* ld-nios2/relax_call26_boundary_f0.d: New.
* ld-nios2/relax_call26_boundary_f4.d: New.
* ld-nios2/relax_call26_boundary_f8.d: New.
* ld-nios2/relax_call26_boundary_fc.d: New.
* ld-nios2/relax_call26_cache.d: New.
* ld-nios2/relax_call26_cache.ld: New.
* ld-nios2/relax_call26_cache.s: New.
* ld-nios2/relax_call26_multi.d: New.
* ld-nios2/relax_call26_multi.ld: New.
* ld-nios2/relax_call26_norelax.d: New.
* ld-nios2/relax_call26_shared.d: New.
* ld-nios2/relax_call26_shared.ld: New.
Diffstat (limited to 'ld/emultempl/nios2elf.em')
-rw-r--r-- | ld/emultempl/nios2elf.em | 317 |
1 files changed, 317 insertions, 0 deletions
diff --git a/ld/emultempl/nios2elf.em b/ld/emultempl/nios2elf.em new file mode 100644 index 0000000..c86eba1 --- /dev/null +++ b/ld/emultempl/nios2elf.em @@ -0,0 +1,317 @@ +# 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 bfd_elf32_littlenios2_vec, bfd_elf32_bignios2_vec; + + if (link_info.output_bfd->xvec != &bfd_elf32_littlenios2_vec + && link_info.output_bfd->xvec != &bfd_elf32_bignios2_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) +{ + /* 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. */ + if (bfd_elf_discard_info (link_info.output_bfd, &link_info)) + 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) + { + int 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 |