| # This shell script emits a C file. -*- C -*- |
| # Copyright 2002, 2003, 2004, 2005 Free Software Foundation, Inc. |
| # |
| # This file is part of GLD, the Gnu Linker. |
| # |
| # 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 2 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 powerpc64-elf |
| # specific routines. |
| # |
| cat >>e${EMULATION_NAME}.c <<EOF |
| |
| #include "ldctor.h" |
| #include "libbfd.h" |
| #include "elf-bfd.h" |
| #include "elf64-ppc.h" |
| |
| /* Fake input file for stubs. */ |
| static lang_input_statement_type *stub_file; |
| static int stub_added = 0; |
| |
| /* Whether we need to call ppc_layout_sections_again. */ |
| static int need_laying_out = 0; |
| |
| /* Maximum size of a group of input sections that can be handled by |
| one stub section. A value of +/-1 indicates the bfd back-end |
| should use a suitable default size. */ |
| static bfd_signed_vma group_size = 1; |
| |
| /* Whether to add ".foo" entries for each "foo" in a version script. */ |
| static int dotsyms = 1; |
| |
| /* Whether to run tls optimization. */ |
| static int no_tls_opt = 0; |
| |
| /* Whether to run opd optimization. */ |
| static int no_opd_opt = 0; |
| |
| /* Whether to run toc optimization. */ |
| static int no_toc_opt = 0; |
| |
| /* Whether to allow multiple toc sections. */ |
| static int no_multi_toc = 0; |
| |
| /* Whether to emit symbols for stubs. */ |
| static int emit_stub_syms = 0; |
| |
| static asection *toc_section = 0; |
| |
| /* Whether to canonicalize .opd so that there are no overlapping |
| .opd entries. */ |
| static int non_overlapping_opd = 0; |
| |
| /* This is called before the input files are opened. We create a new |
| fake input file to hold the stub sections. */ |
| |
| static void |
| ppc_create_output_section_statements (void) |
| { |
| extern const bfd_target bfd_elf64_powerpc_vec; |
| extern const bfd_target bfd_elf64_powerpcle_vec; |
| |
| if (link_info.hash->creator != &bfd_elf64_powerpc_vec |
| && link_info.hash->creator != &bfd_elf64_powerpcle_vec) |
| return; |
| |
| link_info.wrap_char = '.'; |
| |
| stub_file = lang_add_input_file ("linker stubs", |
| lang_input_file_is_fake_enum, |
| NULL); |
| stub_file->the_bfd = bfd_create ("linker stubs", output_bfd); |
| if (stub_file->the_bfd == NULL |
| || !bfd_set_arch_mach (stub_file->the_bfd, |
| bfd_get_arch (output_bfd), |
| bfd_get_mach (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); |
| ppc64_elf_init_stub_bfd (stub_file->the_bfd, &link_info); |
| } |
| |
| static void |
| ppc_before_allocation (void) |
| { |
| if (stub_file != NULL) |
| { |
| if (!no_opd_opt |
| && !ppc64_elf_edit_opd (output_bfd, &link_info, non_overlapping_opd)) |
| einfo ("%X%P: can not edit %s %E\n", "opd"); |
| |
| if (ppc64_elf_tls_setup (output_bfd, &link_info) && !no_tls_opt) |
| { |
| /* Size the sections. This is premature, but we want to know the |
| TLS segment layout so that certain optimizations can be done. */ |
| lang_size_sections (stat_ptr->head, abs_output_section, |
| &stat_ptr->head, 0, 0, NULL, TRUE); |
| |
| if (!ppc64_elf_tls_optimize (output_bfd, &link_info)) |
| einfo ("%X%P: TLS problem %E\n"); |
| |
| /* We must not cache anything from the preliminary sizing. */ |
| elf_tdata (output_bfd)->program_header_size = 0; |
| lang_reset_memory_regions (); |
| } |
| |
| if (!no_toc_opt |
| && !link_info.relocatable |
| && !ppc64_elf_edit_toc (output_bfd, &link_info)) |
| einfo ("%X%P: can not edit %s %E\n", "toc"); |
| } |
| |
| gld${EMULATION_NAME}_before_allocation (); |
| } |
| |
| 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) |
| { |
| 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); |
| if (ret) |
| return ret; |
| break; |
| |
| case lang_output_section_statement_enum: |
| ret = hook_in_stub (info, |
| &l->output_section_statement.children.head); |
| if (ret) |
| return ret; |
| break; |
| |
| case lang_wild_statement_enum: |
| ret = hook_in_stub (info, &l->wild_statement.children.head); |
| if (ret) |
| return ret; |
| break; |
| |
| case lang_group_statement_enum: |
| ret = hook_in_stub (info, &l->group_statement.children.head); |
| 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 its associated input section. */ |
| *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 ppc64_elf_size_stubs. */ |
| |
| /* Create a new stub section, and arrange for it to be linked |
| immediately before INPUT_SECTION. */ |
| |
| static asection * |
| ppc_add_stub_section (const char *stub_sec_name, asection *input_section) |
| { |
| asection *stub_sec; |
| flagword flags; |
| asection *output_section; |
| const char *secname; |
| lang_output_section_statement_type *os; |
| struct hook_stub_info info; |
| |
| stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name); |
| if (stub_sec == NULL) |
| goto err_ret; |
| |
| flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE |
| | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP); |
| if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags)) |
| 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, os, stub_file); |
| |
| if (info.add.head == NULL) |
| goto err_ret; |
| |
| stub_added = 1; |
| if (hook_in_stub (&info, &os->children.head)) |
| return stub_sec; |
| |
| err_ret: |
| einfo ("%X%P: can not make stub section: %E\n"); |
| return NULL; |
| } |
| |
| |
| /* Another call-back for ppc64_elf_size_stubs. */ |
| |
| static void |
| ppc_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. */ |
| need_laying_out = 0; |
| |
| gld${EMULATION_NAME}_layout_sections_again (); |
| } |
| |
| |
| /* Call the back-end function to set TOC base after we have placed all |
| the sections. */ |
| static void |
| gld${EMULATION_NAME}_after_allocation (void) |
| { |
| if (!link_info.relocatable) |
| _bfd_set_gp_value (output_bfd, ppc64_elf_toc (output_bfd)); |
| } |
| |
| |
| static void |
| build_toc_list (lang_statement_union_type *statement) |
| { |
| if (statement->header.type == lang_input_section_enum |
| && !statement->input_section.ifile->just_syms_flag |
| && (statement->input_section.section->flags & SEC_EXCLUDE) == 0 |
| && statement->input_section.section->output_section == toc_section) |
| ppc64_elf_next_toc_section (&link_info, statement->input_section.section); |
| } |
| |
| |
| static void |
| build_section_lists (lang_statement_union_type *statement) |
| { |
| if (statement->header.type == lang_input_section_enum |
| && !statement->input_section.ifile->just_syms_flag |
| && (statement->input_section.section->flags & SEC_EXCLUDE) == 0 |
| && statement->input_section.section->output_section != NULL |
| && statement->input_section.section->output_section->owner == output_bfd) |
| { |
| if (!ppc64_elf_next_input_section (&link_info, |
| statement->input_section.section)) |
| einfo ("%X%P: can not size stub section: %E\n"); |
| } |
| } |
| |
| |
| /* Final emulation specific call. */ |
| |
| static void |
| ppc_finish (void) |
| { |
| /* e_entry on PowerPC64 points to the function descriptor for |
| _start. If _start is missing, default to the first function |
| descriptor in the .opd section. */ |
| entry_section = ".opd"; |
| |
| /* bfd_elf_discard_info just plays with debugging sections, |
| ie. doesn't affect any code, 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 (output_bfd, &link_info)) |
| need_laying_out = 1; |
| |
| /* If generating a relocatable output file, then we don't have any |
| stubs. */ |
| if (stub_file != NULL && !link_info.relocatable) |
| { |
| int ret = ppc64_elf_setup_section_lists (output_bfd, &link_info, |
| no_multi_toc); |
| if (ret < 0) |
| einfo ("%X%P: can not size stub section: %E\n"); |
| else if (ret > 0) |
| { |
| toc_section = bfd_get_section_by_name (output_bfd, ".got"); |
| if (toc_section != NULL) |
| lang_for_each_statement (build_toc_list); |
| |
| ppc64_elf_reinit_toc (output_bfd, &link_info); |
| |
| lang_for_each_statement (build_section_lists); |
| |
| /* Call into the BFD backend to do the real work. */ |
| if (!ppc64_elf_size_stubs (output_bfd, |
| &link_info, |
| group_size, |
| &ppc_add_stub_section, |
| &ppc_layout_sections_again)) |
| einfo ("%X%P: can not size stub section: %E\n"); |
| } |
| } |
| |
| if (need_laying_out) |
| ppc_layout_sections_again (); |
| |
| if (link_info.relocatable) |
| { |
| asection *toc = bfd_get_section_by_name (output_bfd, ".toc"); |
| if (toc != NULL |
| && bfd_section_size (output_bfd, toc) > 0x10000) |
| einfo ("%X%P: TOC section size exceeds 64k\n"); |
| } |
| |
| if (stub_added) |
| { |
| char *msg = NULL; |
| char *line, *endline; |
| |
| emit_stub_syms |= link_info.emitrelocations; |
| if (!ppc64_elf_build_stubs (emit_stub_syms, &link_info, |
| config.stats ? &msg : NULL)) |
| einfo ("%X%P: can not build stubs: %E\n"); |
| |
| for (line = msg; line != NULL; line = endline) |
| { |
| endline = strchr (line, '\n'); |
| if (endline != NULL) |
| *endline++ = '\0'; |
| fprintf (stderr, "%s: %s\n", program_name, line); |
| } |
| if (msg != NULL) |
| free (msg); |
| } |
| |
| ppc64_elf_restore_symbols (&link_info); |
| gld${EMULATION_NAME}_strip_empty_sections (); |
| gld${EMULATION_NAME}_provide_init_fini_syms (); |
| } |
| |
| |
| /* Add a pattern matching ".foo" for every "foo" in a version script. |
| |
| The reason for doing this is that many shared library version |
| scripts export a selected set of functions or data symbols, forcing |
| others local. eg. |
| |
| . VERS_1 { |
| . global: |
| . this; that; some; thing; |
| . local: |
| . *; |
| . }; |
| |
| To make the above work for PowerPC64, we need to export ".this", |
| ".that" and so on, otherwise only the function descriptor syms are |
| exported. Lack of an exported function code sym may cause a |
| definition to be pulled in from a static library. */ |
| |
| static struct bfd_elf_version_expr * |
| gld${EMULATION_NAME}_new_vers_pattern (struct bfd_elf_version_expr *entry) |
| { |
| struct bfd_elf_version_expr *dot_entry; |
| unsigned int len; |
| char *dot_pat; |
| |
| if (!dotsyms || entry->pattern[0] == '*' || entry->pattern[0] == '.') |
| return entry; |
| |
| dot_entry = xmalloc (sizeof *dot_entry); |
| *dot_entry = *entry; |
| dot_entry->next = entry; |
| len = strlen (entry->pattern) + 2; |
| dot_pat = xmalloc (len); |
| dot_pat[0] = '.'; |
| memcpy (dot_pat + 1, entry->pattern, len - 1); |
| dot_entry->pattern = dot_pat; |
| if (entry->symbol != NULL) |
| { |
| len = strlen (entry->symbol) + 2; |
| dot_pat = xmalloc (len); |
| dot_pat[0] = '.'; |
| memcpy (dot_pat + 1, entry->symbol, len - 1); |
| dot_entry->symbol = dot_pat; |
| } |
| return dot_entry; |
| } |
| |
| |
| /* Avoid processing the fake stub_file in vercheck, stat_needed and |
| check_needed routines. */ |
| |
| static void (*real_func) (lang_input_statement_type *); |
| |
| static void ppc_for_each_input_file_wrapper (lang_input_statement_type *l) |
| { |
| if (l != stub_file) |
| (*real_func) (l); |
| } |
| |
| static void |
| ppc_lang_for_each_input_file (void (*func) (lang_input_statement_type *)) |
| { |
| real_func = func; |
| lang_for_each_input_file (&ppc_for_each_input_file_wrapper); |
| } |
| |
| #define lang_for_each_input_file ppc_lang_for_each_input_file |
| |
| EOF |
| |
| # Define some shell vars to insert bits of code into the standard elf |
| # parse_args and list_options functions. |
| # |
| PARSE_AND_LIST_PROLOGUE=' |
| #define OPTION_STUBGROUP_SIZE 301 |
| #define OPTION_STUBSYMS (OPTION_STUBGROUP_SIZE + 1) |
| #define OPTION_DOTSYMS (OPTION_STUBSYMS + 1) |
| #define OPTION_NO_DOTSYMS (OPTION_DOTSYMS + 1) |
| #define OPTION_NO_TLS_OPT (OPTION_NO_DOTSYMS + 1) |
| #define OPTION_NO_OPD_OPT (OPTION_NO_TLS_OPT + 1) |
| #define OPTION_NO_TOC_OPT (OPTION_NO_OPD_OPT + 1) |
| #define OPTION_NO_MULTI_TOC (OPTION_NO_TOC_OPT + 1) |
| #define OPTION_NON_OVERLAPPING_OPD (OPTION_NO_MULTI_TOC + 1) |
| ' |
| |
| PARSE_AND_LIST_LONGOPTS=' |
| { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE }, |
| { "emit-stub-syms", no_argument, NULL, OPTION_STUBSYMS }, |
| { "dotsyms", no_argument, NULL, OPTION_DOTSYMS }, |
| { "no-dotsyms", no_argument, NULL, OPTION_NO_DOTSYMS }, |
| { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT }, |
| { "no-opd-optimize", no_argument, NULL, OPTION_NO_OPD_OPT }, |
| { "no-toc-optimize", no_argument, NULL, OPTION_NO_TOC_OPT }, |
| { "no-multi-toc", no_argument, NULL, OPTION_NO_MULTI_TOC }, |
| { "non-overlapping-opd", no_argument, NULL, OPTION_NON_OVERLAPPING_OPD }, |
| ' |
| |
| PARSE_AND_LIST_OPTIONS=' |
| fprintf (file, _("\ |
| --stub-group-size=N Maximum size of a group of input sections that can be\n\ |
| handled by one stub section. A negative value\n\ |
| locates all stubs before their branches (with a\n\ |
| group size of -N), while a positive value allows\n\ |
| two groups of input sections, one before, and one\n\ |
| after each stub section. Values of +/-1 indicate\n\ |
| the linker should choose suitable defaults.\n" |
| )); |
| fprintf (file, _("\ |
| --emit-stub-syms Label linker stubs with a symbol.\n" |
| )); |
| fprintf (file, _("\ |
| --dotsyms For every version pattern \"foo\" in a version script,\n\ |
| add \".foo\" so that function code symbols are\n\ |
| treated the same as function descriptor symbols.\n\ |
| Defaults to on.\n" |
| )); |
| fprintf (file, _("\ |
| --no-dotsyms Don'\''t do anything special in version scripts.\n" |
| )); |
| fprintf (file, _("\ |
| --no-tls-optimize Don'\''t try to optimize TLS accesses.\n" |
| )); |
| fprintf (file, _("\ |
| --no-opd-optimize Don'\''t optimize the OPD section.\n" |
| )); |
| fprintf (file, _("\ |
| --no-toc-optimize Don'\''t optimize the TOC section.\n" |
| )); |
| fprintf (file, _("\ |
| --no-multi-toc Disallow automatic multiple toc sections.\n" |
| )); |
| fprintf (file, _("\ |
| --non-overlapping-opd Canonicalize .opd, so that there are no overlapping\n\ |
| .opd entries.\n" |
| )); |
| ' |
| |
| PARSE_AND_LIST_ARGS_CASES=' |
| case OPTION_STUBGROUP_SIZE: |
| { |
| const char *end; |
| group_size = bfd_scan_vma (optarg, &end, 0); |
| if (*end) |
| einfo (_("%P%F: invalid number `%s'\''\n"), optarg); |
| } |
| break; |
| |
| case OPTION_STUBSYMS: |
| emit_stub_syms = 1; |
| break; |
| |
| case OPTION_DOTSYMS: |
| dotsyms = 1; |
| break; |
| |
| case OPTION_NO_DOTSYMS: |
| dotsyms = 0; |
| break; |
| |
| case OPTION_NO_TLS_OPT: |
| no_tls_opt = 1; |
| break; |
| |
| case OPTION_NO_OPD_OPT: |
| no_opd_opt = 1; |
| break; |
| |
| case OPTION_NO_TOC_OPT: |
| no_toc_opt = 1; |
| break; |
| |
| case OPTION_NO_MULTI_TOC: |
| no_multi_toc = 1; |
| break; |
| |
| case OPTION_NON_OVERLAPPING_OPD: |
| non_overlapping_opd = 1; |
| break; |
| ' |
| |
| # Put these extra ppc64elf routines in ld_${EMULATION_NAME}_emulation |
| # |
| LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation |
| LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation |
| LDEMUL_FINISH=ppc_finish |
| LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_create_output_section_statements |
| LDEMUL_NEW_VERS_PATTERN=gld${EMULATION_NAME}_new_vers_pattern |