X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=ld%2Femultempl%2Fppc64elf.em;h=094a4fb55ed4363d365b6c8b677600903962a901;hb=3f764659c7b9bc8eb30920d37a55d3371d649d8a;hp=655ddea021edad745221fb21e20cda790e16e5b9;hpb=1f808cd5d7423d498fa6197317af6a919f8c9e95;p=deliverable%2Fbinutils-gdb.git diff --git a/ld/emultempl/ppc64elf.em b/ld/emultempl/ppc64elf.em index 655ddea021..094a4fb55e 100644 --- a/ld/emultempl/ppc64elf.em +++ b/ld/emultempl/ppc64elf.em @@ -1,5 +1,5 @@ # This shell script emits a C file. -*- C -*- -# Copyright 2002 Free Software Foundation, Inc. +# Copyright 2002, 2003, 2004 Free Software Foundation, Inc. # # This file is part of GLD, the Gnu Linker. # @@ -23,77 +23,527 @@ # cat >>e${EMULATION_NAME}.c <creator != &bfd_elf64_powerpc_vec + && link_info.hash->creator != &bfd_elf64_powerpcle_vec) + return; + + link_info.wrap_char = '.'; + + stub_file = lang_add_input_file ("linker stubs", + lang_input_file_is_fake_enum, + NULL); + stub_file->the_bfd = bfd_create ("linker stubs", output_bfd); + if (stub_file->the_bfd == NULL + || !bfd_set_arch_mach (stub_file->the_bfd, + bfd_get_arch (output_bfd), + bfd_get_mach (output_bfd))) + { + einfo ("%X%P: can not create BFD %E\n"); + return; + } + + ldlang_add_file (stub_file); + ppc64_elf_init_stub_bfd (stub_file->the_bfd, &link_info); +} + +static void +ppc_before_allocation (void) +{ + if (stub_file != NULL) + { + if (!ppc64_elf_edit_opd (output_bfd, &link_info, non_overlapping_opd)) + { + einfo ("%X%P: can not edit opd %E\n"); + return; + } + + if (ppc64_elf_tls_setup (output_bfd, &link_info) && !notlsopt) + { + /* Size the sections. This is premature, but we want to know the + TLS segment layout so that certain optimizations can be done. */ + lang_size_sections (stat_ptr->head, abs_output_section, + &stat_ptr->head, 0, 0, NULL, TRUE); + + if (!ppc64_elf_tls_optimize (output_bfd, &link_info)) + { + einfo ("%X%P: TLS problem %E\n"); + return; + } + + /* We must not cache anything from the preliminary sizing. */ + elf_tdata (output_bfd)->program_header_size = 0; + lang_reset_memory_regions (); + } + } + + gld${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; + + lang_reset_memory_regions (); + + /* Resize the sections. */ + lang_size_sections (stat_ptr->head, abs_output_section, + &stat_ptr->head, 0, 0, NULL, TRUE); + + /* Recalculate TOC base. */ + ldemul_after_allocation (); + + /* Do the assignments again. */ + lang_do_assignments (stat_ptr->head, abs_output_section, NULL, 0); +} + /* Call the back-end function to set TOC base after we have placed all the sections. */ static void -gld${EMULATION_NAME}_after_allocation () +gld${EMULATION_NAME}_after_allocation (void) { - if (!ppc64_elf_set_toc (output_bfd, &link_info)) - einfo ("%X%P: can not set TOC base: %E\n"); + if (!link_info.relocatable) + _bfd_set_gp_value (output_bfd, ppc64_elf_toc (output_bfd)); } -/* Final emulation specific call. PowerPC64 has 24 byte .plt entries, - and needs different call stubs for any entries that cross a 64k - boundary relative to the TOC. That means we need to wait until all - sections have been laid out to initialise the stubs. */ static void -gld${EMULATION_NAME}_finish () +build_toc_list (lang_statement_union_type *statement) { - /* If generating a relocatable output file, then we don't have any - stubs. */ - if (link_info.relocateable) - return; + if (statement->header.type == lang_input_section_enum + && !statement->input_section.ifile->just_syms_flag + && (statement->input_section.section->flags & SEC_EXCLUDE) == 0 + && statement->input_section.section->output_section == toc_section) + ppc64_elf_next_toc_section (&link_info, statement->input_section.section); +} + + +static void +build_section_lists (lang_statement_union_type *statement) +{ + if (statement->header.type == lang_input_section_enum + && !statement->input_section.ifile->just_syms_flag + && (statement->input_section.section->flags & SEC_EXCLUDE) == 0 + && statement->input_section.section->output_section != NULL + && statement->input_section.section->output_section->owner == output_bfd) + { + if (!ppc64_elf_next_input_section (&link_info, + statement->input_section.section)) + einfo ("%X%P: can not size stub section: %E\n"); + } +} + - /* bfd_elf64_discard_info just plays with debugging sections, +/* Final emulation specific call. */ + +static void +gld${EMULATION_NAME}_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 - adjusting stub sizes. */ - if (bfd_elf${ELFSIZE}_discard_info (output_bfd, &link_info)) + adding stubs. */ + if (bfd_elf_discard_info (output_bfd, &link_info)) need_laying_out = 1; - while (1) + /* If generating a relocatable output file, then we don't have any + stubs. */ + if (stub_file != NULL && !link_info.relocatable) { - /* Call into the BFD backend to do the real work. */ - if (! ppc64_elf_size_stubs (output_bfd, &link_info, &need_laying_out)) + int ret = ppc64_elf_setup_section_lists (output_bfd, &link_info); + if (ret != 0) { - einfo ("%X%P: can not size stub section: %E\n"); - return; + if (ret < 0) + { + einfo ("%X%P: can not size stub section: %E\n"); + return; + } + + 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"); + return; + } + } + } + + 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; + + 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); +} + - if (!need_laying_out) - break; +/* Add a pattern matching ".foo" for every "foo" in a version script. - /* If we have changed the size of the stub section, then we need - to recalculate all the section offsets. After this, we may - need to adjust the stub size again. */ - need_laying_out = 0; + 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. - /* Resize the sections. */ - lang_size_sections (stat_ptr->head, abs_output_section, - &stat_ptr->head, 0, (bfd_vma) 0, NULL); + . VERS_1 { + . global: + . this; that; some; thing; + . local: + . *; + . }; - /* Recalculate TOC base. */ - ldemul_after_allocation (); + 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. */ - /* Do the assignments again. */ - lang_do_assignments (stat_ptr->head, abs_output_section, - (fill_type) 0, (bfd_vma) 0); +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 *); - if (! ppc64_elf_build_stubs (output_bfd, &link_info)) - einfo ("%X%P: can not build stubs: %E\n"); +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_NON_OVERLAPPING_OPD (OPTION_NO_TLS_OPT + 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 }, + { "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, _("\ + --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: + notlsopt = 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=gld${EMULATION_NAME}_finish +LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_create_output_section_statements +LDEMUL_NEW_VERS_PATTERN=gld${EMULATION_NAME}_new_vers_pattern