X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=ld%2Fldlang.c;h=294e6323012cc60323932e5a43c8864f72de0532;hb=8be965c5f058f79554ec3376afac994e6e3ad1b7;hp=add86dadbd736eb4b244027f3796c76225a81b2a;hpb=c72f2fb2bb6a3e1850b081dbfce4040970fae8e6;p=deliverable%2Fbinutils-gdb.git diff --git a/ld/ldlang.c b/ld/ldlang.c index add86dadbd..294e632301 100644 --- a/ld/ldlang.c +++ b/ld/ldlang.c @@ -1,5 +1,5 @@ /* Linker command language support. - Copyright (C) 1991-2014 Free Software Foundation, Inc. + Copyright (C) 1991-2018 Free Software Foundation, Inc. This file is part of the GNU Binutils. @@ -39,7 +39,7 @@ #include "fnmatch.h" #include "demangle.h" #include "hashtab.h" -#include "libbfd.h" +#include "elf-bfd.h" #ifdef ENABLE_PLUGINS #include "plugin.h" #endif /* ENABLE_PLUGINS */ @@ -48,32 +48,35 @@ #define offsetof(TYPE, MEMBER) ((size_t) & (((TYPE*) 0)->MEMBER)) #endif -/* Locals variables. */ +/* Convert between addresses in bytes and sizes in octets. + For currently supported targets, octets_per_byte is always a power + of two, so we can use shifts. */ +#define TO_ADDR(X) ((X) >> opb_shift) +#define TO_SIZE(X) ((X) << opb_shift) + +/* Local variables. */ static struct obstack stat_obstack; static struct obstack map_obstack; #define obstack_chunk_alloc xmalloc #define obstack_chunk_free free static const char *entry_symbol_default = "start"; -static bfd_boolean placed_commons = FALSE; -static bfd_boolean stripped_excluded_sections = FALSE; +static bfd_boolean map_head_is_link_order = FALSE; static lang_output_section_statement_type *default_common_section; static bfd_boolean map_option_f; static bfd_vma print_dot; static lang_input_statement_type *first_file; static const char *current_target; static lang_statement_list_type statement_list; -static struct bfd_hash_table lang_definedness_table; static lang_statement_list_type *stat_save[10]; static lang_statement_list_type **stat_save_ptr = &stat_save[0]; static struct unique_sections *unique_section_list; static struct asneeded_minfo *asneeded_list_head; +static unsigned int opb_shift = 0; /* Forward declarations. */ static void exp_init_os (etree_type *); static lang_input_statement_type *lookup_name (const char *); -static struct bfd_hash_entry *lang_definedness_newfunc - (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); static void insert_undefined (const char *); static bfd_boolean sort_def_symbol (struct bfd_link_hash_entry *, void *); static void print_statement (lang_statement_union_type *, @@ -87,6 +90,7 @@ static void lang_record_phdrs (void); static void lang_do_version_exports_section (void); static void lang_finalize_version_expr_head (struct bfd_elf_version_expr_head *); +static void lang_do_memory_regions (void); /* Exported variables. */ const char *output_target; @@ -202,7 +206,7 @@ unique_section_p (const asection *sec, struct unique_sections *unam; const char *secnam; - if (link_info.relocatable + if (!link_info.resolve_section_groups && sec->owner != NULL && bfd_is_group_section (sec->owner, sec)) return !(os != NULL @@ -218,23 +222,16 @@ unique_section_p (const asection *sec, /* Generic traversal routines for finding matching sections. */ -/* Try processing a section against a wildcard. This just calls - the callback unless the filename exclusion list is present - and excludes the file. It's hardly ever present so this - function is very fast. */ +/* Return true if FILE matches a pattern in EXCLUDE_LIST, otherwise return + false. */ -static void -walk_wild_consider_section (lang_wild_statement_type *ptr, - lang_input_statement_type *file, - asection *s, - struct wildcard_list *sec, - callback_t callback, - void *data) +static bfd_boolean +walk_wild_file_in_exclude_list (struct name_list *exclude_list, + lang_input_statement_type *file) { struct name_list *list_tmp; - /* Don't process sections from files which were excluded. */ - for (list_tmp = sec->spec.exclude_name_list; + for (list_tmp = exclude_list; list_tmp; list_tmp = list_tmp->next) { @@ -243,11 +240,11 @@ walk_wild_consider_section (lang_wild_statement_type *ptr, if (p != NULL) { if (input_statement_is_archive_path (list_tmp->name, p, file)) - return; + return TRUE; } else if (name_match (list_tmp->name, file->filename) == 0) - return; + return TRUE; /* FIXME: Perhaps remove the following at some stage? Matching unadorned archives like this was never documented and has @@ -256,9 +253,29 @@ walk_wild_consider_section (lang_wild_statement_type *ptr, && file->the_bfd->my_archive != NULL && name_match (list_tmp->name, file->the_bfd->my_archive->filename) == 0) - return; + return TRUE; } + return FALSE; +} + +/* Try processing a section against a wildcard. This just calls + the callback unless the filename exclusion list is present + and excludes the file. It's hardly ever present so this + function is very fast. */ + +static void +walk_wild_consider_section (lang_wild_statement_type *ptr, + lang_input_statement_type *file, + asection *s, + struct wildcard_list *sec, + callback_t callback, + void *data) +{ + /* Don't process sections from files which were excluded. */ + if (walk_wild_file_in_exclude_list (sec->spec.exclude_name_list, file)) + return; + (*callback) (ptr, sec, s, ptr->section_flag_list, file, data); } @@ -855,8 +872,11 @@ walk_wild_file (lang_wild_statement_type *s, callback_t callback, void *data) { + if (walk_wild_file_in_exclude_list (s->exclude_name_list, f)) + return; + if (f->the_bfd == NULL - || ! bfd_check_format (f->the_bfd, bfd_archive)) + || !bfd_check_format (f->the_bfd, bfd_archive)) walk_wild_section (s, f, callback, data); else { @@ -1075,12 +1095,12 @@ new_afile (const char *name, break; case lang_input_file_is_l_enum: if (name[0] == ':' && name[1] != '\0') - { - p->filename = name + 1; - p->flags.full_name_provided = TRUE; - } + { + p->filename = name + 1; + p->flags.full_name_provided = TRUE; + } else - p->filename = name; + p->filename = name; p->local_sym_name = concat ("-l", name, (const char *) NULL); p->flags.maybe_archive = TRUE; p->flags.real = TRUE; @@ -1117,6 +1137,29 @@ lang_add_input_file (const char *name, lang_input_file_enum_type file_type, const char *target) { + if (name != NULL + && (*name == '=' || CONST_STRNEQ (name, "$SYSROOT"))) + { + lang_input_statement_type *ret; + char *sysrooted_name + = concat (ld_sysroot, + name + (*name == '=' ? 1 : strlen ("$SYSROOT")), + (const char *) NULL); + + /* We've now forcibly prepended the sysroot, making the input + file independent of the context. Therefore, temporarily + force a non-sysrooted context for this statement, so it won't + get the sysroot prepended again when opened. (N.B. if it's a + script, any child nodes with input files starting with "/" + will be handled as "sysrooted" as they'll be found to be + within the sysroot subdirectory.) */ + unsigned int outer_sysrooted = input_flags.sysrooted; + input_flags.sysrooted = 0; + ret = new_afile (sysrooted_name, file_type, target, TRUE); + input_flags.sysrooted = outer_sysrooted; + return ret; + } + return new_afile (name, file_type, target, TRUE); } @@ -1220,14 +1263,6 @@ lang_init (void) abs_output_section->bfd_section = bfd_abs_section_ptr; - /* The value "13" is ad-hoc, somewhat related to the expected number of - assignments in a linker script. */ - if (!bfd_hash_table_init_n (&lang_definedness_table, - lang_definedness_newfunc, - sizeof (struct lang_definedness_hash_entry), - 13)) - einfo (_("%P%F: can not create hash table: %E\n")); - asneeded_list_head = NULL; asneeded_list_tail = &asneeded_list_head; } @@ -1235,7 +1270,6 @@ lang_init (void) void lang_finish (void) { - bfd_hash_table_free (&lang_definedness_table); output_section_statement_table_free (); } @@ -1296,7 +1330,9 @@ lang_memory_region_lookup (const char *const name, bfd_boolean create) new_region->name_list.name = xstrdup (name); new_region->name_list.next = NULL; new_region->next = NULL; + new_region->origin_exp = NULL; new_region->origin = 0; + new_region->length_exp = NULL; new_region->length = ~(bfd_size_type) 0; new_region->current = 0; new_region->last_os = NULL; @@ -1311,11 +1347,11 @@ lang_memory_region_lookup (const char *const name, bfd_boolean create) } void -lang_memory_region_alias (const char * alias, const char * region_name) +lang_memory_region_alias (const char *alias, const char *region_name) { - lang_memory_region_name * n; - lang_memory_region_type * r; - lang_memory_region_type * region; + lang_memory_region_name *n; + lang_memory_region_type *r; + lang_memory_region_type *region; /* The default region must be unique. This ensures that it is not necessary to iterate through the name list if someone wants the check if a region is @@ -1352,7 +1388,7 @@ lang_memory_region_alias (const char * alias, const char * region_name) } static lang_memory_region_type * -lang_memory_default (asection * section) +lang_memory_default (asection *section) { lang_memory_region_type *p; @@ -1487,11 +1523,12 @@ next_matching_output_section_statement (lang_output_section_statement_type *os, lang_output_section_statement_type * lang_output_section_find_by_flags (const asection *sec, + flagword sec_flags, lang_output_section_statement_type **exact, lang_match_sec_type_func match_type) { lang_output_section_statement_type *first, *look, *found; - flagword look_flags, sec_flags, differ; + flagword look_flags, differ; /* We know the first statement on this list is *ABS*. May as well skip it. */ @@ -1499,7 +1536,6 @@ lang_output_section_find_by_flags (const asection *sec, first = first->next; /* First try for an exact match. */ - sec_flags = sec->flags; found = NULL; for (look = first; look; look = look->next) { @@ -1683,7 +1719,7 @@ lang_output_section_find_by_flags (const asection *sec, if (found || !match_type) return found; - return lang_output_section_find_by_flags (sec, NULL, NULL); + return lang_output_section_find_by_flags (sec, sec_flags, NULL, NULL); } /* Find the last output section before given output statement. @@ -1792,7 +1828,6 @@ lang_insert_orphan (asection *s, lang_statement_list_type *add_child) { lang_statement_list_type add; - const char *ps; lang_output_section_statement_type *os; lang_output_section_statement_type **os_tail; @@ -1805,7 +1840,8 @@ lang_insert_orphan (asection *s, push_stat_ptr (&add); } - if (link_info.relocatable || (s->flags & (SEC_LOAD | SEC_ALLOC)) == 0) + if (bfd_link_relocatable (&link_info) + || (s->flags & (SEC_LOAD | SEC_ALLOC)) == 0) address = exp_intop (0); os_tail = ((lang_output_section_statement_type **) @@ -1813,27 +1849,6 @@ lang_insert_orphan (asection *s, os = lang_enter_output_section_statement (secname, address, normal_section, NULL, NULL, NULL, constraint, 0); - ps = NULL; - if (config.build_constructors && *os_tail == os) - { - /* If the name of the section is representable in C, then create - symbols to mark the start and the end of the section. */ - for (ps = secname; *ps != '\0'; ps++) - if (! ISALNUM ((unsigned char) *ps) && *ps != '_') - break; - if (*ps == '\0') - { - char *symname; - - symname = (char *) xmalloc (ps - secname + sizeof "__start_" + 1); - symname[0] = bfd_get_symbol_leading_char (link_info.output_bfd); - sprintf (symname + (symname[0] != 0), "__start_%s", secname); - lang_add_assignment (exp_provide (symname, - exp_nameop (NAME, "."), - FALSE)); - } - } - if (add_child == NULL) add_child = &os->children; lang_add_section (add_child, s, NULL, os); @@ -1853,18 +1868,6 @@ lang_insert_orphan (asection *s, lang_leave_output_section_statement (NULL, DEFAULT_MEMORY_REGION, NULL, NULL); - if (ps != NULL && *ps == '\0') - { - char *symname; - - symname = (char *) xmalloc (ps - secname + sizeof "__stop_" + 1); - symname[0] = bfd_get_symbol_leading_char (link_info.output_bfd); - sprintf (symname + (symname[0] != 0), "__stop_%s", secname); - lang_add_assignment (exp_provide (symname, - exp_nameop (NAME, "."), - FALSE)); - } - /* Restore the global list pointer. */ if (after != NULL) pop_stat_ptr (); @@ -1988,14 +1991,11 @@ static void lang_print_asneeded (void) { struct asneeded_minfo *m; - char buf[100]; if (asneeded_list_head == NULL) return; - sprintf (buf, _("\nAs-needed library included " - "to satisfy reference by file (symbol)\n\n")); - minfo ("%s", buf); + minfo (_("\nAs-needed library included to satisfy reference by file (symbol)\n\n")); for (m = asneeded_list_head; m != NULL; m = m->next) { @@ -2059,7 +2059,7 @@ lang_map (void) || s->output_section->owner != link_info.output_bfd) && (s->flags & (SEC_LINKER_CREATED | SEC_KEEP)) == 0) { - if (! dis_header_printed) + if (!dis_header_printed) { fprintf (config.map_file, _("\nDiscarded input sections\n\n")); dis_header_printed = TRUE; @@ -2113,7 +2113,7 @@ lang_map (void) fprintf (config.map_file, _("\nLinker script and memory map\n\n")); - if (! link_info.reduce_memory_overheads) + if (!link_info.reduce_memory_overheads) { obstack_begin (&map_obstack, 1000); bfd_link_hash_traverse (link_info.hash, sort_def_symbol, 0); @@ -2121,7 +2121,8 @@ lang_map (void) lang_statement_iteration++; print_statements (); - ldemul_extra_map_file_text (link_info.output_bfd, &link_info, config.map_file); + ldemul_extra_map_file_text (link_info.output_bfd, &link_info, + config.map_file); } static bfd_boolean @@ -2172,7 +2173,8 @@ init_os (lang_output_section_statement_type *s, flagword flags) s->name, flags); if (s->bfd_section == NULL) { - einfo (_("%P%F: output format %s cannot represent section called %s\n"), + einfo (_("%P%F: output format %s cannot represent section" + " called %s: %E\n"), link_info.output_bfd->xvec->name, s->name); } s->bfd_section->output_section = s->bfd_section; @@ -2261,10 +2263,44 @@ section_already_linked (bfd *abfd, asection *sec, void *data) return; } + /* Deal with SHF_EXCLUDE ELF sections. */ + if (!bfd_link_relocatable (&link_info) + && (abfd->flags & BFD_PLUGIN) == 0 + && (sec->flags & (SEC_GROUP | SEC_KEEP | SEC_EXCLUDE)) == SEC_EXCLUDE) + sec->output_section = bfd_abs_section_ptr; + if (!(abfd->flags & DYNAMIC)) bfd_section_already_linked (abfd, sec, &link_info); } + +/* Returns true if SECTION is one we know will be discarded based on its + section flags, otherwise returns false. */ + +static bfd_boolean +lang_discard_section_p (asection *section) +{ + bfd_boolean discard; + flagword flags = section->flags; + + /* Discard sections marked with SEC_EXCLUDE. */ + discard = (flags & SEC_EXCLUDE) != 0; + + /* Discard the group descriptor sections when we're finally placing the + sections from within the group. */ + if ((flags & SEC_GROUP) != 0 + && link_info.resolve_section_groups) + discard = TRUE; + + /* Discard debugging sections if we are stripping debugging + information. */ + if ((link_info.strip == strip_debugger || link_info.strip == strip_all) + && (flags & SEC_DEBUGGING) != 0) + discard = TRUE; + + return discard; +} + /* The wild routines. These expand statements like *(.text) and foo.o to a list of @@ -2286,20 +2322,14 @@ lang_add_section (lang_statement_list_type *ptr, lang_input_section_type *new_section; bfd *abfd = link_info.output_bfd; - /* Discard sections marked with SEC_EXCLUDE. */ - discard = (flags & SEC_EXCLUDE) != 0; + /* Is this section one we know should be discarded? */ + discard = lang_discard_section_p (section); /* Discard input sections which are assigned to a section named DISCARD_SECTION_NAME. */ if (strcmp (output->name, DISCARD_SECTION_NAME) == 0) discard = TRUE; - /* Discard debugging sections if we are stripping debugging - information. */ - if ((link_info.strip == strip_debugger || link_info.strip == strip_all) - && (flags & SEC_DEBUGGING) != 0) - discard = TRUE; - if (discard) { if (section->output_section == NULL) @@ -2334,8 +2364,14 @@ lang_add_section (lang_statement_list_type *ptr, already been processed. One reason to do this is that on pe format targets, .text$foo sections go into .text and it's odd to see .text with SEC_LINK_ONCE set. */ - - if (!link_info.relocatable) + if ((flags & (SEC_LINK_ONCE | SEC_GROUP)) == (SEC_LINK_ONCE | SEC_GROUP)) + { + if (link_info.resolve_section_groups) + flags &= ~(SEC_LINK_ONCE | SEC_LINK_DUPLICATES | SEC_RELOC); + else + flags &= ~(SEC_LINK_DUPLICATES | SEC_RELOC); + } + else if (!bfd_link_relocatable (&link_info)) flags &= ~(SEC_LINK_ONCE | SEC_LINK_DUPLICATES | SEC_RELOC); switch (output->sectype) @@ -2410,8 +2446,7 @@ lang_add_section (lang_statement_list_type *ptr, section->output_section = output->bfd_section; - if (!link_info.relocatable - && !stripped_excluded_sections) + if (!map_head_is_link_order) { asection *s = output->bfd_section->map_tail.s; output->bfd_section->map_tail.s = section; @@ -2468,9 +2503,9 @@ wild_sort (lang_wild_statement_type *wild, archive. */ if (file->the_bfd != NULL - && bfd_my_archive (file->the_bfd) != NULL) + && file->the_bfd->my_archive != NULL) { - fn = bfd_get_filename (bfd_my_archive (file->the_bfd)); + fn = bfd_get_filename (file->the_bfd->my_archive); fa = TRUE; } else @@ -2479,9 +2514,9 @@ wild_sort (lang_wild_statement_type *wild, fa = FALSE; } - if (bfd_my_archive (ls->section->owner) != NULL) + if (ls->section->owner->my_archive != NULL) { - ln = bfd_get_filename (bfd_my_archive (ls->section->owner)); + ln = bfd_get_filename (ls->section->owner->my_archive); la = TRUE; } else @@ -2633,7 +2668,7 @@ lookup_name (const char *name) if (search->flags.loaded || !search->flags.real) return search; - if (! load_symbols (search, NULL)) + if (!load_symbols (search, NULL)) return NULL; return search; @@ -2717,8 +2752,8 @@ load_symbols (lang_input_statement_type *entry, if (entry->flags.missing_file) return TRUE; - if (! bfd_check_format (entry->the_bfd, bfd_archive) - && ! bfd_check_format_matches (entry->the_bfd, bfd_object, &matching)) + if (!bfd_check_format (entry->the_bfd, bfd_archive) + && !bfd_check_format_matches (entry->the_bfd, bfd_object, &matching)) { bfd_error_type err; struct lang_input_statement_flags save_flags; @@ -2790,9 +2825,7 @@ load_symbols (lang_input_statement_type *entry, break; case bfd_object: -#ifdef ENABLE_PLUGINS if (!entry->flags.reload) -#endif ldlang_add_file (entry); if (trace_files || verbose) info_msg ("%I\n", entry); @@ -2801,6 +2834,7 @@ load_symbols (lang_input_statement_type *entry, case bfd_archive: check_excluded_libs (entry->the_bfd); + entry->the_bfd->usrdata = entry; if (entry->flags.whole_archive) { bfd *member = NULL; @@ -2814,7 +2848,7 @@ load_symbols (lang_input_statement_type *entry, if (member == NULL) break; - if (! bfd_check_format (member, bfd_object)) + if (!bfd_check_format (member, bfd_object)) { einfo (_("%F%B: member %B in archive is not an object\n"), entry->the_bfd, member); @@ -3072,9 +3106,6 @@ lang_get_output_target (void) return default_target; } -/* Stashed function to free link_info.hash; see open_output. */ -void (*output_bfd_hash_table_free_fn) (struct bfd_link_hash_table *); - /* Open the output file. */ static void @@ -3086,15 +3117,15 @@ open_output (const char *name) line? */ if (command_line.endian != ENDIAN_UNSET) { - const bfd_target *target; - enum bfd_endian desired_endian; - /* Get the chosen target. */ - target = bfd_search_for_target (get_target, (void *) output_target); + const bfd_target *target + = bfd_iterate_over_targets (get_target, (void *) output_target); /* If the target is not supported, we cannot do anything. */ if (target != NULL) { + enum bfd_endian desired_endian; + if (command_line.endian == ENDIAN_BIG) desired_endian = BFD_ENDIAN_BIG; else @@ -3116,8 +3147,8 @@ open_output (const char *name) /* Try to find a target as similar as possible to the default target, but which has the desired endian characteristic. */ - bfd_search_for_target (closest_target_match, - (void *) target); + bfd_iterate_over_targets (closest_target_match, + (void *) target); /* Oh dear - we could not find any targets that satisfy our requirements. */ @@ -3143,9 +3174,9 @@ open_output (const char *name) delete_output_file_on_failure = TRUE; - if (! bfd_set_format (link_info.output_bfd, bfd_object)) + if (!bfd_set_format (link_info.output_bfd, bfd_object)) einfo (_("%P%F:%s: can not make object file: %E\n"), name); - if (! bfd_set_arch_mach (link_info.output_bfd, + if (!bfd_set_arch_mach (link_info.output_bfd, ldfile_output_architecture, ldfile_output_machine)) einfo (_("%P%F:%s: can not set architecture: %E\n"), name); @@ -3154,18 +3185,6 @@ open_output (const char *name) if (link_info.hash == NULL) einfo (_("%P%F: can not create hash table: %E\n")); - /* We want to please memory leak checkers by deleting link_info.hash. - We can't do it in lang_finish, as a bfd target may hold references to - symbols in this table and use them when their _bfd_write_contents - function is invoked, as part of bfd_close on the output_bfd. But, - output_bfd is deallocated at bfd_close, so we can't refer to - output_bfd after that time, and dereferencing it is needed to call - "bfd_link_hash_table_free". Smash this dependency deadlock and grab - the function pointer; arrange to call it on link_info.hash in - ld_cleanup. */ - output_bfd_hash_table_free_fn - = link_info.output_bfd->xvec->_bfd_link_hash_table_free; - bfd_set_gp_size (link_info.output_bfd, g_switch_value); } @@ -3178,7 +3197,8 @@ ldlang_open_output (lang_statement_union_type *statement) ASSERT (link_info.output_bfd == NULL); open_output (statement->output_statement.name); ldemul_set_output_arch (); - if (config.magic_demand_paged && !link_info.relocatable) + if (config.magic_demand_paged + && !bfd_link_relocatable (&link_info)) link_info.output_bfd->flags |= D_PAGED; else link_info.output_bfd->flags &= ~D_PAGED; @@ -3200,15 +3220,6 @@ ldlang_open_output (lang_statement_union_type *statement) } } -/* Convert between addresses in bytes and sizes in octets. - For currently supported targets, octets_per_byte is always a power - of two, so we can use shifts. */ -#define TO_ADDR(X) ((X) >> opb_shift) -#define TO_SIZE(X) ((X) << opb_shift) - -/* Support the above. */ -static unsigned int opb_shift = 0; - static void init_opb (void) { @@ -3283,43 +3294,38 @@ open_input_bfds (lang_statement_union_type *s, enum open_bfd_mode mode) { lang_statement_union_type **os_tail; lang_statement_list_type add; + bfd *abfd; s->input_statement.target = current_target; /* If we are being called from within a group, and this is an archive which has already been searched, then force it to be researched unless the whole archive - has been loaded already. Do the same for a rescan. */ + has been loaded already. Do the same for a rescan. + Likewise reload --as-needed shared libs. */ if (mode != OPEN_BFD_NORMAL #ifdef ENABLE_PLUGINS && ((mode & OPEN_BFD_RESCAN) == 0 || plugin_insert == NULL) #endif - && !s->input_statement.flags.whole_archive && s->input_statement.flags.loaded - && s->input_statement.the_bfd != NULL - && bfd_check_format (s->input_statement.the_bfd, - bfd_archive)) - s->input_statement.flags.loaded = FALSE; -#ifdef ENABLE_PLUGINS - /* When rescanning, reload --as-needed shared libs. */ - else if ((mode & OPEN_BFD_RESCAN) != 0 - && plugin_insert == NULL - && s->input_statement.flags.loaded - && s->input_statement.flags.add_DT_NEEDED_for_regular - && s->input_statement.the_bfd != NULL - && ((s->input_statement.the_bfd->flags) & DYNAMIC) != 0 - && plugin_should_reload (s->input_statement.the_bfd)) + && (abfd = s->input_statement.the_bfd) != NULL + && ((bfd_get_format (abfd) == bfd_archive + && !s->input_statement.flags.whole_archive) + || (bfd_get_format (abfd) == bfd_object + && ((abfd->flags) & DYNAMIC) != 0 + && s->input_statement.flags.add_DT_NEEDED_for_regular + && bfd_get_flavour (abfd) == bfd_target_elf_flavour + && (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0))) { s->input_statement.flags.loaded = FALSE; s->input_statement.flags.reload = TRUE; } -#endif os_tail = lang_output_section_statement.tail; lang_list_init (&add); - if (! load_symbols (&s->input_statement, &add)) + if (!load_symbols (&s->input_statement, &add)) config.make_executable = FALSE; if (add.head != NULL) @@ -3353,8 +3359,7 @@ open_input_bfds (lang_statement_union_type *s, enum open_bfd_mode mode) #endif break; case lang_assignment_statement_enum: - if (s->assignment_statement.exp->assign.defsym) - /* This is from a --defsym on the command line. */ + if (s->assignment_statement.exp->type.node_class != etree_assert) exp_fold_tree_no_dot (s->assignment_statement.exp); break; default: @@ -3367,65 +3372,6 @@ open_input_bfds (lang_statement_union_type *s, enum open_bfd_mode mode) einfo ("%F"); } -/* New-function for the definedness hash table. */ - -static struct bfd_hash_entry * -lang_definedness_newfunc (struct bfd_hash_entry *entry, - struct bfd_hash_table *table ATTRIBUTE_UNUSED, - const char *name ATTRIBUTE_UNUSED) -{ - struct lang_definedness_hash_entry *ret - = (struct lang_definedness_hash_entry *) entry; - - if (ret == NULL) - ret = (struct lang_definedness_hash_entry *) - bfd_hash_allocate (table, sizeof (struct lang_definedness_hash_entry)); - - if (ret == NULL) - einfo (_("%P%F: bfd_hash_allocate failed creating symbol %s\n"), name); - - ret->by_object = 0; - ret->by_script = 0; - ret->iteration = 0; - return &ret->root; -} - -/* Called during processing of linker script script expressions. - For symbols assigned in a linker script, return a struct describing - where the symbol is defined relative to the current expression, - otherwise return NULL. */ - -struct lang_definedness_hash_entry * -lang_symbol_defined (const char *name) -{ - return ((struct lang_definedness_hash_entry *) - bfd_hash_lookup (&lang_definedness_table, name, FALSE, FALSE)); -} - -/* Update the definedness state of NAME. */ - -void -lang_update_definedness (const char *name, struct bfd_link_hash_entry *h) -{ - struct lang_definedness_hash_entry *defentry - = (struct lang_definedness_hash_entry *) - bfd_hash_lookup (&lang_definedness_table, name, TRUE, FALSE); - - if (defentry == NULL) - einfo (_("%P%F: bfd_hash_lookup failed creating symbol %s\n"), name); - - /* If the symbol was already defined, and not by a script, then it - must be defined by an object file. */ - if (!defentry->by_script - && h->type != bfd_link_hash_undefined - && h->type != bfd_link_hash_common - && h->type != bfd_link_hash_new) - defentry->by_object = 1; - - defentry->by_script = 1; - defentry->iteration = lang_statement_iteration; -} - /* Add the supplied name to the symbol table as an undefined reference. This is a two step process as the symbol table doesn't even exist at the time the ld command line is processed. First we put the name @@ -3466,6 +3412,8 @@ insert_undefined (const char *name) { h->type = bfd_link_hash_undefined; h->u.undef.abfd = NULL; + if (is_elf_hash_table (link_info.hash)) + ((struct elf_link_hash_entry *) h)->mark = 1; bfd_link_add_undef (link_info.hash, h); } } @@ -3483,6 +3431,55 @@ lang_place_undefineds (void) insert_undefined (ptr->name); } +/* Structure used to build the list of symbols that the user has required + be defined. */ + +struct require_defined_symbol +{ + const char *name; + struct require_defined_symbol *next; +}; + +/* The list of symbols that the user has required be defined. */ + +static struct require_defined_symbol *require_defined_symbol_list; + +/* Add a new symbol NAME to the list of symbols that are required to be + defined. */ + +void +ldlang_add_require_defined (const char *const name) +{ + struct require_defined_symbol *ptr; + + ldlang_add_undef (name, TRUE); + ptr = (struct require_defined_symbol *) stat_alloc (sizeof (*ptr)); + ptr->next = require_defined_symbol_list; + ptr->name = strdup (name); + require_defined_symbol_list = ptr; +} + +/* Check that all symbols the user required to be defined, are defined, + raise an error if we find a symbol that is not defined. */ + +static void +ldlang_check_require_defined_symbols (void) +{ + struct require_defined_symbol *ptr; + + for (ptr = require_defined_symbol_list; ptr != NULL; ptr = ptr->next) + { + struct bfd_link_hash_entry *h; + + h = bfd_link_hash_lookup (link_info.hash, ptr->name, + FALSE, FALSE, TRUE); + if (h == NULL + || (h->type != bfd_link_hash_defined + && h->type != bfd_link_hash_defweak)) + einfo(_("%P%X: required symbol `%s' not defined\n"), ptr->name); + } +} + /* Check for all readonly or some readwrite sections. */ static void @@ -3497,19 +3494,19 @@ check_input_sections case lang_wild_statement_enum: walk_wild (&s->wild_statement, check_section_callback, output_section_statement); - if (! output_section_statement->all_input_readonly) + if (!output_section_statement->all_input_readonly) return; break; case lang_constructors_statement_enum: check_input_sections (constructor_list.head, output_section_statement); - if (! output_section_statement->all_input_readonly) + if (!output_section_statement->all_input_readonly) return; break; case lang_group_statement_enum: check_input_sections (s->group_statement.children.head, output_section_statement); - if (! output_section_statement->all_input_readonly) + if (!output_section_statement->all_input_readonly) return; break; default: @@ -3690,7 +3687,7 @@ map_input_to_output_sections processed the segment marker. Originally, the linker treated segment directives (like -Ttext on the command-line) as section directives. We honor the - section directive semantics for backwards compatibilty; + section directive semantics for backwards compatibility; linker scripts that do not specifically check for SEGMENT_START automatically get the old semantics. */ if (!s->address_statement.segment @@ -3891,7 +3888,7 @@ strip_excluded_output_sections (void) if (expld.phase != lang_mark_phase_enum) { expld.phase = lang_mark_phase_enum; - expld.dataseg.phase = exp_dataseg_none; + expld.dataseg.phase = exp_seg_none; one_lang_size_sections_pass (NULL, FALSE); lang_reset_memory_regions (); } @@ -3933,10 +3930,6 @@ strip_excluded_output_sections (void) } } - /* TODO: Don't just junk map_head.s, turn them into link_orders. */ - output_section->map_head.link_order = NULL; - output_section->map_tail.link_order = NULL; - if (exclude) { /* We don't set bfd_section to NULL since bfd_section of the @@ -3948,10 +3941,42 @@ strip_excluded_output_sections (void) link_info.output_bfd->section_count--; } } +} + +/* Called from ldwrite to clear out asection.map_head and + asection.map_tail for use as link_orders in ldwrite. + FIXME: Except for sh64elf.em which starts creating link_orders in + its after_allocation routine so needs to call it early. */ + +void +lang_clear_os_map (void) +{ + lang_output_section_statement_type *os; + + if (map_head_is_link_order) + return; + + for (os = &lang_output_section_statement.head->output_section_statement; + os != NULL; + os = os->next) + { + asection *output_section; + + if (os->constraint < 0) + continue; + + output_section = os->bfd_section; + if (output_section == NULL) + continue; + + /* TODO: Don't just junk map_head.s, turn them into link_orders. */ + output_section->map_head.link_order = NULL; + output_section->map_tail.link_order = NULL; + } /* Stop future calls to lang_add_section from messing with map_head and map_tail link_order fields. */ - stripped_excluded_sections = TRUE; + map_head_is_link_order = TRUE; } static void @@ -3981,7 +4006,7 @@ print_output_section_statement ++len; } - minfo ("0x%V %W", section->vma, section->size); + minfo ("0x%V %W", section->vma, TO_ADDR (section->size)); if (section->vma != section->lma) minfo (_(" load address 0x%V"), section->lma); @@ -4028,7 +4053,12 @@ print_assignment (lang_assignment_statement_type *assignment, osec = output_section->bfd_section; if (osec == NULL) osec = bfd_abs_section_ptr; - exp_fold_tree (tree, osec, &print_dot); + + if (assignment->exp->type.node_class != etree_provide) + exp_fold_tree (tree, osec, &print_dot); + else + expld.result.valid_p = FALSE; + if (expld.result.valid_p) { bfd_vma value; @@ -4066,7 +4096,10 @@ print_assignment (lang_assignment_statement_type *assignment, } else { - minfo ("*undef* "); + if (assignment->exp->type.node_class == etree_provide) + minfo ("[!provide]"); + else + minfo ("*undef* "); #ifdef BFD64 minfo (" "); #endif @@ -4144,7 +4177,8 @@ print_all_symbols (asection *sec) /* Sort the symbols by address. */ entries = (struct bfd_link_hash_entry **) - obstack_alloc (&map_obstack, ud->map_symbol_def_count * sizeof (*entries)); + obstack_alloc (&map_obstack, + ud->map_symbol_def_count * sizeof (*entries)); for (i = 0, def = ud->map_symbol_def_head; def; def = def->next, i++) entries[i] = def->entry; @@ -4195,7 +4229,7 @@ print_input_section (asection *i, bfd_boolean is_discarded) size = 0; } - minfo ("0x%V %W %B\n", addr, TO_ADDR (size), i->owner); + minfo ("0x%V %W %B\n", addr, size, i->owner); if (size != i->rawsize && i->rawsize != 0) { @@ -4283,7 +4317,9 @@ print_data_statement (lang_data_statement_type *data) break; } - minfo ("0x%V %W %s 0x%v", addr, size, name, data->value); + if (size < TO_SIZE ((unsigned) 1)) + size = TO_SIZE ((unsigned) 1); + minfo ("0x%V %W %s 0x%v", addr, TO_ADDR (size), name, data->value); if (data->exp->type.node_class != etree_value) { @@ -4326,7 +4362,7 @@ print_reloc_statement (lang_reloc_statement_type *reloc) size = bfd_get_reloc_size (reloc->howto); - minfo ("0x%V %W RELOC %s ", addr, size, reloc->howto->name); + minfo ("0x%V %W RELOC %s ", addr, TO_ADDR (size), reloc->howto->name); if (reloc->name != NULL) minfo ("%s+", reloc->name); @@ -4359,7 +4395,7 @@ print_padding_statement (lang_padding_statement_type *s) addr = s->output_offset; if (s->output_section != NULL) addr += s->output_section->vma; - minfo ("0x%V %W ", addr, (bfd_vma) s->size); + minfo ("0x%V %W ", addr, TO_ADDR (s->size)); if (s->fill->size != 0) { @@ -4382,8 +4418,17 @@ print_wild_statement (lang_wild_statement_type *w, print_space (); + if (w->exclude_name_list) + { + name_list *tmp; + minfo ("EXCLUDE_FILE(%s", w->exclude_name_list->name); + for (tmp = w->exclude_name_list->next; tmp; tmp = tmp->next) + minfo (" %s", tmp->name); + minfo (") "); + } + if (w->filenames_sorted) - minfo ("SORT("); + minfo ("SORT_BY_NAME("); if (w->filename != NULL) minfo ("%s", w->filename); else @@ -4394,8 +4439,44 @@ print_wild_statement (lang_wild_statement_type *w, minfo ("("); for (sec = w->section_list; sec; sec = sec->next) { - if (sec->spec.sorted) - minfo ("SORT("); + int closing_paren = 0; + + switch (sec->spec.sorted) + { + case none: + break; + + case by_name: + minfo ("SORT_BY_NAME("); + closing_paren = 1; + break; + + case by_alignment: + minfo ("SORT_BY_ALIGNMENT("); + closing_paren = 1; + break; + + case by_name_alignment: + minfo ("SORT_BY_NAME(SORT_BY_ALIGNMENT("); + closing_paren = 2; + break; + + case by_alignment_name: + minfo ("SORT_BY_ALIGNMENT(SORT_BY_NAME("); + closing_paren = 2; + break; + + case by_none: + minfo ("SORT_NONE("); + closing_paren = 1; + break; + + case by_init_priority: + minfo ("SORT_BY_INIT_PRIORITY("); + closing_paren = 1; + break; + } + if (sec->spec.exclude_name_list != NULL) { name_list *tmp; @@ -4408,7 +4489,7 @@ print_wild_statement (lang_wild_statement_type *w, minfo ("%s", sec->spec.name); else minfo ("*"); - if (sec->spec.sorted) + for (;closing_paren > 0; closing_paren--) minfo (")"); if (sec->next) minfo (" "); @@ -4612,7 +4693,8 @@ size_input_section if (i->sec_info_type == SEC_INFO_TYPE_JUST_SYMS) i->output_offset = i->vma - o->vma; - else if ((i->flags & SEC_EXCLUDE) != 0) + else if (((i->flags & SEC_EXCLUDE) != 0) + || output_section_statement->ignored) i->output_offset = dot - o->vma; else { @@ -4648,17 +4730,39 @@ size_input_section return dot; } +struct check_sec +{ + asection *sec; + bfd_boolean warned; +}; + static int sort_sections_by_lma (const void *arg1, const void *arg2) { - const asection *sec1 = *(const asection **) arg1; - const asection *sec2 = *(const asection **) arg2; + const asection *sec1 = ((const struct check_sec *) arg1)->sec; + const asection *sec2 = ((const struct check_sec *) arg2)->sec; + + if (sec1->lma < sec2->lma) + return -1; + else if (sec1->lma > sec2->lma) + return 1; + else if (sec1->id < sec2->id) + return -1; + else if (sec1->id > sec2->id) + return 1; + + return 0; +} + +static int +sort_sections_by_vma (const void *arg1, const void *arg2) +{ + const asection *sec1 = ((const struct check_sec *) arg1)->sec; + const asection *sec2 = ((const struct check_sec *) arg2)->sec; - if (bfd_section_lma (sec1->owner, sec1) - < bfd_section_lma (sec2->owner, sec2)) + if (sec1->vma < sec2->vma) return -1; - else if (bfd_section_lma (sec1->owner, sec1) - > bfd_section_lma (sec2->owner, sec2)) + else if (sec1->vma > sec2->vma) return 1; else if (sec1->id < sec2->id) return -1; @@ -4668,10 +4772,11 @@ sort_sections_by_lma (const void *arg1, const void *arg2) return 0; } +#define IS_TBSS(s) \ + ((s->flags & (SEC_LOAD | SEC_THREAD_LOCAL)) == SEC_THREAD_LOCAL) + #define IGNORE_SECTION(s) \ - ((s->flags & SEC_ALLOC) == 0 \ - || ((s->flags & SEC_THREAD_LOCAL) != 0 \ - && (s->flags & SEC_LOAD) == 0)) + ((s->flags & SEC_ALLOC) == 0 || IS_TBSS (s)) /* Check to see if any allocated sections overlap with other allocated sections. This can happen if a linker script specifies the output @@ -4682,66 +4787,132 @@ static void lang_check_section_addresses (void) { asection *s, *p; - asection **sections, **spp; - unsigned int count; + struct check_sec *sections; + size_t i, count; + bfd_vma addr_mask; bfd_vma s_start; bfd_vma s_end; - bfd_vma p_start; - bfd_vma p_end; - bfd_size_type amt; + bfd_vma p_start = 0; + bfd_vma p_end = 0; lang_memory_region_type *m; + bfd_boolean overlays; + + /* Detect address space overflow on allocated sections. */ + addr_mask = ((bfd_vma) 1 << + (bfd_arch_bits_per_address (link_info.output_bfd) - 1)) - 1; + addr_mask = (addr_mask << 1) + 1; + for (s = link_info.output_bfd->sections; s != NULL; s = s->next) + if ((s->flags & SEC_ALLOC) != 0) + { + s_end = (s->vma + s->size) & addr_mask; + if (s_end != 0 && s_end < (s->vma & addr_mask)) + einfo (_("%X%P: section %s VMA wraps around address space\n"), + s->name); + else + { + s_end = (s->lma + s->size) & addr_mask; + if (s_end != 0 && s_end < (s->lma & addr_mask)) + einfo (_("%X%P: section %s LMA wraps around address space\n"), + s->name); + } + } if (bfd_count_sections (link_info.output_bfd) <= 1) return; - amt = bfd_count_sections (link_info.output_bfd) * sizeof (asection *); - sections = (asection **) xmalloc (amt); + count = bfd_count_sections (link_info.output_bfd); + sections = XNEWVEC (struct check_sec, count); /* Scan all sections in the output list. */ count = 0; for (s = link_info.output_bfd->sections; s != NULL; s = s->next) { - /* Only consider loadable sections with real contents. */ - if (!(s->flags & SEC_LOAD) - || !(s->flags & SEC_ALLOC) + if (IGNORE_SECTION (s) || s->size == 0) continue; - sections[count] = s; + sections[count].sec = s; + sections[count].warned = FALSE; count++; } if (count <= 1) - return; + { + free (sections); + return; + } - qsort (sections, (size_t) count, sizeof (asection *), - sort_sections_by_lma); + qsort (sections, count, sizeof (*sections), sort_sections_by_lma); - spp = sections; - s = *spp++; - s_start = s->lma; - s_end = s_start + TO_ADDR (s->size) - 1; - for (count--; count; count--) + /* First check section LMAs. There should be no overlap of LMAs on + loadable sections, even with overlays. */ + for (p = NULL, i = 0; i < count; i++) { - /* We must check the sections' LMA addresses not their VMA - addresses because overlay sections can have overlapping VMAs - but they must have distinct LMAs. */ - p = s; + s = sections[i].sec; + if ((s->flags & SEC_LOAD) != 0) + { + s_start = s->lma; + s_end = s_start + TO_ADDR (s->size) - 1; + + /* Look for an overlap. We have sorted sections by lma, so + we know that s_start >= p_start. Besides the obvious + case of overlap when the current section starts before + the previous one ends, we also must have overlap if the + previous section wraps around the address space. */ + if (p != NULL + && (s_start <= p_end + || p_end < p_start)) + { + einfo (_("%X%P: section %s LMA [%V,%V]" + " overlaps section %s LMA [%V,%V]\n"), + s->name, s_start, s_end, p->name, p_start, p_end); + sections[i].warned = TRUE; + } + p = s; + p_start = s_start; + p_end = s_end; + } + } + + /* If any non-zero size allocated section (excluding tbss) starts at + exactly the same VMA as another such section, then we have + overlays. Overlays generated by the OVERLAY keyword will have + this property. It is possible to intentionally generate overlays + that fail this test, but it would be unusual. */ + qsort (sections, count, sizeof (*sections), sort_sections_by_vma); + overlays = FALSE; + p_start = sections[0].sec->vma; + for (i = 1; i < count; i++) + { + s_start = sections[i].sec->vma; + if (p_start == s_start) + { + overlays = TRUE; + break; + } p_start = s_start; - p_end = s_end; - s = *spp++; - s_start = s->lma; - s_end = s_start + TO_ADDR (s->size) - 1; - - /* Look for an overlap. We have sorted sections by lma, so we - know that s_start >= p_start. Besides the obvious case of - overlap when the current section starts before the previous - one ends, we also must have overlap if the previous section - wraps around the address space. */ - if (s_start <= p_end - || p_end < p_start) - einfo (_("%X%P: section %s loaded at [%V,%V] overlaps section %s loaded at [%V,%V]\n"), - s->name, s_start, s_end, p->name, p_start, p_end); + } + + /* Now check section VMAs if no overlays were detected. */ + if (!overlays) + { + for (p = NULL, i = 0; i < count; i++) + { + s = sections[i].sec; + s_start = s->vma; + s_end = s_start + TO_ADDR (s->size) - 1; + + if (p != NULL + && !sections[i].warned + && (s_start <= p_end + || p_end < p_start)) + einfo (_("%X%P: section %s VMA [%V,%V]" + " overlaps section %s VMA [%V,%V]\n"), + s->name, s_start, s_end, p->name, p_start, p_end); + p = s; + p_start = s_start; + p_end = s_end; + } } free (sections); @@ -4756,9 +4927,13 @@ lang_check_section_addresses (void) a bfd_vma quantity in decimal. */ for (m = lang_memory_region_list; m; m = m->next) if (m->had_full_message) - einfo (_("%X%P: region `%s' overflowed by %ld bytes\n"), - m->name_list.name, (long)(m->current - (m->origin + m->length))); - + { + unsigned long over = m->current - (m->origin + m->length); + einfo (ngettext ("%X%P: region `%s' overflowed by %lu byte\n", + "%X%P: region `%s' overflowed by %lu bytes\n", + over), + m->name_list.name, over); + } } /* Make sure the new address is within the region. We explicitly permit the @@ -4798,6 +4973,30 @@ os_region_check (lang_output_section_statement_type *os, } } +static void +ldlang_check_relro_region (lang_statement_union_type *s, + seg_align_type *seg) +{ + if (seg->relro == exp_seg_relro_start) + { + if (!seg->relro_start_stat) + seg->relro_start_stat = s; + else + { + ASSERT (seg->relro_start_stat == s); + } + } + else if (seg->relro == exp_seg_relro_end) + { + if (!seg->relro_end_stat) + seg->relro_end_stat = s; + else + { + ASSERT (seg->relro_end_stat == s); + } + } +} + /* Set the sizes for all the output sections. */ static bfd_vma @@ -4831,7 +5030,7 @@ lang_size_sections_1 here, in lang_insert_orphan, or in the default linker scripts. This is covering for coff backend linker bugs. See PR6945. */ if (os->addr_tree == NULL - && link_info.relocatable + && bfd_link_relocatable (&link_info) && (bfd_get_flavour (link_info.output_bfd) == bfd_target_coff_flavour)) os->addr_tree = exp_intop (0); @@ -4910,7 +5109,7 @@ lang_size_sections_1 defined, issue an error message. */ if (!os->ignored && !IGNORE_SECTION (os->bfd_section) - && ! link_info.relocatable + && !bfd_link_relocatable (&link_info) && check_regions && strcmp (os->region->name_list.name, DEFAULT_MEMORY_REGION) == 0 @@ -4958,8 +5157,11 @@ lang_size_sections_1 && (config.warn_section_align || os->addr_tree != NULL) && expld.phase != lang_mark_phase_enum) - einfo (_("%P: warning: changing start of section" - " %s by %lu bytes\n"), + einfo (ngettext ("%P: warning: changing start of " + "section %s by %lu byte\n", + "%P: warning: changing start of " + "section %s by %lu bytes\n", + (unsigned long) dotdelta), os->name, (unsigned long) dotdelta); } @@ -5038,7 +5240,7 @@ lang_size_sections_1 create overlapping LMAs. */ if (dot < last->vma && os->bfd_section->size != 0 - && dot + os->bfd_section->size <= last->vma) + && dot + TO_ADDR (os->bfd_section->size) <= last->vma) { /* If dot moved backwards then leave lma equal to vma. This is the old default lma, which might @@ -5047,15 +5249,15 @@ lang_size_sections_1 so people can fix their linker scripts. */ if (last->vma != last->lma) - einfo (_("%P: warning: dot moved backwards before `%s'\n"), - os->name); + einfo (_("%P: warning: dot moved backwards " + "before `%s'\n"), os->name); } else { /* If this is an overlay, set the current lma to that at the end of the previous section. */ if (os->sectype == overlay_section) - lma = last->lma + last->size; + lma = last->lma + TO_ADDR (last->size); /* Otherwise, keep the same lma to vma relationship as the previous section. */ @@ -5069,9 +5271,6 @@ lang_size_sections_1 } os->processed_lma = TRUE; - if (bfd_is_abs_section (os->bfd_section) || os->ignored) - break; - /* Keep track of normal sections using the default lma region. We use this to set the lma for following sections. Overlays or other linker @@ -5079,10 +5278,14 @@ lang_size_sections_1 default lma == vma is incorrect. To avoid warnings about dot moving backwards when using -Ttext, don't start tracking sections until we find one - of non-zero size or with lma set differently to vma. */ - if (((os->bfd_section->flags & SEC_HAS_CONTENTS) != 0 - || (os->bfd_section->flags & SEC_THREAD_LOCAL) == 0) - && (os->bfd_section->flags & SEC_ALLOC) != 0 + of non-zero size or with lma set differently to vma. + Do this tracking before we short-cut the loop so that we + track changes for the case where the section size is zero, + but the lma is set differently to the vma. This is + important, if an orphan section is placed after an + otherwise empty output section that has an explicit lma + set, we want that lma reflected in the orphans lma. */ + if (!IGNORE_SECTION (os->bfd_section) && (os->bfd_section->size != 0 || (r->last_os == NULL && os->bfd_section->vma != os->bfd_section->lma) @@ -5090,13 +5293,15 @@ lang_size_sections_1 && dot >= (r->last_os->output_section_statement .bfd_section->vma))) && os->lma_region == NULL - && !link_info.relocatable) + && !bfd_link_relocatable (&link_info)) r->last_os = s; + if (bfd_is_abs_section (os->bfd_section) || os->ignored) + break; + /* .tbss sections effectively have zero size. */ - if ((os->bfd_section->flags & SEC_HAS_CONTENTS) != 0 - || (os->bfd_section->flags & SEC_THREAD_LOCAL) == 0 - || link_info.relocatable) + if (!IS_TBSS (os->bfd_section) + || bfd_link_relocatable (&link_info)) dotdelta = TO_ADDR (os->bfd_section->size); else dotdelta = 0; @@ -5218,7 +5423,7 @@ lang_size_sections_1 { bfd_boolean again; - if (! bfd_relax_section (i->owner, i, &link_info, &again)) + if (!bfd_relax_section (i->owner, i, &link_info, &again)) einfo (_("%P%F: can't relax section: %E\n")); if (again) *relax = TRUE; @@ -5243,31 +5448,15 @@ lang_size_sections_1 bfd_vma newdot = dot; etree_type *tree = s->assignment_statement.exp; - expld.dataseg.relro = exp_dataseg_relro_none; + expld.dataseg.relro = exp_seg_relro_none; exp_fold_tree (tree, output_section_statement->bfd_section, &newdot); - if (expld.dataseg.relro == exp_dataseg_relro_start) - { - if (!expld.dataseg.relro_start_stat) - expld.dataseg.relro_start_stat = s; - else - { - ASSERT (expld.dataseg.relro_start_stat == s); - } - } - else if (expld.dataseg.relro == exp_dataseg_relro_end) - { - if (!expld.dataseg.relro_end_stat) - expld.dataseg.relro_end_stat = s; - else - { - ASSERT (expld.dataseg.relro_end_stat == s); - } - } - expld.dataseg.relro = exp_dataseg_relro_none; + ldlang_check_relro_region (s, &expld.dataseg); + + expld.dataseg.relro = exp_seg_relro_none; /* This symbol may be relative to this section. */ if ((tree->type.node_class == etree_provided @@ -5356,14 +5545,14 @@ lang_size_sections_1 segments. We are allowed an opportunity to override this decision. */ bfd_boolean -ldlang_override_segment_assignment (struct bfd_link_info * info ATTRIBUTE_UNUSED, - bfd * abfd ATTRIBUTE_UNUSED, - asection * current_section, - asection * previous_section, +ldlang_override_segment_assignment (struct bfd_link_info *info ATTRIBUTE_UNUSED, + bfd *abfd ATTRIBUTE_UNUSED, + asection *current_section, + asection *previous_section, bfd_boolean new_segment) { - lang_output_section_statement_type * cur; - lang_output_section_statement_type * prev; + lang_output_section_statement_type *cur; + lang_output_section_statement_type *prev; /* The checks below are only necessary when the BFD library has decided that the two sections ought to be placed into the same segment. */ @@ -5406,90 +5595,136 @@ one_lang_size_sections_pass (bfd_boolean *relax, bfd_boolean check_regions) 0, 0, relax, check_regions); } +static bfd_boolean +lang_size_segment (seg_align_type *seg) +{ + /* If XXX_SEGMENT_ALIGN XXX_SEGMENT_END pair was seen, check whether + a page could be saved in the data segment. */ + bfd_vma first, last; + + first = -seg->base & (seg->pagesize - 1); + last = seg->end & (seg->pagesize - 1); + if (first && last + && ((seg->base & ~(seg->pagesize - 1)) + != (seg->end & ~(seg->pagesize - 1))) + && first + last <= seg->pagesize) + { + seg->phase = exp_seg_adjust; + return TRUE; + } + + seg->phase = exp_seg_done; + return FALSE; +} + +static bfd_vma +lang_size_relro_segment_1 (seg_align_type *seg) +{ + bfd_vma relro_end, desired_end; + asection *sec; + + /* Compute the expected PT_GNU_RELRO/PT_LOAD segment end. */ + relro_end = ((seg->relro_end + seg->pagesize - 1) + & ~(seg->pagesize - 1)); + + /* Adjust by the offset arg of XXX_SEGMENT_RELRO_END. */ + desired_end = relro_end - seg->relro_offset; + + /* For sections in the relro segment.. */ + for (sec = link_info.output_bfd->section_last; sec; sec = sec->prev) + if ((sec->flags & SEC_ALLOC) != 0 + && sec->vma >= seg->base + && sec->vma < seg->relro_end - seg->relro_offset) + { + /* Where do we want to put this section so that it ends as + desired? */ + bfd_vma start, end, bump; + + end = start = sec->vma; + if (!IS_TBSS (sec)) + end += TO_ADDR (sec->size); + bump = desired_end - end; + /* We'd like to increase START by BUMP, but we must heed + alignment so the increase might be less than optimum. */ + start += bump; + start &= ~(((bfd_vma) 1 << sec->alignment_power) - 1); + /* This is now the desired end for the previous section. */ + desired_end = start; + } + + seg->phase = exp_seg_relro_adjust; + ASSERT (desired_end >= seg->base); + seg->base = desired_end; + return relro_end; +} + +static bfd_boolean +lang_size_relro_segment (bfd_boolean *relax, bfd_boolean check_regions) +{ + bfd_boolean do_reset = FALSE; + bfd_boolean do_data_relro; + bfd_vma data_initial_base, data_relro_end; + + if (link_info.relro && expld.dataseg.relro_end) + { + do_data_relro = TRUE; + data_initial_base = expld.dataseg.base; + data_relro_end = lang_size_relro_segment_1 (&expld.dataseg); + } + else + { + do_data_relro = FALSE; + data_initial_base = data_relro_end = 0; + } + + if (do_data_relro) + { + lang_reset_memory_regions (); + one_lang_size_sections_pass (relax, check_regions); + + /* Assignments to dot, or to output section address in a user + script have increased padding over the original. Revert. */ + if (do_data_relro && expld.dataseg.relro_end > data_relro_end) + { + expld.dataseg.base = data_initial_base;; + do_reset = TRUE; + } + } + + if (!do_data_relro && lang_size_segment (&expld.dataseg)) + do_reset = TRUE; + + return do_reset; +} + void lang_size_sections (bfd_boolean *relax, bfd_boolean check_regions) { expld.phase = lang_allocating_phase_enum; - expld.dataseg.phase = exp_dataseg_none; + expld.dataseg.phase = exp_seg_none; one_lang_size_sections_pass (relax, check_regions); - if (expld.dataseg.phase == exp_dataseg_end_seen - && link_info.relro && expld.dataseg.relro_end) - { - /* If DATA_SEGMENT_ALIGN DATA_SEGMENT_RELRO_END pair was seen, try - to put expld.dataseg.relro_end on a (common) page boundary. */ - bfd_vma min_base, relro_end, maxpage; - - expld.dataseg.phase = exp_dataseg_relro_adjust; - maxpage = expld.dataseg.maxpagesize; - /* MIN_BASE is the absolute minimum address we are allowed to start the - read-write segment (byte before will be mapped read-only). */ - min_base = (expld.dataseg.min_base + maxpage - 1) & ~(maxpage - 1); - expld.dataseg.base += (-expld.dataseg.relro_end - & (expld.dataseg.pagesize - 1)); - /* Compute the expected PT_GNU_RELRO segment end. */ - relro_end = ((expld.dataseg.relro_end + expld.dataseg.pagesize - 1) - & ~(expld.dataseg.pagesize - 1)); - if (min_base + maxpage < expld.dataseg.base) - { - expld.dataseg.base -= maxpage; - relro_end -= maxpage; - } - lang_reset_memory_regions (); - one_lang_size_sections_pass (relax, check_regions); - if (expld.dataseg.relro_end > relro_end) - { - /* The alignment of sections between DATA_SEGMENT_ALIGN - and DATA_SEGMENT_RELRO_END can cause excessive padding to - be inserted at DATA_SEGMENT_RELRO_END. Try to start a - bit lower so that the section alignments will fit in. */ - asection *sec; - unsigned int max_alignment_power = 0; - /* Find maximum alignment power of sections between - DATA_SEGMENT_ALIGN and DATA_SEGMENT_RELRO_END. */ - for (sec = link_info.output_bfd->sections; sec; sec = sec->next) - if (sec->vma >= expld.dataseg.base - && sec->vma < expld.dataseg.relro_end - && sec->alignment_power > max_alignment_power) - max_alignment_power = sec->alignment_power; + if (expld.dataseg.phase != exp_seg_end_seen) + expld.dataseg.phase = exp_seg_done; - if (((bfd_vma) 1 << max_alignment_power) < expld.dataseg.pagesize) - { - /* Aligning the adjusted base guarantees the padding - between sections won't change. This is better than - simply subtracting 1 << max_alignment_power which is - what we used to do here. */ - expld.dataseg.base &= ~((1 << max_alignment_power) - 1); - lang_reset_memory_regions (); - one_lang_size_sections_pass (relax, check_regions); - } - } - link_info.relro_start = expld.dataseg.base; - link_info.relro_end = expld.dataseg.relro_end; - } - else if (expld.dataseg.phase == exp_dataseg_end_seen) + if (expld.dataseg.phase == exp_seg_end_seen) { - /* If DATA_SEGMENT_ALIGN DATA_SEGMENT_END pair was seen, check whether - a page could be saved in the data segment. */ - bfd_vma first, last; + bfd_boolean do_reset + = lang_size_relro_segment (relax, check_regions); - first = -expld.dataseg.base & (expld.dataseg.pagesize - 1); - last = expld.dataseg.end & (expld.dataseg.pagesize - 1); - if (first && last - && ((expld.dataseg.base & ~(expld.dataseg.pagesize - 1)) - != (expld.dataseg.end & ~(expld.dataseg.pagesize - 1))) - && first + last <= expld.dataseg.pagesize) + if (do_reset) { - expld.dataseg.phase = exp_dataseg_adjust; lang_reset_memory_regions (); one_lang_size_sections_pass (relax, check_regions); } - else - expld.dataseg.phase = exp_dataseg_done; + + if (link_info.relro && expld.dataseg.relro_end) + { + link_info.relro_start = expld.dataseg.base; + link_info.relro_end = expld.dataseg.relro_end; + } } - else - expld.dataseg.phase = exp_dataseg_done; } static lang_output_section_statement_type *current_section; @@ -5517,6 +5752,7 @@ lang_do_assignments_1 (lang_statement_union_type *s, case lang_output_section_statement_enum: { lang_output_section_statement_type *os; + bfd_vma newdot; os = &(s->output_section_statement); os->after_end = *found_end; @@ -5528,18 +5764,24 @@ lang_do_assignments_1 (lang_statement_union_type *s, prefer_next_section = FALSE; } dot = os->bfd_section->vma; - - lang_do_assignments_1 (os->children.head, - os, os->fill, dot, found_end); - - /* .tbss sections effectively have zero size. */ - if ((os->bfd_section->flags & SEC_HAS_CONTENTS) != 0 - || (os->bfd_section->flags & SEC_THREAD_LOCAL) == 0 - || link_info.relocatable) - dot += TO_ADDR (os->bfd_section->size); - - if (os->update_dot_tree != NULL) - exp_fold_tree (os->update_dot_tree, bfd_abs_section_ptr, &dot); + } + newdot = lang_do_assignments_1 (os->children.head, + os, os->fill, dot, found_end); + if (!os->ignored) + { + if (os->bfd_section != NULL) + { + /* .tbss sections effectively have zero size. */ + if (!IS_TBSS (os->bfd_section) + || bfd_link_relocatable (&link_info)) + dot += TO_ADDR (os->bfd_section->size); + + if (os->update_dot_tree != NULL) + exp_fold_tree (os->update_dot_tree, + bfd_abs_section_ptr, &dot); + } + else + dot = newdot; } } break; @@ -5563,7 +5805,7 @@ lang_do_assignments_1 (lang_statement_union_type *s, if (expld.result.section != NULL) s->data_statement.value += expld.result.section->vma; } - else + else if (expld.phase == lang_final_phase_enum) einfo (_("%F%P: invalid data statement\n")); { unsigned int size; @@ -5596,7 +5838,7 @@ lang_do_assignments_1 (lang_statement_union_type *s, bfd_abs_section_ptr, &dot); if (expld.result.valid_p) s->reloc_statement.addend_value = expld.result.value; - else + else if (expld.phase == lang_final_phase_enum) einfo (_("%F%P: invalid reloc statement\n")); dot += TO_ADDR (bfd_get_reloc_size (s->reloc_statement.howto)); break; @@ -5632,7 +5874,8 @@ lang_do_assignments_1 (lang_statement_union_type *s, *found_end = TRUE; } exp_fold_tree (s->assignment_statement.exp, - current_os->bfd_section, + (current_os->bfd_section != NULL + ? current_os->bfd_section : bfd_und_section_ptr), &dot); break; @@ -5747,67 +5990,188 @@ section_for_dot (void) return bfd_abs_section_ptr; } -/* Fix any .startof. or .sizeof. symbols. When the assemblers see the - operator .startof. (section_name), it produces an undefined symbol - .startof.section_name. Similarly, when it sees - .sizeof. (section_name), it produces an undefined symbol - .sizeof.section_name. For all the output sections, we look for - such symbols, and set them to the correct value. */ +/* Array of __start/__stop/.startof./.sizeof/ symbols. */ + +static struct bfd_link_hash_entry **start_stop_syms; +static size_t start_stop_count = 0; +static size_t start_stop_alloc = 0; + +/* Give start/stop SYMBOL for SEC a preliminary definition, and add it + to start_stop_syms. */ static void -lang_set_startof (void) +lang_define_start_stop (const char *symbol, asection *sec) { + struct bfd_link_hash_entry *h; + + h = bfd_define_start_stop (link_info.output_bfd, &link_info, symbol, sec); + if (h != NULL) + { + if (start_stop_count == start_stop_alloc) + { + start_stop_alloc = 2 * start_stop_alloc + 10; + start_stop_syms + = xrealloc (start_stop_syms, + start_stop_alloc * sizeof (*start_stop_syms)); + } + start_stop_syms[start_stop_count++] = h; + } +} + +/* Check for input sections whose names match references to + __start_SECNAME or __stop_SECNAME symbols. Give the symbols + preliminary definitions. */ + +static void +lang_init_start_stop (void) +{ + bfd *abfd; asection *s; + char leading_char = bfd_get_symbol_leading_char (link_info.output_bfd); + + for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next) + for (s = abfd->sections; s != NULL; s = s->next) + { + const char *ps; + const char *secname = s->name; + + for (ps = secname; *ps != '\0'; ps++) + if (!ISALNUM ((unsigned char) *ps) && *ps != '_') + break; + if (*ps == '\0') + { + char *symbol = (char *) xmalloc (10 + strlen (secname)); - if (link_info.relocatable) + symbol[0] = leading_char; + sprintf (symbol + (leading_char != 0), "__start_%s", secname); + lang_define_start_stop (symbol, s); + + symbol[1] = leading_char; + memcpy (symbol + 1 + (leading_char != 0), "__stop", 6); + lang_define_start_stop (symbol + 1, s); + + free (symbol); + } + } +} + +/* Iterate over start_stop_syms. */ + +static void +foreach_start_stop (void (*func) (struct bfd_link_hash_entry *)) +{ + size_t i; + + for (i = 0; i < start_stop_count; ++i) + func (start_stop_syms[i]); +} + +/* __start and __stop symbols are only supposed to be defined by the + linker for orphan sections, but we now extend that to sections that + map to an output section of the same name. The symbols were + defined early for --gc-sections, before we mapped input to output + sections, so undo those that don't satisfy this rule. */ + +static void +undef_start_stop (struct bfd_link_hash_entry *h) +{ + if (h->ldscript_def) return; + if (h->u.def.section->output_section == NULL + || h->u.def.section->output_section->owner != link_info.output_bfd + || strcmp (h->u.def.section->name, + h->u.def.section->output_section->name) != 0) + { + h->type = bfd_link_hash_undefined; + h->u.undef.abfd = NULL; + } +} + +static void +lang_undef_start_stop (void) +{ + foreach_start_stop (undef_start_stop); +} + +/* Check for output sections whose names match references to + .startof.SECNAME or .sizeof.SECNAME symbols. Give the symbols + preliminary definitions. */ + +static void +lang_init_startof_sizeof (void) +{ + asection *s; + for (s = link_info.output_bfd->sections; s != NULL; s = s->next) { - const char *secname; - char *buf; - struct bfd_link_hash_entry *h; + const char *secname = s->name; + char *symbol = (char *) xmalloc (10 + strlen (secname)); - secname = bfd_get_section_name (link_info.output_bfd, s); - buf = (char *) xmalloc (10 + strlen (secname)); + sprintf (symbol, ".startof.%s", secname); + lang_define_start_stop (symbol, s); - sprintf (buf, ".startof.%s", secname); - h = bfd_link_hash_lookup (link_info.hash, buf, FALSE, FALSE, TRUE); - if (h != NULL && h->type == bfd_link_hash_undefined) - { - h->type = bfd_link_hash_defined; - h->u.def.value = 0; - h->u.def.section = s; - } + memcpy (symbol + 1, ".size", 5); + lang_define_start_stop (symbol + 1, s); + free (symbol); + } +} + +/* Set .startof., .sizeof., __start and __stop symbols final values. */ + +static void +set_start_stop (struct bfd_link_hash_entry *h) +{ + if (h->ldscript_def + || h->type != bfd_link_hash_defined) + return; - sprintf (buf, ".sizeof.%s", secname); - h = bfd_link_hash_lookup (link_info.hash, buf, FALSE, FALSE, TRUE); - if (h != NULL && h->type == bfd_link_hash_undefined) + if (h->root.string[0] == '.') + { + /* .startof. or .sizeof. symbol. + .startof. already has final value. */ + if (h->root.string[2] == 'i') { - h->type = bfd_link_hash_defined; - h->u.def.value = TO_ADDR (s->size); + /* .sizeof. */ + h->u.def.value = TO_ADDR (h->u.def.section->size); h->u.def.section = bfd_abs_section_ptr; } + } + else + { + /* __start or __stop symbol. */ + int has_lead = bfd_get_symbol_leading_char (link_info.output_bfd) != 0; - free (buf); + h->u.def.section = h->u.def.section->output_section; + if (h->root.string[4 + has_lead] == 'o') + { + /* __stop_ */ + h->u.def.value = TO_ADDR (h->u.def.section->size); + } } } +static void +lang_finalize_start_stop (void) +{ + foreach_start_stop (set_start_stop); +} + static void lang_end (void) { struct bfd_link_hash_entry *h; bfd_boolean warn; - if ((link_info.relocatable && !link_info.gc_sections) - || (link_info.shared && !link_info.executable)) + if ((bfd_link_relocatable (&link_info) && !link_info.gc_sections) + || bfd_link_dll (&link_info)) warn = entry_from_cmdline; else warn = TRUE; /* Force the user to specify a root when generating a relocatable with --gc-sections. */ - if (link_info.gc_sections && link_info.relocatable + if (link_info.gc_sections && bfd_link_relocatable (&link_info) && !(entry_from_cmdline || undef_from_cmdline)) einfo (_("%P%F: gc-sections requires either an entry or " "an undefined symbol\n")); @@ -5833,7 +6197,7 @@ lang_end (void) + bfd_get_section_vma (link_info.output_bfd, h->u.def.section->output_section) + h->u.def.section->output_offset); - if (! bfd_set_start_address (link_info.output_bfd, val)) + if (!bfd_set_start_address (link_info.output_bfd, val)) einfo (_("%P%F:%s: can't set start address\n"), entry_symbol.name); } else @@ -5846,7 +6210,7 @@ lang_end (void) val = bfd_scan_vma (entry_symbol.name, &send, 0); if (*send == '\0') { - if (! bfd_set_start_address (link_info.output_bfd, val)) + if (!bfd_set_start_address (link_info.output_bfd, val)) einfo (_("%P%F: can't set start address\n")); } else @@ -5883,7 +6247,8 @@ lang_end (void) BFD. */ static void -ignore_bfd_errors (const char *s ATTRIBUTE_UNUSED, ...) +ignore_bfd_errors (const char *fmt ATTRIBUTE_UNUSED, + va_list ap ATTRIBUTE_UNUSED) { /* Don't do anything. */ } @@ -5917,7 +6282,8 @@ lang_check (void) input format may not have equivalent representations in the output format (and besides BFD does not translate relocs for other link purposes than a final link). */ - if ((link_info.relocatable || link_info.emitrelocations) + if ((bfd_link_relocatable (&link_info) + || link_info.emitrelocations) && (compatible == NULL || (bfd_get_flavour (input_bfd) != bfd_get_flavour (link_info.output_bfd))) @@ -5950,15 +6316,15 @@ lang_check (void) function which will do nothing. We still want to call bfd_merge_private_bfd_data, since it may set up information which is needed in the output file. */ - if (! command_line.warn_mismatch) + if (!command_line.warn_mismatch) pfn = bfd_set_error_handler (ignore_bfd_errors); - if (! bfd_merge_private_bfd_data (input_bfd, link_info.output_bfd)) + if (!bfd_merge_private_bfd_data (input_bfd, &link_info)) { if (command_line.warn_mismatch) einfo (_("%P%X: failed to merge target specific data" " of file %B\n"), input_bfd); } - if (! command_line.warn_mismatch) + if (!command_line.warn_mismatch) bfd_set_error_handler (pfn); } } @@ -5971,13 +6337,13 @@ lang_check (void) static void lang_common (void) { - if (command_line.inhibit_common_definition) + if (link_info.inhibit_common_definition) return; - if (link_info.relocatable - && ! command_line.force_common_definition) + if (bfd_link_relocatable (&link_info) + && !command_line.force_common_definition) return; - if (! config.sort_common) + if (!config.sort_common) bfd_link_hash_traverse (link_info.hash, lang_one_common, NULL); else { @@ -5996,7 +6362,7 @@ lang_common (void) for (power = 0; power <= 4; power++) bfd_link_hash_traverse (link_info.hash, lang_one_common, &power); - power = UINT_MAX; + power = (unsigned int) -1; bfd_link_hash_traverse (link_info.hash, lang_one_common, &power); } } @@ -6036,7 +6402,7 @@ lang_one_common (struct bfd_link_hash_entry *h, void *info) char *name; char buf[50]; - if (! header_printed) + if (!header_printed) { minfo (_("\nAllocating common symbols\n")); minfo (_("Common symbol size file\n\n")); @@ -6088,6 +6454,55 @@ lang_one_common (struct bfd_link_hash_entry *h, void *info) return TRUE; } +/* Handle a single orphan section S, placing the orphan into an appropriate + output section. The effects of the --orphan-handling command line + option are handled here. */ + +static void +ldlang_place_orphan (asection *s) +{ + if (config.orphan_handling == orphan_handling_discard) + { + lang_output_section_statement_type *os; + os = lang_output_section_statement_lookup (DISCARD_SECTION_NAME, 0, + TRUE); + if (os->addr_tree == NULL + && (bfd_link_relocatable (&link_info) + || (s->flags & (SEC_LOAD | SEC_ALLOC)) == 0)) + os->addr_tree = exp_intop (0); + lang_add_section (&os->children, s, NULL, os); + } + else + { + lang_output_section_statement_type *os; + const char *name = s->name; + int constraint = 0; + + if (config.orphan_handling == orphan_handling_error) + einfo (_("%X%P: error: unplaced orphan section `%A' from `%B'.\n"), + s, s->owner); + + if (config.unique_orphan_sections || unique_section_p (s, NULL)) + constraint = SPECIAL; + + os = ldemul_place_orphan (s, name, constraint); + if (os == NULL) + { + os = lang_output_section_statement_lookup (name, constraint, TRUE); + if (os->addr_tree == NULL + && (bfd_link_relocatable (&link_info) + || (s->flags & (SEC_LOAD | SEC_ALLOC)) == 0)) + os->addr_tree = exp_intop (0); + lang_add_section (&os->children, s, NULL, os); + } + + if (config.orphan_handling == orphan_handling_warn) + einfo (_("%P: warning: orphan section `%A' from `%B' being " + "placed in section `%s'.\n"), + s, s->owner, os->name); + } +} + /* Run through the input files and ensure that every input section has somewhere to go. If one is found without a destination then create an input request and place it into the statement tree. */ @@ -6108,14 +6523,14 @@ lang_place_orphans (void) if (file->flags.just_syms) bfd_link_just_syms (file->the_bfd, s, &link_info); - else if ((s->flags & SEC_EXCLUDE) != 0) + else if (lang_discard_section_p (s)) s->output_section = bfd_abs_section_ptr; else if (strcmp (s->name, "COMMON") == 0) { /* This is a lonely common section which must have come from an archive. We attach to the section with the wildcard. */ - if (! link_info.relocatable + if (!bfd_link_relocatable (&link_info) || command_line.force_common_definition) { if (default_common_section == NULL) @@ -6127,27 +6542,7 @@ lang_place_orphans (void) } } else - { - const char *name = s->name; - int constraint = 0; - - if (config.unique_orphan_sections - || unique_section_p (s, NULL)) - constraint = SPECIAL; - - if (!ldemul_place_orphan (s, name, constraint)) - { - lang_output_section_statement_type *os; - os = lang_output_section_statement_lookup (name, - constraint, - TRUE); - if (os->addr_tree == NULL - && (link_info.relocatable - || (s->flags & (SEC_LOAD | SEC_ALLOC)) == 0)) - os->addr_tree = exp_intop (0); - lang_add_section (&os->children, s, NULL, os); - } - } + ldlang_place_orphan (s); } } } @@ -6159,10 +6554,18 @@ lang_set_flags (lang_memory_region_type *ptr, const char *flags, int invert) flagword *ptr_flags; ptr_flags = invert ? &ptr->not_flags : &ptr->flags; + while (*flags) { switch (*flags) { + /* PR 17900: An exclamation mark in the attributes reverses + the sense of any of the attributes that follow. */ + case '!': + invert = !invert; + ptr_flags = invert ? &ptr->not_flags : &ptr->flags; + break; + case 'A': case 'a': *ptr_flags |= SEC_ALLOC; break; @@ -6185,7 +6588,8 @@ lang_set_flags (lang_memory_region_type *ptr, const char *flags, int invert) break; default: - einfo (_("%P%F: invalid syntax in flags\n")); + einfo (_("%P%F: invalid character %c (%d) in flags\n"), + *flags, *flags); break; } flags++; @@ -6200,9 +6604,9 @@ lang_for_each_input_file (void (*func) (lang_input_statement_type *)) { lang_input_statement_type *f; - for (f = (lang_input_statement_type *) input_file_chain.head; + for (f = &input_file_chain.head->input_statement; f != NULL; - f = (lang_input_statement_type *) f->next_real_file) + f = &f->next_real_file->input_statement) func (f); } @@ -6311,7 +6715,8 @@ lang_enter_output_section_statement (const char *output_section_statement_name, os->align_lma_with_input = align_with_input == ALIGN_WITH_INPUT; if (os->align_lma_with_input && align != NULL) - einfo (_("%F%P:%S: error: align with input and explicit align specified\n"), NULL); + einfo (_("%F%P:%S: error: align with input and explicit align specified\n"), + NULL); os->subsection_alignment = topower (exp_get_value_int (subalign, -1, "subsection alignment")); @@ -6329,7 +6734,6 @@ lang_final (void) new_stmt = new_stat (lang_output_statement, stat_ptr); new_stmt->name = output_filename; - } /* Reset the current counters in the regions. */ @@ -6410,13 +6814,12 @@ static void lang_gc_sections (void) { /* Keep all sections so marked in the link script. */ - lang_gc_sections_1 (statement_list.head); /* SEC_EXCLUDE is ignored when doing a relocatable link, except in the special case of debug info. (See bfd/stabs.c) Twiddle the flag here, to simplify later linker code. */ - if (link_info.relocatable) + if (bfd_link_relocatable (&link_info)) { LANG_FOR_EACH_INPUT_STATEMENT (f) { @@ -6462,6 +6865,7 @@ find_relro_section_callback (lang_wild_statement_type *ptr ATTRIBUTE_UNUSED, static void lang_find_relro_sections_1 (lang_statement_union_type *s, + seg_align_type *seg, bfd_boolean *has_relro_section) { if (*has_relro_section) @@ -6469,7 +6873,7 @@ lang_find_relro_sections_1 (lang_statement_union_type *s, for (; s != NULL; s = s->header.next) { - if (s == expld.dataseg.relro_end_stat) + if (s == seg->relro_end_stat) break; switch (s->header.type) @@ -6481,15 +6885,15 @@ lang_find_relro_sections_1 (lang_statement_union_type *s, break; case lang_constructors_statement_enum: lang_find_relro_sections_1 (constructor_list.head, - has_relro_section); + seg, has_relro_section); break; case lang_output_section_statement_enum: lang_find_relro_sections_1 (s->output_section_statement.children.head, - has_relro_section); + seg, has_relro_section); break; case lang_group_statement_enum: lang_find_relro_sections_1 (s->group_statement.children.head, - has_relro_section); + seg, has_relro_section); break; default: break; @@ -6505,7 +6909,7 @@ lang_find_relro_sections (void) /* Check all sections in the link script. */ lang_find_relro_sections_1 (expld.dataseg.relro_start_stat, - &has_relro_section); + &expld.dataseg, &has_relro_section); if (!has_relro_section) link_info.relro = FALSE; @@ -6591,7 +6995,7 @@ find_replacements_insert_point (void) if (claim1->flags.claimed) return claim1->flags.claim_archive ? lastobject : claim1; /* Update lastobject if this is a real object file. */ - if (claim1->the_bfd && (claim1->the_bfd->my_archive == NULL)) + if (claim1->the_bfd != NULL && claim1->the_bfd->my_archive == NULL) lastobject = claim1; } /* No files were claimed by the plugin. Choose the last object @@ -6600,6 +7004,51 @@ find_replacements_insert_point (void) return lastobject; } +/* Find where to insert ADD, an archive element or shared library + added during a rescan. */ + +static lang_statement_union_type ** +find_rescan_insertion (lang_input_statement_type *add) +{ + bfd *add_bfd = add->the_bfd; + lang_input_statement_type *f; + lang_input_statement_type *last_loaded = NULL; + lang_input_statement_type *before = NULL; + lang_statement_union_type **iter = NULL; + + if (add_bfd->my_archive != NULL) + add_bfd = add_bfd->my_archive; + + /* First look through the input file chain, to find an object file + before the one we've rescanned. Normal object files always + appear on both the input file chain and the file chain, so this + lets us get quickly to somewhere near the correct place on the + file chain if it is full of archive elements. Archives don't + appear on the file chain, but if an element has been extracted + then their input_statement->next points at it. */ + for (f = &input_file_chain.head->input_statement; + f != NULL; + f = &f->next_real_file->input_statement) + { + if (f->the_bfd == add_bfd) + { + before = last_loaded; + if (f->next != NULL) + return &f->next->input_statement.next; + } + if (f->the_bfd != NULL && f->next != NULL) + last_loaded = f; + } + + for (iter = before ? &before->next : &file_chain.head->input_statement.next; + *iter != NULL; + iter = &(*iter)->input_statement.next) + if ((*iter)->input_statement.the_bfd->my_archive == NULL) + break; + + return iter; +} + /* Insert SRCLIST into DESTLIST after given element by chaining on FIELD as the next-pointer. (Counterintuitively does not need a pointer to the actual after-node itself, just its chain field.) */ @@ -6633,6 +7082,66 @@ lang_list_remove_tail (lang_statement_list_type *destlist, } #endif /* ENABLE_PLUGINS */ +/* Add NAME to the list of garbage collection entry points. */ + +void +lang_add_gc_name (const char *name) +{ + struct bfd_sym_chain *sym; + + if (name == NULL) + return; + + sym = (struct bfd_sym_chain *) stat_alloc (sizeof (*sym)); + + sym->next = link_info.gc_sym_list; + sym->name = name; + link_info.gc_sym_list = sym; +} + +/* Check relocations. */ + +static void +lang_check_relocs (void) +{ + if (link_info.check_relocs_after_open_input) + { + bfd *abfd; + + for (abfd = link_info.input_bfds; + abfd != (bfd *) NULL; abfd = abfd->link.next) + if (!bfd_link_check_relocs (abfd, &link_info)) + { + /* No object output, fail return. */ + config.make_executable = FALSE; + /* Note: we do not abort the loop, but rather + continue the scan in case there are other + bad relocations to report. */ + } + } +} + +/* Look through all output sections looking for places where we can + propagate forward the lma region. */ + +static void +lang_propagate_lma_regions (void) +{ + lang_output_section_statement_type *os; + + for (os = &lang_output_section_statement.head->output_section_statement; + os != NULL; + os = os->next) + { + if (os->prev != NULL + && os->lma_region == NULL + && os->load_base == NULL + && os->addr_tree == NULL + && os->region == os->prev->region) + os->lma_region = os->prev->lma_region; + } +} + void lang_process (void) { @@ -6656,10 +7165,11 @@ lang_process (void) /* Create a bfd for each input file. */ current_target = default_target; + lang_statement_iteration++; open_input_bfds (statement_list.head, OPEN_BFD_NORMAL); #ifdef ENABLE_PLUGINS - if (plugin_active_plugins_p ()) + if (link_info.lto_plugin_active) { lang_statement_list_type added; lang_statement_list_type files, inputfiles; @@ -6668,7 +7178,7 @@ lang_process (void) are any more to be added to the link before we call the emulation's after_open hook. We create a private list of input statements for this purpose, which we will eventually - insert into the global statment list after the first claimed + insert into the global statement list after the first claimed file. */ added = *stat_ptr; /* We need to manipulate all three chains in synchrony. */ @@ -6678,7 +7188,6 @@ lang_process (void) einfo (_("%P%F: %s: plugin reported error after all symbols read\n"), plugin_error_plugin ()); /* Open any newly added files, updating the file chains. */ - link_info.loading_lto_outputs = TRUE; open_input_bfds (*added.tail, OPEN_BFD_NORMAL); /* Restore the global list pointer now they have all been added. */ lang_list_remove_tail (stat_ptr, &added); @@ -6711,14 +7220,64 @@ lang_process (void) lang_list_insert_after (&file_chain, &files, &file_chain.head); /* Rescan archives in case new undefined symbols have appeared. */ + files = file_chain; + lang_statement_iteration++; open_input_bfds (statement_list.head, OPEN_BFD_RESCAN); + lang_list_remove_tail (&file_chain, &files); + while (files.head != NULL) + { + lang_statement_union_type **insert; + lang_statement_union_type **iter, *temp; + bfd *my_arch; + + insert = find_rescan_insertion (&files.head->input_statement); + /* All elements from an archive can be added at once. */ + iter = &files.head->input_statement.next; + my_arch = files.head->input_statement.the_bfd->my_archive; + if (my_arch != NULL) + for (; *iter != NULL; iter = &(*iter)->input_statement.next) + if ((*iter)->input_statement.the_bfd->my_archive != my_arch) + break; + temp = *insert; + *insert = files.head; + files.head = *iter; + *iter = temp; + if (my_arch != NULL) + { + lang_input_statement_type *parent = my_arch->usrdata; + if (parent != NULL) + parent->next = (lang_statement_union_type *) + ((char *) iter + - offsetof (lang_input_statement_type, next)); + } + } } } #endif /* ENABLE_PLUGINS */ + /* Make sure that nobody has tried to add a symbol to this list + before now. */ + ASSERT (link_info.gc_sym_list == NULL); + link_info.gc_sym_list = &entry_symbol; + if (entry_symbol.name == NULL) - link_info.gc_sym_list = ldlang_undef_chain_list_head; + { + link_info.gc_sym_list = ldlang_undef_chain_list_head; + + /* entry_symbol is normally initialied by a ENTRY definition in the + linker script or the -e command line option. But if neither of + these have been used, the target specific backend may still have + provided an entry symbol via a call to lang_default_entry(). + Unfortunately this value will not be processed until lang_end() + is called, long after this function has finished. So detect this + case here and add the target's entry symbol to the list of starting + points for garbage collection resolution. */ + lang_add_gc_name (entry_symbol_default); + } + + lang_add_gc_name (link_info.init_function); + lang_add_gc_name (link_info.fini_function); ldemul_after_open (); if (config.map_file != NULL) @@ -6741,16 +7300,29 @@ lang_process (void) files. */ ldctor_build_sets (); + /* Give initial values for __start and __stop symbols, so that ELF + gc_sections will keep sections referenced by these symbols. Must + be done before lang_do_assignments below. */ + if (config.build_constructors) + lang_init_start_stop (); + /* PR 13683: We must rerun the assignments prior to running garbage collection in order to make sure that all symbol aliases are resolved. */ lang_do_assignments (lang_mark_phase_enum); + + lang_do_memory_regions(); expld.phase = lang_first_phase_enum; + /* Size up the common data. */ + lang_common (); + /* Remove unreferenced sections if asked to. */ lang_gc_sections (); - /* Size up the common data. */ - lang_common (); + /* Check relocations. */ + lang_check_relocs (); + + ldemul_after_check_relocs (); /* Update wild statements. */ update_wild_statements (statement_list.head); @@ -6765,7 +7337,7 @@ lang_process (void) /* Find any sections not attached explicitly and handle them. */ lang_place_orphans (); - if (! link_info.relocatable) + if (!bfd_link_relocatable (&link_info)) { asection *found; @@ -6787,6 +7359,20 @@ lang_process (void) } } + /* Copy forward lma regions for output sections in same lma region. */ + lang_propagate_lma_regions (); + + /* Defining __start/__stop symbols early for --gc-sections to work + around a glibc build problem can result in these symbols being + defined when they should not be. Fix them now. */ + if (config.build_constructors) + lang_undef_start_stop (); + + /* Define .startof./.sizeof. symbols with preliminary values before + dynamic symbols are created. */ + if (!bfd_link_relocatable (&link_info)) + lang_init_startof_sizeof (); + /* Do anything special before sizing sections. This is where ELF and other back-ends size dynamic sections. */ ldemul_before_allocation (); @@ -6796,18 +7382,18 @@ lang_process (void) lang_record_phdrs (); /* Check relro sections. */ - if (link_info.relro && ! link_info.relocatable) + if (link_info.relro && !bfd_link_relocatable (&link_info)) lang_find_relro_sections (); /* Size up the sections. */ - lang_size_sections (NULL, ! RELAXATION_ENABLED); + lang_size_sections (NULL, !RELAXATION_ENABLED); /* See if anything special should be done now we know how big everything is. This is where relaxation is done. */ ldemul_after_allocation (); - /* Fix any .startof. or .sizeof. symbols. */ - lang_set_startof (); + /* Fix any __start, __stop, .startof. or .sizeof. symbols. */ + lang_finalize_start_stop (); /* Do all the assignments, now that we know the final resting places of all the symbols. */ @@ -6815,10 +7401,16 @@ lang_process (void) ldemul_finish (); + /* Convert absolute symbols to section relative. */ + ldexp_finalize_syms (); + /* Make sure that the section addresses make sense. */ if (command_line.check_section_addresses) lang_check_section_addresses (); + /* Check any required symbols are known. */ + ldlang_check_require_defined_symbols (); + lang_end (); } @@ -6837,9 +7429,6 @@ lang_add_wild (struct wildcard_spec *filespec, curr != NULL; section_list = curr, curr = next) { - if (curr->spec.name != NULL && strcmp (curr->spec.name, "COMMON") == 0) - placed_commons = TRUE; - next = curr->next; curr->next = section_list; } @@ -6848,7 +7437,7 @@ lang_add_wild (struct wildcard_spec *filespec, { if (strcmp (filespec->name, "*") == 0) filespec->name = NULL; - else if (! wildcardp (filespec->name)) + else if (!wildcardp (filespec->name)) lang_has_input_file = TRUE; } @@ -6856,11 +7445,13 @@ lang_add_wild (struct wildcard_spec *filespec, new_stmt->filename = NULL; new_stmt->filenames_sorted = FALSE; new_stmt->section_flag_list = NULL; + new_stmt->exclude_name_list = NULL; if (filespec != NULL) { new_stmt->filename = filespec->name; new_stmt->filenames_sorted = filespec->sorted == by_name; new_stmt->section_flag_list = filespec->section_flag_list; + new_stmt->exclude_name_list = filespec->exclude_name_list; } new_stmt->section_list = section_list; new_stmt->keep_sections = keep_sections; @@ -6890,7 +7481,7 @@ lang_add_entry (const char *name, bfd_boolean cmdline) { if (entry_symbol.name == NULL || cmdline - || ! entry_from_cmdline) + || !entry_from_cmdline) { entry_symbol.name = name; entry_from_cmdline = cmdline; @@ -7037,7 +7628,7 @@ lang_get_regions (lang_memory_region_type **region, has been specified, then use the load region for the runtime region as well. */ if (lma_memspec != NULL - && ! have_vma + && !have_vma && strcmp (memspec, DEFAULT_MEMORY_REGION) == 0) *region = *lma_region; else @@ -7059,16 +7650,6 @@ lang_leave_output_section_statement (fill_type *fill, const char *memspec, current_section->load_base != NULL, current_section->addr_tree != NULL); - /* If this section has no load region or base, but uses the same - region as the previous section, then propagate the previous - section's load region. */ - - if (current_section->lma_region == NULL - && current_section->load_base == NULL - && current_section->addr_tree == NULL - && current_section->region == current_section->prev->region) - current_section->lma_region = current_section->prev->lma_region; - current_section->fill = fill; current_section->phdrs = phdrs; pop_stat_ptr (); @@ -7225,7 +7806,7 @@ lang_record_phdrs (void) if (last == NULL) { - lang_output_section_statement_type * tmp_os; + lang_output_section_statement_type *tmp_os; /* If we have not run across a section with a program header assigned to it yet, then scan forwards to find @@ -7277,9 +7858,9 @@ lang_record_phdrs (void) else at = exp_get_vma (l->at, 0, "phdr load address"); - if (! bfd_record_phdr (link_info.output_bfd, l->type, - l->flags != NULL, flags, l->at != NULL, - at, l->filehdr, l->phdrs, c, secs)) + if (!bfd_record_phdr (link_info.output_bfd, l->type, + l->flags != NULL, flags, l->at != NULL, + at, l->filehdr, l->phdrs, c, secs)) einfo (_("%F%P: bfd_record_phdr failed: %E\n")); } @@ -7299,7 +7880,7 @@ lang_record_phdrs (void) for (pl = os->phdrs; pl != NULL; pl = pl->next) - if (! pl->used && strcmp (pl->name, "NONE") != 0) + if (!pl->used && strcmp (pl->name, "NONE") != 0) einfo (_("%X%P: section `%s' assigned to non-existent phdr `%s'\n"), os->name, pl->name); } @@ -7315,11 +7896,21 @@ lang_add_nocrossref (lang_nocrossref_type *l) n = (struct lang_nocrossrefs *) xmalloc (sizeof *n); n->next = nocrossref_list; n->list = l; + n->onlyfirst = FALSE; nocrossref_list = n; /* Set notice_all so that we get informed about all symbols. */ link_info.notice_all = TRUE; } + +/* Record a section that cannot be referenced from a list of sections. */ + +void +lang_add_nocrossref_to (lang_nocrossref_type *l) +{ + lang_add_nocrossref (l); + nocrossref_list->onlyfirst = TRUE; +} /* Overlay handling. We handle overlays with some static variables. */ @@ -7509,6 +8100,7 @@ lang_leave_overlay (etree_type *lma_expr, overlay_vma = NULL; overlay_list = NULL; overlay_max = NULL; + overlay_subalign = NULL; } /* Version handling. This is only useful for ELF. */ @@ -8007,6 +8599,39 @@ lang_do_version_exports_section (void) lang_new_vers_node (greg, lreg), NULL); } +/* Evaluate LENGTH and ORIGIN parts of MEMORY spec */ + +static void +lang_do_memory_regions (void) +{ + lang_memory_region_type *r = lang_memory_region_list; + + for (; r != NULL; r = r->next) + { + if (r->origin_exp) + { + exp_fold_tree_no_dot (r->origin_exp); + if (expld.result.valid_p) + { + r->origin = expld.result.value; + r->current = r->origin; + } + else + einfo (_("%F%P: invalid origin for memory region %s\n"), + r->name_list.name); + } + if (r->length_exp) + { + exp_fold_tree_no_dot (r->length_exp); + if (expld.result.valid_p) + r->length = expld.result.value; + else + einfo (_("%F%P: invalid length for memory region %s\n"), + r->name_list.name); + } + } +} + void lang_add_unique (const char *name) { @@ -8052,7 +8677,7 @@ lang_append_dynamic_list (struct bfd_elf_version_expr *dynamic) void lang_append_dynamic_list_cpp_typeinfo (void) { - const char * symbols [] = + const char *symbols[] = { "typeinfo name for*", "typeinfo for*" @@ -8073,7 +8698,7 @@ lang_append_dynamic_list_cpp_typeinfo (void) void lang_append_dynamic_list_cpp_new (void) { - const char * symbols [] = + const char *symbols[] = { "operator new*", "operator delete*" @@ -8116,3 +8741,41 @@ lang_ld_feature (char *str) p = q; } } + +/* Pretty print memory amount. */ + +static void +lang_print_memory_size (bfd_vma sz) +{ + if ((sz & 0x3fffffff) == 0) + printf ("%10" BFD_VMA_FMT "u GB", sz >> 30); + else if ((sz & 0xfffff) == 0) + printf ("%10" BFD_VMA_FMT "u MB", sz >> 20); + else if ((sz & 0x3ff) == 0) + printf ("%10" BFD_VMA_FMT "u KB", sz >> 10); + else + printf (" %10" BFD_VMA_FMT "u B", sz); +} + +/* Implement --print-memory-usage: disply per region memory usage. */ + +void +lang_print_memory_usage (void) +{ + lang_memory_region_type *r; + + printf ("Memory region Used Size Region Size %%age Used\n"); + for (r = lang_memory_region_list; r->next != NULL; r = r->next) + { + bfd_vma used_length = r->current - r->origin; + double percent; + + printf ("%16s: ",r->name_list.name); + lang_print_memory_size (used_length); + lang_print_memory_size ((bfd_vma) r->length); + + percent = used_length * 100.0 / r->length; + + printf (" %6.2f%%\n", percent); + } +}