1 /* Linker command language support.
2 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 Free Software Foundation, Inc.
6 This file is part of GLD, the Gnu Linker.
8 GLD is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GLD is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GLD; see the file COPYING. If not, write to the Free
20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
25 #include "libiberty.h"
26 #include "safe-ctype.h"
45 #define offsetof(TYPE, MEMBER) ((size_t) & (((TYPE*) 0)->MEMBER))
48 /* Locals variables. */
49 static struct obstack stat_obstack;
50 static struct obstack map_obstack;
52 #define obstack_chunk_alloc xmalloc
53 #define obstack_chunk_free free
54 static const char *startup_file;
55 static lang_statement_list_type input_file_chain;
56 static bfd_boolean placed_commons = FALSE;
57 static lang_output_section_statement_type *default_common_section;
58 static bfd_boolean map_option_f;
59 static bfd_vma print_dot;
60 static lang_input_statement_type *first_file;
61 static const char *current_target;
62 static const char *output_target;
63 static lang_statement_list_type statement_list;
64 static struct lang_phdr *lang_phdr_list;
65 static struct bfd_hash_table lang_definedness_table;
67 /* Forward declarations. */
68 static void exp_init_os (etree_type *);
69 static void init_map_userdata (bfd *, asection *, void *);
70 static bfd_boolean wildcardp (const char *);
71 static lang_input_statement_type *lookup_name (const char *);
72 static bfd_boolean load_symbols (lang_input_statement_type *,
73 lang_statement_list_type *);
74 static struct bfd_hash_entry *lang_definedness_newfunc
75 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
76 static void insert_undefined (const char *);
77 static void print_all_symbols (asection *);
78 static bfd_boolean sort_def_symbol (struct bfd_link_hash_entry *, void *);
79 static void print_statement (lang_statement_union_type *,
80 lang_output_section_statement_type *);
81 static void print_statement_list (lang_statement_union_type *,
82 lang_output_section_statement_type *);
83 static void print_statements (void);
84 static bfd_boolean lang_one_common (struct bfd_link_hash_entry *, void *);
85 static void lang_record_phdrs (void);
86 static void lang_do_version_exports_section (void);
88 typedef void (*callback_t) (lang_wild_statement_type *, struct wildcard_list *,
89 asection *, lang_input_statement_type *, void *);
91 /* Exported variables. */
92 lang_output_section_statement_type *abs_output_section;
93 lang_statement_list_type lang_output_section_statement;
94 lang_statement_list_type *stat_ptr = &statement_list;
95 lang_statement_list_type file_chain = { NULL, NULL };
96 struct bfd_sym_chain entry_symbol = { NULL, NULL };
97 const char *entry_section = ".text";
98 bfd_boolean entry_from_cmdline;
99 bfd_boolean lang_has_input_file = FALSE;
100 bfd_boolean had_output_filename = FALSE;
101 bfd_boolean lang_float_flag = FALSE;
102 bfd_boolean delete_output_file_on_failure = FALSE;
103 struct lang_nocrossrefs *nocrossref_list;
104 struct unique_sections *unique_section_list;
105 static bfd_boolean ldlang_sysrooted_script = FALSE;
106 int lang_statement_iteration = 0;
108 etree_type *base; /* Relocation base - or null */
110 #define new_stat(x, y) \
111 (x##_type *) new_statement (x##_enum, sizeof (x##_type), y)
113 #define outside_section_address(q) \
114 ((q)->output_offset + (q)->output_section->vma)
116 #define outside_symbol_address(q) \
117 ((q)->value + outside_section_address (q->section))
119 #define SECTION_NAME_MAP_LENGTH (16)
122 stat_alloc (size_t size)
124 return obstack_alloc (&stat_obstack, size);
128 unique_section_p (const asection *sec)
130 struct unique_sections *unam;
133 if (link_info.relocatable
134 && sec->owner != NULL
135 && bfd_is_group_section (sec->owner, sec))
139 for (unam = unique_section_list; unam; unam = unam->next)
140 if (wildcardp (unam->name)
141 ? fnmatch (unam->name, secnam, 0) == 0
142 : strcmp (unam->name, secnam) == 0)
150 /* Generic traversal routines for finding matching sections. */
153 walk_wild_section (lang_wild_statement_type *ptr,
154 lang_input_statement_type *file,
160 if (file->just_syms_flag)
163 for (s = file->the_bfd->sections; s != NULL; s = s->next)
165 struct wildcard_list *sec;
167 sec = ptr->section_list;
169 (*callback) (ptr, sec, s, file, data);
173 bfd_boolean skip = FALSE;
174 struct name_list *list_tmp;
176 /* Don't process sections from files which were
178 for (list_tmp = sec->spec.exclude_name_list;
180 list_tmp = list_tmp->next)
182 if (wildcardp (list_tmp->name))
183 skip = fnmatch (list_tmp->name, file->filename, 0) == 0;
185 skip = strcmp (list_tmp->name, file->filename) == 0;
187 /* If this file is part of an archive, and the archive is
188 excluded, exclude this file. */
189 if (! skip && file->the_bfd != NULL
190 && file->the_bfd->my_archive != NULL
191 && file->the_bfd->my_archive->filename != NULL)
193 if (wildcardp (list_tmp->name))
194 skip = fnmatch (list_tmp->name,
195 file->the_bfd->my_archive->filename,
198 skip = strcmp (list_tmp->name,
199 file->the_bfd->my_archive->filename) == 0;
206 if (!skip && sec->spec.name != NULL)
208 const char *sname = bfd_get_section_name (file->the_bfd, s);
210 if (wildcardp (sec->spec.name))
211 skip = fnmatch (sec->spec.name, sname, 0) != 0;
213 skip = strcmp (sec->spec.name, sname) != 0;
217 (*callback) (ptr, sec, s, file, data);
224 /* Handle a wild statement for a single file F. */
227 walk_wild_file (lang_wild_statement_type *s,
228 lang_input_statement_type *f,
232 if (f->the_bfd == NULL
233 || ! bfd_check_format (f->the_bfd, bfd_archive))
234 walk_wild_section (s, f, callback, data);
239 /* This is an archive file. We must map each member of the
240 archive separately. */
241 member = bfd_openr_next_archived_file (f->the_bfd, NULL);
242 while (member != NULL)
244 /* When lookup_name is called, it will call the add_symbols
245 entry point for the archive. For each element of the
246 archive which is included, BFD will call ldlang_add_file,
247 which will set the usrdata field of the member to the
248 lang_input_statement. */
249 if (member->usrdata != NULL)
251 walk_wild_section (s, member->usrdata, callback, data);
254 member = bfd_openr_next_archived_file (f->the_bfd, member);
260 walk_wild (lang_wild_statement_type *s, callback_t callback, void *data)
262 const char *file_spec = s->filename;
264 if (file_spec == NULL)
266 /* Perform the iteration over all files in the list. */
267 LANG_FOR_EACH_INPUT_STATEMENT (f)
269 walk_wild_file (s, f, callback, data);
272 else if (wildcardp (file_spec))
274 LANG_FOR_EACH_INPUT_STATEMENT (f)
276 if (fnmatch (file_spec, f->filename, FNM_FILE_NAME) == 0)
277 walk_wild_file (s, f, callback, data);
282 lang_input_statement_type *f;
284 /* Perform the iteration over a single file. */
285 f = lookup_name (file_spec);
287 walk_wild_file (s, f, callback, data);
291 /* lang_for_each_statement walks the parse tree and calls the provided
292 function for each node. */
295 lang_for_each_statement_worker (void (*func) (lang_statement_union_type *),
296 lang_statement_union_type *s)
298 for (; s != NULL; s = s->header.next)
302 switch (s->header.type)
304 case lang_constructors_statement_enum:
305 lang_for_each_statement_worker (func, constructor_list.head);
307 case lang_output_section_statement_enum:
308 lang_for_each_statement_worker
310 s->output_section_statement.children.head);
312 case lang_wild_statement_enum:
313 lang_for_each_statement_worker
315 s->wild_statement.children.head);
317 case lang_group_statement_enum:
318 lang_for_each_statement_worker (func,
319 s->group_statement.children.head);
321 case lang_data_statement_enum:
322 case lang_reloc_statement_enum:
323 case lang_object_symbols_statement_enum:
324 case lang_output_statement_enum:
325 case lang_target_statement_enum:
326 case lang_input_section_enum:
327 case lang_input_statement_enum:
328 case lang_assignment_statement_enum:
329 case lang_padding_statement_enum:
330 case lang_address_statement_enum:
331 case lang_fill_statement_enum:
341 lang_for_each_statement (void (*func) (lang_statement_union_type *))
343 lang_for_each_statement_worker (func, statement_list.head);
346 /*----------------------------------------------------------------------*/
349 lang_list_init (lang_statement_list_type *list)
352 list->tail = &list->head;
355 /* Build a new statement node for the parse tree. */
357 static lang_statement_union_type *
358 new_statement (enum statement_enum type,
360 lang_statement_list_type *list)
362 lang_statement_union_type *new;
364 new = stat_alloc (size);
365 new->header.type = type;
366 new->header.next = NULL;
367 lang_statement_append (list, new, &new->header.next);
371 /* Build a new input file node for the language. There are several
372 ways in which we treat an input file, eg, we only look at symbols,
373 or prefix it with a -l etc.
375 We can be supplied with requests for input files more than once;
376 they may, for example be split over several lines like foo.o(.text)
377 foo.o(.data) etc, so when asked for a file we check that we haven't
378 got it already so we don't duplicate the bfd. */
380 static lang_input_statement_type *
381 new_afile (const char *name,
382 lang_input_file_enum_type file_type,
384 bfd_boolean add_to_list)
386 lang_input_statement_type *p;
389 p = new_stat (lang_input_statement, stat_ptr);
392 p = stat_alloc (sizeof (lang_input_statement_type));
393 p->header.next = NULL;
396 lang_has_input_file = TRUE;
398 p->sysrooted = FALSE;
401 case lang_input_file_is_symbols_only_enum:
403 p->is_archive = FALSE;
405 p->local_sym_name = name;
406 p->just_syms_flag = TRUE;
407 p->search_dirs_flag = FALSE;
409 case lang_input_file_is_fake_enum:
411 p->is_archive = FALSE;
413 p->local_sym_name = name;
414 p->just_syms_flag = FALSE;
415 p->search_dirs_flag = FALSE;
417 case lang_input_file_is_l_enum:
418 p->is_archive = TRUE;
421 p->local_sym_name = concat ("-l", name, NULL);
422 p->just_syms_flag = FALSE;
423 p->search_dirs_flag = TRUE;
425 case lang_input_file_is_marker_enum:
427 p->is_archive = FALSE;
429 p->local_sym_name = name;
430 p->just_syms_flag = FALSE;
431 p->search_dirs_flag = TRUE;
433 case lang_input_file_is_search_file_enum:
434 p->sysrooted = ldlang_sysrooted_script;
436 p->is_archive = FALSE;
438 p->local_sym_name = name;
439 p->just_syms_flag = FALSE;
440 p->search_dirs_flag = TRUE;
442 case lang_input_file_is_file_enum:
444 p->is_archive = FALSE;
446 p->local_sym_name = name;
447 p->just_syms_flag = FALSE;
448 p->search_dirs_flag = FALSE;
455 p->next_real_file = NULL;
458 p->dynamic = config.dynamic_link;
459 p->as_needed = as_needed;
460 p->whole_archive = whole_archive;
462 lang_statement_append (&input_file_chain,
463 (lang_statement_union_type *) p,
468 lang_input_statement_type *
469 lang_add_input_file (const char *name,
470 lang_input_file_enum_type file_type,
473 lang_has_input_file = TRUE;
474 return new_afile (name, file_type, target, TRUE);
477 /* Build enough state so that the parser can build its tree. */
482 obstack_begin (&stat_obstack, 1000);
484 stat_ptr = &statement_list;
486 lang_list_init (stat_ptr);
488 lang_list_init (&input_file_chain);
489 lang_list_init (&lang_output_section_statement);
490 lang_list_init (&file_chain);
491 first_file = lang_add_input_file (NULL, lang_input_file_is_marker_enum,
494 lang_output_section_statement_lookup (BFD_ABS_SECTION_NAME);
496 abs_output_section->bfd_section = bfd_abs_section_ptr;
498 /* The value "3" is ad-hoc, somewhat related to the expected number of
499 DEFINED expressions in a linker script. For most default linker
500 scripts, there are none. Why a hash table then? Well, it's somewhat
501 simpler to re-use working machinery than using a linked list in terms
502 of code-complexity here in ld, besides the initialization which just
503 looks like other code here. */
504 if (bfd_hash_table_init_n (&lang_definedness_table,
505 lang_definedness_newfunc, 3) != TRUE)
506 einfo (_("%P%F: out of memory during initialization"));
508 /* Callers of exp_fold_tree need to increment this. */
509 lang_statement_iteration = 0;
512 /*----------------------------------------------------------------------
513 A region is an area of memory declared with the
514 MEMORY { name:org=exp, len=exp ... }
517 We maintain a list of all the regions here.
519 If no regions are specified in the script, then the default is used
520 which is created when looked up to be the entire data space.
522 If create is true we are creating a region inside a MEMORY block.
523 In this case it is probably an error to create a region that has
524 already been created. If we are not inside a MEMORY block it is
525 dubious to use an undeclared region name (except DEFAULT_MEMORY_REGION)
526 and so we issue a warning. */
528 static lang_memory_region_type *lang_memory_region_list;
529 static lang_memory_region_type **lang_memory_region_list_tail = &lang_memory_region_list;
531 lang_memory_region_type *
532 lang_memory_region_lookup (const char *const name, bfd_boolean create)
534 lang_memory_region_type *p;
535 lang_memory_region_type *new;
537 /* NAME is NULL for LMA memspecs if no region was specified. */
541 for (p = lang_memory_region_list; p != NULL; p = p->next)
542 if (strcmp (p->name, name) == 0)
545 einfo (_("%P:%S: warning: redeclaration of memory region '%s'\n"), name);
550 /* This code used to always use the first region in the list as the
551 default region. I changed it to instead use a region
552 encompassing all of memory as the default region. This permits
553 NOLOAD sections to work reasonably without requiring a region.
554 People should specify what region they mean, if they really want
556 if (strcmp (name, DEFAULT_MEMORY_REGION) == 0)
558 if (lang_memory_region_list != NULL)
559 return lang_memory_region_list;
563 if (!create && strcmp (name, DEFAULT_MEMORY_REGION))
564 einfo (_("%P:%S: warning: memory region %s not declared\n"), name);
566 new = stat_alloc (sizeof (lang_memory_region_type));
568 new->name = xstrdup (name);
571 *lang_memory_region_list_tail = new;
572 lang_memory_region_list_tail = &new->next;
576 new->length = ~(bfd_size_type) 0;
578 new->had_full_message = FALSE;
583 static lang_memory_region_type *
584 lang_memory_default (asection *section)
586 lang_memory_region_type *p;
588 flagword sec_flags = section->flags;
590 /* Override SEC_DATA to mean a writable section. */
591 if ((sec_flags & (SEC_ALLOC | SEC_READONLY | SEC_CODE)) == SEC_ALLOC)
592 sec_flags |= SEC_DATA;
594 for (p = lang_memory_region_list; p != NULL; p = p->next)
596 if ((p->flags & sec_flags) != 0
597 && (p->not_flags & sec_flags) == 0)
602 return lang_memory_region_lookup (DEFAULT_MEMORY_REGION, FALSE);
605 static lang_output_section_statement_type *
606 lang_output_section_find_1 (const char *const name, int constraint)
608 lang_statement_union_type *u;
609 lang_output_section_statement_type *lookup;
611 for (u = lang_output_section_statement.head; u != NULL; u = lookup->next)
613 lookup = &u->output_section_statement;
614 if (strcmp (name, lookup->name) == 0
615 && lookup->constraint != -1
616 && (constraint == 0 || constraint == lookup->constraint))
622 lang_output_section_statement_type *
623 lang_output_section_find (const char *const name)
625 return lang_output_section_find_1 (name, 0);
628 static lang_output_section_statement_type *
629 lang_output_section_statement_lookup_1 (const char *const name, int constraint)
631 lang_output_section_statement_type *lookup;
633 lookup = lang_output_section_find_1 (name, constraint);
636 lookup = new_stat (lang_output_section_statement, stat_ptr);
637 lookup->region = NULL;
638 lookup->lma_region = NULL;
640 lookup->block_value = 1;
644 lookup->bfd_section = NULL;
645 lookup->processed = 0;
646 lookup->constraint = constraint;
647 lookup->sectype = normal_section;
648 lookup->addr_tree = NULL;
649 lang_list_init (&lookup->children);
651 lookup->memspec = NULL;
653 lookup->subsection_alignment = -1;
654 lookup->section_alignment = -1;
655 lookup->load_base = NULL;
656 lookup->update_dot_tree = NULL;
657 lookup->phdrs = NULL;
659 lang_statement_append (&lang_output_section_statement,
660 (lang_statement_union_type *) lookup,
666 lang_output_section_statement_type *
667 lang_output_section_statement_lookup (const char *const name)
669 return lang_output_section_statement_lookup_1 (name, 0);
673 lang_map_flags (flagword flag)
675 if (flag & SEC_ALLOC)
681 if (flag & SEC_READONLY)
694 lang_memory_region_type *m;
697 minfo (_("\nMemory Configuration\n\n"));
698 fprintf (config.map_file, "%-16s %-18s %-18s %s\n",
699 _("Name"), _("Origin"), _("Length"), _("Attributes"));
701 for (m = lang_memory_region_list; m != NULL; m = m->next)
706 fprintf (config.map_file, "%-16s ", m->name);
708 sprintf_vma (buf, m->origin);
709 minfo ("0x%s ", buf);
717 minfo ("0x%V", m->length);
718 if (m->flags || m->not_flags)
726 lang_map_flags (m->flags);
732 lang_map_flags (m->not_flags);
739 fprintf (config.map_file, _("\nLinker script and memory map\n\n"));
741 if (! command_line.reduce_memory_overheads)
743 obstack_begin (&map_obstack, 1000);
744 for (p = link_info.input_bfds; p != (bfd *) NULL; p = p->link_next)
745 bfd_map_over_sections (p, init_map_userdata, 0);
746 bfd_link_hash_traverse (link_info.hash, sort_def_symbol, 0);
752 init_map_userdata (abfd, sec, data)
753 bfd *abfd ATTRIBUTE_UNUSED;
755 void *data ATTRIBUTE_UNUSED;
757 fat_section_userdata_type *new_data
758 = ((fat_section_userdata_type *) (stat_alloc
759 (sizeof (fat_section_userdata_type))));
761 ASSERT (get_userdata (sec) == NULL);
762 get_userdata (sec) = new_data;
763 new_data->map_symbol_def_tail = &new_data->map_symbol_def_head;
767 sort_def_symbol (hash_entry, info)
768 struct bfd_link_hash_entry *hash_entry;
769 void *info ATTRIBUTE_UNUSED;
771 if (hash_entry->type == bfd_link_hash_defined
772 || hash_entry->type == bfd_link_hash_defweak)
774 struct fat_user_section_struct *ud;
775 struct map_symbol_def *def;
777 ud = get_userdata (hash_entry->u.def.section);
780 /* ??? What do we have to do to initialize this beforehand? */
781 /* The first time we get here is bfd_abs_section... */
782 init_map_userdata (0, hash_entry->u.def.section, 0);
783 ud = get_userdata (hash_entry->u.def.section);
785 else if (!ud->map_symbol_def_tail)
786 ud->map_symbol_def_tail = &ud->map_symbol_def_head;
787 def = (struct map_symbol_def *) obstack_alloc (&map_obstack, sizeof *def);
788 def->entry = hash_entry;
789 *ud->map_symbol_def_tail = def;
790 ud->map_symbol_def_tail = &def->next;
795 /* Initialize an output section. */
798 init_os (lang_output_section_statement_type *s)
800 lean_section_userdata_type *new;
802 if (s->bfd_section != NULL)
805 if (strcmp (s->name, DISCARD_SECTION_NAME) == 0)
806 einfo (_("%P%F: Illegal use of `%s' section\n"), DISCARD_SECTION_NAME);
808 new = stat_alloc (SECTION_USERDATA_SIZE);
810 s->bfd_section = bfd_get_section_by_name (output_bfd, s->name);
811 if (s->bfd_section == NULL)
812 s->bfd_section = bfd_make_section (output_bfd, s->name);
813 if (s->bfd_section == NULL)
815 einfo (_("%P%F: output format %s cannot represent section called %s\n"),
816 output_bfd->xvec->name, s->name);
818 s->bfd_section->output_section = s->bfd_section;
820 /* We initialize an output sections output offset to minus its own
821 vma to allow us to output a section through itself. */
822 s->bfd_section->output_offset = 0;
823 get_userdata (s->bfd_section) = new;
825 /* If there is a base address, make sure that any sections it might
826 mention are initialized. */
827 if (s->addr_tree != NULL)
828 exp_init_os (s->addr_tree);
830 if (s->load_base != NULL)
831 exp_init_os (s->load_base);
834 /* Make sure that all output sections mentioned in an expression are
838 exp_init_os (etree_type *exp)
840 switch (exp->type.node_class)
843 exp_init_os (exp->assign.src);
847 exp_init_os (exp->binary.lhs);
848 exp_init_os (exp->binary.rhs);
852 exp_init_os (exp->trinary.cond);
853 exp_init_os (exp->trinary.lhs);
854 exp_init_os (exp->trinary.rhs);
858 exp_init_os (exp->assert_s.child);
862 exp_init_os (exp->unary.child);
866 switch (exp->type.node_code)
872 lang_output_section_statement_type *os;
874 os = lang_output_section_find (exp->name.name);
875 if (os != NULL && os->bfd_section == NULL)
886 /* Sections marked with the SEC_LINK_ONCE flag should only be linked
887 once into the output. This routine checks each section, and
888 arrange to discard it if a section of the same name has already
889 been linked. If the section has COMDAT information, then it uses
890 that to decide whether the section should be included. This code
891 assumes that all relevant sections have the SEC_LINK_ONCE flag set;
892 that is, it does not depend solely upon the section name.
893 section_already_linked is called via bfd_map_over_sections. */
895 /* This is the shape of the elements inside the already_linked hash
896 table. It maps a name onto a list of already_linked elements with
897 the same name. It's possible to get more than one element in a
898 list if the COMDAT sections have different names. */
900 struct already_linked_hash_entry
902 struct bfd_hash_entry root;
903 struct already_linked *entry;
906 struct already_linked
908 struct already_linked *next;
912 /* The hash table. */
914 static struct bfd_hash_table already_linked_table;
917 section_already_linked (bfd *abfd, asection *sec, void *data)
919 lang_input_statement_type *entry = data;
922 struct already_linked *l;
923 struct already_linked_hash_entry *already_linked_list;
925 /* If we are only reading symbols from this object, then we want to
926 discard all sections. */
927 if (entry->just_syms_flag)
929 bfd_link_just_syms (sec, &link_info);
933 flags = bfd_get_section_flags (abfd, sec);
935 if ((flags & SEC_LINK_ONCE) == 0)
938 /* FIXME: When doing a relocatable link, we may have trouble
939 copying relocations in other sections that refer to local symbols
940 in the section being discarded. Those relocations will have to
941 be converted somehow; as of this writing I'm not sure that any of
942 the backends handle that correctly.
944 It is tempting to instead not discard link once sections when
945 doing a relocatable link (technically, they should be discarded
946 whenever we are building constructors). However, that fails,
947 because the linker winds up combining all the link once sections
948 into a single large link once section, which defeats the purpose
949 of having link once sections in the first place.
951 Also, not merging link once sections in a relocatable link
952 causes trouble for MIPS ELF, which relies on link once semantics
953 to handle the .reginfo section correctly. */
955 name = bfd_get_section_name (abfd, sec);
957 already_linked_list =
958 ((struct already_linked_hash_entry *)
959 bfd_hash_lookup (&already_linked_table, name, TRUE, FALSE));
961 for (l = already_linked_list->entry; l != NULL; l = l->next)
963 if (sec->comdat == NULL
964 || l->sec->comdat == NULL
965 || strcmp (sec->comdat->name, l->sec->comdat->name) == 0)
967 /* The section has already been linked. See if we should
969 switch (flags & SEC_LINK_DUPLICATES)
974 case SEC_LINK_DUPLICATES_DISCARD:
977 case SEC_LINK_DUPLICATES_ONE_ONLY:
978 if (sec->comdat == NULL)
979 einfo (_("%P: %B: warning: ignoring duplicate section `%s'\n"),
982 einfo (_("%P: %B: warning: ignoring duplicate `%s' section symbol `%s'\n"),
983 abfd, name, sec->comdat->name);
986 case SEC_LINK_DUPLICATES_SAME_CONTENTS:
987 /* FIXME: We should really dig out the contents of both
988 sections and memcmp them. The COFF/PE spec says that
989 the Microsoft linker does not implement this
990 correctly, so I'm not going to bother doing it
993 case SEC_LINK_DUPLICATES_SAME_SIZE:
994 if (bfd_section_size (abfd, sec)
995 != bfd_section_size (l->sec->owner, l->sec))
996 einfo (_("%P: %B: warning: duplicate section `%s' has different size\n"),
1001 /* Set the output_section field so that lang_add_section
1002 does not create a lang_input_section structure for this
1003 section. Since there might be a symbol in the section
1004 being discarded, we must retain a pointer to the section
1005 which we are really going to use. */
1006 sec->output_section = bfd_abs_section_ptr;
1007 sec->kept_section = l->sec;
1009 if (flags & SEC_GROUP)
1010 bfd_discard_group (abfd, sec);
1016 /* This is the first section with this name. Record it. Allocate
1017 the memory from the same obstack as the hash table is kept in. */
1019 l = bfd_hash_allocate (&already_linked_table, sizeof *l);
1022 l->next = already_linked_list->entry;
1023 already_linked_list->entry = l;
1026 /* Support routines for the hash table used by section_already_linked,
1027 initialize the table, fill in an entry and remove the table. */
1029 static struct bfd_hash_entry *
1030 already_linked_newfunc (struct bfd_hash_entry *entry ATTRIBUTE_UNUSED,
1031 struct bfd_hash_table *table,
1032 const char *string ATTRIBUTE_UNUSED)
1034 struct already_linked_hash_entry *ret =
1035 bfd_hash_allocate (table, sizeof (struct already_linked_hash_entry));
1043 already_linked_table_init (void)
1045 if (! bfd_hash_table_init_n (&already_linked_table,
1046 already_linked_newfunc,
1048 einfo (_("%P%F: Failed to create hash table\n"));
1052 already_linked_table_free (void)
1054 bfd_hash_table_free (&already_linked_table);
1057 /* The wild routines.
1059 These expand statements like *(.text) and foo.o to a list of
1060 explicit actions, like foo.o(.text), bar.o(.text) and
1061 foo.o(.text, .data). */
1063 /* Return TRUE if the PATTERN argument is a wildcard pattern.
1064 Although backslashes are treated specially if a pattern contains
1065 wildcards, we do not consider the mere presence of a backslash to
1066 be enough to cause the pattern to be treated as a wildcard.
1067 That lets us handle DOS filenames more naturally. */
1070 wildcardp (const char *pattern)
1074 for (s = pattern; *s != '\0'; ++s)
1082 /* Add SECTION to the output section OUTPUT. Do this by creating a
1083 lang_input_section statement which is placed at PTR. FILE is the
1084 input file which holds SECTION. */
1087 lang_add_section (lang_statement_list_type *ptr,
1089 lang_output_section_statement_type *output,
1090 lang_input_statement_type *file)
1093 bfd_boolean discard;
1095 flags = bfd_get_section_flags (section->owner, section);
1097 /* SEC_EXCLUDE is ignored when doing a relocatable link, except in
1098 the special case of debug info. (See bfd/stabs.c) */
1099 if (link_info.relocatable && (flags & SEC_DEBUGGING) == 0)
1101 flags &= ~SEC_EXCLUDE;
1103 /* Write the modified flag back, to simplify later linker
1105 if (section->owner != NULL)
1106 bfd_set_section_flags (section->owner, section, flags);
1109 /* Discard sections marked with SEC_EXCLUDE. */
1110 discard = (flags & SEC_EXCLUDE) != 0;
1112 /* Discard input sections which are assigned to a section named
1113 DISCARD_SECTION_NAME. */
1114 if (strcmp (output->name, DISCARD_SECTION_NAME) == 0)
1117 /* Discard debugging sections if we are stripping debugging
1119 if ((link_info.strip == strip_debugger || link_info.strip == strip_all)
1120 && (flags & SEC_DEBUGGING) != 0)
1125 if (section->output_section == NULL)
1127 /* This prevents future calls from assigning this section. */
1128 section->output_section = bfd_abs_section_ptr;
1133 if (section->output_section == NULL)
1136 lang_input_section_type *new;
1139 if (output->bfd_section == NULL)
1142 first = ! output->bfd_section->linker_has_input;
1143 output->bfd_section->linker_has_input = 1;
1145 /* Add a section reference to the list. */
1146 new = new_stat (lang_input_section, ptr);
1148 new->section = section;
1150 section->output_section = output->bfd_section;
1152 flags = section->flags;
1154 /* We don't copy the SEC_NEVER_LOAD flag from an input section
1155 to an output section, because we want to be able to include a
1156 SEC_NEVER_LOAD section in the middle of an otherwise loaded
1157 section (I don't know why we want to do this, but we do).
1158 build_link_order in ldwrite.c handles this case by turning
1159 the embedded SEC_NEVER_LOAD section into a fill. */
1161 flags &= ~ SEC_NEVER_LOAD;
1163 /* If final link, don't copy the SEC_LINK_ONCE flags, they've
1164 already been processed. One reason to do this is that on pe
1165 format targets, .text$foo sections go into .text and it's odd
1166 to see .text with SEC_LINK_ONCE set. */
1168 if (! link_info.relocatable)
1169 flags &= ~ (SEC_LINK_ONCE | SEC_LINK_DUPLICATES);
1171 /* If this is not the first input section, and the SEC_READONLY
1172 flag is not currently set, then don't set it just because the
1173 input section has it set. */
1175 if (! first && (section->output_section->flags & SEC_READONLY) == 0)
1176 flags &= ~ SEC_READONLY;
1178 /* Keep SEC_MERGE and SEC_STRINGS only if they are the same. */
1180 && ((section->output_section->flags & (SEC_MERGE | SEC_STRINGS))
1181 != (flags & (SEC_MERGE | SEC_STRINGS))
1182 || ((flags & SEC_MERGE)
1183 && section->output_section->entsize != section->entsize)))
1185 section->output_section->flags &= ~ (SEC_MERGE | SEC_STRINGS);
1186 flags &= ~ (SEC_MERGE | SEC_STRINGS);
1189 section->output_section->flags |= flags;
1191 if (flags & SEC_MERGE)
1192 section->output_section->entsize = section->entsize;
1194 /* If SEC_READONLY is not set in the input section, then clear
1195 it from the output section. */
1196 if ((section->flags & SEC_READONLY) == 0)
1197 section->output_section->flags &= ~SEC_READONLY;
1199 switch (output->sectype)
1201 case normal_section:
1206 case overlay_section:
1207 output->bfd_section->flags &= ~SEC_ALLOC;
1209 case noload_section:
1210 output->bfd_section->flags &= ~SEC_LOAD;
1211 output->bfd_section->flags |= SEC_NEVER_LOAD;
1215 /* Copy over SEC_SMALL_DATA. */
1216 if (section->flags & SEC_SMALL_DATA)
1217 section->output_section->flags |= SEC_SMALL_DATA;
1219 if (section->alignment_power > output->bfd_section->alignment_power)
1220 output->bfd_section->alignment_power = section->alignment_power;
1222 /* If supplied an alignment, then force it. */
1223 if (output->section_alignment != -1)
1224 output->bfd_section->alignment_power = output->section_alignment;
1226 if (section->flags & SEC_BLOCK)
1228 section->output_section->flags |= SEC_BLOCK;
1229 /* FIXME: This value should really be obtained from the bfd... */
1230 output->block_value = 128;
1235 /* Handle wildcard sorting. This returns the lang_input_section which
1236 should follow the one we are going to create for SECTION and FILE,
1237 based on the sorting requirements of WILD. It returns NULL if the
1238 new section should just go at the end of the current list. */
1240 static lang_statement_union_type *
1241 wild_sort (lang_wild_statement_type *wild,
1242 struct wildcard_list *sec,
1243 lang_input_statement_type *file,
1246 const char *section_name;
1247 lang_statement_union_type *l;
1249 if (!wild->filenames_sorted && (sec == NULL || !sec->spec.sorted))
1252 section_name = bfd_get_section_name (file->the_bfd, section);
1253 for (l = wild->children.head; l != NULL; l = l->header.next)
1255 lang_input_section_type *ls;
1257 if (l->header.type != lang_input_section_enum)
1259 ls = &l->input_section;
1261 /* Sorting by filename takes precedence over sorting by section
1264 if (wild->filenames_sorted)
1266 const char *fn, *ln;
1270 /* The PE support for the .idata section as generated by
1271 dlltool assumes that files will be sorted by the name of
1272 the archive and then the name of the file within the
1275 if (file->the_bfd != NULL
1276 && bfd_my_archive (file->the_bfd) != NULL)
1278 fn = bfd_get_filename (bfd_my_archive (file->the_bfd));
1283 fn = file->filename;
1287 if (ls->ifile->the_bfd != NULL
1288 && bfd_my_archive (ls->ifile->the_bfd) != NULL)
1290 ln = bfd_get_filename (bfd_my_archive (ls->ifile->the_bfd));
1295 ln = ls->ifile->filename;
1299 i = strcmp (fn, ln);
1308 fn = file->filename;
1310 ln = ls->ifile->filename;
1312 i = strcmp (fn, ln);
1320 /* Here either the files are not sorted by name, or we are
1321 looking at the sections for this file. */
1323 if (sec != NULL && sec->spec.sorted)
1325 if (strcmp (section_name,
1326 bfd_get_section_name (ls->ifile->the_bfd,
1336 /* Expand a wild statement for a particular FILE. SECTION may be
1337 NULL, in which case it is a wild card. */
1340 output_section_callback (lang_wild_statement_type *ptr,
1341 struct wildcard_list *sec,
1343 lang_input_statement_type *file,
1346 lang_statement_union_type *before;
1348 /* Exclude sections that match UNIQUE_SECTION_LIST. */
1349 if (unique_section_p (section))
1352 /* If the wild pattern was marked KEEP, the member sections
1353 should be as well. */
1354 if (ptr->keep_sections)
1355 section->flags |= SEC_KEEP;
1357 before = wild_sort (ptr, sec, file, section);
1359 /* Here BEFORE points to the lang_input_section which
1360 should follow the one we are about to add. If BEFORE
1361 is NULL, then the section should just go at the end
1362 of the current list. */
1365 lang_add_section (&ptr->children, section,
1366 (lang_output_section_statement_type *) output,
1370 lang_statement_list_type list;
1371 lang_statement_union_type **pp;
1373 lang_list_init (&list);
1374 lang_add_section (&list, section,
1375 (lang_output_section_statement_type *) output,
1378 /* If we are discarding the section, LIST.HEAD will
1380 if (list.head != NULL)
1382 ASSERT (list.head->header.next == NULL);
1384 for (pp = &ptr->children.head;
1386 pp = &(*pp)->header.next)
1387 ASSERT (*pp != NULL);
1389 list.head->header.next = *pp;
1395 /* Check if all sections in a wild statement for a particular FILE
1399 check_section_callback (lang_wild_statement_type *ptr ATTRIBUTE_UNUSED,
1400 struct wildcard_list *sec ATTRIBUTE_UNUSED,
1402 lang_input_statement_type *file ATTRIBUTE_UNUSED,
1405 /* Exclude sections that match UNIQUE_SECTION_LIST. */
1406 if (unique_section_p (section))
1409 if (section->output_section == NULL)
1411 flagword flags = bfd_get_section_flags (section->owner, section);
1413 if ((flags & SEC_READONLY) == 0)
1414 ((lang_output_section_statement_type *) output)->all_input_readonly
1419 /* This is passed a file name which must have been seen already and
1420 added to the statement tree. We will see if it has been opened
1421 already and had its symbols read. If not then we'll read it. */
1423 static lang_input_statement_type *
1424 lookup_name (const char *name)
1426 lang_input_statement_type *search;
1428 for (search = (lang_input_statement_type *) input_file_chain.head;
1430 search = (lang_input_statement_type *) search->next_real_file)
1432 /* Use the local_sym_name as the name of the file that has
1433 already been loaded as filename might have been transformed
1434 via the search directory lookup mechanism. */
1435 const char * filename = search->local_sym_name;
1437 if (filename == NULL && name == NULL)
1439 if (filename != NULL
1441 && strcmp (filename, name) == 0)
1446 search = new_afile (name, lang_input_file_is_search_file_enum, default_target,
1449 /* If we have already added this file, or this file is not real
1450 (FIXME: can that ever actually happen?) or the name is NULL
1451 (FIXME: can that ever actually happen?) don't add this file. */
1454 || search->filename == NULL)
1457 if (! load_symbols (search, NULL))
1463 /* Get the symbols for an input file. */
1466 load_symbols (lang_input_statement_type *entry,
1467 lang_statement_list_type *place)
1474 ldfile_open_file (entry);
1476 if (! bfd_check_format (entry->the_bfd, bfd_archive)
1477 && ! bfd_check_format_matches (entry->the_bfd, bfd_object, &matching))
1480 lang_statement_list_type *hold;
1481 bfd_boolean bad_load = TRUE;
1482 bfd_boolean save_ldlang_sysrooted_script;
1484 err = bfd_get_error ();
1486 /* See if the emulation has some special knowledge. */
1487 if (ldemul_unrecognized_file (entry))
1490 if (err == bfd_error_file_ambiguously_recognized)
1494 einfo (_("%B: file not recognized: %E\n"), entry->the_bfd);
1495 einfo (_("%B: matching formats:"), entry->the_bfd);
1496 for (p = matching; *p != NULL; p++)
1500 else if (err != bfd_error_file_not_recognized
1502 einfo (_("%F%B: file not recognized: %E\n"), entry->the_bfd);
1506 bfd_close (entry->the_bfd);
1507 entry->the_bfd = NULL;
1509 /* Try to interpret the file as a linker script. */
1510 ldfile_open_command_file (entry->filename);
1514 save_ldlang_sysrooted_script = ldlang_sysrooted_script;
1515 ldlang_sysrooted_script = entry->sysrooted;
1517 ldfile_assumed_script = TRUE;
1518 parser_input = input_script;
1520 ldfile_assumed_script = FALSE;
1522 ldlang_sysrooted_script = save_ldlang_sysrooted_script;
1528 if (ldemul_recognized_file (entry))
1531 /* We don't call ldlang_add_file for an archive. Instead, the
1532 add_symbols entry point will call ldlang_add_file, via the
1533 add_archive_element callback, for each element of the archive
1535 switch (bfd_get_format (entry->the_bfd))
1541 ldlang_add_file (entry);
1542 if (trace_files || trace_file_tries)
1543 info_msg ("%I\n", entry);
1547 if (entry->whole_archive)
1550 bfd_boolean loaded = TRUE;
1554 member = bfd_openr_next_archived_file (entry->the_bfd, member);
1559 if (! bfd_check_format (member, bfd_object))
1561 einfo (_("%F%B: member %B in archive is not an object\n"),
1562 entry->the_bfd, member);
1566 if (! ((*link_info.callbacks->add_archive_element)
1567 (&link_info, member, "--whole-archive")))
1570 if (! bfd_link_add_symbols (member, &link_info))
1572 einfo (_("%F%B: could not read symbols: %E\n"), member);
1577 entry->loaded = loaded;
1583 if (bfd_link_add_symbols (entry->the_bfd, &link_info))
1584 entry->loaded = TRUE;
1586 einfo (_("%F%B: could not read symbols: %E\n"), entry->the_bfd);
1588 return entry->loaded;
1591 /* Handle a wild statement. S->FILENAME or S->SECTION_LIST or both
1592 may be NULL, indicating that it is a wildcard. Separate
1593 lang_input_section statements are created for each part of the
1594 expansion; they are added after the wild statement S. OUTPUT is
1595 the output section. */
1598 wild (lang_wild_statement_type *s,
1599 const char *target ATTRIBUTE_UNUSED,
1600 lang_output_section_statement_type *output)
1602 struct wildcard_list *sec;
1604 walk_wild (s, output_section_callback, output);
1606 for (sec = s->section_list; sec != NULL; sec = sec->next)
1608 if (default_common_section != NULL)
1610 if (sec->spec.name != NULL && strcmp (sec->spec.name, "COMMON") == 0)
1612 /* Remember the section that common is going to in case we
1613 later get something which doesn't know where to put it. */
1614 default_common_section = output;
1619 /* Return TRUE iff target is the sought target. */
1622 get_target (const bfd_target *target, void *data)
1624 const char *sought = data;
1626 return strcmp (target->name, sought) == 0;
1629 /* Like strcpy() but convert to lower case as well. */
1632 stricpy (char *dest, char *src)
1636 while ((c = *src++) != 0)
1637 *dest++ = TOLOWER (c);
1642 /* Remove the first occurrence of needle (if any) in haystack
1646 strcut (char *haystack, char *needle)
1648 haystack = strstr (haystack, needle);
1654 for (src = haystack + strlen (needle); *src;)
1655 *haystack++ = *src++;
1661 /* Compare two target format name strings.
1662 Return a value indicating how "similar" they are. */
1665 name_compare (char *first, char *second)
1671 copy1 = xmalloc (strlen (first) + 1);
1672 copy2 = xmalloc (strlen (second) + 1);
1674 /* Convert the names to lower case. */
1675 stricpy (copy1, first);
1676 stricpy (copy2, second);
1678 /* Remove size and endian strings from the name. */
1679 strcut (copy1, "big");
1680 strcut (copy1, "little");
1681 strcut (copy2, "big");
1682 strcut (copy2, "little");
1684 /* Return a value based on how many characters match,
1685 starting from the beginning. If both strings are
1686 the same then return 10 * their length. */
1687 for (result = 0; copy1[result] == copy2[result]; result++)
1688 if (copy1[result] == 0)
1700 /* Set by closest_target_match() below. */
1701 static const bfd_target *winner;
1703 /* Scan all the valid bfd targets looking for one that has the endianness
1704 requirement that was specified on the command line, and is the nearest
1705 match to the original output target. */
1708 closest_target_match (const bfd_target *target, void *data)
1710 const bfd_target *original = data;
1712 if (command_line.endian == ENDIAN_BIG
1713 && target->byteorder != BFD_ENDIAN_BIG)
1716 if (command_line.endian == ENDIAN_LITTLE
1717 && target->byteorder != BFD_ENDIAN_LITTLE)
1720 /* Must be the same flavour. */
1721 if (target->flavour != original->flavour)
1724 /* If we have not found a potential winner yet, then record this one. */
1731 /* Oh dear, we now have two potential candidates for a successful match.
1732 Compare their names and choose the better one. */
1733 if (name_compare (target->name, original->name)
1734 > name_compare (winner->name, original->name))
1737 /* Keep on searching until wqe have checked them all. */
1741 /* Return the BFD target format of the first input file. */
1744 get_first_input_target (void)
1746 char *target = NULL;
1748 LANG_FOR_EACH_INPUT_STATEMENT (s)
1750 if (s->header.type == lang_input_statement_enum
1753 ldfile_open_file (s);
1755 if (s->the_bfd != NULL
1756 && bfd_check_format (s->the_bfd, bfd_object))
1758 target = bfd_get_target (s->the_bfd);
1770 lang_get_output_target (void)
1774 /* Has the user told us which output format to use? */
1775 if (output_target != NULL)
1776 return output_target;
1778 /* No - has the current target been set to something other than
1780 if (current_target != default_target)
1781 return current_target;
1783 /* No - can we determine the format of the first input file? */
1784 target = get_first_input_target ();
1788 /* Failed - use the default output target. */
1789 return default_target;
1792 /* Open the output file. */
1795 open_output (const char *name)
1799 output_target = lang_get_output_target ();
1801 /* Has the user requested a particular endianness on the command
1803 if (command_line.endian != ENDIAN_UNSET)
1805 const bfd_target *target;
1806 enum bfd_endian desired_endian;
1808 /* Get the chosen target. */
1809 target = bfd_search_for_target (get_target, (void *) output_target);
1811 /* If the target is not supported, we cannot do anything. */
1814 if (command_line.endian == ENDIAN_BIG)
1815 desired_endian = BFD_ENDIAN_BIG;
1817 desired_endian = BFD_ENDIAN_LITTLE;
1819 /* See if the target has the wrong endianness. This should
1820 not happen if the linker script has provided big and
1821 little endian alternatives, but some scrips don't do
1823 if (target->byteorder != desired_endian)
1825 /* If it does, then see if the target provides
1826 an alternative with the correct endianness. */
1827 if (target->alternative_target != NULL
1828 && (target->alternative_target->byteorder == desired_endian))
1829 output_target = target->alternative_target->name;
1832 /* Try to find a target as similar as possible to
1833 the default target, but which has the desired
1834 endian characteristic. */
1835 bfd_search_for_target (closest_target_match,
1838 /* Oh dear - we could not find any targets that
1839 satisfy our requirements. */
1841 einfo (_("%P: warning: could not find any targets that match endianness requirement\n"));
1843 output_target = winner->name;
1849 output = bfd_openw (name, output_target);
1853 if (bfd_get_error () == bfd_error_invalid_target)
1854 einfo (_("%P%F: target %s not found\n"), output_target);
1856 einfo (_("%P%F: cannot open output file %s: %E\n"), name);
1859 delete_output_file_on_failure = TRUE;
1862 output->flags |= D_PAGED;
1865 if (! bfd_set_format (output, bfd_object))
1866 einfo (_("%P%F:%s: can not make object file: %E\n"), name);
1867 if (! bfd_set_arch_mach (output,
1868 ldfile_output_architecture,
1869 ldfile_output_machine))
1870 einfo (_("%P%F:%s: can not set architecture: %E\n"), name);
1872 link_info.hash = bfd_link_hash_table_create (output);
1873 if (link_info.hash == NULL)
1874 einfo (_("%P%F: can not create link hash table: %E\n"));
1876 bfd_set_gp_size (output, g_switch_value);
1881 ldlang_open_output (lang_statement_union_type *statement)
1883 switch (statement->header.type)
1885 case lang_output_statement_enum:
1886 ASSERT (output_bfd == NULL);
1887 output_bfd = open_output (statement->output_statement.name);
1888 ldemul_set_output_arch ();
1889 if (config.magic_demand_paged && !link_info.relocatable)
1890 output_bfd->flags |= D_PAGED;
1892 output_bfd->flags &= ~D_PAGED;
1893 if (config.text_read_only)
1894 output_bfd->flags |= WP_TEXT;
1896 output_bfd->flags &= ~WP_TEXT;
1897 if (link_info.traditional_format)
1898 output_bfd->flags |= BFD_TRADITIONAL_FORMAT;
1900 output_bfd->flags &= ~BFD_TRADITIONAL_FORMAT;
1903 case lang_target_statement_enum:
1904 current_target = statement->target_statement.target;
1911 /* Convert between addresses in bytes and sizes in octets.
1912 For currently supported targets, octets_per_byte is always a power
1913 of two, so we can use shifts. */
1914 #define TO_ADDR(X) ((X) >> opb_shift)
1915 #define TO_SIZE(X) ((X) << opb_shift)
1917 /* Support the above. */
1918 static unsigned int opb_shift = 0;
1923 unsigned x = bfd_arch_mach_octets_per_byte (ldfile_output_architecture,
1924 ldfile_output_machine);
1927 while ((x & 1) == 0)
1935 /* Open all the input files. */
1938 open_input_bfds (lang_statement_union_type *s, bfd_boolean force)
1940 for (; s != NULL; s = s->header.next)
1942 switch (s->header.type)
1944 case lang_constructors_statement_enum:
1945 open_input_bfds (constructor_list.head, force);
1947 case lang_output_section_statement_enum:
1948 open_input_bfds (s->output_section_statement.children.head, force);
1950 case lang_wild_statement_enum:
1951 /* Maybe we should load the file's symbols. */
1952 if (s->wild_statement.filename
1953 && ! wildcardp (s->wild_statement.filename))
1954 lookup_name (s->wild_statement.filename);
1955 open_input_bfds (s->wild_statement.children.head, force);
1957 case lang_group_statement_enum:
1959 struct bfd_link_hash_entry *undefs;
1961 /* We must continually search the entries in the group
1962 until no new symbols are added to the list of undefined
1967 undefs = link_info.hash->undefs_tail;
1968 open_input_bfds (s->group_statement.children.head, TRUE);
1970 while (undefs != link_info.hash->undefs_tail);
1973 case lang_target_statement_enum:
1974 current_target = s->target_statement.target;
1976 case lang_input_statement_enum:
1977 if (s->input_statement.real)
1979 lang_statement_list_type add;
1981 s->input_statement.target = current_target;
1983 /* If we are being called from within a group, and this
1984 is an archive which has already been searched, then
1985 force it to be researched unless the whole archive
1986 has been loaded already. */
1988 && !s->input_statement.whole_archive
1989 && s->input_statement.loaded
1990 && bfd_check_format (s->input_statement.the_bfd,
1992 s->input_statement.loaded = FALSE;
1994 lang_list_init (&add);
1996 if (! load_symbols (&s->input_statement, &add))
1997 config.make_executable = FALSE;
1999 if (add.head != NULL)
2001 *add.tail = s->header.next;
2002 s->header.next = add.head;
2012 /* If there are [COMMONS] statements, put a wild one into the bss
2016 lang_reasonable_defaults (void)
2019 lang_output_section_statement_lookup (".text");
2020 lang_output_section_statement_lookup (".data");
2022 default_common_section = lang_output_section_statement_lookup (".bss");
2024 if (!placed_commons)
2026 lang_wild_statement_type *new =
2027 new_stat (lang_wild_statement,
2028 &default_common_section->children);
2030 new->section_name = "COMMON";
2031 new->filename = NULL;
2032 lang_list_init (&new->children);
2037 /* Add a symbol to a hash of symbols used in DEFINED (NAME) expressions. */
2040 lang_track_definedness (const char *name)
2042 if (bfd_hash_lookup (&lang_definedness_table, name, TRUE, FALSE) == NULL)
2043 einfo (_("%P%F: bfd_hash_lookup failed creating symbol %s\n"), name);
2046 /* New-function for the definedness hash table. */
2048 static struct bfd_hash_entry *
2049 lang_definedness_newfunc (struct bfd_hash_entry *entry,
2050 struct bfd_hash_table *table ATTRIBUTE_UNUSED,
2051 const char *name ATTRIBUTE_UNUSED)
2053 struct lang_definedness_hash_entry *ret
2054 = (struct lang_definedness_hash_entry *) entry;
2057 ret = (struct lang_definedness_hash_entry *)
2058 bfd_hash_allocate (table, sizeof (struct lang_definedness_hash_entry));
2061 einfo (_("%P%F: bfd_hash_allocate failed creating symbol %s\n"), name);
2063 ret->iteration = -1;
2067 /* Return the iteration when the definition of NAME was last updated. A
2068 value of -1 means that the symbol is not defined in the linker script
2069 or the command line, but may be defined in the linker symbol table. */
2072 lang_symbol_definition_iteration (const char *name)
2074 struct lang_definedness_hash_entry *defentry
2075 = (struct lang_definedness_hash_entry *)
2076 bfd_hash_lookup (&lang_definedness_table, name, FALSE, FALSE);
2078 /* We've already created this one on the presence of DEFINED in the
2079 script, so it can't be NULL unless something is borked elsewhere in
2081 if (defentry == NULL)
2084 return defentry->iteration;
2087 /* Update the definedness state of NAME. */
2090 lang_update_definedness (const char *name, struct bfd_link_hash_entry *h)
2092 struct lang_definedness_hash_entry *defentry
2093 = (struct lang_definedness_hash_entry *)
2094 bfd_hash_lookup (&lang_definedness_table, name, FALSE, FALSE);
2096 /* We don't keep track of symbols not tested with DEFINED. */
2097 if (defentry == NULL)
2100 /* If the symbol was already defined, and not from an earlier statement
2101 iteration, don't update the definedness iteration, because that'd
2102 make the symbol seem defined in the linker script at this point, and
2103 it wasn't; it was defined in some object. If we do anyway, DEFINED
2104 would start to yield false before this point and the construct "sym =
2105 DEFINED (sym) ? sym : X;" would change sym to X despite being defined
2107 if (h->type != bfd_link_hash_undefined
2108 && h->type != bfd_link_hash_common
2109 && h->type != bfd_link_hash_new
2110 && defentry->iteration == -1)
2113 defentry->iteration = lang_statement_iteration;
2116 /* Add the supplied name to the symbol table as an undefined reference.
2117 This is a two step process as the symbol table doesn't even exist at
2118 the time the ld command line is processed. First we put the name
2119 on a list, then, once the output file has been opened, transfer the
2120 name to the symbol table. */
2122 typedef struct bfd_sym_chain ldlang_undef_chain_list_type;
2124 #define ldlang_undef_chain_list_head entry_symbol.next
2127 ldlang_add_undef (const char *const name)
2129 ldlang_undef_chain_list_type *new =
2130 stat_alloc (sizeof (ldlang_undef_chain_list_type));
2132 new->next = ldlang_undef_chain_list_head;
2133 ldlang_undef_chain_list_head = new;
2135 new->name = xstrdup (name);
2137 if (output_bfd != NULL)
2138 insert_undefined (new->name);
2141 /* Insert NAME as undefined in the symbol table. */
2144 insert_undefined (const char *name)
2146 struct bfd_link_hash_entry *h;
2148 h = bfd_link_hash_lookup (link_info.hash, name, TRUE, FALSE, TRUE);
2150 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
2151 if (h->type == bfd_link_hash_new)
2153 h->type = bfd_link_hash_undefined;
2154 h->u.undef.abfd = NULL;
2155 bfd_link_add_undef (link_info.hash, h);
2159 /* Run through the list of undefineds created above and place them
2160 into the linker hash table as undefined symbols belonging to the
2164 lang_place_undefineds (void)
2166 ldlang_undef_chain_list_type *ptr;
2168 for (ptr = ldlang_undef_chain_list_head; ptr != NULL; ptr = ptr->next)
2169 insert_undefined (ptr->name);
2172 /* Check for all readonly or some readwrite sections. */
2175 check_input_sections (lang_statement_union_type *s,
2176 lang_output_section_statement_type *output_section_statement)
2178 for (; s != (lang_statement_union_type *) NULL; s = s->header.next)
2180 switch (s->header.type)
2182 case lang_wild_statement_enum:
2183 walk_wild (&s->wild_statement, check_section_callback,
2184 output_section_statement);
2185 if (! output_section_statement->all_input_readonly)
2188 case lang_constructors_statement_enum:
2189 check_input_sections (constructor_list.head,
2190 output_section_statement);
2191 if (! output_section_statement->all_input_readonly)
2194 case lang_group_statement_enum:
2195 check_input_sections (s->group_statement.children.head,
2196 output_section_statement);
2197 if (! output_section_statement->all_input_readonly)
2206 /* Open input files and attach to output sections. */
2209 map_input_to_output_sections
2210 (lang_statement_union_type *s, const char *target,
2211 lang_output_section_statement_type *output_section_statement)
2213 for (; s != NULL; s = s->header.next)
2215 switch (s->header.type)
2217 case lang_wild_statement_enum:
2218 wild (&s->wild_statement, target, output_section_statement);
2220 case lang_constructors_statement_enum:
2221 map_input_to_output_sections (constructor_list.head,
2223 output_section_statement);
2225 case lang_output_section_statement_enum:
2226 if (s->output_section_statement.constraint)
2228 if (s->output_section_statement.constraint == -1)
2230 s->output_section_statement.all_input_readonly = TRUE;
2231 check_input_sections (s->output_section_statement.children.head,
2232 &s->output_section_statement);
2233 if ((s->output_section_statement.all_input_readonly
2234 && s->output_section_statement.constraint == ONLY_IF_RW)
2235 || (!s->output_section_statement.all_input_readonly
2236 && s->output_section_statement.constraint == ONLY_IF_RO))
2238 s->output_section_statement.constraint = -1;
2243 map_input_to_output_sections (s->output_section_statement.children.head,
2245 &s->output_section_statement);
2247 case lang_output_statement_enum:
2249 case lang_target_statement_enum:
2250 target = s->target_statement.target;
2252 case lang_group_statement_enum:
2253 map_input_to_output_sections (s->group_statement.children.head,
2255 output_section_statement);
2257 case lang_data_statement_enum:
2258 /* Make sure that any sections mentioned in the expression
2260 exp_init_os (s->data_statement.exp);
2262 case lang_fill_statement_enum:
2263 case lang_input_section_enum:
2264 case lang_object_symbols_statement_enum:
2265 case lang_reloc_statement_enum:
2266 case lang_padding_statement_enum:
2267 case lang_input_statement_enum:
2268 if (output_section_statement != NULL
2269 && output_section_statement->bfd_section == NULL)
2270 init_os (output_section_statement);
2272 case lang_assignment_statement_enum:
2273 if (output_section_statement != NULL
2274 && output_section_statement->bfd_section == NULL)
2275 init_os (output_section_statement);
2277 /* Make sure that any sections mentioned in the assignment
2279 exp_init_os (s->assignment_statement.exp);
2281 case lang_afile_asection_pair_statement_enum:
2284 case lang_address_statement_enum:
2285 /* Mark the specified section with the supplied address. */
2287 lang_output_section_statement_type *os =
2288 lang_output_section_statement_lookup
2289 (s->address_statement.section_name);
2291 if (os->bfd_section == NULL)
2293 os->addr_tree = s->address_statement.address;
2300 /* An output section might have been removed after its statement was
2301 added. For example, ldemul_before_allocation can remove dynamic
2302 sections if they turn out to be not needed. Clean them up here. */
2305 strip_excluded_output_sections (void)
2307 lang_statement_union_type *u;
2309 for (u = lang_output_section_statement.head;
2311 u = u->output_section_statement.next)
2313 lang_output_section_statement_type *os;
2316 os = &u->output_section_statement;
2317 if (os->constraint == -1)
2319 s = os->bfd_section;
2320 if (s != NULL && (s->flags & SEC_EXCLUDE) != 0)
2324 os->bfd_section = NULL;
2326 for (p = &output_bfd->sections; *p; p = &(*p)->next)
2329 bfd_section_list_remove (output_bfd, p);
2330 output_bfd->section_count--;
2338 print_output_section_statement
2339 (lang_output_section_statement_type *output_section_statement)
2341 asection *section = output_section_statement->bfd_section;
2344 if (output_section_statement != abs_output_section)
2346 minfo ("\n%s", output_section_statement->name);
2348 if (section != NULL)
2350 print_dot = section->vma;
2352 len = strlen (output_section_statement->name);
2353 if (len >= SECTION_NAME_MAP_LENGTH - 1)
2358 while (len < SECTION_NAME_MAP_LENGTH)
2364 minfo ("0x%V %W", section->vma, section->_raw_size);
2366 if (output_section_statement->load_base != NULL)
2370 addr = exp_get_abs_int (output_section_statement->load_base, 0,
2371 "load base", lang_final_phase_enum);
2372 minfo (_(" load address 0x%V"), addr);
2379 print_statement_list (output_section_statement->children.head,
2380 output_section_statement);
2384 print_assignment (lang_assignment_statement_type *assignment,
2385 lang_output_section_statement_type *output_section)
2388 etree_value_type result;
2390 for (i = 0; i < SECTION_NAME_MAP_LENGTH; i++)
2393 result = exp_fold_tree (assignment->exp->assign.src, output_section,
2394 lang_final_phase_enum, print_dot, &print_dot);
2400 value = result.value + result.section->bfd_section->vma;
2401 dst = assignment->exp->assign.dst;
2403 minfo ("0x%V", value);
2404 if (dst[0] == '.' && dst[1] == 0)
2417 exp_print_tree (assignment->exp);
2423 print_input_statement (lang_input_statement_type *statm)
2425 if (statm->filename != NULL)
2427 fprintf (config.map_file, "LOAD %s\n", statm->filename);
2431 /* Print all symbols defined in a particular section. This is called
2432 via bfd_link_hash_traverse, or by print_all_symbols. */
2435 print_one_symbol (struct bfd_link_hash_entry *hash_entry, void *ptr)
2437 asection *sec = ptr;
2439 if ((hash_entry->type == bfd_link_hash_defined
2440 || hash_entry->type == bfd_link_hash_defweak)
2441 && sec == hash_entry->u.def.section)
2445 for (i = 0; i < SECTION_NAME_MAP_LENGTH; i++)
2448 (hash_entry->u.def.value
2449 + hash_entry->u.def.section->output_offset
2450 + hash_entry->u.def.section->output_section->vma));
2452 minfo (" %T\n", hash_entry->root.string);
2459 print_all_symbols (sec)
2462 struct fat_user_section_struct *ud = get_userdata (sec);
2463 struct map_symbol_def *def;
2465 *ud->map_symbol_def_tail = 0;
2466 for (def = ud->map_symbol_def_head; def; def = def->next)
2467 print_one_symbol (def->entry, sec);
2470 /* Print information about an input section to the map file. */
2473 print_input_section (lang_input_section_type *in)
2475 asection *i = in->section;
2476 bfd_size_type size = i->_cooked_size != 0 ? i->_cooked_size : i->_raw_size;
2485 minfo ("%s", i->name);
2487 len = 1 + strlen (i->name);
2488 if (len >= SECTION_NAME_MAP_LENGTH - 1)
2493 while (len < SECTION_NAME_MAP_LENGTH)
2499 if (i->output_section != NULL && (i->flags & SEC_EXCLUDE) == 0)
2500 addr = i->output_section->vma + i->output_offset;
2507 minfo ("0x%V %W %B\n", addr, TO_ADDR (size), i->owner);
2509 if (size != i->_raw_size)
2511 len = SECTION_NAME_MAP_LENGTH + 3;
2523 minfo (_("%W (size before relaxing)\n"), i->_raw_size);
2526 if (i->output_section != NULL && (i->flags & SEC_EXCLUDE) == 0)
2528 if (command_line.reduce_memory_overheads)
2529 bfd_link_hash_traverse (link_info.hash, print_one_symbol, i);
2531 print_all_symbols (i);
2533 print_dot = addr + TO_ADDR (size);
2539 print_fill_statement (lang_fill_statement_type *fill)
2543 fputs (" FILL mask 0x", config.map_file);
2544 for (p = fill->fill->data, size = fill->fill->size; size != 0; p++, size--)
2545 fprintf (config.map_file, "%02x", *p);
2546 fputs ("\n", config.map_file);
2550 print_data_statement (lang_data_statement_type *data)
2558 for (i = 0; i < SECTION_NAME_MAP_LENGTH; i++)
2561 addr = data->output_vma;
2562 if (data->output_section != NULL)
2563 addr += data->output_section->vma;
2591 minfo ("0x%V %W %s 0x%v", addr, size, name, data->value);
2593 if (data->exp->type.node_class != etree_value)
2596 exp_print_tree (data->exp);
2601 print_dot = addr + TO_ADDR (size);
2604 /* Print an address statement. These are generated by options like
2608 print_address_statement (lang_address_statement_type *address)
2610 minfo (_("Address of section %s set to "), address->section_name);
2611 exp_print_tree (address->address);
2615 /* Print a reloc statement. */
2618 print_reloc_statement (lang_reloc_statement_type *reloc)
2625 for (i = 0; i < SECTION_NAME_MAP_LENGTH; i++)
2628 addr = reloc->output_vma;
2629 if (reloc->output_section != NULL)
2630 addr += reloc->output_section->vma;
2632 size = bfd_get_reloc_size (reloc->howto);
2634 minfo ("0x%V %W RELOC %s ", addr, size, reloc->howto->name);
2636 if (reloc->name != NULL)
2637 minfo ("%s+", reloc->name);
2639 minfo ("%s+", reloc->section->name);
2641 exp_print_tree (reloc->addend_exp);
2645 print_dot = addr + TO_ADDR (size);
2649 print_padding_statement (lang_padding_statement_type *s)
2657 len = sizeof " *fill*" - 1;
2658 while (len < SECTION_NAME_MAP_LENGTH)
2664 addr = s->output_offset;
2665 if (s->output_section != NULL)
2666 addr += s->output_section->vma;
2667 minfo ("0x%V %W ", addr, (bfd_vma) s->size);
2669 if (s->fill->size != 0)
2673 for (p = s->fill->data, size = s->fill->size; size != 0; p++, size--)
2674 fprintf (config.map_file, "%02x", *p);
2679 print_dot = addr + TO_ADDR (s->size);
2683 print_wild_statement (lang_wild_statement_type *w,
2684 lang_output_section_statement_type *os)
2686 struct wildcard_list *sec;
2690 if (w->filenames_sorted)
2692 if (w->filename != NULL)
2693 minfo ("%s", w->filename);
2696 if (w->filenames_sorted)
2700 for (sec = w->section_list; sec; sec = sec->next)
2702 if (sec->spec.sorted)
2704 if (sec->spec.exclude_name_list != NULL)
2707 minfo ("EXCLUDE_FILE(%s", sec->spec.exclude_name_list->name);
2708 for (tmp = sec->spec.exclude_name_list->next; tmp; tmp = tmp->next)
2709 minfo (" %s", tmp->name);
2712 if (sec->spec.name != NULL)
2713 minfo ("%s", sec->spec.name);
2716 if (sec->spec.sorted)
2725 print_statement_list (w->children.head, os);
2728 /* Print a group statement. */
2731 print_group (lang_group_statement_type *s,
2732 lang_output_section_statement_type *os)
2734 fprintf (config.map_file, "START GROUP\n");
2735 print_statement_list (s->children.head, os);
2736 fprintf (config.map_file, "END GROUP\n");
2739 /* Print the list of statements in S.
2740 This can be called for any statement type. */
2743 print_statement_list (lang_statement_union_type *s,
2744 lang_output_section_statement_type *os)
2748 print_statement (s, os);
2753 /* Print the first statement in statement list S.
2754 This can be called for any statement type. */
2757 print_statement (lang_statement_union_type *s,
2758 lang_output_section_statement_type *os)
2760 switch (s->header.type)
2763 fprintf (config.map_file, _("Fail with %d\n"), s->header.type);
2766 case lang_constructors_statement_enum:
2767 if (constructor_list.head != NULL)
2769 if (constructors_sorted)
2770 minfo (" SORT (CONSTRUCTORS)\n");
2772 minfo (" CONSTRUCTORS\n");
2773 print_statement_list (constructor_list.head, os);
2776 case lang_wild_statement_enum:
2777 print_wild_statement (&s->wild_statement, os);
2779 case lang_address_statement_enum:
2780 print_address_statement (&s->address_statement);
2782 case lang_object_symbols_statement_enum:
2783 minfo (" CREATE_OBJECT_SYMBOLS\n");
2785 case lang_fill_statement_enum:
2786 print_fill_statement (&s->fill_statement);
2788 case lang_data_statement_enum:
2789 print_data_statement (&s->data_statement);
2791 case lang_reloc_statement_enum:
2792 print_reloc_statement (&s->reloc_statement);
2794 case lang_input_section_enum:
2795 print_input_section (&s->input_section);
2797 case lang_padding_statement_enum:
2798 print_padding_statement (&s->padding_statement);
2800 case lang_output_section_statement_enum:
2801 print_output_section_statement (&s->output_section_statement);
2803 case lang_assignment_statement_enum:
2804 print_assignment (&s->assignment_statement, os);
2806 case lang_target_statement_enum:
2807 fprintf (config.map_file, "TARGET(%s)\n", s->target_statement.target);
2809 case lang_output_statement_enum:
2810 minfo ("OUTPUT(%s", s->output_statement.name);
2811 if (output_target != NULL)
2812 minfo (" %s", output_target);
2815 case lang_input_statement_enum:
2816 print_input_statement (&s->input_statement);
2818 case lang_group_statement_enum:
2819 print_group (&s->group_statement, os);
2821 case lang_afile_asection_pair_statement_enum:
2828 print_statements (void)
2830 print_statement_list (statement_list.head, abs_output_section);
2833 /* Print the first N statements in statement list S to STDERR.
2834 If N == 0, nothing is printed.
2835 If N < 0, the entire list is printed.
2836 Intended to be called from GDB. */
2839 dprint_statement (lang_statement_union_type *s, int n)
2841 FILE *map_save = config.map_file;
2843 config.map_file = stderr;
2846 print_statement_list (s, abs_output_section);
2849 while (s && --n >= 0)
2851 print_statement (s, abs_output_section);
2856 config.map_file = map_save;
2860 insert_pad (lang_statement_union_type **ptr,
2862 unsigned int alignment_needed,
2863 asection *output_section,
2866 static fill_type zero_fill = { 1, { 0 } };
2867 lang_statement_union_type *pad;
2869 pad = ((lang_statement_union_type *)
2870 ((char *) ptr - offsetof (lang_statement_union_type, header.next)));
2871 if (ptr != &statement_list.head
2872 && pad->header.type == lang_padding_statement_enum
2873 && pad->padding_statement.output_section == output_section)
2875 /* Use the existing pad statement. The above test on output
2876 section is probably redundant, but it doesn't hurt to check. */
2880 /* Make a new padding statement, linked into existing chain. */
2881 pad = stat_alloc (sizeof (lang_padding_statement_type));
2882 pad->header.next = *ptr;
2884 pad->header.type = lang_padding_statement_enum;
2885 pad->padding_statement.output_section = output_section;
2888 pad->padding_statement.fill = fill;
2890 pad->padding_statement.output_offset = dot - output_section->vma;
2891 pad->padding_statement.size = alignment_needed;
2892 output_section->_raw_size += alignment_needed;
2895 /* Work out how much this section will move the dot point. */
2898 size_input_section (lang_statement_union_type **this_ptr,
2899 lang_output_section_statement_type *output_section_statement,
2903 lang_input_section_type *is = &((*this_ptr)->input_section);
2904 asection *i = is->section;
2906 if (!is->ifile->just_syms_flag && (i->flags & SEC_EXCLUDE) == 0)
2908 unsigned int alignment_needed;
2911 /* Align this section first to the input sections requirement,
2912 then to the output section's requirement. If this alignment
2913 is greater than any seen before, then record it too. Perform
2914 the alignment by inserting a magic 'padding' statement. */
2916 if (output_section_statement->subsection_alignment != -1)
2917 i->alignment_power = output_section_statement->subsection_alignment;
2919 o = output_section_statement->bfd_section;
2920 if (o->alignment_power < i->alignment_power)
2921 o->alignment_power = i->alignment_power;
2923 alignment_needed = align_power (dot, i->alignment_power) - dot;
2925 if (alignment_needed != 0)
2927 insert_pad (this_ptr, fill, TO_SIZE (alignment_needed), o, dot);
2928 dot += alignment_needed;
2931 /* Remember where in the output section this input section goes. */
2933 i->output_offset = dot - o->vma;
2935 /* Mark how big the output section must be to contain this now. */
2936 if (i->_cooked_size != 0)
2937 dot += TO_ADDR (i->_cooked_size);
2939 dot += TO_ADDR (i->_raw_size);
2940 o->_raw_size = TO_SIZE (dot - o->vma);
2944 i->output_offset = i->vma - output_section_statement->bfd_section->vma;
2950 #define IGNORE_SECTION(bfd, s) \
2951 (((bfd_get_section_flags (bfd, s) & SEC_THREAD_LOCAL) \
2952 ? ((bfd_get_section_flags (bfd, s) & (SEC_LOAD | SEC_NEVER_LOAD)) \
2954 : ((bfd_get_section_flags (bfd, s) & (SEC_ALLOC | SEC_NEVER_LOAD)) \
2956 || bfd_section_size (bfd, s) == 0)
2958 /* Check to see if any allocated sections overlap with other allocated
2959 sections. This can happen when the linker script specifically specifies
2960 the output section addresses of the two sections. */
2963 lang_check_section_addresses (void)
2967 /* Scan all sections in the output list. */
2968 for (s = output_bfd->sections; s != NULL; s = s->next)
2972 /* Ignore sections which are not loaded or which have no contents. */
2973 if (IGNORE_SECTION (output_bfd, s))
2976 /* Once we reach section 's' stop our seach. This prevents two
2977 warning messages from being produced, one for 'section A overlaps
2978 section B' and one for 'section B overlaps section A'. */
2979 for (os = output_bfd->sections; os != s; os = os->next)
2986 /* Only consider loadable sections with real contents. */
2987 if (IGNORE_SECTION (output_bfd, os))
2990 /* We must check the sections' LMA addresses not their
2991 VMA addresses because overlay sections can have
2992 overlapping VMAs but they must have distinct LMAs. */
2993 s_start = bfd_section_lma (output_bfd, s);
2994 os_start = bfd_section_lma (output_bfd, os);
2995 s_end = s_start + TO_ADDR (bfd_section_size (output_bfd, s)) - 1;
2996 os_end = os_start + TO_ADDR (bfd_section_size (output_bfd, os)) - 1;
2998 /* Look for an overlap. */
2999 if ((s_end < os_start) || (s_start > os_end))
3003 _("%X%P: section %s [%V -> %V] overlaps section %s [%V -> %V]\n"),
3004 s->name, s_start, s_end, os->name, os_start, os_end);
3006 /* Once we have found one overlap for this section,
3007 stop looking for others. */
3013 /* Make sure the new address is within the region. We explicitly permit the
3014 current address to be at the exact end of the region when the address is
3015 non-zero, in case the region is at the end of addressable memory and the
3016 calculation wraps around. */
3019 os_region_check (lang_output_section_statement_type *os,
3020 lang_memory_region_type *region,
3024 if ((region->current < region->origin
3025 || (region->current - region->origin > region->length))
3026 && ((region->current != region->origin + region->length)
3031 einfo (_("%X%P: address 0x%v of %B section %s is not within region %s\n"),
3033 os->bfd_section->owner,
3034 os->bfd_section->name,
3039 einfo (_("%X%P: region %s is full (%B section %s)\n"),
3041 os->bfd_section->owner,
3042 os->bfd_section->name);
3044 /* Reset the region pointer. */
3045 region->current = region->origin;
3049 /* Set the sizes for all the output sections. */
3052 lang_size_sections_1
3053 (lang_statement_union_type *s,
3054 lang_output_section_statement_type *output_section_statement,
3055 lang_statement_union_type **prev,
3059 bfd_boolean check_regions)
3061 /* Size up the sections from their constituent parts. */
3062 for (; s != NULL; s = s->header.next)
3064 switch (s->header.type)
3066 case lang_output_section_statement_enum:
3069 lang_output_section_statement_type *os;
3071 os = &s->output_section_statement;
3072 if (os->bfd_section == NULL)
3073 /* This section was never actually created. */
3076 /* If this is a COFF shared library section, use the size and
3077 address from the input section. FIXME: This is COFF
3078 specific; it would be cleaner if there were some other way
3079 to do this, but nothing simple comes to mind. */
3080 if ((os->bfd_section->flags & SEC_COFF_SHARED_LIBRARY) != 0)
3084 if (os->children.head == NULL
3085 || os->children.head->header.next != NULL
3086 || os->children.head->header.type != lang_input_section_enum)
3087 einfo (_("%P%X: Internal error on COFF shared library section %s\n"),
3090 input = os->children.head->input_section.section;
3091 bfd_set_section_vma (os->bfd_section->owner,
3093 bfd_section_vma (input->owner, input));
3094 os->bfd_section->_raw_size = input->_raw_size;
3098 if (bfd_is_abs_section (os->bfd_section))
3100 /* No matter what happens, an abs section starts at zero. */
3101 ASSERT (os->bfd_section->vma == 0);
3105 if (os->addr_tree == NULL)
3107 /* No address specified for this section, get one
3108 from the region specification. */
3109 if (os->region == NULL
3110 || (((bfd_get_section_flags (output_bfd, os->bfd_section)
3111 & (SEC_ALLOC | SEC_LOAD)) != 0)
3112 && os->region->name[0] == '*'
3113 && strcmp (os->region->name, DEFAULT_MEMORY_REGION) == 0))
3115 os->region = lang_memory_default (os->bfd_section);
3118 /* If a loadable section is using the default memory
3119 region, and some non default memory regions were
3120 defined, issue an error message. */
3121 if (!IGNORE_SECTION (output_bfd, os->bfd_section)
3122 && ! link_info.relocatable
3124 && strcmp (os->region->name, DEFAULT_MEMORY_REGION) == 0
3125 && lang_memory_region_list != NULL
3126 && (strcmp (lang_memory_region_list->name,
3127 DEFAULT_MEMORY_REGION) != 0
3128 || lang_memory_region_list->next != NULL))
3130 /* By default this is an error rather than just a
3131 warning because if we allocate the section to the
3132 default memory region we can end up creating an
3133 excessively large binary, or even seg faulting when
3134 attempting to perform a negative seek. See
3135 http://sources.redhat.com/ml/binutils/2003-04/msg00423.html
3136 for an example of this. This behaviour can be
3137 overridden by the using the --no-check-sections
3139 if (command_line.check_section_addresses)
3140 einfo (_("%P%F: error: no memory region specified for loadable section `%s'\n"),
3141 bfd_get_section_name (output_bfd,
3144 einfo (_("%P: warning: no memory region specified for loadable section `%s'\n"),
3145 bfd_get_section_name (output_bfd,
3149 dot = os->region->current;
3151 if (os->section_alignment == -1)
3156 dot = align_power (dot,
3157 os->bfd_section->alignment_power);
3159 if (dot != olddot && config.warn_section_align)
3160 einfo (_("%P: warning: changing start of section %s by %u bytes\n"),
3161 os->name, (unsigned int) (dot - olddot));
3169 r = exp_fold_tree (os->addr_tree,
3171 lang_allocating_phase_enum,
3176 einfo (_("%F%S: non constant or forward reference address expression for section %s\n"),
3179 dot = r.value + r.section->bfd_section->vma;
3182 /* The section starts here.
3183 First, align to what the section needs. */
3185 if (os->section_alignment != -1)
3186 dot = align_power (dot, os->section_alignment);
3188 bfd_set_section_vma (0, os->bfd_section, dot);
3190 os->bfd_section->output_offset = 0;
3193 lang_size_sections_1 (os->children.head, os, &os->children.head,
3194 os->fill, dot, relax, check_regions);
3196 /* Put the section within the requested block size, or
3197 align at the block boundary. */
3198 after = ((os->bfd_section->vma
3199 + TO_ADDR (os->bfd_section->_raw_size)
3200 + os->block_value - 1)
3201 & - (bfd_vma) os->block_value);
3203 if (bfd_is_abs_section (os->bfd_section))
3204 ASSERT (after == os->bfd_section->vma);
3206 os->bfd_section->_raw_size
3207 = TO_SIZE (after - os->bfd_section->vma);
3209 dot = os->bfd_section->vma;
3210 /* .tbss sections effectively have zero size. */
3211 if ((os->bfd_section->flags & SEC_HAS_CONTENTS) != 0
3212 || (os->bfd_section->flags & SEC_THREAD_LOCAL) == 0
3213 || link_info.relocatable)
3214 dot += TO_ADDR (os->bfd_section->_raw_size);
3218 if (os->update_dot_tree != 0)
3219 exp_fold_tree (os->update_dot_tree, abs_output_section,
3220 lang_allocating_phase_enum, dot, &dot);
3222 /* Update dot in the region ?
3223 We only do this if the section is going to be allocated,
3224 since unallocated sections do not contribute to the region's
3225 overall size in memory.
3227 If the SEC_NEVER_LOAD bit is not set, it will affect the
3228 addresses of sections after it. We have to update
3230 if (os->region != NULL
3231 && ((bfd_get_section_flags (output_bfd, os->bfd_section)
3232 & SEC_NEVER_LOAD) == 0
3233 || (bfd_get_section_flags (output_bfd, os->bfd_section)
3234 & (SEC_ALLOC | SEC_LOAD))))
3236 os->region->current = dot;
3239 /* Make sure the new address is within the region. */
3240 os_region_check (os, os->region, os->addr_tree,
3241 os->bfd_section->vma);
3243 /* If there's no load address specified, use the run
3244 region as the load region. */
3245 if (os->lma_region == NULL && os->load_base == NULL)
3246 os->lma_region = os->region;
3248 if (os->lma_region != NULL && os->lma_region != os->region)
3250 /* Set load_base, which will be handled later. */
3251 os->load_base = exp_intop (os->lma_region->current);
3252 os->lma_region->current +=
3253 TO_ADDR (os->bfd_section->_raw_size);
3255 os_region_check (os, os->lma_region, NULL,
3256 os->bfd_section->lma);
3262 case lang_constructors_statement_enum:
3263 dot = lang_size_sections_1 (constructor_list.head,
3264 output_section_statement,
3265 &s->wild_statement.children.head,
3266 fill, dot, relax, check_regions);
3269 case lang_data_statement_enum:
3271 unsigned int size = 0;
3273 s->data_statement.output_vma =
3274 dot - output_section_statement->bfd_section->vma;
3275 s->data_statement.output_section =
3276 output_section_statement->bfd_section;
3278 /* We might refer to provided symbols in the expression, and
3279 need to mark them as needed. */
3280 exp_fold_tree (s->data_statement.exp, abs_output_section,
3281 lang_allocating_phase_enum, dot, &dot);
3283 switch (s->data_statement.type)
3301 if (size < TO_SIZE ((unsigned) 1))
3302 size = TO_SIZE ((unsigned) 1);
3303 dot += TO_ADDR (size);
3304 output_section_statement->bfd_section->_raw_size += size;
3305 /* The output section gets contents, and then we inspect for
3306 any flags set in the input script which override any ALLOC. */
3307 output_section_statement->bfd_section->flags |= SEC_HAS_CONTENTS;
3308 if (!(output_section_statement->flags & SEC_NEVER_LOAD))
3310 output_section_statement->bfd_section->flags |=
3311 SEC_ALLOC | SEC_LOAD;
3316 case lang_reloc_statement_enum:
3320 s->reloc_statement.output_vma =
3321 dot - output_section_statement->bfd_section->vma;
3322 s->reloc_statement.output_section =
3323 output_section_statement->bfd_section;
3324 size = bfd_get_reloc_size (s->reloc_statement.howto);
3325 dot += TO_ADDR (size);
3326 output_section_statement->bfd_section->_raw_size += size;
3330 case lang_wild_statement_enum:
3332 dot = lang_size_sections_1 (s->wild_statement.children.head,
3333 output_section_statement,
3334 &s->wild_statement.children.head,
3335 fill, dot, relax, check_regions);
3339 case lang_object_symbols_statement_enum:
3340 link_info.create_object_symbols_section =
3341 output_section_statement->bfd_section;
3343 case lang_output_statement_enum:
3344 case lang_target_statement_enum:
3346 case lang_input_section_enum:
3350 i = (*prev)->input_section.section;
3353 if (i->_cooked_size == 0)
3354 i->_cooked_size = i->_raw_size;
3360 if (! bfd_relax_section (i->owner, i, &link_info, &again))
3361 einfo (_("%P%F: can't relax section: %E\n"));
3365 dot = size_input_section (prev, output_section_statement,
3366 output_section_statement->fill, dot);
3369 case lang_input_statement_enum:
3371 case lang_fill_statement_enum:
3372 s->fill_statement.output_section =
3373 output_section_statement->bfd_section;
3375 fill = s->fill_statement.fill;
3377 case lang_assignment_statement_enum:
3379 bfd_vma newdot = dot;
3381 exp_fold_tree (s->assignment_statement.exp,
3382 output_section_statement,
3383 lang_allocating_phase_enum,
3389 if (output_section_statement == abs_output_section)
3391 /* If we don't have an output section, then just adjust
3392 the default memory address. */
3393 lang_memory_region_lookup (DEFAULT_MEMORY_REGION, FALSE)->current = newdot;
3397 /* Insert a pad after this statement. We can't
3398 put the pad before when relaxing, in case the
3399 assignment references dot. */
3400 insert_pad (&s->header.next, fill, TO_SIZE (newdot - dot),
3401 output_section_statement->bfd_section, dot);
3403 /* Don't neuter the pad below when relaxing. */
3407 /* If dot is advanced, this implies that the section should
3408 have space allocated to it, unless the user has explicitly
3409 stated that the section should never be loaded. */
3410 if (!(output_section_statement->flags & (SEC_NEVER_LOAD | SEC_ALLOC)))
3411 output_section_statement->bfd_section->flags |= SEC_ALLOC;
3418 case lang_padding_statement_enum:
3419 /* If this is the first time lang_size_sections is called,
3420 we won't have any padding statements. If this is the
3421 second or later passes when relaxing, we should allow
3422 padding to shrink. If padding is needed on this pass, it
3423 will be added back in. */
3424 s->padding_statement.size = 0;
3426 /* Make sure output_offset is valid. If relaxation shrinks
3427 the section and this pad isn't needed, it's possible to
3428 have output_offset larger than the final size of the
3429 section. bfd_set_section_contents will complain even for
3430 a pad size of zero. */
3431 s->padding_statement.output_offset
3432 = dot - output_section_statement->bfd_section->vma;
3435 case lang_group_statement_enum:
3436 dot = lang_size_sections_1 (s->group_statement.children.head,
3437 output_section_statement,
3438 &s->group_statement.children.head,
3439 fill, dot, relax, check_regions);
3446 /* We can only get here when relaxing is turned on. */
3447 case lang_address_statement_enum:
3450 prev = &s->header.next;
3457 (lang_statement_union_type *s,
3458 lang_output_section_statement_type *output_section_statement,
3459 lang_statement_union_type **prev,
3463 bfd_boolean check_regions)
3468 /* Callers of exp_fold_tree need to increment this. */
3469 lang_statement_iteration++;
3471 exp_data_seg.phase = exp_dataseg_none;
3472 result = lang_size_sections_1 (s, output_section_statement, prev, fill,
3473 dot, relax, check_regions);
3474 if (exp_data_seg.phase == exp_dataseg_end_seen
3475 && link_info.relro && exp_data_seg.relro_end)
3477 /* If DATA_SEGMENT_ALIGN DATA_SEGMENT_RELRO_END pair was seen, try
3478 to put exp_data_seg.relro on a (common) page boundary. */
3480 exp_data_seg.phase = exp_dataseg_relro_adjust;
3481 result = lang_size_sections_1 (s, output_section_statement, prev, fill,
3482 dot, relax, check_regions);
3483 link_info.relro_start = exp_data_seg.base;
3484 link_info.relro_end = exp_data_seg.relro_end;
3486 else if (exp_data_seg.phase == exp_dataseg_end_seen)
3488 /* If DATA_SEGMENT_ALIGN DATA_SEGMENT_END pair was seen, check whether
3489 a page could be saved in the data segment. */
3490 bfd_vma first, last;
3492 first = -exp_data_seg.base & (exp_data_seg.pagesize - 1);
3493 last = exp_data_seg.end & (exp_data_seg.pagesize - 1);
3495 && ((exp_data_seg.base & ~(exp_data_seg.pagesize - 1))
3496 != (exp_data_seg.end & ~(exp_data_seg.pagesize - 1)))
3497 && first + last <= exp_data_seg.pagesize)
3499 exp_data_seg.phase = exp_dataseg_adjust;
3500 lang_statement_iteration++;
3501 result = lang_size_sections_1 (s, output_section_statement, prev,
3502 fill, dot, relax, check_regions);
3506 /* Some backend relaxers want to refer to the output section size. Give
3507 them a section size that does not change on the next call while they
3508 relax. We can't set this at top because lang_reset_memory_regions
3509 which is called before we get here, sets _raw_size to 0 on relaxing
3511 for (o = output_bfd->sections; o != NULL; o = o->next)
3512 o->_cooked_size = o->_raw_size;
3517 /* Worker function for lang_do_assignments. Recursiveness goes here. */
3520 lang_do_assignments_1
3521 (lang_statement_union_type *s,
3522 lang_output_section_statement_type *output_section_statement,
3526 for (; s != NULL; s = s->header.next)
3528 switch (s->header.type)
3530 case lang_constructors_statement_enum:
3531 dot = lang_do_assignments_1 (constructor_list.head,
3532 output_section_statement,
3537 case lang_output_section_statement_enum:
3539 lang_output_section_statement_type *os;
3541 os = &(s->output_section_statement);
3542 if (os->bfd_section != NULL)
3544 dot = os->bfd_section->vma;
3545 lang_do_assignments_1 (os->children.head, os, os->fill, dot);
3546 /* .tbss sections effectively have zero size. */
3547 if ((os->bfd_section->flags & SEC_HAS_CONTENTS) != 0
3548 || (os->bfd_section->flags & SEC_THREAD_LOCAL) == 0
3549 || link_info.relocatable)
3550 dot += TO_ADDR (os->bfd_section->_raw_size);
3554 /* If nothing has been placed into the output section then
3555 it won't have a bfd_section. */
3556 if (os->bfd_section)
3558 os->bfd_section->lma
3559 = exp_get_abs_int (os->load_base, 0, "load base",
3560 lang_final_phase_enum);
3565 case lang_wild_statement_enum:
3567 dot = lang_do_assignments_1 (s->wild_statement.children.head,
3568 output_section_statement,
3573 case lang_object_symbols_statement_enum:
3574 case lang_output_statement_enum:
3575 case lang_target_statement_enum:
3577 case lang_common_statement_enum:
3580 case lang_data_statement_enum:
3582 etree_value_type value;
3584 value = exp_fold_tree (s->data_statement.exp,
3586 lang_final_phase_enum, dot, &dot);
3588 einfo (_("%F%P: invalid data statement\n"));
3589 s->data_statement.value
3590 = value.value + value.section->bfd_section->vma;
3594 switch (s->data_statement.type)
3612 if (size < TO_SIZE ((unsigned) 1))
3613 size = TO_SIZE ((unsigned) 1);
3614 dot += TO_ADDR (size);
3618 case lang_reloc_statement_enum:
3620 etree_value_type value;
3622 value = exp_fold_tree (s->reloc_statement.addend_exp,
3624 lang_final_phase_enum, dot, &dot);
3625 s->reloc_statement.addend_value = value.value;
3627 einfo (_("%F%P: invalid reloc statement\n"));
3629 dot += TO_ADDR (bfd_get_reloc_size (s->reloc_statement.howto));
3632 case lang_input_section_enum:
3634 asection *in = s->input_section.section;
3636 if ((in->flags & SEC_EXCLUDE) == 0)
3638 if (in->_cooked_size != 0)
3639 dot += TO_ADDR (in->_cooked_size);
3641 dot += TO_ADDR (in->_raw_size);
3646 case lang_input_statement_enum:
3648 case lang_fill_statement_enum:
3649 fill = s->fill_statement.fill;
3651 case lang_assignment_statement_enum:
3653 exp_fold_tree (s->assignment_statement.exp,
3654 output_section_statement,
3655 lang_final_phase_enum,
3661 case lang_padding_statement_enum:
3662 dot += TO_ADDR (s->padding_statement.size);
3665 case lang_group_statement_enum:
3666 dot = lang_do_assignments_1 (s->group_statement.children.head,
3667 output_section_statement,
3675 case lang_address_statement_enum:
3684 lang_do_assignments (lang_statement_union_type *s,
3685 lang_output_section_statement_type *output_section_statement,
3689 /* Callers of exp_fold_tree need to increment this. */
3690 lang_statement_iteration++;
3691 lang_do_assignments_1 (s, output_section_statement, fill, dot);
3694 /* Fix any .startof. or .sizeof. symbols. When the assemblers see the
3695 operator .startof. (section_name), it produces an undefined symbol
3696 .startof.section_name. Similarly, when it sees
3697 .sizeof. (section_name), it produces an undefined symbol
3698 .sizeof.section_name. For all the output sections, we look for
3699 such symbols, and set them to the correct value. */
3702 lang_set_startof (void)
3706 if (link_info.relocatable)
3709 for (s = output_bfd->sections; s != NULL; s = s->next)
3711 const char *secname;
3713 struct bfd_link_hash_entry *h;
3715 secname = bfd_get_section_name (output_bfd, s);
3716 buf = xmalloc (10 + strlen (secname));
3718 sprintf (buf, ".startof.%s", secname);
3719 h = bfd_link_hash_lookup (link_info.hash, buf, FALSE, FALSE, TRUE);
3720 if (h != NULL && h->type == bfd_link_hash_undefined)
3722 h->type = bfd_link_hash_defined;
3723 h->u.def.value = bfd_get_section_vma (output_bfd, s);
3724 h->u.def.section = bfd_abs_section_ptr;
3727 sprintf (buf, ".sizeof.%s", secname);
3728 h = bfd_link_hash_lookup (link_info.hash, buf, FALSE, FALSE, TRUE);
3729 if (h != NULL && h->type == bfd_link_hash_undefined)
3731 h->type = bfd_link_hash_defined;
3732 if (s->_cooked_size != 0)
3733 h->u.def.value = TO_ADDR (s->_cooked_size);
3735 h->u.def.value = TO_ADDR (s->_raw_size);
3736 h->u.def.section = bfd_abs_section_ptr;
3746 struct bfd_link_hash_entry *h;
3749 if (link_info.relocatable || link_info.shared)
3754 if (entry_symbol.name == NULL)
3756 /* No entry has been specified. Look for start, but don't warn
3757 if we don't find it. */
3758 entry_symbol.name = "start";
3762 h = bfd_link_hash_lookup (link_info.hash, entry_symbol.name,
3763 FALSE, FALSE, TRUE);
3765 && (h->type == bfd_link_hash_defined
3766 || h->type == bfd_link_hash_defweak)
3767 && h->u.def.section->output_section != NULL)
3771 val = (h->u.def.value
3772 + bfd_get_section_vma (output_bfd,
3773 h->u.def.section->output_section)
3774 + h->u.def.section->output_offset);
3775 if (! bfd_set_start_address (output_bfd, val))
3776 einfo (_("%P%F:%s: can't set start address\n"), entry_symbol.name);
3783 /* We couldn't find the entry symbol. Try parsing it as a
3785 val = bfd_scan_vma (entry_symbol.name, &send, 0);
3788 if (! bfd_set_start_address (output_bfd, val))
3789 einfo (_("%P%F: can't set start address\n"));
3795 /* Can't find the entry symbol, and it's not a number. Use
3796 the first address in the text section. */
3797 ts = bfd_get_section_by_name (output_bfd, entry_section);
3801 einfo (_("%P: warning: cannot find entry symbol %s; defaulting to %V\n"),
3803 bfd_get_section_vma (output_bfd, ts));
3804 if (! bfd_set_start_address (output_bfd,
3805 bfd_get_section_vma (output_bfd,
3807 einfo (_("%P%F: can't set start address\n"));
3812 einfo (_("%P: warning: cannot find entry symbol %s; not setting start address\n"),
3818 bfd_hash_table_free (&lang_definedness_table);
3821 /* This is a small function used when we want to ignore errors from
3825 ignore_bfd_errors (const char *s ATTRIBUTE_UNUSED, ...)
3827 /* Don't do anything. */
3830 /* Check that the architecture of all the input files is compatible
3831 with the output file. Also call the backend to let it do any
3832 other checking that is needed. */
3837 lang_statement_union_type *file;
3839 const bfd_arch_info_type *compatible;
3841 for (file = file_chain.head; file != NULL; file = file->input_statement.next)
3843 input_bfd = file->input_statement.the_bfd;
3844 compatible = bfd_arch_get_compatible (input_bfd, output_bfd,
3845 command_line.accept_unknown_input_arch);
3847 /* In general it is not possible to perform a relocatable
3848 link between differing object formats when the input
3849 file has relocations, because the relocations in the
3850 input format may not have equivalent representations in
3851 the output format (and besides BFD does not translate
3852 relocs for other link purposes than a final link). */
3853 if ((link_info.relocatable || link_info.emitrelocations)
3854 && (compatible == NULL
3855 || bfd_get_flavour (input_bfd) != bfd_get_flavour (output_bfd))
3856 && (bfd_get_file_flags (input_bfd) & HAS_RELOC) != 0)
3858 einfo (_("%P%F: Relocatable linking with relocations from format %s (%B) to format %s (%B) is not supported\n"),
3859 bfd_get_target (input_bfd), input_bfd,
3860 bfd_get_target (output_bfd), output_bfd);
3861 /* einfo with %F exits. */
3864 if (compatible == NULL)
3866 if (command_line.warn_mismatch)
3867 einfo (_("%P: warning: %s architecture of input file `%B' is incompatible with %s output\n"),
3868 bfd_printable_name (input_bfd), input_bfd,
3869 bfd_printable_name (output_bfd));
3871 else if (bfd_count_sections (input_bfd))
3873 /* If the input bfd has no contents, it shouldn't set the
3874 private data of the output bfd. */
3876 bfd_error_handler_type pfn = NULL;
3878 /* If we aren't supposed to warn about mismatched input
3879 files, temporarily set the BFD error handler to a
3880 function which will do nothing. We still want to call
3881 bfd_merge_private_bfd_data, since it may set up
3882 information which is needed in the output file. */
3883 if (! command_line.warn_mismatch)
3884 pfn = bfd_set_error_handler (ignore_bfd_errors);
3885 if (! bfd_merge_private_bfd_data (input_bfd, output_bfd))
3887 if (command_line.warn_mismatch)
3888 einfo (_("%P%X: failed to merge target specific data of file %B\n"),
3891 if (! command_line.warn_mismatch)
3892 bfd_set_error_handler (pfn);
3897 /* Look through all the global common symbols and attach them to the
3898 correct section. The -sort-common command line switch may be used
3899 to roughly sort the entries by size. */
3904 if (command_line.inhibit_common_definition)
3906 if (link_info.relocatable
3907 && ! command_line.force_common_definition)
3910 if (! config.sort_common)
3911 bfd_link_hash_traverse (link_info.hash, lang_one_common, NULL);
3916 for (power = 4; power >= 0; power--)
3917 bfd_link_hash_traverse (link_info.hash, lang_one_common, &power);
3921 /* Place one common symbol in the correct section. */
3924 lang_one_common (struct bfd_link_hash_entry *h, void *info)
3926 unsigned int power_of_two;
3930 if (h->type != bfd_link_hash_common)
3934 power_of_two = h->u.c.p->alignment_power;
3936 if (config.sort_common
3937 && power_of_two < (unsigned int) *(int *) info)
3940 section = h->u.c.p->section;
3942 /* Increase the size of the section to align the common sym. */
3943 section->_cooked_size += ((bfd_vma) 1 << (power_of_two + opb_shift)) - 1;
3944 section->_cooked_size &= (- (bfd_vma) 1 << (power_of_two + opb_shift));
3946 /* Adjust the alignment if necessary. */
3947 if (power_of_two > section->alignment_power)
3948 section->alignment_power = power_of_two;
3950 /* Change the symbol from common to defined. */
3951 h->type = bfd_link_hash_defined;
3952 h->u.def.section = section;
3953 h->u.def.value = section->_cooked_size;
3955 /* Increase the size of the section. */
3956 section->_cooked_size += size;
3958 /* Make sure the section is allocated in memory, and make sure that
3959 it is no longer a common section. */
3960 section->flags |= SEC_ALLOC;
3961 section->flags &= ~SEC_IS_COMMON;
3963 if (config.map_file != NULL)
3965 static bfd_boolean header_printed;
3970 if (! header_printed)
3972 minfo (_("\nAllocating common symbols\n"));
3973 minfo (_("Common symbol size file\n\n"));
3974 header_printed = TRUE;
3977 name = demangle (h->root.string);
3979 len = strlen (name);
3994 if (size <= 0xffffffff)
3995 sprintf (buf, "%lx", (unsigned long) size);
3997 sprintf_vma (buf, size);
4007 minfo ("%B\n", section->owner);
4013 /* Run through the input files and ensure that every input section has
4014 somewhere to go. If one is found without a destination then create
4015 an input request and place it into the statement tree. */
4018 lang_place_orphans (void)
4020 LANG_FOR_EACH_INPUT_STATEMENT (file)
4024 for (s = file->the_bfd->sections; s != NULL; s = s->next)
4026 if (s->output_section == NULL)
4028 /* This section of the file is not attached, root
4029 around for a sensible place for it to go. */
4031 if (file->just_syms_flag)
4035 else if (strcmp (s->name, "COMMON") == 0)
4037 /* This is a lonely common section which must have
4038 come from an archive. We attach to the section
4039 with the wildcard. */
4040 if (! link_info.relocatable
4041 || command_line.force_common_definition)
4043 if (default_common_section == NULL)
4046 /* This message happens when using the
4047 svr3.ifile linker script, so I have
4049 info_msg (_("%P: no [COMMON] command, defaulting to .bss\n"));
4051 default_common_section =
4052 lang_output_section_statement_lookup (".bss");
4055 lang_add_section (&default_common_section->children, s,
4056 default_common_section, file);
4059 else if (ldemul_place_orphan (file, s))
4063 lang_output_section_statement_type *os;
4065 os = lang_output_section_statement_lookup (s->name);
4066 lang_add_section (&os->children, s, os, file);
4074 lang_set_flags (lang_memory_region_type *ptr, const char *flags, int invert)
4076 flagword *ptr_flags;
4078 ptr_flags = invert ? &ptr->not_flags : &ptr->flags;
4084 *ptr_flags |= SEC_ALLOC;
4088 *ptr_flags |= SEC_READONLY;
4092 *ptr_flags |= SEC_DATA;
4096 *ptr_flags |= SEC_CODE;
4101 *ptr_flags |= SEC_LOAD;
4105 einfo (_("%P%F: invalid syntax in flags\n"));
4112 /* Call a function on each input file. This function will be called
4113 on an archive, but not on the elements. */
4116 lang_for_each_input_file (void (*func) (lang_input_statement_type *))
4118 lang_input_statement_type *f;
4120 for (f = (lang_input_statement_type *) input_file_chain.head;
4122 f = (lang_input_statement_type *) f->next_real_file)
4126 /* Call a function on each file. The function will be called on all
4127 the elements of an archive which are included in the link, but will
4128 not be called on the archive file itself. */
4131 lang_for_each_file (void (*func) (lang_input_statement_type *))
4133 LANG_FOR_EACH_INPUT_STATEMENT (f)
4140 ldlang_add_file (lang_input_statement_type *entry)
4144 lang_statement_append (&file_chain,
4145 (lang_statement_union_type *) entry,
4148 /* The BFD linker needs to have a list of all input BFDs involved in
4150 ASSERT (entry->the_bfd->link_next == NULL);
4151 ASSERT (entry->the_bfd != output_bfd);
4152 for (pp = &link_info.input_bfds; *pp != NULL; pp = &(*pp)->link_next)
4154 *pp = entry->the_bfd;
4155 entry->the_bfd->usrdata = entry;
4156 bfd_set_gp_size (entry->the_bfd, g_switch_value);
4158 /* Look through the sections and check for any which should not be
4159 included in the link. We need to do this now, so that we can
4160 notice when the backend linker tries to report multiple
4161 definition errors for symbols which are in sections we aren't
4162 going to link. FIXME: It might be better to entirely ignore
4163 symbols which are defined in sections which are going to be
4164 discarded. This would require modifying the backend linker for
4165 each backend which might set the SEC_LINK_ONCE flag. If we do
4166 this, we should probably handle SEC_EXCLUDE in the same way. */
4168 bfd_map_over_sections (entry->the_bfd, section_already_linked, entry);
4172 lang_add_output (const char *name, int from_script)
4174 /* Make -o on command line override OUTPUT in script. */
4175 if (!had_output_filename || !from_script)
4177 output_filename = name;
4178 had_output_filename = TRUE;
4182 static lang_output_section_statement_type *current_section;
4193 for (l = 0; l < 32; l++)
4195 if (i >= (unsigned int) x)
4203 lang_output_section_statement_type *
4204 lang_enter_output_section_statement (const char *output_section_statement_name,
4205 etree_type *address_exp,
4206 enum section_type sectype,
4208 etree_type *subalign,
4212 lang_output_section_statement_type *os;
4216 lang_output_section_statement_lookup_1 (output_section_statement_name,
4219 /* Add this statement to tree. */
4221 add_statement (lang_output_section_statement_enum,
4222 output_section_statement);
4224 /* Make next things chain into subchain of this. */
4226 if (os->addr_tree == NULL)
4228 os->addr_tree = address_exp;
4230 os->sectype = sectype;
4231 if (sectype != noload_section)
4232 os->flags = SEC_NO_FLAGS;
4234 os->flags = SEC_NEVER_LOAD;
4235 os->block_value = 1;
4236 stat_ptr = &os->children;
4238 os->subsection_alignment =
4239 topower (exp_get_value_int (subalign, -1, "subsection alignment", 0));
4240 os->section_alignment =
4241 topower (exp_get_value_int (align, -1, "section alignment", 0));
4243 os->load_base = ebase;
4250 lang_output_statement_type *new =
4251 new_stat (lang_output_statement, stat_ptr);
4253 new->name = output_filename;
4256 /* Reset the current counters in the regions. */
4259 lang_reset_memory_regions (void)
4261 lang_memory_region_type *p = lang_memory_region_list;
4264 for (p = lang_memory_region_list; p != NULL; p = p->next)
4266 p->old_length = (bfd_size_type) (p->current - p->origin);
4267 p->current = p->origin;
4270 for (o = output_bfd->sections; o != NULL; o = o->next)
4274 /* If the wild pattern was marked KEEP, the member sections
4275 should be as well. */
4278 gc_section_callback (lang_wild_statement_type *ptr,
4279 struct wildcard_list *sec ATTRIBUTE_UNUSED,
4281 lang_input_statement_type *file ATTRIBUTE_UNUSED,
4282 void *data ATTRIBUTE_UNUSED)
4284 if (ptr->keep_sections)
4285 section->flags |= SEC_KEEP;
4288 /* Handle a wild statement, marking it against GC. */
4291 lang_gc_wild (lang_wild_statement_type *s)
4293 walk_wild (s, gc_section_callback, NULL);
4296 /* Iterate over sections marking them against GC. */
4299 lang_gc_sections_1 (lang_statement_union_type *s)
4301 for (; s != NULL; s = s->header.next)
4303 switch (s->header.type)
4305 case lang_wild_statement_enum:
4306 lang_gc_wild (&s->wild_statement);
4308 case lang_constructors_statement_enum:
4309 lang_gc_sections_1 (constructor_list.head);
4311 case lang_output_section_statement_enum:
4312 lang_gc_sections_1 (s->output_section_statement.children.head);
4314 case lang_group_statement_enum:
4315 lang_gc_sections_1 (s->group_statement.children.head);
4324 lang_gc_sections (void)
4326 struct bfd_link_hash_entry *h;
4327 ldlang_undef_chain_list_type *ulist;
4329 /* Keep all sections so marked in the link script. */
4331 lang_gc_sections_1 (statement_list.head);
4333 /* Keep all sections containing symbols undefined on the command-line,
4334 and the section containing the entry symbol. */
4336 for (ulist = link_info.gc_sym_list; ulist; ulist = ulist->next)
4338 h = bfd_link_hash_lookup (link_info.hash, ulist->name,
4339 FALSE, FALSE, FALSE);
4342 && (h->type == bfd_link_hash_defined
4343 || h->type == bfd_link_hash_defweak)
4344 && ! bfd_is_abs_section (h->u.def.section))
4346 h->u.def.section->flags |= SEC_KEEP;
4350 bfd_gc_sections (output_bfd, &link_info);
4356 lang_reasonable_defaults ();
4357 current_target = default_target;
4359 /* Open the output file. */
4360 lang_for_each_statement (ldlang_open_output);
4363 ldemul_create_output_section_statements ();
4365 /* Add to the hash table all undefineds on the command line. */
4366 lang_place_undefineds ();
4368 already_linked_table_init ();
4370 /* Create a bfd for each input file. */
4371 current_target = default_target;
4372 open_input_bfds (statement_list.head, FALSE);
4374 link_info.gc_sym_list = &entry_symbol;
4375 if (entry_symbol.name == NULL)
4376 link_info.gc_sym_list = ldlang_undef_chain_list_head;
4378 ldemul_after_open ();
4380 already_linked_table_free ();
4382 /* Make sure that we're not mixing architectures. We call this
4383 after all the input files have been opened, but before we do any
4384 other processing, so that any operations merge_private_bfd_data
4385 does on the output file will be known during the rest of the
4389 /* Handle .exports instead of a version script if we're told to do so. */
4390 if (command_line.version_exports_section)
4391 lang_do_version_exports_section ();
4393 /* Build all sets based on the information gathered from the input
4395 ldctor_build_sets ();
4397 /* Remove unreferenced sections if asked to. */
4398 if (command_line.gc_sections)
4399 lang_gc_sections ();
4401 /* Size up the common data. */
4404 /* Run through the contours of the script and attach input sections
4405 to the correct output sections. */
4406 map_input_to_output_sections (statement_list.head, NULL, NULL);
4408 /* Find any sections not attached explicitly and handle them. */
4409 lang_place_orphans ();
4411 if (! link_info.relocatable)
4415 /* Merge SEC_MERGE sections. This has to be done after GC of
4416 sections, so that GCed sections are not merged, but before
4417 assigning dynamic symbols, since removing whole input sections
4419 bfd_merge_sections (output_bfd, &link_info);
4421 /* Look for a text section and set the readonly attribute in it. */
4422 found = bfd_get_section_by_name (output_bfd, ".text");
4426 if (config.text_read_only)
4427 found->flags |= SEC_READONLY;
4429 found->flags &= ~SEC_READONLY;
4433 /* Do anything special before sizing sections. This is where ELF
4434 and other back-ends size dynamic sections. */
4435 ldemul_before_allocation ();
4437 if (!link_info.relocatable)
4438 strip_excluded_output_sections ();
4440 /* We must record the program headers before we try to fix the
4441 section positions, since they will affect SIZEOF_HEADERS. */
4442 lang_record_phdrs ();
4444 /* Size up the sections. */
4445 lang_size_sections (statement_list.head, abs_output_section,
4446 &statement_list.head, 0, 0, NULL,
4447 command_line.relax ? FALSE : TRUE);
4449 /* Now run around and relax if we can. */
4450 if (command_line.relax)
4452 /* Keep relaxing until bfd_relax_section gives up. */
4453 bfd_boolean relax_again;
4457 relax_again = FALSE;
4459 /* Note: pe-dll.c does something like this also. If you find
4460 you need to change this code, you probably need to change
4461 pe-dll.c also. DJ */
4463 /* Do all the assignments with our current guesses as to
4465 lang_do_assignments (statement_list.head, abs_output_section,
4468 /* We must do this after lang_do_assignments, because it uses
4470 lang_reset_memory_regions ();
4472 /* Perform another relax pass - this time we know where the
4473 globals are, so can make a better guess. */
4474 lang_size_sections (statement_list.head, abs_output_section,
4475 &statement_list.head, 0, 0, &relax_again, FALSE);
4477 /* If the normal relax is done and the relax finalize pass
4478 is not performed yet, we perform another relax pass. */
4479 if (!relax_again && link_info.need_relax_finalize)
4481 link_info.need_relax_finalize = FALSE;
4485 while (relax_again);
4487 /* Final extra sizing to report errors. */
4488 lang_do_assignments (statement_list.head, abs_output_section, NULL, 0);
4489 lang_reset_memory_regions ();
4490 lang_size_sections (statement_list.head, abs_output_section,
4491 &statement_list.head, 0, 0, NULL, TRUE);
4494 /* See if anything special should be done now we know how big
4496 ldemul_after_allocation ();
4498 /* Fix any .startof. or .sizeof. symbols. */
4499 lang_set_startof ();
4501 /* Do all the assignments, now that we know the final resting places
4502 of all the symbols. */
4504 lang_do_assignments (statement_list.head, abs_output_section, NULL, 0);
4506 /* Make sure that the section addresses make sense. */
4507 if (! link_info.relocatable
4508 && command_line.check_section_addresses)
4509 lang_check_section_addresses ();
4517 /* EXPORTED TO YACC */
4520 lang_add_wild (struct wildcard_spec *filespec,
4521 struct wildcard_list *section_list,
4522 bfd_boolean keep_sections)
4524 struct wildcard_list *curr, *next;
4525 lang_wild_statement_type *new;
4527 /* Reverse the list as the parser puts it back to front. */
4528 for (curr = section_list, section_list = NULL;
4530 section_list = curr, curr = next)
4532 if (curr->spec.name != NULL && strcmp (curr->spec.name, "COMMON") == 0)
4533 placed_commons = TRUE;
4536 curr->next = section_list;
4539 if (filespec != NULL && filespec->name != NULL)
4541 if (strcmp (filespec->name, "*") == 0)
4542 filespec->name = NULL;
4543 else if (! wildcardp (filespec->name))
4544 lang_has_input_file = TRUE;
4547 new = new_stat (lang_wild_statement, stat_ptr);
4548 new->filename = NULL;
4549 new->filenames_sorted = FALSE;
4550 if (filespec != NULL)
4552 new->filename = filespec->name;
4553 new->filenames_sorted = filespec->sorted;
4555 new->section_list = section_list;
4556 new->keep_sections = keep_sections;
4557 lang_list_init (&new->children);
4561 lang_section_start (const char *name, etree_type *address)
4563 lang_address_statement_type *ad;
4565 ad = new_stat (lang_address_statement, stat_ptr);
4566 ad->section_name = name;
4567 ad->address = address;
4570 /* Set the start symbol to NAME. CMDLINE is nonzero if this is called
4571 because of a -e argument on the command line, or zero if this is
4572 called by ENTRY in a linker script. Command line arguments take
4576 lang_add_entry (const char *name, bfd_boolean cmdline)
4578 if (entry_symbol.name == NULL
4580 || ! entry_from_cmdline)
4582 entry_symbol.name = name;
4583 entry_from_cmdline = cmdline;
4588 lang_add_target (const char *name)
4590 lang_target_statement_type *new = new_stat (lang_target_statement,
4598 lang_add_map (const char *name)
4605 map_option_f = TRUE;
4613 lang_add_fill (fill_type *fill)
4615 lang_fill_statement_type *new = new_stat (lang_fill_statement,
4622 lang_add_data (int type, union etree_union *exp)
4625 lang_data_statement_type *new = new_stat (lang_data_statement,
4633 /* Create a new reloc statement. RELOC is the BFD relocation type to
4634 generate. HOWTO is the corresponding howto structure (we could
4635 look this up, but the caller has already done so). SECTION is the
4636 section to generate a reloc against, or NAME is the name of the
4637 symbol to generate a reloc against. Exactly one of SECTION and
4638 NAME must be NULL. ADDEND is an expression for the addend. */
4641 lang_add_reloc (bfd_reloc_code_real_type reloc,
4642 reloc_howto_type *howto,
4645 union etree_union *addend)
4647 lang_reloc_statement_type *p = new_stat (lang_reloc_statement, stat_ptr);
4651 p->section = section;
4653 p->addend_exp = addend;
4655 p->addend_value = 0;
4656 p->output_section = NULL;
4660 lang_assignment_statement_type *
4661 lang_add_assignment (etree_type *exp)
4663 lang_assignment_statement_type *new = new_stat (lang_assignment_statement,
4671 lang_add_attribute (enum statement_enum attribute)
4673 new_statement (attribute, sizeof (lang_statement_union_type), stat_ptr);
4677 lang_startup (const char *name)
4679 if (startup_file != NULL)
4681 einfo (_("%P%Fmultiple STARTUP files\n"));
4683 first_file->filename = name;
4684 first_file->local_sym_name = name;
4685 first_file->real = TRUE;
4687 startup_file = name;
4691 lang_float (bfd_boolean maybe)
4693 lang_float_flag = maybe;
4697 /* Work out the load- and run-time regions from a script statement, and
4698 store them in *LMA_REGION and *REGION respectively.
4700 MEMSPEC is the name of the run-time region, or the value of
4701 DEFAULT_MEMORY_REGION if the statement didn't specify one.
4702 LMA_MEMSPEC is the name of the load-time region, or null if the
4703 statement didn't specify one.HAVE_LMA_P is TRUE if the statement
4704 had an explicit load address.
4706 It is an error to specify both a load region and a load address. */
4709 lang_get_regions (lang_memory_region_type **region,
4710 lang_memory_region_type **lma_region,
4711 const char *memspec,
4712 const char *lma_memspec,
4713 bfd_boolean have_lma,
4714 bfd_boolean have_vma)
4716 *lma_region = lang_memory_region_lookup (lma_memspec, FALSE);
4718 /* If no runtime region or VMA has been specified, but the load region has
4719 been specified, then use the load region for the runtime region as well. */
4720 if (lma_memspec != NULL
4722 && strcmp (memspec, DEFAULT_MEMORY_REGION) == 0)
4723 *region = *lma_region;
4725 *region = lang_memory_region_lookup (memspec, FALSE);
4727 if (have_lma && lma_memspec != 0)
4728 einfo (_("%X%P:%S: section has both a load address and a load region\n"));
4732 lang_leave_output_section_statement (fill_type *fill, const char *memspec,
4733 lang_output_section_phdr_list *phdrs,
4734 const char *lma_memspec)
4736 lang_get_regions (¤t_section->region,
4737 ¤t_section->lma_region,
4738 memspec, lma_memspec,
4739 current_section->load_base != NULL,
4740 current_section->addr_tree != NULL);
4741 current_section->fill = fill;
4742 current_section->phdrs = phdrs;
4743 stat_ptr = &statement_list;
4746 /* Create an absolute symbol with the given name with the value of the
4747 address of first byte of the section named.
4749 If the symbol already exists, then do nothing. */
4752 lang_abs_symbol_at_beginning_of (const char *secname, const char *name)
4754 struct bfd_link_hash_entry *h;
4756 h = bfd_link_hash_lookup (link_info.hash, name, TRUE, TRUE, TRUE);
4758 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
4760 if (h->type == bfd_link_hash_new
4761 || h->type == bfd_link_hash_undefined)
4765 h->type = bfd_link_hash_defined;
4767 sec = bfd_get_section_by_name (output_bfd, secname);
4771 h->u.def.value = bfd_get_section_vma (output_bfd, sec);
4773 h->u.def.section = bfd_abs_section_ptr;
4777 /* Create an absolute symbol with the given name with the value of the
4778 address of the first byte after the end of the section named.
4780 If the symbol already exists, then do nothing. */
4783 lang_abs_symbol_at_end_of (const char *secname, const char *name)
4785 struct bfd_link_hash_entry *h;
4787 h = bfd_link_hash_lookup (link_info.hash, name, TRUE, TRUE, TRUE);
4789 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
4791 if (h->type == bfd_link_hash_new
4792 || h->type == bfd_link_hash_undefined)
4796 h->type = bfd_link_hash_defined;
4798 sec = bfd_get_section_by_name (output_bfd, secname);
4802 h->u.def.value = (bfd_get_section_vma (output_bfd, sec)
4803 + TO_ADDR (bfd_section_size (output_bfd, sec)));
4805 h->u.def.section = bfd_abs_section_ptr;
4810 lang_statement_append (lang_statement_list_type *list,
4811 lang_statement_union_type *element,
4812 lang_statement_union_type **field)
4814 *(list->tail) = element;
4818 /* Set the output format type. -oformat overrides scripts. */
4821 lang_add_output_format (const char *format,
4826 if (output_target == NULL || !from_script)
4828 if (command_line.endian == ENDIAN_BIG
4831 else if (command_line.endian == ENDIAN_LITTLE
4835 output_target = format;
4839 /* Enter a group. This creates a new lang_group_statement, and sets
4840 stat_ptr to build new statements within the group. */
4843 lang_enter_group (void)
4845 lang_group_statement_type *g;
4847 g = new_stat (lang_group_statement, stat_ptr);
4848 lang_list_init (&g->children);
4849 stat_ptr = &g->children;
4852 /* Leave a group. This just resets stat_ptr to start writing to the
4853 regular list of statements again. Note that this will not work if
4854 groups can occur inside anything else which can adjust stat_ptr,
4855 but currently they can't. */
4858 lang_leave_group (void)
4860 stat_ptr = &statement_list;
4863 /* Add a new program header. This is called for each entry in a PHDRS
4864 command in a linker script. */
4867 lang_new_phdr (const char *name,
4869 bfd_boolean filehdr,
4874 struct lang_phdr *n, **pp;
4876 n = stat_alloc (sizeof (struct lang_phdr));
4879 n->type = exp_get_value_int (type, 0, "program header type",
4880 lang_final_phase_enum);
4881 n->filehdr = filehdr;
4886 for (pp = &lang_phdr_list; *pp != NULL; pp = &(*pp)->next)
4891 /* Record the program header information in the output BFD. FIXME: We
4892 should not be calling an ELF specific function here. */
4895 lang_record_phdrs (void)
4899 lang_output_section_phdr_list *last;
4900 struct lang_phdr *l;
4901 lang_statement_union_type *u;
4904 secs = xmalloc (alc * sizeof (asection *));
4906 for (l = lang_phdr_list; l != NULL; l = l->next)
4913 for (u = lang_output_section_statement.head;
4915 u = u->output_section_statement.next)
4917 lang_output_section_statement_type *os;
4918 lang_output_section_phdr_list *pl;
4920 os = &u->output_section_statement;
4921 if (os->constraint == -1)
4929 if (os->sectype == noload_section
4930 || os->bfd_section == NULL
4931 || (os->bfd_section->flags & SEC_ALLOC) == 0)
4936 if (os->bfd_section == NULL)
4939 for (; pl != NULL; pl = pl->next)
4941 if (strcmp (pl->name, l->name) == 0)
4946 secs = xrealloc (secs, alc * sizeof (asection *));
4948 secs[c] = os->bfd_section;
4955 if (l->flags == NULL)
4958 flags = exp_get_vma (l->flags, 0, "phdr flags",
4959 lang_final_phase_enum);
4964 at = exp_get_vma (l->at, 0, "phdr load address",
4965 lang_final_phase_enum);
4967 if (! bfd_record_phdr (output_bfd, l->type,
4968 l->flags != NULL, flags, l->at != NULL,
4969 at, l->filehdr, l->phdrs, c, secs))
4970 einfo (_("%F%P: bfd_record_phdr failed: %E\n"));
4975 /* Make sure all the phdr assignments succeeded. */
4976 for (u = lang_output_section_statement.head;
4978 u = u->output_section_statement.next)
4980 lang_output_section_phdr_list *pl;
4982 if (u->output_section_statement.constraint == -1
4983 || u->output_section_statement.bfd_section == NULL)
4986 for (pl = u->output_section_statement.phdrs;
4989 if (! pl->used && strcmp (pl->name, "NONE") != 0)
4990 einfo (_("%X%P: section `%s' assigned to non-existent phdr `%s'\n"),
4991 u->output_section_statement.name, pl->name);
4995 /* Record a list of sections which may not be cross referenced. */
4998 lang_add_nocrossref (lang_nocrossref_type *l)
5000 struct lang_nocrossrefs *n;
5002 n = xmalloc (sizeof *n);
5003 n->next = nocrossref_list;
5005 nocrossref_list = n;
5007 /* Set notice_all so that we get informed about all symbols. */
5008 link_info.notice_all = TRUE;
5011 /* Overlay handling. We handle overlays with some static variables. */
5013 /* The overlay virtual address. */
5014 static etree_type *overlay_vma;
5015 /* And subsection alignment. */
5016 static etree_type *overlay_subalign;
5018 /* An expression for the maximum section size seen so far. */
5019 static etree_type *overlay_max;
5021 /* A list of all the sections in this overlay. */
5023 struct overlay_list {
5024 struct overlay_list *next;
5025 lang_output_section_statement_type *os;
5028 static struct overlay_list *overlay_list;
5030 /* Start handling an overlay. */
5033 lang_enter_overlay (etree_type *vma_expr, etree_type *subalign)
5035 /* The grammar should prevent nested overlays from occurring. */
5036 ASSERT (overlay_vma == NULL
5037 && overlay_subalign == NULL
5038 && overlay_max == NULL);
5040 overlay_vma = vma_expr;
5041 overlay_subalign = subalign;
5044 /* Start a section in an overlay. We handle this by calling
5045 lang_enter_output_section_statement with the correct VMA.
5046 lang_leave_overlay sets up the LMA and memory regions. */
5049 lang_enter_overlay_section (const char *name)
5051 struct overlay_list *n;
5054 lang_enter_output_section_statement (name, overlay_vma, normal_section,
5055 0, overlay_subalign, 0, 0);
5057 /* If this is the first section, then base the VMA of future
5058 sections on this one. This will work correctly even if `.' is
5059 used in the addresses. */
5060 if (overlay_list == NULL)
5061 overlay_vma = exp_nameop (ADDR, name);
5063 /* Remember the section. */
5064 n = xmalloc (sizeof *n);
5065 n->os = current_section;
5066 n->next = overlay_list;
5069 size = exp_nameop (SIZEOF, name);
5071 /* Arrange to work out the maximum section end address. */
5072 if (overlay_max == NULL)
5075 overlay_max = exp_binop (MAX_K, overlay_max, size);
5078 /* Finish a section in an overlay. There isn't any special to do
5082 lang_leave_overlay_section (fill_type *fill,
5083 lang_output_section_phdr_list *phdrs)
5090 name = current_section->name;
5092 /* For now, assume that DEFAULT_MEMORY_REGION is the run-time memory
5093 region and that no load-time region has been specified. It doesn't
5094 really matter what we say here, since lang_leave_overlay will
5096 lang_leave_output_section_statement (fill, DEFAULT_MEMORY_REGION, phdrs, 0);
5098 /* Define the magic symbols. */
5100 clean = xmalloc (strlen (name) + 1);
5102 for (s1 = name; *s1 != '\0'; s1++)
5103 if (ISALNUM (*s1) || *s1 == '_')
5107 buf = xmalloc (strlen (clean) + sizeof "__load_start_");
5108 sprintf (buf, "__load_start_%s", clean);
5109 lang_add_assignment (exp_assop ('=', buf,
5110 exp_nameop (LOADADDR, name)));
5112 buf = xmalloc (strlen (clean) + sizeof "__load_stop_");
5113 sprintf (buf, "__load_stop_%s", clean);
5114 lang_add_assignment (exp_assop ('=', buf,
5116 exp_nameop (LOADADDR, name),
5117 exp_nameop (SIZEOF, name))));
5122 /* Finish an overlay. If there are any overlay wide settings, this
5123 looks through all the sections in the overlay and sets them. */
5126 lang_leave_overlay (etree_type *lma_expr,
5129 const char *memspec,
5130 lang_output_section_phdr_list *phdrs,
5131 const char *lma_memspec)
5133 lang_memory_region_type *region;
5134 lang_memory_region_type *lma_region;
5135 struct overlay_list *l;
5136 lang_nocrossref_type *nocrossref;
5138 lang_get_regions (®ion, &lma_region,
5139 memspec, lma_memspec,
5140 lma_expr != NULL, FALSE);
5144 /* After setting the size of the last section, set '.' to end of the
5146 if (overlay_list != NULL)
5147 overlay_list->os->update_dot_tree
5148 = exp_assop ('=', ".", exp_binop ('+', overlay_vma, overlay_max));
5153 struct overlay_list *next;
5155 if (fill != NULL && l->os->fill == NULL)
5158 l->os->region = region;
5159 l->os->lma_region = lma_region;
5161 /* The first section has the load address specified in the
5162 OVERLAY statement. The rest are worked out from that.
5163 The base address is not needed (and should be null) if
5164 an LMA region was specified. */
5166 l->os->load_base = lma_expr;
5167 else if (lma_region == 0)
5168 l->os->load_base = exp_binop ('+',
5169 exp_nameop (LOADADDR, l->next->os->name),
5170 exp_nameop (SIZEOF, l->next->os->name));
5172 if (phdrs != NULL && l->os->phdrs == NULL)
5173 l->os->phdrs = phdrs;
5177 lang_nocrossref_type *nc;
5179 nc = xmalloc (sizeof *nc);
5180 nc->name = l->os->name;
5181 nc->next = nocrossref;
5190 if (nocrossref != NULL)
5191 lang_add_nocrossref (nocrossref);
5194 overlay_list = NULL;
5198 /* Version handling. This is only useful for ELF. */
5200 /* This global variable holds the version tree that we build. */
5202 struct bfd_elf_version_tree *lang_elf_version_info;
5204 /* If PREV is NULL, return first version pattern matching particular symbol.
5205 If PREV is non-NULL, return first version pattern matching particular
5206 symbol after PREV (previously returned by lang_vers_match). */
5208 static struct bfd_elf_version_expr *
5209 lang_vers_match (struct bfd_elf_version_expr_head *head,
5210 struct bfd_elf_version_expr *prev,
5213 const char *cxx_sym = sym;
5214 const char *java_sym = sym;
5215 struct bfd_elf_version_expr *expr = NULL;
5217 if (head->mask & BFD_ELF_VERSION_CXX_TYPE)
5219 cxx_sym = cplus_demangle (sym, DMGL_PARAMS | DMGL_ANSI);
5223 if (head->mask & BFD_ELF_VERSION_JAVA_TYPE)
5225 java_sym = cplus_demangle (sym, DMGL_JAVA);
5230 if (head->htab && (prev == NULL || prev->symbol))
5232 struct bfd_elf_version_expr e;
5234 switch (prev ? prev->mask : 0)
5237 if (head->mask & BFD_ELF_VERSION_C_TYPE)
5240 expr = htab_find (head->htab, &e);
5241 while (expr && strcmp (expr->symbol, sym) == 0)
5242 if (expr->mask == BFD_ELF_VERSION_C_TYPE)
5248 case BFD_ELF_VERSION_C_TYPE:
5249 if (head->mask & BFD_ELF_VERSION_CXX_TYPE)
5252 expr = htab_find (head->htab, &e);
5253 while (expr && strcmp (expr->symbol, cxx_sym) == 0)
5254 if (expr->mask == BFD_ELF_VERSION_CXX_TYPE)
5260 case BFD_ELF_VERSION_CXX_TYPE:
5261 if (head->mask & BFD_ELF_VERSION_JAVA_TYPE)
5263 e.symbol = java_sym;
5264 expr = htab_find (head->htab, &e);
5265 while (expr && strcmp (expr->symbol, java_sym) == 0)
5266 if (expr->mask == BFD_ELF_VERSION_JAVA_TYPE)
5277 /* Finally, try the wildcards. */
5278 if (prev == NULL || prev->symbol)
5279 expr = head->remaining;
5286 if (expr->pattern[0] == '*' && expr->pattern[1] == '\0')
5289 if (expr->mask == BFD_ELF_VERSION_JAVA_TYPE)
5291 else if (expr->mask == BFD_ELF_VERSION_CXX_TYPE)
5295 if (fnmatch (expr->pattern, s, 0) == 0)
5302 free ((char *) cxx_sym);
5303 if (java_sym != sym)
5304 free ((char *) java_sym);
5308 /* Return NULL if the PATTERN argument is a glob pattern, otherwise,
5309 return a string pointing to the symbol name. */
5312 realsymbol (const char *pattern)
5315 bfd_boolean changed = FALSE, backslash = FALSE;
5316 char *s, *symbol = xmalloc (strlen (pattern) + 1);
5318 for (p = pattern, s = symbol; *p != '\0'; ++p)
5320 /* It is a glob pattern only if there is no preceding
5322 if (! backslash && (*p == '?' || *p == '*' || *p == '['))
5330 /* Remove the preceding backslash. */
5337 backslash = *p == '\\';
5352 /* This is called for each variable name or match expression. */
5354 struct bfd_elf_version_expr *
5355 lang_new_vers_pattern (struct bfd_elf_version_expr *orig,
5359 struct bfd_elf_version_expr *ret;
5361 ret = xmalloc (sizeof *ret);
5366 ret->symbol = realsymbol (new);
5368 if (lang == NULL || strcasecmp (lang, "C") == 0)
5369 ret->mask = BFD_ELF_VERSION_C_TYPE;
5370 else if (strcasecmp (lang, "C++") == 0)
5371 ret->mask = BFD_ELF_VERSION_CXX_TYPE;
5372 else if (strcasecmp (lang, "Java") == 0)
5373 ret->mask = BFD_ELF_VERSION_JAVA_TYPE;
5376 einfo (_("%X%P: unknown language `%s' in version information\n"),
5378 ret->mask = BFD_ELF_VERSION_C_TYPE;
5381 return ldemul_new_vers_pattern (ret);
5384 /* This is called for each set of variable names and match
5387 struct bfd_elf_version_tree *
5388 lang_new_vers_node (struct bfd_elf_version_expr *globals,
5389 struct bfd_elf_version_expr *locals)
5391 struct bfd_elf_version_tree *ret;
5393 ret = xcalloc (1, sizeof *ret);
5394 ret->globals.list = globals;
5395 ret->locals.list = locals;
5396 ret->match = lang_vers_match;
5397 ret->name_indx = (unsigned int) -1;
5401 /* This static variable keeps track of version indices. */
5403 static int version_index;
5406 version_expr_head_hash (const void *p)
5408 const struct bfd_elf_version_expr *e = p;
5410 return htab_hash_string (e->symbol);
5414 version_expr_head_eq (const void *p1, const void *p2)
5416 const struct bfd_elf_version_expr *e1 = p1;
5417 const struct bfd_elf_version_expr *e2 = p2;
5419 return strcmp (e1->symbol, e2->symbol) == 0;
5423 lang_finalize_version_expr_head (struct bfd_elf_version_expr_head *head)
5426 struct bfd_elf_version_expr *e, *next;
5427 struct bfd_elf_version_expr **list_loc, **remaining_loc;
5429 for (e = head->list; e; e = e->next)
5433 head->mask |= e->mask;
5438 head->htab = htab_create (count * 2, version_expr_head_hash,
5439 version_expr_head_eq, NULL);
5440 list_loc = &head->list;
5441 remaining_loc = &head->remaining;
5442 for (e = head->list; e; e = next)
5448 remaining_loc = &e->next;
5452 void **loc = htab_find_slot (head->htab, e, INSERT);
5456 struct bfd_elf_version_expr *e1, *last;
5462 if (e1->mask == e->mask)
5470 while (e1 && strcmp (e1->symbol, e->symbol) == 0);
5474 /* This is a duplicate. */
5475 /* FIXME: Memory leak. Sometimes pattern is not
5476 xmalloced alone, but in larger chunk of memory. */
5477 /* free (e->symbol); */
5482 e->next = last->next;
5490 list_loc = &e->next;
5494 *remaining_loc = NULL;
5495 *list_loc = head->remaining;
5498 head->remaining = head->list;
5501 /* This is called when we know the name and dependencies of the
5505 lang_register_vers_node (const char *name,
5506 struct bfd_elf_version_tree *version,
5507 struct bfd_elf_version_deps *deps)
5509 struct bfd_elf_version_tree *t, **pp;
5510 struct bfd_elf_version_expr *e1;
5515 if ((name[0] == '\0' && lang_elf_version_info != NULL)
5516 || (lang_elf_version_info && lang_elf_version_info->name[0] == '\0'))
5518 einfo (_("%X%P: anonymous version tag cannot be combined with other version tags\n"));
5523 /* Make sure this node has a unique name. */
5524 for (t = lang_elf_version_info; t != NULL; t = t->next)
5525 if (strcmp (t->name, name) == 0)
5526 einfo (_("%X%P: duplicate version tag `%s'\n"), name);
5528 lang_finalize_version_expr_head (&version->globals);
5529 lang_finalize_version_expr_head (&version->locals);
5531 /* Check the global and local match names, and make sure there
5532 aren't any duplicates. */
5534 for (e1 = version->globals.list; e1 != NULL; e1 = e1->next)
5536 for (t = lang_elf_version_info; t != NULL; t = t->next)
5538 struct bfd_elf_version_expr *e2;
5540 if (t->locals.htab && e1->symbol)
5542 e2 = htab_find (t->locals.htab, e1);
5543 while (e2 && strcmp (e1->symbol, e2->symbol) == 0)
5545 if (e1->mask == e2->mask)
5546 einfo (_("%X%P: duplicate expression `%s' in version information\n"),
5551 else if (!e1->symbol)
5552 for (e2 = t->locals.remaining; e2 != NULL; e2 = e2->next)
5553 if (strcmp (e1->pattern, e2->pattern) == 0 && e1->mask == e2->mask)
5554 einfo (_("%X%P: duplicate expression `%s' in version information\n"),
5559 for (e1 = version->locals.list; e1 != NULL; e1 = e1->next)
5561 for (t = lang_elf_version_info; t != NULL; t = t->next)
5563 struct bfd_elf_version_expr *e2;
5565 if (t->globals.htab && e1->symbol)
5567 e2 = htab_find (t->globals.htab, e1);
5568 while (e2 && strcmp (e1->symbol, e2->symbol) == 0)
5570 if (e1->mask == e2->mask)
5571 einfo (_("%X%P: duplicate expression `%s' in version information\n"),
5576 else if (!e1->symbol)
5577 for (e2 = t->globals.remaining; e2 != NULL; e2 = e2->next)
5578 if (strcmp (e1->pattern, e2->pattern) == 0 && e1->mask == e2->mask)
5579 einfo (_("%X%P: duplicate expression `%s' in version information\n"),
5584 version->deps = deps;
5585 version->name = name;
5586 if (name[0] != '\0')
5589 version->vernum = version_index;
5592 version->vernum = 0;
5594 for (pp = &lang_elf_version_info; *pp != NULL; pp = &(*pp)->next)
5599 /* This is called when we see a version dependency. */
5601 struct bfd_elf_version_deps *
5602 lang_add_vers_depend (struct bfd_elf_version_deps *list, const char *name)
5604 struct bfd_elf_version_deps *ret;
5605 struct bfd_elf_version_tree *t;
5607 ret = xmalloc (sizeof *ret);
5610 for (t = lang_elf_version_info; t != NULL; t = t->next)
5612 if (strcmp (t->name, name) == 0)
5614 ret->version_needed = t;
5619 einfo (_("%X%P: unable to find version dependency `%s'\n"), name);
5625 lang_do_version_exports_section (void)
5627 struct bfd_elf_version_expr *greg = NULL, *lreg;
5629 LANG_FOR_EACH_INPUT_STATEMENT (is)
5631 asection *sec = bfd_get_section_by_name (is->the_bfd, ".exports");
5638 len = bfd_section_size (is->the_bfd, sec);
5639 contents = xmalloc (len);
5640 if (!bfd_get_section_contents (is->the_bfd, sec, contents, 0, len))
5641 einfo (_("%X%P: unable to read .exports section contents\n"), sec);
5644 while (p < contents + len)
5646 greg = lang_new_vers_pattern (greg, p, NULL);
5647 p = strchr (p, '\0') + 1;
5650 /* Do not free the contents, as we used them creating the regex. */
5652 /* Do not include this section in the link. */
5653 bfd_set_section_flags (is->the_bfd, sec,
5654 bfd_get_section_flags (is->the_bfd, sec) | SEC_EXCLUDE);
5657 lreg = lang_new_vers_pattern (NULL, "*", NULL);
5658 lang_register_vers_node (command_line.version_exports_section,
5659 lang_new_vers_node (greg, lreg), NULL);
5663 lang_add_unique (const char *name)
5665 struct unique_sections *ent;
5667 for (ent = unique_section_list; ent; ent = ent->next)
5668 if (strcmp (ent->name, name) == 0)
5671 ent = xmalloc (sizeof *ent);
5672 ent->name = xstrdup (name);
5673 ent->next = unique_section_list;
5674 unique_section_list = ent;