/* Linker command language support. Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc. This file is part of GLD, the Gnu Linker. GLD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GLD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GLD; see the file COPYING. If not, write to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "bfd.h" #include "sysdep.h" #include "libiberty.h" #include "safe-ctype.h" #include "obstack.h" #include "bfdlink.h" #include "ld.h" #include "ldmain.h" #include "ldexp.h" #include "ldlang.h" #include "ldgram.h" #include "ldlex.h" #include "ldmisc.h" #include "ldctor.h" #include "ldfile.h" #include "ldemul.h" #include "fnmatch.h" #include "demangle.h" /* FORWARDS */ static lang_statement_union_type *new_statement PARAMS ((enum statement_enum, size_t, lang_statement_list_type *)); /* LOCALS */ static struct obstack stat_obstack; #define obstack_chunk_alloc xmalloc #define obstack_chunk_free free static const char *startup_file; static lang_statement_list_type input_file_chain; static boolean placed_commons = false; static lang_output_section_statement_type *default_common_section; static boolean map_option_f; static bfd_vma print_dot; static lang_input_statement_type *first_file; static const char *current_target; static const char *output_target; static lang_statement_list_type statement_list; static struct lang_phdr *lang_phdr_list; static void lang_for_each_statement_worker PARAMS ((void (*) (lang_statement_union_type *), lang_statement_union_type *)); static lang_input_statement_type *new_afile PARAMS ((const char *, lang_input_file_enum_type, const char *, boolean)); static lang_memory_region_type *lang_memory_default PARAMS ((asection *)); static void lang_map_flags PARAMS ((flagword)); static void init_os PARAMS ((lang_output_section_statement_type *)); static void exp_init_os PARAMS ((etree_type *)); static void section_already_linked PARAMS ((bfd *, asection *, PTR)); static struct bfd_hash_entry *already_linked_newfunc PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); static void already_linked_table_init PARAMS ((void)); static void already_linked_table_free PARAMS ((void)); static boolean wildcardp PARAMS ((const char *)); static lang_statement_union_type *wild_sort PARAMS ((lang_wild_statement_type *, struct wildcard_list *, lang_input_statement_type *, asection *)); static void output_section_callback PARAMS ((lang_wild_statement_type *, struct wildcard_list *, asection *, lang_input_statement_type *, PTR)); static lang_input_statement_type *lookup_name PARAMS ((const char *)); static boolean load_symbols PARAMS ((lang_input_statement_type *, lang_statement_list_type *)); static void wild PARAMS ((lang_wild_statement_type *, const char *, lang_output_section_statement_type *)); static bfd *open_output PARAMS ((const char *)); static void ldlang_open_output PARAMS ((lang_statement_union_type *)); static void open_input_bfds PARAMS ((lang_statement_union_type *, boolean)); static void lang_reasonable_defaults PARAMS ((void)); static void insert_undefined PARAMS ((const char *)); static void lang_place_undefineds PARAMS ((void)); static void map_input_to_output_sections PARAMS ((lang_statement_union_type *, const char *, lang_output_section_statement_type *)); static void strip_excluded_output_sections PARAMS ((void)); static void print_output_section_statement PARAMS ((lang_output_section_statement_type *)); static void print_assignment PARAMS ((lang_assignment_statement_type *, lang_output_section_statement_type *)); static void print_input_statement PARAMS ((lang_input_statement_type *)); static boolean print_one_symbol PARAMS ((struct bfd_link_hash_entry *, PTR)); static void print_input_section PARAMS ((lang_input_section_type *)); static void print_fill_statement PARAMS ((lang_fill_statement_type *)); static void print_data_statement PARAMS ((lang_data_statement_type *)); static void print_address_statement PARAMS ((lang_address_statement_type *)); static void print_reloc_statement PARAMS ((lang_reloc_statement_type *)); static void print_padding_statement PARAMS ((lang_padding_statement_type *)); static void print_wild_statement PARAMS ((lang_wild_statement_type *, lang_output_section_statement_type *)); static void print_group PARAMS ((lang_group_statement_type *, lang_output_section_statement_type *)); static void print_statement PARAMS ((lang_statement_union_type *, lang_output_section_statement_type *)); static void print_statement_list PARAMS ((lang_statement_union_type *, lang_output_section_statement_type *)); static void print_statements PARAMS ((void)); static void insert_pad PARAMS ((lang_statement_union_type **, fill_type *, unsigned int, asection *, bfd_vma)); static bfd_vma size_input_section PARAMS ((lang_statement_union_type **, lang_output_section_statement_type *, fill_type *, bfd_vma)); static void lang_finish PARAMS ((void)); static void ignore_bfd_errors PARAMS ((const char *, ...)); static void lang_check PARAMS ((void)); static void lang_common PARAMS ((void)); static boolean lang_one_common PARAMS ((struct bfd_link_hash_entry *, PTR)); static void lang_place_orphans PARAMS ((void)); static int topower PARAMS ((int)); static void lang_set_startof PARAMS ((void)); static void gc_section_callback PARAMS ((lang_wild_statement_type *, struct wildcard_list *, asection *, lang_input_statement_type *, PTR)); static void lang_get_regions PARAMS ((struct memory_region_struct **, struct memory_region_struct **, const char *, const char *, int)); static void lang_record_phdrs PARAMS ((void)); static void lang_gc_wild PARAMS ((lang_wild_statement_type *)); static void lang_gc_sections_1 PARAMS ((lang_statement_union_type *)); static void lang_gc_sections PARAMS ((void)); static int lang_vers_match_lang_c PARAMS ((struct bfd_elf_version_expr *, const char *)); static int lang_vers_match_lang_cplusplus PARAMS ((struct bfd_elf_version_expr *, const char *)); static int lang_vers_match_lang_java PARAMS ((struct bfd_elf_version_expr *, const char *)); static void lang_do_version_exports_section PARAMS ((void)); static void lang_check_section_addresses PARAMS ((void)); static void os_region_check PARAMS ((lang_output_section_statement_type *, struct memory_region_struct *, etree_type *, bfd_vma)); static bfd_vma lang_size_sections_1 PARAMS ((lang_statement_union_type *, lang_output_section_statement_type *, lang_statement_union_type **, fill_type *, bfd_vma, boolean *)); typedef void (*callback_t) PARAMS ((lang_wild_statement_type *, struct wildcard_list *, asection *, lang_input_statement_type *, PTR)); static void walk_wild PARAMS ((lang_wild_statement_type *, callback_t, PTR)); static void walk_wild_section PARAMS ((lang_wild_statement_type *, lang_input_statement_type *, callback_t, PTR)); static void walk_wild_file PARAMS ((lang_wild_statement_type *, lang_input_statement_type *, callback_t, PTR)); static int get_target PARAMS ((const bfd_target *, PTR)); static void stricpy PARAMS ((char *, char *)); static void strcut PARAMS ((char *, char *)); static int name_compare PARAMS ((char *, char *)); static int closest_target_match PARAMS ((const bfd_target *, PTR)); static char * get_first_input_target PARAMS ((void)); /* EXPORTS */ lang_output_section_statement_type *abs_output_section; lang_statement_list_type lang_output_section_statement; lang_statement_list_type *stat_ptr = &statement_list; lang_statement_list_type file_chain = { NULL, NULL }; struct bfd_sym_chain entry_symbol = { NULL, NULL }; const char *entry_section = ".text"; boolean entry_from_cmdline; boolean lang_has_input_file = false; boolean had_output_filename = false; boolean lang_float_flag = false; boolean delete_output_file_on_failure = false; struct lang_nocrossrefs *nocrossref_list; struct unique_sections *unique_section_list; etree_type *base; /* Relocation base - or null */ #if defined (__STDC__) || defined (ALMOST_STDC) #define cat(a,b) a##b #else #define cat(a,b) a/**/b #endif /* Don't beautify the line below with "innocent" whitespace, it breaks the K&R C preprocessor! */ #define new_stat(x, y) \ (cat (x,_type)*) new_statement (cat (x,_enum), sizeof (cat (x,_type)), y) #define outside_section_address(q) \ ((q)->output_offset + (q)->output_section->vma) #define outside_symbol_address(q) \ ((q)->value + outside_section_address (q->section)) #define SECTION_NAME_MAP_LENGTH (16) PTR stat_alloc (size) size_t size; { return obstack_alloc (&stat_obstack, size); } boolean unique_section_p (secnam) const char *secnam; { struct unique_sections *unam; for (unam = unique_section_list; unam; unam = unam->next) if (wildcardp (unam->name) ? fnmatch (unam->name, secnam, 0) == 0 : strcmp (unam->name, secnam) == 0) { return true; } return false; } /* Generic traversal routines for finding matching sections. */ static void walk_wild_section (ptr, file, callback, data) lang_wild_statement_type *ptr; lang_input_statement_type *file; callback_t callback; PTR data; { asection *s; if (file->just_syms_flag) return; for (s = file->the_bfd->sections; s != NULL; s = s->next) { struct wildcard_list *sec; sec = ptr->section_list; if (sec == NULL) (*callback) (ptr, sec, s, file, data); while (sec != NULL) { boolean skip = false; struct name_list *list_tmp; /* Don't process sections from files which were excluded. */ for (list_tmp = sec->spec.exclude_name_list; list_tmp; list_tmp = list_tmp->next) { if (wildcardp (list_tmp->name)) skip = fnmatch (list_tmp->name, file->filename, 0) == 0; else skip = strcmp (list_tmp->name, file->filename) == 0; /* If this file is part of an archive, and the archive is excluded, exclude this file. */ if (! skip && file->the_bfd != NULL && file->the_bfd->my_archive != NULL && file->the_bfd->my_archive->filename != NULL) { if (wildcardp (list_tmp->name)) skip = fnmatch (list_tmp->name, file->the_bfd->my_archive->filename, 0) == 0; else skip = strcmp (list_tmp->name, file->the_bfd->my_archive->filename) == 0; } if (skip) break; } if (!skip && sec->spec.name != NULL) { const char *sname = bfd_get_section_name (file->the_bfd, s); if (wildcardp (sec->spec.name)) skip = fnmatch (sec->spec.name, sname, 0) != 0; else skip = strcmp (sec->spec.name, sname) != 0; } if (!skip) (*callback) (ptr, sec, s, file, data); sec = sec->next; } } } /* Handle a wild statement for a single file F. */ static void walk_wild_file (s, f, callback, data) lang_wild_statement_type *s; lang_input_statement_type *f; callback_t callback; PTR data; { if (f->the_bfd == NULL || ! bfd_check_format (f->the_bfd, bfd_archive)) walk_wild_section (s, f, callback, data); else { bfd *member; /* This is an archive file. We must map each member of the archive separately. */ member = bfd_openr_next_archived_file (f->the_bfd, (bfd *) NULL); while (member != NULL) { /* When lookup_name is called, it will call the add_symbols entry point for the archive. For each element of the archive which is included, BFD will call ldlang_add_file, which will set the usrdata field of the member to the lang_input_statement. */ if (member->usrdata != NULL) { walk_wild_section (s, (lang_input_statement_type *) member->usrdata, callback, data); } member = bfd_openr_next_archived_file (f->the_bfd, member); } } } static void walk_wild (s, callback, data) lang_wild_statement_type *s; callback_t callback; PTR data; { const char *file_spec = s->filename; if (file_spec == NULL) { /* Perform the iteration over all files in the list. */ LANG_FOR_EACH_INPUT_STATEMENT (f) { walk_wild_file (s, f, callback, data); } } else if (wildcardp (file_spec)) { LANG_FOR_EACH_INPUT_STATEMENT (f) { if (fnmatch (file_spec, f->filename, FNM_FILE_NAME) == 0) walk_wild_file (s, f, callback, data); } } else { lang_input_statement_type *f; /* Perform the iteration over a single file. */ f = lookup_name (file_spec); if (f) walk_wild_file (s, f, callback, data); } } /* lang_for_each_statement walks the parse tree and calls the provided function for each node. */ static void lang_for_each_statement_worker (func, s) void (*func) PARAMS ((lang_statement_union_type *)); lang_statement_union_type *s; { for (; s != (lang_statement_union_type *) NULL; s = s->header.next) { func (s); switch (s->header.type) { case lang_constructors_statement_enum: lang_for_each_statement_worker (func, constructor_list.head); break; case lang_output_section_statement_enum: lang_for_each_statement_worker (func, s->output_section_statement.children.head); break; case lang_wild_statement_enum: lang_for_each_statement_worker (func, s->wild_statement.children.head); break; case lang_group_statement_enum: lang_for_each_statement_worker (func, s->group_statement.children.head); break; case lang_data_statement_enum: case lang_reloc_statement_enum: case lang_object_symbols_statement_enum: case lang_output_statement_enum: case lang_target_statement_enum: case lang_input_section_enum: case lang_input_statement_enum: case lang_assignment_statement_enum: case lang_padding_statement_enum: case lang_address_statement_enum: case lang_fill_statement_enum: break; default: FAIL (); break; } } } void lang_for_each_statement (func) void (*func) PARAMS ((lang_statement_union_type *)); { lang_for_each_statement_worker (func, statement_list.head); } /*----------------------------------------------------------------------*/ void lang_list_init (list) lang_statement_list_type *list; { list->head = (lang_statement_union_type *) NULL; list->tail = &list->head; } /* Build a new statement node for the parse tree. */ static lang_statement_union_type * new_statement (type, size, list) enum statement_enum type; size_t size; lang_statement_list_type *list; { lang_statement_union_type *new = (lang_statement_union_type *) stat_alloc (size); new->header.type = type; new->header.next = (lang_statement_union_type *) NULL; lang_statement_append (list, new, &new->header.next); return new; } /* Build a new input file node for the language. There are several ways in which we treat an input file, eg, we only look at symbols, or prefix it with a -l etc. We can be supplied with requests for input files more than once; they may, for example be split over serveral lines like foo.o(.text) foo.o(.data) etc, so when asked for a file we check that we haven't got it already so we don't duplicate the bfd. */ static lang_input_statement_type * new_afile (name, file_type, target, add_to_list) const char *name; lang_input_file_enum_type file_type; const char *target; boolean add_to_list; { lang_input_statement_type *p; if (add_to_list) p = new_stat (lang_input_statement, stat_ptr); else { p = ((lang_input_statement_type *) stat_alloc (sizeof (lang_input_statement_type))); p->header.next = NULL; } lang_has_input_file = true; p->target = target; switch (file_type) { case lang_input_file_is_symbols_only_enum: p->filename = name; p->is_archive = false; p->real = true; p->local_sym_name = name; p->just_syms_flag = true; p->search_dirs_flag = false; break; case lang_input_file_is_fake_enum: p->filename = name; p->is_archive = false; p->real = false; p->local_sym_name = name; p->just_syms_flag = false; p->search_dirs_flag = false; break; case lang_input_file_is_l_enum: p->is_archive = true; p->filename = name; p->real = true; p->local_sym_name = concat ("-l", name, (const char *) NULL); p->just_syms_flag = false; p->search_dirs_flag = true; break; case lang_input_file_is_marker_enum: p->filename = name; p->is_archive = false; p->real = false; p->local_sym_name = name; p->just_syms_flag = false; p->search_dirs_flag = true; break; case lang_input_file_is_search_file_enum: p->filename = name; p->is_archive = false; p->real = true; p->local_sym_name = name; p->just_syms_flag = false; p->search_dirs_flag = true; break; case lang_input_file_is_file_enum: p->filename = name; p->is_archive = false; p->real = true; p->local_sym_name = name; p->just_syms_flag = false; p->search_dirs_flag = false; break; default: FAIL (); } p->the_bfd = (bfd *) NULL; p->asymbols = (asymbol **) NULL; p->next_real_file = (lang_statement_union_type *) NULL; p->next = (lang_statement_union_type *) NULL; p->symbol_count = 0; p->dynamic = config.dynamic_link; p->whole_archive = whole_archive; p->loaded = false; lang_statement_append (&input_file_chain, (lang_statement_union_type *) p, &p->next_real_file); return p; } lang_input_statement_type * lang_add_input_file (name, file_type, target) const char *name; lang_input_file_enum_type file_type; const char *target; { lang_has_input_file = true; return new_afile (name, file_type, target, true); } /* Build enough state so that the parser can build its tree. */ void lang_init () { obstack_begin (&stat_obstack, 1000); stat_ptr = &statement_list; lang_list_init (stat_ptr); lang_list_init (&input_file_chain); lang_list_init (&lang_output_section_statement); lang_list_init (&file_chain); first_file = lang_add_input_file ((char *) NULL, lang_input_file_is_marker_enum, (char *) NULL); abs_output_section = lang_output_section_statement_lookup (BFD_ABS_SECTION_NAME); abs_output_section->bfd_section = bfd_abs_section_ptr; } /*---------------------------------------------------------------------- A region is an area of memory declared with the MEMORY { name:org=exp, len=exp ... } syntax. We maintain a list of all the regions here. If no regions are specified in the script, then the default is used which is created when looked up to be the entire data space. */ static lang_memory_region_type *lang_memory_region_list; static lang_memory_region_type **lang_memory_region_list_tail = &lang_memory_region_list; lang_memory_region_type * lang_memory_region_lookup (name) const char *const name; { lang_memory_region_type *p; /* NAME is NULL for LMA memspecs if no region was specified. */ if (name == NULL) return NULL; for (p = lang_memory_region_list; p != (lang_memory_region_type *) NULL; p = p->next) { if (strcmp (p->name, name) == 0) { return p; } } #if 0 /* This code used to always use the first region in the list as the default region. I changed it to instead use a region encompassing all of memory as the default region. This permits NOLOAD sections to work reasonably without requiring a region. People should specify what region they mean, if they really want a region. */ if (strcmp (name, "*default*") == 0) { if (lang_memory_region_list != (lang_memory_region_type *) NULL) { return lang_memory_region_list; } } #endif { lang_memory_region_type *new = (lang_memory_region_type *) stat_alloc (sizeof (lang_memory_region_type)); new->name = xstrdup (name); new->next = (lang_memory_region_type *) NULL; *lang_memory_region_list_tail = new; lang_memory_region_list_tail = &new->next; new->origin = 0; new->flags = 0; new->not_flags = 0; new->length = ~(bfd_size_type) 0; new->current = 0; new->had_full_message = false; return new; } } static lang_memory_region_type * lang_memory_default (section) asection *section; { lang_memory_region_type *p; flagword sec_flags = section->flags; /* Override SEC_DATA to mean a writable section. */ if ((sec_flags & (SEC_ALLOC | SEC_READONLY | SEC_CODE)) == SEC_ALLOC) sec_flags |= SEC_DATA; for (p = lang_memory_region_list; p != (lang_memory_region_type *) NULL; p = p->next) { if ((p->flags & sec_flags) != 0 && (p->not_flags & sec_flags) == 0) { return p; } } return lang_memory_region_lookup ("*default*"); } lang_output_section_statement_type * lang_output_section_find (name) const char *const name; { lang_statement_union_type *u; lang_output_section_statement_type *lookup; for (u = lang_output_section_statement.head; u != (lang_statement_union_type *) NULL; u = lookup->next) { lookup = &u->output_section_statement; if (strcmp (name, lookup->name) == 0) { return lookup; } } return (lang_output_section_statement_type *) NULL; } lang_output_section_statement_type * lang_output_section_statement_lookup (name) const char *const name; { lang_output_section_statement_type *lookup; lookup = lang_output_section_find (name); if (lookup == (lang_output_section_statement_type *) NULL) { lookup = (lang_output_section_statement_type *) new_stat (lang_output_section_statement, stat_ptr); lookup->region = (lang_memory_region_type *) NULL; lookup->lma_region = (lang_memory_region_type *) NULL; lookup->fill = (fill_type *) 0; lookup->block_value = 1; lookup->name = name; lookup->next = (lang_statement_union_type *) NULL; lookup->bfd_section = (asection *) NULL; lookup->processed = false; lookup->sectype = normal_section; lookup->addr_tree = (etree_type *) NULL; lang_list_init (&lookup->children); lookup->memspec = (const char *) NULL; lookup->flags = 0; lookup->subsection_alignment = -1; lookup->section_alignment = -1; lookup->load_base = (union etree_union *) NULL; lookup->update_dot_tree = NULL; lookup->phdrs = NULL; lang_statement_append (&lang_output_section_statement, (lang_statement_union_type *) lookup, &lookup->next); } return lookup; } static void lang_map_flags (flag) flagword flag; { if (flag & SEC_ALLOC) minfo ("a"); if (flag & SEC_CODE) minfo ("x"); if (flag & SEC_READONLY) minfo ("r"); if (flag & SEC_DATA) minfo ("w"); if (flag & SEC_LOAD) minfo ("l"); } void lang_map () { lang_memory_region_type *m; minfo (_("\nMemory Configuration\n\n")); fprintf (config.map_file, "%-16s %-18s %-18s %s\n", _("Name"), _("Origin"), _("Length"), _("Attributes")); for (m = lang_memory_region_list; m != (lang_memory_region_type *) NULL; m = m->next) { char buf[100]; int len; fprintf (config.map_file, "%-16s ", m->name); sprintf_vma (buf, m->origin); minfo ("0x%s ", buf); len = strlen (buf); while (len < 16) { print_space (); ++len; } minfo ("0x%V", m->length); if (m->flags || m->not_flags) { #ifndef BFD64 minfo (" "); #endif if (m->flags) { print_space (); lang_map_flags (m->flags); } if (m->not_flags) { minfo (" !"); lang_map_flags (m->not_flags); } } print_nl (); } fprintf (config.map_file, _("\nLinker script and memory map\n\n")); print_statements (); } /* Initialize an output section. */ static void init_os (s) lang_output_section_statement_type *s; { section_userdata_type *new; if (s->bfd_section != NULL) return; if (strcmp (s->name, DISCARD_SECTION_NAME) == 0) einfo (_("%P%F: Illegal use of `%s' section\n"), DISCARD_SECTION_NAME); new = ((section_userdata_type *) stat_alloc (sizeof (section_userdata_type))); s->bfd_section = bfd_get_section_by_name (output_bfd, s->name); if (s->bfd_section == (asection *) NULL) s->bfd_section = bfd_make_section (output_bfd, s->name); if (s->bfd_section == (asection *) NULL) { einfo (_("%P%F: output format %s cannot represent section called %s\n"), output_bfd->xvec->name, s->name); } s->bfd_section->output_section = s->bfd_section; /* We initialize an output sections output offset to minus its own vma to allow us to output a section through itself. */ s->bfd_section->output_offset = 0; get_userdata (s->bfd_section) = (PTR) new; /* If there is a base address, make sure that any sections it might mention are initialized. */ if (s->addr_tree != NULL) exp_init_os (s->addr_tree); } /* Make sure that all output sections mentioned in an expression are initialized. */ static void exp_init_os (exp) etree_type *exp; { switch (exp->type.node_class) { case etree_assign: exp_init_os (exp->assign.src); break; case etree_binary: exp_init_os (exp->binary.lhs); exp_init_os (exp->binary.rhs); break; case etree_trinary: exp_init_os (exp->trinary.cond); exp_init_os (exp->trinary.lhs); exp_init_os (exp->trinary.rhs); break; case etree_unary: exp_init_os (exp->unary.child); break; case etree_name: switch (exp->type.node_code) { case ADDR: case LOADADDR: case SIZEOF: { lang_output_section_statement_type *os; os = lang_output_section_find (exp->name.name); if (os != NULL && os->bfd_section == NULL) init_os (os); } } break; default: break; } } /* Sections marked with the SEC_LINK_ONCE flag should only be linked once into the output. This routine checks each section, and arrange to discard it if a section of the same name has already been linked. If the section has COMDAT information, then it uses that to decide whether the section should be included. This code assumes that all relevant sections have the SEC_LINK_ONCE flag set; that is, it does not depend solely upon the section name. section_already_linked is called via bfd_map_over_sections. */ /* This is the shape of the elements inside the already_linked hash table. It maps a name onto a list of already_linked elements with the same name. It's possible to get more than one element in a list if the COMDAT sections have different names. */ struct already_linked_hash_entry { struct bfd_hash_entry root; struct already_linked *entry; }; struct already_linked { struct already_linked *next; asection *sec; }; /* The hash table. */ static struct bfd_hash_table already_linked_table; static void section_already_linked (abfd, sec, data) bfd *abfd; asection *sec; PTR data; { lang_input_statement_type *entry = (lang_input_statement_type *) data; flagword flags; const char *name; struct already_linked *l; struct already_linked_hash_entry *already_linked_list; /* If we are only reading symbols from this object, then we want to discard all sections. */ if (entry->just_syms_flag) { bfd_link_just_syms (sec, &link_info); return; } flags = bfd_get_section_flags (abfd, sec); if ((flags & SEC_LINK_ONCE) == 0) return; /* FIXME: When doing a relocatable link, we may have trouble copying relocations in other sections that refer to local symbols in the section being discarded. Those relocations will have to be converted somehow; as of this writing I'm not sure that any of the backends handle that correctly. It is tempting to instead not discard link once sections when doing a relocatable link (technically, they should be discarded whenever we are building constructors). However, that fails, because the linker winds up combining all the link once sections into a single large link once section, which defeats the purpose of having link once sections in the first place. Also, not merging link once sections in a relocatable link causes trouble for MIPS ELF, which relies on link once semantics to handle the .reginfo section correctly. */ name = bfd_get_section_name (abfd, sec); already_linked_list = ((struct already_linked_hash_entry *) bfd_hash_lookup (&already_linked_table, name, true, false)); for (l = already_linked_list->entry; l != NULL; l = l->next) { if (sec->comdat == NULL || l->sec->comdat == NULL || strcmp (sec->comdat->name, l->sec->comdat->name) == 0) { /* The section has already been linked. See if we should issue a warning. */ switch (flags & SEC_LINK_DUPLICATES) { default: abort (); case SEC_LINK_DUPLICATES_DISCARD: break; case SEC_LINK_DUPLICATES_ONE_ONLY: if (sec->comdat == NULL) einfo (_("%P: %B: warning: ignoring duplicate section `%s'\n"), abfd, name); else einfo (_("%P: %B: warning: ignoring duplicate `%s' section symbol `%s'\n"), abfd, name, sec->comdat->name); break; case SEC_LINK_DUPLICATES_SAME_CONTENTS: /* FIXME: We should really dig out the contents of both sections and memcmp them. The COFF/PE spec says that the Microsoft linker does not implement this correctly, so I'm not going to bother doing it either. */ /* Fall through. */ case SEC_LINK_DUPLICATES_SAME_SIZE: if (bfd_section_size (abfd, sec) != bfd_section_size (l->sec->owner, l->sec)) einfo (_("%P: %B: warning: duplicate section `%s' has different size\n"), abfd, name); break; } /* Set the output_section field so that lang_add_section does not create a lang_input_section structure for this section. */ sec->output_section = bfd_abs_section_ptr; if (flags & SEC_GROUP) bfd_discard_group (abfd, sec); return; } } /* This is the first section with this name. Record it. Allocate the memory from the same obstack as the hash table is kept in. */ l = ((struct already_linked *) bfd_hash_allocate (&already_linked_table, sizeof *l)); l->sec = sec; l->next = already_linked_list->entry; already_linked_list->entry = l; } /* Support routines for the hash table used by section_already_linked, initialize the table, fill in an entry and remove the table. */ static struct bfd_hash_entry * already_linked_newfunc (entry, table, string) struct bfd_hash_entry *entry ATTRIBUTE_UNUSED; struct bfd_hash_table *table; const char *string ATTRIBUTE_UNUSED; { struct already_linked_hash_entry *ret = bfd_hash_allocate (table, sizeof (struct already_linked_hash_entry)); ret->entry = NULL; return (struct bfd_hash_entry *) ret; } static void already_linked_table_init () { if (! bfd_hash_table_init_n (&already_linked_table, already_linked_newfunc, 42)) einfo (_("%P%F: Failed to create hash table\n")); } static void already_linked_table_free () { bfd_hash_table_free (&already_linked_table); } /* The wild routines. These expand statements like *(.text) and foo.o to a list of explicit actions, like foo.o(.text), bar.o(.text) and foo.o(.text, .data). */ /* Return true if the PATTERN argument is a wildcard pattern. Although backslashes are treated specially if a pattern contains wildcards, we do not consider the mere presence of a backslash to be enough to cause the pattern to be treated as a wildcard. That lets us handle DOS filenames more naturally. */ static boolean wildcardp (pattern) const char *pattern; { const char *s; for (s = pattern; *s != '\0'; ++s) if (*s == '?' || *s == '*' || *s == '[') return true; return false; } /* Add SECTION to the output section OUTPUT. Do this by creating a lang_input_section statement which is placed at PTR. FILE is the input file which holds SECTION. */ void lang_add_section (ptr, section, output, file) lang_statement_list_type *ptr; asection *section; lang_output_section_statement_type *output; lang_input_statement_type *file; { flagword flags; boolean discard; flags = bfd_get_section_flags (section->owner, section); discard = false; /* If we are doing a final link, discard sections marked with SEC_EXCLUDE. */ if (! link_info.relocateable && (flags & SEC_EXCLUDE) != 0) discard = true; /* Discard input sections which are assigned to a section named DISCARD_SECTION_NAME. */ if (strcmp (output->name, DISCARD_SECTION_NAME) == 0) discard = true; /* Discard debugging sections if we are stripping debugging information. */ if ((link_info.strip == strip_debugger || link_info.strip == strip_all) && (flags & SEC_DEBUGGING) != 0) discard = true; if (discard) { if (section->output_section == NULL) { /* This prevents future calls from assigning this section. */ section->output_section = bfd_abs_section_ptr; } return; } if (section->output_section == NULL) { boolean first; lang_input_section_type *new; flagword flags; if (output->bfd_section == NULL) init_os (output); first = ! output->bfd_section->linker_has_input; output->bfd_section->linker_has_input = 1; /* Add a section reference to the list. */ new = new_stat (lang_input_section, ptr); new->section = section; new->ifile = file; section->output_section = output->bfd_section; flags = section->flags; /* We don't copy the SEC_NEVER_LOAD flag from an input section to an output section, because we want to be able to include a SEC_NEVER_LOAD section in the middle of an otherwise loaded section (I don't know why we want to do this, but we do). build_link_order in ldwrite.c handles this case by turning the embedded SEC_NEVER_LOAD section into a fill. */ flags &= ~ SEC_NEVER_LOAD; /* If final link, don't copy the SEC_LINK_ONCE flags, they've already been processed. One reason to do this is that on pe format targets, .text$foo sections go into .text and it's odd to see .text with SEC_LINK_ONCE set. */ if (! link_info.relocateable) flags &= ~ (SEC_LINK_ONCE | SEC_LINK_DUPLICATES); /* If this is not the first input section, and the SEC_READONLY flag is not currently set, then don't set it just because the input section has it set. */ if (! first && (section->output_section->flags & SEC_READONLY) == 0) flags &= ~ SEC_READONLY; /* Keep SEC_MERGE and SEC_STRINGS only if they are the same. */ if (! first && ((section->output_section->flags & (SEC_MERGE | SEC_STRINGS)) != (flags & (SEC_MERGE | SEC_STRINGS)) || ((flags & SEC_MERGE) && section->output_section->entsize != section->entsize))) { section->output_section->flags &= ~ (SEC_MERGE | SEC_STRINGS); flags &= ~ (SEC_MERGE | SEC_STRINGS); } /* For now make .tbss normal section. */ if ((flags & SEC_THREAD_LOCAL) && ! link_info.relocateable) flags |= SEC_LOAD; section->output_section->flags |= flags; if (flags & SEC_MERGE) section->output_section->entsize = section->entsize; /* If SEC_READONLY is not set in the input section, then clear it from the output section. */ if ((section->flags & SEC_READONLY) == 0) section->output_section->flags &= ~SEC_READONLY; switch (output->sectype) { case normal_section: break; case dsect_section: case copy_section: case info_section: case overlay_section: output->bfd_section->flags &= ~SEC_ALLOC; break; case noload_section: output->bfd_section->flags &= ~SEC_LOAD; output->bfd_section->flags |= SEC_NEVER_LOAD; break; } /* Copy over SEC_SMALL_DATA. */ if (section->flags & SEC_SMALL_DATA) section->output_section->flags |= SEC_SMALL_DATA; if (section->alignment_power > output->bfd_section->alignment_power) output->bfd_section->alignment_power = section->alignment_power; /* If supplied an aligment, then force it. */ if (output->section_alignment != -1) output->bfd_section->alignment_power = output->section_alignment; if (section->flags & SEC_BLOCK) { section->output_section->flags |= SEC_BLOCK; /* FIXME: This value should really be obtained from the bfd... */ output->block_value = 128; } } } /* Handle wildcard sorting. This returns the lang_input_section which should follow the one we are going to create for SECTION and FILE, based on the sorting requirements of WILD. It returns NULL if the new section should just go at the end of the current list. */ static lang_statement_union_type * wild_sort (wild, sec, file, section) lang_wild_statement_type *wild; struct wildcard_list *sec; lang_input_statement_type *file; asection *section; { const char *section_name; lang_statement_union_type *l; if (!wild->filenames_sorted && (sec == NULL || !sec->spec.sorted)) return NULL; section_name = bfd_get_section_name (file->the_bfd, section); for (l = wild->children.head; l != NULL; l = l->header.next) { lang_input_section_type *ls; if (l->header.type != lang_input_section_enum) continue; ls = &l->input_section; /* Sorting by filename takes precedence over sorting by section name. */ if (wild->filenames_sorted) { const char *fn, *ln; boolean fa, la; int i; /* The PE support for the .idata section as generated by dlltool assumes that files will be sorted by the name of the archive and then the name of the file within the archive. */ if (file->the_bfd != NULL && bfd_my_archive (file->the_bfd) != NULL) { fn = bfd_get_filename (bfd_my_archive (file->the_bfd)); fa = true; } else { fn = file->filename; fa = false; } if (ls->ifile->the_bfd != NULL && bfd_my_archive (ls->ifile->the_bfd) != NULL) { ln = bfd_get_filename (bfd_my_archive (ls->ifile->the_bfd)); la = true; } else { ln = ls->ifile->filename; la = false; } i = strcmp (fn, ln); if (i > 0) continue; else if (i < 0) break; if (fa || la) { if (fa) fn = file->filename; if (la) ln = ls->ifile->filename; i = strcmp (fn, ln); if (i > 0) continue; else if (i < 0) break; } } /* Here either the files are not sorted by name, or we are looking at the sections for this file. */ if (sec != NULL && sec->spec.sorted) { if (strcmp (section_name, bfd_get_section_name (ls->ifile->the_bfd, ls->section)) < 0) break; } } return l; } /* Expand a wild statement for a particular FILE. SECTION may be NULL, in which case it is a wild card. */ static void output_section_callback (ptr, sec, section, file, output) lang_wild_statement_type *ptr; struct wildcard_list *sec; asection *section; lang_input_statement_type *file; PTR output; { lang_statement_union_type *before; /* Exclude sections that match UNIQUE_SECTION_LIST. */ if (unique_section_p (bfd_get_section_name (file->the_bfd, section))) return; /* If the wild pattern was marked KEEP, the member sections should be as well. */ if (ptr->keep_sections) section->flags |= SEC_KEEP; before = wild_sort (ptr, sec, file, section); /* Here BEFORE points to the lang_input_section which should follow the one we are about to add. If BEFORE is NULL, then the section should just go at the end of the current list. */ if (before == NULL) lang_add_section (&ptr->children, section, (lang_output_section_statement_type *) output, file); else { lang_statement_list_type list; lang_statement_union_type **pp; lang_list_init (&list); lang_add_section (&list, section, (lang_output_section_statement_type *) output, file); /* If we are discarding the section, LIST.HEAD will be NULL. */ if (list.head != NULL) { ASSERT (list.head->header.next == NULL); for (pp = &ptr->children.head; *pp != before; pp = &(*pp)->header.next) ASSERT (*pp != NULL); list.head->header.next = *pp; *pp = list.head; } } } /* This is passed a file name which must have been seen already and added to the statement tree. We will see if it has been opened already and had its symbols read. If not then we'll read it. */ static lang_input_statement_type * lookup_name (name) const char *name; { lang_input_statement_type *search; for (search = (lang_input_statement_type *) input_file_chain.head; search != (lang_input_statement_type *) NULL; search = (lang_input_statement_type *) search->next_real_file) { if (search->filename == (char *) NULL && name == (char *) NULL) return search; if (search->filename != (char *) NULL && name != (char *) NULL && strcmp (search->filename, name) == 0) break; } if (search == (lang_input_statement_type *) NULL) search = new_afile (name, lang_input_file_is_file_enum, default_target, false); /* If we have already added this file, or this file is not real (FIXME: can that ever actually happen?) or the name is NULL (FIXME: can that ever actually happen?) don't add this file. */ if (search->loaded || ! search->real || search->filename == (const char *) NULL) return search; if (! load_symbols (search, (lang_statement_list_type *) NULL)) return NULL; return search; } /* Get the symbols for an input file. */ static boolean load_symbols (entry, place) lang_input_statement_type *entry; lang_statement_list_type *place; { char **matching; if (entry->loaded) return true; ldfile_open_file (entry); if (! bfd_check_format (entry->the_bfd, bfd_archive) && ! bfd_check_format_matches (entry->the_bfd, bfd_object, &matching)) { bfd_error_type err; lang_statement_list_type *hold; boolean bad_load = true; err = bfd_get_error (); /* See if the emulation has some special knowledge. */ if (ldemul_unrecognized_file (entry)) return true; if (err == bfd_error_file_ambiguously_recognized) { char **p; einfo (_("%B: file not recognized: %E\n"), entry->the_bfd); einfo (_("%B: matching formats:"), entry->the_bfd); for (p = matching; *p != NULL; p++) einfo (" %s", *p); einfo ("%F\n"); } else if (err != bfd_error_file_not_recognized || place == NULL) einfo (_("%F%B: file not recognized: %E\n"), entry->the_bfd); else bad_load = false; bfd_close (entry->the_bfd); entry->the_bfd = NULL; /* Try to interpret the file as a linker script. */ ldfile_open_command_file (entry->filename); hold = stat_ptr; stat_ptr = place; ldfile_assumed_script = true; parser_input = input_script; yyparse (); ldfile_assumed_script = false; stat_ptr = hold; return ! bad_load; } if (ldemul_recognized_file (entry)) return true; /* We don't call ldlang_add_file for an archive. Instead, the add_symbols entry point will call ldlang_add_file, via the add_archive_element callback, for each element of the archive which is used. */ switch (bfd_get_format (entry->the_bfd)) { default: break; case bfd_object: ldlang_add_file (entry); if (trace_files || trace_file_tries) info_msg ("%I\n", entry); break; case bfd_archive: if (entry->whole_archive) { bfd *member = NULL; boolean loaded = true; for (;;) { member = bfd_openr_next_archived_file (entry->the_bfd, member); if (member == NULL) break; if (! bfd_check_format (member, bfd_object)) { einfo (_("%F%B: member %B in archive is not an object\n"), entry->the_bfd, member); loaded = false; } if (! ((*link_info.callbacks->add_archive_element) (&link_info, member, "--whole-archive"))) abort (); if (! bfd_link_add_symbols (member, &link_info)) { einfo (_("%F%B: could not read symbols: %E\n"), member); loaded = false; } } entry->loaded = loaded; return loaded; } break; } if (bfd_link_add_symbols (entry->the_bfd, &link_info)) entry->loaded = true; else einfo (_("%F%B: could not read symbols: %E\n"), entry->the_bfd); return entry->loaded; } /* Handle a wild statement. S->FILENAME or S->SECTION_LIST or both may be NULL, indicating that it is a wildcard. Separate lang_input_section statements are created for each part of the expansion; they are added after the wild statement S. OUTPUT is the output section. */ static void wild (s, target, output) lang_wild_statement_type *s; const char *target ATTRIBUTE_UNUSED; lang_output_section_statement_type *output; { struct wildcard_list *sec; walk_wild (s, output_section_callback, (PTR) output); for (sec = s->section_list; sec != NULL; sec = sec->next) { if (default_common_section != NULL) break; if (sec->spec.name != NULL && strcmp (sec->spec.name, "COMMON") == 0) { /* Remember the section that common is going to in case we later get something which doesn't know where to put it. */ default_common_section = output; } } } /* Return true iff target is the sought target. */ static int get_target (target, data) const bfd_target *target; PTR data; { const char *sought = (const char *) data; return strcmp (target->name, sought) == 0; } /* Like strcpy() but convert to lower case as well. */ static void stricpy (dest, src) char *dest; char *src; { char c; while ((c = *src++) != 0) *dest++ = TOLOWER (c); *dest = 0; } /* Remove the first occurance of needle (if any) in haystack from haystack. */ static void strcut (haystack, needle) char *haystack; char *needle; { haystack = strstr (haystack, needle); if (haystack) { char *src; for (src = haystack + strlen (needle); *src;) *haystack++ = *src++; *haystack = 0; } } /* Compare two target format name strings. Return a value indicating how "similar" they are. */ static int name_compare (first, second) char *first; char *second; { char *copy1; char *copy2; int result; copy1 = xmalloc (strlen (first) + 1); copy2 = xmalloc (strlen (second) + 1); /* Convert the names to lower case. */ stricpy (copy1, first); stricpy (copy2, second); /* Remove and endian strings from the name. */ strcut (copy1, "big"); strcut (copy1, "little"); strcut (copy2, "big"); strcut (copy2, "little"); /* Return a value based on how many characters match, starting from the beginning. If both strings are the same then return 10 * their length. */ for (result = 0; copy1[result] == copy2[result]; result++) if (copy1[result] == 0) { result *= 10; break; } free (copy1); free (copy2); return result; } /* Set by closest_target_match() below. */ static const bfd_target *winner; /* Scan all the valid bfd targets looking for one that has the endianness requirement that was specified on the command line, and is the nearest match to the original output target. */ static int closest_target_match (target, data) const bfd_target *target; PTR data; { const bfd_target *original = (const bfd_target *) data; if (command_line.endian == ENDIAN_BIG && target->byteorder != BFD_ENDIAN_BIG) return 0; if (command_line.endian == ENDIAN_LITTLE && target->byteorder != BFD_ENDIAN_LITTLE) return 0; /* Must be the same flavour. */ if (target->flavour != original->flavour) return 0; /* If we have not found a potential winner yet, then record this one. */ if (winner == NULL) { winner = target; return 0; } /* Oh dear, we now have two potential candidates for a successful match. Compare their names and choose the better one. */ if (name_compare (target->name, original->name) > name_compare (winner->name, original->name)) winner = target; /* Keep on searching until wqe have checked them all. */ return 0; } /* Return the BFD target format of the first input file. */ static char * get_first_input_target () { char *target = NULL; LANG_FOR_EACH_INPUT_STATEMENT (s) { if (s->header.type == lang_input_statement_enum && s->real) { ldfile_open_file (s); if (s->the_bfd != NULL && bfd_check_format (s->the_bfd, bfd_object)) { target = bfd_get_target (s->the_bfd); if (target != NULL) break; } } } return target; } /* Open the output file. */ static bfd * open_output (name) const char *name; { bfd *output; /* Has the user told us which output format to use? */ if (output_target == (char *) NULL) { /* No - has the current target been set to something other than the default? */ if (current_target != default_target) output_target = current_target; /* No - can we determine the format of the first input file? */ else { output_target = get_first_input_target (); /* Failed - use the default output target. */ if (output_target == NULL) output_target = default_target; } } /* Has the user requested a particular endianness on the command line? */ if (command_line.endian != ENDIAN_UNSET) { const bfd_target *target; enum bfd_endian desired_endian; /* Get the chosen target. */ target = bfd_search_for_target (get_target, (PTR) output_target); /* If the target is not supported, we cannot do anything. */ if (target != NULL) { if (command_line.endian == ENDIAN_BIG) desired_endian = BFD_ENDIAN_BIG; else desired_endian = BFD_ENDIAN_LITTLE; /* See if the target has the wrong endianness. This should not happen if the linker script has provided big and little endian alternatives, but some scrips don't do this. */ if (target->byteorder != desired_endian) { /* If it does, then see if the target provides an alternative with the correct endianness. */ if (target->alternative_target != NULL && (target->alternative_target->byteorder == desired_endian)) output_target = target->alternative_target->name; else { /* Try to find a target as similar as possible to the default target, but which has the desired endian characteristic. */ (void) bfd_search_for_target (closest_target_match, (PTR) target); /* Oh dear - we could not find any targets that satisfy our requirements. */ if (winner == NULL) einfo (_("%P: warning: could not find any targets that match endianness requirement\n")); else output_target = winner->name; } } } } output = bfd_openw (name, output_target); if (output == (bfd *) NULL) { if (bfd_get_error () == bfd_error_invalid_target) einfo (_("%P%F: target %s not found\n"), output_target); einfo (_("%P%F: cannot open output file %s: %E\n"), name); } delete_output_file_on_failure = true; #if 0 output->flags |= D_PAGED; #endif if (! bfd_set_format (output, bfd_object)) einfo (_("%P%F:%s: can not make object file: %E\n"), name); if (! bfd_set_arch_mach (output, ldfile_output_architecture, ldfile_output_machine)) einfo (_("%P%F:%s: can not set architecture: %E\n"), name); link_info.hash = bfd_link_hash_table_create (output); if (link_info.hash == (struct bfd_link_hash_table *) NULL) einfo (_("%P%F: can not create link hash table: %E\n")); bfd_set_gp_size (output, g_switch_value); return output; } static void ldlang_open_output (statement) lang_statement_union_type *statement; { switch (statement->header.type) { case lang_output_statement_enum: ASSERT (output_bfd == (bfd *) NULL); output_bfd = open_output (statement->output_statement.name); ldemul_set_output_arch (); if (config.magic_demand_paged && !link_info.relocateable) output_bfd->flags |= D_PAGED; else output_bfd->flags &= ~D_PAGED; if (config.text_read_only) output_bfd->flags |= WP_TEXT; else output_bfd->flags &= ~WP_TEXT; if (link_info.traditional_format) output_bfd->flags |= BFD_TRADITIONAL_FORMAT; else output_bfd->flags &= ~BFD_TRADITIONAL_FORMAT; break; case lang_target_statement_enum: current_target = statement->target_statement.target; break; default: break; } } /* Open all the input files. */ static void open_input_bfds (s, force) lang_statement_union_type *s; boolean force; { for (; s != (lang_statement_union_type *) NULL; s = s->header.next) { switch (s->header.type) { case lang_constructors_statement_enum: open_input_bfds (constructor_list.head, force); break; case lang_output_section_statement_enum: open_input_bfds (s->output_section_statement.children.head, force); break; case lang_wild_statement_enum: /* Maybe we should load the file's symbols. */ if (s->wild_statement.filename && ! wildcardp (s->wild_statement.filename)) (void) lookup_name (s->wild_statement.filename); open_input_bfds (s->wild_statement.children.head, force); break; case lang_group_statement_enum: { struct bfd_link_hash_entry *undefs; /* We must continually search the entries in the group until no new symbols are added to the list of undefined symbols. */ do { undefs = link_info.hash->undefs_tail; open_input_bfds (s->group_statement.children.head, true); } while (undefs != link_info.hash->undefs_tail); } break; case lang_target_statement_enum: current_target = s->target_statement.target; break; case lang_input_statement_enum: if (s->input_statement.real) { lang_statement_list_type add; s->input_statement.target = current_target; /* If we are being called from within a group, and this is an archive which has already been searched, then force it to be researched unless the whole archive has been loaded already. */ if (force && !s->input_statement.whole_archive && s->input_statement.loaded && bfd_check_format (s->input_statement.the_bfd, bfd_archive)) s->input_statement.loaded = false; lang_list_init (&add); if (! load_symbols (&s->input_statement, &add)) config.make_executable = false; if (add.head != NULL) { *add.tail = s->header.next; s->header.next = add.head; } } break; default: break; } } } /* If there are [COMMONS] statements, put a wild one into the bss section. */ static void lang_reasonable_defaults () { #if 0 lang_output_section_statement_lookup (".text"); lang_output_section_statement_lookup (".data"); default_common_section = lang_output_section_statement_lookup (".bss"); if (placed_commons == false) { lang_wild_statement_type *new = new_stat (lang_wild_statement, &default_common_section->children); new->section_name = "COMMON"; new->filename = (char *) NULL; lang_list_init (&new->children); } #endif } /* Add the supplied name to the symbol table as an undefined reference. This is a two step process as the symbol table doesn't even exist at the time the ld command line is processed. First we put the name on a list, then, once the output file has been opened, transfer the name to the symbol table. */ typedef struct bfd_sym_chain ldlang_undef_chain_list_type; #define ldlang_undef_chain_list_head entry_symbol.next void ldlang_add_undef (name) const char *const name; { ldlang_undef_chain_list_type *new = ((ldlang_undef_chain_list_type *) stat_alloc (sizeof (ldlang_undef_chain_list_type))); new->next = ldlang_undef_chain_list_head; ldlang_undef_chain_list_head = new; new->name = xstrdup (name); if (output_bfd != NULL) insert_undefined (new->name); } /* Insert NAME as undefined in the symbol table. */ static void insert_undefined (name) const char *name; { struct bfd_link_hash_entry *h; h = bfd_link_hash_lookup (link_info.hash, name, true, false, true); if (h == (struct bfd_link_hash_entry *) NULL) einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n")); if (h->type == bfd_link_hash_new) { h->type = bfd_link_hash_undefined; h->u.undef.abfd = NULL; bfd_link_add_undef (link_info.hash, h); } } /* Run through the list of undefineds created above and place them into the linker hash table as undefined symbols belonging to the script file. */ static void lang_place_undefineds () { ldlang_undef_chain_list_type *ptr; for (ptr = ldlang_undef_chain_list_head; ptr != (ldlang_undef_chain_list_type *) NULL; ptr = ptr->next) { insert_undefined (ptr->name); } } /* Open input files and attatch to output sections. */ static void map_input_to_output_sections (s, target, output_section_statement) lang_statement_union_type *s; const char *target; lang_output_section_statement_type *output_section_statement; { for (; s != (lang_statement_union_type *) NULL; s = s->header.next) { switch (s->header.type) { case lang_wild_statement_enum: wild (&s->wild_statement, target, output_section_statement); break; case lang_constructors_statement_enum: map_input_to_output_sections (constructor_list.head, target, output_section_statement); break; case lang_output_section_statement_enum: map_input_to_output_sections (s->output_section_statement.children.head, target, &s->output_section_statement); break; case lang_output_statement_enum: break; case lang_target_statement_enum: target = s->target_statement.target; break; case lang_group_statement_enum: map_input_to_output_sections (s->group_statement.children.head, target, output_section_statement); break; case lang_fill_statement_enum: case lang_input_section_enum: case lang_object_symbols_statement_enum: case lang_data_statement_enum: case lang_reloc_statement_enum: case lang_padding_statement_enum: case lang_input_statement_enum: if (output_section_statement != NULL && output_section_statement->bfd_section == NULL) init_os (output_section_statement); break; case lang_assignment_statement_enum: if (output_section_statement != NULL && output_section_statement->bfd_section == NULL) init_os (output_section_statement); /* Make sure that any sections mentioned in the assignment are initialized. */ exp_init_os (s->assignment_statement.exp); break; case lang_afile_asection_pair_statement_enum: FAIL (); break; case lang_address_statement_enum: /* Mark the specified section with the supplied address. */ { lang_output_section_statement_type *os = lang_output_section_statement_lookup (s->address_statement.section_name); if (os->bfd_section == NULL) init_os (os); os->addr_tree = s->address_statement.address; } break; } } } /* An output section might have been removed after its statement was added. For example, ldemul_before_allocation can remove dynamic sections if they turn out to be not needed. Clean them up here. */ static void strip_excluded_output_sections () { lang_statement_union_type *u; for (u = lang_output_section_statement.head; u != NULL; u = u->output_section_statement.next) { lang_output_section_statement_type *os; asection *s; os = &u->output_section_statement; s = os->bfd_section; if (s != NULL && (s->flags & SEC_EXCLUDE) != 0) { asection **p; os->bfd_section = NULL; for (p = &output_bfd->sections; *p; p = &(*p)->next) if (*p == s) { bfd_section_list_remove (output_bfd, p); output_bfd->section_count--; break; } } } } static void print_output_section_statement (output_section_statement) lang_output_section_statement_type *output_section_statement; { asection *section = output_section_statement->bfd_section; int len; if (output_section_statement != abs_output_section) { minfo ("\n%s", output_section_statement->name); if (section != NULL) { print_dot = section->vma; len = strlen (output_section_statement->name); if (len >= SECTION_NAME_MAP_LENGTH - 1) { print_nl (); len = 0; } while (len < SECTION_NAME_MAP_LENGTH) { print_space (); ++len; } minfo ("0x%V %W", section->vma, section->_raw_size); if (output_section_statement->load_base != NULL) { bfd_vma addr; addr = exp_get_abs_int (output_section_statement->load_base, 0, "load base", lang_final_phase_enum); minfo (_(" load address 0x%V"), addr); } } print_nl (); } print_statement_list (output_section_statement->children.head, output_section_statement); } static void print_assignment (assignment, output_section) lang_assignment_statement_type *assignment; lang_output_section_statement_type *output_section; { int i; etree_value_type result; for (i = 0; i < SECTION_NAME_MAP_LENGTH; i++) print_space (); result = exp_fold_tree (assignment->exp->assign.src, output_section, lang_final_phase_enum, print_dot, &print_dot); if (result.valid_p) { const char *dst; bfd_vma value; value = result.value + result.section->bfd_section->vma; dst = assignment->exp->assign.dst; minfo ("0x%V", value); if (dst[0] == '.' && dst[1] == 0) print_dot = value; } else { minfo ("*undef* "); #ifdef BFD64 minfo (" "); #endif } minfo (" "); exp_print_tree (assignment->exp); print_nl (); } static void print_input_statement (statm) lang_input_statement_type *statm; { if (statm->filename != (char *) NULL) { fprintf (config.map_file, "LOAD %s\n", statm->filename); } } /* Print all symbols defined in a particular section. This is called via bfd_link_hash_traverse. */ static boolean print_one_symbol (hash_entry, ptr) struct bfd_link_hash_entry *hash_entry; PTR ptr; { asection *sec = (asection *) ptr; if ((hash_entry->type == bfd_link_hash_defined || hash_entry->type == bfd_link_hash_defweak) && sec == hash_entry->u.def.section) { int i; for (i = 0; i < SECTION_NAME_MAP_LENGTH; i++) print_space (); minfo ("0x%V ", (hash_entry->u.def.value + hash_entry->u.def.section->output_offset + hash_entry->u.def.section->output_section->vma)); minfo (" %T\n", hash_entry->root.string); } return true; } /* Print information about an input section to the map file. */ static void print_input_section (in) lang_input_section_type *in; { asection *i = in->section; bfd_size_type size = i->_cooked_size != 0 ? i->_cooked_size : i->_raw_size; unsigned opb = bfd_arch_mach_octets_per_byte (ldfile_output_architecture, ldfile_output_machine); if (size != 0) { print_space (); minfo ("%s", i->name); if (i->output_section != NULL) { int len; len = 1 + strlen (i->name); if (len >= SECTION_NAME_MAP_LENGTH - 1) { print_nl (); len = 0; } while (len < SECTION_NAME_MAP_LENGTH) { print_space (); ++len; } minfo ("0x%V %W %B\n", i->output_section->vma + i->output_offset, size / opb, i->owner); if (i->_cooked_size != 0 && i->_cooked_size != i->_raw_size) { len = SECTION_NAME_MAP_LENGTH + 3; #ifdef BFD64 len += 16; #else len += 8; #endif while (len > 0) { print_space (); --len; } minfo (_("%W (size before relaxing)\n"), i->_raw_size); } bfd_link_hash_traverse (link_info.hash, print_one_symbol, (PTR) i); print_dot = i->output_section->vma + i->output_offset + size / opb; } } } static void print_fill_statement (fill) lang_fill_statement_type *fill; { size_t size; unsigned char *p; fputs (" FILL mask 0x", config.map_file); for (p = fill->fill->data, size = fill->fill->size; size != 0; p++, size--) fprintf (config.map_file, "%02x", *p); fputs ("\n", config.map_file); } static void print_data_statement (data) lang_data_statement_type *data; { int i; bfd_vma addr; bfd_size_type size; const char *name; unsigned opb = bfd_arch_mach_octets_per_byte (ldfile_output_architecture, ldfile_output_machine); for (i = 0; i < SECTION_NAME_MAP_LENGTH; i++) print_space (); addr = data->output_vma; if (data->output_section != NULL) addr += data->output_section->vma; switch (data->type) { default: abort (); case BYTE: size = BYTE_SIZE; name = "BYTE"; break; case SHORT: size = SHORT_SIZE; name = "SHORT"; break; case LONG: size = LONG_SIZE; name = "LONG"; break; case QUAD: size = QUAD_SIZE; name = "QUAD"; break; case SQUAD: size = QUAD_SIZE; name = "SQUAD"; break; } minfo ("0x%V %W %s 0x%v", addr, size, name, data->value); if (data->exp->type.node_class != etree_value) { print_space (); exp_print_tree (data->exp); } print_nl (); print_dot = addr + size / opb; } /* Print an address statement. These are generated by options like -Ttext. */ static void print_address_statement (address) lang_address_statement_type *address; { minfo (_("Address of section %s set to "), address->section_name); exp_print_tree (address->address); print_nl (); } /* Print a reloc statement. */ static void print_reloc_statement (reloc) lang_reloc_statement_type *reloc; { int i; bfd_vma addr; bfd_size_type size; unsigned opb = bfd_arch_mach_octets_per_byte (ldfile_output_architecture, ldfile_output_machine); for (i = 0; i < SECTION_NAME_MAP_LENGTH; i++) print_space (); addr = reloc->output_vma; if (reloc->output_section != NULL) addr += reloc->output_section->vma; size = bfd_get_reloc_size (reloc->howto); minfo ("0x%V %W RELOC %s ", addr, size, reloc->howto->name); if (reloc->name != NULL) minfo ("%s+", reloc->name); else minfo ("%s+", reloc->section->name); exp_print_tree (reloc->addend_exp); print_nl (); print_dot = addr + size / opb; } static void print_padding_statement (s) lang_padding_statement_type *s; { int len; bfd_vma addr; unsigned opb = bfd_arch_mach_octets_per_byte (ldfile_output_architecture, ldfile_output_machine); minfo (" *fill*"); len = sizeof " *fill*" - 1; while (len < SECTION_NAME_MAP_LENGTH) { print_space (); ++len; } addr = s->output_offset; if (s->output_section != NULL) addr += s->output_section->vma; minfo ("0x%V %W ", addr, s->size); if (s->fill->size != 0) { size_t size; unsigned char *p; for (p = s->fill->data, size = s->fill->size; size != 0; p++, size--) fprintf (config.map_file, "%02x", *p); } print_nl (); print_dot = addr + s->size / opb; } static void print_wild_statement (w, os) lang_wild_statement_type *w; lang_output_section_statement_type *os; { struct wildcard_list *sec; print_space (); if (w->filenames_sorted) minfo ("SORT("); if (w->filename != NULL) minfo ("%s", w->filename); else minfo ("*"); if (w->filenames_sorted) minfo (")"); minfo ("("); for (sec = w->section_list; sec; sec = sec->next) { if (sec->spec.sorted) minfo ("SORT("); if (sec->spec.exclude_name_list != NULL) { name_list *tmp; minfo ("EXCLUDE_FILE(%s", sec->spec.exclude_name_list->name); for (tmp = sec->spec.exclude_name_list->next; tmp; tmp = tmp->next) minfo (" %s", tmp->name); minfo (") "); } if (sec->spec.name != NULL) minfo ("%s", sec->spec.name); else minfo ("*"); if (sec->spec.sorted) minfo (")"); if (sec->next) minfo (" "); } minfo (")"); print_nl (); print_statement_list (w->children.head, os); } /* Print a group statement. */ static void print_group (s, os) lang_group_statement_type *s; lang_output_section_statement_type *os; { fprintf (config.map_file, "START GROUP\n"); print_statement_list (s->children.head, os); fprintf (config.map_file, "END GROUP\n"); } /* Print the list of statements in S. This can be called for any statement type. */ static void print_statement_list (s, os) lang_statement_union_type *s; lang_output_section_statement_type *os; { while (s != NULL) { print_statement (s, os); s = s->header.next; } } /* Print the first statement in statement list S. This can be called for any statement type. */ static void print_statement (s, os) lang_statement_union_type *s; lang_output_section_statement_type *os; { switch (s->header.type) { default: fprintf (config.map_file, _("Fail with %d\n"), s->header.type); FAIL (); break; case lang_constructors_statement_enum: if (constructor_list.head != NULL) { if (constructors_sorted) minfo (" SORT (CONSTRUCTORS)\n"); else minfo (" CONSTRUCTORS\n"); print_statement_list (constructor_list.head, os); } break; case lang_wild_statement_enum: print_wild_statement (&s->wild_statement, os); break; case lang_address_statement_enum: print_address_statement (&s->address_statement); break; case lang_object_symbols_statement_enum: minfo (" CREATE_OBJECT_SYMBOLS\n"); break; case lang_fill_statement_enum: print_fill_statement (&s->fill_statement); break; case lang_data_statement_enum: print_data_statement (&s->data_statement); break; case lang_reloc_statement_enum: print_reloc_statement (&s->reloc_statement); break; case lang_input_section_enum: print_input_section (&s->input_section); break; case lang_padding_statement_enum: print_padding_statement (&s->padding_statement); break; case lang_output_section_statement_enum: print_output_section_statement (&s->output_section_statement); break; case lang_assignment_statement_enum: print_assignment (&s->assignment_statement, os); break; case lang_target_statement_enum: fprintf (config.map_file, "TARGET(%s)\n", s->target_statement.target); break; case lang_output_statement_enum: minfo ("OUTPUT(%s", s->output_statement.name); if (output_target != NULL) minfo (" %s", output_target); minfo (")\n"); break; case lang_input_statement_enum: print_input_statement (&s->input_statement); break; case lang_group_statement_enum: print_group (&s->group_statement, os); break; case lang_afile_asection_pair_statement_enum: FAIL (); break; } } static void print_statements () { print_statement_list (statement_list.head, abs_output_section); } /* Print the first N statements in statement list S to STDERR. If N == 0, nothing is printed. If N < 0, the entire list is printed. Intended to be called from GDB. */ void dprint_statement (s, n) lang_statement_union_type *s; int n; { FILE *map_save = config.map_file; config.map_file = stderr; if (n < 0) print_statement_list (s, abs_output_section); else { while (s && --n >= 0) { print_statement (s, abs_output_section); s = s->header.next; } } config.map_file = map_save; } static void insert_pad (ptr, fill, alignment_needed, output_section, dot) lang_statement_union_type **ptr; fill_type *fill; unsigned int alignment_needed; asection *output_section; bfd_vma dot; { static fill_type zero_fill = { 1, { 0 } }; lang_statement_union_type *pad; pad = ((lang_statement_union_type *) ((char *) ptr - offsetof (lang_statement_union_type, header.next))); if (ptr != &statement_list.head && pad->header.type == lang_padding_statement_enum && pad->padding_statement.output_section == output_section) { /* Use the existing pad statement. The above test on output section is probably redundant, but it doesn't hurt to check. */ } else { /* Make a new padding statement, linked into existing chain. */ pad = ((lang_statement_union_type *) stat_alloc (sizeof (lang_padding_statement_type))); pad->header.next = *ptr; *ptr = pad; pad->header.type = lang_padding_statement_enum; pad->padding_statement.output_section = output_section; if (fill == (fill_type *) 0) fill = &zero_fill; pad->padding_statement.fill = fill; } pad->padding_statement.output_offset = dot - output_section->vma; pad->padding_statement.size = alignment_needed; output_section->_raw_size += alignment_needed; } /* Work out how much this section will move the dot point. */ static bfd_vma size_input_section (this_ptr, output_section_statement, fill, dot) lang_statement_union_type **this_ptr; lang_output_section_statement_type *output_section_statement; fill_type *fill; bfd_vma dot; { lang_input_section_type *is = &((*this_ptr)->input_section); asection *i = is->section; if (is->ifile->just_syms_flag == false) { unsigned opb = bfd_arch_mach_octets_per_byte (ldfile_output_architecture, ldfile_output_machine); unsigned int alignment_needed; asection *o; /* Align this section first to the input sections requirement, then to the output section's requirement. If this alignment is greater than any seen before, then record it too. Perform the alignment by inserting a magic 'padding' statement. */ if (output_section_statement->subsection_alignment != -1) i->alignment_power = output_section_statement->subsection_alignment; o = output_section_statement->bfd_section; if (o->alignment_power < i->alignment_power) o->alignment_power = i->alignment_power; alignment_needed = align_power (dot, i->alignment_power) - dot; if (alignment_needed != 0) { insert_pad (this_ptr, fill, alignment_needed * opb, o, dot); dot += alignment_needed; } /* Remember where in the output section this input section goes. */ i->output_offset = dot - o->vma; /* Mark how big the output section must be to contain this now. */ if (i->_cooked_size != 0) dot += i->_cooked_size / opb; else dot += i->_raw_size / opb; o->_raw_size = (dot - o->vma) * opb; } else { i->output_offset = i->vma - output_section_statement->bfd_section->vma; } return dot; } #define IGNORE_SECTION(bfd, s) \ (((bfd_get_section_flags (bfd, s) & (SEC_ALLOC | SEC_LOAD)) \ != (SEC_ALLOC | SEC_LOAD)) \ || bfd_section_size (bfd, s) == 0) /* Check to see if any allocated sections overlap with other allocated sections. This can happen when the linker script specifically specifies the output section addresses of the two sections. */ static void lang_check_section_addresses () { asection *s; unsigned opb = bfd_octets_per_byte (output_bfd); /* Scan all sections in the output list. */ for (s = output_bfd->sections; s != NULL; s = s->next) { asection *os; /* Ignore sections which are not loaded or which have no contents. */ if (IGNORE_SECTION (output_bfd, s)) continue; /* Once we reach section 's' stop our seach. This prevents two warning messages from being produced, one for 'section A overlaps section B' and one for 'section B overlaps section A'. */ for (os = output_bfd->sections; os != s; os = os->next) { bfd_vma s_start; bfd_vma s_end; bfd_vma os_start; bfd_vma os_end; /* Only consider loadable sections with real contents. */ if (IGNORE_SECTION (output_bfd, os)) continue; /* We must check the sections' LMA addresses not their VMA addresses because overlay sections can have overlapping VMAs but they must have distinct LMAs. */ s_start = bfd_section_lma (output_bfd, s); os_start = bfd_section_lma (output_bfd, os); s_end = s_start + bfd_section_size (output_bfd, s) / opb - 1; os_end = os_start + bfd_section_size (output_bfd, os) / opb - 1; /* Look for an overlap. */ if ((s_end < os_start) || (s_start > os_end)) continue; einfo ( _("%X%P: section %s [%V -> %V] overlaps section %s [%V -> %V]\n"), s->name, s_start, s_end, os->name, os_start, os_end); /* Once we have found one overlap for this section, stop looking for others. */ break; } } } /* Make sure the new address is within the region. We explicitly permit the current address to be at the exact end of the region when the address is non-zero, in case the region is at the end of addressable memory and the calculation wraps around. */ static void os_region_check (os, region, tree, base) lang_output_section_statement_type *os; struct memory_region_struct *region; etree_type *tree; bfd_vma base; { if ((region->current < region->origin || (region->current - region->origin > region->length)) && ((region->current != region->origin + region->length) || base == 0)) { if (tree != (etree_type *) NULL) { einfo (_("%X%P: address 0x%v of %B section %s is not within region %s\n"), region->current, os->bfd_section->owner, os->bfd_section->name, region->name); } else { einfo (_("%X%P: region %s is full (%B section %s)\n"), region->name, os->bfd_section->owner, os->bfd_section->name); } /* Reset the region pointer. */ region->current = region->origin; } } /* Set the sizes for all the output sections. */ static bfd_vma lang_size_sections_1 (s, output_section_statement, prev, fill, dot, relax) lang_statement_union_type *s; lang_output_section_statement_type *output_section_statement; lang_statement_union_type **prev; fill_type *fill; bfd_vma dot; boolean *relax; { unsigned opb = bfd_arch_mach_octets_per_byte (ldfile_output_architecture, ldfile_output_machine); /* Size up the sections from their constituent parts. */ for (; s != (lang_statement_union_type *) NULL; s = s->header.next) { switch (s->header.type) { case lang_output_section_statement_enum: { bfd_vma after; lang_output_section_statement_type *os; os = &s->output_section_statement; if (os->bfd_section == NULL) /* This section was never actually created. */ break; /* If this is a COFF shared library section, use the size and address from the input section. FIXME: This is COFF specific; it would be cleaner if there were some other way to do this, but nothing simple comes to mind. */ if ((os->bfd_section->flags & SEC_COFF_SHARED_LIBRARY) != 0) { asection *input; if (os->children.head == NULL || os->children.head->header.next != NULL || os->children.head->header.type != lang_input_section_enum) einfo (_("%P%X: Internal error on COFF shared library section %s\n"), os->name); input = os->children.head->input_section.section; bfd_set_section_vma (os->bfd_section->owner, os->bfd_section, bfd_section_vma (input->owner, input)); os->bfd_section->_raw_size = input->_raw_size; break; } if (bfd_is_abs_section (os->bfd_section)) { /* No matter what happens, an abs section starts at zero. */ ASSERT (os->bfd_section->vma == 0); } else { if (os->addr_tree == (etree_type *) NULL) { /* No address specified for this section, get one from the region specification. */ if (os->region == (lang_memory_region_type *) NULL || (((bfd_get_section_flags (output_bfd, os->bfd_section) & (SEC_ALLOC | SEC_LOAD)) != 0) && os->region->name[0] == '*' && strcmp (os->region->name, "*default*") == 0)) { os->region = lang_memory_default (os->bfd_section); } /* If a loadable section is using the default memory region, and some non default memory regions were defined, issue a warning. */ if ((bfd_get_section_flags (output_bfd, os->bfd_section) & (SEC_ALLOC | SEC_LOAD)) != 0 && (bfd_get_section_flags (output_bfd, os->bfd_section) & SEC_NEVER_LOAD) == 0 && ! link_info.relocateable && strcmp (os->region->name, "*default*") == 0 && lang_memory_region_list != NULL && (strcmp (lang_memory_region_list->name, "*default*") != 0 || lang_memory_region_list->next != NULL)) einfo (_("%P: warning: no memory region specified for section `%s'\n"), bfd_get_section_name (output_bfd, os->bfd_section)); dot = os->region->current; if (os->section_alignment == -1) { bfd_vma olddot; olddot = dot; dot = align_power (dot, os->bfd_section->alignment_power); if (dot != olddot && config.warn_section_align) einfo (_("%P: warning: changing start of section %s by %u bytes\n"), os->name, (unsigned int) (dot - olddot)); } } else { etree_value_type r; r = exp_fold_tree (os->addr_tree, abs_output_section, lang_allocating_phase_enum, dot, &dot); if (r.valid_p == false) { einfo (_("%F%S: non constant address expression for section %s\n"), os->name); } dot = r.value + r.section->bfd_section->vma; } /* The section starts here. First, align to what the section needs. */ if (os->section_alignment != -1) dot = align_power (dot, os->section_alignment); bfd_set_section_vma (0, os->bfd_section, dot); os->bfd_section->output_offset = 0; } lang_size_sections_1 (os->children.head, os, &os->children.head, os->fill, dot, relax); /* Put the section within the requested block size, or align at the block boundary. */ after = align_n (os->bfd_section->vma + os->bfd_section->_raw_size / opb, (bfd_vma) os->block_value); if (bfd_is_abs_section (os->bfd_section)) ASSERT (after == os->bfd_section->vma); else if ((os->bfd_section->flags & SEC_HAS_CONTENTS) == 0 && (os->bfd_section->flags & SEC_THREAD_LOCAL) && ! link_info.relocateable) os->bfd_section->_raw_size = 0; else os->bfd_section->_raw_size = (after - os->bfd_section->vma) * opb; dot = os->bfd_section->vma + os->bfd_section->_raw_size / opb; os->processed = true; if (os->update_dot_tree != 0) exp_fold_tree (os->update_dot_tree, abs_output_section, lang_allocating_phase_enum, dot, &dot); /* Update dot in the region ? We only do this if the section is going to be allocated, since unallocated sections do not contribute to the region's overall size in memory. If the SEC_NEVER_LOAD bit is not set, it will affect the addresses of sections after it. We have to update dot. */ if (os->region != (lang_memory_region_type *) NULL && ((bfd_get_section_flags (output_bfd, os->bfd_section) & SEC_NEVER_LOAD) == 0 || (bfd_get_section_flags (output_bfd, os->bfd_section) & (SEC_ALLOC | SEC_LOAD)))) { os->region->current = dot; /* Make sure the new address is within the region. */ os_region_check (os, os->region, os->addr_tree, os->bfd_section->vma); /* If there's no load address specified, use the run region as the load region. */ if (os->lma_region == NULL && os->load_base == NULL) os->lma_region = os->region; if (os->lma_region != NULL && os->lma_region != os->region) { /* Set load_base, which will be handled later. */ os->load_base = exp_intop (os->lma_region->current); os->lma_region->current += os->bfd_section->_raw_size / opb; os_region_check (os, os->lma_region, NULL, os->bfd_section->lma); } } } break; case lang_constructors_statement_enum: dot = lang_size_sections_1 (constructor_list.head, output_section_statement, &s->wild_statement.children.head, fill, dot, relax); break; case lang_data_statement_enum: { unsigned int size = 0; s->data_statement.output_vma = dot - output_section_statement->bfd_section->vma; s->data_statement.output_section = output_section_statement->bfd_section; switch (s->data_statement.type) { default: abort (); case QUAD: case SQUAD: size = QUAD_SIZE; break; case LONG: size = LONG_SIZE; break; case SHORT: size = SHORT_SIZE; break; case BYTE: size = BYTE_SIZE; break; } if (size < opb) size = opb; dot += size / opb; output_section_statement->bfd_section->_raw_size += size; /* The output section gets contents, and then we inspect for any flags set in the input script which override any ALLOC. */ output_section_statement->bfd_section->flags |= SEC_HAS_CONTENTS; if (!(output_section_statement->flags & SEC_NEVER_LOAD)) { output_section_statement->bfd_section->flags |= SEC_ALLOC | SEC_LOAD; } } break; case lang_reloc_statement_enum: { int size; s->reloc_statement.output_vma = dot - output_section_statement->bfd_section->vma; s->reloc_statement.output_section = output_section_statement->bfd_section; size = bfd_get_reloc_size (s->reloc_statement.howto); dot += size / opb; output_section_statement->bfd_section->_raw_size += size; } break; case lang_wild_statement_enum: dot = lang_size_sections_1 (s->wild_statement.children.head, output_section_statement, &s->wild_statement.children.head, fill, dot, relax); break; case lang_object_symbols_statement_enum: link_info.create_object_symbols_section = output_section_statement->bfd_section; break; case lang_output_statement_enum: case lang_target_statement_enum: break; case lang_input_section_enum: { asection *i; i = (*prev)->input_section.section; if (! relax) { if (i->_cooked_size == 0) i->_cooked_size = i->_raw_size; } else { boolean again; if (! bfd_relax_section (i->owner, i, &link_info, &again)) einfo (_("%P%F: can't relax section: %E\n")); if (again) *relax = true; } dot = size_input_section (prev, output_section_statement, output_section_statement->fill, dot); } break; case lang_input_statement_enum: break; case lang_fill_statement_enum: s->fill_statement.output_section = output_section_statement->bfd_section; fill = s->fill_statement.fill; break; case lang_assignment_statement_enum: { bfd_vma newdot = dot; exp_fold_tree (s->assignment_statement.exp, output_section_statement, lang_allocating_phase_enum, dot, &newdot); if (newdot != dot) { if (output_section_statement == abs_output_section) { /* If we don't have an output section, then just adjust the default memory address. */ lang_memory_region_lookup ("*default*")->current = newdot; } else { /* Insert a pad after this statement. We can't put the pad before when relaxing, in case the assignment references dot. */ insert_pad (&s->header.next, fill, (newdot - dot) * opb, output_section_statement->bfd_section, dot); /* Don't neuter the pad below when relaxing. */ s = s->header.next; } dot = newdot; } } break; case lang_padding_statement_enum: /* If this is the first time lang_size_sections is called, we won't have any padding statements. If this is the second or later passes when relaxing, we should allow padding to shrink. If padding is needed on this pass, it will be added back in. */ s->padding_statement.size = 0; /* Make sure output_offset is valid. If relaxation shrinks the section and this pad isn't needed, it's possible to have output_offset larger than the final size of the section. bfd_set_section_contents will complain even for a pad size of zero. */ s->padding_statement.output_offset = dot - output_section_statement->bfd_section->vma; break; case lang_group_statement_enum: dot = lang_size_sections_1 (s->group_statement.children.head, output_section_statement, &s->group_statement.children.head, fill, dot, relax); break; default: FAIL (); break; /* We can only get here when relaxing is turned on. */ case lang_address_statement_enum: break; } prev = &s->header.next; } return dot; } bfd_vma lang_size_sections (s, output_section_statement, prev, fill, dot, relax) lang_statement_union_type *s; lang_output_section_statement_type *output_section_statement; lang_statement_union_type **prev; fill_type *fill; bfd_vma dot; boolean *relax; { bfd_vma result; exp_data_seg.phase = exp_dataseg_none; result = lang_size_sections_1 (s, output_section_statement, prev, fill, dot, relax); if (exp_data_seg.phase == exp_dataseg_end_seen) { /* If DATA_SEGMENT_ALIGN DATA_SEGMENT_END pair was seen, check whether a page could be saved in the data segment. */ bfd_vma first, last; first = -exp_data_seg.base & (exp_data_seg.pagesize - 1); last = exp_data_seg.end & (exp_data_seg.pagesize - 1); if (first && last && ((exp_data_seg.base & ~(exp_data_seg.pagesize - 1)) != (exp_data_seg.end & ~(exp_data_seg.pagesize - 1))) && first + last <= exp_data_seg.pagesize) { exp_data_seg.phase = exp_dataseg_adjust; result = lang_size_sections_1 (s, output_section_statement, prev, fill, dot, relax); } } return result; } bfd_vma lang_do_assignments (s, output_section_statement, fill, dot) lang_statement_union_type *s; lang_output_section_statement_type *output_section_statement; fill_type *fill; bfd_vma dot; { unsigned opb = bfd_arch_mach_octets_per_byte (ldfile_output_architecture, ldfile_output_machine); for (; s != (lang_statement_union_type *) NULL; s = s->header.next) { switch (s->header.type) { case lang_constructors_statement_enum: dot = lang_do_assignments (constructor_list.head, output_section_statement, fill, dot); break; case lang_output_section_statement_enum: { lang_output_section_statement_type *os; os = &(s->output_section_statement); if (os->bfd_section != NULL) { dot = os->bfd_section->vma; (void) lang_do_assignments (os->children.head, os, os->fill, dot); dot = os->bfd_section->vma + os->bfd_section->_raw_size / opb; } if (os->load_base) { /* If nothing has been placed into the output section then it won't have a bfd_section. */ if (os->bfd_section) { os->bfd_section->lma = exp_get_abs_int (os->load_base, 0, "load base", lang_final_phase_enum); } } } break; case lang_wild_statement_enum: dot = lang_do_assignments (s->wild_statement.children.head, output_section_statement, fill, dot); break; case lang_object_symbols_statement_enum: case lang_output_statement_enum: case lang_target_statement_enum: #if 0 case lang_common_statement_enum: #endif break; case lang_data_statement_enum: { etree_value_type value; value = exp_fold_tree (s->data_statement.exp, abs_output_section, lang_final_phase_enum, dot, &dot); s->data_statement.value = value.value; if (value.valid_p == false) einfo (_("%F%P: invalid data statement\n")); } { unsigned int size; switch (s->data_statement.type) { default: abort (); case QUAD: case SQUAD: size = QUAD_SIZE; break; case LONG: size = LONG_SIZE; break; case SHORT: size = SHORT_SIZE; break; case BYTE: size = BYTE_SIZE; break; } if (size < opb) size = opb; dot += size / opb; } break; case lang_reloc_statement_enum: { etree_value_type value; value = exp_fold_tree (s->reloc_statement.addend_exp, abs_output_section, lang_final_phase_enum, dot, &dot); s->reloc_statement.addend_value = value.value; if (value.valid_p == false) einfo (_("%F%P: invalid reloc statement\n")); } dot += bfd_get_reloc_size (s->reloc_statement.howto) / opb; break; case lang_input_section_enum: { asection *in = s->input_section.section; if (in->_cooked_size != 0) dot += in->_cooked_size / opb; else dot += in->_raw_size / opb; } break; case lang_input_statement_enum: break; case lang_fill_statement_enum: fill = s->fill_statement.fill; break; case lang_assignment_statement_enum: { exp_fold_tree (s->assignment_statement.exp, output_section_statement, lang_final_phase_enum, dot, &dot); } break; case lang_padding_statement_enum: dot += s->padding_statement.size / opb; break; case lang_group_statement_enum: dot = lang_do_assignments (s->group_statement.children.head, output_section_statement, fill, dot); break; default: FAIL (); break; case lang_address_statement_enum: break; } } return dot; } /* Fix any .startof. or .sizeof. symbols. When the assemblers see the operator .startof. (section_name), it produces an undefined symbol .startof.section_name. Similarly, when it sees .sizeof. (section_name), it produces an undefined symbol .sizeof.section_name. For all the output sections, we look for such symbols, and set them to the correct value. */ static void lang_set_startof () { asection *s; if (link_info.relocateable) return; for (s = output_bfd->sections; s != NULL; s = s->next) { const char *secname; char *buf; struct bfd_link_hash_entry *h; secname = bfd_get_section_name (output_bfd, s); buf = xmalloc (10 + strlen (secname)); sprintf (buf, ".startof.%s", secname); h = bfd_link_hash_lookup (link_info.hash, buf, false, false, true); if (h != NULL && h->type == bfd_link_hash_undefined) { h->type = bfd_link_hash_defined; h->u.def.value = bfd_get_section_vma (output_bfd, s); h->u.def.section = bfd_abs_section_ptr; } sprintf (buf, ".sizeof.%s", secname); h = bfd_link_hash_lookup (link_info.hash, buf, false, false, true); if (h != NULL && h->type == bfd_link_hash_undefined) { unsigned opb; opb = bfd_arch_mach_octets_per_byte (ldfile_output_architecture, ldfile_output_machine); h->type = bfd_link_hash_defined; if (s->_cooked_size != 0) h->u.def.value = s->_cooked_size / opb; else h->u.def.value = s->_raw_size / opb; h->u.def.section = bfd_abs_section_ptr; } free (buf); } } static void lang_finish () { struct bfd_link_hash_entry *h; boolean warn; if (link_info.relocateable || link_info.shared) warn = false; else warn = true; if (entry_symbol.name == (const char *) NULL) { /* No entry has been specified. Look for start, but don't warn if we don't find it. */ entry_symbol.name = "start"; warn = false; } h = bfd_link_hash_lookup (link_info.hash, entry_symbol.name, false, false, true); if (h != (struct bfd_link_hash_entry *) NULL && (h->type == bfd_link_hash_defined || h->type == bfd_link_hash_defweak) && h->u.def.section->output_section != NULL) { bfd_vma val; val = (h->u.def.value + bfd_get_section_vma (output_bfd, h->u.def.section->output_section) + h->u.def.section->output_offset); if (! bfd_set_start_address (output_bfd, val)) einfo (_("%P%F:%s: can't set start address\n"), entry_symbol.name); } else { bfd_vma val; const char *send; /* We couldn't find the entry symbol. Try parsing it as a number. */ val = bfd_scan_vma (entry_symbol.name, &send, 0); if (*send == '\0') { if (! bfd_set_start_address (output_bfd, val)) einfo (_("%P%F: can't set start address\n")); } else { asection *ts; /* Can't find the entry symbol, and it's not a number. Use the first address in the text section. */ ts = bfd_get_section_by_name (output_bfd, entry_section); if (ts != (asection *) NULL) { if (warn) einfo (_("%P: warning: cannot find entry symbol %s; defaulting to %V\n"), entry_symbol.name, bfd_get_section_vma (output_bfd, ts)); if (! bfd_set_start_address (output_bfd, bfd_get_section_vma (output_bfd, ts))) einfo (_("%P%F: can't set start address\n")); } else { if (warn) einfo (_("%P: warning: cannot find entry symbol %s; not setting start address\n"), entry_symbol.name); } } } } /* This is a small function used when we want to ignore errors from BFD. */ static void #ifdef ANSI_PROTOTYPES ignore_bfd_errors (const char *s ATTRIBUTE_UNUSED, ...) #else ignore_bfd_errors (s) const char *s ATTRIBUTE_UNUSED; #endif { /* Don't do anything. */ } /* Check that the architecture of all the input files is compatible with the output file. Also call the backend to let it do any other checking that is needed. */ static void lang_check () { lang_statement_union_type *file; bfd *input_bfd; const bfd_arch_info_type *compatible; for (file = file_chain.head; file != (lang_statement_union_type *) NULL; file = file->input_statement.next) { input_bfd = file->input_statement.the_bfd; compatible = bfd_arch_get_compatible (input_bfd, output_bfd); /* In general it is not possible to perform a relocatable link between differing object formats when the input file has relocations, because the relocations in the input format may not have equivalent representations in the output format (and besides BFD does not translate relocs for other link purposes than a final link). */ if ((link_info.relocateable || link_info.emitrelocations) && (compatible == NULL || bfd_get_flavour (input_bfd) != bfd_get_flavour (output_bfd)) && (bfd_get_file_flags (input_bfd) & HAS_RELOC) != 0) { einfo (_("%P%F: Relocatable linking with relocations from format %s (%B) to format %s (%B) is not supported\n"), bfd_get_target (input_bfd), input_bfd, bfd_get_target (output_bfd), output_bfd); /* einfo with %F exits. */ } if (compatible == NULL) { if (command_line.warn_mismatch) einfo (_("%P: warning: %s architecture of input file `%B' is incompatible with %s output\n"), bfd_printable_name (input_bfd), input_bfd, bfd_printable_name (output_bfd)); } else if (bfd_count_sections (input_bfd)) { /* If the input bfd has no contents, it shouldn't set the private data of the output bfd. */ bfd_error_handler_type pfn = NULL; /* If we aren't supposed to warn about mismatched input files, temporarily set the BFD error handler to a function which will do nothing. We still want to call bfd_merge_private_bfd_data, since it may set up information which is needed in the output file. */ if (! command_line.warn_mismatch) pfn = bfd_set_error_handler (ignore_bfd_errors); if (! bfd_merge_private_bfd_data (input_bfd, output_bfd)) { if (command_line.warn_mismatch) einfo (_("%E%X: failed to merge target specific data of file %B\n"), input_bfd); } if (! command_line.warn_mismatch) bfd_set_error_handler (pfn); } } } /* Look through all the global common symbols and attach them to the correct section. The -sort-common command line switch may be used to roughly sort the entries by size. */ static void lang_common () { if (command_line.inhibit_common_definition) return; if (link_info.relocateable && ! command_line.force_common_definition) return; if (! config.sort_common) bfd_link_hash_traverse (link_info.hash, lang_one_common, (PTR) NULL); else { int power; for (power = 4; power >= 0; power--) bfd_link_hash_traverse (link_info.hash, lang_one_common, (PTR) &power); } } /* Place one common symbol in the correct section. */ static boolean lang_one_common (h, info) struct bfd_link_hash_entry *h; PTR info; { unsigned int power_of_two; bfd_vma size; asection *section; unsigned opb = bfd_arch_mach_octets_per_byte (ldfile_output_architecture, ldfile_output_machine); if (h->type != bfd_link_hash_common) return true; size = h->u.c.size; power_of_two = h->u.c.p->alignment_power; if (config.sort_common && power_of_two < (unsigned int) *(int *) info) return true; section = h->u.c.p->section; /* Increase the size of the section. */ section->_cooked_size = align_n ((section->_cooked_size + opb - 1) / opb, (bfd_vma) 1 << power_of_two) * opb; /* Adjust the alignment if necessary. */ if (power_of_two > section->alignment_power) section->alignment_power = power_of_two; /* Change the symbol from common to defined. */ h->type = bfd_link_hash_defined; h->u.def.section = section; h->u.def.value = section->_cooked_size; /* Increase the size of the section. */ section->_cooked_size += size; /* Make sure the section is allocated in memory, and make sure that it is no longer a common section. */ section->flags |= SEC_ALLOC; section->flags &= ~SEC_IS_COMMON; if (config.map_file != NULL) { static boolean header_printed; int len; char *name; char buf[50]; if (! header_printed) { minfo (_("\nAllocating common symbols\n")); minfo (_("Common symbol size file\n\n")); header_printed = true; } name = demangle (h->root.string); minfo ("%s", name); len = strlen (name); free (name); if (len >= 19) { print_nl (); len = 0; } while (len < 20) { print_space (); ++len; } minfo ("0x"); if (size <= 0xffffffff) sprintf (buf, "%lx", (unsigned long) size); else sprintf_vma (buf, size); minfo ("%s", buf); len = strlen (buf); while (len < 16) { print_space (); ++len; } minfo ("%B\n", section->owner); } return true; } /* Run through the input files and ensure that every input section has somewhere to go. If one is found without a destination then create an input request and place it into the statement tree. */ static void lang_place_orphans () { LANG_FOR_EACH_INPUT_STATEMENT (file) { asection *s; for (s = file->the_bfd->sections; s != (asection *) NULL; s = s->next) { if (s->output_section == (asection *) NULL) { /* This section of the file is not attatched, root around for a sensible place for it to go. */ if (file->just_syms_flag) { abort (); } else if (strcmp (s->name, "COMMON") == 0) { /* This is a lonely common section which must have come from an archive. We attach to the section with the wildcard. */ if (! link_info.relocateable || command_line.force_common_definition) { if (default_common_section == NULL) { #if 0 /* This message happens when using the svr3.ifile linker script, so I have disabled it. */ info_msg (_("%P: no [COMMON] command, defaulting to .bss\n")); #endif default_common_section = lang_output_section_statement_lookup (".bss"); } lang_add_section (&default_common_section->children, s, default_common_section, file); } } else if (ldemul_place_orphan (file, s)) ; else { lang_output_section_statement_type *os; os = lang_output_section_statement_lookup (s->name); lang_add_section (&os->children, s, os, file); } } } } } void lang_set_flags (ptr, flags, invert) lang_memory_region_type *ptr; const char *flags; int invert; { flagword *ptr_flags; ptr_flags = invert ? &ptr->not_flags : &ptr->flags; while (*flags) { switch (*flags) { case 'A': case 'a': *ptr_flags |= SEC_ALLOC; break; case 'R': case 'r': *ptr_flags |= SEC_READONLY; break; case 'W': case 'w': *ptr_flags |= SEC_DATA; break; case 'X': case 'x': *ptr_flags |= SEC_CODE; break; case 'L': case 'l': case 'I': case 'i': *ptr_flags |= SEC_LOAD; break; default: einfo (_("%P%F: invalid syntax in flags\n")); break; } flags++; } } /* Call a function on each input file. This function will be called on an archive, but not on the elements. */ void lang_for_each_input_file (func) void (*func) PARAMS ((lang_input_statement_type *)); { lang_input_statement_type *f; for (f = (lang_input_statement_type *) input_file_chain.head; f != NULL; f = (lang_input_statement_type *) f->next_real_file) func (f); } /* Call a function on each file. The function will be called on all the elements of an archive which are included in the link, but will not be called on the archive file itself. */ void lang_for_each_file (func) void (*func) PARAMS ((lang_input_statement_type *)); { LANG_FOR_EACH_INPUT_STATEMENT (f) { func (f); } } #if 0 /* Not used. */ void lang_for_each_input_section (func) void (*func) PARAMS ((bfd *ab, asection *as)); { LANG_FOR_EACH_INPUT_STATEMENT (f) { asection *s; for (s = f->the_bfd->sections; s != (asection *) NULL; s = s->next) { func (f->the_bfd, s); } } } #endif void ldlang_add_file (entry) lang_input_statement_type *entry; { bfd **pp; lang_statement_append (&file_chain, (lang_statement_union_type *) entry, &entry->next); /* The BFD linker needs to have a list of all input BFDs involved in a link. */ ASSERT (entry->the_bfd->link_next == (bfd *) NULL); ASSERT (entry->the_bfd != output_bfd); for (pp = &link_info.input_bfds; *pp != (bfd *) NULL; pp = &(*pp)->link_next) ; *pp = entry->the_bfd; entry->the_bfd->usrdata = (PTR) entry; bfd_set_gp_size (entry->the_bfd, g_switch_value); /* Look through the sections and check for any which should not be included in the link. We need to do this now, so that we can notice when the backend linker tries to report multiple definition errors for symbols which are in sections we aren't going to link. FIXME: It might be better to entirely ignore symbols which are defined in sections which are going to be discarded. This would require modifying the backend linker for each backend which might set the SEC_LINK_ONCE flag. If we do this, we should probably handle SEC_EXCLUDE in the same way. */ bfd_map_over_sections (entry->the_bfd, section_already_linked, (PTR) entry); } void lang_add_output (name, from_script) const char *name; int from_script; { /* Make -o on command line override OUTPUT in script. */ if (had_output_filename == false || !from_script) { output_filename = name; had_output_filename = true; } } static lang_output_section_statement_type *current_section; static int topower (x) int x; { unsigned int i = 1; int l; if (x < 0) return -1; for (l = 0; l < 32; l++) { if (i >= (unsigned int) x) return l; i <<= 1; } return 0; } lang_output_section_statement_type * lang_enter_output_section_statement (output_section_statement_name, address_exp, sectype, block_value, align, subalign, ebase) const char *output_section_statement_name; etree_type *address_exp; enum section_type sectype; bfd_vma block_value; etree_type *align; etree_type *subalign; etree_type *ebase; { lang_output_section_statement_type *os; current_section = os = lang_output_section_statement_lookup (output_section_statement_name); /* Add this statement to tree. */ #if 0 add_statement (lang_output_section_statement_enum, output_section_statement); #endif /* Make next things chain into subchain of this. */ if (os->addr_tree == (etree_type *) NULL) { os->addr_tree = address_exp; } os->sectype = sectype; if (sectype != noload_section) os->flags = SEC_NO_FLAGS; else os->flags = SEC_NEVER_LOAD; os->block_value = block_value ? block_value : 1; stat_ptr = &os->children; os->subsection_alignment = topower (exp_get_value_int (subalign, -1, "subsection alignment", 0)); os->section_alignment = topower (exp_get_value_int (align, -1, "section alignment", 0)); os->load_base = ebase; return os; } void lang_final () { lang_output_statement_type *new = new_stat (lang_output_statement, stat_ptr); new->name = output_filename; } /* Reset the current counters in the regions. */ void lang_reset_memory_regions () { lang_memory_region_type *p = lang_memory_region_list; asection *o; for (p = lang_memory_region_list; p != (lang_memory_region_type *) NULL; p = p->next) { p->old_length = (bfd_size_type) (p->current - p->origin); p->current = p->origin; } for (o = output_bfd->sections; o != NULL; o = o->next) o->_raw_size = 0; } /* If the wild pattern was marked KEEP, the member sections should be as well. */ static void gc_section_callback (ptr, sec, section, file, data) lang_wild_statement_type *ptr; struct wildcard_list *sec ATTRIBUTE_UNUSED; asection *section; lang_input_statement_type *file ATTRIBUTE_UNUSED; PTR data ATTRIBUTE_UNUSED; { if (ptr->keep_sections) section->flags |= SEC_KEEP; } /* Handle a wild statement, marking it against GC. */ static void lang_gc_wild (s) lang_wild_statement_type *s; { walk_wild (s, gc_section_callback, NULL); } /* Iterate over sections marking them against GC. */ static void lang_gc_sections_1 (s) lang_statement_union_type *s; { for (; s != (lang_statement_union_type *) NULL; s = s->header.next) { switch (s->header.type) { case lang_wild_statement_enum: lang_gc_wild (&s->wild_statement); break; case lang_constructors_statement_enum: lang_gc_sections_1 (constructor_list.head); break; case lang_output_section_statement_enum: lang_gc_sections_1 (s->output_section_statement.children.head); break; case lang_group_statement_enum: lang_gc_sections_1 (s->group_statement.children.head); break; default: break; } } } static void lang_gc_sections () { struct bfd_link_hash_entry *h; ldlang_undef_chain_list_type *ulist; /* Keep all sections so marked in the link script. */ lang_gc_sections_1 (statement_list.head); /* Keep all sections containing symbols undefined on the command-line, and the section containing the entry symbol. */ for (ulist = link_info.gc_sym_list; ulist; ulist = ulist->next) { h = bfd_link_hash_lookup (link_info.hash, ulist->name, false, false, false); if (h != (struct bfd_link_hash_entry *) NULL && (h->type == bfd_link_hash_defined || h->type == bfd_link_hash_defweak) && ! bfd_is_abs_section (h->u.def.section)) { h->u.def.section->flags |= SEC_KEEP; } } bfd_gc_sections (output_bfd, &link_info); } void lang_process () { lang_reasonable_defaults (); current_target = default_target; /* Open the output file. */ lang_for_each_statement (ldlang_open_output); ldemul_create_output_section_statements (); /* Add to the hash table all undefineds on the command line. */ lang_place_undefineds (); already_linked_table_init (); /* Create a bfd for each input file. */ current_target = default_target; open_input_bfds (statement_list.head, false); link_info.gc_sym_list = &entry_symbol; if (entry_symbol.name == NULL) link_info.gc_sym_list = ldlang_undef_chain_list_head; ldemul_after_open (); already_linked_table_free (); /* Make sure that we're not mixing architectures. We call this after all the input files have been opened, but before we do any other processing, so that any operations merge_private_bfd_data does on the output file will be known during the rest of the link. */ lang_check (); /* Handle .exports instead of a version script if we're told to do so. */ if (command_line.version_exports_section) lang_do_version_exports_section (); /* Build all sets based on the information gathered from the input files. */ ldctor_build_sets (); /* Remove unreferenced sections if asked to. */ if (command_line.gc_sections) lang_gc_sections (); /* If there were any SEC_MERGE sections, finish their merging, so that section sizes can be computed. This has to be done after GC of sections, so that GCed sections are not merged, but before assigning output sections, since removing whole input sections is hard then. */ bfd_merge_sections (output_bfd, &link_info); /* Size up the common data. */ lang_common (); /* Run through the contours of the script and attach input sections to the correct output sections. */ map_input_to_output_sections (statement_list.head, (char *) NULL, (lang_output_section_statement_type *) NULL); /* Find any sections not attached explicitly and handle them. */ lang_place_orphans (); if (! link_info.relocateable) { /* Look for a text section and set the readonly attribute in it. */ asection *found = bfd_get_section_by_name (output_bfd, ".text"); if (found != (asection *) NULL) { if (config.text_read_only) found->flags |= SEC_READONLY; else found->flags &= ~SEC_READONLY; } } /* Do anything special before sizing sections. This is where ELF and other back-ends size dynamic sections. */ ldemul_before_allocation (); if (!link_info.relocateable) strip_excluded_output_sections (); /* We must record the program headers before we try to fix the section positions, since they will affect SIZEOF_HEADERS. */ lang_record_phdrs (); /* Size up the sections. */ lang_size_sections (statement_list.head, abs_output_section, &statement_list.head, 0, (bfd_vma) 0, NULL); /* Now run around and relax if we can. */ if (command_line.relax) { /* Keep relaxing until bfd_relax_section gives up. */ boolean relax_again; do { lang_reset_memory_regions (); relax_again = false; /* Note: pe-dll.c does something like this also. If you find you need to change this code, you probably need to change pe-dll.c also. DJ */ /* Do all the assignments with our current guesses as to section sizes. */ lang_do_assignments (statement_list.head, abs_output_section, (fill_type *) 0, (bfd_vma) 0); /* Perform another relax pass - this time we know where the globals are, so can make a better guess. */ lang_size_sections (statement_list.head, abs_output_section, &statement_list.head, 0, (bfd_vma) 0, &relax_again); } while (relax_again); } /* See if anything special should be done now we know how big everything is. */ ldemul_after_allocation (); /* Fix any .startof. or .sizeof. symbols. */ lang_set_startof (); /* Do all the assignments, now that we know the final resting places of all the symbols. */ lang_do_assignments (statement_list.head, abs_output_section, (fill_type *) 0, (bfd_vma) 0); /* Make sure that the section addresses make sense. */ if (! link_info.relocateable && command_line.check_section_addresses) lang_check_section_addresses (); /* Final stuffs. */ ldemul_finish (); lang_finish (); } /* EXPORTED TO YACC */ void lang_add_wild (filespec, section_list, keep_sections) struct wildcard_spec *filespec; struct wildcard_list *section_list; boolean keep_sections; { struct wildcard_list *curr, *next; lang_wild_statement_type *new; /* Reverse the list as the parser puts it back to front. */ for (curr = section_list, section_list = NULL; curr != NULL; section_list = curr, curr = next) { if (curr->spec.name != NULL && strcmp (curr->spec.name, "COMMON") == 0) placed_commons = true; next = curr->next; curr->next = section_list; } if (filespec != NULL && filespec->name != NULL) { if (strcmp (filespec->name, "*") == 0) filespec->name = NULL; else if (! wildcardp (filespec->name)) lang_has_input_file = true; } new = new_stat (lang_wild_statement, stat_ptr); new->filename = NULL; new->filenames_sorted = false; if (filespec != NULL) { new->filename = filespec->name; new->filenames_sorted = filespec->sorted; } new->section_list = section_list; new->keep_sections = keep_sections; lang_list_init (&new->children); } void lang_section_start (name, address) const char *name; etree_type *address; { lang_address_statement_type *ad; ad = new_stat (lang_address_statement, stat_ptr); ad->section_name = name; ad->address = address; } /* Set the start symbol to NAME. CMDLINE is nonzero if this is called because of a -e argument on the command line, or zero if this is called by ENTRY in a linker script. Command line arguments take precedence. */ void lang_add_entry (name, cmdline) const char *name; boolean cmdline; { if (entry_symbol.name == NULL || cmdline || ! entry_from_cmdline) { entry_symbol.name = name; entry_from_cmdline = cmdline; } } void lang_add_target (name) const char *name; { lang_target_statement_type *new = new_stat (lang_target_statement, stat_ptr); new->target = name; } void lang_add_map (name) const char *name; { while (*name) { switch (*name) { case 'F': map_option_f = true; break; } name++; } } void lang_add_fill (fill) fill_type *fill; { lang_fill_statement_type *new = new_stat (lang_fill_statement, stat_ptr); new->fill = fill; } void lang_add_data (type, exp) int type; union etree_union *exp; { lang_data_statement_type *new = new_stat (lang_data_statement, stat_ptr); new->exp = exp; new->type = type; } /* Create a new reloc statement. RELOC is the BFD relocation type to generate. HOWTO is the corresponding howto structure (we could look this up, but the caller has already done so). SECTION is the section to generate a reloc against, or NAME is the name of the symbol to generate a reloc against. Exactly one of SECTION and NAME must be NULL. ADDEND is an expression for the addend. */ void lang_add_reloc (reloc, howto, section, name, addend) bfd_reloc_code_real_type reloc; reloc_howto_type *howto; asection *section; const char *name; union etree_union *addend; { lang_reloc_statement_type *p = new_stat (lang_reloc_statement, stat_ptr); p->reloc = reloc; p->howto = howto; p->section = section; p->name = name; p->addend_exp = addend; p->addend_value = 0; p->output_section = NULL; p->output_vma = 0; } lang_assignment_statement_type * lang_add_assignment (exp) etree_type *exp; { lang_assignment_statement_type *new = new_stat (lang_assignment_statement, stat_ptr); new->exp = exp; return new; } void lang_add_attribute (attribute) enum statement_enum attribute; { new_statement (attribute, sizeof (lang_statement_union_type), stat_ptr); } void lang_startup (name) const char *name; { if (startup_file != (char *) NULL) { einfo (_("%P%Fmultiple STARTUP files\n")); } first_file->filename = name; first_file->local_sym_name = name; first_file->real = true; startup_file = name; } void lang_float (maybe) boolean maybe; { lang_float_flag = maybe; } /* Work out the load- and run-time regions from a script statement, and store them in *LMA_REGION and *REGION respectively. MEMSPEC is the name of the run-time region, or "*default*" if the statement didn't specify one. LMA_MEMSPEC is the name of the load-time region, or null if the statement didn't specify one. HAVE_LMA_P is true if the statement had an explicit load address. It is an error to specify both a load region and a load address. */ static void lang_get_regions (region, lma_region, memspec, lma_memspec, have_lma_p) struct memory_region_struct **region, **lma_region; const char *memspec, *lma_memspec; int have_lma_p; { *lma_region = lang_memory_region_lookup (lma_memspec); /* If no runtime region has been given, but the load region has been, use the load region. */ if (lma_memspec != 0 && strcmp (memspec, "*default*") == 0) *region = *lma_region; else *region = lang_memory_region_lookup (memspec); if (have_lma_p && lma_memspec != 0) einfo (_("%X%P:%S: section has both a load address and a load region\n")); } void lang_leave_output_section_statement (fill, memspec, phdrs, lma_memspec) fill_type *fill; const char *memspec; struct lang_output_section_phdr_list *phdrs; const char *lma_memspec; { lang_get_regions (¤t_section->region, ¤t_section->lma_region, memspec, lma_memspec, current_section->load_base != 0); current_section->fill = fill; current_section->phdrs = phdrs; stat_ptr = &statement_list; } /* Create an absolute symbol with the given name with the value of the address of first byte of the section named. If the symbol already exists, then do nothing. */ void lang_abs_symbol_at_beginning_of (secname, name) const char *secname; const char *name; { struct bfd_link_hash_entry *h; h = bfd_link_hash_lookup (link_info.hash, name, true, true, true); if (h == (struct bfd_link_hash_entry *) NULL) einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n")); if (h->type == bfd_link_hash_new || h->type == bfd_link_hash_undefined) { asection *sec; h->type = bfd_link_hash_defined; sec = bfd_get_section_by_name (output_bfd, secname); if (sec == (asection *) NULL) h->u.def.value = 0; else h->u.def.value = bfd_get_section_vma (output_bfd, sec); h->u.def.section = bfd_abs_section_ptr; } } /* Create an absolute symbol with the given name with the value of the address of the first byte after the end of the section named. If the symbol already exists, then do nothing. */ void lang_abs_symbol_at_end_of (secname, name) const char *secname; const char *name; { struct bfd_link_hash_entry *h; h = bfd_link_hash_lookup (link_info.hash, name, true, true, true); if (h == (struct bfd_link_hash_entry *) NULL) einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n")); if (h->type == bfd_link_hash_new || h->type == bfd_link_hash_undefined) { asection *sec; h->type = bfd_link_hash_defined; sec = bfd_get_section_by_name (output_bfd, secname); if (sec == (asection *) NULL) h->u.def.value = 0; else h->u.def.value = (bfd_get_section_vma (output_bfd, sec) + bfd_section_size (output_bfd, sec) / bfd_octets_per_byte (output_bfd)); h->u.def.section = bfd_abs_section_ptr; } } void lang_statement_append (list, element, field) lang_statement_list_type *list; lang_statement_union_type *element; lang_statement_union_type **field; { *(list->tail) = element; list->tail = field; } /* Set the output format type. -oformat overrides scripts. */ void lang_add_output_format (format, big, little, from_script) const char *format; const char *big; const char *little; int from_script; { if (output_target == NULL || !from_script) { if (command_line.endian == ENDIAN_BIG && big != NULL) format = big; else if (command_line.endian == ENDIAN_LITTLE && little != NULL) format = little; output_target = format; } } /* Enter a group. This creates a new lang_group_statement, and sets stat_ptr to build new statements within the group. */ void lang_enter_group () { lang_group_statement_type *g; g = new_stat (lang_group_statement, stat_ptr); lang_list_init (&g->children); stat_ptr = &g->children; } /* Leave a group. This just resets stat_ptr to start writing to the regular list of statements again. Note that this will not work if groups can occur inside anything else which can adjust stat_ptr, but currently they can't. */ void lang_leave_group () { stat_ptr = &statement_list; } /* Add a new program header. This is called for each entry in a PHDRS command in a linker script. */ void lang_new_phdr (name, type, filehdr, phdrs, at, flags) const char *name; etree_type *type; boolean filehdr; boolean phdrs; etree_type *at; etree_type *flags; { struct lang_phdr *n, **pp; n = (struct lang_phdr *) stat_alloc (sizeof (struct lang_phdr)); n->next = NULL; n->name = name; n->type = exp_get_value_int (type, 0, "program header type", lang_final_phase_enum); n->filehdr = filehdr; n->phdrs = phdrs; n->at = at; n->flags = flags; for (pp = &lang_phdr_list; *pp != NULL; pp = &(*pp)->next) ; *pp = n; } /* Record the program header information in the output BFD. FIXME: We should not be calling an ELF specific function here. */ static void lang_record_phdrs () { unsigned int alc; asection **secs; struct lang_output_section_phdr_list *last; struct lang_phdr *l; lang_statement_union_type *u; alc = 10; secs = (asection **) xmalloc (alc * sizeof (asection *)); last = NULL; for (l = lang_phdr_list; l != NULL; l = l->next) { unsigned int c; flagword flags; bfd_vma at; c = 0; for (u = lang_output_section_statement.head; u != NULL; u = u->output_section_statement.next) { lang_output_section_statement_type *os; struct lang_output_section_phdr_list *pl; os = &u->output_section_statement; pl = os->phdrs; if (pl != NULL) last = pl; else { if (os->sectype == noload_section || os->bfd_section == NULL || (os->bfd_section->flags & SEC_ALLOC) == 0) continue; pl = last; } if (os->bfd_section == NULL) continue; for (; pl != NULL; pl = pl->next) { if (strcmp (pl->name, l->name) == 0) { if (c >= alc) { alc *= 2; secs = ((asection **) xrealloc (secs, alc * sizeof (asection *))); } secs[c] = os->bfd_section; ++c; pl->used = true; } } } if (l->flags == NULL) flags = 0; else flags = exp_get_vma (l->flags, 0, "phdr flags", lang_final_phase_enum); if (l->at == NULL) at = 0; else at = exp_get_vma (l->at, 0, "phdr load address", lang_final_phase_enum); if (! bfd_record_phdr (output_bfd, l->type, l->flags != NULL, flags, l->at != NULL, at, l->filehdr, l->phdrs, c, secs)) einfo (_("%F%P: bfd_record_phdr failed: %E\n")); } free (secs); /* Make sure all the phdr assignments succeeded. */ for (u = lang_output_section_statement.head; u != NULL; u = u->output_section_statement.next) { struct lang_output_section_phdr_list *pl; if (u->output_section_statement.bfd_section == NULL) continue; for (pl = u->output_section_statement.phdrs; pl != NULL; pl = pl->next) if (! pl->used && strcmp (pl->name, "NONE") != 0) einfo (_("%X%P: section `%s' assigned to non-existent phdr `%s'\n"), u->output_section_statement.name, pl->name); } } /* Record a list of sections which may not be cross referenced. */ void lang_add_nocrossref (l) struct lang_nocrossref *l; { struct lang_nocrossrefs *n; n = (struct lang_nocrossrefs *) xmalloc (sizeof *n); n->next = nocrossref_list; n->list = l; nocrossref_list = n; /* Set notice_all so that we get informed about all symbols. */ link_info.notice_all = true; } /* Overlay handling. We handle overlays with some static variables. */ /* The overlay virtual address. */ static etree_type *overlay_vma; /* An expression for the maximum section size seen so far. */ static etree_type *overlay_max; /* A list of all the sections in this overlay. */ struct overlay_list { struct overlay_list *next; lang_output_section_statement_type *os; }; static struct overlay_list *overlay_list; /* Start handling an overlay. */ void lang_enter_overlay (vma_expr) etree_type *vma_expr; { /* The grammar should prevent nested overlays from occurring. */ ASSERT (overlay_vma == NULL && overlay_max == NULL); overlay_vma = vma_expr; } /* Start a section in an overlay. We handle this by calling lang_enter_output_section_statement with the correct VMA. lang_leave_overlay sets up the LMA and memory regions. */ void lang_enter_overlay_section (name) const char *name; { struct overlay_list *n; etree_type *size; lang_enter_output_section_statement (name, overlay_vma, normal_section, 0, 0, 0, 0); /* If this is the first section, then base the VMA of future sections on this one. This will work correctly even if `.' is used in the addresses. */ if (overlay_list == NULL) overlay_vma = exp_nameop (ADDR, name); /* Remember the section. */ n = (struct overlay_list *) xmalloc (sizeof *n); n->os = current_section; n->next = overlay_list; overlay_list = n; size = exp_nameop (SIZEOF, name); /* Arrange to work out the maximum section end address. */ if (overlay_max == NULL) overlay_max = size; else overlay_max = exp_binop (MAX_K, overlay_max, size); } /* Finish a section in an overlay. There isn't any special to do here. */ void lang_leave_overlay_section (fill, phdrs) fill_type *fill; struct lang_output_section_phdr_list *phdrs; { const char *name; char *clean, *s2; const char *s1; char *buf; name = current_section->name; /* For now, assume that "*default*" is the run-time memory region and that no load-time region has been specified. It doesn't really matter what we say here, since lang_leave_overlay will override it. */ lang_leave_output_section_statement (fill, "*default*", phdrs, 0); /* Define the magic symbols. */ clean = xmalloc (strlen (name) + 1); s2 = clean; for (s1 = name; *s1 != '\0'; s1++) if (ISALNUM (*s1) || *s1 == '_') *s2++ = *s1; *s2 = '\0'; buf = xmalloc (strlen (clean) + sizeof "__load_start_"); sprintf (buf, "__load_start_%s", clean); lang_add_assignment (exp_assop ('=', buf, exp_nameop (LOADADDR, name))); buf = xmalloc (strlen (clean) + sizeof "__load_stop_"); sprintf (buf, "__load_stop_%s", clean); lang_add_assignment (exp_assop ('=', buf, exp_binop ('+', exp_nameop (LOADADDR, name), exp_nameop (SIZEOF, name)))); free (clean); } /* Finish an overlay. If there are any overlay wide settings, this looks through all the sections in the overlay and sets them. */ void lang_leave_overlay (lma_expr, nocrossrefs, fill, memspec, phdrs, lma_memspec) etree_type *lma_expr; int nocrossrefs; fill_type *fill; const char *memspec; struct lang_output_section_phdr_list *phdrs; const char *lma_memspec; { lang_memory_region_type *region; lang_memory_region_type *lma_region; struct overlay_list *l; struct lang_nocrossref *nocrossref; lang_get_regions (®ion, &lma_region, memspec, lma_memspec, lma_expr != 0); nocrossref = NULL; /* After setting the size of the last section, set '.' to end of the overlay region. */ if (overlay_list != NULL) overlay_list->os->update_dot_tree = exp_assop ('=', ".", exp_binop ('+', overlay_vma, overlay_max)); l = overlay_list; while (l != NULL) { struct overlay_list *next; if (fill != (fill_type *) 0 && l->os->fill == (fill_type *) 0) l->os->fill = fill; l->os->region = region; l->os->lma_region = lma_region; /* The first section has the load address specified in the OVERLAY statement. The rest are worked out from that. The base address is not needed (and should be null) if an LMA region was specified. */ if (l->next == 0) l->os->load_base = lma_expr; else if (lma_region == 0) l->os->load_base = exp_binop ('+', exp_nameop (LOADADDR, l->next->os->name), exp_nameop (SIZEOF, l->next->os->name)); if (phdrs != NULL && l->os->phdrs == NULL) l->os->phdrs = phdrs; if (nocrossrefs) { struct lang_nocrossref *nc; nc = (struct lang_nocrossref *) xmalloc (sizeof *nc); nc->name = l->os->name; nc->next = nocrossref; nocrossref = nc; } next = l->next; free (l); l = next; } if (nocrossref != NULL) lang_add_nocrossref (nocrossref); overlay_vma = NULL; overlay_list = NULL; overlay_max = NULL; } /* Version handling. This is only useful for ELF. */ /* This global variable holds the version tree that we build. */ struct bfd_elf_version_tree *lang_elf_version_info; static int lang_vers_match_lang_c (expr, sym) struct bfd_elf_version_expr *expr; const char *sym; { if (expr->pattern[0] == '*' && expr->pattern[1] == '\0') return 1; return fnmatch (expr->pattern, sym, 0) == 0; } static int lang_vers_match_lang_cplusplus (expr, sym) struct bfd_elf_version_expr *expr; const char *sym; { char *alt_sym; int result; if (expr->pattern[0] == '*' && expr->pattern[1] == '\0') return 1; alt_sym = cplus_demangle (sym, /* DMGL_NO_TPARAMS */ 0); if (!alt_sym) { /* cplus_demangle (also) returns NULL when it is not a C++ symbol. Should we early out false in this case? */ result = fnmatch (expr->pattern, sym, 0) == 0; } else { result = fnmatch (expr->pattern, alt_sym, 0) == 0; free (alt_sym); } return result; } static int lang_vers_match_lang_java (expr, sym) struct bfd_elf_version_expr *expr; const char *sym; { char *alt_sym; int result; if (expr->pattern[0] == '*' && expr->pattern[1] == '\0') return 1; alt_sym = cplus_demangle (sym, DMGL_JAVA); if (!alt_sym) { /* cplus_demangle (also) returns NULL when it is not a Java symbol. Should we early out false in this case? */ result = fnmatch (expr->pattern, sym, 0) == 0; } else { result = fnmatch (expr->pattern, alt_sym, 0) == 0; free (alt_sym); } return result; } /* This is called for each variable name or match expression. */ struct bfd_elf_version_expr * lang_new_vers_pattern (orig, new, lang) struct bfd_elf_version_expr *orig; const char *new; const char *lang; { struct bfd_elf_version_expr *ret; ret = (struct bfd_elf_version_expr *) xmalloc (sizeof *ret); ret->next = orig; ret->pattern = new; ret->symver = 0; ret->script = 0; if (lang == NULL || strcasecmp (lang, "C") == 0) ret->match = lang_vers_match_lang_c; else if (strcasecmp (lang, "C++") == 0) ret->match = lang_vers_match_lang_cplusplus; else if (strcasecmp (lang, "Java") == 0) ret->match = lang_vers_match_lang_java; else { einfo (_("%X%P: unknown language `%s' in version information\n"), lang); ret->match = lang_vers_match_lang_c; } return ldemul_new_vers_pattern (ret); } /* This is called for each set of variable names and match expressions. */ struct bfd_elf_version_tree * lang_new_vers_node (globals, locals) struct bfd_elf_version_expr *globals; struct bfd_elf_version_expr *locals; { struct bfd_elf_version_tree *ret; ret = (struct bfd_elf_version_tree *) xmalloc (sizeof *ret); ret->next = NULL; ret->name = NULL; ret->vernum = 0; ret->globals = globals; ret->locals = locals; ret->deps = NULL; ret->name_indx = (unsigned int) -1; ret->used = 0; return ret; } /* This static variable keeps track of version indices. */ static int version_index; /* This is called when we know the name and dependencies of the version. */ void lang_register_vers_node (name, version, deps) const char *name; struct bfd_elf_version_tree *version; struct bfd_elf_version_deps *deps; { struct bfd_elf_version_tree *t, **pp; struct bfd_elf_version_expr *e1; if (name == NULL) name = ""; if ((name[0] == '\0' && lang_elf_version_info != NULL) || (lang_elf_version_info && lang_elf_version_info->name[0] == '\0')) { einfo (_("%X%P: anonymous version tag cannot be combined with other version tags\n")); return; } /* Make sure this node has a unique name. */ for (t = lang_elf_version_info; t != NULL; t = t->next) if (strcmp (t->name, name) == 0) einfo (_("%X%P: duplicate version tag `%s'\n"), name); /* Check the global and local match names, and make sure there aren't any duplicates. */ for (e1 = version->globals; e1 != NULL; e1 = e1->next) { for (t = lang_elf_version_info; t != NULL; t = t->next) { struct bfd_elf_version_expr *e2; for (e2 = t->locals; e2 != NULL; e2 = e2->next) if (strcmp (e1->pattern, e2->pattern) == 0) einfo (_("%X%P: duplicate expression `%s' in version information\n"), e1->pattern); } } for (e1 = version->locals; e1 != NULL; e1 = e1->next) { for (t = lang_elf_version_info; t != NULL; t = t->next) { struct bfd_elf_version_expr *e2; for (e2 = t->globals; e2 != NULL; e2 = e2->next) if (strcmp (e1->pattern, e2->pattern) == 0) einfo (_("%X%P: duplicate expression `%s' in version information\n"), e1->pattern); } } version->deps = deps; version->name = name; if (name[0] != '\0') { ++version_index; version->vernum = version_index; } else version->vernum = 0; for (pp = &lang_elf_version_info; *pp != NULL; pp = &(*pp)->next) ; *pp = version; } /* This is called when we see a version dependency. */ struct bfd_elf_version_deps * lang_add_vers_depend (list, name) struct bfd_elf_version_deps *list; const char *name; { struct bfd_elf_version_deps *ret; struct bfd_elf_version_tree *t; ret = (struct bfd_elf_version_deps *) xmalloc (sizeof *ret); ret->next = list; for (t = lang_elf_version_info; t != NULL; t = t->next) { if (strcmp (t->name, name) == 0) { ret->version_needed = t; return ret; } } einfo (_("%X%P: unable to find version dependency `%s'\n"), name); return ret; } static void lang_do_version_exports_section () { struct bfd_elf_version_expr *greg = NULL, *lreg; LANG_FOR_EACH_INPUT_STATEMENT (is) { asection *sec = bfd_get_section_by_name (is->the_bfd, ".exports"); char *contents, *p; bfd_size_type len; if (sec == NULL) continue; len = bfd_section_size (is->the_bfd, sec); contents = xmalloc (len); if (!bfd_get_section_contents (is->the_bfd, sec, contents, 0, len)) einfo (_("%X%P: unable to read .exports section contents\n"), sec); p = contents; while (p < contents + len) { greg = lang_new_vers_pattern (greg, p, NULL); p = strchr (p, '\0') + 1; } /* Do not free the contents, as we used them creating the regex. */ /* Do not include this section in the link. */ bfd_set_section_flags (is->the_bfd, sec, bfd_get_section_flags (is->the_bfd, sec) | SEC_EXCLUDE); } lreg = lang_new_vers_pattern (NULL, "*", NULL); lang_register_vers_node (command_line.version_exports_section, lang_new_vers_node (greg, lreg), NULL); } void lang_add_unique (name) const char *name; { struct unique_sections *ent; for (ent = unique_section_list; ent; ent = ent->next) if (strcmp (ent->name, name) == 0) return; ent = (struct unique_sections *) xmalloc (sizeof *ent); ent->name = xstrdup (name); ent->next = unique_section_list; unique_section_list = ent; }