/* Linker command language support. Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 1998 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 1, 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 "obstack.h" #include "bfdlink.h" #include "ld.h" #include "ldmain.h" #include "ldgram.h" #include "ldexp.h" #include "ldlang.h" #include "ldemul.h" #include "ldlex.h" #include "ldmisc.h" #include "ldctor.h" #include "ldfile.h" #include "fnmatch.h" #include /* 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 lang_statement_list_type lang_output_section_statement; 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 (*func) (lang_statement_union_type *), lang_statement_union_type *s)); static lang_input_statement_type *new_afile PARAMS ((const char *name, lang_input_file_enum_type file_type, const char *target, boolean add_to_list)); static void init_os PARAMS ((lang_output_section_statement_type *s)); static void exp_init_os PARAMS ((etree_type *)); static void section_already_linked PARAMS ((bfd *, asection *, PTR)); static boolean wildcardp PARAMS ((const char *)); static void wild_section PARAMS ((lang_wild_statement_type *ptr, const char *section, lang_input_statement_type *file, lang_output_section_statement_type *output)); static lang_input_statement_type *lookup_name PARAMS ((const char *name)); static void load_symbols PARAMS ((lang_input_statement_type *entry, lang_statement_list_type *)); static void wild_file PARAMS ((lang_wild_statement_type *, const char *, lang_input_statement_type *, lang_output_section_statement_type *)); static void wild PARAMS ((lang_wild_statement_type *s, const char *section, const char *file, const char *target, lang_output_section_statement_type *output)); static bfd *open_output PARAMS ((const char *name)); static void ldlang_open_output PARAMS ((lang_statement_union_type *statement)); static void open_input_bfds PARAMS ((lang_statement_union_type *statement, boolean)); static void lang_reasonable_defaults PARAMS ((void)); static void lang_place_undefineds PARAMS ((void)); static void map_input_to_output_sections PARAMS ((lang_statement_union_type *s, const char *target, lang_output_section_statement_type *output_section_statement)); static void print_output_section_statement PARAMS ((lang_output_section_statement_type *output_section_statement)); static void print_assignment PARAMS ((lang_assignment_statement_type *assignment, lang_output_section_statement_type *output_section)); static void print_input_statement PARAMS ((lang_input_statement_type *statm)); static boolean print_one_symbol PARAMS ((struct bfd_link_hash_entry *, PTR)); static void print_input_section PARAMS ((lang_input_section_type *in)); static void print_fill_statement PARAMS ((lang_fill_statement_type *fill)); static void print_data_statement PARAMS ((lang_data_statement_type *data)); static void print_address_statement PARAMS ((lang_address_statement_type *)); static void print_reloc_statement PARAMS ((lang_reloc_statement_type *reloc)); static void print_padding_statement PARAMS ((lang_padding_statement_type *s)); static void print_wild_statement PARAMS ((lang_wild_statement_type *w, lang_output_section_statement_type *os)); static void print_group PARAMS ((lang_group_statement_type *, lang_output_section_statement_type *)); static void print_statement PARAMS ((lang_statement_union_type *s, lang_output_section_statement_type *os)); static void print_statement_list PARAMS ((lang_statement_union_type *s, lang_output_section_statement_type *os)); static void print_statements PARAMS ((void)); static bfd_vma insert_pad PARAMS ((lang_statement_union_type **this_ptr, fill_type fill, unsigned int power, asection *output_section_statement, bfd_vma dot)); static bfd_vma size_input_section PARAMS ((lang_statement_union_type **this_ptr, lang_output_section_statement_type *output_section_statement, fill_type fill, bfd_vma dot, boolean relax)); 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 reset_memory_regions PARAMS ((void)); static void lang_record_phdrs PARAMS ((void)); /* EXPORTS */ lang_output_section_statement_type *abs_output_section; lang_statement_list_type *stat_ptr = &statement_list; lang_statement_list_type file_chain = { 0 }; const char *entry_symbol = NULL; 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; 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 #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); } /*---------------------------------------------------------------------- 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->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 havn'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; 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 = buystring (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; } } 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->fill = 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->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", 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 sections, and arranges to discard it if a section of the same name has already been linked. 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. This is called via bfd_map_over_sections. */ /*ARGSUSED*/ static void section_already_linked (abfd, sec, data) bfd *abfd; asection *sec; PTR data; { lang_input_statement_type *entry = (lang_input_statement_type *) data; struct sec_link_once { struct sec_link_once *next; asection *sec; }; static struct sec_link_once *sec_link_once_list; flagword flags; const char *name; struct sec_link_once *l; /* If we are only reading symbols from this object, then we want to discard all sections. */ if (entry->just_syms_flag) { sec->output_section = bfd_abs_section_ptr; sec->output_offset = sec->vma; return; } flags = bfd_get_section_flags (abfd, sec); if ((flags & SEC_LINK_ONCE) == 0) return; name = bfd_get_section_name (abfd, sec); for (l = sec_link_once_list; l != NULL; l = l->next) { if (strcmp (name, bfd_get_section_name (l->sec->owner, l->sec)) == 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: einfo ("%P: %B: warning: ignoring duplicate section `%s'\n", abfd, 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 wild_doit does not create a lang_input_section structure for this section. */ sec->output_section = bfd_abs_section_ptr; return; } } /* This is the first section with this name. Record it. */ l = (struct sec_link_once *) xmalloc (sizeof *l); l->sec = sec; l->next = sec_link_once_list; sec_link_once_list = l; } /* 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 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 wild_doit (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 = true; } else first = false; /* 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; section->output_section->flags |= flags; /* 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; } 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; } } /* Expand a wild statement for a particular FILE. SECTION may be NULL, in which case it is a wild card. */ static void wild_section (ptr, section, file, output) lang_wild_statement_type *ptr; const char *section; lang_input_statement_type *file; lang_output_section_statement_type *output; { if (file->just_syms_flag == false) { register asection *s; boolean wildcard; if (section == NULL) wildcard = false; else wildcard = wildcardp (section); for (s = file->the_bfd->sections; s != NULL; s = s->next) { boolean match; /* Attach all sections named SECTION. If SECTION is NULL, then attach all sections. Previously, if SECTION was NULL, this code did not call wild_doit if the SEC_IS_COMMON flag was set for the section. I did not understand that, and I took it out. --ian@cygnus.com. */ if (section == NULL) match = true; else { const char *name; name = bfd_get_section_name (file->the_bfd, s); if (wildcard) match = fnmatch (section, name, 0) == 0 ? true : false; else match = strcmp (section, name) == 0 ? true : false; } if (match) wild_doit (&ptr->children, s, output, file); } } } /* 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; load_symbols (search, (lang_statement_list_type *) NULL); return search; } /* Get the symbols for an input file. */ static void load_symbols (entry, place) lang_input_statement_type *entry; lang_statement_list_type *place; { char **matching; if (entry->loaded) return; 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; err = bfd_get_error (); 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); bfd_close (entry->the_bfd); entry->the_bfd = NULL; /* See if the emulation has some special knowledge. */ if (ldemul_unrecognized_file (entry)) return; /* 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; } /* 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 = bfd_openr_next_archived_file (entry->the_bfd, (bfd *) NULL); while (member != NULL) { if (! bfd_check_format (member, bfd_object)) einfo ("%F%B: object %B in archive is not object\n", entry->the_bfd, member); 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); member = bfd_openr_next_archived_file (entry->the_bfd, member); } entry->loaded = true; return; } } if (! bfd_link_add_symbols (entry->the_bfd, &link_info)) einfo ("%F%B: could not read symbols: %E\n", entry->the_bfd); entry->loaded = true; } /* Handle a wild statement for a single file F. */ static void wild_file (s, section, f, output) lang_wild_statement_type *s; const char *section; lang_input_statement_type *f; lang_output_section_statement_type *output; { if (f->the_bfd == NULL || ! bfd_check_format (f->the_bfd, bfd_archive)) wild_section (s, section, f, output); 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) { wild_section (s, section, (lang_input_statement_type *) member->usrdata, output); } member = bfd_openr_next_archived_file (f->the_bfd, member); } } } /* Handle a wild statement. SECTION or FILE 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, section, file, target, output) lang_wild_statement_type *s; const char *section; const char *file; const char *target; lang_output_section_statement_type *output; { lang_input_statement_type *f; if (file == (char *) NULL) { /* Perform the iteration over all files in the list */ for (f = (lang_input_statement_type *) file_chain.head; f != (lang_input_statement_type *) NULL; f = (lang_input_statement_type *) f->next) { wild_file (s, section, f, output); } } else if (wildcardp (file)) { for (f = (lang_input_statement_type *) file_chain.head; f != (lang_input_statement_type *) NULL; f = (lang_input_statement_type *) f->next) { if (fnmatch (file, f->filename, FNM_FILE_NAME) == 0) wild_file (s, section, f, output); } } else { /* Perform the iteration over a single file */ f = lookup_name (file); wild_file (s, section, f, output); } if (section != (char *) NULL && strcmp (section, "COMMON") == 0 && default_common_section == NULL) { /* 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; } } /* Open the output file. */ static bfd * open_output (name) const char *name; { bfd *output; if (output_target == (char *) NULL) { if (current_target != (char *) NULL) output_target = current_target; else output_target = default_target; } 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; /* output->flags |= D_PAGED;*/ 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->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 == true) { 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. */ if (force && s->input_statement.loaded && bfd_check_format (s->input_statement.the_bfd, bfd_archive)) s->input_statement.loaded = false; lang_list_init (&add); load_symbols (&s->input_statement, &add); if (add.head != NULL) { *add.tail = s->next; s->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. Remove items from the chain as we open input bfds */ typedef struct ldlang_undef_chain_list { struct ldlang_undef_chain_list *next; char *name; } ldlang_undef_chain_list_type; static ldlang_undef_chain_list_type *ldlang_undef_chain_list_head; 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 = buystring (name); } /* 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) { struct bfd_link_hash_entry *h; h = bfd_link_hash_lookup (link_info.hash, ptr->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); } } } /* 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->next) { switch (s->header.type) { case lang_wild_statement_enum: wild (&s->wild_statement, s->wild_statement.section_name, s->wild_statement.filename, 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; } } } 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) minfo ("0x%V", result.value + result.section->bfd_section->vma); 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; 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, 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; } } } static void print_fill_statement (fill) lang_fill_statement_type * fill; { fprintf (config.map_file, " FILL mask 0x%x\n", fill->fill); } static void print_data_statement (data) lang_data_statement_type * data; { int i; bfd_vma addr; bfd_size_type size; const char *name; 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; } /* 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; 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; } static void print_padding_statement (s) lang_padding_statement_type *s; { int len; bfd_vma addr; 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 != 0) minfo (" %u", s->fill); print_nl (); print_dot = addr + s->size; } static void print_wild_statement (w, os) lang_wild_statement_type * w; lang_output_section_statement_type * os; { print_space (); if (w->filename != NULL) minfo ("%s", w->filename); else minfo ("*"); if (w->section_name != NULL) minfo ("(%s)", w->section_name); else 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->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) { 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->next; } } config.map_file = map_save; } static bfd_vma insert_pad (this_ptr, fill, power, output_section_statement, dot) lang_statement_union_type ** this_ptr; fill_type fill; unsigned int power; asection * output_section_statement; bfd_vma dot; { /* Align this section first to the input sections requirement, then to the output section's requirement. If this alignment is > than any seen before, then record it too. Perform the alignment by inserting a magic 'padding' statement. */ unsigned int alignment_needed = align_power (dot, power) - dot; if (alignment_needed != 0) { lang_statement_union_type *new = ((lang_statement_union_type *) stat_alloc (sizeof (lang_padding_statement_type))); /* Link into existing chain */ new->header.next = *this_ptr; *this_ptr = new; new->header.type = lang_padding_statement_enum; new->padding_statement.output_section = output_section_statement; new->padding_statement.output_offset = dot - output_section_statement->vma; new->padding_statement.fill = fill; new->padding_statement.size = alignment_needed; } /* Remember the most restrictive alignment */ if (power > output_section_statement->alignment_power) { output_section_statement->alignment_power = power; } output_section_statement->_raw_size += alignment_needed; return alignment_needed + dot; } /* Work out how much this section will move the dot point */ static bfd_vma size_input_section (this_ptr, output_section_statement, fill, dot, relax) lang_statement_union_type ** this_ptr; lang_output_section_statement_type * output_section_statement; fill_type fill; bfd_vma dot; boolean relax; { lang_input_section_type *is = &((*this_ptr)->input_section); asection *i = is->section; if (is->ifile->just_syms_flag == false) { if (output_section_statement->subsection_alignment != -1) i->alignment_power = output_section_statement->subsection_alignment; dot = insert_pad (this_ptr, fill, i->alignment_power, output_section_statement->bfd_section, dot); /* Remember where in the output section this input section goes */ i->output_offset = dot - output_section_statement->bfd_section->vma; /* Mark how big the output section must be to contain this now */ if (i->_cooked_size != 0) dot += i->_cooked_size; else dot += i->_raw_size; output_section_statement->bfd_section->_raw_size = dot - output_section_statement->bfd_section->vma; } else { i->output_offset = i->vma - output_section_statement->bfd_section->vma; } return dot; } /* This variable indicates whether bfd_relax_section should be called again. */ static boolean relax_again; /* Set the sizes for all the output sections. */ 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; { /* Size up the sections from their constituent parts */ for (; s != (lang_statement_union_type *) NULL; s = s->next) { switch (s->header.type) { case lang_output_section_statement_enum: { bfd_vma after; lang_output_section_statement_type *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->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 && ! 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 == 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; } (void) lang_size_sections (os->children.head, os, &os->children.head, os->fill, dot, relax); /* Ignore the size of the input sections, use the vma and size to */ /* align against */ after = ALIGN_N (os->bfd_section->vma + os->bfd_section->_raw_size, /* The coercion here is important, see ld.h. */ (bfd_vma) os->block_value); if (bfd_is_abs_section (os->bfd_section)) ASSERT (after == os->bfd_section->vma); else os->bfd_section->_raw_size = after - os->bfd_section->vma; dot = os->bfd_section->vma + os->bfd_section->_raw_size; os->processed = true; /* Replace into region ? */ if (os->region != (lang_memory_region_type *) NULL) { os->region->current = dot; /* Make sure this isn't silly. */ if (os->region->current < os->region->origin || (os->region->current - os->region->origin > os->region->length)) { if (os->addr_tree != (etree_type *) NULL) { einfo ("%X%P: address 0x%v of %B section %s is not within region %s\n", os->region->current, os->bfd_section->owner, os->bfd_section->name, os->region->name); } else { einfo ("%X%P: region %s is full (%B section %s)\n", os->region->name, os->bfd_section->owner, os->bfd_section->name); } /* Reset the region pointer. */ os->region->current = os->region->origin; } } } break; case lang_constructors_statement_enum: dot = lang_size_sections (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) { 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; } dot += size; 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; output_section_statement->bfd_section->_raw_size += size; } break; case lang_wild_statement_enum: dot = lang_size_sections (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_again = true; } dot = size_input_section (prev, output_section_statement, output_section_statement->fill, dot, relax); } 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 && !relax) { /* The assignment changed dot. Insert a pad. */ 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 { lang_statement_union_type *new = ((lang_statement_union_type *) stat_alloc (sizeof (lang_padding_statement_type))); /* Link into existing chain */ new->header.next = *prev; *prev = new; new->header.type = lang_padding_statement_enum; new->padding_statement.output_section = output_section_statement->bfd_section; new->padding_statement.output_offset = dot - output_section_statement->bfd_section->vma; new->padding_statement.fill = fill; new->padding_statement.size = newdot - dot; output_section_statement->bfd_section->_raw_size += new->padding_statement.size; } dot = newdot; } } break; case lang_padding_statement_enum: /* If we are relaxing, and this is not the first pass, some padding statements may have been inserted during previous passes. We may have to move the padding statement to a new location if dot has a different value at this point in this pass than it did at this point in the previous pass. */ s->padding_statement.output_offset = dot - output_section_statement->bfd_section->vma; dot += s->padding_statement.size; output_section_statement->bfd_section->_raw_size += s->padding_statement.size; break; case lang_group_statement_enum: dot = lang_size_sections (s->group_statement.children.head, output_section_statement, &s->group_statement.children.head, fill, dot, relax); break; default: FAIL (); break; /* This can only get here when relaxing is turned on */ case lang_address_statement_enum: break; } prev = &s->header.next; } return dot; } 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; { for (; s != (lang_statement_union_type *) NULL; s = s->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 = &(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; } 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 == false) einfo ("%F%P: invalid data statement\n"); } switch (s->data_statement.type) { case QUAD: case SQUAD: dot += QUAD_SIZE; break; case LONG: dot += LONG_SIZE; break; case SHORT: dot += SHORT_SIZE; break; case BYTE: dot += BYTE_SIZE; break; } 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 == false) einfo ("%F%P: invalid reloc statement\n"); } dot += bfd_get_reloc_size (s->reloc_statement.howto); break; case lang_input_section_enum: { asection *in = s->input_section.section; if (in->_cooked_size != 0) dot += in->_cooked_size; else dot += in->_raw_size; } 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; 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) { h->type = bfd_link_hash_defined; if (s->_cooked_size != 0) h->u.def.value = s->_cooked_size; else h->u.def.value = s->_raw_size; 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 == (char *) NULL) { /* No entry has been specified. Look for start, but don't warn if we don't find it. */ entry_symbol = "start"; warn = false; } h = bfd_link_hash_lookup (link_info.hash, entry_symbol, 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); } else { asection *ts; /* Can't find the entry symbol. Use the first address in the text section. */ ts = bfd_get_section_by_name (output_bfd, ".text"); if (ts != (asection *) NULL) { if (warn) einfo ("%P: warning: cannot find entry symbol %s; defaulting to %V\n", entry_symbol, 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); } } } /* 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, ...) #else ignore_bfd_errors (s) const char *s; #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); 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 { 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 (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; 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, (bfd_size_type) (1 << power_of_two)); /* 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_input_statement_type *file; for (file = (lang_input_statement_type *) file_chain.head; file != (lang_input_statement_type *) NULL; file = (lang_input_statement_type *) file->next) { 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) { /* We are only retrieving symbol values from this file. We want the symbols to act as though the values in the file are absolute. */ s->output_section = bfd_abs_section_ptr; s->output_offset = s->vma; } 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"); } wild_doit (&default_common_section->children, s, default_common_section, file); } } else if (ldemul_place_orphan (file, s)) ; else { lang_output_section_statement_type *os = lang_output_section_statement_lookup (s->name); wild_doit (&os->children, s, os, file); } } } } } void lang_set_flags (ptr, flags) lang_memory_region_type *ptr; CONST char *flags; { flagword *ptr_flags = &ptr->flags; ptr->flags = ptr->not_flags = 0; while (*flags) { switch (*flags) { case '!': ptr_flags = (ptr_flags == &ptr->flags) ? &ptr->not_flags : &ptr->flags; break; 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_input_statement_type *f; for (f = (lang_input_statement_type *) file_chain.head; f != (lang_input_statement_type *) NULL; f = (lang_input_statement_type *) f->next) { func (f); } } #if 0 /* Not used. */ void lang_for_each_input_section (func) void (*func) PARAMS ((bfd * ab, asection * as)); { lang_input_statement_type *f; for (f = (lang_input_statement_type *) file_chain.head; f != (lang_input_statement_type *) NULL; f = (lang_input_statement_type *) f->next) { 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; } void 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 */ /* add_statement(lang_output_section_statement_enum, output_section_statement);*/ /* 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; } 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 */ static void reset_memory_regions () { lang_memory_region_type *p = lang_memory_region_list; 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; } } void lang_process () { lang_reasonable_defaults (); current_target = default_target; lang_for_each_statement (ldlang_open_output); /* Open the output file */ ldemul_create_output_section_statements (); /* Add to the hash table all undefineds on the command line */ lang_place_undefineds (); /* Create a bfd for each input file */ current_target = default_target; open_input_bfds (statement_list.head, false); ldemul_after_open (); /* 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 (); /* Build all sets based on the information gathered from the input files. */ ldctor_build_sets (); /* 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 (); ldemul_before_allocation (); /* We must record the program headers before we try to fix the section positions, since they will affect SIZEOF_HEADERS. */ lang_record_phdrs (); /* Now run around and relax if we can */ if (command_line.relax) { /* First time round is a trial run to get the 'worst case' addresses of the objects if there was no relaxing. */ lang_size_sections (statement_list.head, abs_output_section, &(statement_list.head), 0, (bfd_vma) 0, false); /* Keep relaxing until bfd_relax_section gives up. */ do { reset_memory_regions (); relax_again = false; /* 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 better guess. */ lang_size_sections (statement_list.head, abs_output_section, &(statement_list.head), 0, (bfd_vma) 0, true); } while (relax_again); } else { /* Size up the sections. */ lang_size_sections (statement_list.head, abs_output_section, &(statement_list.head), 0, (bfd_vma) 0, false); } /* 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 restingplaces of all the symbols */ lang_do_assignments (statement_list.head, abs_output_section, (fill_type) 0, (bfd_vma) 0); /* Final stuffs */ ldemul_finish (); lang_finish (); } /* EXPORTED TO YACC */ void lang_add_wild (section_name, filename) CONST char *CONST section_name; CONST char *CONST filename; { lang_wild_statement_type *new = new_stat (lang_wild_statement, stat_ptr); if (section_name != (char *) NULL && strcmp (section_name, "COMMON") == 0) { placed_commons = true; } if (filename != (char *) NULL) { lang_has_input_file = true; } new->section_name = section_name; new->filename = filename; lang_list_init (&new->children); } void lang_section_start (name, address) CONST char *name; etree_type * address; { lang_address_statement_type *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. */ /* WINDOWS_NT. When an entry point has been specified, we will also force this symbol to be defined by calling ldlang_add_undef (equivalent to having switch -u entry_name on the command line). The reason we do this is so that the user doesn't have to because they would have to use the -u switch if they were specifying an entry point other than _mainCRTStartup. Specifically, if creating a windows application, entry point _WinMainCRTStartup must be specified. What I have found for non console applications (entry not _mainCRTStartup) is that the .obj that contains mainCRTStartup is brought in since it is the first encountered in libc.lib and it has other symbols in it which will be pulled in by the link process. To avoid this, adding -u with the entry point name specified forces the correct .obj to be used. We can avoid making the user do this by always adding the entry point name as an undefined symbol. */ void lang_add_entry (name, cmdline) CONST char *name; boolean cmdline; { if (entry_symbol == NULL || cmdline || ! entry_from_cmdline) { entry_symbol = name; entry_from_cmdline = cmdline; } #if 0 /* don't do this yet. It seems to work (the executables run), but the image created is very different from what I was getting before indicating that something else is being pulled in. When everything else is working, then try to put this back in to see if it will do the right thing for other more complicated applications */ ldlang_add_undef (name); #endif } 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 (exp) int exp; { lang_fill_statement_type *new = new_stat (lang_fill_statement, stat_ptr); new->fill = exp; } 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; } void lang_add_assignment (exp) etree_type * exp; { lang_assignment_statement_type *new = new_stat (lang_assignment_statement, stat_ptr); new->exp = exp; } 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; } void lang_leave_output_section_statement (fill, memspec, phdrs) bfd_vma fill; const char *memspec; struct lang_output_section_phdr_list *phdrs; { current_section->fill = fill; current_section->region = lang_memory_region_lookup (memspec); 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)); 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 ? false : true, flags, l->at == NULL ? false : true, 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; /* The overlay load address. */ static etree_type *overlay_lma; /* Whether nocrossrefs is set for this overlay. */ static int overlay_nocrossrefs; /* 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, lma_expr, nocrossrefs) etree_type *vma_expr; etree_type *lma_expr; int nocrossrefs; { /* The grammar should prevent nested overlays from occurring. */ ASSERT (overlay_vma == NULL && overlay_lma == NULL && overlay_list == NULL && overlay_max == NULL); overlay_vma = vma_expr; overlay_lma = lma_expr; overlay_nocrossrefs = nocrossrefs; } /* Start a section in an overlay. We handle this by calling lang_enter_output_section_statement with the correct VMA and LMA. */ 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, overlay_lma); /* If this is the first section, then base the VMA and LMA 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); overlay_lma = exp_nameop (LOADADDR, 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); /* Adjust the LMA for the next section. */ overlay_lma = exp_binop ('+', overlay_lma, size); /* Arrange to work out the maximum section end address. */ if (overlay_max == NULL) overlay_max = size; else overlay_max = exp_binop (MAX, overlay_max, size); } /* Finish a section in an overlay. There isn't any special to do here. */ void lang_leave_overlay_section (fill, phdrs) bfd_vma fill; struct lang_output_section_phdr_list *phdrs; { const char *name; char *clean, *s2; const char *s1; char *buf; name = current_section->name; lang_leave_output_section_statement (fill, "*default*", phdrs); /* Define the magic symbols. */ clean = xmalloc (strlen (name) + 1); s2 = clean; for (s1 = name; *s1 != '\0'; s1++) if (isalnum ((unsigned char) *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 (fill, memspec, phdrs) bfd_vma fill; const char *memspec; struct lang_output_section_phdr_list *phdrs; { lang_memory_region_type *region; struct overlay_list *l; struct lang_nocrossref *nocrossref; if (memspec == NULL) region = NULL; else region = lang_memory_region_lookup (memspec); nocrossref = NULL; l = overlay_list; while (l != NULL) { struct overlay_list *next; if (fill != 0 && l->os->fill == 0) l->os->fill = fill; if (region != NULL && l->os->region == NULL) l->os->region = region; if (phdrs != NULL && l->os->phdrs == NULL) l->os->phdrs = phdrs; if (overlay_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); /* Update . for the end of the overlay. */ lang_add_assignment (exp_assop ('=', ".", exp_binop ('+', overlay_vma, overlay_max))); overlay_vma = NULL; overlay_lma = NULL; overlay_nocrossrefs = 0; 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; /* This is called for each variable name or match expression. */ struct bfd_elf_version_expr * lang_new_vers_regex (orig, new) struct bfd_elf_version_expr *orig; const char *new; { struct bfd_elf_version_expr *ret; ret = (struct bfd_elf_version_expr *) xmalloc (sizeof *ret); ret->next = orig; ret->match = new; return 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; /* 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->match, e2->match) == 0) einfo ("%X%P: duplicate expression `%s' in version information\n", e1->match); } } 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->match, e2->match) == 0) einfo ("%X%P: duplicate expression `%s' in version information\n", e1->match); } } version->deps = deps; version->name = name; ++version_index; version->vernum = version_index; 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; }