blob: 924e3ec32c5ea24a1e75eccf7234dc0cc4206014 [file] [log] [blame]
/* Linker command language support.
Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
2001
Free Software Foundation, Inc.
This file is part of GLD, the Gnu Linker.
GLD is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GLD is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GLD; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#include "bfd.h"
#include "sysdep.h"
#include "libiberty.h"
#include "obstack.h"
#include "bfdlink.h"
#include "ld.h"
#include "ldmain.h"
#include "ldgram.h"
#include "ldexp.h"
#include "ldlang.h"
#include "ldlex.h"
#include "ldmisc.h"
#include "ldctor.h"
#include "ldfile.h"
#include "ldemul.h"
#include "fnmatch.h"
#include "demangle.h"
#include <ctype.h>
/* FORWARDS */
static lang_statement_union_type *new_statement
PARAMS ((enum statement_enum, size_t, lang_statement_list_type *));
/* LOCALS */
static struct obstack stat_obstack;
#define obstack_chunk_alloc xmalloc
#define obstack_chunk_free free
static const char *startup_file;
static lang_statement_list_type input_file_chain;
static boolean placed_commons = false;
static lang_output_section_statement_type *default_common_section;
static boolean map_option_f;
static bfd_vma print_dot;
static lang_input_statement_type *first_file;
static const char *current_target;
static const char *output_target;
static lang_statement_list_type statement_list;
static struct lang_phdr *lang_phdr_list;
static void lang_for_each_statement_worker
PARAMS ((void (*) (lang_statement_union_type *),
lang_statement_union_type *));
static lang_input_statement_type *new_afile
PARAMS ((const char *, lang_input_file_enum_type, const char *, boolean));
static lang_memory_region_type *lang_memory_default PARAMS ((asection *));
static void lang_map_flags PARAMS ((flagword));
static void init_os PARAMS ((lang_output_section_statement_type *));
static void exp_init_os PARAMS ((etree_type *));
static void section_already_linked PARAMS ((bfd *, asection *, PTR));
static struct bfd_hash_entry *already_linked_newfunc
PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
static void already_linked_table_init PARAMS ((void));
static void already_linked_table_free PARAMS ((void));
static boolean wildcardp PARAMS ((const char *));
static lang_statement_union_type *wild_sort
PARAMS ((lang_wild_statement_type *, lang_input_statement_type *,
asection *));
static void output_section_callback
PARAMS ((lang_wild_statement_type *, asection *,
lang_input_statement_type *, PTR));
static lang_input_statement_type *lookup_name PARAMS ((const char *));
static void load_symbols
PARAMS ((lang_input_statement_type *, lang_statement_list_type *));
static void wild
PARAMS ((lang_wild_statement_type *, const char *, const char *,
const char *, lang_output_section_statement_type *));
static bfd *open_output PARAMS ((const char *));
static void ldlang_open_output PARAMS ((lang_statement_union_type *));
static void open_input_bfds PARAMS ((lang_statement_union_type *, boolean));
static void lang_reasonable_defaults PARAMS ((void));
static void lang_place_undefineds PARAMS ((void));
static void map_input_to_output_sections
PARAMS ((lang_statement_union_type *, const char *,
lang_output_section_statement_type *));
static void print_output_section_statement
PARAMS ((lang_output_section_statement_type *));
static void print_assignment
PARAMS ((lang_assignment_statement_type *,
lang_output_section_statement_type *));
static void print_input_statement PARAMS ((lang_input_statement_type *));
static boolean print_one_symbol PARAMS ((struct bfd_link_hash_entry *, PTR));
static void print_input_section PARAMS ((lang_input_section_type *));
static void print_fill_statement PARAMS ((lang_fill_statement_type *));
static void print_data_statement PARAMS ((lang_data_statement_type *));
static void print_address_statement PARAMS ((lang_address_statement_type *));
static void print_reloc_statement PARAMS ((lang_reloc_statement_type *));
static void print_padding_statement PARAMS ((lang_padding_statement_type *));
static void print_wild_statement
PARAMS ((lang_wild_statement_type *, lang_output_section_statement_type *));
static void print_group
PARAMS ((lang_group_statement_type *, lang_output_section_statement_type *));
static void print_statement
PARAMS ((lang_statement_union_type *, lang_output_section_statement_type *));
static void print_statement_list
PARAMS ((lang_statement_union_type *, lang_output_section_statement_type *));
static void print_statements PARAMS ((void));
static bfd_vma insert_pad
PARAMS ((lang_statement_union_type **, fill_type,
unsigned int, asection *, bfd_vma));
static bfd_vma size_input_section
PARAMS ((lang_statement_union_type **, lang_output_section_statement_type *,
fill_type, bfd_vma, boolean));
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 gc_section_callback
PARAMS ((lang_wild_statement_type *, asection *,
lang_input_statement_type *, PTR));
static void lang_record_phdrs PARAMS ((void));
static void lang_gc_wild
PARAMS ((lang_wild_statement_type *, const char *, const char *));
static void lang_gc_sections_1 PARAMS ((lang_statement_union_type *));
static void lang_gc_sections PARAMS ((void));
static int lang_vers_match_lang_c
PARAMS ((struct bfd_elf_version_expr *, const char *));
static int lang_vers_match_lang_cplusplus
PARAMS ((struct bfd_elf_version_expr *, const char *));
static int lang_vers_match_lang_java
PARAMS ((struct bfd_elf_version_expr *, const char *));
static void lang_do_version_exports_section PARAMS ((void));
static void lang_check_section_addresses PARAMS ((void));
static void os_region_check
PARAMS ((lang_output_section_statement_type *,
struct memory_region_struct *, etree_type *, bfd_vma));
typedef void (*callback_t) PARAMS ((lang_wild_statement_type *,
asection *, lang_input_statement_type *,
PTR));
static void walk_wild
PARAMS ((lang_wild_statement_type *, const char *, const char *,
callback_t, PTR));
static void walk_wild_section
PARAMS ((lang_wild_statement_type *, const char *,
lang_input_statement_type *, callback_t, PTR));
static void walk_wild_file
PARAMS ((lang_wild_statement_type *, const char *,
lang_input_statement_type *, callback_t, PTR));
static int get_target PARAMS ((const bfd_target *, PTR));
static void stricpy PARAMS ((char *, char *));
static void strcut PARAMS ((char *, char *));
static int name_compare PARAMS ((char *, char *));
static int closest_target_match PARAMS ((const bfd_target *, PTR));
static char * get_first_input_target PARAMS ((void));
/* EXPORTS */
lang_output_section_statement_type *abs_output_section;
lang_statement_list_type lang_output_section_statement;
lang_statement_list_type *stat_ptr = &statement_list;
lang_statement_list_type file_chain = { NULL, NULL };
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;
struct unique_sections *unique_section_list;
etree_type *base; /* Relocation base - or null */
#if defined (__STDC__) || defined (ALMOST_STDC)
#define cat(a,b) a##b
#else
#define cat(a,b) a/**/b
#endif
/* Don't beautify the line below with "innocent" whitespace, it breaks
the K&R C preprocessor! */
#define new_stat(x, y) \
(cat (x,_type)*) new_statement (cat (x,_enum), sizeof (cat (x,_type)), y)
#define outside_section_address(q) \
((q)->output_offset + (q)->output_section->vma)
#define outside_symbol_address(q) \
((q)->value + outside_section_address (q->section))
#define SECTION_NAME_MAP_LENGTH (16)
PTR
stat_alloc (size)
size_t size;
{
return obstack_alloc (&stat_obstack, size);
}
boolean
unique_section_p (secnam)
const char *secnam;
{
struct unique_sections *unam;
for (unam = unique_section_list; unam; unam = unam->next)
if (wildcardp (unam->name)
? fnmatch (unam->name, secnam, 0) == 0
: strcmp (unam->name, secnam) == 0)
{
return true;
}
return false;
}
/* Generic traversal routines for finding matching sections. */
static void
walk_wild_section (ptr, section, file, callback, data)
lang_wild_statement_type *ptr;
const char *section;
lang_input_statement_type *file;
callback_t callback;
PTR data;
{
/* Don't process sections from files which were excluded. */
if (ptr->exclude_filename_list != NULL)
{
struct name_list *list_tmp;
for (list_tmp = ptr->exclude_filename_list;
list_tmp;
list_tmp = list_tmp->next)
{
boolean match;
if (wildcardp (list_tmp->name))
match = fnmatch (list_tmp->name, file->filename, 0) == 0;
else
match = strcmp (list_tmp->name, file->filename) == 0;
if (match)
return;
}
}
if (file->just_syms_flag == false)
{
register asection *s;
boolean wildcard = false;
if (section != NULL)
wildcard = wildcardp (section);
for (s = file->the_bfd->sections; s != NULL; s = s->next)
{
boolean match;
const char *sname = bfd_get_section_name (file->the_bfd, s);
if (section == NULL)
match = true;
else if (wildcard)
match = fnmatch (section, sname, 0) == 0;
else
match = strcmp (section, sname) == 0;
/* If this is a wild-card output section statement, exclude
sections that match UNIQUE_SECTION_LIST. */
if (match && (data == NULL || !unique_section_p (sname)))
(*callback) (ptr, s, file, data);
}
}
}
/* Handle a wild statement for a single file F. */
static void
walk_wild_file (s, section, f, callback, data)
lang_wild_statement_type *s;
const char *section;
lang_input_statement_type *f;
callback_t callback;
PTR data;
{
if (f->the_bfd == NULL
|| ! bfd_check_format (f->the_bfd, bfd_archive))
walk_wild_section (s, section, f, callback, data);
else
{
bfd *member;
/* This is an archive file. We must map each member of the
archive separately. */
member = bfd_openr_next_archived_file (f->the_bfd, (bfd *) NULL);
while (member != NULL)
{
/* When lookup_name is called, it will call the add_symbols
entry point for the archive. For each element of the
archive which is included, BFD will call ldlang_add_file,
which will set the usrdata field of the member to the
lang_input_statement. */
if (member->usrdata != NULL)
{
walk_wild_section (s, section,
(lang_input_statement_type *) member->usrdata,
callback, data);
}
member = bfd_openr_next_archived_file (f->the_bfd, member);
}
}
}
static void
walk_wild (s, section, file, callback, data)
lang_wild_statement_type *s;
const char *section;
const char *file;
callback_t callback;
PTR data;
{
if (file == (char *) NULL)
{
/* Perform the iteration over all files in the list. */
LANG_FOR_EACH_INPUT_STATEMENT (f)
{
walk_wild_file (s, section, f, callback, data);
}
}
else if (wildcardp (file))
{
LANG_FOR_EACH_INPUT_STATEMENT (f)
{
if (fnmatch (file, f->filename, FNM_FILE_NAME) == 0)
walk_wild_file (s, section, f, callback, data);
}
}
else
{
lang_input_statement_type *f;
/* Perform the iteration over a single file. */
f = lookup_name (file);
walk_wild_file (s, section, f, callback, data);
}
}
/* lang_for_each_statement walks the parse tree and calls the provided
function for each node. */
static void
lang_for_each_statement_worker (func, s)
void (*func) PARAMS ((lang_statement_union_type *));
lang_statement_union_type *s;
{
for (; s != (lang_statement_union_type *) NULL; s = s->next)
{
func (s);
switch (s->header.type)
{
case lang_constructors_statement_enum:
lang_for_each_statement_worker (func, constructor_list.head);
break;
case lang_output_section_statement_enum:
lang_for_each_statement_worker
(func,
s->output_section_statement.children.head);
break;
case lang_wild_statement_enum:
lang_for_each_statement_worker
(func,
s->wild_statement.children.head);
break;
case lang_group_statement_enum:
lang_for_each_statement_worker (func,
s->group_statement.children.head);
break;
case lang_data_statement_enum:
case lang_reloc_statement_enum:
case lang_object_symbols_statement_enum:
case lang_output_statement_enum:
case lang_target_statement_enum:
case lang_input_section_enum:
case lang_input_statement_enum:
case lang_assignment_statement_enum:
case lang_padding_statement_enum:
case lang_address_statement_enum:
case lang_fill_statement_enum:
break;
default:
FAIL ();
break;
}
}
}
void
lang_for_each_statement (func)
void (*func) PARAMS ((lang_statement_union_type *));
{
lang_for_each_statement_worker (func, statement_list.head);
}
/*----------------------------------------------------------------------*/
void
lang_list_init (list)
lang_statement_list_type *list;
{
list->head = (lang_statement_union_type *) NULL;
list->tail = &list->head;
}
/* Build a new statement node for the parse tree. */
static lang_statement_union_type *
new_statement (type, size, list)
enum statement_enum type;
size_t size;
lang_statement_list_type *list;
{
lang_statement_union_type *new = (lang_statement_union_type *)
stat_alloc (size);
new->header.type = type;
new->header.next = (lang_statement_union_type *) NULL;
lang_statement_append (list, new, &new->header.next);
return new;
}
/* Build a new input file node for the language. There are several
ways in which we treat an input file, eg, we only look at symbols,
or prefix it with a -l etc.
We can be supplied with requests for input files more than once;
they may, for example be split over serveral lines like foo.o(.text)
foo.o(.data) etc, so when asked for a file we check that we haven't
got it already so we don't duplicate the bfd. */
static lang_input_statement_type *
new_afile (name, file_type, target, add_to_list)
const char *name;
lang_input_file_enum_type file_type;
const char *target;
boolean add_to_list;
{
lang_input_statement_type *p;
if (add_to_list)
p = new_stat (lang_input_statement, stat_ptr);
else
{
p = ((lang_input_statement_type *)
stat_alloc (sizeof (lang_input_statement_type)));
p->header.next = NULL;
}
lang_has_input_file = true;
p->target = target;
switch (file_type)
{
case lang_input_file_is_symbols_only_enum:
p->filename = name;
p->is_archive = false;
p->real = true;
p->local_sym_name = name;
p->just_syms_flag = true;
p->search_dirs_flag = false;
break;
case lang_input_file_is_fake_enum:
p->filename = name;
p->is_archive = false;
p->real = false;
p->local_sym_name = name;
p->just_syms_flag = false;
p->search_dirs_flag = false;
break;
case lang_input_file_is_l_enum:
p->is_archive = true;
p->filename = name;
p->real = true;
p->local_sym_name = concat ("-l", name, (const char *) NULL);
p->just_syms_flag = false;
p->search_dirs_flag = true;
break;
case lang_input_file_is_marker_enum:
p->filename = name;
p->is_archive = false;
p->real = false;
p->local_sym_name = name;
p->just_syms_flag = false;
p->search_dirs_flag = true;
break;
case lang_input_file_is_search_file_enum:
p->filename = name;
p->is_archive = false;
p->real = true;
p->local_sym_name = name;
p->just_syms_flag = false;
p->search_dirs_flag = true;
break;
case lang_input_file_is_file_enum:
p->filename = name;
p->is_archive = false;
p->real = true;
p->local_sym_name = name;
p->just_syms_flag = false;
p->search_dirs_flag = false;
break;
default:
FAIL ();
}
p->the_bfd = (bfd *) NULL;
p->asymbols = (asymbol **) NULL;
p->next_real_file = (lang_statement_union_type *) NULL;
p->next = (lang_statement_union_type *) NULL;
p->symbol_count = 0;
p->dynamic = config.dynamic_link;
p->whole_archive = whole_archive;
p->loaded = false;
lang_statement_append (&input_file_chain,
(lang_statement_union_type *) p,
&p->next_real_file);
return p;
}
lang_input_statement_type *
lang_add_input_file (name, file_type, target)
const char *name;
lang_input_file_enum_type file_type;
const char *target;
{
lang_has_input_file = true;
return new_afile (name, file_type, target, true);
}
/* Build enough state so that the parser can build its tree. */
void
lang_init ()
{
obstack_begin (&stat_obstack, 1000);
stat_ptr = &statement_list;
lang_list_init (stat_ptr);
lang_list_init (&input_file_chain);
lang_list_init (&lang_output_section_statement);
lang_list_init (&file_chain);
first_file = lang_add_input_file ((char *) NULL,
lang_input_file_is_marker_enum,
(char *) NULL);
abs_output_section =
lang_output_section_statement_lookup (BFD_ABS_SECTION_NAME);
abs_output_section->bfd_section = bfd_abs_section_ptr;
}
/*----------------------------------------------------------------------
A region is an area of memory declared with the
MEMORY { name:org=exp, len=exp ... }
syntax.
We maintain a list of all the regions here.
If no regions are specified in the script, then the default is used
which is created when looked up to be the entire data space. */
static lang_memory_region_type *lang_memory_region_list;
static lang_memory_region_type **lang_memory_region_list_tail = &lang_memory_region_list;
lang_memory_region_type *
lang_memory_region_lookup (name)
const char *const name;
{
lang_memory_region_type *p;
for (p = lang_memory_region_list;
p != (lang_memory_region_type *) NULL;
p = p->next)
{
if (strcmp (p->name, name) == 0)
{
return p;
}
}
#if 0
/* This code used to always use the first region in the list as the
default region. I changed it to instead use a region
encompassing all of memory as the default region. This permits
NOLOAD sections to work reasonably without requiring a region.
People should specify what region they mean, if they really want
a region. */
if (strcmp (name, "*default*") == 0)
{
if (lang_memory_region_list != (lang_memory_region_type *) NULL)
{
return lang_memory_region_list;
}
}
#endif
{
lang_memory_region_type *new =
(lang_memory_region_type *) stat_alloc (sizeof (lang_memory_region_type));
new->name = xstrdup (name);
new->next = (lang_memory_region_type *) NULL;
*lang_memory_region_list_tail = new;
lang_memory_region_list_tail = &new->next;
new->origin = 0;
new->flags = 0;
new->not_flags = 0;
new->length = ~(bfd_size_type) 0;
new->current = 0;
new->had_full_message = false;
return new;
}
}
static lang_memory_region_type *
lang_memory_default (section)
asection *section;
{
lang_memory_region_type *p;
flagword sec_flags = section->flags;
/* Override SEC_DATA to mean a writable section. */
if ((sec_flags & (SEC_ALLOC | SEC_READONLY | SEC_CODE)) == SEC_ALLOC)
sec_flags |= SEC_DATA;
for (p = lang_memory_region_list;
p != (lang_memory_region_type *) NULL;
p = p->next)
{
if ((p->flags & sec_flags) != 0
&& (p->not_flags & sec_flags) == 0)
{
return p;
}
}
return lang_memory_region_lookup ("*default*");
}
lang_output_section_statement_type *
lang_output_section_find (name)
const char *const name;
{
lang_statement_union_type *u;
lang_output_section_statement_type *lookup;
for (u = lang_output_section_statement.head;
u != (lang_statement_union_type *) NULL;
u = lookup->next)
{
lookup = &u->output_section_statement;
if (strcmp (name, lookup->name) == 0)
{
return lookup;
}
}
return (lang_output_section_statement_type *) NULL;
}
lang_output_section_statement_type *
lang_output_section_statement_lookup (name)
const char *const name;
{
lang_output_section_statement_type *lookup;
lookup = lang_output_section_find (name);
if (lookup == (lang_output_section_statement_type *) NULL)
{
lookup = (lang_output_section_statement_type *)
new_stat (lang_output_section_statement, stat_ptr);
lookup->region = (lang_memory_region_type *) NULL;
lookup->lma_region = (lang_memory_region_type *) NULL;
lookup->fill = 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 section, and
arrange to discard it if a section of the same name has already
been linked. If the section has COMDAT information, then it uses
that to decide whether the section should be included. This code
assumes that all relevant sections have the SEC_LINK_ONCE flag set;
that is, it does not depend solely upon the section name.
section_already_linked is called via bfd_map_over_sections. */
/* This is the shape of the elements inside the already_linked hash
table. It maps a name onto a list of already_linked elements with
the same name. It's possible to get more than one element in a
list if the COMDAT sections have different names. */
struct already_linked_hash_entry
{
struct bfd_hash_entry root;
struct already_linked *entry;
};
struct already_linked
{
struct already_linked *next;
asection *sec;
};
/* The hash table. */
static struct bfd_hash_table already_linked_table;
static void
section_already_linked (abfd, sec, data)
bfd *abfd;
asection *sec;
PTR data;
{
lang_input_statement_type *entry = (lang_input_statement_type *) data;
flagword flags;
const char *name;
struct already_linked *l;
struct already_linked_hash_entry *already_linked_list;
/* If we are only reading symbols from this object, then we want to
discard all sections. */
if (entry->just_syms_flag)
{
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;
/* FIXME: When doing a relocatable link, we may have trouble
copying relocations in other sections that refer to local symbols
in the section being discarded. Those relocations will have to
be converted somehow; as of this writing I'm not sure that any of
the backends handle that correctly.
It is tempting to instead not discard link once sections when
doing a relocatable link (technically, they should be discarded
whenever we are building constructors). However, that fails,
because the linker winds up combining all the link once sections
into a single large link once section, which defeats the purpose
of having link once sections in the first place.
Also, not merging link once sections in a relocatable link
causes trouble for MIPS ELF, which relies in link once semantics
to handle the .reginfo section correctly. */
name = bfd_get_section_name (abfd, sec);
already_linked_list =
((struct already_linked_hash_entry *)
bfd_hash_lookup (&already_linked_table, name, true, false));
for (l = already_linked_list->entry; l != NULL; l = l->next)
{
if (sec->comdat == NULL
|| l->sec->comdat == NULL
|| strcmp (sec->comdat->name, l->sec->comdat->name) == 0)
{
/* The section has already been linked. See if we should
issue a warning. */
switch (flags & SEC_LINK_DUPLICATES)
{
default:
abort ();
case SEC_LINK_DUPLICATES_DISCARD:
break;
case SEC_LINK_DUPLICATES_ONE_ONLY:
if (sec->comdat == NULL)
einfo (_("%P: %B: warning: ignoring duplicate section `%s'\n"),
abfd, name);
else
einfo (_("%P: %B: warning: ignoring duplicate `%s' section symbol `%s'\n"),
abfd, name, sec->comdat->name);
break;
case SEC_LINK_DUPLICATES_SAME_CONTENTS:
/* FIXME: We should really dig out the contents of both
sections and memcmp them. The COFF/PE spec says that
the Microsoft linker does not implement this
correctly, so I'm not going to bother doing it
either. */
/* Fall through. */
case SEC_LINK_DUPLICATES_SAME_SIZE:
if (bfd_section_size (abfd, sec)
!= bfd_section_size (l->sec->owner, l->sec))
einfo (_("%P: %B: warning: duplicate section `%s' has different size\n"),
abfd, name);
break;
}
/* Set the output_section field so that wild_doit does not
create a lang_input_section structure for this section.
Since there might be a symbol in the section being
discarded, we must retain a pointer to the section which
we are really going to use. */
sec->output_section = bfd_abs_section_ptr;
sec->kept_section = l->sec;
return;
}
}
/* This is the first section with this name. Record it. Allocate
the memory from the same obstack as the hash table is kept in. */
l = ((struct already_linked *)
bfd_hash_allocate (&already_linked_table, sizeof *l));
l->sec = sec;
l->next = already_linked_list->entry;
already_linked_list->entry = l;
}
/* Support routines for the hash table used by section_already_linked,
initialize the table, fill in an entry and remove the table. */
static struct bfd_hash_entry *
already_linked_newfunc (entry, table, string)
struct bfd_hash_entry *entry ATTRIBUTE_UNUSED;
struct bfd_hash_table *table;
const char *string ATTRIBUTE_UNUSED;
{
struct already_linked_hash_entry *ret =
bfd_hash_allocate (table, sizeof (struct already_linked_hash_entry));
ret->entry = NULL;
return (struct bfd_hash_entry *) ret;
}
static void
already_linked_table_init ()
{
if (! bfd_hash_table_init_n (&already_linked_table,
already_linked_newfunc,
42))
einfo (_("%P%F: Failed to create hash table\n"));
}
static void
already_linked_table_free ()
{
bfd_hash_table_free (&already_linked_table);
}
/* The wild routines.
These expand statements like *(.text) and foo.o to a list of
explicit actions, like foo.o(.text), bar.o(.text) and
foo.o(.text, .data). */
/* Return true if the PATTERN argument is a wildcard pattern.
Although backslashes are treated specially if a pattern contains
wildcards, we do not consider the mere presence of a backslash to
be enough to cause the 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 = ! output->bfd_section->linker_has_input;
output->bfd_section->linker_has_input = 1;
/* Add a section reference to the list. */
new = new_stat (lang_input_section, ptr);
new->section = section;
new->ifile = file;
section->output_section = output->bfd_section;
flags = section->flags;
/* We don't copy the SEC_NEVER_LOAD flag from an input section
to an output section, because we want to be able to include a
SEC_NEVER_LOAD section in the middle of an otherwise loaded
section (I don't know why we want to do this, but we do).
build_link_order in ldwrite.c handles this case by turning
the embedded SEC_NEVER_LOAD section into a fill. */
flags &= ~ SEC_NEVER_LOAD;
/* If final link, don't copy the SEC_LINK_ONCE flags, they've
already been processed. One reason to do this is that on pe
format targets, .text$foo sections go into .text and it's odd
to see .text with SEC_LINK_ONCE set. */
if (! link_info.relocateable)
flags &= ~ (SEC_LINK_ONCE | SEC_LINK_DUPLICATES);
/* If this is not the first input section, and the SEC_READONLY
flag is not currently set, then don't set it just because the
input section has it set. */
if (! first && (section->output_section->flags & SEC_READONLY) == 0)
flags &= ~ SEC_READONLY;
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;
}
/* Copy over SEC_SMALL_DATA. */
if (section->flags & SEC_SMALL_DATA)
section->output_section->flags |= SEC_SMALL_DATA;
if (section->alignment_power > output->bfd_section->alignment_power)
output->bfd_section->alignment_power = section->alignment_power;
/* If supplied an aligment, then force it. */
if (output->section_alignment != -1)
output->bfd_section->alignment_power = output->section_alignment;
if (section->flags & SEC_BLOCK)
{
section->output_section->flags |= SEC_BLOCK;
/* FIXME: This value should really be obtained from the bfd... */
output->block_value = 128;
}
}
}
/* Handle wildcard sorting. This returns the lang_input_section which
should follow the one we are going to create for SECTION and FILE,
based on the sorting requirements of WILD. It returns NULL if the
new section should just go at the end of the current list. */
static lang_statement_union_type *
wild_sort (wild, file, section)
lang_wild_statement_type *wild;
lang_input_statement_type *file;
asection *section;
{
const char *section_name;
lang_statement_union_type *l;
if (! wild->filenames_sorted && ! wild->sections_sorted)
return NULL;
section_name = bfd_get_section_name (file->the_bfd, section);
for (l = wild->children.head; l != NULL; l = l->next)
{
lang_input_section_type *ls;
if (l->header.type != lang_input_section_enum)
continue;
ls = &l->input_section;
/* Sorting by filename takes precedence over sorting by section
name. */
if (wild->filenames_sorted)
{
const char *fn, *ln;
boolean fa, la;
int i;
/* The PE support for the .idata section as generated by
dlltool assumes that files will be sorted by the name of
the archive and then the name of the file within the
archive. */
if (file->the_bfd != NULL
&& bfd_my_archive (file->the_bfd) != NULL)
{
fn = bfd_get_filename (bfd_my_archive (file->the_bfd));
fa = true;
}
else
{
fn = file->filename;
fa = false;
}
if (ls->ifile->the_bfd != NULL
&& bfd_my_archive (ls->ifile->the_bfd) != NULL)
{
ln = bfd_get_filename (bfd_my_archive (ls->ifile->the_bfd));
la = true;
}
else
{
ln = ls->ifile->filename;
la = false;
}
i = strcmp (fn, ln);
if (i > 0)
continue;
else if (i < 0)
break;
if (fa || la)
{
if (fa)
fn = file->filename;
if (la)
ln = ls->ifile->filename;
i = strcmp (fn, ln);
if (i > 0)
continue;
else if (i < 0)
break;
}
}
/* Here either the files are not sorted by name, or we are
looking at the sections for this file. */
if (wild->sections_sorted)
{
if (strcmp (section_name,
bfd_get_section_name (ls->ifile->the_bfd,
ls->section))
< 0)
break;
}
}
return l;
}
/* Expand a wild statement for a particular FILE. SECTION may be
NULL, in which case it is a wild card. */
static void
output_section_callback (ptr, section, file, output)
lang_wild_statement_type *ptr;
asection *section;
lang_input_statement_type *file;
PTR output;
{
lang_statement_union_type *before;
/* If the wild pattern was marked KEEP, the member sections
should be as well. */
if (ptr->keep_sections)
section->flags |= SEC_KEEP;
before = wild_sort (ptr, file, section);
/* Here BEFORE points to the lang_input_section which
should follow the one we are about to add. If BEFORE
is NULL, then the section should just go at the end
of the current list. */
if (before == NULL)
wild_doit (&ptr->children, section,
(lang_output_section_statement_type *) output,
file);
else
{
lang_statement_list_type list;
lang_statement_union_type **pp;
lang_list_init (&list);
wild_doit (&list, section,
(lang_output_section_statement_type *) output,
file);
/* If we are discarding the section, LIST.HEAD will
be NULL. */
if (list.head != NULL)
{
ASSERT (list.head->next == NULL);
for (pp = &ptr->children.head;
*pp != before;
pp = &(*pp)->next)
ASSERT (*pp != NULL);
list.head->next = *pp;
*pp = list.head;
}
}
}
/* This is passed a file name which must have been seen already and
added to the statement tree. We will see if it has been opened
already and had its symbols read. If not then we'll read it. */
static lang_input_statement_type *
lookup_name (name)
const char *name;
{
lang_input_statement_type *search;
for (search = (lang_input_statement_type *) input_file_chain.head;
search != (lang_input_statement_type *) NULL;
search = (lang_input_statement_type *) search->next_real_file)
{
if (search->filename == (char *) NULL && name == (char *) NULL)
return search;
if (search->filename != (char *) NULL
&& name != (char *) NULL
&& strcmp (search->filename, name) == 0)
break;
}
if (search == (lang_input_statement_type *) NULL)
search = new_afile (name, lang_input_file_is_file_enum, default_target,
false);
/* If we have already added this file, or this file is not real
(FIXME: can that ever actually happen?) or the name is NULL
(FIXME: can that ever actually happen?) don't add this file. */
if (search->loaded
|| ! search->real
|| search->filename == (const char *) NULL)
return search;
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 ();
/* See if the emulation has some special knowledge. */
if (ldemul_unrecognized_file (entry))
return;
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;
/* 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;
}
if (ldemul_recognized_file (entry))
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. 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 ATTRIBUTE_UNUSED;
lang_output_section_statement_type *output;
{
walk_wild (s, section, file, output_section_callback, (PTR) 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;
}
}
/* Return true iff target is the sought target. */
static int
get_target (target, data)
const bfd_target *target;
PTR data;
{
const char *sought = (const char *) data;
return strcmp (target->name, sought) == 0;
}
/* Like strcpy() but convert to lower case as well. */
static void
stricpy (dest, src)
char *dest;
char *src;
{
char c;
while ((c = *src++) != 0)
{
if (isupper ((unsigned char) c))
c = tolower (c);
*dest++ = c;
}
*dest = 0;
}
/* Remove the first occurance of needle (if any) in haystack
from haystack. */
static void
strcut (haystack, needle)
char *haystack;
char *needle;
{
haystack = strstr (haystack, needle);
if (haystack)
{
char *src;
for (src = haystack + strlen (needle); *src;)
*haystack++ = *src++;
*haystack = 0;
}
}
/* Compare two target format name strings.
Return a value indicating how "similar" they are. */
static int
name_compare (first, second)
char *first;
char *second;
{
char *copy1;
char *copy2;
int result;
copy1 = xmalloc (strlen (first) + 1);
copy2 = xmalloc (strlen (second) + 1);
/* Convert the names to lower case. */
stricpy (copy1, first);
stricpy (copy2, second);
/* Remove and endian strings from the name. */
strcut (copy1, "big");
strcut (copy1, "little");
strcut (copy2, "big");
strcut (copy2, "little");
/* Return a value based on how many characters match,
starting from the beginning. If both strings are
the same then return 10 * their length. */
for (result = 0; copy1[result] == copy2[result]; result++)
if (copy1[result] == 0)
{
result *= 10;
break;
}
free (copy1);
free (copy2);
return result;
}
/* Set by closest_target_match() below. */
static const bfd_target *winner;
/* Scan all the valid bfd targets looking for one that has the endianness
requirement that was specified on the command line, and is the nearest
match to the original output target. */
static int
closest_target_match (target, data)
const bfd_target *target;
PTR data;
{
const bfd_target *original = (const bfd_target *) data;
if (command_line.endian == ENDIAN_BIG
&& target->byteorder != BFD_ENDIAN_BIG)
return 0;
if (command_line.endian == ENDIAN_LITTLE
&& target->byteorder != BFD_ENDIAN_LITTLE)
return 0;
/* Must be the same flavour. */
if (target->flavour != original->flavour)
return 0;
/* If we have not found a potential winner yet, then record this one. */
if (winner == NULL)
{
winner = target;
return 0;
}
/* Oh dear, we now have two potential candidates for a successful match.
Compare their names and choose the better one. */
if (name_compare (target->name, original->name)
> name_compare (winner->name, original->name))
winner = target;
/* Keep on searching until wqe have checked them all. */
return 0;
}
/* Return the BFD target format of the first input file. */
static char *
get_first_input_target ()
{
char *target = NULL;
LANG_FOR_EACH_INPUT_STATEMENT (s)
{
if (s->header.type == lang_input_statement_enum
&& s->real)
{
ldfile_open_file (s);
if (s->the_bfd != NULL
&& bfd_check_format (s->the_bfd, bfd_object))
{
target = bfd_get_target (s->the_bfd);
if (target != NULL)
break;
}
}
}
return target;
}
/* Open the output file. */
static bfd *
open_output (name)
const char *name;
{
bfd *output;
/* Has the user told us which output format to use? */
if (output_target == (char *) NULL)
{
/* No - has the current target been set to something other than
the default? */
if (current_target != default_target)
output_target = current_target;
/* No - can we determine the format of the first input file? */
else
{
output_target = get_first_input_target ();
/* Failed - use the default output target. */
if (output_target == NULL)
output_target = default_target;
}
}
/* Has the user requested a particular endianness on the command
line? */
if (command_line.endian != ENDIAN_UNSET)
{
const bfd_target *target;
enum bfd_endian desired_endian;
/* Get the chosen target. */
target = bfd_search_for_target (get_target, (PTR) output_target);
/* If the target is not supported, we cannot do anything. */
if (target != NULL)
{
if (command_line.endian == ENDIAN_BIG)
desired_endian = BFD_ENDIAN_BIG;
else
desired_endian = BFD_ENDIAN_LITTLE;
/* See if the target has the wrong endianness. This should
not happen if the linker script has provided big and
little endian alternatives, but some scrips don't do
this. */
if (target->byteorder != desired_endian)
{
/* If it does, then see if the target provides
an alternative with the correct endianness. */
if (target->alternative_target != NULL
&& (target->alternative_target->byteorder == desired_endian))
output_target = target->alternative_target->name;
else
{
/* Try to find a target as similar as possible to
the default target, but which has the desired
endian characteristic. */
(void) bfd_search_for_target (closest_target_match,
(PTR) target);
/* Oh dear - we could not find any targets that
satisfy our requirements. */
if (winner == NULL)
einfo (_("%P: warning: could not find any targets that match endianness requirement\n"));
else
output_target = winner->name;
}
}
}
}
output = bfd_openw (name, output_target);
if (output == (bfd *) NULL)
{
if (bfd_get_error () == bfd_error_invalid_target)
einfo (_("%P%F: target %s not found\n"), output_target);
einfo (_("%P%F: cannot open output file %s: %E\n"), name);
}
delete_output_file_on_failure = true;
#if 0
output->flags |= D_PAGED;
#endif
if (! bfd_set_format (output, bfd_object))
einfo (_("%P%F:%s: can not make object file: %E\n"), name);
if (! bfd_set_arch_mach (output,
ldfile_output_architecture,
ldfile_output_machine))
einfo (_("%P%F:%s: can not set architecture: %E\n"), name);
link_info.hash = bfd_link_hash_table_create (output);
if (link_info.hash == (struct bfd_link_hash_table *) NULL)
einfo (_("%P%F: can not create link hash table: %E\n"));
bfd_set_gp_size (output, g_switch_value);
return output;
}
static void
ldlang_open_output (statement)
lang_statement_union_type *statement;
{
switch (statement->header.type)
{
case lang_output_statement_enum:
ASSERT (output_bfd == (bfd *) NULL);
output_bfd = open_output (statement->output_statement.name);
ldemul_set_output_arch ();
if (config.magic_demand_paged && !link_info.relocateable)
output_bfd->flags |= D_PAGED;
else
output_bfd->flags &= ~D_PAGED;
if (config.text_read_only)
output_bfd->flags |= WP_TEXT;
else
output_bfd->flags &= ~WP_TEXT;
if (link_info.traditional_format)
output_bfd->flags |= BFD_TRADITIONAL_FORMAT;
else
output_bfd->flags &= ~BFD_TRADITIONAL_FORMAT;
break;
case lang_target_statement_enum:
current_target = statement->target_statement.target;
break;
default:
break;
}
}
/* Open all the input files. */
static void
open_input_bfds (s, force)
lang_statement_union_type *s;
boolean force;
{
for (; s != (lang_statement_union_type *) NULL; s = s->next)
{
switch (s->header.type)
{
case lang_constructors_statement_enum:
open_input_bfds (constructor_list.head, force);
break;
case lang_output_section_statement_enum:
open_input_bfds (s->output_section_statement.children.head, force);
break;
case lang_wild_statement_enum:
/* Maybe we should load the file's symbols. */
if (s->wild_statement.filename
&& ! wildcardp (s->wild_statement.filename))
(void) lookup_name (s->wild_statement.filename);
open_input_bfds (s->wild_statement.children.head, force);
break;
case lang_group_statement_enum:
{
struct bfd_link_hash_entry *undefs;
/* We must continually search the entries in the group
until no new symbols are added to the list of undefined
symbols. */
do
{
undefs = link_info.hash->undefs_tail;
open_input_bfds (s->group_statement.children.head, true);
}
while (undefs != link_info.hash->undefs_tail);
}
break;
case lang_target_statement_enum:
current_target = s->target_statement.target;
break;
case lang_input_statement_enum:
if (s->input_statement.real)
{
lang_statement_list_type add;
s->input_statement.target = current_target;
/* If we are being called from within a group, and this
is an archive which has already been searched, then
force it to be researched unless the whole archive
has been loaded already. */
if (force
&& !s->input_statement.whole_archive
&& s->input_statement.loaded
&& bfd_check_format (s->input_statement.the_bfd,
bfd_archive))
s->input_statement.loaded = false;
lang_list_init (&add);
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 = xstrdup (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_p)
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;
unsigned opb = bfd_arch_mach_octets_per_byte (ldfile_output_architecture,
ldfile_output_machine);
if (size != 0)
{
print_space ();
minfo ("%s", i->name);
if (i->output_section != NULL)
{
int len;
len = 1 + strlen (i->name);
if (len >= SECTION_NAME_MAP_LENGTH - 1)
{
print_nl ();
len = 0;
}
while (len < SECTION_NAME_MAP_LENGTH)
{
print_space ();
++len;
}
minfo ("0x%V %W %B\n",
i->output_section->vma + i->output_offset, size / opb,
i->owner);
if (i->_cooked_size != 0 && i->_cooked_size != i->_raw_size)
{
len = SECTION_NAME_MAP_LENGTH + 3;
#ifdef BFD64
len += 16;
#else
len += 8;
#endif
while (len > 0)
{
print_space ();
--len;
}
minfo (_("%W (size before relaxing)\n"), i->_raw_size);
}
bfd_link_hash_traverse (link_info.hash, print_one_symbol, (PTR) i);
print_dot = i->output_section->vma + i->output_offset + size / opb;
}
}
}
static void
print_fill_statement (fill)
lang_fill_statement_type *fill;
{
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;
unsigned opb = bfd_arch_mach_octets_per_byte (ldfile_output_architecture,
ldfile_output_machine);
for (i = 0; i < SECTION_NAME_MAP_LENGTH; i++)
print_space ();
addr = data->output_vma;
if (data->output_section != NULL)
addr += data->output_section->vma;
switch (data->type)
{
default:
abort ();
case BYTE:
size = BYTE_SIZE;
name = "BYTE";
break;
case SHORT:
size = SHORT_SIZE;
name = "SHORT";
break;
case LONG:
size = LONG_SIZE;
name = "LONG";
break;
case QUAD:
size = QUAD_SIZE;
name = "QUAD";
break;
case SQUAD:
size = QUAD_SIZE;
name = "SQUAD";
break;
}
minfo ("0x%V %W %s 0x%v", addr, size, name, data->value);
if (data->exp->type.node_class != etree_value)
{
print_space ();
exp_print_tree (data->exp);
}
print_nl ();
print_dot = addr + size / opb;
}
/* Print an address statement. These are generated by options like
-Ttext. */
static void
print_address_statement (address)
lang_address_statement_type *address;
{
minfo (_("Address of section %s set to "), address->section_name);
exp_print_tree (address->address);
print_nl ();
}
/* Print a reloc statement. */
static void
print_reloc_statement (reloc)
lang_reloc_statement_type *reloc;
{
int i;
bfd_vma addr;
bfd_size_type size;
unsigned opb = bfd_arch_mach_octets_per_byte (ldfile_output_architecture,
ldfile_output_machine);
for (i = 0; i < SECTION_NAME_MAP_LENGTH; i++)
print_space ();
addr = reloc->output_vma;
if (reloc->output_section != NULL)
addr += reloc->output_section->vma;
size = bfd_get_reloc_size (reloc->howto);
minfo ("0x%V %W RELOC %s ", addr, size, reloc->howto->name);
if (reloc->name != NULL)
minfo ("%s+", reloc->name);
else
minfo ("%s+", reloc->section->name);
exp_print_tree (reloc->addend_exp);
print_nl ();
print_dot = addr + size / opb;
}
static void
print_padding_statement (s)
lang_padding_statement_type *s;
{
int len;
bfd_vma addr;
unsigned opb = bfd_arch_mach_octets_per_byte (ldfile_output_architecture,
ldfile_output_machine);
minfo (" *fill*");
len = sizeof " *fill*" - 1;
while (len < SECTION_NAME_MAP_LENGTH)
{
print_space ();
++len;
}
addr = s->output_offset;
if (s->output_section != NULL)
addr += s->output_section->vma;
minfo ("0x%V %W", addr, s->size);
if (s->fill != 0)
minfo (" %u", s->fill);
print_nl ();
print_dot = addr + s->size / opb;
}
static void
print_wild_statement (w, os)
lang_wild_statement_type *w;
lang_output_section_statement_type *os;
{
print_space ();
if (w->filenames_sorted)
minfo ("SORT(");
if (w->exclude_filename_list != NULL)
{
name_list *tmp;
minfo ("EXCLUDE_FILE ( %s", w->exclude_filename_list->name);
for (tmp = w->exclude_filename_list->next; tmp; tmp = tmp->next)
minfo (", %s", tmp->name);
minfo (")");
}
if (w->filename != NULL)
minfo ("%s", w->filename);
else
minfo ("*");
if (w->filenames_sorted)
minfo (")");
minfo ("(");
if (w->sections_sorted)
minfo ("SORT(");
if (w->section_name != NULL)
minfo ("%s", w->section_name);
else
minfo ("*");
if (w->sections_sorted)
minfo (")");
minfo (")");
print_nl ();
print_statement_list (w->children.head, os);
}
/* Print a group statement. */
static void
print_group (s, os)
lang_group_statement_type *s;
lang_output_section_statement_type *os;
{
fprintf (config.map_file, "START GROUP\n");
print_statement_list (s->children.head, os);
fprintf (config.map_file, "END GROUP\n");
}
/* Print the list of statements in S.
This can be called for any statement type. */
static void
print_statement_list (s, os)
lang_statement_union_type *s;
lang_output_section_statement_type *os;
{
while (s != NULL)
{
print_statement (s, os);
s = s->next;
}
}
/* Print the first statement in statement list S.
This can be called for any statement type. */
static void
print_statement (s, os)
lang_statement_union_type *s;
lang_output_section_statement_type *os;
{
switch (s->header.type)
{
default:
fprintf (config.map_file, _("Fail with %d\n"), s->header.type);
FAIL ();
break;
case lang_constructors_statement_enum:
if (constructor_list.head != NULL)
{
if (constructors_sorted)
minfo (" SORT (CONSTRUCTORS)\n");
else
minfo (" CONSTRUCTORS\n");
print_statement_list (constructor_list.head, os);
}
break;
case lang_wild_statement_enum:
print_wild_statement (&s->wild_statement, os);
break;
case lang_address_statement_enum:
print_address_statement (&s->address_statement);
break;
case lang_object_symbols_statement_enum:
minfo (" CREATE_OBJECT_SYMBOLS\n");
break;
case lang_fill_statement_enum:
print_fill_statement (&s->fill_statement);
break;
case lang_data_statement_enum:
print_data_statement (&s->data_statement);
break;
case lang_reloc_statement_enum:
print_reloc_statement (&s->reloc_statement);
break;
case lang_input_section_enum:
print_input_section (&s->input_section);
break;
case lang_padding_statement_enum:
print_padding_statement (&s->padding_statement);
break;
case lang_output_section_statement_enum:
print_output_section_statement (&s->output_section_statement);
break;
case lang_assignment_statement_enum:
print_assignment (&s->assignment_statement, os);
break;
case lang_target_statement_enum:
fprintf (config.map_file, "TARGET(%s)\n", s->target_statement.target);
break;
case lang_output_statement_enum:
minfo ("OUTPUT(%s", s->output_statement.name);
if (output_target != NULL)
minfo (" %s", output_target);
minfo (")\n");
break;
case lang_input_statement_enum:
print_input_statement (&s->input_statement);
break;
case lang_group_statement_enum:
print_group (&s->group_statement, os);
break;
case lang_afile_asection_pair_statement_enum:
FAIL ();
break;
}
}
static void
print_statements ()
{
print_statement_list (statement_list.head, abs_output_section);
}
/* Print the first N statements in statement list S to STDERR.
If N == 0, nothing is printed.
If N < 0, the entire list is printed.
Intended to be called from GDB. */
void
dprint_statement (s, n)
lang_statement_union_type *s;
int n;
{
FILE *map_save = config.map_file;
config.map_file = stderr;
if (n < 0)
print_statement_list (s, abs_output_section);
else
{
while (s && --n >= 0)
{
print_statement (s, abs_output_section);
s = s->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 opb = bfd_arch_mach_octets_per_byte (ldfile_output_architecture,
ldfile_output_machine);
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 * opb;
}
/* 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 * opb;
return dot + alignment_needed;
}
/* Work out how much this section will move the dot point. */
static bfd_vma
size_input_section (this_ptr, output_section_statement, fill, dot, relax)
lang_statement_union_type **this_ptr;
lang_output_section_statement_type *output_section_statement;
fill_type fill;
bfd_vma dot;
boolean relax ATTRIBUTE_UNUSED;
{
lang_input_section_type *is = &((*this_ptr)->input_section);
asection *i = is->section;
unsigned opb = bfd_arch_mach_octets_per_byte (ldfile_output_architecture,
ldfile_output_machine);
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 / opb;
else
dot += i->_raw_size / opb;
output_section_statement->bfd_section->_raw_size =
(dot - output_section_statement->bfd_section->vma) * opb;
}
else
{
i->output_offset = i->vma - output_section_statement->bfd_section->vma;
}
return dot;
}
#define IGNORE_SECTION(bfd, s) \
(((bfd_get_section_flags (bfd, s) & (SEC_ALLOC | SEC_LOAD)) \
!= (SEC_ALLOC | SEC_LOAD)) \
|| bfd_section_size (bfd, s) == 0)
/* Check to see if any allocated sections overlap with other allocated
sections. This can happen when the linker script specifically specifies
the output section addresses of the two sections. */
static void
lang_check_section_addresses ()
{
asection *s;
unsigned opb = bfd_octets_per_byte (output_bfd);
/* Scan all sections in the output list. */
for (s = output_bfd->sections; s != NULL; s = s->next)
{
asection *os;
/* Ignore sections which are not loaded or which have no contents. */
if (IGNORE_SECTION (output_bfd, s))
continue;
/* Once we reach section 's' stop our seach. This prevents two
warning messages from being produced, one for 'section A overlaps
section B' and one for 'section B overlaps section A'. */
for (os = output_bfd->sections; os != s; os = os->next)
{
bfd_vma s_start;
bfd_vma s_end;
bfd_vma os_start;
bfd_vma os_end;
/* Only consider loadable sections with real contents. */
if (IGNORE_SECTION (output_bfd, os))
continue;
/* We must check the sections' LMA addresses not their
VMA addresses because overlay sections can have
overlapping VMAs but they must have distinct LMAs. */
s_start = bfd_section_lma (output_bfd, s);
os_start = bfd_section_lma (output_bfd, os);
s_end = s_start + bfd_section_size (output_bfd, s) / opb - 1;
os_end = os_start + bfd_section_size (output_bfd, os) / opb - 1;
/* Look for an overlap. */
if ((s_end < os_start) || (s_start > os_end))
continue;
einfo (
_("%X%P: section %s [%V -> %V] overlaps section %s [%V -> %V]\n"),
s->name, s_start, s_end, os->name, os_start, os_end);
/* Once we have found one overlap for this section,
stop looking for others. */
break;
}
}
}
/* This variable indicates whether bfd_relax_section should be called
again. */
static boolean relax_again;
/* Make sure the new address is within the region. We explicitly permit the
current address to be at the exact end of the region when the address is
non-zero, in case the region is at the end of addressable memory and the
calculation wraps around. */
static void
os_region_check (os, region, tree, base)
lang_output_section_statement_type *os;
struct memory_region_struct *region;
etree_type *tree;
bfd_vma base;
{
if ((region->current < region->origin
|| (region->current - region->origin > region->length))
&& ((region->current != region->origin + region->length)
|| base == 0))
{
if (tree != (etree_type *) NULL)
{
einfo (_("%X%P: address 0x%v of %B section %s is not within region %s\n"),
region->current,
os->bfd_section->owner,
os->bfd_section->name,
region->name);
}
else
{
einfo (_("%X%P: region %s is full (%B section %s)\n"),
region->name,
os->bfd_section->owner,
os->bfd_section->name);
}
/* Reset the region pointer. */
region->current = region->origin;
}
}
/* Set the sizes for all the output sections. */
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;
{
unsigned opb = bfd_arch_mach_octets_per_byte (ldfile_output_architecture,
ldfile_output_machine);
/* Size up the sections from their constituent parts. */
for (; s != (lang_statement_union_type *) NULL; s = s->next)
{
switch (s->header.type)
{
case lang_output_section_statement_enum:
{
bfd_vma after;
lang_output_section_statement_type *os;
os = &s->output_section_statement;
if (os->bfd_section == NULL)
/* This section was never actually created. */
break;
/* If this is a COFF shared library section, use the size and
address from the input section. FIXME: This is COFF
specific; it would be cleaner if there were some other way
to do this, but nothing simple comes to mind. */
if ((os->bfd_section->flags & SEC_COFF_SHARED_LIBRARY) != 0)
{
asection *input;
if (os->children.head == NULL
|| os->children.head->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_p == false)
{
einfo (_("%F%S: non constant address expression for section %s\n"),
os->name);
}
dot = r.value + r.section->bfd_section->vma;
}
/* The section starts here.
First, align to what the section needs. */