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binutils-gdb/ld/ldlang.c
Ian Lance Taylor 7e519ffc58 * ldlang.c (wild_doit): Clear SEC_HAS_CONTENTS from a 
noload_section.
PR 13139.
1997-09-03 19:13:14 +00:00

3990 lines
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/* Linker command language support.
Copyright (C) 1991, 92, 93, 94, 95, 96, 1997 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 <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 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 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 = lang_memory_region_list;
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->length = ~(bfd_size_type)0;
new->current = 0;
new->had_full_message = false;
return new;
}
}
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;
}
void
lang_map ()
{
lang_memory_region_type *m;
minfo ("\nMemory Configuration\n\n");
fprintf (config.map_file, "%-16s %-18s %-18s\n",
"Name", "Origin", "Length");
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\n", m->length);
}
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)
{
lang_input_section_type *new;
if (output->bfd_section == NULL)
init_os (output);
/* 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;
/* 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.
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. */
section->output_section->flags |=
section->flags & (flagword) (~ (SEC_NEVER_LOAD
| (! link_info.relocateable
? SEC_LINK_ONCE | SEC_LINK_DUPLICATES
: 0)));
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 | SEC_HAS_CONTENTS);
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)
{
os->region = lang_memory_region_lookup ("*default*");
}
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);
}
}
}
/* 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)
einfo ("%P: warning: %s architecture of input file `%B' is incompatible with %s output\n",
bfd_printable_name (input_bfd), input_bfd,
bfd_printable_name (output_bfd));
else if (! bfd_merge_private_bfd_data (input_bfd, output_bfd))
{
einfo ("%E%X: failed to merge target specific data of file %B\n", input_bfd);
}
}
}
/* 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->_raw_size = ALIGN_N (section->_raw_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->_raw_size;
/* Increase the size of the section. */
section->_raw_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)
int *ptr;
CONST char *flags;
{
boolean state = false;
*ptr = 0;
while (*flags)
{
if (*flags == '!')
{
state = false;
flags++;
}
else
state = true;
switch (*flags)
{
case 'R':
/* ptr->flag_read = state; */
break;
case 'W':
/* ptr->flag_write = state; */
break;
case 'X':
/* ptr->flag_executable= state;*/
break;
case 'L':
case 'I':
/* ptr->flag_loadable= state;*/
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 (*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->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);
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);
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);
}
}
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;
}
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