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--split-by-reloc, --split-by-file extensions. --unique option.

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This commit is contained in:
Alan Modra 2000-09-05 03:05:19 +00:00
parent 1bd916895e
commit a854a4a7c8
7 changed files with 165 additions and 106 deletions
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30
ld/ChangeLog
View File

@ -1,3 +1,33 @@
2000-09-05 Alan Modra <alan@linuxcare.com.au>
* ld.h (ld_config_type): Add unique_orphan_sections.
* lexsup.c (OPTION_UNIQUE): Define.
(ld_options): Add "--unique".
(parse_args): Handle it.
* emultempl/elf32.em (gld${EMULATION_NAME}_place_orphan): Don't
search for an existing output section if unique_orphan_sections is
set. Make use of bfd_get_unique_section_name rather than
duplicating code here.
* ld.texinfo: Describe --unique.
* lexsup.c (ld_options): Make split-by-reloc arg optional. Add
optional arg to split-by-file.
(parse_args): Handle them.
* ld.texinfo: Update description of these options.
* ldwrite.c (clone_section): Pass in the section name. Replace
local code with bfd_get_unique_section_name.
(split_sections): Tidy code and comments. Use a list traversal
more appropriate to the list construction. Handle cooked section
sizes. Split when split_by_reloc reached rather than exceeded.
Track section size and split when split_by_file reached. Fix
link_order_tail (even though it's not used).
(ldwrite): Modify condition for calling split_sections to suit
changed split_by_reloc and split_by_file.
* ldmain.c (main): Init config.split_by_reloc and
config.split_by_file to -1.
* ld.h (ld_config_type): Change split_by_reloc to unsigned.
Change split_by_file to bfd_size_type.
2000-09-02 Nick Clifton <nickc@redhat.com>
* configure.in: Increase version number to 2.10.91.

28
ld/emultempl/elf32.em
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@ -1012,23 +1012,28 @@ gld${EMULATION_NAME}_place_orphan (file, s)
lang_statement_list_type *old = NULL;
lang_statement_list_type add;
etree_type *address;
const char *secname, *ps = NULL;
const char *secname;
const char *outsecname;
const char *ps = NULL;
lang_output_section_statement_type *os;
secname = bfd_get_section_name (s->owner, s);
if (! config.unique_orphan_sections)
{
/* Look through the script to see where to place this section. */
os = lang_output_section_find (secname);
if (os != NULL
&& os->bfd_section != NULL
&& ((s->flags ^ os->bfd_section->flags) & (SEC_LOAD | SEC_ALLOC)) == 0)
&& ((s->flags ^ os->bfd_section->flags)
& (SEC_LOAD | SEC_ALLOC)) == 0)
{
/* We have already placed a section with this name. */
wild_doit (&os->children, s, os, file);
return true;
}
}
if (hold_text.os == NULL)
hold_text.os = lang_output_section_find (".text");
@ -1087,24 +1092,7 @@ gld${EMULATION_NAME}_place_orphan (file, s)
loadable or allocateable characteristics. */
outsecname = secname;
if (bfd_get_section_by_name (output_bfd, outsecname) != NULL)
{
unsigned int len;
char *newname;
unsigned int i;
len = strlen (outsecname);
newname = xmalloc (len + 5);
strcpy (newname, outsecname);
i = 0;
do
{
sprintf (newname + len, "%d", i);
++i;
}
while (bfd_get_section_by_name (output_bfd, newname) != NULL);
outsecname = newname;
}
outsecname = bfd_get_unique_section_name (output_bfd, outsecname, NULL);
if (place != NULL)
{

8
ld/ld.h
View File

@ -206,8 +206,12 @@ typedef struct
boolean stats;
int split_by_reloc;
boolean split_by_file;
/* If set, orphan input sections will be mapped to separate output
sections. */
boolean unique_orphan_sections;
unsigned int split_by_reloc;
bfd_size_type split_by_file;
} ld_config_type;
extern ld_config_type config;

21
ld/ld.texinfo
View File

@ -692,6 +692,14 @@ with @samp{-Ur}; once the constructor table has been built, it cannot
be added to. Use @samp{-Ur} only for the last partial link, and
@samp{-r} for the others.
@kindex --unique
@item --unique
Creates a separate output section for every orphan input section. This
option prevents the normal merging of orphan input sections with the same
name. An orphan section is one not specifically mentioned in a linker
script, so this option along with a custom linker script allows any
selection of input sections to be merged while others are kept separate.
@kindex -v
@kindex -V
@kindex --version
@ -1135,22 +1143,23 @@ everything else. This is to prevent gaps between symbols due to
alignment constraints.
@kindex --split-by-file
@item --split-by-file
@item --split-by-file [@var{size}]
Similar to @code{--split-by-reloc} but creates a new output section for
each input file.
each input file when @var{size} is reached. @var{size} defaults to a
size of 1 if not given.
@kindex --split-by-reloc
@item --split-by-reloc @var{count}
Trys to creates extra sections in the output file so that no single
@item --split-by-reloc [@var{count}]
Tries to creates extra sections in the output file so that no single
output section in the file contains more than @var{count} relocations.
This is useful when generating huge relocatable for downloading into
This is useful when generating huge relocatable files for downloading into
certain real time kernels with the COFF object file format; since COFF
cannot represent more than 65535 relocations in a single section. Note
that this will fail to work with object file formats which do not
support arbitrary sections. The linker will not split up individual
input sections for redistribution, so if a single input section contains
more than @var{count} relocations one output section will contain that
many relocations.
many relocations. @var{count} defaults to a value of 32768.
@kindex --stats
@item --stats

2
ld/ldmain.c
View File

@ -200,6 +200,8 @@ main (argc, argv)
config.build_constructors = true;
config.dynamic_link = false;
config.has_shared = false;
config.split_by_reloc = (unsigned) -1;
config.split_by_file = (bfd_size_type) -1;
command_line.force_common_definition = false;
command_line.interpreter = NULL;
command_line.rpath = NULL;

142
ld/ldwrite.c
View File

@ -1,5 +1,5 @@
/* ldwrite.c -- write out the linked file
Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 1998
Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 2000
Free Software Foundation, Inc.
Written by Steve Chamberlain sac@cygnus.com
@ -33,7 +33,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "ldmain.h"
static void build_link_order PARAMS ((lang_statement_union_type *));
static asection *clone_section PARAMS ((bfd *, asection *, int *));
static asection *clone_section PARAMS ((bfd *, asection *, const char *, int *));
static void split_sections PARAMS ((bfd *, struct bfd_link_info *));
/* Build link_order structures for the BFD linker. */
@ -297,40 +297,35 @@ build_link_order (statement)
/* Wander around the input sections, make sure that
we'll never try and create an output section with more relocs
than will fit.. Do this by always assuming the worst case, and
creating new output sections with all the right bits */
creating new output sections with all the right bits. */
#define TESTIT 1
static asection *
clone_section (abfd, s, count)
clone_section (abfd, s, name, count)
bfd *abfd;
asection *s;
const char *name;
int *count;
{
char sname[8]; /* ?? find the name for this size */
char template[6];
char *sname;
asection *n;
struct bfd_link_hash_entry *h;
/* Invent a section name - use first five
chars of base section name and a digit suffix */
do
{
unsigned int i;
char b[6];
for (i = 0; i < sizeof (b) - 1 && s->name[i]; i++)
b[i] = s->name[i];
b[i] = 0;
sprintf (sname, "%s%d", b, (*count)++);
}
while (bfd_get_section_by_name (abfd, sname));
n = bfd_make_section_anyway (abfd, xstrdup (sname));
/* Invent a section name from the first five chars of the base
section name and a digit suffix. */
strncpy (template, name, sizeof (template) - 1);
template[sizeof (template) - 1] = '\0';
sname = bfd_get_unique_section_name (abfd, template, count);
/* Create a symbol of the same name */
n = bfd_make_section_anyway (abfd, sname);
/* Create a symbol of the same name. */
h = bfd_link_hash_lookup (link_info.hash,
sname, true, true, false);
h->type = bfd_link_hash_defined;
h->u.def.value = 0;
h->u.def.section = n ;
h->u.def.section = n;
n->flags = s->flags;
n->vma = s->vma;
@ -409,27 +404,27 @@ split_sections (abfd, info)
asection *original_sec;
int nsecs = abfd->section_count;
sanity_check (abfd);
/* look through all the original sections */
/* Look through all the original sections. */
for (original_sec = abfd->sections;
original_sec && nsecs;
original_sec = original_sec->next, nsecs--)
{
boolean first = true;
int count = 0;
int lines = 0;
int relocs = 0;
struct bfd_link_order **pp;
unsigned int lines = 0;
unsigned int relocs = 0;
bfd_size_type sec_size = 0;
struct bfd_link_order *l;
struct bfd_link_order *p;
bfd_vma vma = original_sec->vma;
bfd_vma shift_offset = 0;
asection *cursor = original_sec;
/* count up the relocations and line entries to see if
anything would be too big to fit */
for (pp = &(cursor->link_order_head); *pp; pp = &((*pp)->next))
/* Count up the relocations and line entries to see if anything
would be too big to fit. Accumulate section size too. */
for (l = NULL, p = cursor->link_order_head; p != NULL; p = l->next)
{
struct bfd_link_order *p = *pp;
int thislines = 0;
int thisrelocs = 0;
unsigned int thislines = 0;
unsigned int thisrelocs = 0;
bfd_size_type thissize = 0;
if (p->type == bfd_indirect_link_order)
{
asection *sec;
@ -443,63 +438,81 @@ split_sections (abfd, info)
if (info->relocateable)
thisrelocs = sec->reloc_count;
if (sec->_cooked_size != 0)
thissize = sec->_cooked_size;
else
thissize = sec->_raw_size;
}
else if (info->relocateable
&& (p->type == bfd_section_reloc_link_order
|| p->type == bfd_symbol_reloc_link_order))
thisrelocs++;
if (! first
&& (thisrelocs + relocs > config.split_by_reloc
|| thislines + lines > config.split_by_reloc
|| config.split_by_file))
if (l != NULL
&& (thisrelocs + relocs >= config.split_by_reloc
|| thislines + lines >= config.split_by_reloc
|| thissize + sec_size >= config.split_by_file))
{
/* create a new section and put this link order and the
following link orders into it */
struct bfd_link_order *l = p;
asection *n = clone_section (abfd, cursor, &count);
*pp = NULL; /* Snip off link orders from old section */
n->link_order_head = l; /* attach to new section */
pp = &n->link_order_head;
/* Create a new section and put this link order and the
following link orders into it. */
bfd_vma shift_offset;
asection *n;
/* change the size of the original section and
update the vma of the new one */
n = clone_section (abfd, cursor, original_sec->name, &count);
/* Attach the link orders to the new section and snip
them off from the old section. */
n->link_order_head = p;
n->link_order_tail = cursor->link_order_tail;
cursor->link_order_tail = l;
l->next = NULL;
l = p;
/* Change the size of the original section and
update the vma of the new one. */
dump ("before snip", cursor, n);
n->_raw_size = cursor->_raw_size - l->offset;
cursor->_raw_size = l->offset;
shift_offset = p->offset;
if (cursor->_cooked_size != 0)
{
n->_cooked_size = cursor->_cooked_size - shift_offset;
cursor->_cooked_size = shift_offset;
}
n->_raw_size = cursor->_raw_size - shift_offset;
cursor->_raw_size = shift_offset;
vma += cursor->_raw_size;
vma += shift_offset;
n->lma = n->vma = vma;
shift_offset = l->offset;
/* run down the chain and change the output section to
the right one, update the offsets too */
while (l)
/* Run down the chain and change the output section to
the right one, update the offsets too. */
do
{
l->offset -= shift_offset;
if (l->type == bfd_indirect_link_order)
p->offset -= shift_offset;
if (p->type == bfd_indirect_link_order)
{
l->u.indirect.section->output_section = n;
l->u.indirect.section->output_offset = l->offset;
p->u.indirect.section->output_section = n;
p->u.indirect.section->output_offset = p->offset;
}
l = l->next;
p = p->next;
}
while (p);
dump ("after snip", cursor, n);
cursor = n;
relocs = thisrelocs;
lines = thislines;
sec_size = thissize;
}
else
{
l = p;
relocs += thisrelocs;
lines += thislines;
sec_size += thissize;
}
first = false;
}
}
sanity_check (abfd);
@ -509,11 +522,12 @@ void
ldwrite ()
{
/* Reset error indicator, which can typically something like invalid
format from openning up the .o files */
format from opening up the .o files. */
bfd_set_error (bfd_error_no_error);
lang_for_each_statement (build_link_order);
if (config.split_by_reloc || config.split_by_file)
if (config.split_by_reloc != (unsigned) -1
|| config.split_by_file != (bfd_size_type) -1)
split_sections (output_bfd, &link_info);
if (!bfd_final_link (output_bfd, &link_info))
{

22
ld/lexsup.c
View File

@ -125,6 +125,7 @@ int parsing_defsym = 0;
#define OPTION_INIT (OPTION_NO_UNDEFINED + 1)
#define OPTION_FINI (OPTION_INIT + 1)
#define OPTION_SECTION_START (OPTION_FINI + 1)
#define OPTION_UNIQUE (OPTION_SECTION_START + 1)
/* The long options. This structure is used for both the option
parsing and the help text. */
@ -224,6 +225,8 @@ static const struct ld_option ld_options[] =
'T', N_("FILE"), N_("Read linker script"), TWO_DASHES },
{ {"undefined", required_argument, NULL, 'u'},
'u', N_("SYMBOL"), N_("Start with undefined reference to SYMBOL"), TWO_DASHES },
{ {"unique", no_argument, NULL, OPTION_UNIQUE},
'\0', NULL, N_("Don't merge orphan sections with the same name"), TWO_DASHES },
{ {"Ur", no_argument, NULL, OPTION_UR},
'\0', NULL, N_("Build global constructor/destructor tables"), ONE_DASH },
{ {"version", no_argument, NULL, OPTION_VERSION},
@ -326,10 +329,10 @@ static const struct ld_option ld_options[] =
'\0', NULL, N_("Sort common symbols by size"), TWO_DASHES },
{ {"sort_common", no_argument, NULL, OPTION_SORT_COMMON},
'\0', NULL, NULL, NO_HELP },
{ {"split-by-file", no_argument, NULL, OPTION_SPLIT_BY_FILE},
'\0', NULL, N_("Split output sections for each file"), TWO_DASHES },
{ {"split-by-reloc", required_argument, NULL, OPTION_SPLIT_BY_RELOC},
'\0', N_("COUNT"), N_("Split output sections every COUNT relocs"), TWO_DASHES },
{ {"split-by-file", optional_argument, NULL, OPTION_SPLIT_BY_FILE},
'\0', N_("[=SIZE]"), N_("Split output sections every SIZE octets"), TWO_DASHES },
{ {"split-by-reloc", optional_argument, NULL, OPTION_SPLIT_BY_RELOC},
'\0', N_("[=COUNT]"), N_("Split output sections every COUNT relocs"), TWO_DASHES },
{ {"stats", no_argument, NULL, OPTION_STATS},
'\0', NULL, N_("Print memory usage statistics"), TWO_DASHES },
{ {"task-link", required_argument, NULL, OPTION_TASK_LINK},
@ -917,6 +920,9 @@ parse_args (argc, argv)
case 'u':
ldlang_add_undef (optarg);
break;
case OPTION_UNIQUE:
config.unique_orphan_sections = true;
break;
case OPTION_VERBOSE:
ldversion (1);
version_printed = true;
@ -1005,10 +1011,16 @@ the GNU General Public License. This program has absolutely no warranty.\n"));
add_ysym (optarg);
break;
case OPTION_SPLIT_BY_RELOC:
if (optarg != NULL)
config.split_by_reloc = strtoul (optarg, NULL, 0);
else
config.split_by_reloc = 32768;
break;
case OPTION_SPLIT_BY_FILE:
config.split_by_file = true;
if (optarg != NULL)
config.split_by_file = bfd_scan_vma (optarg, NULL, 0);
else
config.split_by_file = 1;
break;
case OPTION_CHECK_SECTIONS:
command_line.check_section_addresses = true;