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* ldctor.c (ldctor_add_set_entry): Don't dump core if a

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constructor entry is in the absolute section.
This commit is contained in:
Ian Lance Taylor 1995-01-24 15:34:16 +00:00
parent e1dbfef664
commit 6ade1673fc
2 changed files with 186 additions and 112 deletions
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5
ld/ChangeLog
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@ -1,3 +1,8 @@
Tue Jan 24 10:32:15 1995 Ian Lance Taylor <ian@sanguine.cygnus.com>
* ldctor.c (ldctor_add_set_entry): Don't dump core if a
constructor entry is in the absolute section.
Mon Jan 23 13:58:13 1995 Ian Lance Taylor <ian@sanguine.cygnus.com>
* configure.in (i[345]86-*-gnu*): Set ld_target to i386-gnu.

293
ld/ldctor.c
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@ -1,10 +1,12 @@
/* Copyright (C) 1991 Free Software Foundation, Inc.
/* ldctor.c -- constructor support routines
Copyright (C) 1991, 92, 93, 94 Free Software Foundation, Inc.
By Steve Chamberlain <sac@cygnus.com>
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)
the Free Software Foundation; either version 2, or (at your option)
any later version.
GLD is distributed in the hope that it will be useful,
@ -16,140 +18,207 @@ 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
/*
* By steve chamberlain
* steve@cygnus.com
*/
#include "bfd.h"
#include "sysdep.h"
#include "sysdep.h"
#include "bfdlink.h"
#include "ld.h"
#include "ldexp.h"
#include "ldlang.h"
#include "ldsym.h"
#include "ldmisc.h"
#include "ldgram.h"
#include "ldmain.h"
#include "ldctor.h"
/* exported list of statements needed to handle constructors */
/* The list of statements needed to handle constructors. These are
invoked by the command CONSTRUCTORS in the linker script. */
lang_statement_list_type constructor_list;
/* We keep a list of these structures for each sets we build. */
typedef struct constructor_list
struct set_info
{
CONST char *name;
struct constructor_list *next;
} constructor_list_type;
static constructor_list_type *constructor_name_list;
struct set_info *next; /* Next set. */
struct bfd_link_hash_entry *h; /* Hash table entry. */
bfd_reloc_code_real_type reloc; /* Reloc to use for an entry. */
size_t count; /* Number of elements. */
struct set_element *elements; /* Elements in set. */
};
static void
add_constructor_name (name)
CONST char *name;
struct set_element
{
register constructor_list_type *ptr = constructor_name_list;
for (; ptr != (constructor_list_type *)NULL; ptr = ptr->next) {
if (strcmp (ptr->name, name) == 0)
return;
struct set_element *next; /* Next element. */
asection *section; /* Section of value. */
bfd_vma value; /* Value. */
};
/* The sets we have seen. */
static struct set_info *sets;
/* Add an entry to a set. H is the entry in the linker hash table.
RELOC is the relocation to use for an entry in the set. SECTION
and VALUE are the value to add. This is called during the first
phase of the link, when we are still gathering symbols together.
We just record the information now. The ldctor_find_constructors
function will construct the sets. */
void
ldctor_add_set_entry (h, reloc, section, value)
struct bfd_link_hash_entry *h;
bfd_reloc_code_real_type reloc;
asection *section;
bfd_vma value;
{
struct set_info *p;
struct set_element *e;
struct set_element **epp;
for (p = sets; p != (struct set_info *) NULL; p = p->next)
if (p->h == h)
break;
if (p == (struct set_info *) NULL)
{
p = (struct set_info *) xmalloc (sizeof (struct set_info));
p->next = sets;
sets = p;
p->h = h;
p->reloc = reloc;
p->count = 0;
p->elements = NULL;
}
else
{
if (p->reloc != reloc)
{
einfo ("%P%X: Different relocs used in set %s\n", h->root.string);
return;
}
/* Don't permit a set to be constructed from different object
file formats. The same reloc may have different results. We
actually could sometimes handle this, but the case is
unlikely to ever arise. Sometimes constructor symbols are in
unusual sections, such as the absolute section--this appears
to be the case in Linux a.out--and in such cases we just
assume everything is OK. */
if (p->elements != NULL
&& section->owner != NULL
&& p->elements->section->owner != NULL
&& strcmp (bfd_get_target (section->owner),
bfd_get_target (p->elements->section->owner)) != 0)
{
einfo ("%P%X: Different object file formats composing set %s\n",
h->root.string);
return;
}
}
/* There isn't an entry, so add one */
ptr = (constructor_list_type *) ldmalloc (sizeof(constructor_list_type));
ptr->next = constructor_name_list;
ptr->name = name;
constructor_name_list = ptr;
e = (struct set_element *) xmalloc (sizeof (struct set_element));
e->next = NULL;
e->section = section;
e->value = value;
for (epp = &p->elements; *epp != NULL; epp = &(*epp)->next)
;
*epp = e;
++p->count;
}
void
ldlang_add_constructor (name)
ldsym_type *name;
{
if (name->flags & SYM_CONSTRUCTOR) return;
add_constructor_name (name->name);
name->flags |= SYM_CONSTRUCTOR;
}
/* this function looks through the sections attached to the supplied
bfd to see if any of them are magical constructor sections. If so
their names are remembered and added to the list of constructors */
/* This function is called after the first phase of the link and
before the second phase. At this point all set information has
been gathered. We now put the statements to build the sets
themselves into constructor_list. */
void
ldlang_check_for_constructors (entry)
struct lang_input_statement_struct *entry;
ldctor_build_sets ()
{
asection *section;
lang_statement_list_type *old;
struct set_info *p;
for (section = entry->the_bfd->sections;
section != (asection *)NULL;
section = section->next)
old = stat_ptr;
stat_ptr = &constructor_list;
lang_list_init (stat_ptr);
for (p = sets; p != (struct set_info *) NULL; p = p->next)
{
if (section->flags & SEC_CONSTRUCTOR)
add_constructor_name (section->name);
}
}
struct set_element *e;
reloc_howto_type *howto;
int size;
/* If the symbol is defined, we may have been invoked from
collect, and the sets may already have been built, so we do
not do anything. */
if (p->h->type == bfd_link_hash_defined)
continue;
/* run through the symbol table, find all the symbols which are
constructors and for each one, create statements to do something
like..
for something like "__CTOR_LIST__, foo" in the assembler
__CTOR_LIST__ = . ;
LONG(__CTOR_LIST_END - . / 4 - 2)
*(foo)
__CTOR_LIST_END= .
Put these statements onto a special list.
*/
void
find_constructors ()
{
lang_statement_list_type *old = stat_ptr;
constructor_list_type *p = constructor_name_list;
stat_ptr = & constructor_list;
lang_list_init(stat_ptr);
while (p != (constructor_list_type *)NULL)
{
/* Have we already done this one ? */
CONST char *name = p->name;
ldsym_type *lookup = ldsym_get_soft(name);
/* If ld is invoked from collect, then the constructor list
will already have been defined, so don't do it again. */
if (lookup->sdefs_chain == (asymbol **)NULL)
/* For each set we build:
set:
.long number_of_elements
.long element0
...
.long elementN
.long 0
except that we use the right size instead of .long. When
generating relocateable output, we generate relocs instead of
addresses. */
howto = bfd_reloc_type_lookup (output_bfd, p->reloc);
if (howto == (reloc_howto_type *) NULL)
{
if (link_info.relocateable)
{
size_t len = strlen(name);
char *end = ldmalloc(len+3);
strcpy(end, name);
strcat(end,"$e");
lang_add_assignment
( exp_assop('=',name, exp_nameop(NAME,".")));
lang_add_data
(LONG, exp_binop('-',
exp_binop ( '/',
exp_binop ( '-',
exp_nameop(NAME, end),
exp_nameop(NAME,".")),
exp_intop(4)),
exp_intop(2)));
lang_add_wild(name, (char *)NULL);
lang_add_data(LONG, exp_intop(0));
lang_add_assignment
(exp_assop('=', end, exp_nameop(NAME,".")));
einfo ("%P%X: %s does not support reloc %s for set %s\n",
bfd_get_target (output_bfd),
bfd_get_reloc_code_name (p->reloc),
p->h->root.string);
continue;
}
p = p->next;
}
stat_ptr = old;
}
/* If this is not a relocateable link, all we need is the
size, which we can get from the input BFD. */
howto = bfd_reloc_type_lookup (p->elements->section->owner,
p->reloc);
if (howto == NULL)
{
einfo ("%P%X: %s does not support reloc %s for set %s\n",
bfd_get_target (p->elements->section->owner),
bfd_get_reloc_code_name (p->reloc),
p->h->root.string);
continue;
}
}
switch (bfd_get_reloc_size (howto))
{
case 1: size = BYTE; break;
case 2: size = SHORT; break;
case 4: size = LONG; break;
case 8: size = QUAD; break;
default:
einfo ("%P%X: Unsupported size %d for set %s\n",
bfd_get_reloc_size (howto), p->h->root.string);
size = LONG;
break;
}
lang_add_assignment (exp_assop ('=', p->h->root.string,
exp_nameop (NAME, ".")));
lang_add_data (size, exp_intop ((bfd_vma) p->count));
for (e = p->elements; e != (struct set_element *) NULL; e = e->next)
{
if (link_info.relocateable)
lang_add_reloc (p->reloc, howto, e->section,
(const char *) NULL, exp_intop (e->value));
else
lang_add_data (size, exp_relop (e->section, e->value));
}
lang_add_data (size, exp_intop (0));
}
stat_ptr = old;
}