384 lines
9.6 KiB
C
384 lines
9.6 KiB
C
/* ldctor.c -- constructor support routines
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Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 1998
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Free Software Foundation, Inc.
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By Steve Chamberlain <sac@cygnus.com>
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This file is part of GLD, the Gnu Linker.
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GLD is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GLD is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GLD; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#include "bfd.h"
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#include "sysdep.h"
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#include "bfdlink.h"
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#include <ctype.h>
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#include "ld.h"
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#include "ldexp.h"
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#include "ldlang.h"
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#include "ldmisc.h"
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#include "ldgram.h"
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#include "ldmain.h"
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#include "ldctor.h"
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static int ctor_prio PARAMS ((const char *));
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static int ctor_cmp PARAMS ((const PTR, const PTR));
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/* The list of statements needed to handle constructors. These are
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invoked by the command CONSTRUCTORS in the linker script. */
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lang_statement_list_type constructor_list;
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/* Whether the constructors should be sorted. Note that this is
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global for the entire link; we assume that there is only a single
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CONSTRUCTORS command in the linker script. */
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boolean constructors_sorted;
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/* The sets we have seen. */
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struct set_info *sets;
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/* Add an entry to a set. H is the entry in the linker hash table.
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RELOC is the relocation to use for an entry in the set. SECTION
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and VALUE are the value to add. This is called during the first
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phase of the link, when we are still gathering symbols together.
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We just record the information now. The ldctor_find_constructors
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function will construct the sets. */
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void
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ldctor_add_set_entry (h, reloc, name, section, value)
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struct bfd_link_hash_entry *h;
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bfd_reloc_code_real_type reloc;
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const char *name;
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asection *section;
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bfd_vma value;
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{
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struct set_info *p;
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struct set_element *e;
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struct set_element **epp;
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for (p = sets; p != (struct set_info *) NULL; p = p->next)
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if (p->h == h)
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break;
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if (p == (struct set_info *) NULL)
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{
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p = (struct set_info *) xmalloc (sizeof (struct set_info));
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p->next = sets;
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sets = p;
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p->h = h;
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p->reloc = reloc;
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p->count = 0;
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p->elements = NULL;
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}
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else
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{
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if (p->reloc != reloc)
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{
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einfo (_("%P%X: Different relocs used in set %s\n"), h->root.string);
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return;
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}
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/* Don't permit a set to be constructed from different object
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file formats. The same reloc may have different results. We
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actually could sometimes handle this, but the case is
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unlikely to ever arise. Sometimes constructor symbols are in
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unusual sections, such as the absolute section--this appears
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to be the case in Linux a.out--and in such cases we just
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assume everything is OK. */
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if (p->elements != NULL
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&& section->owner != NULL
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&& p->elements->section->owner != NULL
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&& strcmp (bfd_get_target (section->owner),
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bfd_get_target (p->elements->section->owner)) != 0)
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{
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einfo (_("%P%X: Different object file formats composing set %s\n"),
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h->root.string);
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return;
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}
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}
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e = (struct set_element *) xmalloc (sizeof (struct set_element));
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e->next = NULL;
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e->name = name;
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e->section = section;
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e->value = value;
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for (epp = &p->elements; *epp != NULL; epp = &(*epp)->next)
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;
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*epp = e;
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++p->count;
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}
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/* Get the priority of a g++ global constructor or destructor from the
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symbol name. */
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static int
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ctor_prio (name)
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const char *name;
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{
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/* The name will look something like _GLOBAL_$I$65535$test02__Fv.
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There might be extra leading underscores, and the $ characters
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might be something else. The I might be a D. */
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while (*name == '_')
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++name;
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if (strncmp (name, "GLOBAL_", sizeof "GLOBAL_" - 1) != 0)
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return -1;
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name += sizeof "GLOBAL_" - 1;
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if (name[0] != name[2])
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return -1;
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if (name[1] != 'I' && name[1] != 'D')
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return -1;
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if (! isdigit ((unsigned char) name[3]))
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return -1;
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return atoi (name + 3);
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}
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/* This function is used to sort constructor elements by priority. It
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is called via qsort. */
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static int
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ctor_cmp (p1, p2)
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const PTR p1;
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const PTR p2;
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{
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const struct set_element **pe1 = (const struct set_element **) p1;
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const struct set_element **pe2 = (const struct set_element **) p2;
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const char *n1;
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const char *n2;
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int prio1;
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int prio2;
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n1 = (*pe1)->name;
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if (n1 == NULL)
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n1 = "";
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n2 = (*pe2)->name;
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if (n2 == NULL)
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n2 = "";
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/* We need to sort in reverse order by priority. When two
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constructors have the same priority, we should maintain their
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current relative position. */
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prio1 = ctor_prio (n1);
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prio2 = ctor_prio (n2);
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/* We sort in reverse order because that is what g++ expects. */
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if (prio1 < prio2)
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return 1;
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else if (prio1 > prio2)
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return -1;
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/* Force a stable sort. */
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if (pe1 < pe2)
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return -1;
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else if (pe1 > pe2)
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return 1;
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else
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return 0;
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}
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/* This function is called after the first phase of the link and
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before the second phase. At this point all set information has
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been gathered. We now put the statements to build the sets
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themselves into constructor_list. */
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void
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ldctor_build_sets ()
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{
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static boolean called;
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lang_statement_list_type *old;
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boolean header_printed;
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struct set_info *p;
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/* The emulation code may call us directly, but we only want to do
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this once. */
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if (called)
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return;
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called = true;
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if (constructors_sorted)
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{
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for (p = sets; p != NULL; p = p->next)
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{
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int c, i;
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struct set_element *e;
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struct set_element **array;
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if (p->elements == NULL)
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continue;
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c = 0;
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for (e = p->elements; e != NULL; e = e->next)
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++c;
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array = (struct set_element **) xmalloc (c * sizeof *array);
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i = 0;
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for (e = p->elements; e != NULL; e = e->next)
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{
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array[i] = e;
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++i;
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}
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qsort (array, c, sizeof *array, ctor_cmp);
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e = array[0];
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p->elements = e;
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for (i = 0; i < c - 1; i++)
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array[i]->next = array[i + 1];
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array[i]->next = NULL;
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free (array);
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}
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}
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old = stat_ptr;
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stat_ptr = &constructor_list;
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lang_list_init (stat_ptr);
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header_printed = false;
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for (p = sets; p != (struct set_info *) NULL; p = p->next)
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{
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struct set_element *e;
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reloc_howto_type *howto;
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int reloc_size, size;
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/* If the symbol is defined, we may have been invoked from
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collect, and the sets may already have been built, so we do
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not do anything. */
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if (p->h->type == bfd_link_hash_defined
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|| p->h->type == bfd_link_hash_defweak)
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continue;
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/* For each set we build:
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set:
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.long number_of_elements
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.long element0
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...
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.long elementN
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.long 0
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except that we use the right size instead of .long. When
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generating relocateable output, we generate relocs instead of
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addresses. */
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howto = bfd_reloc_type_lookup (output_bfd, p->reloc);
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if (howto == (reloc_howto_type *) NULL)
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{
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if (link_info.relocateable)
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{
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einfo (_("%P%X: %s does not support reloc %s for set %s\n"),
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bfd_get_target (output_bfd),
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bfd_get_reloc_code_name (p->reloc),
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p->h->root.string);
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continue;
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}
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/* If this is not a relocateable link, all we need is the
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size, which we can get from the input BFD. */
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if (p->elements->section->owner != NULL)
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howto = bfd_reloc_type_lookup (p->elements->section->owner,
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p->reloc);
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if (howto == NULL)
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{
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einfo (_("%P%X: %s does not support reloc %s for set %s\n"),
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bfd_get_target (p->elements->section->owner),
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bfd_get_reloc_code_name (p->reloc),
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p->h->root.string);
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continue;
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}
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}
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reloc_size = bfd_get_reloc_size (howto);
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switch (reloc_size)
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{
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case 1: size = BYTE; break;
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case 2: size = SHORT; break;
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case 4: size = LONG; break;
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case 8:
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if (howto->complain_on_overflow == complain_overflow_signed)
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size = SQUAD;
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else
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size = QUAD;
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break;
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default:
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einfo (_("%P%X: Unsupported size %d for set %s\n"),
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bfd_get_reloc_size (howto), p->h->root.string);
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size = LONG;
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break;
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}
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lang_add_assignment (exp_assop ('=', ".",
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exp_unop (ALIGN_K,
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exp_intop (reloc_size))));
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lang_add_assignment (exp_assop ('=', p->h->root.string,
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exp_nameop (NAME, ".")));
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lang_add_data (size, exp_intop ((bfd_vma) p->count));
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for (e = p->elements; e != (struct set_element *) NULL; e = e->next)
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{
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if (config.map_file != NULL)
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{
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int len;
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if (! header_printed)
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{
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minfo (_("\nSet Symbol\n\n"));
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header_printed = true;
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}
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minfo ("%s", p->h->root.string);
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len = strlen (p->h->root.string);
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if (len >= 19)
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{
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print_nl ();
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len = 0;
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}
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while (len < 20)
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{
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print_space ();
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++len;
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}
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if (e->name != NULL)
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minfo ("%T\n", e->name);
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else
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minfo ("%G\n", e->section->owner, e->section, e->value);
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}
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/* Need SEC_KEEP for --gc-sections */
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if (! bfd_is_abs_section (e->section))
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e->section->flags |= SEC_KEEP;
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if (link_info.relocateable)
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lang_add_reloc (p->reloc, howto, e->section, e->name,
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exp_intop (e->value));
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else
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lang_add_data (size, exp_relop (e->section, e->value));
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}
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lang_add_data (size, exp_intop (0));
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}
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stat_ptr = old;
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}
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