/* ELF STT_GNU_IFUNC support.
- Copyright 2009
- Free Software Foundation, Inc.
+ Copyright (C) 2009-2014 Free Software Foundation, Inc.
This file is part of BFD, the Binary File Descriptor library.
return TRUE;
}
-/* For a STT_GNU_IFUNC symbol, create a dynamic reloc section, SRELOC,
- for the input section, SEC, and append this reloc to HEAD. */
-
-asection *
-_bfd_elf_create_ifunc_dyn_reloc (bfd *abfd, struct bfd_link_info *info,
- asection *sec, asection *sreloc,
- struct elf_dyn_relocs **head)
-{
- struct elf_dyn_relocs *p;
- struct elf_link_hash_table *htab = elf_hash_table (info);
-
- if (sreloc == NULL)
- {
- const struct elf_backend_data *bed = get_elf_backend_data (abfd);
-
- if (htab->dynobj == NULL)
- htab->dynobj = abfd;
-
- sreloc = _bfd_elf_make_dynamic_reloc_section (sec, htab->dynobj,
- bed->s->log_file_align,
- abfd,
- bed->rela_plts_and_copies_p);
- if (sreloc == NULL)
- return NULL;
- }
-
- p = *head;
- if (p == NULL || p->sec != sec)
- {
- bfd_size_type amt = sizeof *p;
-
- p = ((struct elf_dyn_relocs *) bfd_alloc (htab->dynobj, amt));
- if (p == NULL)
- return NULL;
- p->next = *head;
- *head = p;
- p->sec = sec;
- p->count = 0;
- p->pc_count = 0;
- }
- p->count += 1;
-
- return sreloc;
-}
-
/* Allocate space in .plt, .got and associated reloc sections for
dynamic relocs against a STT_GNU_IFUNC symbol definition. */
struct elf_link_hash_entry *h,
struct elf_dyn_relocs **head,
unsigned int plt_entry_size,
+ unsigned int plt_header_size,
unsigned int got_entry_size)
{
asection *plt, *gotplt, *relplt;
|| info->export_dynamic)
&& h->pointer_equality_needed)
{
- info->callbacks->einfo
+ info->callbacks->einfo
(_("%F%P: dynamic STT_GNU_IFUNC symbol `%s' with pointer "
"equality in `%B' can not be used when making an "
"executable; recompile with -fPIE and relink with -pie\n"),
htab = elf_hash_table (info);
- /* Support garbage collection against STT_GNU_IFUNC symbols. */
- if (h->plt.refcount <= 0 && h->got.refcount <= 0)
- {
- /* When building shared library, we need to handle the case
- where it is marked with regular reference, but not non-GOT
- reference. It may happen if we didn't see STT_GNU_IFUNC
- symbol at the time when checking relocations. */
- bfd_size_type count = 0;
-
- if (info->shared
- && !h->non_got_ref
- && h->ref_regular)
+ /* When building shared library, we need to handle the case where it is
+ marked with regular reference, but not non-GOT reference since the
+ non-GOT reference bit may not be set here. */
+ if (info->shared && !h->non_got_ref && h->ref_regular)
+ for (p = *head; p != NULL; p = p->next)
+ if (p->count)
{
- for (p = *head; p != NULL; p = p->next)
- count += p->count;
- if (count != 0)
- h->non_got_ref = 1;
+ h->non_got_ref = 1;
+ goto keep;
}
- if (count == 0)
- {
- h->got = htab->init_got_offset;
- h->plt = htab->init_plt_offset;
- *head = NULL;
- return TRUE;
- }
+ /* Support garbage collection against STT_GNU_IFUNC symbols. */
+ if (h->plt.refcount <= 0 && h->got.refcount <= 0)
+ {
+ h->got = htab->init_got_offset;
+ h->plt = htab->init_plt_offset;
+ *head = NULL;
+ return TRUE;
}
/* Return and discard space for dynamic relocations against it if
return TRUE;
}
+keep:
bed = get_elf_backend_data (info->output_bfd);
if (bed->rela_plts_and_copies_p)
sizeof_reloc = bed->s->sizeof_rela;
/* If this is the first .plt entry, make room for the special
first entry. */
if (plt->size == 0)
- plt->size += plt_entry_size;
+ plt->size += plt_header_size;
}
else
{
}
/* Don't update value of STT_GNU_IFUNC symbol to PLT. We need
- the original value for R_*_IRELATIVE. */
+ the original value for R_*_IRELATIVE. */
h->plt.offset = plt->size;
/* Make room for this entry in the .plt/.iplt section. */
*head = NULL;
/* Finally, allocate space. */
- for (p = *head; p != NULL; p = p->next)
- htab->irelifunc->size += p->count * sizeof_reloc;
+ p = *head;
+ if (p != NULL)
+ {
+ bfd_size_type count = 0;
+ do
+ {
+ count += p->count;
+ p = p->next;
+ }
+ while (p != NULL);
+ htab->irelifunc->size += count * sizeof_reloc;
+ }
- /* For STT_GNU_IFUNC symbol, .got.plt has the real function addres
+ /* For STT_GNU_IFUNC symbol, .got.plt has the real function address
and .got has the PLT entry adddress. We will load the GOT entry
with the PLT entry in finish_dynamic_symbol if it is used. For
branch, it uses .got.plt. For symbol value,
5. Otherwise use .got so that it can be shared among different
objects at run-time.
We only need to relocate .got entry in shared object. */
- if ((info->shared
- && (h->dynindx == -1
- || h->forced_local))
+ if (h->got.refcount <= 0
+ || (info->shared
+ && (h->dynindx == -1
+ || h->forced_local))
|| (!info->shared
&& !h->pointer_equality_needed)
|| (info->executable && info->shared)
projects / platform / upstream / binutils.git / blobdiff