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* elflink.c (elf_link_sort_relocs): If both .rela.dyn and .rel.dyn sections

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are present examine the indirect sections in an attempt to compute the
  correct relocation size.  If there is any ambiguity, produce an error and
  refuse to sort.
This commit is contained in:
Nick Clifton 2007-05-04 14:17:07 +00:00
parent bfb568882d
commit 3410fea824
2 changed files with 159 additions and 19 deletions
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7
bfd/ChangeLog
View File

@ -1,3 +1,10 @@
2007-05-04 Nick Clifton <nickc@redhat.com>
* elflink.c (elf_link_sort_relocs): If both .rela.dyn and .rel.dyn
sections are present examine the indirect sections in an attempt
to compute the correct relocation size. If there is any
ambiguity, produce an error and refuse to sort.
2007-05-03 Sandra Loosemore <sandra@codesourcery.com>
* elf32-arm.c (allocate_dynrelocs): Fix typo in comment.

171
bfd/elflink.c
View File

@ -7220,7 +7220,9 @@ elf_link_sort_cmp2 (const void *A, const void *B)
static size_t
elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
{
asection *reldyn;
asection *dynamic_relocs;
asection * rela_dyn;
asection * rel_dyn;
bfd_size_type count, size;
size_t i, ret, sort_elt, ext_size;
bfd_byte *sort, *s_non_relative, *p;
@ -7231,39 +7233,168 @@ elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
struct bfd_link_order *lo;
bfd_vma r_sym_mask;
bfd_boolean use_rela;
reldyn = bfd_get_section_by_name (abfd, ".rela.dyn");
if (reldyn == NULL || reldyn->size == 0)
/* Find a dynamic reloc section. */
rela_dyn = bfd_get_section_by_name (abfd, ".rela.dyn");
rel_dyn = bfd_get_section_by_name (abfd, ".rel.dyn");
if (rela_dyn != NULL && rela_dyn->size > 0
&& rel_dyn != NULL && rel_dyn->size > 0)
{
reldyn = bfd_get_section_by_name (abfd, ".rel.dyn");
if (reldyn == NULL || reldyn->size == 0)
return 0;
ext_size = bed->s->sizeof_rel;
swap_in = bed->s->swap_reloc_in;
swap_out = bed->s->swap_reloc_out;
bfd_boolean use_rela_initialised = FALSE;
/* This is just here to stop gcc from complaining.
It's initialization checking code is not perfect. */
use_rela = TRUE;
/* Both sections are present. Examine the sizes
of the indirect sections to help us choose. */
for (lo = rela_dyn->map_head.link_order; lo != NULL; lo = lo->next)
if (lo->type == bfd_indirect_link_order)
{
asection *o = lo->u.indirect.section;
if ((o->size % bed->s->sizeof_rela) == 0)
{
if ((o->size % bed->s->sizeof_rel) == 0)
/* Section size is divisible by both rel and rela sizes.
It is of no help to us. */
;
else
{
/* Section size is only divisible by rela. */
if (use_rela_initialised && (use_rela == FALSE))
{
_bfd_error_handler
(_("%B: Unable to sort relocs - they are in more than one size"), abfd);
bfd_set_error (bfd_error_invalid_operation);
return 0;
}
else
{
use_rela = TRUE;
use_rela_initialised = TRUE;
}
}
}
else if ((o->size % bed->s->sizeof_rel) == 0)
{
/* Section size is only divisible by rel. */
if (use_rela_initialised && (use_rela == TRUE))
{
_bfd_error_handler
(_("%B: Unable to sort relocs - they are in more than one size"), abfd);
bfd_set_error (bfd_error_invalid_operation);
return 0;
}
else
{
use_rela = FALSE;
use_rela_initialised = TRUE;
}
}
else
{
/* The section size is not divisible by either - something is wrong. */
_bfd_error_handler
(_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
bfd_set_error (bfd_error_invalid_operation);
return 0;
}
}
for (lo = rel_dyn->map_head.link_order; lo != NULL; lo = lo->next)
if (lo->type == bfd_indirect_link_order)
{
asection *o = lo->u.indirect.section;
if ((o->size % bed->s->sizeof_rela) == 0)
{
if ((o->size % bed->s->sizeof_rel) == 0)
/* Section size is divisible by both rel and rela sizes.
It is of no help to us. */
;
else
{
/* Section size is only divisible by rela. */
if (use_rela_initialised && (use_rela == FALSE))
{
_bfd_error_handler
(_("%B: Unable to sort relocs - they are in more than one size"), abfd);
bfd_set_error (bfd_error_invalid_operation);
return 0;
}
else
{
use_rela = TRUE;
use_rela_initialised = TRUE;
}
}
}
else if ((o->size % bed->s->sizeof_rel) == 0)
{
/* Section size is only divisible by rel. */
if (use_rela_initialised && (use_rela == TRUE))
{
_bfd_error_handler
(_("%B: Unable to sort relocs - they are in more than one size"), abfd);
bfd_set_error (bfd_error_invalid_operation);
return 0;
}
else
{
use_rela = FALSE;
use_rela_initialised = TRUE;
}
}
else
{
/* The section size is not divisible by either - something is wrong. */
_bfd_error_handler
(_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
bfd_set_error (bfd_error_invalid_operation);
return 0;
}
}
if (! use_rela_initialised)
/* Make a guess. */
use_rela = TRUE;
}
else if (rela_dyn == NULL || rela_dyn->size == 0)
use_rela = FALSE;
else
use_rela = TRUE;
if (use_rela)
{
dynamic_relocs = rela_dyn;
ext_size = bed->s->sizeof_rela;
swap_in = bed->s->swap_reloca_in;
swap_out = bed->s->swap_reloca_out;
}
count = reldyn->size / ext_size;
else
{
dynamic_relocs = rel_dyn;
ext_size = bed->s->sizeof_rel;
swap_in = bed->s->swap_reloc_in;
swap_out = bed->s->swap_reloc_out;
}
size = 0;
for (lo = reldyn->map_head.link_order; lo != NULL; lo = lo->next)
for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
if (lo->type == bfd_indirect_link_order)
{
asection *o = lo->u.indirect.section;
size += o->size;
}
size += lo->u.indirect.section->size;
if (size != reldyn->size)
if (size != dynamic_relocs->size)
return 0;
sort_elt = (sizeof (struct elf_link_sort_rela)
+ (i2e - 1) * sizeof (Elf_Internal_Rela));
count = dynamic_relocs->size / ext_size;
sort = bfd_zmalloc (sort_elt * count);
if (sort == NULL)
{
(*info->callbacks->warning)
@ -7276,7 +7407,7 @@ elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
else
r_sym_mask = ~(bfd_vma) 0xffffffff;
for (lo = reldyn->map_head.link_order; lo != NULL; lo = lo->next)
for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
if (lo->type == bfd_indirect_link_order)
{
bfd_byte *erel, *erelend;
@ -7293,9 +7424,11 @@ elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
erel = o->contents;
erelend = o->contents + o->size;
p = sort + o->output_offset / ext_size * sort_elt;
while (erel < erelend)
{
struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
(*swap_in) (abfd, erel, s->rela);
s->type = (*bed->elf_backend_reloc_type_class) (s->rela);
s->u.sym_mask = r_sym_mask;
@ -7326,7 +7459,7 @@ elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
for (lo = reldyn->map_head.link_order; lo != NULL; lo = lo->next)
for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
if (lo->type == bfd_indirect_link_order)
{
bfd_byte *erel, *erelend;
@ -7345,7 +7478,7 @@ elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
}
free (sort);
*psec = reldyn;
*psec = dynamic_relocs;
return ret;
}