/* ELF linking support for BFD.
Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
- 2005, 2006, 2007 Free Software Foundation, Inc.
+ 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
This file is part of BFD, the Binary File Descriptor library.
(*_bfd_error_handler)
(_("%B: relocation size mismatch in %B section %A"),
output_bfd, input_section->owner, input_section);
- bfd_set_error (bfd_error_wrong_object_format);
+ bfd_set_error (bfd_error_wrong_format);
return FALSE;
}
default:
{
if (! (o->flags & SEC_EXCLUDE)
+ && ! (o->output_section->flags & SEC_NEVER_LOAD)
&& ! bfd_set_section_contents (output_bfd, o->output_section,
contents,
(file_ptr) o->output_offset,
/* COOKIE->rel describes a relocation against section SEC, which is
a section we've decided to keep. Mark the section that contains
- the relocation symbol. IS_EH is true if the mark comes from
- .eh_frame. */
+ the relocation symbol. */
bfd_boolean
_bfd_elf_gc_mark_reloc (struct bfd_link_info *info,
asection *sec,
elf_gc_mark_hook_fn gc_mark_hook,
- struct elf_reloc_cookie *cookie,
- bfd_boolean is_eh)
+ struct elf_reloc_cookie *cookie)
{
asection *rsec;
{
if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour)
rsec->gc_mark = 1;
- else if (is_eh)
- rsec->gc_mark_from_eh = 1;
else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook))
return FALSE;
}
elf_gc_mark_hook_fn gc_mark_hook)
{
bfd_boolean ret;
- bfd_boolean is_eh;
- asection *group_sec;
+ asection *group_sec, *eh_frame;
sec->gc_mark = 1;
/* Look through the section relocs. */
ret = TRUE;
- is_eh = strcmp (sec->name, ".eh_frame") == 0;
- if ((sec->flags & SEC_RELOC) != 0 && sec->reloc_count > 0)
+ eh_frame = elf_eh_frame_section (sec->owner);
+ if ((sec->flags & SEC_RELOC) != 0
+ && sec->reloc_count > 0
+ && sec != eh_frame)
{
struct elf_reloc_cookie cookie;
else
{
for (; cookie.rel < cookie.relend; cookie.rel++)
- if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook,
- &cookie, is_eh))
+ if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, &cookie))
{
ret = FALSE;
break;
fini_reloc_cookie_for_section (&cookie, sec);
}
}
+
+ if (ret && eh_frame && elf_fde_list (sec))
+ {
+ struct elf_reloc_cookie cookie;
+
+ if (!init_reloc_cookie_for_section (&cookie, info, eh_frame))
+ ret = FALSE;
+ else
+ {
+ if (!_bfd_elf_gc_mark_fdes (info, sec, eh_frame,
+ gc_mark_hook, &cookie))
+ ret = FALSE;
+ fini_reloc_cookie_for_section (&cookie, eh_frame);
+ }
+ }
+
return ret;
}
return TRUE;
}
+/* Keep all sections containing symbols undefined on the command-line,
+ and the section containing the entry symbol. */
+
+void
+_bfd_elf_gc_keep (struct bfd_link_info *info)
+{
+ struct bfd_sym_chain *sym;
+
+ for (sym = info->gc_sym_list; sym != NULL; sym = sym->next)
+ {
+ struct elf_link_hash_entry *h;
+
+ h = elf_link_hash_lookup (elf_hash_table (info), sym->name,
+ FALSE, FALSE, FALSE);
+
+ if (h != NULL
+ && (h->root.type == bfd_link_hash_defined
+ || h->root.type == bfd_link_hash_defweak)
+ && !bfd_is_abs_section (h->root.u.def.section))
+ h->root.u.def.section->flags |= SEC_KEEP;
+ }
+}
+
/* Do mark and sweep of unused sections. */
bfd_boolean
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
if (!bed->can_gc_sections
- || info->relocatable
- || info->emitrelocations
|| !is_elf_hash_table (info->hash))
{
(*_bfd_error_handler)(_("Warning: gc-sections option ignored"));
return TRUE;
}
+ bed->gc_keep (info);
+
+ /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
+ at the .eh_frame section if we can mark the FDEs individually. */
+ _bfd_elf_begin_eh_frame_parsing (info);
+ for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
+ {
+ asection *sec;
+ struct elf_reloc_cookie cookie;
+
+ sec = bfd_get_section_by_name (sub, ".eh_frame");
+ if (sec && init_reloc_cookie_for_section (&cookie, info, sec))
+ {
+ _bfd_elf_parse_eh_frame (sub, info, sec, &cookie);
+ if (elf_section_data (sec)->sec_info)
+ elf_eh_frame_section (sub) = sec;
+ fini_reloc_cookie_for_section (&cookie, sec);
+ }
+ }
+ _bfd_elf_end_eh_frame_parsing (info);
+
/* Apply transitive closure to the vtable entry usage info. */
elf_link_hash_traverse (elf_hash_table (info),
elf_gc_propagate_vtable_entries_used,
/* Allow the backend to mark additional target specific sections. */
if (bed->gc_mark_extra_sections)
- bed->gc_mark_extra_sections(info, gc_mark_hook);
-
- /* ... again for sections marked from eh_frame. */
- for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
- {
- asection *o;
-
- if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
- continue;
-
- /* Keep .gcc_except_table.* if the associated .text.* (or the
- associated .gnu.linkonce.t.* if .text.* doesn't exist) is
- marked. This isn't very nice, but the proper solution,
- splitting .eh_frame up and using comdat doesn't pan out
- easily due to needing special relocs to handle the
- difference of two symbols in separate sections.
- Don't keep code sections referenced by .eh_frame. */
-#define TEXT_PREFIX ".text."
-#define TEXT_PREFIX2 ".gnu.linkonce.t."
-#define GCC_EXCEPT_TABLE_PREFIX ".gcc_except_table."
- for (o = sub->sections; o != NULL; o = o->next)
- if (!o->gc_mark && o->gc_mark_from_eh && (o->flags & SEC_CODE) == 0)
- {
- if (CONST_STRNEQ (o->name, GCC_EXCEPT_TABLE_PREFIX))
- {
- char *fn_name;
- const char *sec_name;
- asection *fn_text;
- unsigned o_name_prefix_len , fn_name_prefix_len, tmp;
-
- o_name_prefix_len = strlen (GCC_EXCEPT_TABLE_PREFIX);
- sec_name = o->name + o_name_prefix_len;
- fn_name_prefix_len = strlen (TEXT_PREFIX);
- tmp = strlen (TEXT_PREFIX2);
- if (tmp > fn_name_prefix_len)
- fn_name_prefix_len = tmp;
- fn_name
- = bfd_malloc (fn_name_prefix_len + strlen (sec_name) + 1);
- if (fn_name == NULL)
- return FALSE;
-
- /* Try the first prefix. */
- sprintf (fn_name, "%s%s", TEXT_PREFIX, sec_name);
- fn_text = bfd_get_section_by_name (sub, fn_name);
-
- /* Try the second prefix. */
- if (fn_text == NULL)
- {
- sprintf (fn_name, "%s%s", TEXT_PREFIX2, sec_name);
- fn_text = bfd_get_section_by_name (sub, fn_name);
- }
-
- free (fn_name);
- if (fn_text == NULL || !fn_text->gc_mark)
- continue;
- }
-
- /* If not using specially named exception table section,
- then keep whatever we are using. */
- if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
- return FALSE;
- }
- }
+ bed->gc_mark_extra_sections (info, gc_mark_hook);
/* ... and mark SEC_EXCLUDE for those that go. */
return elf_gc_sweep (abfd, info);
projects / deliverable / binutils-gdb.git / blobdiff