Linker part of PR16563 fix
Presents .eh_frame input sections to the optimisation machinery in
elf-eh-frame.c in the order they are given by the linker script.
PR 16563
bfd/
* elflink.c (bfd_elf_discard_info): Process .eh_frame and .stab
in the order they are mapped to output sections.
ld/
* ldlang.c (map_head_is_link_order): Rename from
stripped_excluded_sections.
(lang_clear_os_map): New function, extracted from..
(strip_excluded_output_sections): ..here.
* ldlang.h (lang_clear_os_map): Declare.
* ldwrite.c (ldwrite): Call lang_clear_os_map.
* emultempl/sh64elf.em (sh64_elf_${EMULATION_NAME}_after_allocation):
Likewise.
This commit is contained in:
Alan Modra
parent
b879806f2f
commit
18cd5bce47
@ -1,3 +1,9 @@
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2014-08-14 Alan Modra <amodra@gmail.com>
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PR 16563
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* elflink.c (bfd_elf_discard_info): Process .eh_frame and .stab
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in the order they are mapped to output sections.
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2014-08-14 Alan Modra <amodra@gmail.com>
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* configure.ac: Delete redundant plugin related checks.
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115
bfd/elflink.c
115
bfd/elflink.c
@ -12637,8 +12637,7 @@ bfd_boolean
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bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
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{
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struct elf_reloc_cookie cookie;
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asection *stab, *eh;
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const struct elf_backend_data *bed;
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asection *o;
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bfd *abfd;
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bfd_boolean ret = FALSE;
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@ -12646,70 +12645,86 @@ bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
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|| !is_elf_hash_table (info->hash))
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return FALSE;
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o = bfd_get_section_by_name (output_bfd, ".stab");
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if (o != NULL)
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{
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asection *i;
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for (i = o->map_head.s; i != NULL; i = i->map_head.s)
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{
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if (i->size == 0
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|| i->reloc_count == 0
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|| i->sec_info_type != SEC_INFO_TYPE_STABS)
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continue;
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abfd = i->owner;
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if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
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continue;
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if (!init_reloc_cookie_for_section (&cookie, info, i))
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return FALSE;
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if (_bfd_discard_section_stabs (abfd, i,
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elf_section_data (i)->sec_info,
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bfd_elf_reloc_symbol_deleted_p,
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&cookie))
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ret = TRUE;
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fini_reloc_cookie_for_section (&cookie, i);
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}
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}
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o = NULL;
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if (!info->relocatable)
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o = bfd_get_section_by_name (output_bfd, ".eh_frame");
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if (o != NULL)
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{
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asection *i;
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_bfd_elf_begin_eh_frame_parsing (info);
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for (i = o->map_head.s; i != NULL; i = i->map_head.s)
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{
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if (i->size == 0)
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continue;
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abfd = i->owner;
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if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
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continue;
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if (!init_reloc_cookie_for_section (&cookie, info, i))
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return FALSE;
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_bfd_elf_parse_eh_frame (abfd, info, i, &cookie);
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if (_bfd_elf_discard_section_eh_frame (abfd, info, i,
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bfd_elf_reloc_symbol_deleted_p,
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&cookie))
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ret = TRUE;
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fini_reloc_cookie_for_section (&cookie, i);
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}
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_bfd_elf_end_eh_frame_parsing (info);
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}
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for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next)
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{
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const struct elf_backend_data *bed;
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if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
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continue;
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bed = get_elf_backend_data (abfd);
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eh = NULL;
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if (!info->relocatable)
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if (bed->elf_backend_discard_info != NULL)
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{
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eh = bfd_get_section_by_name (abfd, ".eh_frame");
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while (eh != NULL
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&& (eh->size == 0
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|| bfd_is_abs_section (eh->output_section)))
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eh = bfd_get_next_section_by_name (eh);
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}
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stab = bfd_get_section_by_name (abfd, ".stab");
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if (stab != NULL
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&& (stab->size == 0
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|| bfd_is_abs_section (stab->output_section)
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|| stab->sec_info_type != SEC_INFO_TYPE_STABS))
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stab = NULL;
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if (stab == NULL
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&& eh == NULL
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&& bed->elf_backend_discard_info == NULL)
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continue;
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if (!init_reloc_cookie (&cookie, info, abfd))
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return FALSE;
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if (stab != NULL
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&& stab->reloc_count > 0
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&& init_reloc_cookie_rels (&cookie, info, abfd, stab))
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{
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if (_bfd_discard_section_stabs (abfd, stab,
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elf_section_data (stab)->sec_info,
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bfd_elf_reloc_symbol_deleted_p,
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&cookie))
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ret = TRUE;
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fini_reloc_cookie_rels (&cookie, stab);
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}
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while (eh != NULL
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&& init_reloc_cookie_rels (&cookie, info, abfd, eh))
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{
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_bfd_elf_parse_eh_frame (abfd, info, eh, &cookie);
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if (_bfd_elf_discard_section_eh_frame (abfd, info, eh,
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bfd_elf_reloc_symbol_deleted_p,
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&cookie))
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ret = TRUE;
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fini_reloc_cookie_rels (&cookie, eh);
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eh = bfd_get_next_section_by_name (eh);
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}
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if (bed->elf_backend_discard_info != NULL
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&& (*bed->elf_backend_discard_info) (abfd, &cookie, info))
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if ((*bed->elf_backend_discard_info) (abfd, &cookie, info))
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ret = TRUE;
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fini_reloc_cookie (&cookie, abfd);
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}
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_bfd_elf_end_eh_frame_parsing (info);
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}
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if (info->eh_frame_hdr
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&& !info->relocatable
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12
ld/ChangeLog
12
ld/ChangeLog
@ -1,3 +1,15 @@
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2014-08-14 Alan Modra <amodra@gmail.com>
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PR 16563
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* ldlang.c (map_head_is_link_order): Rename from
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stripped_excluded_sections.
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(lang_clear_os_map): New function, extracted from..
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(strip_excluded_output_sections): ..here.
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* ldlang.h (lang_clear_os_map): Declare.
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* ldwrite.c (ldwrite): Call lang_clear_os_map.
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* emultempl/sh64elf.em (sh64_elf_${EMULATION_NAME}_after_allocation):
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Likewise.
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2014-08-14 Alan Modra <amodra@gmail.com>
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* configure.ac: Move AC_PROG_CC and other macros earlier. Delete
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@ -248,6 +248,9 @@ sh64_elf_${EMULATION_NAME}_after_allocation (void)
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gld${EMULATION_NAME}_after_allocation ();
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/* Needed, since we create link_orders here. */
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lang_clear_os_map ();
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cranges = bfd_get_section_by_name (link_info.output_bfd,
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SH64_CRANGES_SECTION_NAME);
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42
ld/ldlang.c
42
ld/ldlang.c
@ -57,7 +57,7 @@ static struct obstack map_obstack;
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#define obstack_chunk_free free
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static const char *entry_symbol_default = "start";
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static bfd_boolean placed_commons = FALSE;
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static bfd_boolean stripped_excluded_sections = FALSE;
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static bfd_boolean map_head_is_link_order = FALSE;
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static lang_output_section_statement_type *default_common_section;
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static bfd_boolean map_option_f;
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static bfd_vma print_dot;
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@ -2412,7 +2412,7 @@ lang_add_section (lang_statement_list_type *ptr,
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section->output_section = output->bfd_section;
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if (!link_info.relocatable
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&& !stripped_excluded_sections)
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&& !map_head_is_link_order)
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{
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asection *s = output->bfd_section->map_tail.s;
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output->bfd_section->map_tail.s = section;
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@ -3912,10 +3912,6 @@ strip_excluded_output_sections (void)
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}
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}
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/* TODO: Don't just junk map_head.s, turn them into link_orders. */
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output_section->map_head.link_order = NULL;
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output_section->map_tail.link_order = NULL;
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if (exclude)
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{
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/* We don't set bfd_section to NULL since bfd_section of the
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@ -3927,10 +3923,42 @@ strip_excluded_output_sections (void)
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link_info.output_bfd->section_count--;
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}
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}
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}
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/* Called from ldwrite to clear out asection.map_head and
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asection.map_tail for use as link_orders in ldwrite.
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FIXME: Except for sh64elf.em which starts creating link_orders in
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its after_allocation routine so needs to call it early. */
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void
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lang_clear_os_map (void)
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{
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lang_output_section_statement_type *os;
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if (map_head_is_link_order)
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return;
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for (os = &lang_output_section_statement.head->output_section_statement;
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os != NULL;
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os = os->next)
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{
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asection *output_section;
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if (os->constraint < 0)
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continue;
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output_section = os->bfd_section;
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if (output_section == NULL)
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continue;
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/* TODO: Don't just junk map_head.s, turn them into link_orders. */
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output_section->map_head.link_order = NULL;
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output_section->map_tail.link_order = NULL;
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}
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/* Stop future calls to lang_add_section from messing with map_head
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and map_tail link_order fields. */
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stripped_excluded_sections = TRUE;
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map_head_is_link_order = TRUE;
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}
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static void
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@ -636,6 +636,8 @@ extern void *stat_alloc
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(size_t);
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extern void strip_excluded_output_sections
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(void);
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extern void lang_clear_os_map
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(void);
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extern void dprint_statement
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(lang_statement_union_type *, int);
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extern void lang_size_sections
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@ -572,6 +572,7 @@ ldwrite (void)
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/* Reset error indicator, which can typically something like invalid
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format from opening up the .o files. */
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bfd_set_error (bfd_error_no_error);
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lang_clear_os_map ();
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lang_for_each_statement (build_link_order);
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if (config.split_by_reloc != (unsigned) -1
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