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ELF: Group and sort output note sections by section alignments 

To support putting all adjacent SHT_NOTE sections with the same section
alignment into a single PT_NOTE segment, lang_insert_orphan must group
and sort output note sections by section alignments in both output
section list as well as output section statement list.

	PR ld/23658
	* ldlang.c (lang_insert_orphan): Group and sort output note
	sections by section alignments.
This commit is contained in:
H.J. Lu 2018-10-03 13:25:16 -07:00
parent 23e463ed7c
commit 1887ae7304
2 changed files with 145 additions and 1 deletions
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6
ld/ChangeLog
View File

@ -1,3 +1,9 @@
2018-10-03 H.J. Lu <hongjiu.lu@intel.com>
PR ld/23658
* ldlang.c (lang_insert_orphan): Group and sort output note
sections by section alignments.
2018-09-25 Eric Botcazou <ebotcazou@adacore.com>
* testsuite/ld-elf/pr14156b.d: Adjust for extra symbols.

140
ld/ldlang.c
View File

@ -1875,6 +1875,7 @@ lang_insert_orphan (asection *s,
if (after != NULL && os->bfd_section != NULL)
{
asection *snew, *as;
bfd_boolean place_after = place->stmt == NULL;
snew = os->bfd_section;
@ -1912,6 +1913,142 @@ lang_insert_orphan (asection *s,
/* Now tack it back on in the right place. */
bfd_section_list_append (link_info.output_bfd, snew);
}
else if ((bfd_get_flavour (link_info.output_bfd)
== bfd_target_elf_flavour)
&& (bfd_get_flavour (s->owner)
== bfd_target_elf_flavour)
&& ((elf_section_type (s) == SHT_NOTE
&& (s->flags & SEC_LOAD) != 0)
|| (elf_section_type (as) == SHT_NOTE
&& (as->flags & SEC_LOAD) != 0)))
{
/* Make sure that output note sections are grouped and sorted
by alignments when inserting a note section or insert a
section after a note section, */
asection *sec;
/* A specific section after which the output note section
should be placed. */
asection *after_sec;
/* True if we need to insert the orphan section after a
specific section to maintain output note section order. */
bfd_boolean after_sec_note;
/* Group and sort output note section by alignments in
ascending order. */
after_sec = NULL;
if (elf_section_type (s) == SHT_NOTE
&& (s->flags & SEC_LOAD) != 0)
{
/* Search forward for the last output note section
with equal or larger alignments. */
asection *first_note = NULL;
for (sec = as;
(sec != NULL
&& !bfd_is_abs_section (sec));
sec = sec->next)
if (sec != snew
&& elf_section_type (sec) == SHT_NOTE
&& (sec->flags & SEC_LOAD) != 0)
{
if (!first_note)
first_note = sec;
if (sec->alignment_power >= s->alignment_power)
after_sec = sec;
}
if (after_sec)
after_sec_note = TRUE;
else
{
/* Search backward for the first output note section
as well as the last output note section with equal
or larger alignments. */
after_sec = NULL;
for (sec = as;
(sec != NULL
&& !bfd_is_abs_section (sec));
sec = sec->prev)
if (sec != snew
&& elf_section_type (sec) == SHT_NOTE
&& (sec->flags & SEC_LOAD) != 0)
{
first_note = sec;
if (!after_sec
&& sec->alignment_power >= s->alignment_power)
after_sec = sec;
}
/* If this will be the first note section, it can be
placed at the default location. */
after_sec_note = first_note != NULL;
if (after_sec == NULL && after_sec_note)
{
/* If all output note sections have smaller
alignments, place the section before all
output note sections. AFTER_SEC will be
NULL if FIRST_NOTE is the first output
section. */
after_sec = first_note->prev;
}
}
}
else
{
/* Don't place non-note sections in the middle of note
sections. */
after_sec_note = TRUE;
after_sec = as;
for (sec = as->next;
(sec != NULL
&& !bfd_is_abs_section (sec));
sec = sec->next)
if (elf_section_type (sec) == SHT_NOTE
&& (sec->flags & SEC_LOAD) != 0)
after_sec = sec;
}
if (after_sec_note)
{
if (after_sec)
{
/* Insert OS after AFTER_SEC output statement. */
lang_output_section_statement_type *stmt;
for (stmt = after;
stmt != NULL;
stmt = stmt->next)
if (stmt->bfd_section == after_sec)
{
place_after = TRUE;
after = stmt;
break;
}
}
if (after_sec == NULL || after_sec->next != snew)
{
/* Unlink the section. */
bfd_section_list_remove (link_info.output_bfd, snew);
/* Place SNEW after AFTER_SEC. If AFTER_SEC is NULL,
prepend SNEW. */
if (after_sec)
bfd_section_list_insert_after (link_info.output_bfd,
after_sec, snew);
else
bfd_section_list_prepend (link_info.output_bfd, snew);
}
}
else if (as != snew && as->prev != snew)
{
/* Unlink the section. */
bfd_section_list_remove (link_info.output_bfd, snew);
/* Now tack it back on in the right place. */
bfd_section_list_insert_before (link_info.output_bfd,
as, snew);
}
}
else if (as != snew && as->prev != snew)
{
/* Unlink the section. */
@ -1938,7 +2075,8 @@ lang_insert_orphan (asection *s,
{
lang_output_section_statement_type *newly_added_os;
if (place->stmt == NULL)
/* Place OS after AFTER if AFTER_NOTE is TRUE. */
if (place_after)
{
lang_statement_union_type **where = insert_os_after (after);