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ELF: Properly group and place orphan note sections

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Properly group orphan note sections.  When placing orphan note section
as the first note section, place it after the section before all note
sections.

	PR ld/23658
	* ldlang.c (lang_insert_orphan): Properly group and place orphan
	note sections.  Properly handle orphan note section before all
	note sections.
	* testsuite/ld-elf/pr23658-1.d: Renamed to ...
	* testsuite/ld-elf/pr23658-1a.d: This.  Updated.
	* testsuite/ld-elf/pr23658-1b.d: New test.
	* testsuite/ld-elf/pr23658-1c.d: Likewise.
This commit is contained in:
H.J. Lu 2018-10-08 04:39:09 -07:00
parent 64029e9368
commit f3e660db14
5 changed files with 140 additions and 56 deletions
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11
ld/ChangeLog
View File

@ -1,3 +1,14 @@
2018-10-08 H.J. Lu <hongjiu.lu@intel.com>
PR ld/23658
* ldlang.c (lang_insert_orphan): Properly group and place orphan
note sections. Properly handle orphan note section before all
note sections.
* testsuite/ld-elf/pr23658-1.d: Renamed to ...
* testsuite/ld-elf/pr23658-1a.d: This. Updated.
* testsuite/ld-elf/pr23658-1b.d: New test.
* testsuite/ld-elf/pr23658-1c.d: Likewise.
2018-10-08 Alan Modra <amodra@gmail.com>
* ldexp.c (fold_name <SIZEOF_HEADERS>): Set link_info.load_phdrs.

150
ld/ldlang.c
View File

@ -1879,6 +1879,7 @@ lang_insert_orphan (asection *s,
{
asection *snew, *as;
bfd_boolean place_after = place->stmt == NULL;
bfd_boolean insert_after = TRUE;
snew = os->bfd_section;
@ -1934,7 +1935,9 @@ lang_insert_orphan (asection *s,
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;
bfd_boolean after_sec_note = FALSE;
static asection *first_orphan_note = NULL;
/* Group and sort output note section by alignments in
ascending order. */
@ -1942,11 +1945,12 @@ lang_insert_orphan (asection *s,
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;
/* Search from the beginning for the last output note
section with equal or larger alignments. NB: Don't
place orphan note section after non-note sections. */
for (sec = as;
first_orphan_note = NULL;
for (sec = link_info.output_bfd->sections;
(sec != NULL
&& !bfd_is_abs_section (sec));
sec = sec->next)
@ -1954,52 +1958,34 @@ lang_insert_orphan (asection *s,
&& elf_section_type (sec) == SHT_NOTE
&& (sec->flags & SEC_LOAD) != 0)
{
if (!first_note)
first_note = sec;
if (!first_orphan_note)
first_orphan_note = sec;
if (sec->alignment_power >= s->alignment_power)
after_sec = sec;
}
else if (first_orphan_note)
{
/* Stop if there is non-note section after the first
orphan note section. */
break;
}
if (after_sec)
after_sec_note = TRUE;
else
/* If this will be the first orphan note section, it can
be placed at the default location. */
after_sec_note = first_orphan_note != NULL;
if (after_sec == NULL && after_sec_note)
{
/* 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;
}
/* If all output note sections have smaller
alignments, place the section before all
output orphan note sections. */
after_sec = first_orphan_note;
insert_after = FALSE;
}
}
else
else if (first_orphan_note)
{
/* Don't place non-note sections in the middle of note
sections. */
/* Don't place non-note sections in the middle of orphan
note sections. */
after_sec_note = TRUE;
after_sec = as;
for (sec = as->next;
@ -2015,20 +2001,68 @@ lang_insert_orphan (asection *s,
{
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)
/* Search forward to insert OS after AFTER_SEC output
statement. */
lang_output_section_statement_type *stmt, *next;
bfd_boolean found = FALSE;
for (stmt = after; stmt != NULL; stmt = next)
{
next = stmt->next;
if (insert_after)
{
if (stmt->bfd_section == after_sec)
{
place_after = TRUE;
found = TRUE;
after = stmt;
break;
}
}
else
{
/* If INSERT_AFTER is FALSE, place OS before
AFTER_SEC output statement. */
if (next && next->bfd_section == after_sec)
{
place_after = TRUE;
found = TRUE;
after = stmt;
break;
}
}
}
/* Search backward to insert OS after AFTER_SEC output
statement. */
if (!found)
for (stmt = after; stmt != NULL; stmt = stmt->prev)
{
place_after = TRUE;
after = stmt;
break;
if (insert_after)
{
if (stmt->bfd_section == after_sec)
{
place_after = TRUE;
after = stmt;
break;
}
}
else
{
/* If INSERT_AFTER is FALSE, place OS before
AFTER_SEC output statement. */
if (stmt->next->bfd_section == after_sec)
{
place_after = TRUE;
after = stmt;
break;
}
}
}
}
if (after_sec == NULL || after_sec->next != snew)
if (after_sec == NULL
|| (insert_after && after_sec->next != snew)
|| (!insert_after && after_sec->prev != snew))
{
/* Unlink the section. */
bfd_section_list_remove (link_info.output_bfd, snew);
@ -2036,8 +2070,14 @@ lang_insert_orphan (asection *s,
/* 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);
{
if (insert_after)
bfd_section_list_insert_after (link_info.output_bfd,
after_sec, snew);
else
bfd_section_list_insert_before (link_info.output_bfd,
after_sec, snew);
}
else
bfd_section_list_prepend (link_info.output_bfd, snew);
}

6
ld/testsuite/ld-elf/pr23658-1.d → ld/testsuite/ld-elf/pr23658-1a.d
View File

@ -7,8 +7,12 @@
#readelf: -l --wide
# Since generic linker targets don't place SHT_NOTE sections as orphan,
# SHT_NOTE sections aren't grouped nor sorted.
#xfail: cr16-* crx-* d30v-* dlx-* fr30-* frv-* ft32-* iq2000-*
#xfail: d30v-* dlx-* fr30-* frv-*-elf ft32-* iq2000-*
#xfail: m68hc12-* mn10200-* moxie-* mt-* msp430-* pj-* xgate-*
# The following targets don't support --build-id.
#xfail: cr16-* crx-* visium-* xc16x-*
# The following targets place .note.gnu.build-id in unusual places.
#xfail: pru-*
#...
+[0-9]+ +\.note\.4 \.note\.1 +

16
ld/testsuite/ld-elf/pr23658-1b.d Normal file
View File

@ -0,0 +1,16 @@
#source: pr23658-1a.s
#source: pr23658-1b.s
#source: pr23658-1c.s
#source: pr23658-1d.s
#source: start.s
#ld:
#readelf: -l --wide
# Since generic linker targets don't place SHT_NOTE sections as orphan,
# SHT_NOTE sections aren't grouped nor sorted.
#xfail: d30v-* dlx-* fr30-* frv-*-elf ft32-* iq2000-*
#xfail: mn10200-* moxie-* mt-* msp430-* pj-* xgate-*
#...
+[0-9]+ +\.note\.4 \.note\.1( .note.gnu.property|) +
+[0-9]+ +\.note\.2 .note\.3( .note.gnu.property|) +
#pass

13
ld/testsuite/ld-elf/pr23658-1c.d Normal file
View File

@ -0,0 +1,13 @@
#source: pr23658-1a.s
#source: pr23658-1b.s
#source: pr23658-1c.s
#source: pr23658-1d.s
#source: start.s
#ld: --build-id -shared
#readelf: -l --wide
#target: *-*-linux* *-*-gnu* arm*-*-uclinuxfdpiceabi
#...
+[0-9]+ +\.note\.4 \.note\.1 +
+[0-9]+ +\.note.gnu.build-id \.note\.2 .note\.3 +
#pass