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| author | H.J. Lu <hjl.tools@gmail.com> | 2018-02-05 08:38:16 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2018-02-05 08:38:16 -0800 |
| commit | cd04836359da82ae1dc67e5a05565536f4427b51 (patch) | |
| tree | fc72f6593a58e26174caadbfe9515204901fb318 /bfd/elf64-x86-64.c | |
| parent | b8df6ca79e69678a07d3216b9b2b552fce27cda8 (diff) | |
| download | gdb-cd04836359da82ae1dc67e5a05565536f4427b51.zip gdb-cd04836359da82ae1dc67e5a05565536f4427b51.tar.gz gdb-cd04836359da82ae1dc67e5a05565536f4427b51.tar.bz2 | |
x86: Remove the unused _GLOBAL_OFFSET_TABLE_
Since _GLOBAL_OFFSET_TABLE_ may be referenced implicitly on x86,
checking ref_regular_nonweak leaves the unused _GLOBAL_OFFSET_TABLE_
in output. This patch checks explicit GOT references instead.
ld-i386/discarded1.s and ld-x86-64/discarded1.s are updated to avoid
linker optimization which removes GOT references.
bfd/
PR ld/22782
* elf32-i386.c (elf_i386_check_relocs): Set got_referenced if
_GLOBAL_OFFSET_TABLE_ is referenced or GOT is needed to resolve
undefined weak symbol to 0.
* elf64-x86-64.c (elf_x86_64_check_relocs): Set got_referenced
if _GLOBAL_OFFSET_TABLE_ is referenced.
* elfxx-x86.c (_bfd_x86_elf_size_dynamic_sections): Check
got_referenced instead of ref_regular_nonweak. Remove the
unused _GLOBAL_OFFSET_TABLE_ from symbol table.
* elfxx-x86.h (elf_x86_link_hash_table): Add got_referenced.
ld/
PR ld/22782
* testsuite/ld-i386/discarded1.s: Replace mov with div.
* testsuite/ld-x86-64/discarded1.s: Likewise.
* testsuite/ld-i386/i386.exp: Run pr22782.
* testsuite/ld-i386/load1-nacl.d: Updated for removing
_GLOBAL_OFFSET_TABLE_ from output.
* testsuite/ld-i386/load1.d: Likewise.
* testsuite/ld-x86-64/load1a-nacl.d: Likewise.
* testsuite/ld-x86-64/load1a.d: Likewise.
* testsuite/ld-x86-64/load1b-nacl.d: Likewise.
* testsuite/ld-x86-64/load1b.d: Likewise.
* testsuite/ld-i386/pr22782.d: New file.
* testsuite/ld-i386/pr22782.s: Likewise.
* testsuite/ld-x86-64/pr22782.s: Likewise.
* testsuite/ld-x86-64/pr22782a.d: Likewise.
* testsuite/ld-x86-64/pr22782b.d: Likewise.
* testsuite/ld-x86-64/x86-64.exp: Run pr22782a and pr22782b.
Diffstat (limited to 'bfd/elf64-x86-64.c')
| -rw-r--r-- | bfd/elf64-x86-64.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/bfd/elf64-x86-64.c b/bfd/elf64-x86-64.c index ba4f47b..aad9b85 100644 --- a/bfd/elf64-x86-64.c +++ b/bfd/elf64-x86-64.c @@ -1927,6 +1927,10 @@ elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info, rel, rel_end, h, r_symndx, FALSE)) goto error_return; + /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */ + if (h == htab->elf.hgot) + htab->got_referenced = TRUE; + eh = (struct elf_x86_link_hash_entry *) h; switch (r_type) { |