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| author | John David Anglin <danglin@gcc.gnu.org> | 2019-10-20 12:01:58 -0400 |
|---|---|---|
| committer | John David Anglin <danglin@gcc.gnu.org> | 2019-10-20 12:01:58 -0400 |
| commit | 2c9e9550caf28bceb6b8540520f7378e1b1bb9c2 (patch) | |
| tree | 910c06603154c5eeda877d24092c4a5871b6e0bc /bfd | |
| parent | 80051c7439399c861b52af0546ad67367f7184e4 (diff) | |
| download | gdb-2c9e9550caf28bceb6b8540520f7378e1b1bb9c2.zip gdb-2c9e9550caf28bceb6b8540520f7378e1b1bb9c2.tar.gz gdb-2c9e9550caf28bceb6b8540520f7378e1b1bb9c2.tar.bz2 | |
[bfd] Provide 8-byte minimum alignment for .plt section
This change increases the default alignment for the .plt section
from 4 bytes to 8 bytes. When function descriptors are 8-byte
aligned, they can be updated atomically on 32-bit hppa. This
helps with ordering issues on SMP machines. It also ensures
that descriptors reside on the same cache line. This reduces
the probability of a double TLB miss in a call.
2019-10-20 John David Anglin <danglin@gcc.gnu.org>
* elf32-hppa.c (elf32_hppa_size_dynamic_sections): Provide 8-byte
minimum alignment for .plt section.
Diffstat (limited to 'bfd')
| -rw-r--r-- | bfd/ChangeLog | 5 | ||||
| -rw-r--r-- | bfd/elf32-hppa.c | 5 |
2 files changed, 8 insertions, 2 deletions
diff --git a/bfd/ChangeLog b/bfd/ChangeLog index 44790fb..429e423 100644 --- a/bfd/ChangeLog +++ b/bfd/ChangeLog @@ -1,3 +1,8 @@ +2019-10-20 John David Anglin <danglin@gcc.gnu.org> + + * elf32-hppa.c (elf32_hppa_size_dynamic_sections): Provide 8-byte + minimum alignment for .plt section. + 2019-10-19 John David Anglin <danglin@gcc.gnu.org> * elf32-hppa.c: Revise import stub sequences. diff --git a/bfd/elf32-hppa.c b/bfd/elf32-hppa.c index 8a19c19..35564dd 100644 --- a/bfd/elf32-hppa.c +++ b/bfd/elf32-hppa.c @@ -2280,10 +2280,11 @@ elf32_hppa_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, against the .got section. */ int gotalign = bfd_section_alignment (htab->etab.sgot); int pltalign = bfd_section_alignment (sec); + int align = gotalign > 3 ? gotalign : 3; bfd_size_type mask; - if (gotalign > pltalign) - bfd_set_section_alignment (sec, gotalign); + if (align > pltalign) + bfd_set_section_alignment (sec, align); mask = ((bfd_size_type) 1 << gotalign) - 1; sec->size = (sec->size + sizeof (plt_stub) + mask) & ~mask; } |