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| author | H.J. Lu <hjl.tools@gmail.com> | 2018-07-17 16:11:13 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2018-07-17 16:11:44 -0700 |
| commit | be9ccd27c09ee76c5397125bfa0fefae318a2996 (patch) | |
| tree | fedd9f2980ad4b1d2afd66a83032dc317d253bd3 /ChangeLog | |
| parent | 5efc6777ad57c2055b618e0b8b8dc1e5bc4ab29a (diff) | |
| download | glibc-be9ccd27c09ee76c5397125bfa0fefae318a2996.tar.gz | |
i386: Add _CET_ENDBR to indirect jump targets in add_n.S/sub_n.S
i386 add_n.S and sub_n.S use a trick to implment jump tables with LEA.
We can't use conditional branches nor normal jump tables since jump
table entries use EFLAGS set by jump table index. This patch adds
_CET_ENDBR to indirect jump targets and adjust destination for
_CET_ENDBR.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* sysdeps/i386/add_n.S: Include <sysdep.h>, instead of
"sysdep.h".
(__mpn_add_n): Save and restore %ebx if IBT is enabed. Add
_CET_ENDBR to indirect jump targets and adjust jump destination
for _CET_ENDBR.
* sysdeps/i386/i686/add_n.S: Include <sysdep.h>, instead of
"sysdep.h".
(__mpn_add_n): Save and restore %ebx if IBT is enabed. Add
_CET_ENDBR to indirect jump targets and adjust jump destination
for _CET_ENDBR.
* sysdeps/i386/sub_n.S: Include <sysdep.h>, instead of
"sysdep.h".
(__mpn_sub_n): Save and restore %ebx if IBT is enabed. Add
_CET_ENDBR to indirect jump targets and adjust jump destination
for _CET_ENDBR.
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 18 |
1 files changed, 18 insertions, 0 deletions
@@ -1,5 +1,23 @@ 2018-07-17 H.J. Lu <hongjiu.lu@intel.com> + * sysdeps/i386/add_n.S: Include <sysdep.h>, instead of + "sysdep.h". + (__mpn_add_n): Save and restore %ebx if IBT is enabed. Add + _CET_ENDBR to indirect jump targets and adjust jump destination + for _CET_ENDBR. + * sysdeps/i386/i686/add_n.S: Include <sysdep.h>, instead of + "sysdep.h". + (__mpn_add_n): Save and restore %ebx if IBT is enabed. Add + _CET_ENDBR to indirect jump targets and adjust jump destination + for _CET_ENDBR. + * sysdeps/i386/sub_n.S: Include <sysdep.h>, instead of + "sysdep.h". + (__mpn_sub_n): Save and restore %ebx if IBT is enabed. Add + _CET_ENDBR to indirect jump targets and adjust jump destination + for _CET_ENDBR. + +2018-07-17 H.J. Lu <hongjiu.lu@intel.com> + * sysdeps/x86_64/multiarch/strcmp-sse42.S (STRCMP_SSE42): Add _CET_ENDBR. |