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| author | H.J. Lu <hongjiu.lu@intel.com> | 2018-12-14 21:35:36 +0000 |
|---|---|---|
| committer | H.J. Lu <hjl@gcc.gnu.org> | 2018-12-14 13:35:36 -0800 |
| commit | 06553c89f521477d6c3ec4023d5162f90c57111d (patch) | |
| tree | c6d500a4d04a1fcee026fc1b5125e4a7a2b05a31 /gcc/tree-object-size.c | |
| parent | c759830b29fff2288bc0cebfb4b2c479f0b5b30e (diff) | |
| download | gcc-06553c89f521477d6c3ec4023d5162f90c57111d.zip gcc-06553c89f521477d6c3ec4023d5162f90c57111d.tar.gz gcc-06553c89f521477d6c3ec4023d5162f90c57111d.tar.bz2 | |
x86; Add -mmanual-endbr and cf_check function attribute
Currently GCC inserts ENDBR instruction at entries of all non-static
functions, unless LTO compilation is used. Marking all functions,
which are not called indirectly with nocf_check attribute, is not
ideal since 99% of functions in a program may be of this kind.
This patch adds -mmanual-endbr and cf_check function attribute. They
can be used together with -fcf-protection such that ENDBR instruction
is inserted only at entries of functions with cf_check attribute. It
can limit number of ENDBR instructions to reduce program size.
gcc/
* config/i386/i386.c (rest_of_insert_endbranch): Insert ENDBR
at the function entry only when -mmanual-endbr isn't used or
there is cf_check function attribute.
(ix86_attribute_table): Add cf_check.
* config/i386/i386.opt: Add -mmanual-endbr.
* doc/extend.texi: Document cf_check attribute.
* doc/invoke.texi: Document -mmanual-endbr.
gcc/testsuite/
* gcc.target/i386/cf_check-1.c: New test.
* gcc.target/i386/cf_check-2.c: Likewise.
* gcc.target/i386/cf_check-3.c: Likewise.
* gcc.target/i386/cf_check-4.c: Likewise.
* gcc.target/i386/cf_check-5.c: Likewise.
From-SVN: r267154
Diffstat (limited to 'gcc/tree-object-size.c')
0 files changed, 0 insertions, 0 deletions