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| author | H.J. Lu <hongjiu.lu@intel.com> | 2018-02-22 17:09:06 +0000 |
|---|---|---|
| committer | H.J. Lu <hjl@gcc.gnu.org> | 2018-02-22 09:09:06 -0800 |
| commit | 73b8b82295fb286c2d5b01c200fcd6732a96c2a8 (patch) | |
| tree | 74872a581bf4597a9147fbaf2d607e96f1bd5729 /libgfortran/runtime/stop.c | |
| parent | eae52f300e0f1c71ac69b83495bc9a170330e95b (diff) | |
| download | gcc-73b8b82295fb286c2d5b01c200fcd6732a96c2a8.zip gcc-73b8b82295fb286c2d5b01c200fcd6732a96c2a8.tar.gz gcc-73b8b82295fb286c2d5b01c200fcd6732a96c2a8.tar.bz2 | |
i386: Add __x86_indirect_thunk_nt_reg for -fcf-protection -mcet
nocf_check attribute can be used with -fcf-protection -mcet to disable
control-flow check by adding NOTRACK prefix before indirect branch.
When -mindirect-branch=thunk-extern -mindirect-branch-register is added,
indirect branch via register, "notrack call/jmp reg", is converted to
call/jmp __x86_indirect_thunk_nt_reg
When running on machines with CET enabled, __x86_indirect_thunk_nt_reg
can be updated to
notrack jmp reg
at run-time to restore NOTRACK prefix in the original indirect branch.
Since we don't support -mindirect-branch=thunk-extern, CET and MPX at
the same time, -mindirect-branch=thunk-extern is disallowed with
-fcf-protection=branch and -fcheck-pointer-bounds.
Tested on i686 and x86-64.
gcc/
PR target/84176
* config/i386/i386.c (ix86_set_indirect_branch_type): Issue an
error when -mindirect-branch=thunk-extern, -fcf-protection=branch
and -fcheck-pointer-bounds are used together.
(indirect_thunk_prefix): New enum.
(indirect_thunk_need_prefix): New function.
(indirect_thunk_name): Replace need_bnd_p with need_prefix. Use
"_nt" instead of "_bnd" for NOTRACK prefix.
(output_indirect_thunk): Replace need_bnd_p with need_prefix.
(output_indirect_thunk_function): Likewise.
(): Likewise.
(ix86_code_end): Update output_indirect_thunk_function calls.
(ix86_output_indirect_branch_via_reg): Replace
ix86_bnd_prefixed_insn_p with indirect_thunk_need_prefix.
(ix86_output_indirect_branch_via_push): Likewise.
(ix86_output_function_return): Likewise.
* doc/invoke.texi: Document -mindirect-branch=thunk-extern is
incompatible with -fcf-protection=branch and
-fcheck-pointer-bounds.
gcc/testsuite/
PR target/84176
* gcc.target/i386/indirect-thunk-11.c: New test.
* gcc.target/i386/indirect-thunk-12.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-12.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-13.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-14.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-15.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-16.c: Likewise.
* gcc.target/i386/indirect-thunk-extern-10.c: Likewise.
* gcc.target/i386/indirect-thunk-extern-8.c: Likewise.
* gcc.target/i386/indirect-thunk-extern-9.c: Likewise.
From-SVN: r257909
Diffstat (limited to 'libgfortran/runtime/stop.c')
0 files changed, 0 insertions, 0 deletions