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| author | H.J. Lu <hjl.tools@gmail.com> | 2021-10-27 07:48:54 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2021-11-17 13:35:31 -0800 |
| commit | 53a643f8568067d7700a9f2facc8ba39974973d3 (patch) | |
| tree | 964ff4b7dbbab01a9b2e2f006c5a46c4e550c508 /libcpp | |
| parent | 8e410de43ce039bbe08f1e0195e3b6ec24f68cae (diff) | |
| download | gcc-53a643f8568067d7700a9f2facc8ba39974973d3.zip gcc-53a643f8568067d7700a9f2facc8ba39974973d3.tar.gz gcc-53a643f8568067d7700a9f2facc8ba39974973d3.tar.bz2 | |
x86: Add -mharden-sls=[none|all|return|indirect-branch]
Add -mharden-sls= to mitigate against straight line speculation (SLS)
for function return and indirect branch by adding an INT3 instruction
after function return and indirect branch.
gcc/
PR target/102952
* config/i386/i386-opts.h (harden_sls): New enum.
* config/i386/i386.c (output_indirect_thunk): Mitigate against
SLS for function return.
(ix86_output_function_return): Likewise.
(ix86_output_jmp_thunk_or_indirect): Mitigate against indirect
branch.
(ix86_output_indirect_jmp): Likewise.
(ix86_output_call_insn): Likewise.
* config/i386/i386.opt: Add -mharden-sls=.
* doc/invoke.texi: Document -mharden-sls=.
gcc/testsuite/
PR target/102952
* gcc.target/i386/harden-sls-1.c: New test.
* gcc.target/i386/harden-sls-2.c: Likewise.
* gcc.target/i386/harden-sls-3.c: Likewise.
* gcc.target/i386/harden-sls-4.c: Likewise.
* gcc.target/i386/harden-sls-5.c: Likewise.
Diffstat (limited to 'libcpp')
0 files changed, 0 insertions, 0 deletions