diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2021-03-26 16:12:15 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2021-04-02 12:47:28 +0200 |
| commit | 9bc0bb50727c8ac69fbb33fb937431cf3518ff37 (patch) | |
| tree | 586a82e95847ae6c3f393728fb074b1d6df9ae71 /arch/x86/include/asm/intel-family.h | |
| parent | 50e7b4a1a1b264fc7df0698f2defb93cadf19a7b (diff) | |
objtool/x86: Rewrite retpoline thunk calls
When the compiler emits: "CALL __x86_indirect_thunk_\reg" for an
indirect call, have objtool rewrite it to:
ALTERNATIVE "call __x86_indirect_thunk_\reg",
"call *%reg", ALT_NOT(X86_FEATURE_RETPOLINE)
Additionally, in order to not emit endless identical
.altinst_replacement chunks, use a global symbol for them, see
__x86_indirect_alt_*.
This also avoids objtool from having to do code generation.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/20210326151300.320177914@infradead.org
Diffstat (limited to 'arch/x86/include/asm/intel-family.h')
0 files changed, 0 insertions, 0 deletions