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-rw-r--r--gcc-4.9/gcc/config/i386/i386-opts.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/config/i386/i386-opts.h b/gcc-4.9/gcc/config/i386/i386-opts.h
index 47a34db..f446207 100644
--- a/gcc-4.9/gcc/config/i386/i386-opts.h
+++ b/gcc-4.9/gcc/config/i386/i386-opts.h
@@ -93,4 +93,17 @@ enum stack_protector_guard {
SSP_GLOBAL /* global canary */
};
+/* This is used to mitigate variant #2 of the speculative execution
+ vulnerabilities on x86 processors identified by CVE-2017-5715, aka
+ Spectre. They convert indirect branches and function returns to
+ call and return thunks to avoid speculative execution via indirect
+ call, jmp and ret. */
+enum indirect_branch {
+ indirect_branch_unset = 0,
+ indirect_branch_keep,
+ indirect_branch_thunk,
+ indirect_branch_thunk_inline,
+ indirect_branch_thunk_extern
+};
+
#endif