================
@@ -1694,6 +1718,35 @@ let Predicates = [HasPAuth] in {
def BLRABZ : AuthOneOperand<0b001, 1, "blrabz">;
}
+ // BLRA pseudo, generalized version of BLRAA/BLRAB/Z.
+ // This directly manipulates x16/x17, which are the only registers the OS
+ // guarantees are safe to use for sensitive operations.
----------------
ahmedbougacha wrote:
Unfortunately this sort of thing isn't documented. We do describe the general
contract in the security model sections of the clang docs.
For ELF it might make sense to have a formalization in the PAuth ABI, but that
would have to be actually honored in an OS; I imagine it currently isn't
anywhere other than Darwin.
https://github.com/llvm/llvm-project/pull/85736
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