cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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R+fencembonceonces.litmus (499B)

      1C R+fencembonceonces
      2
      3(*
      4 * Result: Never
      5 *
      6 * This is the fully ordered (via smp_mb()) version of one of the classic
      7 * counterintuitive litmus tests that illustrates the effects of store
      8 * propagation delays.  Note that weakening either of the barriers would
      9 * cause the resulting test to be allowed.
     10 *)
     11
     12{}
     13
     14P0(int *x, int *y)
     15{
     16	WRITE_ONCE(*x, 1);
     17	smp_mb();
     18	WRITE_ONCE(*y, 1);
     19}
     20
     21P1(int *x, int *y)
     22{
     23	int r0;
     24
     25	WRITE_ONCE(*y, 2);
     26	smp_mb();
     27	r0 = READ_ONCE(*x);
     28}
     29
     30exists (y=2 /\ 1:r0=0)