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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WRC+pooncerelease+fencermbonceonce+Once.litmus (644B)

      1C WRC+pooncerelease+fencermbonceonce+Once
      2
      3(*
      4 * Result: Never
      5 *
      6 * This litmus test is an extension of the message-passing pattern, where
      7 * the first write is moved to a separate process.  Because it features
      8 * a release and a read memory barrier, it should be forbidden.  More
      9 * specifically, this litmus test is forbidden because smp_store_release()
     10 * is A-cumulative in LKMM.
     11 *)
     12
     13{}
     14
     15P0(int *x)
     16{
     17	WRITE_ONCE(*x, 1);
     18}
     19
     20P1(int *x, int *y)
     21{
     22	int r0;
     23
     24	r0 = READ_ONCE(*x);
     25	smp_store_release(y, 1);
     26}
     27
     28P2(int *x, int *y)
     29{
     30	int r0;
     31	int r1;
     32
     33	r0 = READ_ONCE(*y);
     34	smp_rmb();
     35	r1 = READ_ONCE(*x);
     36}
     37
     38exists (1:r0=1 /\ 2:r0=1 /\ 2:r1=0)