Inductive valid_genv {F V:Type} (ge:Genv.t F V) (m:mem) : Type :=
mk_valid_genv :
(forall b, isGlobalBlock ge b=true -> val_valid (Vptr b Ptrofs.zero) m) ->
(forall b f, Genv.find_funct_ptr ge b = Some f -> val_valid (Vptr b Ptrofs.zero) m) ->
valid_genv ge m.

Lemma valid_genv_store_zeros: forall {F V:Type} (ge:Genv.t F V) m m1 b y z
(STORE_ZERO: store_zeros m b y z = Some m1)
(G: valid_genv ge m), valid_genv ge m1.