GCSSS2 Guarded Control Stack Switch Stack 2 Guarded Control Stack Switch Stack 2 validates that the most recent entry of the Guarded control stack being switched to contains an In-progress cap entry, stores a Valid cap entry to the Guarded control stack that is being switched from, and sets Xt to the Guarded control stack pointer that is being switched from. SYSL 1 1 0 1 0 1 0 1 0 0 1 0 1 0 1 1 0 1 1 1 0 1 1 1 0 1 1 GCSSS2 <Xt> SYSL <Xt>, #3, C7, C7, #3 Unconditionally <Xt> Is the 64-bit name of the general-purpose destination register, encoded in the "Rt" field.