As usual, no-execute bits in the page table is something that trickles down. I think in x86 land AMD introduced it with AMD64. The RISCies (Sparc, Power, Alpha,

As usual, no-execute bits in the page table is something that trickles down. I think in x86 land AMD introduced it with AMD64. The RISCies (Sparc, Power, Alpha, hppa) had this earlier.