Execute-only status report

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Theo de Raadt (deraadt@) posted
to tech@ a
status report
(and 2
test programs)
regarding execute-only (xonly).
The report begins:

We've made good progress in the xonly effort so here's a small summary.

architectures crossed over completely

	arm64 - X bit without implied R in mmu
	riscv64  - X bit without implied R in mmu
	amd64 - using hardware 'PKU' feature
	powerpc64 - using feature similar to PKU
	hppa - using gateway feature

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