So there is an approach which can be taken for these big chunks, which
I came up with yesterday.
Put them into .openbsd.mutable section.
At program startup they will be RW, so Immediately mprotect)
PROT_EXEC|PROT_READ, and if you feel like it use mimmutable() also,
which they would have been if started a different way.
Make sure the object is page aligned, or you'll cut yourself.
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