27 Nov
2017
27 Nov
'17
6:35 p.m.
On 2017-11-27 11:11, Noel Chiappa wrote:
Programs which emit these little 'custom code
fragments' (I prefer
that term, since they aren't really 'self-modifying code' - which I
define as 'a program which _changes_ _existing_ instructions) must
have some way of having a chunk of memory into which they can write,
but which can also be executed.
As the writable/executable bits are usually in the page table (on linear
paged architectures which currently dominate the field), I imagine the
answer is dual page mappings.
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