Re: Jumping into middle of instruction


Bob Masta wrote:

How does Real Mode make a difference here?
You can't direct write to CodeSeg in protected mode.

That may be true in some sense, but not as a practical
matter... it is easy to create apps with combined code+data
that allow you to write anywhere in your own program space.
I use a .data? (BSS) section for uninitialized data and a
..code section for everything else. The linker needs to have
/SECTION:.text,ERW to handle this properly.

Yes, in the 'flat-OS' world code and data will match anyway,
I just mentioned it because of the CS-override in my example.

Self-modifying code seems to have a bad name, but it
shouldn't. Think about how you would do self-decryption
without it!

Sure, SMC got its place for many things and it can be used to create
extremely short routines even if they are very complex,
but I wont recommend to use it on active running code whenever speed
is of concern, too many penalties (cache invalidates/TLB-flushes/..)
are to expect here.

__
wolfgang


.

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