28 Sep
2004
28 Sep
'04
3:22 a.m.
ben franchuk wrote:
Peter C. Wallace wrote:
ISTR I saw it in two area's:
- delay loop calibration -> delay routine contains a number of nops,
jump instruction moves 'upward' depending on amount of delay required in
the loop.
- one program contained some jump instructions that were replaced by
nops (or vice-versa) when a dongle was detected.
Found by reverse engineering some DOS software.
Bert
Isn't self modifying code pretty much
deprecated these days (aside from
trampolines and such)
So what is a trampoline?
Peter Wallace
I have yet to see a good use for self-modifying code. Other than
subroutines and interupts placing data into a code segement the only
self modifying code I have seen was for the 8088.