12.11.2012 07:04, Bart Oldeman пишет: > Sorry, but PROT_WRITE implies PROT_READ on x86, so that cannot work. OK, but there might still be the workaround. How about this: 1. Write-protect video mem 2. On PF save CR2, remove protection, set TF and return 3. On SIGTRAP use saved CR2 to perform the write handling. 4. Clear TF and goto 1 I guess its going to be horribly slow on "rep movsb"... So the trivial implementation seems still possible, but the performance would be far from perfection, for sure.
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