basically

memory protection is the fact that on the DS, when trying to access a protected memory region (for example, trying to read from NULL), you get an exception (data abort, or prefetch abort for code).

this means squat for normal, well-functioning games.

however:

it means certain types of game crashes (glitches etc) may be emulated correctly.

it means crashes in homebrews would trigger the libnds exception handler, which would help homebrew devs.


melonDS already has most of the required PU emulation in place. emulating memory protection is simply matter of adding the check at the right places.

the check has a small performance hit (hardly noticeable here).

adding a 'perform PU checks' variable would have a similar performance hit.

using separate function pointers would allow disabling it with no performance cost, but would make the code less elegant.


so, what do you think?

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Kuribo64