Fix Replace_memcpy crash

[sum2012]

Fix Replace_memcpy crash in #5496
if do not use Replace_memcpy,the game still have problem

[sum2012]

Does this fix better ?
sum2012@d669186

[hrydgard]

Nope.

[sum2012]

OK
edit:I asume it mean no

[unknownbrackets]

If we're going to do this we should probably at least log something, no? memcpy(0, src, size > 0) will definitely crash on a real PSP.

-[Unknown]

[hrydgard]

@sum2012 , yes, nope == no

@unknownbrackets , yeah. For consistency I guess if we should check one parameter we should check more - but I'm starting to change my mind about this one because the real memcpy doesn't check and it's "right" to crash - it would surely have crashed had we not replaced the function.

I suppose we should check if fastmem is off. Could even have separate functions for fastmem to avoid the check...

[sum2012]

If turn off fast memory,now the game is playable.
We still need to solve "ReadFromHardware: Invalid address "
log: https://gist.github.com/sum2012/46bfbab83575078cd3a9