2 mai 2018 10:47 "Dario Casalinuovo" <b.vitruvio@xxxxxxxxx> a écrit:
Hi,
One question is if there will be issues with 32 bit pointers. Long mode
seems to support PAE, so
Adrien suggested this isn't a problem?
There will be some work needed, still. IOW, there may be problems, but only
solvable ones.
If I understand this correctly, 32bit apps don't run in long mode, and we
swithc between long and
normal mode as needed (on syscalls, and on interrupts?). But I'm not very
familiar with how this
works.
AFAIK, there are two general modes which consists of various sub modes to
handle the different
stages, the legacy mode where you run a legacy 32 bit operating system (and
other compats which I'm
not going to state here), and the long mode which consists of two sub-modes,
the true 64 bit one
and the compat mode which is meant to run 32 bit code on a 64 bit OS.
I
Doesn't we need also to wrap fork() and similar functions? It seems under
linux they do it, while
didn't investigate why.
fork() is a syscall.
Sure, but for most syscalls I think it's enough to translate the calling
convention, so basically
the registers used from 32 bit to 64 bit.
