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SubjectRe: Mach-O binary format support and Darwin syscall personality [Was: uts banner changes]
On Dec 12, 2006, at 13:20:19, Linus Torvalds wrote:
> That said, powerpc simply doesn't historically do any system call
> translation, so you'll just have to implement the same kind of
> translation layer that sparc has done, for example.

Thanks a lot for all your help. I've got two last questions: From
the code in entry_32.s I can dig up "current" from ((struct
paca_struct *)r13)->__current to read a personality flag from it,
right? Digging up offsets in assembly can't be very fun :-\
Secondly, is there a preferred existing field into which I should
stick said flag or just stuff it somewhere?

This part seems like the easiest so far; no icky binary format
parsing, no confusing memory maps. Thanks once again!

>> So I guess all I have to do is:
>> (A) Write a bunch of new syscall handlers taking arguments of
>> the same types
>> as the Darwin syscall handlers,
> Yes. The big issue tends to be to translate all the errno's and the
> fcntl structure pointers etc. THAT can be quite painful indeed. You
> might ask David Miller and company about their SunOS stuff, and
> look at things like
> arch/sparc/kernel/{sys_sunos.c,sunos_ioctl.c}
> for some sorry examples.

Ok, I figured it was going to be ugly; maybe not quite _that_ ugly
but my hopes weren't high enough for you to dash to any real degree :-D.

Kyle Moffett

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