On Thursday 28 April 2005 22:48, Jeff Dike wrote:
> On Thu, Apr 28, 2005 at 11:10:53AM -0700, Chris Wright wrote:
> > * [email protected] ([email protected]) wrote:
> > > Split the i386 entry.S files into entry.S and syscall_table.S which
> > > is included in the previous one (so actually there is no difference
> > > between them) and use the syscall_table.S in the UML build, instead of
> > > tracking by hand the syscall table changes (which is inherently
> > > error-prone).
> >
> > Xen can use this as well (it was on my todo list).
>
> Maybe talking out of my ass here, but would it make sense to have the
> generic syscalls in asm-generic, in the form of something like:
> SYSCALL(__NR_getpid, sys_getpid)
> ?
>
> The arch include this into its syscall table, would continue to define
> __NR_*, and it would define SYSCALL (but all the syscall tables I've
> seen are just arrays of pointers). This would allow the arches to
> automatically get all the generic system calls, and they'd continue to
> define on their own any arch-specific things.
The problem is that probably there are little "generic" syscalls. The above
example is invalid on Alpha, for instance (they have sys_getxpid).
Also, probably, restructuring anything to take advantage of this would be very
dangerous, error-prone and not rewarding... we (UML) had to do this because
we had serious maintenance problems, plus the fact that we must *match* other
syscall tables rather than having our own. Otherwise there's probably no
reason to rebuild the table.
However, I guess that *new* syscalls are probably often generic, so for them
there would be a good reason to have some generic idea. Who knows...
--
Paolo Giarrusso, aka Blaisorblade
Skype user "PaoloGiarrusso"
Linux registered user n. 292729
http://www.user-mode-linux.org/~blaisorblade
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