Re: [patch] fastcall-2.3.32-B6, SYSENTER/SYSEXIT support
Richard Gooch (rgooch@ras.ucalgary.ca)
Sun, 12 Dec 1999 12:16:39 -0700
Ulrich Drepper writes:
> Richard Gooch <rgooch@ras.ucalgary.ca> writes:
>
> > > > I propose a much simpler abstraction: set up a global page (which
> > > > always appears at a fixed address in user-space), and set up a jump
> > > > table. Have one jump vector per system call. That's the ABI. End of
> > > > story.
> > >
> > > I really like that.
> >
> > Thanks.
>
> This introduces major problems. What about libraries/programs which
> make syscalls which are not available on the system? The libc
> relies on unimplemented syscalls return ENOSYS.
Populate the jump table with trailing entries which return ENOSYS.
Alternatively, the kernel writes the number of syscalls at the end of
the global page. The libc syscall interface then checks this value
against the syscall number.
Regards,
Richard....
Permanent: rgooch@atnf.csiro.au
Current: rgooch@ras.ucalgary.ca
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/