Linus Torvalds wrote:
> The thing is, gettimeofday() isn't _that_ special. It's just not worth a
> vsyscall of it's own, I feel. Where do you stop? Do we do getpid() too?
This is why I'd say mkae no distinction at all. Have the first
nr_syscalls * 8 bytes starting at 0xfffff000 as a jump table. We can
transfer to a different slot for each syscall. Each slot then could be
a PC-relative jump to the common sysenter code or to some special code
sequence which is also in the global page.
If we don't do this now and it seems desirable in future we wither have
to introduce a second ABI for the vsyscall stuff (ugly!) or you'll have
to do the demultiplexing yourself in the code starting at 0xfffff000.
-- --------------. ,-. 444 Castro Street Ulrich Drepper \ ,-----------------' \ Mountain View, CA 94041 USA Red Hat `--' drepper at redhat.com `---------------------------- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Mon Dec 23 2002 - 22:00:17 EST