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On Tue, Dec 17, 2002 at 12:06:29PM -0800, Ulrich Drepper wrote: > 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. But what does this do to things like PTRACE_SYSCALL? And do we care... I suppose not if we keep the syscall trace checks on every kernel entry path. -- Daniel Jacobowitz MontaVista Software Debian GNU/Linux Developer - 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/ | ||||||||||||
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