On Tue, Dec 17, 2002 at 10:49:31AM -0800, Linus Torvalds wrote:
> There is only a "call relative" or "call indirect-absolute". So you either
> have to indirect through memory or a register, or you have to fix up the
> call at link-time.
>
> Yeah, I know it sounds strange, but it makes sense. Absolute calls are
> actually very unusual, and using relative calls is _usually_ the right
> thing to do. It's only in cases like this that we really want to call a
> specific address.
The stubs I used for the vsyscall bits just did an absolute jump to
the vsyscall page, which would then do a ret to the original calling
userspace code (since that provided library symbols for the user to
bind against).
-ben
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