Anyone know a way to call a PPC local fn by its address via assembly?

I tried:

x& = @Fn test
`     lwz     r0,r0,^x&
`     mtspr   8,r0
`     blr

This actually arrived at FN Test when run, but then went haywire.  I must
be missing a step or two.

In 68k I use:

`	move.l   ^x&,a0
`	jsr	 a0


-D