anchor.diff:    (mezzano.lap.arm64:stp :x3 :x2 (:pre :sp -16))
     (mezzano.lap.arm64:stp :x7 :x4 (:pre :sp -16))
     (mezzano.lap.arm64:stp :x14 :x13 (:pre :sp -16))
  +  ;; Flush the pad slot.
  +  (mezzano.lap.arm64:str :xzr (:sp #x98))
     ;; Read & save SP_EL0
     (mezzano.lap.arm64:mrs :x9 :sp-el0)
     (mezzano.lap.arm64:str :x9 (:sp #x90))
  
positive.code:   (mezzano.lap.arm64:stp :x3 :x2 (:pre :sp -16))
    (mezzano.lap.arm64:stp :x7 :x4 (:pre :sp -16))
    (mezzano.lap.arm64:stp :x14 :x13 (:pre :sp -16))
    ;; Read & save SP.
    (mezzano.lap.arm64:add :x9 :sp 0)
    (mezzano.lap.arm64:str :x9 (:sp #x90))
  
negative.code:   (mezzano.lap.arm64:orr :x7 :xzr :x29)
    (mezzano.lap.arm64:movz :x5 #.(ash 1 sys.int::+n-fixnum-bits+)) ; 1 arg.
    ;; Build frame.
    (mezzano.lap.arm64:add :x29 :sp #x70)
    ;; Build interrupt frame object.
    (mezzano.lap.arm64:sub :sp :sp 16)
    (mezzano.lap.arm64:movz :x9 #.(ash sys.int::+object-tag-interrupt-frame+ sys.int::+object-type-shift+))
  