     3 vm-reg MR
     "begin_callback" jit-call
 
+    jit-load-context
     jit-restore-context
 
     ! Call quotation
+    3 nv-reg MR
     jit-call-quot
 
     jit-save-context

    2 vm-reg vm-context-offset STW

    ! Save C callstack pointer
    2 context-callstack-save-offset 1 STW

    ! Load Factor callstack pointer
    1 2 context-callstack-bottom-offset LWZ

    0 2 LOAD32 rc-absolute-ppc-2/2 rt-entry-point jit-rel
    2 MTLR
    BLRL

    ! Load VM again, pointlessly
    0 vm-reg LOAD32 rc-absolute-ppc-2/2 rt-vm jit-rel

    ! Load C callstack pointer
    2 vm-reg vm-context-offset LWZ
