xc16x.cpu insn issues

[Doug Evans]

Hi.

After adding (nop) to the "nop" instruction, I found a few other 
instructions with missing semantics.
For now we could just make them all nops, and add FIXME's for srstm,etc.

I also found the "prior" insn with invalid semantics.

What should these insns be?

(define-pmacro (sysctrl name insn opc1 opc2 op1 op2 op3)
  (dni name
       (.str name "miscellaneous" )
       ((PIPE OS) (IDOC MISC))
       (.str insn )
       (+ opc1 opc2 (f-op-lbit4 op1) (f-op-bit4 op2) (f-data8 op3) 
(f-op-bit8 op3))
       (???)  <<<
       ()
  )
)
(sysctrl srstm srst  OP1_11 OP2_7 4 8 183 )
(sysctrl idlem idle  OP1_8 OP2_7 7 8 135)
(sysctrl pwrdnm pwrdn  OP1_9 OP2_7 6 8 151)
(sysctrl diswdtm diswdt  OP1_10 OP2_5 5 10 165)
(sysctrl enwdtm enwdt  OP1_8 OP2_5 7 10 133)
(sysctrl einitm einit  OP1_11 OP2_5 4 10 181)
(sysctrl srvwdtm srvwdt  OP1_10 OP2_7 5 8 167 )

;s/w brk
; SBRK
(dni sbrk "sbrk"
     ((PIPE OS) (IDOC MISC))
     "sbrk"
     (+ OP1_8 OP2_12 (f-op-bit8 0))
     (???)  <<<
     ()
)

;prioritize register
;PRIOR Rwn,Rwm
(dni prior "add registers"
     ((PIPE OS) (IDOC ALU))
     "prior $dr,$sr"
     (+ OP1_2 OP2_11 dr sr)
     (sequence ((HI count) (HI tmp1) (HI tmp2))
          (set HI count (const 0))
          (set HI tmp1 sr)
          (set HI tmp2 (and tmp1 (const 32768)))
 >>          (cond HI
 >>            ((ne HI tmp2 (const 1)) (ne HI sr (const 0))
 >>               (sll HI tmp1 (const 1))
 >>               (set HI tmp2 (and tmp1 (const 32768)))
 >>               (set HI count (add HI count (const 1)))
 >>            )
 >>           )
           (set HI dr count)
      )
      ()
)