2.9BSD - /usr/src/lib/c/sys/dup.s

   1: / error	= dup(fildes);
   2: / error	= dup2(fildes, fildes2);
   3: 
   4: .globl  _dup,_dup2
   5: .globl  cerror
   6: 
   7: _dup2:
   8:         mov     r5,-(sp)
   9:         mov     sp,r5
  10:         mov     4(r5),r0
  11:         bis     $100,r0
  12:         br      1f
  13: 
  14: _dup:
  15:         mov     r5,-(sp)
  16:         mov     sp,r5
  17:         mov     4(r5),r0
  18: 1:
  19:         mov     6(r5),r1
  20:         sys     dup
  21:         bec     1f
  22:         jmp     cerror
  23: 1:
  24:         mov     (sp)+,r5
  25:         rts     pc

Defined functions