dup.s 138 B

12345678
  1. .sect .text; .sect .rom; .sect .data; .sect .bss; .sect .text
  2. .define _dup
  3. .extern _dup, cerror
  4. _dup: int 0xc9
  5. jb 9f
  6. ret
  7. 9: jmp cerror