/ C library -- tell / / long tell(f) -- returns offset of file f. tell = 40. .globl _tell .globl _errno _tell: mov r5,-(sp) mov sp,r5 mov 4(r5),r0 sys tell bec 1f mov r0,_errno mov $-1,r0 mov r0,r1 1: mov (sp)+,r5 rts pc