umount.s

unix v7是最后一个广泛发布的研究型UNIX版本

/ C library -- umount

.globl	_umount
.globl	cerror
indir	= 0
.umount = 22.
.comm	_errno,2

_umount:
	mov	r5,-(sp)
	mov	sp,r5
	mov	4(sp),0f
	sys	indir; 9f
	bec	1f
	jmp	cerror
1:
	clr	r0
	mov	(sp)+,r5
	rts	pc

.data
9:
	sys	.umount; 0:..