/ error	= gldav(svec);
/ 	  short svec[3];

.globl	_gldav
.globl	cerror

_gldav:
	mov	r5,-(sp)
	mov	sp,r5
	mov	4(r5),r0
	sys	local; 9f
	bec	1f
	jmp	cerror
1:
	clr	r0
	mov	(sp)+,r5
	rts	pc
.data
9:
	sys	gldav