2.9BSD/usr/src/lib/c/sys/reboot.s

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/ error	= reboot(howto, dev);
/	  dev_t dev;

.globl	_reboot
.globl	cerror

_reboot:
	mov	r5,-(sp)
	mov	sp,r5
	mov	4(r5),0f
	mov	6(r5),0f+2
	sys	0; 9f
	bec	1f
	jmp	cerror
1:
	clr	r0
	mov	(sp)+,r5
	rts	pc
.data
9:
	sys	reboot; 0:..; ..