pc := getcallerpc()
	sp := getcallersp()
	bp := getcallerfp()
	save(pc, sp, bp)
	gp.syscallsp = gp.sched.sp
	gp.syscallpc = gp.sched.pc
	gp.syscallbp = gp.sched.bp
	if gp.syscallsp < gp.stack.lo || gp.stack.hi < gp.syscallsp {
		sp1 := sp
		sp2 := gp.sched.sp
		sp3 := gp.syscallsp
		systemstack(func() {