1/* $NetBSD: swapcontext.S,v 1.2 2003/01/18 11:04:40 thorpej Exp $ */ 2 3/*- 4 * Copyright (c) 2001 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Klaus Klein. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39#include "SYS.h" 40 41NESTED(swapcontext, 2, 24, ra, IM_RA|IM_A0|IM_A1, 0) 42 LDGP(pv) 43 lda sp, -24(sp) 44 stq ra, (24- 8)(sp) /* must save ra, oucp, ucp */ 45 stq a0, (24-16)(sp) 46 stq a1, (24-24)(sp) 47 CALL(_getcontext) /* getcontext(oucp) */ 48 ldq t0, (24-16)(sp) 49 bne v0, Lerr 50 ldq t1, (24- 8)(sp) 51 stq t1, (56 + 26 * 8)(t0) /* Adjust saved RA */ 52 stq t1, (56 + 32 * 8)(t0) /* Adjust saved PC */ 53 lda t1, 24(sp) 54 stq t1, (56 + 30 * 8)(t0) /* Adjust saved SP */ 55 56 ldq a0, (24-24)(sp) 57 CALL(setcontext) /* setcontext(ucp) */ 58Lerr: 59 ldq ra, (24- 8)(sp) 60 lda sp, 24(sp) 61 RET 62END(swapcontext) 63