1/* $NetBSD: swapcontext.S,v 1.3 2008/04/28 20:22:55 martin 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include "SYS.h" 33 34NESTED(swapcontext, 2, 24, ra, IM_RA|IM_A0|IM_A1, 0) 35 LDGP(pv) 36 lda sp, -24(sp) 37 stq ra, (24- 8)(sp) /* must save ra, oucp, ucp */ 38 stq a0, (24-16)(sp) 39 stq a1, (24-24)(sp) 40 CALL(_getcontext) /* getcontext(oucp) */ 41 ldq t0, (24-16)(sp) 42 bne v0, Lerr 43 ldq t1, (24- 8)(sp) 44 stq t1, (56 + 26 * 8)(t0) /* Adjust saved RA */ 45 stq t1, (56 + 32 * 8)(t0) /* Adjust saved PC */ 46 lda t1, 24(sp) 47 stq t1, (56 + 30 * 8)(t0) /* Adjust saved SP */ 48 49 ldq a0, (24-24)(sp) 50 CALL(setcontext) /* setcontext(ucp) */ 51Lerr: 52 ldq ra, (24- 8)(sp) 53 lda sp, 24(sp) 54 RET 55END(swapcontext) 56