1/* $NetBSD: swapcontext.S,v 1.5 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 34#if defined(LIBC_SCCS) && !defined(lint) 35 RCSID("$NetBSD: swapcontext.S,v 1.5 2008/04/28 20:22:55 martin Exp $") 36#endif /* LIBC_SCCS && !lint */ 37 38ENTRY(swapcontext) 39 stmfd sp!, {r0-r1, lr} /* Must save oucp, ucp, lr. */ 40 bl PIC_SYM(_C_LABEL(_getcontext), PLT) /* getcontext(oucp) */ 41 cmp r0, #0 42 ldmfd sp!, {r0-r1, lr} 43 RETc(ne) 44 str lr, [r0, #(36 + 15*4)] /* Adjust saved PC. */ 45#ifdef SOFTFLOAT 46 /* Ahem. */ 47#endif 48 mov r0, r1 49 bl PIC_SYM(_C_LABEL(setcontext), PLT) 50 RET 51