1/* $NetBSD: swapcontext.S,v 1.2 2003/01/18 11:12:54 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 41#if defined(LIBC_SCCS) && !defined(lint) 42 .text 43 .asciz "$NetBSD: swapcontext.S,v 1.2 2003/01/18 11:12:54 thorpej Exp $" 44#endif /* LIBC_SCCS && !lint */ 45 46ENTRY(swapcontext) 47 stwu 1, -16(1) # set up new stack frame 48 mflr 0 49 stw 0, 20(1) # save link register 50 stw 3, 8(1) # must save oucp 51 stw 4, 12(1) # must save ucp 52 bl PIC_PLT(_C_LABEL(_getcontext)) # getcontext(oucp) 53 cmpwi 3, 0 54 bne 1f 55 lwz 11, 8(1) # load oucp for adjustment 56 lwz 0, 20(1) 57 stw 0, (48 + 34 * 4)(11) # pc <- lr 58 la 0, 16(1) 59 stw 0, (48 + 1 * 4)(11) # adjust sp 60 lwz 3, 12(1) # load ucp 61 bl PIC_PLT(_C_LABEL(setcontext)) # setcontext(ucp) 621: 63 lwz 0, 20(1) 64 mtlr 0 65 la 1, 16(1) 66 blr 67