swapcontext.S revision 1.3
1 /* $NetBSD: swapcontext.S,v 1.3 2003/07/01 14:35:44 marcus 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 <machine/asm.h> 40 #if defined(SYSLIBC_SCCS) && !defined(lint) 41 RCSID("$NetBSD: swapcontext.S,v 1.3 2003/07/01 14:35:44 marcus Exp $") 42 #endif /* SYSLIBC_SCCS and not lint */ 43 44 ENTRY(swapcontext) 45 mov.l r5, @-r15 46 sts.l pr, @-r15 47 mov.l _L._getcontext, r0 48 #ifdef PIC 49 bsrf r0 50 #else 51 jsr @r0 52 #endif 53 mov.l r4, @-r15 54 2: 55 mov.l @r15+, r1 56 tst r0, r0 57 bf 1f 58 mov.l @r15, r0 59 mov.l r0, @(36 + 1 * 4, r1) /* saved pc <- pr */ 60 mov.l _L.setcontext, r2 61 #ifdef PIC 62 bsrf r2 63 #else 64 jsr @r2 65 #endif 66 mov.l @(4, r15), r4 67 1: 68 lds.l @r15+, pr 69 rts 70 add #4, r15 71 72 .align 2 73 #ifdef PIC 74 _L._getcontext: .long _C_LABEL(_getcontext)-2b 75 _L.setcontext: .long _C_LABEL(setcontext)-1b 76 #else 77 _L._getcontext: .long _C_LABEL(_getcontext) 78 _L.setcontext: .long _C_LABEL(setcontext) 79 #endif 80
Indexes created Sun Oct 12 09:09:55 GMT 2025