swapcontext.S revision 1.2
1 /* $NetBSD: swapcontext.S,v 1.2 2006/07/05 18:12:54 ross 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 2006/07/05 18:12:54 ross Exp $" 44 #endif /* LIBC_SCCS && !lint */ 45 46 ENTRY(swapcontext) 47 mc_off = 56 # offset of uc_mcontext 48 stdu %r1,-SF_SZ(%r1) # set up new stack frame 49 mflr %r0 50 std %r0,[SF_SZ+SF_LR](%r1) # save link register 51 std %r3,SF_PARAM(%r1) # must save oucp (was 8) 52 std %r4,SF_PARAM+8(%r1) # must save ucp (was 12) 53 bl ._getcontext # getcontext(oucp) 54 nop 55 cmpdi %r3,0 56 bne 1f 57 ld %r11,SF_PARAM(%r1) # load oucp for adjustment 58 ld %r0,SF_SZ+SF_LR(%r1) # get LR back 59 std %r0,mc_off+34*8(%r11) # pc <- lr 60 la %r0,16(%r1) 61 std %r0,mc_off+1*8(%r11) # adjust sp 62 ld %r3,SF_PARAM+8(%r1) # load ucp 63 bl .setcontext # setcontext(ucp) 64 nop 65 1: 66 ld %r0,SF_SZ+SF_LR(%r1) 67 mtlr %r0 68 la %r1,SF_SZ(%r1) 69 blr 70
Indexes created Mon Sep 29 21:09:56 GMT 2025