swapcontext.S revision 1.3
1 /* $NetBSD: swapcontext.S,v 1.3 2003/05/23 18:20:14 petrov 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 RCSID("$NetBSD: swapcontext.S,v 1.3 2003/05/23 18:20:14 petrov Exp $") 43 #endif /* LIBC_SCCS && !lint */ 44 45 .register %g2,#scratch 46 47 ENTRY(swapcontext) 48 mov %o0, %o2 /* must save pointer */ 49 mov %o1, %o3 /* must save pointer */ 50 mov SYS_getcontext, %g1 51 t ST_SYSCALL 52 bcc,a 1f 53 stx %g0, [%o2 + 64 + 11 * 8] /* gr[_REG_O0] = 0 */ 54 ERROR() 55 1: 56 add %o7, 12, %o1 57 stx %o1, [%o2 + 64 + 2 * 8] /* gr[_REG_nPC] = retaddr + 4 */ 58 add %o7, 8, %o1 59 stx %o1, [%o2 + 64 + 1 * 8] /* gr[_REG_PC] = retaddr */ 60 61 mov %o3, %o0 62 mov %o1, %g2 /* optimize `return' */ 63 mov SYS_setcontext|SYSCALL_G2RFLAG, %g1 64 t ST_SYSCALL 65 ERROR() 66
Indexes created Mon Sep 29 21:09:56 GMT 2025