swapcontext.S revision 1.3
1 1.3 petrov /* $NetBSD: swapcontext.S,v 1.3 2003/05/23 18:20:14 petrov Exp $ */ 2 1.2 thorpej 3 1.2 thorpej /*- 4 1.2 thorpej * Copyright (c) 2001 The NetBSD Foundation, Inc. 5 1.2 thorpej * All rights reserved. 6 1.2 thorpej * 7 1.2 thorpej * This code is derived from software contributed to The NetBSD Foundation 8 1.2 thorpej * by Klaus Klein. 9 1.2 thorpej * 10 1.2 thorpej * Redistribution and use in source and binary forms, with or without 11 1.2 thorpej * modification, are permitted provided that the following conditions 12 1.2 thorpej * are met: 13 1.2 thorpej * 1. Redistributions of source code must retain the above copyright 14 1.2 thorpej * notice, this list of conditions and the following disclaimer. 15 1.2 thorpej * 2. Redistributions in binary form must reproduce the above copyright 16 1.2 thorpej * notice, this list of conditions and the following disclaimer in the 17 1.2 thorpej * documentation and/or other materials provided with the distribution. 18 1.2 thorpej * 3. All advertising materials mentioning features or use of this software 19 1.2 thorpej * must display the following acknowledgement: 20 1.2 thorpej * This product includes software developed by the NetBSD 21 1.2 thorpej * Foundation, Inc. and its contributors. 22 1.2 thorpej * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.2 thorpej * contributors may be used to endorse or promote products derived 24 1.2 thorpej * from this software without specific prior written permission. 25 1.2 thorpej * 26 1.2 thorpej * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.2 thorpej * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.2 thorpej * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.2 thorpej * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.2 thorpej * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.2 thorpej * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.2 thorpej * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.2 thorpej * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.2 thorpej * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.2 thorpej * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.2 thorpej * POSSIBILITY OF SUCH DAMAGE. 37 1.2 thorpej */ 38 1.2 thorpej 39 1.2 thorpej #include "SYS.h" 40 1.2 thorpej 41 1.2 thorpej #if defined(LIBC_SCCS) && !defined(lint) 42 1.3 petrov RCSID("$NetBSD: swapcontext.S,v 1.3 2003/05/23 18:20:14 petrov Exp $") 43 1.2 thorpej #endif /* LIBC_SCCS && !lint */ 44 1.3 petrov 45 1.3 petrov .register %g2,#scratch 46 1.2 thorpej 47 1.2 thorpej ENTRY(swapcontext) 48 1.2 thorpej mov %o0, %o2 /* must save pointer */ 49 1.2 thorpej mov %o1, %o3 /* must save pointer */ 50 1.2 thorpej mov SYS_getcontext, %g1 51 1.2 thorpej t ST_SYSCALL 52 1.2 thorpej bcc,a 1f 53 1.2 thorpej stx %g0, [%o2 + 64 + 11 * 8] /* gr[_REG_O0] = 0 */ 54 1.2 thorpej ERROR() 55 1.2 thorpej 1: 56 1.2 thorpej add %o7, 12, %o1 57 1.2 thorpej stx %o1, [%o2 + 64 + 2 * 8] /* gr[_REG_nPC] = retaddr + 4 */ 58 1.2 thorpej add %o7, 8, %o1 59 1.2 thorpej stx %o1, [%o2 + 64 + 1 * 8] /* gr[_REG_PC] = retaddr */ 60 1.2 thorpej 61 1.2 thorpej mov %o3, %o0 62 1.2 thorpej mov %o1, %g2 /* optimize `return' */ 63 1.2 thorpej mov SYS_setcontext|SYSCALL_G2RFLAG, %g1 64 1.2 thorpej t ST_SYSCALL 65 1.2 thorpej ERROR() 66
Indexes created Mon Sep 29 21:09:56 GMT 2025