1/* $NetBSD: swapcontext.S,v 1.4 2008/04/28 20:22:57 martin 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include "SYS.h" 33 34#if defined(LIBC_SCCS) && !defined(lint) 35 RCSID("$NetBSD: swapcontext.S,v 1.4 2008/04/28 20:22:57 martin Exp $") 36#endif /* LIBC_SCCS && !lint */ 37 38 .register %g2,#scratch 39 40ENTRY(swapcontext) 41 mov %o0, %o2 /* must save pointer */ 42 mov %o1, %o3 /* must save pointer */ 43 mov SYS_getcontext, %g1 44 t ST_SYSCALL 45 bcc,a 1f 46 stx %g0, [%o2 + 64 + 11 * 8] /* gr[_REG_O0] = 0 */ 47 ERROR() 481: 49 add %o7, 12, %o1 50 stx %o1, [%o2 + 64 + 2 * 8] /* gr[_REG_nPC] = retaddr + 4 */ 51 add %o7, 8, %o1 52 stx %o1, [%o2 + 64 + 1 * 8] /* gr[_REG_PC] = retaddr */ 53 54 mov %o3, %o0 55 mov %o1, %g2 /* optimize `return' */ 56 mov SYS_setcontext|SYSCALL_G2RFLAG, %g1 57 t ST_SYSCALL 58 ERROR() 59