1/* $NetBSD: swapcontext.S,v 1.2 2003/01/18 11:10:44 thorpej 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#include <machine/mcontext.h> 41 42#if defined(SYSLIBC_SCCS) && !defined(lint) 43 ASMSTR("$NetBSD: swapcontext.S,v 1.2 2003/01/18 11:10:44 thorpej Exp $") 44#endif /* SYSLIBC_SCCS && !lint */ 45 46#ifdef __ABICALLS__ 47 .abicalls 48#endif 49 .set reorder 50 51NESTED(swapcontext, CALLFRAME_SIZ, ra) 52 .mask 0x80000030, (CALLFRAME_RA - CALLFRAME_SIZ) 53 subu sp, sp, CALLFRAME_SIZ 54 sw ra, CALLFRAME_RA(sp) # save ra 55 sw a0, 0(sp) # stash away oucp 56 sw a1, 4(sp) # stash away ucp 57 SYSTRAP(getcontext) 58 lw ra, CALLFRAME_RA(sp) 59 bne a3, zero, 1f 60 61 lw v1, 0(sp) # load oucp again for adjustment 62 lw a0, 4(sp) # load ucp 63 addiu v0, sp, CALLFRAME_SIZ 64 REG_PROLOGUE 65 REG_S zero, (_OFFSETOF_UC_GREGS + _REG_V0 * SZREG)(v1) 66 REG_S ra, (_OFFSETOF_UC_GREGS + _REG_EPC * SZREG)(v1) 67 REG_S v0, (_OFFSETOF_UC_GREGS + _REG_SP * SZREG)(v1) 68 REG_EPILOGUE 69 70 SYSTRAP(setcontext) 71 /* NOTREACHED */ 721: 73 addiu sp, sp, CALLFRAME_SIZ 74 la t9, _C_LABEL(__cerror) 75 jr t9 76END(swapcontext) 77