1/* $NetBSD: swapcontext.S,v 1.3 2008/04/28 20:22:56 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#include <machine/mcontext.h> 34 35#if defined(SYSLIBC_SCCS) && !defined(lint) 36 ASMSTR("$NetBSD: swapcontext.S,v 1.3 2008/04/28 20:22:56 martin Exp $") 37#endif /* SYSLIBC_SCCS && !lint */ 38 39#ifdef __ABICALLS__ 40 .abicalls 41#endif 42 .set reorder 43 44NESTED(swapcontext, CALLFRAME_SIZ, ra) 45 .mask 0x80000030, (CALLFRAME_RA - CALLFRAME_SIZ) 46 subu sp, sp, CALLFRAME_SIZ 47 sw ra, CALLFRAME_RA(sp) # save ra 48 sw a0, 0(sp) # stash away oucp 49 sw a1, 4(sp) # stash away ucp 50 SYSTRAP(getcontext) 51 lw ra, CALLFRAME_RA(sp) 52 bne a3, zero, 1f 53 54 lw v1, 0(sp) # load oucp again for adjustment 55 lw a0, 4(sp) # load ucp 56 addiu v0, sp, CALLFRAME_SIZ 57 REG_PROLOGUE 58 REG_S zero, (_OFFSETOF_UC_GREGS + _REG_V0 * SZREG)(v1) 59 REG_S ra, (_OFFSETOF_UC_GREGS + _REG_EPC * SZREG)(v1) 60 REG_S v0, (_OFFSETOF_UC_GREGS + _REG_SP * SZREG)(v1) 61 REG_EPILOGUE 62 63 SYSTRAP(setcontext) 64 /* NOTREACHED */ 651: 66 addiu sp, sp, CALLFRAME_SIZ 67 la t9, _C_LABEL(__cerror) 68 jr t9 69END(swapcontext) 70