1/* $NetBSD: swapcontext.S,v 1.4 2009/12/14 01:07:42 matt 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 "assym.h" 34 35#if defined(SYSLIBC_SCCS) && !defined(lint) 36 RCSID("$NetBSD: swapcontext.S,v 1.4 2009/12/14 01:07:42 matt Exp $") 37#endif /* SYSLIBC_SCCS && !lint */ 38 39 .set reorder 40 41NESTED(swapcontext, CALLFRAME_SIZ, ra) 42 .mask 0x80000030, (CALLFRAME_RA - CALLFRAME_SIZ) 43 PTR_SUBU sp, sp, CALLFRAME_SIZ 44 PTR_S ra, CALLFRAME_RA(sp) # save ra 45 PTR_S a0, 0(sp) # stash away oucp 46 PTR_S a1, SZREG(sp) # stash away ucp 47 SYSTRAP(getcontext) 48 PTR_L ra, CALLFRAME_RA(sp) 49 bne a3, zero, 1f 50 51 PTR_L v1, 0(sp) # load oucp again for adjustment 52 PTR_L a0, SZREG(sp) # load ucp 53 PTR_ADDIU v0, sp, CALLFRAME_SIZ 54 REG_PROLOGUE 55 REG_S zero, _OFFSETOF_UC_GREGS_V0(v1) 56 REG_S ra, _OFFSETOF_UC_GREGS_EPC(v1) 57 REG_S v0, _OFFSETOF_UC_GREGS_SP(v1) 58 REG_EPILOGUE 59 60 SYSTRAP(setcontext) 61 /* NOTREACHED */ 621: 63 PTR_ADDU sp, sp, CALLFRAME_SIZ 64 SETUP_GPX(t0); 65 SETUP_GP64(t3,swapcontext); 66 PIC_TAILCALL(__cerror) 67END(swapcontext) 68