1/* $NetBSD: getcontext.S,v 1.3 2004/03/09 20:21:22 drochner Exp $ */ 2 3/* 4 * Copyright (c) 2003 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Frank van der Linden for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 39#include "SYS.h" 40 41#if defined(SYSLIBC_SCCS) && !defined(lint) 42 RCSID("$NetBSD: getcontext.S,v 1.3 2004/03/09 20:21:22 drochner Exp $") 43#endif 44 45#ifdef WEAK_ALIAS 46WEAK_ALIAS(getcontext, _getcontext) 47#endif 48 49/* 50 * 56 == offsetof(ucontext_t, uc_mcontext) 51 * 14 == _REG_RAX 52 * 21 == _REG_RIP 53 * 24 == _REG_URSP 54 */ 55 56_SYSCALL(_getcontext,getcontext) 57 movq (%rsp),%r11 58 movq %r11,(56 + 21 * 8)(%rdi) 59 leaq 8(%rsp),%r11 60 movq %r11,(56 + 24 * 8)(%rdi) 61 movq $0,(56 + 14 * 8)(%rdi) 62 xorl %eax,%eax 63 ret 64