1/* $NetBSD: swapcontext.S,v 1.4 2011/01/25 02:38:15 matt Exp $ */ 2 3/*- 4 * Copyright (c) 2003 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Matt Thomas. 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#ifdef LIBC_SCCS 35RCSID("$NetBSD: swapcontext.S,v 1.4 2011/01/25 02:38:15 matt Exp $") 36#endif 37 38ENTRY(swapcontext, 0) 39 clrl %r0 /* assume getcontext succeeds */ 40 chmk $SYS_getcontext /* getcontext(oucp) */ 41 jcc 1f 42 jmp CERROR+2 /* something bad happened */ 43 441: movl 4(%ap),%r0 /* get oucp */ 45 addl3 (%ap),$(5+1),%r1 /* size of callframe + arglist (LW) */ 46 bbs $13,6(%fp),2f /* was this a CALLG? */ 47 movl $5,%r1 /* size of callframe (in LW) */ 482: movl 8(%fp),(36+12*4)(%r0) /* restore AP */ 49 moval (%sp)[%r1],(36+13*4)(%r0) /* restore SP */ 50 movq 12(%fp),(36+14*4)(%r0) /* restore FP + PC */ 51 52 pushl 8(%ap) 53 calls $1,_C_LABEL(setcontext) /* setcontext(ucp) */ 54 ret 55END(swapcontext) 56