1*e415d488SLionel Sambuc/* $NetBSD: swapcontext.S,v 1.4 2011/01/25 02:38:15 matt Exp $ */ 22fe8fb19SBen Gras 32fe8fb19SBen Gras/*- 42fe8fb19SBen Gras * Copyright (c) 2003 The NetBSD Foundation, Inc. 52fe8fb19SBen Gras * All rights reserved. 62fe8fb19SBen Gras * 72fe8fb19SBen Gras * This code is derived from software contributed to The NetBSD Foundation 82fe8fb19SBen Gras * by Matt Thomas. 92fe8fb19SBen Gras * 102fe8fb19SBen Gras * Redistribution and use in source and binary forms, with or without 112fe8fb19SBen Gras * modification, are permitted provided that the following conditions 122fe8fb19SBen Gras * are met: 132fe8fb19SBen Gras * 1. Redistributions of source code must retain the above copyright 142fe8fb19SBen Gras * notice, this list of conditions and the following disclaimer. 152fe8fb19SBen Gras * 2. Redistributions in binary form must reproduce the above copyright 162fe8fb19SBen Gras * notice, this list of conditions and the following disclaimer in the 172fe8fb19SBen Gras * documentation and/or other materials provided with the distribution. 182fe8fb19SBen Gras * 192fe8fb19SBen Gras * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 202fe8fb19SBen Gras * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 212fe8fb19SBen Gras * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 222fe8fb19SBen Gras * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 232fe8fb19SBen Gras * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 242fe8fb19SBen Gras * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 252fe8fb19SBen Gras * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 262fe8fb19SBen Gras * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 272fe8fb19SBen Gras * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 282fe8fb19SBen Gras * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 292fe8fb19SBen Gras * POSSIBILITY OF SUCH DAMAGE. 302fe8fb19SBen Gras */ 312fe8fb19SBen Gras 322fe8fb19SBen Gras#include "SYS.h" 332fe8fb19SBen Gras 34*e415d488SLionel Sambuc#ifdef LIBC_SCCS 35*e415d488SLionel SambucRCSID("$NetBSD: swapcontext.S,v 1.4 2011/01/25 02:38:15 matt Exp $") 36*e415d488SLionel Sambuc#endif 37*e415d488SLionel Sambuc 382fe8fb19SBen GrasENTRY(swapcontext, 0) 392fe8fb19SBen Gras clrl %r0 /* assume getcontext succeeds */ 402fe8fb19SBen Gras chmk $SYS_getcontext /* getcontext(oucp) */ 412fe8fb19SBen Gras jcc 1f 422fe8fb19SBen Gras jmp CERROR+2 /* something bad happened */ 432fe8fb19SBen Gras 442fe8fb19SBen Gras1: movl 4(%ap),%r0 /* get oucp */ 452fe8fb19SBen Gras addl3 (%ap),$(5+1),%r1 /* size of callframe + arglist (LW) */ 462fe8fb19SBen Gras bbs $13,6(%fp),2f /* was this a CALLG? */ 472fe8fb19SBen Gras movl $5,%r1 /* size of callframe (in LW) */ 482fe8fb19SBen Gras2: movl 8(%fp),(36+12*4)(%r0) /* restore AP */ 492fe8fb19SBen Gras moval (%sp)[%r1],(36+13*4)(%r0) /* restore SP */ 502fe8fb19SBen Gras movq 12(%fp),(36+14*4)(%r0) /* restore FP + PC */ 512fe8fb19SBen Gras 522fe8fb19SBen Gras pushl 8(%ap) 532fe8fb19SBen Gras calls $1,_C_LABEL(setcontext) /* setcontext(ucp) */ 542fe8fb19SBen Gras ret 55*e415d488SLionel SambucEND(swapcontext) 56