/* $NetBSD: swapcontext.S,v 1.4 2011/01/25 02:38:15 matt Exp $ */ /*- * Copyright (c) 2003 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Matt Thomas. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include "SYS.h" #ifdef LIBC_SCCS RCSID("$NetBSD: swapcontext.S,v 1.4 2011/01/25 02:38:15 matt Exp $") #endif ENTRY(swapcontext, 0) clrl %r0 /* assume getcontext succeeds */ chmk $SYS_getcontext /* getcontext(oucp) */ jcc 1f jmp CERROR+2 /* something bad happened */ 1: movl 4(%ap),%r0 /* get oucp */ addl3 (%ap),$(5+1),%r1 /* size of callframe + arglist (LW) */ bbs $13,6(%fp),2f /* was this a CALLG? */ movl $5,%r1 /* size of callframe (in LW) */ 2: movl 8(%fp),(36+12*4)(%r0) /* restore AP */ moval (%sp)[%r1],(36+13*4)(%r0) /* restore SP */ movq 12(%fp),(36+14*4)(%r0) /* restore FP + PC */ pushl 8(%ap) calls $1,_C_LABEL(setcontext) /* setcontext(ucp) */ ret END(swapcontext)