m68k/gen/resumecontext.S

1.1.2.1  scw /*	$NetBSD: resumecontext.S,v 1.1.2.1 2001/11/10 21:28:05 scw Exp $	*/
1.1.2.1  scw
1.1.2.1  scw /*-
1.1.2.1  scw  * Copyright (c) 2001 The NetBSD Foundation, Inc.
1.1.2.1  scw  * All rights reserved.
1.1.2.1  scw  *
1.1.2.1  scw  * This code is derived from software contributed to The NetBSD Foundation
1.1.2.1  scw  * by Klaus Klein.
1.1.2.1  scw  *
1.1.2.1  scw  * Redistribution and use in source and binary forms, with or without
1.1.2.1  scw  * modification, are permitted provided that the following conditions
1.1.2.1  scw  * are met:
1.1.2.1  scw  * 1. Redistributions of source code must retain the above copyright
1.1.2.1  scw  *    notice, this list of conditions and the following disclaimer.
1.1.2.1  scw  * 2. Redistributions in binary form must reproduce the above copyright
1.1.2.1  scw  *    notice, this list of conditions and the following disclaimer in the
1.1.2.1  scw  *    documentation and/or other materials provided with the distribution.
1.1.2.1  scw  * 3. All advertising materials mentioning features or use of this software
1.1.2.1  scw  *    must display the following acknowledgement:
1.1.2.1  scw  *        This product includes software developed by the NetBSD
1.1.2.1  scw  *        Foundation, Inc. and its contributors.
1.1.2.1  scw  * 4. Neither the name of The NetBSD Foundation nor the names of its
1.1.2.1  scw  *    contributors may be used to endorse or promote products derived
1.1.2.1  scw  *    from this software without specific prior written permission.
1.1.2.1  scw  *
1.1.2.1  scw  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
1.1.2.1  scw  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
1.1.2.1  scw  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
1.1.2.1  scw  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
1.1.2.1  scw  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.1.2.1  scw  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.1.2.1  scw  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
1.1.2.1  scw  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
1.1.2.1  scw  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.1.2.1  scw  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
1.1.2.1  scw  * POSSIBILITY OF SUCH DAMAGE.
1.1.2.1  scw  */
1.1.2.1  scw
1.1.2.1  scw #include <machine/asm.h>
1.1.2.1  scw
1.1.2.1  scw #if defined(LIBC_SCCS) && !defined(lint)
1.1.2.1  scw 	RCSID("$NetBSD: resumecontext.S,v 1.1.2.1 2001/11/10 21:28:05 scw Exp $")
1.1.2.1  scw #endif /* LIBC_SCCS && !lint */
1.1.2.1  scw
1.1.2.1  scw /*
1.1.2.1  scw  * This assembly-language implementation differs from the (obvious)
1.1.2.1  scw  * C-language implementation only in not clobbering the previous
1.1.2.1  scw  * function's return address (us), which is the point of the exercise.
1.1.2.1  scw  */
1.1.2.1  scw
1.1.2.1  scw ENTRY(_resumecontext)
1.1.2.1  scw 	subl	#(4 + 1024),%sp		| retattr preservation + ucontext_t
1.1.2.1  scw 	lea	%sp@,%a0
1.1.2.1  scw 	movl	%a0,%sp@-
1.1.2.1  scw 	jbsr	PIC_PLT(_C_LABEL(_getcontext))
1.1.2.1  scw 	movl	%sp@(4 + 4),%sp@
1.1.2.1  scw 	jbsr	PIC_PLT(_C_LABEL(setcontext))
1.1.2.1  scw 	/* NOTREACHED */