Home | History | Annotate | Line # | Download | only in gen
swapcontext.S revision 1.1 
      1 /*	$NetBSD: swapcontext.S,v 1.1 2006/07/01 16:37:20 ross Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2001 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Klaus Klein.
      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  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include "SYS.h"
     40 #include "assym.h"
     41 
     42 #if defined(LIBC_SCCS) && !defined(lint)
     43 	.text
     44 	.asciz "$NetBSD: swapcontext.S,v 1.1 2006/07/01 16:37:20 ross Exp $"
     45 #endif /* LIBC_SCCS && !lint */
     46 
     47 ENTRY(swapcontext)
     48 	stdu	%r1,-SF_SZ(%r1)			# set up new stack frame
     49 	mflr	%r0
     50 	std	%r0,SF_SZ+SF_LR(%r1)		# save link register
     51 	stw	%r3,SF_PARAM(%r1)		# must save oucp (was 8)
     52 	stw	%r4,SF_PARAM+8(%r1)		# must save ucp (was 12)
     53 	bl	PIC_PLT(_C_LABEL(_getcontext))	# getcontext(oucp)
     54 	nop
     55 	cmpdi	%r3,0
     56 	bne	1f
     57 	ld	%r11,SF_PARAM(%r1)		# load oucp for adjustment
     58 	lwz	%r0,SF_SZ+SF_LR(%r1)		# get lr back
     59 	stw	%r0,(48 + 34 * 4)(%r11)		# pc <- lr
     60 	la	%r0,16(%r1)
     61 	stw	%r0,(48 +  1 * 4)(%r11)		# adjust sp
     62 	lwz	%r3,12(%r1)			# load ucp
     63 	bl	PIC_PLT(_C_LABEL(setcontext))	# setcontext(ucp)
     64 1:
     65 	ld	%r0,SF_SZ+SF_LR(%r1)
     66 	mtlr	%r0
     67 	la	%r1,SF_SZ(%r1)
     68 	blr
     69