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swapcontext.S revision 1.3 
      1  1.3  martin /*	$NetBSD: swapcontext.S,v 1.3 2008/04/28 20:22:57 martin Exp $	*/
      2  1.1    ross 
      3  1.1    ross /*-
      4  1.1    ross  * Copyright (c) 2001 The NetBSD Foundation, Inc.
      5  1.1    ross  * All rights reserved.
      6  1.1    ross  *
      7  1.1    ross  * This code is derived from software contributed to The NetBSD Foundation
      8  1.1    ross  * by Klaus Klein.
      9  1.1    ross  *
     10  1.1    ross  * Redistribution and use in source and binary forms, with or without
     11  1.1    ross  * modification, are permitted provided that the following conditions
     12  1.1    ross  * are met:
     13  1.1    ross  * 1. Redistributions of source code must retain the above copyright
     14  1.1    ross  *    notice, this list of conditions and the following disclaimer.
     15  1.1    ross  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.1    ross  *    notice, this list of conditions and the following disclaimer in the
     17  1.1    ross  *    documentation and/or other materials provided with the distribution.
     18  1.1    ross  *
     19  1.1    ross  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  1.1    ross  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  1.1    ross  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  1.1    ross  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  1.1    ross  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  1.1    ross  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  1.1    ross  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  1.1    ross  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  1.1    ross  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  1.1    ross  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  1.1    ross  * POSSIBILITY OF SUCH DAMAGE.
     30  1.1    ross  */
     31  1.1    ross 
     32  1.1    ross #include "SYS.h"
     33  1.1    ross 
     34  1.1    ross #if defined(LIBC_SCCS) && !defined(lint)
     35  1.1    ross 	.text
     36  1.3  martin 	.asciz "$NetBSD: swapcontext.S,v 1.3 2008/04/28 20:22:57 martin Exp $"
     37  1.1    ross #endif /* LIBC_SCCS && !lint */
     38  1.1    ross 
     39  1.1    ross ENTRY(swapcontext)
     40  1.2    ross 	mc_off	= 56				# offset of uc_mcontext
     41  1.1    ross 	stdu	%r1,-SF_SZ(%r1)			# set up new stack frame
     42  1.1    ross 	mflr	%r0
     43  1.2    ross 	std	%r0,[SF_SZ+SF_LR](%r1)		# save link register
     44  1.2    ross 	std	%r3,SF_PARAM(%r1)		# must save oucp (was 8)
     45  1.2    ross 	std	%r4,SF_PARAM+8(%r1)		# must save ucp (was 12)
     46  1.2    ross 	bl	._getcontext			# getcontext(oucp)
     47  1.1    ross 	nop
     48  1.1    ross 	cmpdi	%r3,0
     49  1.1    ross 	bne	1f
     50  1.1    ross 	ld	%r11,SF_PARAM(%r1)		# load oucp for adjustment
     51  1.2    ross 	ld	%r0,SF_SZ+SF_LR(%r1)		# get LR back
     52  1.2    ross 	std	%r0,mc_off+34*8(%r11)	# 	pc <- lr
     53  1.1    ross 	la	%r0,16(%r1)
     54  1.2    ross 	std	%r0,mc_off+1*8(%r11)		# adjust sp
     55  1.2    ross 	ld	%r3,SF_PARAM+8(%r1)			# load ucp
     56  1.2    ross 	bl	.setcontext			# setcontext(ucp)
     57  1.2    ross 	nop
     58  1.1    ross 1:
     59  1.1    ross 	ld	%r0,SF_SZ+SF_LR(%r1)
     60  1.1    ross 	mtlr	%r0
     61  1.1    ross 	la	%r1,SF_SZ(%r1)
     62  1.1    ross 	blr
     63