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swapcontext.S revision 1.3.8.2 
      1  1.3.8.2  martin /*	$NetBSD: swapcontext.S,v 1.3.8.2 2008/04/28 20:22:57 martin Exp $	*/
      2  1.3.8.2  martin 
      3  1.3.8.2  martin /*-
      4  1.3.8.2  martin  * Copyright (c) 2001 The NetBSD Foundation, Inc.
      5  1.3.8.2  martin  * All rights reserved.
      6  1.3.8.2  martin  *
      7  1.3.8.2  martin  * This code is derived from software contributed to The NetBSD Foundation
      8  1.3.8.2  martin  * by Klaus Klein.
      9  1.3.8.2  martin  *
     10  1.3.8.2  martin  * Redistribution and use in source and binary forms, with or without
     11  1.3.8.2  martin  * modification, are permitted provided that the following conditions
     12  1.3.8.2  martin  * are met:
     13  1.3.8.2  martin  * 1. Redistributions of source code must retain the above copyright
     14  1.3.8.2  martin  *    notice, this list of conditions and the following disclaimer.
     15  1.3.8.2  martin  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.3.8.2  martin  *    notice, this list of conditions and the following disclaimer in the
     17  1.3.8.2  martin  *    documentation and/or other materials provided with the distribution.
     18  1.3.8.2  martin  *
     19  1.3.8.2  martin  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  1.3.8.2  martin  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  1.3.8.2  martin  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  1.3.8.2  martin  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  1.3.8.2  martin  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  1.3.8.2  martin  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  1.3.8.2  martin  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  1.3.8.2  martin  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  1.3.8.2  martin  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  1.3.8.2  martin  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  1.3.8.2  martin  * POSSIBILITY OF SUCH DAMAGE.
     30  1.3.8.2  martin  */
     31  1.3.8.2  martin 
     32  1.3.8.2  martin #include "SYS.h"
     33  1.3.8.2  martin 
     34  1.3.8.2  martin #if defined(LIBC_SCCS) && !defined(lint)
     35  1.3.8.2  martin 	RCSID("$NetBSD: swapcontext.S,v 1.3.8.2 2008/04/28 20:22:57 martin Exp $")
     36  1.3.8.2  martin #endif /* LIBC_SCCS && !lint */
     37  1.3.8.2  martin 
     38  1.3.8.2  martin ENTRY(swapcontext)
     39  1.3.8.2  martin 	movl	%sp@(4),%sp@-		| push oucp on stack
     40  1.3.8.2  martin 	jbsr	PIC_PLT(_C_LABEL(_getcontext))	| getcontext(oucp)
     41  1.3.8.2  martin 	tstl	%d0			| OK?
     42  1.3.8.2  martin 	jne	L1
     43  1.3.8.2  martin 	movl	%sp@,%a0
     44  1.3.8.2  martin 	addql	#8,%a0@(96)		| adjust saved stack pointer (again)
     45  1.3.8.2  martin 	movl	%sp@(4),%a0@(100)	| adjust saved program counter (again)
     46  1.3.8.2  martin 	movl	%sp@(12),%sp@		| push ucp on stack
     47  1.3.8.2  martin 	jbsr	PIC_PLT(_C_LABEL(setcontext))	| setcontext(ucp)
     48  1.3.8.2  martin L1:	addql	#4,%sp			| pop ucp
     49  1.3.8.2  martin 	rts
     50