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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 20:22:58 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 20:22:58 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 	mov	%o0, %o2			! must save pointer
     40  1.3.8.2  martin 	mov	%o1, %o3			! must save pointer
     41  1.3.8.2  martin 	mov	SYS_getcontext, %g1
     42  1.3.8.2  martin 	t	ST_SYSCALL
     43  1.3.8.2  martin 	bcc,a	1f
     44  1.3.8.2  martin 	 st	%g0, [%o2 + 40 + 11 * 4]	! gr[_REG_O0] = 0
     45  1.3.8.2  martin 	ERROR()
     46  1.3.8.2  martin 1:
     47  1.3.8.2  martin 	add	%o7, 12, %o1
     48  1.3.8.2  martin 	st	%o1, [%o2 + 40 + 2 * 4]		! gr[_REG_nPC] = retaddr + 4
     49  1.3.8.2  martin 	add	%o7, 8, %o1
     50  1.3.8.2  martin 	st	%o1, [%o2 + 40 + 1 * 4]		! gr[_REG_PC] = retaddr
     51  1.3.8.2  martin 
     52  1.3.8.2  martin 	mov	%o3, %o0
     53  1.3.8.2  martin 	mov	%o1, %g2			! optimize `return'
     54  1.3.8.2  martin 	mov	SYS_setcontext|SYSCALL_G2RFLAG, %g1
     55  1.3.8.2  martin 	t	ST_SYSCALL
     56  1.3.8.2  martin 	ERROR()
     57