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      1 /*	$NetBSD: getcontext.S,v 1.2 2008/04/28 20:22:57 martin 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  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include "SYS.h"
     33 
     34 #if defined(SYSLIBC_SCCS) && !defined(lint)
     35 	RCSID("$NetBSD: getcontext.S,v 1.2 2008/04/28 20:22:57 martin Exp $")
     36 #endif /* SYSLIBC_SCCS && !lint */
     37 
     38 #ifdef WEAK_ALIAS
     39 WEAK_ALIAS(getcontext, _getcontext)
     40 #endif
     41 
     42 ENTRY(_getcontext)
     43 	mov	%o0, %o2			! must save pointer
     44 	mov	SYS_getcontext, %g1
     45 	t	ST_SYSCALL
     46 	bcc,a	1f
     47 	 clr	[%o2 + 40 + 11 * 4]		! gr[_REG_O0] = 0
     48 	ERROR()
     49 1:
     50 	add	%o7, 8, %o1
     51 	st	%o1, [%o2 + 40 + 1 * 4]		! gr[_REG_PC] = retaddr
     52 	add	%o7, 12, %o1
     53 	retl
     54 	 st	%o1, [%o2 + 40 + 2 * 4]		! gr[_REG_nPC] = retaddr + 4
     55