xref: /netbsd-src/lib/libc/arch/sparc/sys/getcontext.S (revision ce099b40997c43048fb78bd578195f81d2456523)
1*ce099b40Smartin/*	$NetBSD: getcontext.S,v 1.2 2008/04/28 20:22:57 martin Exp $	*/
213a5336cSkleink
313a5336cSkleink/*-
413a5336cSkleink * Copyright (c) 2001 The NetBSD Foundation, Inc.
513a5336cSkleink * All rights reserved.
613a5336cSkleink *
713a5336cSkleink * This code is derived from software contributed to The NetBSD Foundation
813a5336cSkleink * by Klaus Klein.
913a5336cSkleink *
1013a5336cSkleink * Redistribution and use in source and binary forms, with or without
1113a5336cSkleink * modification, are permitted provided that the following conditions
1213a5336cSkleink * are met:
1313a5336cSkleink * 1. Redistributions of source code must retain the above copyright
1413a5336cSkleink *    notice, this list of conditions and the following disclaimer.
1513a5336cSkleink * 2. Redistributions in binary form must reproduce the above copyright
1613a5336cSkleink *    notice, this list of conditions and the following disclaimer in the
1713a5336cSkleink *    documentation and/or other materials provided with the distribution.
1813a5336cSkleink *
1913a5336cSkleink * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
2013a5336cSkleink * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
2113a5336cSkleink * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
2213a5336cSkleink * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
2313a5336cSkleink * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
2413a5336cSkleink * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
2513a5336cSkleink * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
2613a5336cSkleink * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
2713a5336cSkleink * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
2813a5336cSkleink * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
2913a5336cSkleink * POSSIBILITY OF SUCH DAMAGE.
3013a5336cSkleink */
3113a5336cSkleink
3213a5336cSkleink#include "SYS.h"
3313a5336cSkleink
3413a5336cSkleink#if defined(SYSLIBC_SCCS) && !defined(lint)
35*ce099b40Smartin	RCSID("$NetBSD: getcontext.S,v 1.2 2008/04/28 20:22:57 martin Exp $")
3613a5336cSkleink#endif /* SYSLIBC_SCCS && !lint */
3713a5336cSkleink
3813a5336cSkleink#ifdef WEAK_ALIAS
3913a5336cSkleinkWEAK_ALIAS(getcontext, _getcontext)
4013a5336cSkleink#endif
4113a5336cSkleink
4213a5336cSkleinkENTRY(_getcontext)
4313a5336cSkleink	mov	%o0, %o2			! must save pointer
4413a5336cSkleink	mov	SYS_getcontext, %g1
4513a5336cSkleink	t	ST_SYSCALL
4613a5336cSkleink	bcc,a	1f
4713a5336cSkleink	 clr	[%o2 + 40 + 11 * 4]		! gr[_REG_O0] = 0
4813a5336cSkleink	ERROR()
4913a5336cSkleink1:
5013a5336cSkleink	add	%o7, 8, %o1
5113a5336cSkleink	st	%o1, [%o2 + 40 + 1 * 4]		! gr[_REG_PC] = retaddr
5213a5336cSkleink	add	%o7, 12, %o1
5313a5336cSkleink	retl
5413a5336cSkleink	 st	%o1, [%o2 + 40 + 2 * 4]		! gr[_REG_nPC] = retaddr + 4
55