minix/lib/libc/arch/sparc64/gen/swapcontext.S

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/* $NetBSD: swapcontext.S,v 1.4 2008/04/28 20:22:57 martin Exp $ */
/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Klaus Klein.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "SYS.h"
#if defined(LIBC_SCCS) && !defined(lint)
RCSID("$NetBSD: swapcontext.S,v 1.4 2008/04/28 20:22:57 martin Exp $")
#endif /* LIBC_SCCS && !lint */
.register %g2,#scratch
ENTRY(swapcontext)
mov %o0, %o2 /* must save pointer */
mov %o1, %o3 /* must save pointer */
mov SYS_getcontext, %g1
t ST_SYSCALL
bcc,a 1f
stx %g0, [%o2 + 64 + 11 * 8] /* gr[_REG_O0] = 0 */
ERROR()
1:
add %o7, 12, %o1
stx %o1, [%o2 + 64 + 2 * 8] /* gr[_REG_nPC] = retaddr + 4 */
add %o7, 8, %o1
stx %o1, [%o2 + 64 + 1 * 8] /* gr[_REG_PC] = retaddr */
mov %o3, %o0
mov %o1, %g2 /* optimize `return' */
mov SYS_setcontext|SYSCALL_G2RFLAG, %g1
t ST_SYSCALL
ERROR()