minix/lib/nbsd_libc/arch/powerpc64/gen/swapcontext.S

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/* $NetBSD: swapcontext.S,v 1.3 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)
.text
.asciz "$NetBSD: swapcontext.S,v 1.3 2008/04/28 20:22:57 martin Exp $"
#endif /* LIBC_SCCS && !lint */
ENTRY(swapcontext)
mc_off = 56 # offset of uc_mcontext
stdu %r1,-SF_SZ(%r1) # set up new stack frame
mflr %r0
std %r0,[SF_SZ+SF_LR](%r1) # save link register
std %r3,SF_PARAM(%r1) # must save oucp (was 8)
std %r4,SF_PARAM+8(%r1) # must save ucp (was 12)
bl ._getcontext # getcontext(oucp)
nop
cmpdi %r3,0
bne 1f
ld %r11,SF_PARAM(%r1) # load oucp for adjustment
ld %r0,SF_SZ+SF_LR(%r1) # get LR back
std %r0,mc_off+34*8(%r11) # pc <- lr
la %r0,16(%r1)
std %r0,mc_off+1*8(%r11) # adjust sp
ld %r3,SF_PARAM+8(%r1) # load ucp
bl .setcontext # setcontext(ucp)
nop
1:
ld %r0,SF_SZ+SF_LR(%r1)
mtlr %r0
la %r1,SF_SZ(%r1)
blr