63 lines
2.3 KiB
ArmAsm
63 lines
2.3 KiB
ArmAsm
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/* $NetBSD: swapcontext.S,v 1.3 2008/04/28 20:22:57 martin Exp $ */
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/*-
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* Copyright (c) 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Klaus Klein.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "SYS.h"
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#if defined(LIBC_SCCS) && !defined(lint)
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.text
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.asciz "$NetBSD: swapcontext.S,v 1.3 2008/04/28 20:22:57 martin Exp $"
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#endif /* LIBC_SCCS && !lint */
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ENTRY(swapcontext)
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mc_off = 56 # offset of uc_mcontext
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stdu %r1,-SF_SZ(%r1) # set up new stack frame
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mflr %r0
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std %r0,[SF_SZ+SF_LR](%r1) # save link register
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std %r3,SF_PARAM(%r1) # must save oucp (was 8)
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std %r4,SF_PARAM+8(%r1) # must save ucp (was 12)
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bl ._getcontext # getcontext(oucp)
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nop
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cmpdi %r3,0
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bne 1f
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ld %r11,SF_PARAM(%r1) # load oucp for adjustment
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ld %r0,SF_SZ+SF_LR(%r1) # get LR back
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std %r0,mc_off+34*8(%r11) # pc <- lr
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la %r0,16(%r1)
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std %r0,mc_off+1*8(%r11) # adjust sp
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ld %r3,SF_PARAM+8(%r1) # load ucp
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bl .setcontext # setcontext(ucp)
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nop
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1:
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ld %r0,SF_SZ+SF_LR(%r1)
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mtlr %r0
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la %r1,SF_SZ(%r1)
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blr
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