2013-12-06 12:04:52 +01:00
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/* $NetBSD: swapcontext.S,v 1.10 2013/09/12 15:36:15 joerg Exp $ */
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2011-02-14 20:36:03 +01:00
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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 <machine/asm.h>
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#if defined(SYSLIBC_SCCS) && !defined(lint)
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2013-12-06 12:04:52 +01:00
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RCSID("$NetBSD: swapcontext.S,v 1.10 2013/09/12 15:36:15 joerg Exp $")
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2011-02-14 20:36:03 +01:00
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#endif /* SYSLIBC_SCCS and not lint */
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/*
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* int
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* swapcontext(ucontext_t * restrict oucp, ucontext_t * restrict ucp);
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*/
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ENTRY(swapcontext)
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PIC_PROLOGUE(.L_got)
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mov.l r5, @-sp
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sts.l pr, @-sp
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mov.l .L__getcontext, r0
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1: CALL r0 /* _getcontext(oucp) */
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mov.l r4, @-sp
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mov.l @sp+, r1
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tst r0, r0
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bf 3f /* return error from getcontext */
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/* Note: getcontext does _UC_MACHINE_INTRV(oucp) = 0 for us */
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mov.l @sp, r0
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mov.l r0, @(36 + 1 * 4, r1) /* _UC_MACHINE_SET_PC(oucp, pr) */
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mov.l .L_setcontext, r2
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2: CALL r2 /* setcontext(ucp) */
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mov.l @(4, sp), r4
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/* if we get here, return error from setcontext */
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3:
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lds.l @sp+, pr
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2013-12-06 12:04:52 +01:00
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#ifdef __PIC__
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2011-02-14 20:36:03 +01:00
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add #4, sp
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rts
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PIC_EPILOGUE
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#else
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rts
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add #4, sp
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#endif
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.align 2
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.L_got: PIC_GOT_DATUM
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.L__getcontext: CALL_DATUM(_C_LABEL(_getcontext), 1b)
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.L_setcontext: CALL_DATUM(_C_LABEL(setcontext), 2b)
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SET_ENTRY_SIZE(swapcontext)
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