2013-12-06 12:04:52 +01:00
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/* $NetBSD: swapcontext.S,v 1.5 2013/09/12 15:36:16 joerg Exp $ */
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2011-02-14 20:36:03 +01:00
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/*
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* Copyright (c) 2003 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Frank van der Linden for Wasabi Systems, Inc.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* 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 WASABI SYSTEMS, INC
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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(LIBC_SCCS) && !defined(lint)
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2013-12-06 12:04:52 +01:00
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RCSID("$NetBSD: swapcontext.S,v 1.5 2013/09/12 15:36:16 joerg Exp $")
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2011-02-14 20:36:03 +01:00
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#endif /* LIBC_SCCS && !lint */
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/*
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* 56 == offsetof(ucontext_t, uc_mcontext)
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* 21 == _REG_RIP
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* 24 == _REG_URSP
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*/
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ENTRY(swapcontext)
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pushq %rdi /* preserve oucp */
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pushq %rsi /* preserve ucp */
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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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call PIC_PLT(_C_LABEL(_getcontext))
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#else
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call _C_LABEL(_getcontext)
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#endif
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popq %rsi
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popq %rdi
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testl %eax,%eax
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jnz 2f
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movq 0(%rsp),%r11
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movq %r11,(56 + 21 * 8)(%rdi)
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leaq 8(%rsp),%r11
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movq %r11,(56 + 24 * 8)(%rdi)
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movq %rsi,%rdi
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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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call PIC_PLT(_C_LABEL(setcontext))
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#else
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call _C_LABEL(setcontext)
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#endif
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2:
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ret
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