minix/lib/nbsd_libc/arch/x86_64/gen/swapcontext.S
Gianluca Guida b6cbf7203b Import unmodified NetBSD libc in trunk
This patch imports the unmodified current version of NetBSD libc.
The NetBSD includes are in /nbsd_include, while the libc code itself is 
split between lib/nbsd_libc and common/lib/libc.
2011-02-14 19:36:03 +00:00

73 lines
2.5 KiB
ArmAsm

/* $NetBSD: swapcontext.S,v 1.4 2007/04/12 12:33:26 pooka Exp $ */
/*
* Copyright (c) 2003 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Frank van der Linden for Wasabi Systems, Inc.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
* 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 <machine/asm.h>
#if defined(LIBC_SCCS) && !defined(lint)
RCSID("$NetBSD: swapcontext.S,v 1.4 2007/04/12 12:33:26 pooka Exp $")
#endif /* LIBC_SCCS && !lint */
/*
* 56 == offsetof(ucontext_t, uc_mcontext)
* 21 == _REG_RIP
* 24 == _REG_URSP
*/
ENTRY(swapcontext)
pushq %rdi /* preserve oucp */
pushq %rsi /* preserve ucp */
#ifdef PIC
call PIC_PLT(_C_LABEL(_getcontext))
#else
call _C_LABEL(_getcontext)
#endif
popq %rsi
popq %rdi
testl %eax,%eax
jnz 2f
movq 0(%rsp),%r11
movq %r11,(56 + 21 * 8)(%rdi)
leaq 8(%rsp),%r11
movq %r11,(56 + 24 * 8)(%rdi)
movq %rsi,%rdi
#ifdef PIC
call PIC_PLT(_C_LABEL(setcontext))
#else
call _C_LABEL(setcontext)
#endif
2:
ret