56 lines
1.6 KiB
ArmAsm
56 lines
1.6 KiB
ArmAsm
|
/*
|
||
|
|
* Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>.
|
||
|
|
* All rights reserved.
|
||
|
|
* copyright Douglas Santry 1996
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the above copyright is retained
|
||
|
|
* in the source form.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY Douglas Santry 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 Douglas Santry 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.
|
||
|
|
*
|
||
|
|
* $Id$
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#if defined(LIBC_RCS) && !defined(lint)
|
||
|
|
.text
|
||
|
|
.asciz "$Id$"
|
||
|
|
#endif /* LIBC_RCS and not lint */
|
||
|
|
|
||
|
|
#include "DEFS.h"
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Atomicly lock a location with an identifier provided the location
|
||
|
|
* is not currently locked.
|
||
|
|
*
|
||
|
|
* long _atomic_lock(long *, long);
|
||
|
|
* eax will contain the return value.
|
||
|
|
*/
|
||
|
|
ENTRY(_atomic_lock)
|
||
|
|
movl 4(%esp), %ecx
|
||
|
|
movl 8(%esp), %eax
|
||
|
|
xchg %eax, (%ecx)
|
||
|
|
ret
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Unlock a location.
|
||
|
|
*
|
||
|
|
* long _atomic_unlock(long *);
|
||
|
|
*/
|
||
|
|
ENTRY(_atomic_unlock)
|
||
|
|
movl 4(%esp), %ecx
|
||
|
|
movl $0, %eax
|
||
|
|
xchg %eax, (%ecx)
|
||
|
|
ret
|