pthreads/lock.s

   1 /*
   2  * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * Copyright 1996 1995 by Open Software Foundation, Inc. 1997 1996 1995 1994 1993 1992 1991
  25  *              All Rights Reserved
  26  *
  27  * Permission to use, copy, modify, and distribute this software and
  28  * its documentation for any purpose and without fee is hereby granted,
  29  * provided that the above copyright notice appears in all copies and
  30  * that both the copyright notice and this permission notice appear in
  31  * supporting documentation.
  32  *
  33  * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
  34  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  35  * FOR A PARTICULAR PURPOSE.
  36  *
  37  * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
  38  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  39  * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
  40  * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
  41  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  42  *
  43  */
  44
  45 #define __APPLE_API_PRIVATE
  46 #include <machine/cpu_capabilities.h>
  47 #undef  __APPLE_API_PRIVATE
  48
  49 #if defined(__ppc__)
  50
  51 #import <architecture/ppc/asm_help.h>
  52 #import <architecture/ppc/pseudo_inst.h>
  53
  54 /* void spin_lock(int *p);
  55  *
  56  * Lock the lock pointed to by `p'.  Spin (possibly forever) until
  57  * the lock is available.  Test and test and set logic used.
  58  * These routines have moved to the comm page.
  59  */
  60
  61 .text
  62 .align 2
  63 LEAF(__spin_lock_try)
  64     ba          _COMM_PAGE_SPINLOCK_TRY
  65 END(__spin_lock_try)
  66
  67 .globl _spin_lock
  68 LEAF(__spin_lock)
  69 _spin_lock:
  70     ba          _COMM_PAGE_SPINLOCK_LOCK
  71 END(__spin_lock)
  72
  73 /* void spin_unlock(int *p);
  74  *
  75  *      Unlock the lock pointed to by p.
  76  */
  77 .globl _spin_unlock
  78 LEAF(__spin_unlock)
  79 _spin_unlock:
  80     ba          _COMM_PAGE_SPINLOCK_UNLOCK
  81 END(__spin_unlock)
  82
  83 #elif defined(__i386__)
  84
  85 #include <architecture/i386/asm_help.h>
  86
  87 /*
  88  * void
  89  * _spin_lock(p)
  90  *      int *p;
  91  *
  92  * Lock the lock pointed to by p.  Spin (possibly forever) until the next
  93  * lock is available.
  94  */
  95         TEXT
  96         ALIGN
  97
  98 .globl _spin_lock_try
  99 LEAF(__spin_lock_try, 0)
 100 _spin_lock_try:
 101         movl    $(_COMM_PAGE_SPINLOCK_TRY), %eax
 102         jmpl    %eax
 103
 104         ALIGN
 105
 106 .globl _spin_lock
 107 LEAF(__spin_lock, 0)
 108 _spin_lock:
 109         movl    $(_COMM_PAGE_SPINLOCK_LOCK), %eax
 110         jmpl    %eax
 111
 112 /*
 113  * void
 114  * _spin_unlock(p)
 115  *      int *p;
 116  *
 117  * Unlock the lock pointed to by p.
 118  */
 119         ALIGN
 120
 121 .globl _spin_unlock
 122 LEAF(__spin_unlock, 0)
 123 _spin_unlock:
 124         movl    $(_COMM_PAGE_SPINLOCK_UNLOCK), %eax
 125         jmpl    %eax
 126
 127 #else
 128 #error spin_locks not defined for this architecture
 129 #endif