libkern/x86_64/OSAtomic.s

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_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. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 #;***************************************************************************
  30 #;* Boolean OSCompareAndSwap(SInt32 oldValue, SInt32 newValue, SInt32 *ptr) *
  31 #;***************************************************************************
  32
  33         .globl _OSCompareAndSwap
  34 _OSCompareAndSwap: #;oldValue, newValue, ptr
  35 #if     DEBUG
  36         test    $3, %rdx
  37         jz      1f
  38         ud2
  39 1:
  40 #endif
  41         movl             %edi, %eax
  42         lock
  43         cmpxchgl        %esi, (%rdx)    #; CAS (eax is an implicit operand)
  44         sete            %al                     #; did CAS succeed? (TZ=1)
  45         movzbq          %al, %rax               #; clear out the high bytes
  46         ret
  47
  48 #;*****************************************************************************
  49 #;* Boolean OSCompareAndSwap64(SInt64 oldValue, SInt64 newValue, SInt64 *ptr) *
  50 #;*****************************************************************************
  51
  52         .globl _OSCompareAndSwap64
  53         .globl _OSCompareAndSwapPtr
  54
  55 _OSCompareAndSwap64:
  56 _OSCompareAndSwapPtr: #;oldValue, newValue, ptr
  57 #if     DEBUG
  58         test    $7, %rdx
  59         jz      1f
  60         ud2
  61 1:
  62 #endif
  63         movq            %rdi, %rax
  64         lock
  65         cmpxchgq        %rsi, (%rdx)    #; CAS (rax is an implicit operand)
  66         sete            %al                     #; did CAS succeed? (TZ=1)
  67         movzbq          %al, %rax               #; clear out the high bytes
  68         ret
  69
  70 #;*******************************************************
  71 #;* SInt64 OSAddAtomic64(SInt64 theAmount, SInt64 *ptr) *
  72 #;*******************************************************
  73
  74         .globl  _OSAddAtomicLong
  75         .globl  _OSAddAtomic64
  76 _OSAddAtomic64:
  77 _OSAddAtomicLong:
  78 #if     DEBUG
  79         test    $7, %rsi
  80         jz      1f
  81         ud2
  82 1:
  83 #endif
  84         lock
  85         xaddq   %rdi, (%rsi)            #; Atomic exchange and add
  86         movq    %rdi, %rax;
  87         ret
  88
  89
  90 #;*******************************************************
  91 #; SInt32 OSAddAtomic(SInt32 delta, SInt32 *address)
  92 #;*******************************************************
  93
  94         .globl  _OSAddAtomic
  95 _OSAddAtomic:
  96 #if     DEBUG
  97         test    $3, %rsi
  98         jz      1f
  99         ud2
 100 1:
 101 #endif
 102         lock
 103         xaddl   %edi, (%rsi)            #; Atomic exchange and add
 104         movl    %edi, %eax;
 105         ret