1 /*
2 Copyright (C) 2004-2008 Grame
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU Lesser General Public License as published by
6 the Free Software Foundation; either version 2.1 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17
18 */
19
20 #ifndef __JackAtomic_APPLE__
21 #define __JackAtomic_APPLE__
22
23 #include "JackTypes.h"
24
25 #if defined(__ppc__) || defined(__ppc64__)
26
CAS(register UInt32 value,register UInt32 newvalue,register volatile void * addr)27 static inline int CAS(register UInt32 value, register UInt32 newvalue, register volatile void* addr)
28 {
29 register int result;
30 asm volatile (
31 "# CAS \n"
32 " lwarx r0, 0, %1 \n" // creates a reservation on addr
33 " cmpw r0, %2 \n" // test value at addr
34 " bne- 1f \n"
35 " sync \n" // synchronize instructions
36 " stwcx. %3, 0, %1 \n" // if the reservation is not altered
37 // stores the new value at addr
38 " bne- 1f \n"
39 " li %0, 1 \n"
40 " b 2f \n"
41 "1: \n"
42 " li %0, 0 \n"
43 "2: \n"
44 : "=r" (result)
45 : "r" (addr), "r" (value), "r" (newvalue)
46 : "r0"
47 );
48 return result;
49 }
50
51 #endif
52
53 #if defined(__i386__) || defined(__x86_64__)
54
55 #define LOCK "lock ; "
56
CAS(volatile UInt32 value,UInt32 newvalue,volatile void * addr)57 static inline char CAS(volatile UInt32 value, UInt32 newvalue, volatile void* addr)
58 {
59 register char ret;
60 __asm__ __volatile__ (
61 "# CAS \n\t"
62 LOCK "cmpxchg %2, (%1) \n\t"
63 "sete %0 \n\t"
64 : "=a" (ret)
65 : "c" (addr), "d" (newvalue), "a" (value)
66 );
67 return ret;
68 }
69
70 #endif
71
72 #endif
73
74