add uatomic_generic.h, use it for common definitions
[urcu.git] / urcu / uatomic_arch_sparc64.h
1 #ifndef _URCU_ARCH_UATOMIC_SPARC64_H
2 #define _URCU_ARCH_UATOMIC_SPARC64_H
3
4 /*
5 * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
6 * Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved.
7 * Copyright (c) 1999-2003 by Hewlett-Packard Company. All rights reserved.
8 * Copyright (c) 2009 Mathieu Desnoyers
9 *
10 * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
11 * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
12 *
13 * Permission is hereby granted to use or copy this program
14 * for any purpose, provided the above notices are retained on all copies.
15 * Permission to modify the code and to distribute modified code is granted,
16 * provided the above notices are retained, and a notice that the code was
17 * modified is included with the above copyright notice.
18 *
19 * Code inspired from libuatomic_ops-1.2, inherited in part from the
20 * Boehm-Demers-Weiser conservative garbage collector.
21 */
22
23 #include <urcu/compiler.h>
24 #include <urcu/system.h>
25
26 #ifdef __cplusplus
27 extern "C" {
28 #endif
29
30 #ifndef __SIZEOF_LONG__
31 #ifdef __LP64__
32 #define __SIZEOF_LONG__ 8
33 #else
34 #define __SIZEOF_LONG__ 4
35 #endif
36 #endif
37
38 #ifndef BITS_PER_LONG
39 #define BITS_PER_LONG (__SIZEOF_LONG__ * 8)
40 #endif
41
42 /* cmpxchg */
43
44 static inline __attribute__((always_inline))
45 unsigned long _uatomic_cmpxchg(void *addr, unsigned long old,
46 unsigned long _new, int len)
47 {
48 switch (len) {
49 case 4:
50 {
51 __asm__ __volatile__ (
52 "membar #StoreLoad | #LoadLoad\n\t"
53 "cas [%1],%2,%0\n\t"
54 "membar #StoreLoad | #StoreStore\n\t"
55 : "+&r" (_new)
56 : "r" (addr), "r" (old)
57 : "memory");
58
59 return _new;
60 }
61 #if (BITS_PER_LONG == 64)
62 case 8:
63 {
64 __asm__ __volatile__ (
65 "membar #StoreLoad | #LoadLoad\n\t"
66 "casx [%1],%2,%0\n\t"
67 "membar #StoreLoad | #StoreStore\n\t"
68 : "+&r" (_new)
69 : "r" (addr), "r" (old)
70 : "memory");
71
72 return _new;
73 }
74 #endif
75 }
76 __builtin_trap();
77 return 0;
78 }
79
80
81 #define uatomic_cmpxchg(addr, old, _new) \
82 ((__typeof__(*(addr))) _uatomic_cmpxchg((addr), (unsigned long)(old),\
83 (unsigned long)(_new), \
84 sizeof(*(addr))))
85
86 /* xchg */
87
88 static inline __attribute__((always_inline))
89 unsigned long _uatomic_exchange(void *addr, unsigned long val, int len)
90 {
91 switch (len) {
92 case 4:
93 {
94 unsigned int old, oldt;
95
96 oldt = uatomic_read((unsigned int *)addr);
97 do {
98 old = oldt;
99 oldt = _uatomic_cmpxchg(addr, old, val, 4);
100 } while (oldt != old);
101
102 return old;
103 }
104 #if (BITS_PER_LONG == 64)
105 case 8:
106 {
107 unsigned long old, oldt;
108
109 oldt = uatomic_read((unsigned long *)addr);
110 do {
111 old = oldt;
112 oldt = _uatomic_cmpxchg(addr, old, val, 8);
113 } while (oldt != old);
114
115 return old;
116 }
117 #endif
118 }
119 __builtin_trap();
120 return 0;
121 }
122
123 #define uatomic_xchg(addr, v) \
124 ((__typeof__(*(addr))) _uatomic_exchange((addr), (unsigned long)(v), \
125 sizeof(*(addr))))
126
127 /* uatomic_add_return */
128
129 static inline __attribute__((always_inline))
130 unsigned long _uatomic_add_return(void *addr, unsigned long val, int len)
131 {
132 switch (len) {
133 case 4:
134 {
135 unsigned int old, oldt;
136
137 oldt = uatomic_read((unsigned int *)addr);
138 do {
139 old = oldt;
140 oldt = _uatomic_cmpxchg(addr, old, old + val, 4);
141 } while (oldt != old);
142
143 return old + val;
144 }
145 #if (BITS_PER_LONG == 64)
146 case 8:
147 {
148 unsigned long old, oldt;
149
150 oldt = uatomic_read((unsigned long *)addr);
151 do {
152 old = oldt;
153 oldt = _uatomic_cmpxchg(addr, old, old + val, 8);
154 } while (oldt != old);
155
156 return old + val;
157 }
158 #endif
159 }
160 __builtin_trap();
161 return 0;
162 }
163
164 #define uatomic_add_return(addr, v) \
165 ((__typeof__(*(addr))) _uatomic_add_return((addr), \
166 (unsigned long)(v), \
167 sizeof(*(addr))))
168
169 #ifdef __cplusplus
170 }
171 #endif
172
173 #include <urcu/uatomic_generic.h>
174
175 #endif /* _URCU_ARCH_UATOMIC_PPC_H */
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