0a0f2381835542e16216421657de8b755f2b0e42
[urcu.git] / urcu / uatomic_arch_s390.h
1 #ifndef _URCU_UATOMIC_ARCH_S390_H
2 #define _URCU_UATOMIC_ARCH_S390_H
3
4 /*
5 * Atomic exchange operations for the S390 architecture. Based on information
6 * taken from the Principles of Operation Appendix A "Conditional Swapping
7 * Instructions (CS, CDS)".
8 *
9 * Copyright (c) 2009 Novell, Inc.
10 * Author: Jan Blunck <jblunck@suse.de>
11 * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
12 *
13 * Permission is hereby granted, free of charge, to any person obtaining a copy
14 * of this software and associated documentation files (the "Software"), to
15 * deal in the Software without restriction, including without limitation the
16 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
17 * sell copies of the Software, and to permit persons to whom the Software is
18 * furnished to do so, subject to the following conditions:
19 *
20 * The above copyright notice and this permission notice shall be included in
21 * all copies or substantial portions of the Software.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
24 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
25 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
26 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
27 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
28 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
29 * IN THE SOFTWARE.
30 */
31
32 #include <urcu/compiler.h>
33 #include <urcu/system.h>
34
35 #ifdef __cplusplus
36 extern "C" {
37 #endif
38
39 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
40 #define COMPILER_HAVE_SHORT_MEM_OPERAND
41 #endif
42
43 /*
44 * MEMOP assembler operand rules:
45 * - op refer to MEMOP_IN operand
46 * - MEMOP_IN can expand to more than a single operand. Use it at the end of
47 * operand list only.
48 */
49
50 #ifdef COMPILER_HAVE_SHORT_MEM_OPERAND
51
52 #define MEMOP_OUT(addr) "=Q" (*(addr))
53 #define MEMOP_IN(addr) "Q" (*(addr))
54 #define MEMOP_REF(op) #op /* op refer to MEMOP_IN operand */
55
56 #else /* !COMPILER_HAVE_SHORT_MEM_OPERAND */
57
58 #define MEMOP_OUT(addr) "=m" (*(addr))
59 #define MEMOP_IN(addr) "a" (addr), "m" (*(addr))
60 #define MEMOP_REF(op) "0(" #op ")" /* op refer to MEMOP_IN operand */
61
62 #endif /* !COMPILER_HAVE_SHORT_MEM_OPERAND */
63
64 struct __uatomic_dummy {
65 unsigned long v[10];
66 };
67 #define __hp(x) ((struct __uatomic_dummy *)(x))
68
69 /* xchg */
70
71 static inline __attribute__((always_inline))
72 unsigned long _uatomic_exchange(volatile void *addr, unsigned long val, int len)
73 {
74 switch (len) {
75 case 4:
76 {
77 unsigned int old_val;
78
79 __asm__ __volatile__(
80 "0: cs %0,%2," MEMOP_REF(%3) "\n"
81 " brc 4,0b\n"
82 : "=&r" (old_val), MEMOP_OUT (__hp(addr))
83 : "r" (val), MEMOP_IN (__hp(addr))
84 : "memory", "cc");
85 return old_val;
86 }
87 #if (BITS_PER_LONG == 64)
88 case 8:
89 {
90 unsigned long old_val;
91
92 __asm__ __volatile__(
93 "0: csg %0,%2," MEMOP_REF(%3) "\n"
94 " brc 4,0b\n"
95 : "=&r" (old_val), MEMOP_OUT (__hp(addr))
96 : "r" (val), MEMOP_IN (__hp(addr))
97 : "memory", "cc");
98 return old_val;
99 }
100 #endif
101 default:
102 __asm__ __volatile__(".long 0xd00d00");
103 }
104
105 return 0;
106 }
107
108 #define uatomic_xchg(addr, v) \
109 (__typeof__(*(addr))) _uatomic_exchange((addr), (unsigned long)(v), \
110 sizeof(*(addr)))
111
112 /* cmpxchg */
113
114 static inline __attribute__((always_inline))
115 unsigned long _uatomic_cmpxchg(void *addr, unsigned long old,
116 unsigned long _new, int len)
117 {
118 switch (len) {
119 case 4:
120 {
121 unsigned int old_val = (unsigned int)old;
122
123 __asm__ __volatile__(
124 " cs %0,%2," MEMOP_REF(%3) "\n"
125 : "+r" (old_val), MEMOP_OUT (__hp(addr))
126 : "r" (_new), MEMOP_IN (__hp(addr))
127 : "memory", "cc");
128 return old_val;
129 }
130 #if (BITS_PER_LONG == 64)
131 case 8:
132 {
133 __asm__ __volatile__(
134 " csg %0,%2," MEMOP_REF(%3) "\n"
135 : "+r" (old), MEMOP_OUT (__hp(addr))
136 : "r" (_new), MEMOP_IN (__hp(addr))
137 : "memory", "cc");
138 return old;
139 }
140 #endif
141 default:
142 __asm__ __volatile__(".long 0xd00d00");
143 }
144
145 return 0;
146 }
147
148 #define uatomic_cmpxchg(addr, old, _new) \
149 (__typeof__(*(addr))) _uatomic_cmpxchg((addr), \
150 (unsigned long)(old), \
151 (unsigned long)(_new), \
152 sizeof(*(addr)))
153
154 #ifdef __cplusplus
155 }
156 #endif
157
158 #include <urcu/uatomic_generic.h>
159
160 #endif /* _URCU_UATOMIC_ARCH_S390_H */
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