Cleanup: remove trailing whitespaces at EOL
[urcu.git] / urcu / uatomic / s390.h
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1#ifndef _URCU_UATOMIC_ARCH_S390_H
2#define _URCU_UATOMIC_ARCH_S390_H
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3
4/*
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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)".
ac26f1a8 8 *
7039fa6f 9 * Copyright (c) 2009 Novell, Inc.
ac26f1a8 10 * Author: Jan Blunck <jblunck@suse.de>
6982d6d7 11 * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
ac26f1a8 12 *
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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:
ac26f1a8 19 *
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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.
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30 */
31
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32#include <urcu/compiler.h>
33#include <urcu/system.h>
34
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35#ifdef __cplusplus
36extern "C" {
67ecffc0 37#endif
36bc70a8 38
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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))
a44291d8 53#define MEMOP_IN(addr) "Q" (*(addr))
0cdbb97c 54#define MEMOP_REF(op) #op /* op refer to MEMOP_IN operand */
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55
56#else /* !COMPILER_HAVE_SHORT_MEM_OPERAND */
57
58#define MEMOP_OUT(addr) "=m" (*(addr))
a44291d8 59#define MEMOP_IN(addr) "a" (addr), "m" (*(addr))
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60#define MEMOP_REF(op) "0(" #op ")" /* op refer to MEMOP_IN operand */
61
62#endif /* !COMPILER_HAVE_SHORT_MEM_OPERAND */
63
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64struct __uatomic_dummy {
65 unsigned long v[10];
66};
67#define __hp(x) ((struct __uatomic_dummy *)(x))
68
9c697e4d 69/* xchg */
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70
71static inline __attribute__((always_inline))
ec4e58a3 72unsigned long _uatomic_exchange(volatile void *addr, unsigned long val, int len)
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73{
74 switch (len) {
75 case 4:
2837ec40 76 {
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77 unsigned int old_val;
78
79 __asm__ __volatile__(
6ee8df54 80 "0: cs %0,%2," MEMOP_REF(%3) "\n"
9c697e4d 81 " brc 4,0b\n"
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82 : "=&r" (old_val), MEMOP_OUT (__hp(addr))
83 : "r" (val), MEMOP_IN (__hp(addr))
9c697e4d 84 : "memory", "cc");
1cf421dc 85 return old_val;
2837ec40 86 }
b39e1761 87#if (CAA_BITS_PER_LONG == 64)
ac26f1a8 88 case 8:
2837ec40 89 {
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90 unsigned long old_val;
91
92 __asm__ __volatile__(
6ee8df54 93 "0: csg %0,%2," MEMOP_REF(%3) "\n"
9c697e4d 94 " brc 4,0b\n"
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95 : "=&r" (old_val), MEMOP_OUT (__hp(addr))
96 : "r" (val), MEMOP_IN (__hp(addr))
9c697e4d 97 : "memory", "cc");
1cf421dc 98 return old_val;
2837ec40 99 }
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100#endif
101 default:
102 __asm__ __volatile__(".long 0xd00d00");
103 }
104
105 return 0;
106}
107
9c697e4d 108#define uatomic_xchg(addr, v) \
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109 (__typeof__(*(addr))) _uatomic_exchange((addr), \
110 caa_cast_long_keep_sign(v), \
111 sizeof(*(addr)))
ac26f1a8 112
9c697e4d 113/* cmpxchg */
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114
115static inline __attribute__((always_inline))
9c697e4d 116unsigned long _uatomic_cmpxchg(void *addr, unsigned long old,
1cf421dc 117 unsigned long _new, int len)
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118{
119 switch (len) {
120 case 4:
2837ec40 121 {
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122 unsigned int old_val = (unsigned int)old;
123
124 __asm__ __volatile__(
6ee8df54 125 " cs %0,%2," MEMOP_REF(%3) "\n"
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126 : "+r" (old_val), MEMOP_OUT (__hp(addr))
127 : "r" (_new), MEMOP_IN (__hp(addr))
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128 : "memory", "cc");
129 return old_val;
2837ec40 130 }
b39e1761 131#if (CAA_BITS_PER_LONG == 64)
8af57509 132 case 8:
f64acda4 133 {
9c697e4d 134 __asm__ __volatile__(
6ee8df54 135 " csg %0,%2," MEMOP_REF(%3) "\n"
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136 : "+r" (old), MEMOP_OUT (__hp(addr))
137 : "r" (_new), MEMOP_IN (__hp(addr))
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138 : "memory", "cc");
139 return old;
f64acda4 140 }
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141#endif
142 default:
143 __asm__ __volatile__(".long 0xd00d00");
144 }
145
9c697e4d 146 return 0;
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147}
148
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149#define uatomic_cmpxchg(addr, old, _new) \
150 (__typeof__(*(addr))) _uatomic_cmpxchg((addr), \
151 caa_cast_long_keep_sign(old), \
152 caa_cast_long_keep_sign(_new),\
9c697e4d 153 sizeof(*(addr)))
8af57509 154
67ecffc0 155#ifdef __cplusplus
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156}
157#endif
158
a2e7bf9c 159#include <urcu/uatomic/generic.h>
8760d94e 160
9c697e4d 161#endif /* _URCU_UATOMIC_ARCH_S390_H */
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