Commit | Line | Data |
---|---|---|
9c697e4d MD |
1 | #ifndef _URCU_UATOMIC_ARCH_S390_H |
2 | #define _URCU_UATOMIC_ARCH_S390_H | |
ac26f1a8 JB |
3 | |
4 | /* | |
7039fa6f JB |
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> |
9c697e4d | 11 | * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> |
ac26f1a8 | 12 | * |
7039fa6f JB |
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 | * |
7039fa6f JB |
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. | |
ac26f1a8 JB |
30 | */ |
31 | ||
b46b23cb MD |
32 | #include <urcu/compiler.h> |
33 | #include <urcu/system.h> | |
34 | ||
36bc70a8 MD |
35 | #ifdef __cplusplus |
36 | extern "C" { | |
37 | #endif | |
38 | ||
ac26f1a8 JB |
39 | #ifndef __SIZEOF_LONG__ |
40 | #ifdef __s390x__ | |
41 | #define __SIZEOF_LONG__ 8 | |
42 | #else | |
43 | #define __SIZEOF_LONG__ 4 | |
44 | #endif | |
45 | #endif | |
46 | ||
47 | #ifndef BITS_PER_LONG | |
48 | #define BITS_PER_LONG (__SIZEOF_LONG__ * 8) | |
49 | #endif | |
50 | ||
6ee8df54 MD |
51 | #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2) |
52 | #define COMPILER_HAVE_SHORT_MEM_OPERAND | |
53 | #endif | |
54 | ||
55 | /* | |
56 | * MEMOP assembler operand rules: | |
57 | * - op refer to MEMOP_IN operand | |
58 | * - MEMOP_IN can expand to more than a single operand. Use it at the end of | |
59 | * operand list only. | |
60 | */ | |
61 | ||
62 | #ifdef COMPILER_HAVE_SHORT_MEM_OPERAND | |
63 | ||
64 | #define MEMOP_OUT(addr) "=Q" (*(addr)) | |
a44291d8 | 65 | #define MEMOP_IN(addr) "Q" (*(addr)) |
0cdbb97c | 66 | #define MEMOP_REF(op) #op /* op refer to MEMOP_IN operand */ |
6ee8df54 MD |
67 | |
68 | #else /* !COMPILER_HAVE_SHORT_MEM_OPERAND */ | |
69 | ||
70 | #define MEMOP_OUT(addr) "=m" (*(addr)) | |
a44291d8 | 71 | #define MEMOP_IN(addr) "a" (addr), "m" (*(addr)) |
6ee8df54 MD |
72 | #define MEMOP_REF(op) "0(" #op ")" /* op refer to MEMOP_IN operand */ |
73 | ||
74 | #endif /* !COMPILER_HAVE_SHORT_MEM_OPERAND */ | |
75 | ||
53b8ed68 MD |
76 | struct __uatomic_dummy { |
77 | unsigned long v[10]; | |
78 | }; | |
79 | #define __hp(x) ((struct __uatomic_dummy *)(x)) | |
80 | ||
9c697e4d | 81 | /* xchg */ |
f64acda4 MD |
82 | |
83 | static inline __attribute__((always_inline)) | |
ec4e58a3 | 84 | unsigned long _uatomic_exchange(volatile void *addr, unsigned long val, int len) |
ac26f1a8 JB |
85 | { |
86 | switch (len) { | |
87 | case 4: | |
2837ec40 | 88 | { |
9c697e4d MD |
89 | unsigned int old_val; |
90 | ||
91 | __asm__ __volatile__( | |
6ee8df54 | 92 | "0: cs %0,%2," MEMOP_REF(%3) "\n" |
9c697e4d | 93 | " brc 4,0b\n" |
53b8ed68 MD |
94 | : "=&r" (old_val), MEMOP_OUT (__hp(addr)) |
95 | : "r" (val), MEMOP_IN (__hp(addr)) | |
9c697e4d | 96 | : "memory", "cc"); |
1cf421dc | 97 | return old_val; |
2837ec40 | 98 | } |
ac26f1a8 JB |
99 | #if (BITS_PER_LONG == 64) |
100 | case 8: | |
2837ec40 | 101 | { |
9c697e4d MD |
102 | unsigned long old_val; |
103 | ||
104 | __asm__ __volatile__( | |
6ee8df54 | 105 | "0: csg %0,%2," MEMOP_REF(%3) "\n" |
9c697e4d | 106 | " brc 4,0b\n" |
53b8ed68 MD |
107 | : "=&r" (old_val), MEMOP_OUT (__hp(addr)) |
108 | : "r" (val), MEMOP_IN (__hp(addr)) | |
9c697e4d | 109 | : "memory", "cc"); |
1cf421dc | 110 | return old_val; |
2837ec40 | 111 | } |
ac26f1a8 JB |
112 | #endif |
113 | default: | |
114 | __asm__ __volatile__(".long 0xd00d00"); | |
115 | } | |
116 | ||
117 | return 0; | |
118 | } | |
119 | ||
9c697e4d | 120 | #define uatomic_xchg(addr, v) \ |
ec4e58a3 | 121 | (__typeof__(*(addr))) _uatomic_exchange((addr), (unsigned long)(v), \ |
a9a05d42 | 122 | sizeof(*(addr))) |
ac26f1a8 | 123 | |
9c697e4d | 124 | /* cmpxchg */ |
8af57509 JB |
125 | |
126 | static inline __attribute__((always_inline)) | |
9c697e4d | 127 | unsigned long _uatomic_cmpxchg(void *addr, unsigned long old, |
1cf421dc | 128 | unsigned long _new, int len) |
8af57509 JB |
129 | { |
130 | switch (len) { | |
131 | case 4: | |
2837ec40 | 132 | { |
9c697e4d MD |
133 | unsigned int old_val = (unsigned int)old; |
134 | ||
135 | __asm__ __volatile__( | |
6ee8df54 | 136 | " cs %0,%2," MEMOP_REF(%3) "\n" |
53b8ed68 MD |
137 | : "+r" (old_val), MEMOP_OUT (__hp(addr)) |
138 | : "r" (_new), MEMOP_IN (__hp(addr)) | |
9c697e4d MD |
139 | : "memory", "cc"); |
140 | return old_val; | |
2837ec40 | 141 | } |
8af57509 JB |
142 | #if (BITS_PER_LONG == 64) |
143 | case 8: | |
f64acda4 | 144 | { |
9c697e4d | 145 | __asm__ __volatile__( |
6ee8df54 | 146 | " csg %0,%2," MEMOP_REF(%3) "\n" |
53b8ed68 MD |
147 | : "+r" (old), MEMOP_OUT (__hp(addr)) |
148 | : "r" (_new), MEMOP_IN (__hp(addr)) | |
9c697e4d MD |
149 | : "memory", "cc"); |
150 | return old; | |
f64acda4 | 151 | } |
8af57509 JB |
152 | #endif |
153 | default: | |
154 | __asm__ __volatile__(".long 0xd00d00"); | |
155 | } | |
156 | ||
9c697e4d | 157 | return 0; |
8af57509 JB |
158 | } |
159 | ||
1cf421dc | 160 | #define uatomic_cmpxchg(addr, old, _new) \ |
9c697e4d MD |
161 | (__typeof__(*(addr))) _uatomic_cmpxchg((addr), \ |
162 | (unsigned long)(old), \ | |
1cf421dc | 163 | (unsigned long)(_new), \ |
9c697e4d | 164 | sizeof(*(addr))) |
8af57509 | 165 | |
36bc70a8 MD |
166 | #ifdef __cplusplus |
167 | } | |
168 | #endif | |
169 | ||
8760d94e PB |
170 | #include <urcu/uatomic_generic.h> |
171 | ||
9c697e4d | 172 | #endif /* _URCU_UATOMIC_ARCH_S390_H */ |