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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> |
6982d6d7 | 11 | * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
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" { | |
67ecffc0 | 37 | #endif |
36bc70a8 | 38 | |
6ee8df54 MD |
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 */ |
6ee8df54 MD |
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)) |
6ee8df54 MD |
60 | #define MEMOP_REF(op) "0(" #op ")" /* op refer to MEMOP_IN operand */ |
61 | ||
62 | #endif /* !COMPILER_HAVE_SHORT_MEM_OPERAND */ | |
63 | ||
03155c0d | 64 | /* |
dcae1b08 | 65 | * The __hp() macro casts the void pointer @x to a pointer to a structure |
03155c0d MD |
66 | * containing an array of char of the specified size. This allows passing the |
67 | * @addr arguments of the following inline functions as "m" and "+m" operands | |
dcae1b08 MD |
68 | * to the assembly. The @size parameter should be a constant to support |
69 | * compilers such as clang which do not support VLA. | |
03155c0d MD |
70 | */ |
71 | ||
72 | #define __hp(size, x) ((struct { char v[size]; } *)(x)) | |
53b8ed68 | 73 | |
9c697e4d | 74 | /* xchg */ |
f64acda4 MD |
75 | |
76 | static inline __attribute__((always_inline)) | |
ec4e58a3 | 77 | unsigned long _uatomic_exchange(volatile void *addr, unsigned long val, int len) |
ac26f1a8 JB |
78 | { |
79 | switch (len) { | |
80 | case 4: | |
2837ec40 | 81 | { |
9c697e4d MD |
82 | unsigned int old_val; |
83 | ||
84 | __asm__ __volatile__( | |
6ee8df54 | 85 | "0: cs %0,%2," MEMOP_REF(%3) "\n" |
9c697e4d | 86 | " brc 4,0b\n" |
dcae1b08 MD |
87 | : "=&r" (old_val), MEMOP_OUT (__hp(4, addr)) |
88 | : "r" (val), MEMOP_IN (__hp(4, addr)) | |
9c697e4d | 89 | : "memory", "cc"); |
1cf421dc | 90 | return old_val; |
2837ec40 | 91 | } |
b39e1761 | 92 | #if (CAA_BITS_PER_LONG == 64) |
ac26f1a8 | 93 | case 8: |
2837ec40 | 94 | { |
9c697e4d MD |
95 | unsigned long old_val; |
96 | ||
97 | __asm__ __volatile__( | |
6ee8df54 | 98 | "0: csg %0,%2," MEMOP_REF(%3) "\n" |
9c697e4d | 99 | " brc 4,0b\n" |
dcae1b08 MD |
100 | : "=&r" (old_val), MEMOP_OUT (__hp(8, addr)) |
101 | : "r" (val), MEMOP_IN (__hp(8, addr)) | |
9c697e4d | 102 | : "memory", "cc"); |
1cf421dc | 103 | return old_val; |
2837ec40 | 104 | } |
ac26f1a8 JB |
105 | #endif |
106 | default: | |
107 | __asm__ __volatile__(".long 0xd00d00"); | |
108 | } | |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
9c697e4d | 113 | #define uatomic_xchg(addr, v) \ |
e56d99bf MD |
114 | (__typeof__(*(addr))) _uatomic_exchange((addr), \ |
115 | caa_cast_long_keep_sign(v), \ | |
116 | sizeof(*(addr))) | |
ac26f1a8 | 117 | |
9c697e4d | 118 | /* cmpxchg */ |
8af57509 JB |
119 | |
120 | static inline __attribute__((always_inline)) | |
9c697e4d | 121 | unsigned long _uatomic_cmpxchg(void *addr, unsigned long old, |
1cf421dc | 122 | unsigned long _new, int len) |
8af57509 JB |
123 | { |
124 | switch (len) { | |
125 | case 4: | |
2837ec40 | 126 | { |
9c697e4d MD |
127 | unsigned int old_val = (unsigned int)old; |
128 | ||
129 | __asm__ __volatile__( | |
6ee8df54 | 130 | " cs %0,%2," MEMOP_REF(%3) "\n" |
dcae1b08 MD |
131 | : "+r" (old_val), MEMOP_OUT (__hp(4, addr)) |
132 | : "r" (_new), MEMOP_IN (__hp(4, addr)) | |
9c697e4d MD |
133 | : "memory", "cc"); |
134 | return old_val; | |
2837ec40 | 135 | } |
b39e1761 | 136 | #if (CAA_BITS_PER_LONG == 64) |
8af57509 | 137 | case 8: |
f64acda4 | 138 | { |
9c697e4d | 139 | __asm__ __volatile__( |
6ee8df54 | 140 | " csg %0,%2," MEMOP_REF(%3) "\n" |
dcae1b08 MD |
141 | : "+r" (old), MEMOP_OUT (__hp(8, addr)) |
142 | : "r" (_new), MEMOP_IN (__hp(8, addr)) | |
9c697e4d MD |
143 | : "memory", "cc"); |
144 | return old; | |
f64acda4 | 145 | } |
8af57509 JB |
146 | #endif |
147 | default: | |
148 | __asm__ __volatile__(".long 0xd00d00"); | |
149 | } | |
150 | ||
9c697e4d | 151 | return 0; |
8af57509 JB |
152 | } |
153 | ||
e56d99bf MD |
154 | #define uatomic_cmpxchg(addr, old, _new) \ |
155 | (__typeof__(*(addr))) _uatomic_cmpxchg((addr), \ | |
156 | caa_cast_long_keep_sign(old), \ | |
157 | caa_cast_long_keep_sign(_new),\ | |
9c697e4d | 158 | sizeof(*(addr))) |
8af57509 | 159 | |
67ecffc0 | 160 | #ifdef __cplusplus |
36bc70a8 MD |
161 | } |
162 | #endif | |
163 | ||
a2e7bf9c | 164 | #include <urcu/uatomic/generic.h> |
8760d94e | 165 | |
9c697e4d | 166 | #endif /* _URCU_UATOMIC_ARCH_S390_H */ |