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d3d3857f MJ |
1 | // SPDX-FileCopyrightText: 2009 Novell, Inc. |
2 | // SPDX-FileCopyrightText: 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
3 | // | |
4 | // SPDX-License-Identifier: MIT | |
5 | ||
9c697e4d MD |
6 | #ifndef _URCU_UATOMIC_ARCH_S390_H |
7 | #define _URCU_UATOMIC_ARCH_S390_H | |
ac26f1a8 JB |
8 | |
9 | /* | |
7039fa6f JB |
10 | * Atomic exchange operations for the S390 architecture. Based on information |
11 | * taken from the Principles of Operation Appendix A "Conditional Swapping | |
12 | * Instructions (CS, CDS)". | |
ac26f1a8 | 13 | * |
ac26f1a8 | 14 | * Author: Jan Blunck <jblunck@suse.de> |
ac26f1a8 JB |
15 | */ |
16 | ||
b46b23cb MD |
17 | #include <urcu/compiler.h> |
18 | #include <urcu/system.h> | |
19 | ||
36bc70a8 MD |
20 | #ifdef __cplusplus |
21 | extern "C" { | |
67ecffc0 | 22 | #endif |
36bc70a8 | 23 | |
6ee8df54 MD |
24 | #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2) |
25 | #define COMPILER_HAVE_SHORT_MEM_OPERAND | |
26 | #endif | |
27 | ||
28 | /* | |
29 | * MEMOP assembler operand rules: | |
30 | * - op refer to MEMOP_IN operand | |
31 | * - MEMOP_IN can expand to more than a single operand. Use it at the end of | |
32 | * operand list only. | |
33 | */ | |
34 | ||
35 | #ifdef COMPILER_HAVE_SHORT_MEM_OPERAND | |
36 | ||
37 | #define MEMOP_OUT(addr) "=Q" (*(addr)) | |
a44291d8 | 38 | #define MEMOP_IN(addr) "Q" (*(addr)) |
0cdbb97c | 39 | #define MEMOP_REF(op) #op /* op refer to MEMOP_IN operand */ |
6ee8df54 MD |
40 | |
41 | #else /* !COMPILER_HAVE_SHORT_MEM_OPERAND */ | |
42 | ||
43 | #define MEMOP_OUT(addr) "=m" (*(addr)) | |
a44291d8 | 44 | #define MEMOP_IN(addr) "a" (addr), "m" (*(addr)) |
6ee8df54 MD |
45 | #define MEMOP_REF(op) "0(" #op ")" /* op refer to MEMOP_IN operand */ |
46 | ||
47 | #endif /* !COMPILER_HAVE_SHORT_MEM_OPERAND */ | |
48 | ||
835b9ab3 | 49 | /* |
71323499 | 50 | * The __hp() macro casts the void pointer @x to a pointer to a structure |
835b9ab3 MD |
51 | * containing an array of char of the specified size. This allows passing the |
52 | * @addr arguments of the following inline functions as "m" and "+m" operands | |
71323499 | 53 | * to the assembly. The @size parameter should be a constant to support |
13bf2f57 MD |
54 | * compilers such as clang which do not support VLA. Create typedefs because |
55 | * C++ does not allow types be defined in casts. | |
835b9ab3 MD |
56 | */ |
57 | ||
13bf2f57 MD |
58 | typedef struct { char v[4]; } __hp_4; |
59 | typedef struct { char v[8]; } __hp_8; | |
60 | ||
61 | #define __hp(size, x) ((__hp_##size *)(x)) | |
53b8ed68 | 62 | |
9c697e4d | 63 | /* xchg */ |
f64acda4 MD |
64 | |
65 | static inline __attribute__((always_inline)) | |
ec4e58a3 | 66 | unsigned long _uatomic_exchange(volatile void *addr, unsigned long val, int len) |
ac26f1a8 JB |
67 | { |
68 | switch (len) { | |
69 | case 4: | |
2837ec40 | 70 | { |
9c697e4d MD |
71 | unsigned int old_val; |
72 | ||
73 | __asm__ __volatile__( | |
6ee8df54 | 74 | "0: cs %0,%2," MEMOP_REF(%3) "\n" |
9c697e4d | 75 | " brc 4,0b\n" |
71323499 MD |
76 | : "=&r" (old_val), MEMOP_OUT (__hp(4, addr)) |
77 | : "r" (val), MEMOP_IN (__hp(4, addr)) | |
9c697e4d | 78 | : "memory", "cc"); |
1cf421dc | 79 | return old_val; |
2837ec40 | 80 | } |
b39e1761 | 81 | #if (CAA_BITS_PER_LONG == 64) |
ac26f1a8 | 82 | case 8: |
2837ec40 | 83 | { |
9c697e4d MD |
84 | unsigned long old_val; |
85 | ||
86 | __asm__ __volatile__( | |
6ee8df54 | 87 | "0: csg %0,%2," MEMOP_REF(%3) "\n" |
9c697e4d | 88 | " brc 4,0b\n" |
71323499 MD |
89 | : "=&r" (old_val), MEMOP_OUT (__hp(8, addr)) |
90 | : "r" (val), MEMOP_IN (__hp(8, addr)) | |
9c697e4d | 91 | : "memory", "cc"); |
1cf421dc | 92 | return old_val; |
2837ec40 | 93 | } |
ac26f1a8 JB |
94 | #endif |
95 | default: | |
96 | __asm__ __volatile__(".long 0xd00d00"); | |
97 | } | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
9c697e4d | 102 | #define uatomic_xchg(addr, v) \ |
e56d99bf MD |
103 | (__typeof__(*(addr))) _uatomic_exchange((addr), \ |
104 | caa_cast_long_keep_sign(v), \ | |
105 | sizeof(*(addr))) | |
ac26f1a8 | 106 | |
9c697e4d | 107 | /* cmpxchg */ |
8af57509 JB |
108 | |
109 | static inline __attribute__((always_inline)) | |
9c697e4d | 110 | unsigned long _uatomic_cmpxchg(void *addr, unsigned long old, |
1cf421dc | 111 | unsigned long _new, int len) |
8af57509 JB |
112 | { |
113 | switch (len) { | |
114 | case 4: | |
2837ec40 | 115 | { |
9c697e4d MD |
116 | unsigned int old_val = (unsigned int)old; |
117 | ||
118 | __asm__ __volatile__( | |
6ee8df54 | 119 | " cs %0,%2," MEMOP_REF(%3) "\n" |
71323499 MD |
120 | : "+r" (old_val), MEMOP_OUT (__hp(4, addr)) |
121 | : "r" (_new), MEMOP_IN (__hp(4, addr)) | |
9c697e4d MD |
122 | : "memory", "cc"); |
123 | return old_val; | |
2837ec40 | 124 | } |
b39e1761 | 125 | #if (CAA_BITS_PER_LONG == 64) |
8af57509 | 126 | case 8: |
f64acda4 | 127 | { |
9c697e4d | 128 | __asm__ __volatile__( |
6ee8df54 | 129 | " csg %0,%2," MEMOP_REF(%3) "\n" |
71323499 MD |
130 | : "+r" (old), MEMOP_OUT (__hp(8, addr)) |
131 | : "r" (_new), MEMOP_IN (__hp(8, addr)) | |
9c697e4d MD |
132 | : "memory", "cc"); |
133 | return old; | |
f64acda4 | 134 | } |
8af57509 JB |
135 | #endif |
136 | default: | |
137 | __asm__ __volatile__(".long 0xd00d00"); | |
138 | } | |
139 | ||
9c697e4d | 140 | return 0; |
8af57509 JB |
141 | } |
142 | ||
e56d99bf MD |
143 | #define uatomic_cmpxchg(addr, old, _new) \ |
144 | (__typeof__(*(addr))) _uatomic_cmpxchg((addr), \ | |
145 | caa_cast_long_keep_sign(old), \ | |
146 | caa_cast_long_keep_sign(_new),\ | |
9c697e4d | 147 | sizeof(*(addr))) |
8af57509 | 148 | |
67ecffc0 | 149 | #ifdef __cplusplus |
36bc70a8 MD |
150 | } |
151 | #endif | |
152 | ||
a2e7bf9c | 153 | #include <urcu/uatomic/generic.h> |
8760d94e | 154 | |
9c697e4d | 155 | #endif /* _URCU_UATOMIC_ARCH_S390_H */ |