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1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "apr_arch_atomic.h"
18
19 #ifdef USE_ATOMICS_S390
20
21 APR_DECLARE(apr_status_t) apr_atomic_init(apr_pool_t *p)
22 {
23 #if defined (NEED_ATOMICS_GENERIC64)
24 return apr__atomic_generic64_init(p);
25 #else
26 return APR_SUCCESS;
27 #endif
28 }
29
30 APR_DECLARE(apr_uint32_t) apr_atomic_read32(volatile apr_uint32_t *mem)
31 {
32 return *mem;
33 }
34
35 APR_DECLARE(void) apr_atomic_set32(volatile apr_uint32_t *mem, apr_uint32_t val)
36 {
37 *mem = val;
38 }
39
40 static APR_INLINE apr_uint32_t atomic_add(volatile apr_uint32_t *mem, apr_uint32_t val)
41 {
42 apr_uint32_t prev = *mem, temp;
43
44 asm volatile ("loop_%=:\n"
45 " lr %1,%0\n"
46 " alr %1,%3\n"
47 " cs %0,%1,%2\n"
48 " jl loop_%=\n"
49 : "+d" (prev), "+d" (temp), "=Q" (*mem)
50 : "d" (val), "m" (*mem)
51 : "cc", "memory");
52
53 return prev;
54 }
55
56 APR_DECLARE(apr_uint32_t) apr_atomic_add32(volatile apr_uint32_t *mem, apr_uint32_t val)
57 {
58 return atomic_add(mem, val);
59 }
60
61 APR_DECLARE(apr_uint32_t) apr_atomic_inc32(volatile apr_uint32_t *mem)
62 {
63 return atomic_add(mem, 1);
64 }
65
66 static APR_INLINE apr_uint32_t atomic_sub(volatile apr_uint32_t *mem, apr_uint32_t val)
67 {
68 apr_uint32_t prev = *mem, temp;
69
70 asm volatile ("loop_%=:\n"
71 " lr %1,%0\n"
72 " slr %1,%3\n"
73 " cs %0,%1,%2\n"
74 " jl loop_%=\n"
75 : "+d" (prev), "+d" (temp), "=Q" (*mem)
76 : "d" (val), "m" (*mem)
77 : "cc", "memory");
78
79 return temp;
80 }
81
82 APR_DECLARE(void) apr_atomic_sub32(volatile apr_uint32_t *mem, apr_uint32_t val)
83 {
84 atomic_sub(mem, val);
85 }
86
87 APR_DECLARE(int) apr_atomic_dec32(volatile apr_uint32_t *mem)
88 {
89 return atomic_sub(mem, 1);
90 }
91
92 APR_DECLARE(apr_uint32_t) apr_atomic_cas32(volatile apr_uint32_t *mem, apr_uint32_t with,
93 apr_uint32_t cmp)
94 {
95 asm volatile (" cs %0,%2,%1\n"
96 : "+d" (cmp), "=Q" (*mem)
97 : "d" (with), "m" (*mem)
98 : "cc", "memory");
99
100 return cmp;
101 }
102
103 APR_DECLARE(apr_uint32_t) apr_atomic_xchg32(volatile apr_uint32_t *mem, apr_uint32_t val)
104 {
105 apr_uint32_t prev = *mem;
106
107 asm volatile ("loop_%=:\n"
108 " cs %0,%2,%1\n"
109 " jl loop_%=\n"
110 : "+d" (prev), "=Q" (*mem)
111 : "d" (val), "m" (*mem)
112 : "cc", "memory");
113
114 return prev;
115 }
116
117 APR_DECLARE(void*) apr_atomic_casptr(volatile void **mem, void *with, const void *cmp)
118 {
119 void *prev = (void *) cmp;
120 #if APR_SIZEOF_VOIDP == 4
121 asm volatile (" cs %0,%2,%1\n"
122 : "+d" (prev), "=Q" (*mem)
123 : "d" (with), "m" (*mem)
124 : "cc", "memory");
125 #elif APR_SIZEOF_VOIDP == 8
126 asm volatile (" csg %0,%2,%1\n"
127 : "+d" (prev), "=Q" (*mem)
128 : "d" (with), "m" (*mem)
129 : "cc", "memory");
130 #else
131 #error APR_SIZEOF_VOIDP value not supported
132 #endif
133 return prev;
134 }
135
136 APR_DECLARE(void*) apr_atomic_xchgptr(volatile void **mem, void *with)
137 {
138 void *prev = (void *) *mem;
139 #if APR_SIZEOF_VOIDP == 4
140 asm volatile ("loop_%=:\n"
141 " cs %0,%2,%1\n"
142 " jl loop_%=\n"
143 : "+d" (prev), "=Q" (*mem)
144 : "d" (with), "m" (*mem)
145 : "cc", "memory");
146 #elif APR_SIZEOF_VOIDP == 8
147 asm volatile ("loop_%=:\n"
148 " csg %0,%2,%1\n"
149 " jl loop_%=\n"
150 : "+d" (prev), "=Q" (*mem)
151 : "d" (with), "m" (*mem)
152 : "cc", "memory");
153 #else
154 #error APR_SIZEOF_VOIDP value not supported
155 #endif
156 return prev;
157 }
158
159 #endif /* USE_ATOMICS_S390 */