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
apr_atomic_init(apr_pool_t * p)21 APR_DECLARE(apr_status_t) apr_atomic_init(apr_pool_t *p)
22 {
23 return APR_SUCCESS;
24 }
25
apr_atomic_read32(volatile apr_uint32_t * mem)26 APR_DECLARE(apr_uint32_t) apr_atomic_read32(volatile apr_uint32_t *mem)
27 {
28 return *mem;
29 }
30
apr_atomic_set32(volatile apr_uint32_t * mem,apr_uint32_t val)31 APR_DECLARE(void) apr_atomic_set32(volatile apr_uint32_t *mem, apr_uint32_t val)
32 {
33 *mem = val;
34 }
35
atomic_add(volatile apr_uint32_t * mem,apr_uint32_t val)36 static APR_INLINE apr_uint32_t atomic_add(volatile apr_uint32_t *mem, apr_uint32_t val)
37 {
38 apr_uint32_t prev = *mem, temp;
39
40 asm volatile ("loop_%=:\n"
41 " lr %1,%0\n"
42 " alr %1,%3\n"
43 " cs %0,%1,%2\n"
44 " jl loop_%=\n"
45 : "+d" (prev), "+d" (temp), "=Q" (*mem)
46 : "d" (val), "m" (*mem)
47 : "cc", "memory");
48
49 return prev;
50 }
51
apr_atomic_add32(volatile apr_uint32_t * mem,apr_uint32_t val)52 APR_DECLARE(apr_uint32_t) apr_atomic_add32(volatile apr_uint32_t *mem, apr_uint32_t val)
53 {
54 return atomic_add(mem, val);
55 }
56
apr_atomic_inc32(volatile apr_uint32_t * mem)57 APR_DECLARE(apr_uint32_t) apr_atomic_inc32(volatile apr_uint32_t *mem)
58 {
59 return atomic_add(mem, 1);
60 }
61
atomic_sub(volatile apr_uint32_t * mem,apr_uint32_t val)62 static APR_INLINE apr_uint32_t atomic_sub(volatile apr_uint32_t *mem, apr_uint32_t val)
63 {
64 apr_uint32_t prev = *mem, temp;
65
66 asm volatile ("loop_%=:\n"
67 " lr %1,%0\n"
68 " slr %1,%3\n"
69 " cs %0,%1,%2\n"
70 " jl loop_%=\n"
71 : "+d" (prev), "+d" (temp), "=Q" (*mem)
72 : "d" (val), "m" (*mem)
73 : "cc", "memory");
74
75 return temp;
76 }
77
apr_atomic_sub32(volatile apr_uint32_t * mem,apr_uint32_t val)78 APR_DECLARE(void) apr_atomic_sub32(volatile apr_uint32_t *mem, apr_uint32_t val)
79 {
80 atomic_sub(mem, val);
81 }
82
apr_atomic_dec32(volatile apr_uint32_t * mem)83 APR_DECLARE(int) apr_atomic_dec32(volatile apr_uint32_t *mem)
84 {
85 return atomic_sub(mem, 1);
86 }
87
apr_atomic_cas32(volatile apr_uint32_t * mem,apr_uint32_t with,apr_uint32_t cmp)88 APR_DECLARE(apr_uint32_t) apr_atomic_cas32(volatile apr_uint32_t *mem, apr_uint32_t with,
89 apr_uint32_t cmp)
90 {
91 asm volatile (" cs %0,%2,%1\n"
92 : "+d" (cmp), "=Q" (*mem)
93 : "d" (with), "m" (*mem)
94 : "cc", "memory");
95
96 return cmp;
97 }
98
apr_atomic_xchg32(volatile apr_uint32_t * mem,apr_uint32_t val)99 APR_DECLARE(apr_uint32_t) apr_atomic_xchg32(volatile apr_uint32_t *mem, apr_uint32_t val)
100 {
101 apr_uint32_t prev = *mem;
102
103 asm volatile ("loop_%=:\n"
104 " cs %0,%2,%1\n"
105 " jl loop_%=\n"
106 : "+d" (prev), "=Q" (*mem)
107 : "d" (val), "m" (*mem)
108 : "cc", "memory");
109
110 return prev;
111 }
112
apr_atomic_casptr(volatile void ** mem,void * with,const void * cmp)113 APR_DECLARE(void*) apr_atomic_casptr(volatile void **mem, void *with, const void *cmp)
114 {
115 void *prev = (void *) cmp;
116 #if APR_SIZEOF_VOIDP == 4
117 asm volatile (" cs %0,%2,%1\n"
118 : "+d" (prev), "=Q" (*mem)
119 : "d" (with), "m" (*mem)
120 : "cc", "memory");
121 #elif APR_SIZEOF_VOIDP == 8
122 asm volatile (" csg %0,%2,%1\n"
123 : "+d" (prev), "=Q" (*mem)
124 : "d" (with), "m" (*mem)
125 : "cc", "memory");
126 #else
127 #error APR_SIZEOF_VOIDP value not supported
128 #endif
129 return prev;
130 }
131
apr_atomic_xchgptr(volatile void ** mem,void * with)132 APR_DECLARE(void*) apr_atomic_xchgptr(volatile void **mem, void *with)
133 {
134 void *prev = (void *) *mem;
135 #if APR_SIZEOF_VOIDP == 4
136 asm volatile ("loop_%=:\n"
137 " cs %0,%2,%1\n"
138 " jl loop_%=\n"
139 : "+d" (prev), "=Q" (*mem)
140 : "d" (with), "m" (*mem)
141 : "cc", "memory");
142 #elif APR_SIZEOF_VOIDP == 8
143 asm volatile ("loop_%=:\n"
144 " csg %0,%2,%1\n"
145 " jl loop_%=\n"
146 : "+d" (prev), "=Q" (*mem)
147 : "d" (with), "m" (*mem)
148 : "cc", "memory");
149 #else
150 #error APR_SIZEOF_VOIDP value not supported
151 #endif
152 return prev;
153 }
154
155 #endif /* USE_ATOMICS_S390 */
156