1 #ifndef _URCU_UATOMIC_ARCH_S390_H
2 #define _URCU_UATOMIC_ARCH_S390_H
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)".
9 * Copyright (c) 2009 Novell, Inc.
10 * Author: Jan Blunck <jblunck@suse.de>
11 * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
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:
20 * The above copyright notice and this permission notice shall be included in
21 * all copies or substantial portions of the Software.
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
32 #include <urcu/compiler.h>
33 #include <urcu/system.h>
39 #ifndef __SIZEOF_LONG__
41 #define __SIZEOF_LONG__ 8
43 #define __SIZEOF_LONG__ 4
48 #define BITS_PER_LONG (__SIZEOF_LONG__ * 8)
51 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
52 #define COMPILER_HAVE_SHORT_MEM_OPERAND
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
62 #ifdef COMPILER_HAVE_SHORT_MEM_OPERAND
64 #define MEMOP_OUT(addr) "=Q" (*(addr))
65 #define MEMOP_IN(addr) "Q" (*(addr))
66 #define MEMOP_REF(op) #op /* op refer to MEMOP_IN operand */
68 #else /* !COMPILER_HAVE_SHORT_MEM_OPERAND */
70 #define MEMOP_OUT(addr) "=m" (*(addr))
71 #define MEMOP_IN(addr) "a" (addr), "m" (*(addr))
72 #define MEMOP_REF(op) "0(" #op ")" /* op refer to MEMOP_IN operand */
74 #endif /* !COMPILER_HAVE_SHORT_MEM_OPERAND */
76 struct __uatomic_dummy
{
79 #define __hp(x) ((struct __uatomic_dummy *)(x))
83 static inline __attribute__((always_inline
))
84 unsigned long _uatomic_exchange(volatile void *addr
, unsigned long val
, int len
)
92 "0: cs %0,%2," MEMOP_REF(%3) "\n"
94 : "=&r" (old_val
), MEMOP_OUT (__hp(addr
))
95 : "r" (val
), MEMOP_IN (__hp(addr
))
99 #if (BITS_PER_LONG == 64)
102 unsigned long old_val
;
104 __asm__
__volatile__(
105 "0: csg %0,%2," MEMOP_REF(%3) "\n"
107 : "=&r" (old_val
), MEMOP_OUT (__hp(addr
))
108 : "r" (val
), MEMOP_IN (__hp(addr
))
114 __asm__
__volatile__(".long 0xd00d00");
120 #define uatomic_xchg(addr, v) \
121 (__typeof__(*(addr))) _uatomic_exchange((addr), (unsigned long)(v), \
126 static inline __attribute__((always_inline
))
127 unsigned long _uatomic_cmpxchg(void *addr
, unsigned long old
,
128 unsigned long _new
, int len
)
133 unsigned int old_val
= (unsigned int)old
;
135 __asm__
__volatile__(
136 " cs %0,%2," MEMOP_REF(%3) "\n"
137 : "+r" (old_val
), MEMOP_OUT (__hp(addr
))
138 : "r" (_new
), MEMOP_IN (__hp(addr
))
142 #if (BITS_PER_LONG == 64)
145 __asm__
__volatile__(
146 " csg %0,%2," MEMOP_REF(%3) "\n"
147 : "+r" (old
), MEMOP_OUT (__hp(addr
))
148 : "r" (_new
), MEMOP_IN (__hp(addr
))
154 __asm__
__volatile__(".long 0xd00d00");
160 #define uatomic_cmpxchg(addr, old, _new) \
161 (__typeof__(*(addr))) _uatomic_cmpxchg((addr), \
162 (unsigned long)(old), \
163 (unsigned long)(_new), \
170 #include <urcu/uatomic_generic.h>
172 #endif /* _URCU_UATOMIC_ARCH_S390_H */
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