urcu/uatomic/sparc64.h

   1 #ifndef _URCU_ARCH_UATOMIC_SPARC64_H
   2 #define _URCU_ARCH_UATOMIC_SPARC64_H
   3
   4 /*
   5  * Copyright (c) 1991-1994 by Xerox Corporation.  All rights reserved.
   6  * Copyright (c) 1996-1999 by Silicon Graphics.  All rights reserved.
   7  * Copyright (c) 1999-2003 by Hewlett-Packard Company. All rights reserved.
   8  * Copyright (c) 2009      Mathieu Desnoyers
   9  *
  10  * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
  11  * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
  12  *
  13  * Permission is hereby granted to use or copy this program
  14  * for any purpose,  provided the above notices are retained on all copies.
  15  * Permission to modify the code and to distribute modified code is granted,
  16  * provided the above notices are retained, and a notice that the code was
  17  * modified is included with the above copyright notice.
  18  *
  19  * Code inspired from libuatomic_ops-1.2, inherited in part from the
  20  * Boehm-Demers-Weiser conservative garbage collector.
  21  */
  22
  23 #include <urcu/compiler.h>
  24 #include <urcu/system.h>
  25
  26 #ifdef __cplusplus
  27 extern "C" {
  28 #endif
  29
  30 /* cmpxchg */
  31
  32 static inline __attribute__((always_inline))
  33 unsigned long _uatomic_cmpxchg(void *addr, unsigned long old,
  34                               unsigned long _new, int len)
  35 {
  36         switch (len) {
  37         case 4:
  38         {
  39                 __asm__ __volatile__ (
  40                         "membar #StoreLoad | #LoadLoad\n\t"
  41                         "cas [%1],%2,%0\n\t"
  42                         "membar #StoreLoad | #StoreStore\n\t"
  43                         : "+&r" (_new)
  44                         : "r" (addr), "r" (old)
  45                         : "memory");
  46
  47                 return _new;
  48         }
  49 #if (CAA_BITS_PER_LONG == 64)
  50         case 8:
  51         {
  52                 __asm__ __volatile__ (
  53                         "membar #StoreLoad | #LoadLoad\n\t"
  54                         "casx [%1],%2,%0\n\t"
  55                         "membar #StoreLoad | #StoreStore\n\t"
  56                         : "+&r" (_new)
  57                         : "r" (addr), "r" (old)
  58                         : "memory");
  59
  60                 return _new;
  61         }
  62 #endif
  63         }
  64         __builtin_trap();
  65         return 0;
  66 }
  67
  68
  69 #define uatomic_cmpxchg(addr, old, _new)                                       \
  70         ((__typeof__(*(addr))) _uatomic_cmpxchg((addr),                        \
  71                                                 caa_cast_long_keep_sign(old),  \
  72                                                 caa_cast_long_keep_sign(_new), \
  73                                                 sizeof(*(addr))))
  74
  75 #ifdef __cplusplus
  76 }
  77 #endif
  78
  79 #include <urcu/uatomic/generic.h>
  80
  81 #endif /* _URCU_ARCH_UATOMIC_PPC_H */