include/urcu/uatomic/sparc64.h

   1 // SPDX-FileCopyrightText: 1991-1994 by Xerox Corporation.  All rights reserved.
   2 // SPDX-FileCopyrightText: 1996-1999 by Silicon Graphics.  All rights reserved.
   3 // SPDX-FileCopyrightText: 1999-2003 Hewlett-Packard Development Company, L.P.
   4 // SPDX-FileCopyrightText: 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5 //
   6 // SPDX-License-Identifier: LicenseRef-Boehm-GC
   7
   8 #ifndef _URCU_ARCH_UATOMIC_SPARC64_H
   9 #define _URCU_ARCH_UATOMIC_SPARC64_H
  10
  11 /*
  12  * Code inspired from libuatomic_ops-1.2, inherited in part from the
  13  * Boehm-Demers-Weiser conservative garbage collector.
  14  */
  15
  16 #include <urcu/compiler.h>
  17 #include <urcu/system.h>
  18
  19 #ifdef __cplusplus
  20 extern "C" {
  21 #endif
  22
  23 /* cmpxchg */
  24
  25 static inline __attribute__((always_inline))
  26 unsigned long _uatomic_cmpxchg(void *addr, unsigned long old,
  27                               unsigned long _new, int len)
  28 {
  29         switch (len) {
  30         case 4:
  31         {
  32                 __asm__ __volatile__ (
  33                         "membar #StoreLoad | #LoadLoad\n\t"
  34                         "cas [%1],%2,%0\n\t"
  35                         "membar #StoreLoad | #StoreStore\n\t"
  36                         : "+&r" (_new)
  37                         : "r" (addr), "r" (old)
  38                         : "memory");
  39
  40                 return _new;
  41         }
  42 #if (CAA_BITS_PER_LONG == 64)
  43         case 8:
  44         {
  45                 __asm__ __volatile__ (
  46                         "membar #StoreLoad | #LoadLoad\n\t"
  47                         "casx [%1],%2,%0\n\t"
  48                         "membar #StoreLoad | #StoreStore\n\t"
  49                         : "+&r" (_new)
  50                         : "r" (addr), "r" (old)
  51                         : "memory");
  52
  53                 return _new;
  54         }
  55 #endif
  56         }
  57         __builtin_trap();
  58         return 0;
  59 }
  60
  61
  62 #define uatomic_cmpxchg(addr, old, _new)                                       \
  63         ((__typeof__(*(addr))) _uatomic_cmpxchg((addr),                        \
  64                                                 caa_cast_long_keep_sign(old),  \
  65                                                 caa_cast_long_keep_sign(_new), \
  66                                                 sizeof(*(addr))))
  67
  68 #ifdef __cplusplus
  69 }
  70 #endif
  71
  72 #include <urcu/uatomic/generic.h>
  73
  74 #endif /* _URCU_ARCH_UATOMIC_PPC_H */