sysdeps/sparc/sparc32/sparcv9/atomicity.h

   1 /* Low-level functions for atomic operations.  Sparc32+v9 version.
   2    Copyright (C) 1999 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #ifndef _ATOMICITY_H
  21 #define _ATOMICITY_H    1
  22
  23 #include <inttypes.h>
  24
  25 static inline int
  26 __attribute__ ((unused))
  27 exchange_and_add (volatile uint32_t *mem, int val)
  28 {
  29   uint32_t tmp1, tmp2;
  30
  31   __asm__ __volatile__("1:      lduw    [%2], %0\n\t"
  32                        "        add     %0, %3, %1\n\t"
  33                        "        cas     [%2], %0, %1\n\t"
  34                        "        sub     %0, %1, %0\n\t"
  35                        "        brnz,pn %0, 1b\n\t"
  36                        "         nop"
  37                        : "=&r" (tmp1), "=&r" (tmp2)
  38                        : "r" (mem), "r" (val)
  39                        : "memory");
  40   return tmp2;
  41 }
  42
  43 static inline void
  44 __attribute__ ((unused))
  45 atomic_add (volatile uint32_t *mem, int val)
  46 {
  47   uint32_t tmp1, tmp2;
  48
  49   __asm__ __volatile__("1:      lduw    [%2], %0\n\t"
  50                        "        add     %0, %3, %1\n\t"
  51                        "        cas     [%2], %0, %1\n\t"
  52                        "        sub     %0, %1, %0\n\t"
  53                        "        brnz,pn %0, 1b\n\t"
  54                        "         nop"
  55                        : "=&r" (tmp1), "=&r" (tmp2)
  56                        : "r" (mem), "r" (val)
  57                        : "memory");
  58 }
  59
  60 static inline int
  61 __attribute__ ((unused))
  62 compare_and_swap (volatile long int *p, long int oldval, long int newval)
  63 {
  64   register long int tmp, tmp2;
  65
  66   __asm__ __volatile__("1:      lduw    [%4], %0\n\t"
  67                        "        mov     %2, %1\n\t"
  68                        "        cmp     %0, %3\n\t"
  69                        "        bne,a,pn %%xcc, 2f\n\t"
  70                        "         mov    0, %0\n\t"
  71                        "        cas     [%4], %0, %1\n\t"
  72                        "        sub     %0, %1, %0\n\t"
  73                        "        brnz,pn %0, 1b\n\t"
  74                        "         mov    1, %0\n\t"
  75                        "2:"
  76                        : "=&r" (tmp), "=&r" (tmp2)
  77                        : "r" (newval), "r" (oldval), "r" (p)
  78                        : "memory");
  79   return tmp;
  80 }
  81
  82 #endif /* atomicity.h */