sysdeps/mips/atomicity.h

   1 /* Low-level functions for atomic operations. Mips version.
   2    Copyright (C) 2001, 2002, 2003, 2004 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 Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _MIPS_ATOMICITY_H
  21 #define _MIPS_ATOMICITY_H    1
  22
  23 #include <inttypes.h>
  24 #include <sgidefs.h>
  25
  26 static inline int
  27 __attribute__ ((unused))
  28 exchange_and_add (volatile uint32_t *mem, int val)
  29 {
  30   int result, tmp;
  31
  32   __asm__ __volatile__
  33     ("/* Inline exchange & add */\n"
  34      "1:\n\t"
  35      ".set      push\n\t"
  36 #if _MIPS_SIM == _ABIO32
  37      ".set      mips2\n\t"
  38 #endif
  39      "ll        %0,%3\n\t"
  40      "addu      %1,%4,%0\n\t"
  41      "sc        %1,%2\n\t"
  42      ".set      pop\n\t"
  43      "beqz      %1,1b\n\t"
  44      "/* End exchange & add */"
  45      : "=&r"(result), "=&r"(tmp), "=m"(*mem)
  46      : "m" (*mem), "r"(val)
  47      : "memory");
  48
  49   return result;
  50 }
  51
  52 static inline void
  53 __attribute__ ((unused))
  54 atomic_add (volatile uint32_t *mem, int val)
  55 {
  56   int result;
  57
  58   __asm__ __volatile__
  59     ("/* Inline atomic add */\n"
  60      "1:\n\t"
  61      ".set      push\n\t"
  62 #if _MIPS_SIM == _ABIO32
  63      ".set      mips2\n\t"
  64 #endif
  65      "ll        %0,%2\n\t"
  66      "addu      %0,%3,%0\n\t"
  67      "sc        %0,%1\n\t"
  68      ".set      pop\n\t"
  69      "beqz      %0,1b\n\t"
  70      "/* End atomic add */"
  71      : "=&r"(result), "=m"(*mem)
  72      : "m" (*mem), "r"(val)
  73      : "memory");
  74 }
  75
  76 static inline int
  77 __attribute__ ((unused))
  78 compare_and_swap (volatile long int *p, long int oldval, long int newval)
  79 {
  80   long int ret, temp;
  81
  82   __asm__ __volatile__
  83     ("/* Inline compare & swap */\n"
  84      "1:\n\t"
  85      ".set      push\n\t"
  86 #if _MIPS_SIM == _ABIO32
  87      ".set      mips2\n\t"
  88 #endif
  89 #if _MIPS_SIM == _ABI64
  90      "lld       %1,%5\n\t"
  91 #else
  92      "ll        %1,%5\n\t"
  93 #endif
  94      "move      %0,$0\n\t"
  95      "bne       %1,%3,2f\n\t"
  96      "move      %0,%4\n\t"
  97 #if _MIPS_SIM == _ABI64
  98      "scd       %0,%2\n\t"
  99 #else
 100      "sc        %0,%2\n\t"
 101 #endif
 102      ".set      pop\n\t"
 103      "beqz      %0,1b\n"
 104      "2:\n\t"
 105      "/* End compare & swap */"
 106      : "=&r" (ret), "=&r" (temp), "=m" (*p)
 107      : "r" (oldval), "r" (newval), "m" (*p)
 108      : "memory");
 109
 110   return ret;
 111 }
 112
 113 #endif /* atomicity.h */