l4/pkg/uclibc/lib/contrib/uclibc/libc/sysdeps/linux/xtensa/bits/atomic.h

   1 /* Copyright (C) 2012 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _BITS_ATOMIC_H
  19 #define _BITS_ATOMIC_H  1
  20
  21 #include <inttypes.h>
  22
  23 typedef int32_t atomic32_t;
  24 typedef uint32_t uatomic32_t;
  25 typedef int_fast32_t atomic_fast32_t;
  26 typedef uint_fast32_t uatomic_fast32_t;
  27
  28 typedef int64_t atomic64_t;
  29 typedef uint64_t uatomic64_t;
  30 typedef int_fast64_t atomic_fast64_t;
  31 typedef uint_fast64_t uatomic_fast64_t;
  32
  33 typedef intptr_t atomicptr_t;
  34 typedef uintptr_t uatomicptr_t;
  35 typedef intmax_t atomic_max_t;
  36 typedef uintmax_t uatomic_max_t;
  37
  38
  39 /* Xtensa has only a 32-bit form of a store-conditional instruction.  */
  40
  41 #define __arch_compare_and_exchange_bool_8_acq(mem, newval, oldval) \
  42       (abort (), 0)
  43
  44 #define __arch_compare_and_exchange_bool_16_acq(mem, newval, oldval) \
  45       (abort (), 0)
  46
  47 #define __arch_compare_and_exchange_bool_8_rel(mem, newval, oldval) \
  48       (abort (), 0)
  49
  50 #define __arch_compare_and_exchange_bool_16_rel(mem, newval, oldval) \
  51       (abort (), 0)
  52
  53 /* Atomically store NEWVAL in *MEM if *MEM is equal to OLDVAL.
  54    Return the old *MEM value.  */
  55
  56 #define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval)  \
  57   ({__typeof__(*(mem)) __tmp, __value;                               \
  58     __asm__ __volatile__(                                            \
  59       "1:     l32i    %1, %2, 0               \n"                    \
  60       "       bne     %1, %4, 2f              \n"                    \
  61       "       wsr     %1, SCOMPARE1           \n"                    \
  62       "       mov     %0, %1                  \n"                    \
  63       "       mov     %1, %3                  \n"                    \
  64       "       s32c1i  %1, %2, 0               \n"                    \
  65       "       bne     %0, %1, 1b              \n"                    \
  66       "2:                                     \n"                    \
  67       : "=&a" (__value), "=&a" (__tmp)                               \
  68       : "a" (mem), "a" (newval), "a" (oldval)                        \
  69       : "memory" );                                                  \
  70     __tmp;                                                           \
  71   })
  72
  73 /* Atomically store NEWVAL in *MEM if *MEM is equal to OLDVAL.
  74    Return zero if *MEM was changed or non-zero if no exchange happened.  */
  75
  76 #define __arch_compare_and_exchange_bool_32_acq(mem, newval, oldval) \
  77   ({__typeof__(*(mem)) __tmp, __value;                               \
  78     __asm__ __volatile__(                                            \
  79       "1:     l32i    %0, %2, 0               \n"                    \
  80       "       sub     %1, %4, %0              \n"                    \
  81       "       bnez    %1, 2f                  \n"                    \
  82       "       wsr     %0, SCOMPARE1           \n"                    \
  83       "       mov     %1, %3                  \n"                    \
  84       "       s32c1i  %1, %2, 0               \n"                    \
  85       "       bne     %0, %1, 1b              \n"                    \
  86       "       movi    %1, 0                   \n"                    \
  87       "2:                                     \n"                    \
  88       : "=&a" (__value), "=&a" (__tmp)                               \
  89       : "a" (mem), "a" (newval), "a" (oldval)                        \
  90       : "memory" );                                                  \
  91     __tmp != 0;                                                      \
  92   })
  93
  94 /* Store NEWVALUE in *MEM and return the old value.  */
  95
  96 #define __arch_exchange_32_acq(mem, newval)                          \
  97   ({__typeof__(*(mem)) __tmp, __value;                               \
  98     __asm__ __volatile__(                                            \
  99       "1:     l32i    %0, %2, 0               \n"                    \
 100       "       wsr     %0, SCOMPARE1           \n"                    \
 101       "       mov     %1, %3                  \n"                    \
 102       "       s32c1i  %1, %2, 0               \n"                    \
 103       "       bne     %0, %1, 1b              \n"                    \
 104       : "=&a" (__value), "=&a" (__tmp)                               \
 105       : "a" (mem), "a" (newval)                                      \
 106       : "memory" );                                                  \
 107     __tmp;                                                           \
 108   })
 109
 110 /* Add VALUE to *MEM and return the old value of *MEM.  */
 111
 112 #define __arch_atomic_exchange_and_add_32(mem, value)                \
 113   ({__typeof__(*(mem)) __tmp, __value;                               \
 114     __asm__ __volatile__(                                            \
 115       "1:     l32i    %0, %2, 0               \n"                    \
 116       "       wsr     %0, SCOMPARE1           \n"                    \
 117       "       add     %1, %0, %3              \n"                    \
 118       "       s32c1i  %1, %2, 0               \n"                    \
 119       "       bne     %0, %1, 1b              \n"                    \
 120       : "=&a" (__value), "=&a" (__tmp)                               \
 121       : "a" (mem), "a" (value)                                       \
 122       : "memory" );                                                  \
 123     __tmp;                                                           \
 124   })
 125
 126 /* Subtract VALUE from *MEM and return the old value of *MEM.  */
 127
 128 #define __arch_atomic_exchange_and_sub_32(mem, value)                \
 129   ({__typeof__(*(mem)) __tmp, __value;                               \
 130     __asm__ __volatile__(                                            \
 131       "1:     l32i    %0, %2, 0               \n"                    \
 132       "       wsr     %0, SCOMPARE1           \n"                    \
 133       "       sub     %1, %0, %3              \n"                    \
 134       "       s32c1i  %1, %2, 0               \n"                    \
 135       "       bne     %0, %1, 1b              \n"                    \
 136       : "=&a" (__value), "=&a" (__tmp)                               \
 137       : "a" (mem), "a" (value)                                       \
 138       : "memory" );                                                  \
 139     __tmp;                                                           \
 140   })
 141
 142 /* Decrement *MEM if it is > 0, and return the old value.  */
 143
 144 #define __arch_atomic_decrement_if_positive_32(mem)                  \
 145   ({__typeof__(*(mem)) __tmp, __value;                               \
 146     __asm__ __volatile__(                                            \
 147       "1:     l32i    %0, %2, 0               \n"                    \
 148       "       blti    %0, 1, 2f               \n"                    \
 149       "       wsr     %0, SCOMPARE1           \n"                    \
 150       "       addi    %1, %0, -1              \n"                    \
 151       "       s32c1i  %1, %2, 0               \n"                    \
 152       "       bne     %0, %1, 1b              \n"                    \
 153       "2:                                     \n"                    \
 154       : "=&a" (__value), "=&a" (__tmp)                               \
 155       : "a" (mem)                                                    \
 156       : "memory" );                                                  \
 157     __value;                                                         \
 158   })
 159
 160
 161 /* These are the preferred public interfaces: */
 162
 163 #define atomic_compare_and_exchange_val_acq(mem, newval, oldval)     \
 164   ({                                                                 \
 165     if (sizeof (*mem) != 4)                                          \
 166       abort();                                                       \
 167     __arch_compare_and_exchange_val_32_acq(mem, newval, oldval);     \
 168   })
 169
 170 #define atomic_exchange_acq(mem, newval)                             \
 171   ({                                                                 \
 172     if (sizeof(*(mem)) != 4)                                         \
 173       abort();                                                       \
 174     __arch_exchange_32_acq(mem, newval);                             \
 175   })
 176
 177 #define atomic_exchange_and_add(mem, newval)                         \
 178   ({                                                                 \
 179     if (sizeof(*(mem)) != 4)                                         \
 180       abort();                                                       \
 181     __arch_atomic_exchange_and_add_32(mem, newval);                  \
 182   })
 183
 184 #define atomic_exchange_and_sub(mem, newval)                         \
 185   ({                                                                 \
 186     if (sizeof(*(mem)) != 4)                                         \
 187       abort();                                                       \
 188     __arch_atomic_exchange_and_sub_32(mem, newval);                  \
 189   })
 190
 191 #define atomic_decrement_if_positive(mem)                            \
 192   ({                                                                 \
 193     if (sizeof(*(mem)) != 4)                                         \
 194       abort();                                                       \
 195     __arch_atomic_decrement_if_positive_32(mem);                     \
 196   })
 197
 198
 199 # define __arch_compare_and_exchange_bool_64_acq(mem, newval, oldval) \
 200     (abort (), 0)
 201
 202 # define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \
 203     (abort (), (__typeof (*mem)) 0)
 204
 205 # define __arch_compare_and_exchange_bool_64_rel(mem, newval, oldval) \
 206     (abort (), 0)
 207
 208 # define __arch_compare_and_exchange_val_64_rel(mem, newval, oldval) \
 209     (abort (), (__typeof (*mem)) 0)
 210
 211 # define __arch_atomic_exchange_64_acq(mem, value) \
 212     ({ abort (); (*mem) = (value); })
 213
 214 # define __arch_atomic_exchange_64_rel(mem, value) \
 215     ({ abort (); (*mem) = (value); })
 216
 217 # define __arch_atomic_exchange_and_add_64(mem, value) \
 218     ({ abort (); (*mem) = (value); })
 219
 220 # define __arch_atomic_increment_val_64(mem) \
 221     ({ abort (); (*mem)++; })
 222
 223 # define __arch_atomic_decrement_val_64(mem) \
 224     ({ abort (); (*mem)--; })
 225
 226 # define __arch_atomic_decrement_if_positive_64(mem) \
 227     ({ abort (); (*mem)--; })
 228
 229
 230
 231 #endif /* _BITS_ATOMIC_H */
 232