1 /* Atomic operations. Sparc version. 2 Copyright (C) 2019-2021 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, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef _ATOMIC_MACHINE_H 20 #define _ATOMIC_MACHINE_H 1 21 22 #ifdef __arch64__ 23 # define __HAVE_64B_ATOMICS 1 24 #else 25 # define __HAVE_64B_ATOMICS 0 26 #endif 27 #define USE_ATOMIC_COMPILER_BUILTINS 1 28 29 /* XXX Is this actually correct? */ 30 #define ATOMIC_EXCHANGE_USES_CAS __HAVE_64B_ATOMICS 31 32 /* Compare and exchange. 33 For all "bool" routines, we return FALSE if exchange succesful. */ 34 35 #define __arch_compare_and_exchange_val_int(mem, newval, oldval, model) \ 36 ({ \ 37 typeof (*mem) __oldval = (oldval); \ 38 __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \ 39 model, __ATOMIC_RELAXED); \ 40 __oldval; \ 41 }) 42 43 #define atomic_compare_and_exchange_val_acq(mem, new, old) \ 44 ({ \ 45 __typeof ((__typeof (*(mem))) *(mem)) __result; \ 46 if (sizeof (*mem) == 4 \ 47 || (__HAVE_64B_ATOMICS && sizeof (*mem) == 8)) \ 48 __result = __arch_compare_and_exchange_val_int (mem, new, old, \ 49 __ATOMIC_ACQUIRE); \ 50 else \ 51 abort (); \ 52 __result; \ 53 }) 54 55 #ifdef __sparc_v9__ 56 # define atomic_full_barrier() \ 57 __asm __volatile ("membar #LoadLoad | #LoadStore" \ 58 " | #StoreLoad | #StoreStore" : : : "memory") 59 # define atomic_read_barrier() \ 60 __asm __volatile ("membar #LoadLoad | #LoadStore" : : : "memory") 61 # define atomic_write_barrier() \ 62 __asm __volatile ("membar #LoadStore | #StoreStore" : : : "memory") 63 64 extern void __cpu_relax (void); 65 # define atomic_spin_nop() __cpu_relax () 66 #endif 67 68 #endif /* _ATOMIC_MACHINE_H */ 69