/* Atomic operations. Sparc version. Copyright (C) 2019-2024 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ #ifndef _ATOMIC_MACHINE_H #define _ATOMIC_MACHINE_H 1 #ifdef __arch64__ # define __HAVE_64B_ATOMICS 1 #else # define __HAVE_64B_ATOMICS 0 #endif #define USE_ATOMIC_COMPILER_BUILTINS 1 /* XXX Is this actually correct? */ #define ATOMIC_EXCHANGE_USES_CAS __HAVE_64B_ATOMICS /* Compare and exchange. For all "bool" routines, we return FALSE if exchange successful. */ #define __arch_compare_and_exchange_val_int(mem, newval, oldval, model) \ ({ \ typeof (*mem) __oldval = (oldval); \ __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \ model, __ATOMIC_RELAXED); \ __oldval; \ }) #define atomic_compare_and_exchange_val_acq(mem, new, old) \ ({ \ __typeof ((__typeof (*(mem))) *(mem)) __result; \ if (sizeof (*mem) == 4 \ || (__HAVE_64B_ATOMICS && sizeof (*mem) == 8)) \ __result = __arch_compare_and_exchange_val_int (mem, new, old, \ __ATOMIC_ACQUIRE); \ else \ abort (); \ __result; \ }) #ifdef __sparc_v9__ # define atomic_full_barrier() \ __asm __volatile ("membar #LoadLoad | #LoadStore" \ " | #StoreLoad | #StoreStore" : : : "memory") # define atomic_read_barrier() \ __asm __volatile ("membar #LoadLoad | #LoadStore" : : : "memory") # define atomic_write_barrier() \ __asm __volatile ("membar #LoadStore | #StoreStore" : : : "memory") extern void __cpu_relax (void); # define atomic_spin_nop() __cpu_relax () #endif #endif /* _ATOMIC_MACHINE_H */