--- sysdeps/arc/atomic-machine.h | 69 ++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+) create mode 100644 sysdeps/arc/atomic-machine.h
diff --git a/sysdeps/arc/atomic-machine.h b/sysdeps/arc/atomic-machine.h new file mode 100644 index 000000000000..1c8638bb44ef --- /dev/null +++ b/sysdeps/arc/atomic-machine.h @@ -0,0 +1,69 @@ +/* Low-level functions for atomic operations. ARC version. + Copyright (C) 2020 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 _ARC_BITS_ATOMIC_H +#define _ARC_BITS_ATOMIC_H 1 + +#include <stdint.h> + +typedef int32_t atomic32_t; +typedef uint32_t uatomic32_t; +typedef int_fast32_t atomic_fast32_t; +typedef uint_fast32_t uatomic_fast32_t; + +typedef intptr_t atomicptr_t; +typedef uintptr_t uatomicptr_t; +typedef intmax_t atomic_max_t; +typedef uintmax_t uatomic_max_t; + +#define __HAVE_64B_ATOMICS 0 +#define USE_ATOMIC_COMPILER_BUILTINS 1 + +/* ARC does have legacy atomic EX reg, [mem] instruction but the micro-arch + is not as optimal as LLOCK/SCOND specially for SMP. */ +#define ATOMIC_EXCHANGE_USES_CAS 1 + +#define __arch_compare_and_exchange_bool_8_acq(mem, newval, oldval) \ + (abort (), 0) +#define __arch_compare_and_exchange_bool_16_acq(mem, newval, oldval) \ + (abort (), 0) +#define __arch_compare_and_exchange_bool_64_acq(mem, newval, oldval) \ + (abort (), 0) + +#define __arch_compare_and_exchange_val_8_int(mem, newval, oldval, model) \ + (abort (), (__typeof (*mem)) 0) +#define __arch_compare_and_exchange_val_16_int(mem, newval, oldval, model) \ + (abort (), (__typeof (*mem)) 0) +#define __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model) \ + (abort (), (__typeof (*mem)) 0) + +#define __arch_compare_and_exchange_val_32_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) \ + __atomic_val_bysize (__arch_compare_and_exchange_val, int, \ + mem, new, old, __ATOMIC_ACQUIRE) + +#define atomic_full_barrier() ({ asm volatile ("dmb 3":::"memory"); }) + +#endif /* _ARC_BITS_ATOMIC_H */ -- 2.20.1 _______________________________________________ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc
