[glibc] LoongArch: Atomic and Locking Routines

[Adhemerval Zanella <azanella@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=327588226198995d2daa62e127ef45af9bcf182d

commit 327588226198995d2daa62e127ef45af9bcf182d
Author: caiyinyu <caiyinyu@loongson.cn>
Date:   Tue Jul 19 09:20:49 2022 +0800

    LoongArch: Atomic and Locking Routines

Diff:
---
 sysdeps/unix/sysv/linux/loongarch/atomic-machine.h | 147 +++++++++++++++++++++
 1 file changed, 147 insertions(+)

diff --git a/sysdeps/unix/sysv/linux/loongarch/atomic-machine.h b/sysdeps/unix/sysv/linux/loongarch/atomic-machine.h
new file mode 100644
index 0000000000..d1b8f1c11b
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/loongarch/atomic-machine.h
@@ -0,0 +1,147 @@
+/* Atomic operations.
+   Copyright (C) 2022 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 _LINUX_LOONGARCH_BITS_ATOMIC_H
+#define _LINUX_LOONGARCH_BITS_ATOMIC_H 1
+
+#define atomic_full_barrier() __sync_synchronize ()
+
+#define __HAVE_64B_ATOMICS (__loongarch_grlen >= 64)
+#define USE_ATOMIC_COMPILER_BUILTINS 1
+#define ATOMIC_EXCHANGE_USES_CAS 0
+
+/* Compare and exchange.
+   For all "bool" routines, we return FALSE if exchange succesful.  */
+
+#define __arch_compare_and_exchange_bool_8_int(mem, newval, oldval, model) \
+  ({ \
+    typeof (*mem) __oldval = (oldval); \
+    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, model, \
+				  __ATOMIC_RELAXED); \
+  })
+
+#define __arch_compare_and_exchange_bool_16_int(mem, newval, oldval, model) \
+  ({ \
+    typeof (*mem) __oldval = (oldval); \
+    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, model, \
+				  __ATOMIC_RELAXED); \
+  })
+
+#define __arch_compare_and_exchange_bool_32_int(mem, newval, oldval, model) \
+  ({ \
+    typeof (*mem) __oldval = (oldval); \
+    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, model, \
+				  __ATOMIC_RELAXED); \
+  })
+
+#define __arch_compare_and_exchange_bool_64_int(mem, newval, oldval, model) \
+  ({ \
+    typeof (*mem) __oldval = (oldval); \
+    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, model, \
+				  __ATOMIC_RELAXED); \
+  })
+
+#define __arch_compare_and_exchange_val_8_int(mem, newval, oldval, model) \
+  ({ \
+    typeof (*mem) __oldval = (oldval); \
+    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, model, \
+				 __ATOMIC_RELAXED); \
+    __oldval; \
+  })
+
+#define __arch_compare_and_exchange_val_16_int(mem, newval, oldval, model) \
+  ({ \
+    typeof (*mem) __oldval = (oldval); \
+    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, model, \
+				 __ATOMIC_RELAXED); \
+    __oldval; \
+  })
+
+#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 __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model) \
+  ({ \
+    typeof (*mem) __oldval = (oldval); \
+    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, model, \
+				 __ATOMIC_RELAXED); \
+    __oldval; \
+  })
+
+/* Atomic compare and exchange.  */
+
+#define atomic_compare_and_exchange_bool_acq(mem, new, old) \
+  __atomic_bool_bysize (__arch_compare_and_exchange_bool, int, mem, new, old, \
+			__ATOMIC_ACQUIRE)
+
+#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_compare_and_exchange_val_rel(mem, new, old) \
+  __atomic_val_bysize (__arch_compare_and_exchange_val, int, mem, new, old, \
+		       __ATOMIC_RELEASE)
+
+/* Atomic exchange (without compare).  */
+
+#define __arch_exchange_8_int(mem, newval, model) \
+  __atomic_exchange_n (mem, newval, model)
+
+#define __arch_exchange_16_int(mem, newval, model) \
+  __atomic_exchange_n (mem, newval, model)
+
+#define __arch_exchange_32_int(mem, newval, model) \
+  __atomic_exchange_n (mem, newval, model)
+
+#define __arch_exchange_64_int(mem, newval, model) \
+  __atomic_exchange_n (mem, newval, model)
+
+#define atomic_exchange_acq(mem, value) \
+  __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_ACQUIRE)
+
+#define atomic_exchange_rel(mem, value) \
+  __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_RELEASE)
+
+/* Atomically add value and return the previous (unincremented) value.  */
+
+#define __arch_exchange_and_add_8_int(mem, value, model) \
+  __atomic_fetch_add (mem, value, model)
+
+#define __arch_exchange_and_add_16_int(mem, value, model) \
+  __atomic_fetch_add (mem, value, model)
+
+#define __arch_exchange_and_add_32_int(mem, value, model) \
+  __atomic_fetch_add (mem, value, model)
+
+#define __arch_exchange_and_add_64_int(mem, value, model) \
+  __atomic_fetch_add (mem, value, model)
+
+#define atomic_exchange_and_add_acq(mem, value) \
+  __atomic_val_bysize (__arch_exchange_and_add, int, mem, value, \
+		       __ATOMIC_ACQUIRE)
+
+#define atomic_exchange_and_add_rel(mem, value) \
+  __atomic_val_bysize (__arch_exchange_and_add, int, mem, value, \
+		       __ATOMIC_RELEASE)
+
+#endif /* bits/atomic.h */