use atomic instructions for atomics

Signed-off-by: Stafford Horne <shorne@gmail.com>

1 files changed, 92 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/or1k/bits/atomic.h b/libc/sysdeps/linux/or1k/bits/atomic.h
new file mode 100644
index 000000000..233bbdc47
--- /dev/null
+++ b/libc/sysdeps/linux/or1k/bits/atomic.h
@@ -0,0 +1,92 @@
+/* Copyright (C) 2010-2012 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Maxim Kuvyrkov <maxim@codesourcery.com>, 2010.
+
+   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
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _OR1K_BITS_ATOMIC_H
+#define _OR1K_BITS_ATOMIC_H
+
+#include <stdint.h>
+
+typedef int8_t atomic8_t;
+typedef uint8_t uatomic8_t;
+typedef int_fast8_t atomic_fast8_t;
+typedef uint_fast8_t uatomic_fast8_t;
+
+typedef int16_t atomic16_t;
+typedef uint16_t uatomic16_t;
+typedef int_fast16_t atomic_fast16_t;
+typedef uint_fast16_t uatomic_fast16_t;
+
+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 int64_t atomic64_t;
+typedef uint64_t uatomic64_t;
+typedef int_fast64_t atomic_fast64_t;
+typedef uint_fast64_t uatomic_fast64_t;
+
+typedef intptr_t atomicptr_t;
+typedef uintptr_t uatomicptr_t;
+typedef intmax_t atomic_max_t;
+typedef uintmax_t uatomic_max_t;
+
+
+#ifndef atomic_full_barrier
+# define atomic_full_barrier() __asm__ ("" ::: "memory")
+#endif
+
+#ifndef atomic_read_barrier
+# define atomic_read_barrier() atomic_full_barrier ()
+#endif
+
+#ifndef atomic_write_barrier
+# define atomic_write_barrier() atomic_full_barrier ()
+#endif
+
+#define atomic_exchange_acq(mem, newval)                    \
+  ({   __typeof (newval) val;                               \
+                                                            \
+       __asm__ volatile (                                   \
+     		"1:     l.lwa %0, 0(%1)		\n"	    \
+		"       l.swa 0(%1), %2		\n"	    \
+		"	l.bnf 1b		\n"	    \
+		"	 l.nop			\n"	    \
+		: "=&r"(val)				    \
+		: "r"(mem), "r"(newval)			    \
+		: "cc", "memory");			    \
+       val; })
+
+#define atomic_compare_and_exchange_val_acq(mem, newval, oldval)  \
+  ({   __typeof (newval) val;		                    \
+                                                            \
+       __asm__ volatile (                                   \
+       		"1:	l.lwa %0, 0(%1)		\n"	    \
+		"	l.sfeq %0, %2		\n"	    \
+		"	l.bnf 2f		\n"	    \
+		"	 l.nop			\n"	    \
+		"	l.swa 0(%1), %3		\n"	    \
+		"	l.bnf 1b		\n"	    \
+		"	 l.nop			\n"	    \
+		"2:				\n"	    \
+		: "=&r"(val)				    \
+		: "r"(mem), "r"(oldval), "r"(newval)	    \
+		: "cc", "memory");			    \
+       val; })
+
+#endif