NPTL: ARC support

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

1 files changed, 57 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/arc/bits/atomic.h b/libc/sysdeps/linux/arc/bits/atomic.h
new file mode 100644
index 000000000..d4abf4eb7
--- /dev/null
+++ b/libc/sysdeps/linux/arc/bits/atomic.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <stdint.h>
+#include <sysdep.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 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;
+
+void __arc_link_error (void);
+
+#define atomic_full_barrier() \
+     __asm__ __volatile__("": : :"memory")
+
+/* Atomic compare and exchange. */
+
+#define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \
+  ({ __arc_link_error (); oldval; })
+
+#define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \
+  ({ __arc_link_error (); oldval; })
+
+#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval)     \
+  ({									\
+	__typeof(oldval) prev;						\
+									\
+	__asm__ __volatile__(						\
+	"1:	llock   %0, [%1]	\n"				\
+	"	brne    %0, %2, 2f	\n"				\
+	"	scond   %3, [%1]	\n"				\
+	"	bnz     1b		\n"				\
+	"2:				\n"				\
+	: "=&r"(prev)							\
+	: "r"(mem), "ir"(oldval),					\
+	  "r"(newval) /* can't be "ir". scond can't take limm for "b" */\
+	: "cc", "memory");						\
+									\
+	prev;								\
+  })
+
+#define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \
+  ({ __arc_link_error (); oldval; })