Adding membar_xxx defines to userland.

The src/lib/libc/thread/rthread.c 1.8 change adds #include
<sys/atomic.h> in userland code.

Current m88k atomic.h contents are inside of #if defined(_KERNEL)
guard, then, nothing is defined for userland program.
So we need adding some defines to compile it on m88k.

The original diff is suggested from Miod Vallat, modified by the
advice from mpi@ and kettenis@.

ok kettenis@

1 files changed, 49 insertions, 1 deletions

diff --git a/sys/arch/m88k/include/atomic.h b/sys/arch/m88k/include/atomic.h
index cafbada29b2..6ce3c0902d5 100644
--- a/sys/arch/m88k/include/atomic.h
+++ b/sys/arch/m88k/include/atomic.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: atomic.h,v 1.13 2015/07/03 12:47:30 miod Exp $	*/
+/*	$OpenBSD: atomic.h,v 1.14 2018/08/22 11:25:58 aoyama Exp $	*/
 
 /* Public Domain */
 
@@ -151,5 +151,53 @@ __sync_synchronize(void)
 	__asm__ volatile ("tb1 0, %%r0, 0" ::: "memory");
 }
 
+#else /* _KERNEL */
+
+#if !defined(__GNUC__) || (__GNUC__ < 4)
+
+/*
+ * Atomic routines are not available to userland, but we need to prevent
+ * <sys/atomic.h> from declaring them as inline wrappers of __sync_* functions,
+ * which are not available with gcc 3.
+ */
+
+#define	atomic_cas_uint		UNIMPLEMENTED
+#define	atomic_cas_ulong	UNIMPLEMENTED
+#define	atomic_cas_ptr		UNIMPLEMENTED
+
+#define	atomic_swap_uint	UNIMPLEMENTED
+#define	atomic_swap_ulong	UNIMPLEMENTED
+#define	atomic_swap_ptr		UNIMPLEMENTED
+
+#define	atomic_add_int_nv	UNIMPLEMENTED
+#define	atomic_add_long_nv	UNIMPLEMENTED
+#define	atomic_add_int		UNIMPLEMENTED
+#define	atomic_add_long		UNIMPLEMENTED
+
+#define	atomic_inc_int		UNIMPLEMENTED
+#define	atomic_inc_long		UNIMPLEMENTED
+
+#define	atomic_sub_int_nv	UNIMPLEMENTED
+#define	atomic_sub_long_nv	UNIMPLEMENTED
+#define	atomic_sub_int		UNIMPLEMENTED
+#define	atomic_sub_long		UNIMPLEMENTED
+
+#define	atomic_dec_int		UNIMPLEMENTED
+#define	atomic_dec_long		UNIMPLEMENTED
+
+/* trap numbers below 128 would cause a privileged instruction fault */
+#define	__membar() do {						\
+	__asm __volatile("tb1 0, %%r0, 128" ::: "memory");	\
+} while (0)
+
+#endif	/* gcc < 4 */
+
+#define	membar_enter()		__membar()
+#define	membar_exit()		__membar()
+#define	membar_producer()	__membar()
+#define	membar_consumer()	__membar()
+#define	membar_sync()		__membar()
+
 #endif /* defined(_KERNEL) */
+
 #endif /* _M88K_ATOMIC_H_ */