X-Git-Url: http://git.liburcu.org/?p=userspace-rcu.git;a=blobdiff_plain;f=include%2Furcu%2Fuatomic%2Fs390.h;fp=include%2Furcu%2Fuatomic%2Fs390.h;h=62561e000224ccb4c71e244a239eab5ac730f70b;hp=0000000000000000000000000000000000000000;hb=6893800a4d1cc14dff0395ddcd660a5138db183d;hpb=a59f39055b5ecb77b68cf78b9839aa9e8e4ec332

diff --git a/include/urcu/uatomic/s390.h b/include/urcu/uatomic/s390.h
new file mode 100644
index 0000000..62561e0
--- /dev/null
+++ b/include/urcu/uatomic/s390.h
@@ -0,0 +1,161 @@
+#ifndef _URCU_UATOMIC_ARCH_S390_H
+#define _URCU_UATOMIC_ARCH_S390_H
+
+/*
+ * Atomic exchange operations for the S390 architecture. Based on information
+ * taken from the Principles of Operation Appendix A "Conditional Swapping
+ * Instructions (CS, CDS)".
+ *
+ * Copyright (c) 2009 Novell, Inc.
+ * Author: Jan Blunck <jblunck@suse.de>
+ * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <urcu/compiler.h>
+#include <urcu/system.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
+#define COMPILER_HAVE_SHORT_MEM_OPERAND
+#endif
+
+/*
+ * MEMOP assembler operand rules:
+ * - op refer to MEMOP_IN operand
+ * - MEMOP_IN can expand to more than a single operand. Use it at the end of
+ *   operand list only.
+ */
+
+#ifdef COMPILER_HAVE_SHORT_MEM_OPERAND
+
+#define MEMOP_OUT(addr)	"=Q" (*(addr))
+#define MEMOP_IN(addr)	"Q" (*(addr))
+#define MEMOP_REF(op)	#op		/* op refer to MEMOP_IN operand */
+
+#else /* !COMPILER_HAVE_SHORT_MEM_OPERAND */
+
+#define MEMOP_OUT(addr)	"=m" (*(addr))
+#define MEMOP_IN(addr)	"a" (addr), "m" (*(addr))
+#define MEMOP_REF(op)	"0(" #op ")"	/* op refer to MEMOP_IN operand */
+
+#endif /* !COMPILER_HAVE_SHORT_MEM_OPERAND */
+
+struct __uatomic_dummy {
+	unsigned long v[10];
+};
+#define __hp(x)	((struct __uatomic_dummy *)(x))
+
+/* xchg */
+
+static inline __attribute__((always_inline))
+unsigned long _uatomic_exchange(volatile void *addr, unsigned long val, int len)
+{
+	switch (len) {
+	case 4:
+	{
+		unsigned int old_val;
+
+		__asm__ __volatile__(
+			"0:	cs %0,%2," MEMOP_REF(%3) "\n"
+			"	brc 4,0b\n"
+			: "=&r" (old_val), MEMOP_OUT (__hp(addr))
+			: "r" (val), MEMOP_IN (__hp(addr))
+			: "memory", "cc");
+		return old_val;
+	}
+#if (CAA_BITS_PER_LONG == 64)
+	case 8:
+	{
+		unsigned long old_val;
+
+		__asm__ __volatile__(
+			"0:	csg %0,%2," MEMOP_REF(%3) "\n"
+			"	brc 4,0b\n"
+			: "=&r" (old_val), MEMOP_OUT (__hp(addr))
+			: "r" (val), MEMOP_IN (__hp(addr))
+			: "memory", "cc");
+		return old_val;
+	}
+#endif
+	default:
+		__asm__ __volatile__(".long	0xd00d00");
+	}
+
+	return 0;
+}
+
+#define uatomic_xchg(addr, v)						    \
+	(__typeof__(*(addr))) _uatomic_exchange((addr),			    \
+						caa_cast_long_keep_sign(v), \
+						sizeof(*(addr)))
+
+/* cmpxchg */
+
+static inline __attribute__((always_inline))
+unsigned long _uatomic_cmpxchg(void *addr, unsigned long old,
+			       unsigned long _new, int len)
+{
+	switch (len) {
+	case 4:
+	{
+		unsigned int old_val = (unsigned int)old;
+
+		__asm__ __volatile__(
+			"	cs %0,%2," MEMOP_REF(%3) "\n"
+			: "+r" (old_val), MEMOP_OUT (__hp(addr))
+			: "r" (_new), MEMOP_IN (__hp(addr))
+			: "memory", "cc");
+		return old_val;
+	}
+#if (CAA_BITS_PER_LONG == 64)
+	case 8:
+	{
+		__asm__ __volatile__(
+			"	csg %0,%2," MEMOP_REF(%3) "\n"
+			: "+r" (old), MEMOP_OUT (__hp(addr))
+			: "r" (_new), MEMOP_IN (__hp(addr))
+			: "memory", "cc");
+		return old;
+	}
+#endif
+	default:
+		__asm__ __volatile__(".long	0xd00d00");
+	}
+
+	return 0;
+}
+
+#define uatomic_cmpxchg(addr, old, _new)				     \
+	(__typeof__(*(addr))) _uatomic_cmpxchg((addr),			     \
+					       caa_cast_long_keep_sign(old), \
+					       caa_cast_long_keep_sign(_new),\
+					       sizeof(*(addr)))
+
+#ifdef __cplusplus
+}
+#endif
+
+#include <urcu/uatomic/generic.h>
+
+#endif /* _URCU_UATOMIC_ARCH_S390_H */