[urcu.git] / urcu / uatomic_arch_s390.h

#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@polymtl.ca>
 *
 * 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>

#ifndef __SIZEOF_LONG__
#ifdef __s390x__
#define __SIZEOF_LONG__ 8
#else
#define __SIZEOF_LONG__ 4
#endif
#endif

#ifndef BITS_PER_LONG
#define BITS_PER_LONG	(__SIZEOF_LONG__ * 8)
#endif

#define uatomic_set(addr, v)	STORE_SHARED(*(addr), (v))
#define uatomic_read(addr)	LOAD_SHARED(*(addr))

/* 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,%1\n"
			"	brc 4,0b\n"
			: "=&r"(old_val), "=m" (*addr)
			: "r"(val), "m" (*addr)
			: "memory", "cc");
		return old_val;
	}
#if (BITS_PER_LONG == 64)
	case 8:
	{
		unsigned long old_val;

		__asm__ __volatile__(
			"0:	csg %0,%2,%1\n"
			"	brc 4,0b\n"
			: "=&r"(old_val), "=m" (*addr)
			: "r"(val), "m" (*addr)
			: "memory", "cc");
		return old_val;
	}
#endif
	default:
		__asm__ __volatile__(".long	0xd00d00");
	}

	return 0;
}

#define uatomic_xchg(addr, v)						    \
	(__typeof__(*(addr))) _uatomic_exchange((addr), (unsigned long)(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,%1\n"
			: "+r"(old_val), "+m"(*addr)
			: "r"(_new)
			: "memory", "cc");
		return old_val;
	}
#if (BITS_PER_LONG == 64)
	case 8:
	{
		__asm__ __volatile__(
			"	csg %0,%2,%1\n"
			: "+r"(old), "+m"(*addr)
			: "r"(_new)
			: "memory", "cc");
		return old;
	}
#endif
	default:
		__asm__ __volatile__(".long	0xd00d00");
	}

	return 0;
}

#define uatomic_cmpxchg(addr, old, _new)				\
	(__typeof__(*(addr))) _uatomic_cmpxchg((addr),			\
					       (unsigned long)(old),	\
					       (unsigned long)(_new),	\
					       sizeof(*(addr)))

/* uatomic_add_return */

static inline __attribute__((always_inline))
unsigned long _uatomic_add_return(void *addr, unsigned long val, int len)
{
	switch (len) {
	case 4:
	{
		unsigned int old, oldt;

		oldt = uatomic_read((unsigned int *)addr);
		do {
			old = oldt;
			oldt = _uatomic_cmpxchg(addr, old, old + val, 4);
		} while (oldt != old);

		return old + val;
	}
#if (BITS_PER_LONG == 64)
	case 8:
	{
		unsigned long old, oldt;

		oldt = uatomic_read((unsigned long *)addr);
		do {
			old = oldt;
			oldt = _uatomic_cmpxchg(addr, old, old + val, 8);
		} while (oldt != old);

		return old + val;
	}
#endif
	}
	__builtin_trap();
	return 0;
}

#define uatomic_add_return(addr, v)					\
	((__typeof__(*(addr))) _uatomic_add_return((addr),		\
						  (unsigned long)(v),	\
						  sizeof(*(addr))))

/* uatomic_sub_return, uatomic_add, uatomic_sub, uatomic_inc, uatomic_dec */

#define uatomic_sub_return(addr, v)	uatomic_add_return((addr), -(v))

#define uatomic_add(addr, v)		(void)uatomic_add_return((addr), (v))
#define uatomic_sub(addr, v)		(void)uatomic_sub_return((addr), (v))

#define uatomic_inc(addr)		uatomic_add((addr), 1)
#define uatomic_dec(addr)		uatomic_add((addr), -1)

#define compat_uatomic_cmpxchg(ptr, old, _new)	uatomic_cmpxchg(ptr, old, _new)

#endif /* _URCU_UATOMIC_ARCH_S390_H */
Commit	Line	Data
	1	#ifndef _URCU_UATOMIC_ARCH_S390_H
	2	#define _URCU_UATOMIC_ARCH_S390_H
	3
	4	/*
	5	* Atomic exchange operations for the S390 architecture. Based on information
	6	* taken from the Principles of Operation Appendix A "Conditional Swapping
	7	* Instructions (CS, CDS)".
	8	*
	9	* Copyright (c) 2009 Novell, Inc.
	10	* Author: Jan Blunck <jblunck@suse.de>
	11	* Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
	12	*
	13	* Permission is hereby granted, free of charge, to any person obtaining a copy
	14	* of this software and associated documentation files (the "Software"), to
	15	* deal in the Software without restriction, including without limitation the
	16	* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
	17	* sell copies of the Software, and to permit persons to whom the Software is
	18	* furnished to do so, subject to the following conditions:
	19	*
	20	* The above copyright notice and this permission notice shall be included in
	21	* all copies or substantial portions of the Software.
	22	*
	23	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	24	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	25	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	26	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	27	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
	28	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
	29	* IN THE SOFTWARE.
	30	*/
	31
	32	#include <urcu/compiler.h>
	33	#include <urcu/system.h>
	34
	35	#ifndef __SIZEOF_LONG__
	36	#ifdef __s390x__
	37	#define __SIZEOF_LONG__ 8
	38	#else
	39	#define __SIZEOF_LONG__ 4
	40	#endif
	41	#endif
	42
	43	#ifndef BITS_PER_LONG
	44	#define BITS_PER_LONG (__SIZEOF_LONG__ * 8)
	45	#endif
	46
	47	#define uatomic_set(addr, v) STORE_SHARED(*(addr), (v))
	48	#define uatomic_read(addr) LOAD_SHARED(*(addr))
	49
	50	/* xchg */
	51
	52	static inline __attribute__((always_inline))
	53	unsigned long _uatomic_exchange(volatile void *addr, unsigned long val, int len)
	54	{
	55	switch (len) {
	56	case 4:
	57	{
	58	unsigned int old_val;
	59
	60	__asm__ __volatile__(
	61	"0: cs %0,%2,%1\n"
	62	" brc 4,0b\n"
	63	: "=&r"(old_val), "=m" (*addr)
	64	: "r"(val), "m" (*addr)
	65	: "memory", "cc");
	66	return old_val;
	67	}
	68	#if (BITS_PER_LONG == 64)
	69	case 8:
	70	{
	71	unsigned long old_val;
	72
	73	__asm__ __volatile__(
	74	"0: csg %0,%2,%1\n"
	75	" brc 4,0b\n"
	76	: "=&r"(old_val), "=m" (*addr)
	77	: "r"(val), "m" (*addr)
	78	: "memory", "cc");
	79	return old_val;
	80	}
	81	#endif
	82	default:
	83	__asm__ __volatile__(".long 0xd00d00");
	84	}
	85
	86	return 0;
	87	}
	88
	89	#define uatomic_xchg(addr, v) \
	90	(__typeof__(*(addr))) _uatomic_exchange((addr), (unsigned long)(v), \
	91	sizeof(*(addr)))
	92
	93	/* cmpxchg */
	94
	95	static inline __attribute__((always_inline))
	96	unsigned long _uatomic_cmpxchg(void *addr, unsigned long old,
	97	unsigned long _new, int len)
	98	{
	99	switch (len) {
	100	case 4:
	101	{
	102	unsigned int old_val = (unsigned int)old;
	103
	104	__asm__ __volatile__(
	105	" cs %0,%2,%1\n"
	106	: "+r"(old_val), "+m"(*addr)
	107	: "r"(_new)
	108	: "memory", "cc");
	109	return old_val;
	110	}
	111	#if (BITS_PER_LONG == 64)
	112	case 8:
	113	{
	114	__asm__ __volatile__(
	115	" csg %0,%2,%1\n"
	116	: "+r"(old), "+m"(*addr)
	117	: "r"(_new)
	118	: "memory", "cc");
	119	return old;
	120	}
	121	#endif
	122	default:
	123	__asm__ __volatile__(".long 0xd00d00");
	124	}
	125
	126	return 0;
	127	}
	128
	129	#define uatomic_cmpxchg(addr, old, _new) \
	130	(__typeof__(*(addr))) _uatomic_cmpxchg((addr), \
	131	(unsigned long)(old), \
	132	(unsigned long)(_new), \
	133	sizeof(*(addr)))
	134
	135	/* uatomic_add_return */
	136
	137	static inline __attribute__((always_inline))
	138	unsigned long _uatomic_add_return(void *addr, unsigned long val, int len)
	139	{
	140	switch (len) {
	141	case 4:
	142	{
	143	unsigned int old, oldt;
	144
	145	oldt = uatomic_read((unsigned int *)addr);
	146	do {
	147	old = oldt;
	148	oldt = _uatomic_cmpxchg(addr, old, old + val, 4);
	149	} while (oldt != old);
	150
	151	return old + val;
	152	}
	153	#if (BITS_PER_LONG == 64)
	154	case 8:
	155	{
	156	unsigned long old, oldt;
	157
	158	oldt = uatomic_read((unsigned long *)addr);
	159	do {
	160	old = oldt;
	161	oldt = _uatomic_cmpxchg(addr, old, old + val, 8);
	162	} while (oldt != old);
	163
	164	return old + val;
	165	}
	166	#endif
	167	}
	168	__builtin_trap();
	169	return 0;
	170	}
	171
	172	#define uatomic_add_return(addr, v) \
	173	((__typeof__(*(addr))) _uatomic_add_return((addr), \
	174	(unsigned long)(v), \
	175	sizeof(*(addr))))
	176
	177	/* uatomic_sub_return, uatomic_add, uatomic_sub, uatomic_inc, uatomic_dec */
	178
	179	#define uatomic_sub_return(addr, v) uatomic_add_return((addr), -(v))
	180
	181	#define uatomic_add(addr, v) (void)uatomic_add_return((addr), (v))
	182	#define uatomic_sub(addr, v) (void)uatomic_sub_return((addr), (v))
	183
	184	#define uatomic_inc(addr) uatomic_add((addr), 1)
	185	#define uatomic_dec(addr) uatomic_add((addr), -1)
	186
	187	#define compat_uatomic_cmpxchg(ptr, old, _new) uatomic_cmpxchg(ptr, old, _new)
	188
	189	#endif /* _URCU_UATOMIC_ARCH_S390_H */