[urcu.git] / include / urcu / uatomic / 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@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 */

/*
 * The __hp() macro casts the void pointer @x to a pointer to a structure
 * containing an array of char of the specified size. This allows passing the
 * @addr arguments of the following inline functions as "m" and "+m" operands
 * to the assembly. The @size parameter should be a constant to support
 * compilers such as clang which do not support VLA.
 */

#define __hp(size, x)	((struct { char v[size]; } *)(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(4, addr))
			: "r" (val), MEMOP_IN (__hp(4, 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(8, addr))
			: "r" (val), MEMOP_IN (__hp(8, 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(4, addr))
			: "r" (_new), MEMOP_IN (__hp(4, 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(8, addr))
			: "r" (_new), MEMOP_IN (__hp(8, 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 */
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@efficios.com>
	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	#ifdef __cplusplus
	36	extern "C" {
	37	#endif
	38
	39	#if __GNUC__ > 3 \|\| (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
	40	#define COMPILER_HAVE_SHORT_MEM_OPERAND
	41	#endif
	42
	43	/*
	44	* MEMOP assembler operand rules:
	45	* - op refer to MEMOP_IN operand
	46	* - MEMOP_IN can expand to more than a single operand. Use it at the end of
	47	* operand list only.
	48	*/
	49
	50	#ifdef COMPILER_HAVE_SHORT_MEM_OPERAND
	51
	52	#define MEMOP_OUT(addr) "=Q" (*(addr))
	53	#define MEMOP_IN(addr) "Q" (*(addr))
	54	#define MEMOP_REF(op) #op /* op refer to MEMOP_IN operand */
	55
	56	#else /* !COMPILER_HAVE_SHORT_MEM_OPERAND */
	57
	58	#define MEMOP_OUT(addr) "=m" (*(addr))
	59	#define MEMOP_IN(addr) "a" (addr), "m" (*(addr))
	60	#define MEMOP_REF(op) "0(" #op ")" /* op refer to MEMOP_IN operand */
	61
	62	#endif /* !COMPILER_HAVE_SHORT_MEM_OPERAND */
	63
	64	/*
	65	* The __hp() macro casts the void pointer @x to a pointer to a structure
	66	* containing an array of char of the specified size. This allows passing the
	67	* @addr arguments of the following inline functions as "m" and "+m" operands
	68	* to the assembly. The @size parameter should be a constant to support
	69	* compilers such as clang which do not support VLA.
	70	*/
	71
	72	#define __hp(size, x) ((struct { char v[size]; } *)(x))
	73
	74	/* xchg */
	75
	76	static inline __attribute__((always_inline))
	77	unsigned long _uatomic_exchange(volatile void *addr, unsigned long val, int len)
	78	{
	79	switch (len) {
	80	case 4:
	81	{
	82	unsigned int old_val;
	83
	84	__asm__ __volatile__(
	85	"0: cs %0,%2," MEMOP_REF(%3) "\n"
	86	" brc 4,0b\n"
	87	: "=&r" (old_val), MEMOP_OUT (__hp(4, addr))
	88	: "r" (val), MEMOP_IN (__hp(4, addr))
	89	: "memory", "cc");
	90	return old_val;
	91	}
	92	#if (CAA_BITS_PER_LONG == 64)
	93	case 8:
	94	{
	95	unsigned long old_val;
	96
	97	__asm__ __volatile__(
	98	"0: csg %0,%2," MEMOP_REF(%3) "\n"
	99	" brc 4,0b\n"
	100	: "=&r" (old_val), MEMOP_OUT (__hp(8, addr))
	101	: "r" (val), MEMOP_IN (__hp(8, addr))
	102	: "memory", "cc");
	103	return old_val;
	104	}
	105	#endif
	106	default:
	107	__asm__ __volatile__(".long 0xd00d00");
	108	}
	109
	110	return 0;
	111	}
	112
	113	#define uatomic_xchg(addr, v) \
	114	(__typeof__(*(addr))) _uatomic_exchange((addr), \
	115	caa_cast_long_keep_sign(v), \
	116	sizeof(*(addr)))
	117
	118	/* cmpxchg */
	119
	120	static inline __attribute__((always_inline))
	121	unsigned long _uatomic_cmpxchg(void *addr, unsigned long old,
	122	unsigned long _new, int len)
	123	{
	124	switch (len) {
	125	case 4:
	126	{
	127	unsigned int old_val = (unsigned int)old;
	128
	129	__asm__ __volatile__(
	130	" cs %0,%2," MEMOP_REF(%3) "\n"
	131	: "+r" (old_val), MEMOP_OUT (__hp(4, addr))
	132	: "r" (_new), MEMOP_IN (__hp(4, addr))
	133	: "memory", "cc");
	134	return old_val;
	135	}
	136	#if (CAA_BITS_PER_LONG == 64)
	137	case 8:
	138	{
	139	__asm__ __volatile__(
	140	" csg %0,%2," MEMOP_REF(%3) "\n"
	141	: "+r" (old), MEMOP_OUT (__hp(8, addr))
	142	: "r" (_new), MEMOP_IN (__hp(8, addr))
	143	: "memory", "cc");
	144	return old;
	145	}
	146	#endif
	147	default:
	148	__asm__ __volatile__(".long 0xd00d00");
	149	}
	150
	151	return 0;
	152	}
	153
	154	#define uatomic_cmpxchg(addr, old, _new) \
	155	(__typeof__(*(addr))) _uatomic_cmpxchg((addr), \
	156	caa_cast_long_keep_sign(old), \
	157	caa_cast_long_keep_sign(_new),\
	158	sizeof(*(addr)))
	159
	160	#ifdef __cplusplus
	161	}
	162	#endif
	163
	164	#include <urcu/uatomic/generic.h>
	165
	166	#endif /* _URCU_UATOMIC_ARCH_S390_H */