[urcu.git] / include / urcu / uatomic / x86.h

#ifndef _URCU_ARCH_UATOMIC_X86_H
#define _URCU_ARCH_UATOMIC_X86_H

/*
 * Copyright (c) 1991-1994 by Xerox Corporation.  All rights reserved.
 * Copyright (c) 1996-1999 by Silicon Graphics.  All rights reserved.
 * Copyright (c) 1999-2004 Hewlett-Packard Development Company, L.P.
 * Copyright (c) 2009      Mathieu Desnoyers
 *
 * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
 * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
 *
 * Permission is hereby granted to use or copy this program
 * for any purpose,  provided the above notices are retained on all copies.
 * Permission to modify the code and to distribute modified code is granted,
 * provided the above notices are retained, and a notice that the code was
 * modified is included with the above copyright notice.
 *
 * Code inspired from libuatomic_ops-1.2, inherited in part from the
 * Boehm-Demers-Weiser conservative garbage collector.
 */

#include <urcu/compiler.h>
#include <urcu/system.h>

#define UATOMIC_HAS_ATOMIC_BYTE
#define UATOMIC_HAS_ATOMIC_SHORT

#ifdef __cplusplus
extern "C" {
#endif

/*
 * Derived from AO_compare_and_swap() and AO_test_and_set_full().
 */

struct __uatomic_dummy {
	unsigned long v[10];
};
#define __hp(x)	((struct __uatomic_dummy *)(x))

#define _uatomic_set(addr, v)	((void) CMM_STORE_SHARED(*(addr), (v)))

/* cmpxchg */

static inline __attribute__((always_inline))
unsigned long __uatomic_cmpxchg(void *addr, unsigned long old,
			      unsigned long _new, int len)
{
	switch (len) {
	case 1:
	{
		unsigned char result = old;

		__asm__ __volatile__(
		"lock; cmpxchgb %2, %1"
			: "+a"(result), "+m"(*__hp(addr))
			: "q"((unsigned char)_new)
			: "memory");
		return result;
	}
	case 2:
	{
		unsigned short result = old;

		__asm__ __volatile__(
		"lock; cmpxchgw %2, %1"
			: "+a"(result), "+m"(*__hp(addr))
			: "r"((unsigned short)_new)
			: "memory");
		return result;
	}
	case 4:
	{
		unsigned int result = old;

		__asm__ __volatile__(
		"lock; cmpxchgl %2, %1"
			: "+a"(result), "+m"(*__hp(addr))
			: "r"((unsigned int)_new)
			: "memory");
		return result;
	}
#if (CAA_BITS_PER_LONG == 64)
	case 8:
	{
		unsigned long result = old;

		__asm__ __volatile__(
		"lock; cmpxchgq %2, %1"
			: "+a"(result), "+m"(*__hp(addr))
			: "r"((unsigned long)_new)
			: "memory");
		return result;
	}
#endif
	}
	/*
	 * generate an illegal instruction. Cannot catch this with
	 * linker tricks when optimizations are disabled.
	 */
	__asm__ __volatile__("ud2");
	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))))

/* xchg */

static inline __attribute__((always_inline))
unsigned long __uatomic_exchange(void *addr, unsigned long val, int len)
{
	/* Note: the "xchg" instruction does not need a "lock" prefix. */
	switch (len) {
	case 1:
	{
		unsigned char result;
		__asm__ __volatile__(
		"xchgb %0, %1"
			: "=q"(result), "+m"(*__hp(addr))
			: "0" ((unsigned char)val)
			: "memory");
		return result;
	}
	case 2:
	{
		unsigned short result;
		__asm__ __volatile__(
		"xchgw %0, %1"
			: "=r"(result), "+m"(*__hp(addr))
			: "0" ((unsigned short)val)
			: "memory");
		return result;
	}
	case 4:
	{
		unsigned int result;
		__asm__ __volatile__(
		"xchgl %0, %1"
			: "=r"(result), "+m"(*__hp(addr))
			: "0" ((unsigned int)val)
			: "memory");
		return result;
	}
#if (CAA_BITS_PER_LONG == 64)
	case 8:
	{
		unsigned long result;
		__asm__ __volatile__(
		"xchgq %0, %1"
			: "=r"(result), "+m"(*__hp(addr))
			: "0" ((unsigned long)val)
			: "memory");
		return result;
	}
#endif
	}
	/*
	 * generate an illegal instruction. Cannot catch this with
	 * linker tricks when optimizations are disabled.
	 */
	__asm__ __volatile__("ud2");
	return 0;
}

#define _uatomic_xchg(addr, v)						      \
	((__typeof__(*(addr))) __uatomic_exchange((addr),		      \
						caa_cast_long_keep_sign(v),   \
						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 1:
	{
		unsigned char result = val;

		__asm__ __volatile__(
		"lock; xaddb %1, %0"
			: "+m"(*__hp(addr)), "+q" (result)
			:
			: "memory");
		return result + (unsigned char)val;
	}
	case 2:
	{
		unsigned short result = val;

		__asm__ __volatile__(
		"lock; xaddw %1, %0"
			: "+m"(*__hp(addr)), "+r" (result)
			:
			: "memory");
		return result + (unsigned short)val;
	}
	case 4:
	{
		unsigned int result = val;

		__asm__ __volatile__(
		"lock; xaddl %1, %0"
			: "+m"(*__hp(addr)), "+r" (result)
			:
			: "memory");
		return result + (unsigned int)val;
	}
#if (CAA_BITS_PER_LONG == 64)
	case 8:
	{
		unsigned long result = val;

		__asm__ __volatile__(
		"lock; xaddq %1, %0"
			: "+m"(*__hp(addr)), "+r" (result)
			:
			: "memory");
		return result + (unsigned long)val;
	}
#endif
	}
	/*
	 * generate an illegal instruction. Cannot catch this with
	 * linker tricks when optimizations are disabled.
	 */
	__asm__ __volatile__("ud2");
	return 0;
}

#define _uatomic_add_return(addr, v)					    \
	((__typeof__(*(addr))) __uatomic_add_return((addr),		    \
						caa_cast_long_keep_sign(v), \
						sizeof(*(addr))))

/* uatomic_and */

static inline __attribute__((always_inline))
void __uatomic_and(void *addr, unsigned long val, int len)
{
	switch (len) {
	case 1:
	{
		__asm__ __volatile__(
		"lock; andb %1, %0"
			: "=m"(*__hp(addr))
			: "iq" ((unsigned char)val)
			: "memory");
		return;
	}
	case 2:
	{
		__asm__ __volatile__(
		"lock; andw %1, %0"
			: "=m"(*__hp(addr))
			: "ir" ((unsigned short)val)
			: "memory");
		return;
	}
	case 4:
	{
		__asm__ __volatile__(
		"lock; andl %1, %0"
			: "=m"(*__hp(addr))
			: "ir" ((unsigned int)val)
			: "memory");
		return;
	}
#if (CAA_BITS_PER_LONG == 64)
	case 8:
	{
		__asm__ __volatile__(
		"lock; andq %1, %0"
			: "=m"(*__hp(addr))
			: "er" ((unsigned long)val)
			: "memory");
		return;
	}
#endif
	}
	/*
	 * generate an illegal instruction. Cannot catch this with
	 * linker tricks when optimizations are disabled.
	 */
	__asm__ __volatile__("ud2");
	return;
}

#define _uatomic_and(addr, v)						   \
	(__uatomic_and((addr), caa_cast_long_keep_sign(v), sizeof(*(addr))))

/* uatomic_or */

static inline __attribute__((always_inline))
void __uatomic_or(void *addr, unsigned long val, int len)
{
	switch (len) {
	case 1:
	{
		__asm__ __volatile__(
		"lock; orb %1, %0"
			: "=m"(*__hp(addr))
			: "iq" ((unsigned char)val)
			: "memory");
		return;
	}
	case 2:
	{
		__asm__ __volatile__(
		"lock; orw %1, %0"
			: "=m"(*__hp(addr))
			: "ir" ((unsigned short)val)
			: "memory");
		return;
	}
	case 4:
	{
		__asm__ __volatile__(
		"lock; orl %1, %0"
			: "=m"(*__hp(addr))
			: "ir" ((unsigned int)val)
			: "memory");
		return;
	}
#if (CAA_BITS_PER_LONG == 64)
	case 8:
	{
		__asm__ __volatile__(
		"lock; orq %1, %0"
			: "=m"(*__hp(addr))
			: "er" ((unsigned long)val)
			: "memory");
		return;
	}
#endif
	}
	/*
	 * generate an illegal instruction. Cannot catch this with
	 * linker tricks when optimizations are disabled.
	 */
	__asm__ __volatile__("ud2");
	return;
}

#define _uatomic_or(addr, v)						   \
	(__uatomic_or((addr), caa_cast_long_keep_sign(v), sizeof(*(addr))))

/* uatomic_add */

static inline __attribute__((always_inline))
void __uatomic_add(void *addr, unsigned long val, int len)
{
	switch (len) {
	case 1:
	{
		__asm__ __volatile__(
		"lock; addb %1, %0"
			: "=m"(*__hp(addr))
			: "iq" ((unsigned char)val)
			: "memory");
		return;
	}
	case 2:
	{
		__asm__ __volatile__(
		"lock; addw %1, %0"
			: "=m"(*__hp(addr))
			: "ir" ((unsigned short)val)
			: "memory");
		return;
	}
	case 4:
	{
		__asm__ __volatile__(
		"lock; addl %1, %0"
			: "=m"(*__hp(addr))
			: "ir" ((unsigned int)val)
			: "memory");
		return;
	}
#if (CAA_BITS_PER_LONG == 64)
	case 8:
	{
		__asm__ __volatile__(
		"lock; addq %1, %0"
			: "=m"(*__hp(addr))
			: "er" ((unsigned long)val)
			: "memory");
		return;
	}
#endif
	}
	/*
	 * generate an illegal instruction. Cannot catch this with
	 * linker tricks when optimizations are disabled.
	 */
	__asm__ __volatile__("ud2");
	return;
}

#define _uatomic_add(addr, v)						   \
	(__uatomic_add((addr), caa_cast_long_keep_sign(v), sizeof(*(addr))))


/* uatomic_inc */

static inline __attribute__((always_inline))
void __uatomic_inc(void *addr, int len)
{
	switch (len) {
	case 1:
	{
		__asm__ __volatile__(
		"lock; incb %0"
			: "=m"(*__hp(addr))
			:
			: "memory");
		return;
	}
	case 2:
	{
		__asm__ __volatile__(
		"lock; incw %0"
			: "=m"(*__hp(addr))
			:
			: "memory");
		return;
	}
	case 4:
	{
		__asm__ __volatile__(
		"lock; incl %0"
			: "=m"(*__hp(addr))
			:
			: "memory");
		return;
	}
#if (CAA_BITS_PER_LONG == 64)
	case 8:
	{
		__asm__ __volatile__(
		"lock; incq %0"
			: "=m"(*__hp(addr))
			:
			: "memory");
		return;
	}
#endif
	}
	/* generate an illegal instruction. Cannot catch this with linker tricks
	 * when optimizations are disabled. */
	__asm__ __volatile__("ud2");
	return;
}

#define _uatomic_inc(addr)	(__uatomic_inc((addr), sizeof(*(addr))))

/* uatomic_dec */

static inline __attribute__((always_inline))
void __uatomic_dec(void *addr, int len)
{
	switch (len) {
	case 1:
	{
		__asm__ __volatile__(
		"lock; decb %0"
			: "=m"(*__hp(addr))
			:
			: "memory");
		return;
	}
	case 2:
	{
		__asm__ __volatile__(
		"lock; decw %0"
			: "=m"(*__hp(addr))
			:
			: "memory");
		return;
	}
	case 4:
	{
		__asm__ __volatile__(
		"lock; decl %0"
			: "=m"(*__hp(addr))
			:
			: "memory");
		return;
	}
#if (CAA_BITS_PER_LONG == 64)
	case 8:
	{
		__asm__ __volatile__(
		"lock; decq %0"
			: "=m"(*__hp(addr))
			:
			: "memory");
		return;
	}
#endif
	}
	/*
	 * generate an illegal instruction. Cannot catch this with
	 * linker tricks when optimizations are disabled.
	 */
	__asm__ __volatile__("ud2");
	return;
}

#define _uatomic_dec(addr)	(__uatomic_dec((addr), sizeof(*(addr))))

#if ((CAA_BITS_PER_LONG != 64) && defined(CONFIG_RCU_COMPAT_ARCH))
extern int __rcu_cas_avail;
extern int __rcu_cas_init(void);

#define UATOMIC_COMPAT(insn)							\
	((caa_likely(__rcu_cas_avail > 0))						\
	? (_uatomic_##insn)							\
		: ((caa_unlikely(__rcu_cas_avail < 0)				\
			? ((__rcu_cas_init() > 0)				\
				? (_uatomic_##insn)				\
				: (compat_uatomic_##insn))			\
			: (compat_uatomic_##insn))))

/*
 * We leave the return value so we don't break the ABI, but remove the
 * return value from the API.
 */
extern unsigned long _compat_uatomic_set(void *addr,
					 unsigned long _new, int len);
#define compat_uatomic_set(addr, _new)				     	       \
	((void) _compat_uatomic_set((addr),				       \
				caa_cast_long_keep_sign(_new),		       \
				sizeof(*(addr))))


extern unsigned long _compat_uatomic_xchg(void *addr,
					  unsigned long _new, int len);
#define compat_uatomic_xchg(addr, _new)					       \
	((__typeof__(*(addr))) _compat_uatomic_xchg((addr),		       \
						caa_cast_long_keep_sign(_new), \
						sizeof(*(addr))))

extern unsigned long _compat_uatomic_cmpxchg(void *addr, unsigned long old,
					     unsigned long _new, int len);
#define compat_uatomic_cmpxchg(addr, old, _new)				       \
	((__typeof__(*(addr))) _compat_uatomic_cmpxchg((addr),		       \
						caa_cast_long_keep_sign(old),  \
						caa_cast_long_keep_sign(_new), \
						sizeof(*(addr))))

extern void _compat_uatomic_and(void *addr, unsigned long _new, int len);
#define compat_uatomic_and(addr, v)				       \
	(_compat_uatomic_and((addr),				       \
			caa_cast_long_keep_sign(v),		       \
			sizeof(*(addr))))

extern void _compat_uatomic_or(void *addr, unsigned long _new, int len);
#define compat_uatomic_or(addr, v)				       \
	(_compat_uatomic_or((addr),				       \
			  caa_cast_long_keep_sign(v),		       \
			  sizeof(*(addr))))

extern unsigned long _compat_uatomic_add_return(void *addr,
						unsigned long _new, int len);
#define compat_uatomic_add_return(addr, v)			            \
	((__typeof__(*(addr))) _compat_uatomic_add_return((addr),     	    \
						caa_cast_long_keep_sign(v), \
						sizeof(*(addr))))

#define compat_uatomic_add(addr, v)					       \
		((void)compat_uatomic_add_return((addr), (v)))
#define compat_uatomic_inc(addr)					       \
		(compat_uatomic_add((addr), 1))
#define compat_uatomic_dec(addr)					       \
		(compat_uatomic_add((addr), -1))

#else
#define UATOMIC_COMPAT(insn)	(_uatomic_##insn)
#endif

/* Read is atomic even in compat mode */
#define uatomic_set(addr, v)			\
		UATOMIC_COMPAT(set(addr, v))

#define uatomic_cmpxchg(addr, old, _new)	\
		UATOMIC_COMPAT(cmpxchg(addr, old, _new))
#define uatomic_xchg(addr, v)			\
		UATOMIC_COMPAT(xchg(addr, v))

#define uatomic_and(addr, v)		\
		UATOMIC_COMPAT(and(addr, v))
#define cmm_smp_mb__before_uatomic_and()	cmm_barrier()
#define cmm_smp_mb__after_uatomic_and()		cmm_barrier()

#define uatomic_or(addr, v)		\
		UATOMIC_COMPAT(or(addr, v))
#define cmm_smp_mb__before_uatomic_or()		cmm_barrier()
#define cmm_smp_mb__after_uatomic_or()		cmm_barrier()

#define uatomic_add_return(addr, v)		\
		UATOMIC_COMPAT(add_return(addr, v))

#define uatomic_add(addr, v)	UATOMIC_COMPAT(add(addr, v))
#define cmm_smp_mb__before_uatomic_add()	cmm_barrier()
#define cmm_smp_mb__after_uatomic_add()		cmm_barrier()

#define uatomic_inc(addr)	UATOMIC_COMPAT(inc(addr))
#define cmm_smp_mb__before_uatomic_inc()	cmm_barrier()
#define cmm_smp_mb__after_uatomic_inc()		cmm_barrier()

#define uatomic_dec(addr)	UATOMIC_COMPAT(dec(addr))
#define cmm_smp_mb__before_uatomic_dec()	cmm_barrier()
#define cmm_smp_mb__after_uatomic_dec()		cmm_barrier()

#ifdef __cplusplus
}
#endif

#include <urcu/uatomic/generic.h>

#endif /* _URCU_ARCH_UATOMIC_X86_H */
Commit	Line	Data
ec4e58a3 MD	1	#ifndef _URCU_ARCH_UATOMIC_X86_H
ec4e58a3 MD	2	#define _URCU_ARCH_UATOMIC_X86_H
0114ba7f	3
67ecffc0	4	/*
0114ba7f MD	5	* Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
	6	* Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved.
	7	* Copyright (c) 1999-2004 Hewlett-Packard Development Company, L.P.
	8	* Copyright (c) 2009 Mathieu Desnoyers
	9	*
	10	* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
	11	* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
	12	*
	13	* Permission is hereby granted to use or copy this program
	14	* for any purpose, provided the above notices are retained on all copies.
	15	* Permission to modify the code and to distribute modified code is granted,
	16	* provided the above notices are retained, and a notice that the code was
	17	* modified is included with the above copyright notice.
	18	*
ec4e58a3	19	* Code inspired from libuatomic_ops-1.2, inherited in part from the
0114ba7f MD	20	* Boehm-Demers-Weiser conservative garbage collector.
	21	*/
	22
ec4e58a3	23	#include <urcu/compiler.h>
bf9de1b7	24	#include <urcu/system.h>
0fad128b	25
f469d839 PB	26	#define UATOMIC_HAS_ATOMIC_BYTE
	27	#define UATOMIC_HAS_ATOMIC_SHORT
	28
36bc70a8 MD	29	#ifdef __cplusplus
36bc70a8 MD	30	extern "C" {
67ecffc0	31	#endif
36bc70a8	32
0114ba7f	33	/*
0114ba7f MD	34	* Derived from AO_compare_and_swap() and AO_test_and_set_full().
	35	*/
	36
ec4e58a3	37	struct __uatomic_dummy {
cc1be41b MD	38	unsigned long v[10];
cc1be41b MD	39	};
ec4e58a3	40	#define __hp(x) ((struct __uatomic_dummy *)(x))
cc1be41b	41
424d4ed5	42	#define _uatomic_set(addr, v) ((void) CMM_STORE_SHARED(*(addr), (v)))
0fad128b	43
cc1be41b MD	44	/* cmpxchg */
cc1be41b MD	45
5dba80f9	46	static inline __attribute__((always_inline))
bf9de1b7	47	unsigned long __uatomic_cmpxchg(void *addr, unsigned long old,
0fad128b	48	unsigned long _new, int len)
0114ba7f	49	{
cc1be41b MD	50	switch (len) {
	51	case 1:
	52	{
	53	unsigned char result = old;
0fad128b	54
cc1be41b MD	55	__asm__ __volatile__(
	56	"lock; cmpxchgb %2, %1"
	57	: "+a"(result), "+m"(*__hp(addr))
	58	: "q"((unsigned char)_new)
0114ba7f	59	: "memory");
cc1be41b MD	60	return result;
	61	}
	62	case 2:
	63	{
	64	unsigned short result = old;
0fad128b	65
cc1be41b MD	66	__asm__ __volatile__(
	67	"lock; cmpxchgw %2, %1"
	68	: "+a"(result), "+m"(*__hp(addr))
	69	: "r"((unsigned short)_new)
	70	: "memory");
	71	return result;
	72	}
	73	case 4:
	74	{
	75	unsigned int result = old;
0fad128b	76
cc1be41b MD	77	__asm__ __volatile__(
	78	"lock; cmpxchgl %2, %1"
	79	: "+a"(result), "+m"(*__hp(addr))
	80	: "r"((unsigned int)_new)
	81	: "memory");
	82	return result;
	83	}
e040d717	84	#if (CAA_BITS_PER_LONG == 64)
cc1be41b MD	85	case 8:
cc1be41b MD	86	{
6edb297e	87	unsigned long result = old;
0fad128b	88
cc1be41b	89	__asm__ __volatile__(
2c5e5fb3	90	"lock; cmpxchgq %2, %1"
cc1be41b MD	91	: "+a"(result), "+m"(*__hp(addr))
	92	: "r"((unsigned long)_new)
	93	: "memory");
	94	return result;
	95	}
	96	#endif
	97	}
d0bbd9c2 MD	98	/*
	99	* generate an illegal instruction. Cannot catch this with
	100	* linker tricks when optimizations are disabled.
	101	*/
cc1be41b MD	102	__asm__ __volatile__("ud2");
cc1be41b MD	103	return 0;
0114ba7f MD	104	}
0114ba7f MD	105
bf9de1b7	106	#define _uatomic_cmpxchg(addr, old, _new) \
e56d99bf MD	107	((__typeof__(*(addr))) __uatomic_cmpxchg((addr), \
	108	caa_cast_long_keep_sign(old), \
	109	caa_cast_long_keep_sign(_new),\
cc1be41b MD	110	sizeof(*(addr))))
	111
	112	/* xchg */
0114ba7f	113
5dba80f9	114	static inline __attribute__((always_inline))
bf9de1b7	115	unsigned long __uatomic_exchange(void *addr, unsigned long val, int len)
0114ba7f	116	{
cc1be41b MD	117	/* Note: the "xchg" instruction does not need a "lock" prefix. */
	118	switch (len) {
	119	case 1:
	120	{
	121	unsigned char result;
	122	__asm__ __volatile__(
	123	"xchgb %0, %1"
	124	: "=q"(result), "+m"(*__hp(addr))
	125	: "0" ((unsigned char)val)
	126	: "memory");
	127	return result;
	128	}
	129	case 2:
	130	{
	131	unsigned short result;
	132	__asm__ __volatile__(
	133	"xchgw %0, %1"
	134	: "=r"(result), "+m"(*__hp(addr))
	135	: "0" ((unsigned short)val)
	136	: "memory");
	137	return result;
	138	}
	139	case 4:
	140	{
	141	unsigned int result;
	142	__asm__ __volatile__(
	143	"xchgl %0, %1"
	144	: "=r"(result), "+m"(*__hp(addr))
	145	: "0" ((unsigned int)val)
	146	: "memory");
	147	return result;
	148	}
e040d717	149	#if (CAA_BITS_PER_LONG == 64)
cc1be41b MD	150	case 8:
	151	{
	152	unsigned long result;
	153	__asm__ __volatile__(
0114ba7f	154	"xchgq %0, %1"
cc1be41b MD	155	: "=r"(result), "+m"(*__hp(addr))
cc1be41b MD	156	: "0" ((unsigned long)val)
0114ba7f	157	: "memory");
cc1be41b MD	158	return result;
	159	}
	160	#endif
	161	}
d0bbd9c2 MD	162	/*
	163	* generate an illegal instruction. Cannot catch this with
	164	* linker tricks when optimizations are disabled.
	165	*/
cc1be41b MD	166	__asm__ __volatile__("ud2");
cc1be41b MD	167	return 0;
0114ba7f MD	168	}
0114ba7f MD	169
bf9de1b7	170	#define _uatomic_xchg(addr, v) \
e56d99bf MD	171	((__typeof__(*(addr))) __uatomic_exchange((addr), \
e56d99bf MD	172	caa_cast_long_keep_sign(v), \
cc1be41b MD	173	sizeof(*(addr))))
cc1be41b MD	174
8760d94e	175	/* uatomic_add_return */
0fad128b MD	176
0fad128b MD	177	static inline __attribute__((always_inline))
bf9de1b7	178	unsigned long __uatomic_add_return(void *addr, unsigned long val,
0fad128b MD	179	int len)
	180	{
	181	switch (len) {
	182	case 1:
	183	{
	184	unsigned char result = val;
	185
	186	__asm__ __volatile__(
	187	"lock; xaddb %1, %0"
	188	: "+m"(*__hp(addr)), "+q" (result)
	189	:
	190	: "memory");
	191	return result + (unsigned char)val;
	192	}
	193	case 2:
	194	{
	195	unsigned short result = val;
	196
	197	__asm__ __volatile__(
	198	"lock; xaddw %1, %0"
	199	: "+m"(*__hp(addr)), "+r" (result)
	200	:
	201	: "memory");
	202	return result + (unsigned short)val;
	203	}
	204	case 4:
	205	{
	206	unsigned int result = val;
	207
	208	__asm__ __volatile__(
	209	"lock; xaddl %1, %0"
	210	: "+m"(*__hp(addr)), "+r" (result)
	211	:
	212	: "memory");
	213	return result + (unsigned int)val;
	214	}
e040d717	215	#if (CAA_BITS_PER_LONG == 64)
0fad128b MD	216	case 8:
	217	{
	218	unsigned long result = val;
	219
	220	__asm__ __volatile__(
	221	"lock; xaddq %1, %0"
	222	: "+m"(*__hp(addr)), "+r" (result)
	223	:
	224	: "memory");
	225	return result + (unsigned long)val;
	226	}
	227	#endif
	228	}
d0bbd9c2 MD	229	/*
	230	* generate an illegal instruction. Cannot catch this with
	231	* linker tricks when optimizations are disabled.
	232	*/
0fad128b MD	233	__asm__ __volatile__("ud2");
	234	return 0;
	235	}
	236
e56d99bf MD	237	#define _uatomic_add_return(addr, v) \
	238	((__typeof__(*(addr))) __uatomic_add_return((addr), \
	239	caa_cast_long_keep_sign(v), \
	240	sizeof(*(addr))))
0fad128b	241
bf33aaea PB	242	/* uatomic_and */
	243
	244	static inline __attribute__((always_inline))
	245	void __uatomic_and(void *addr, unsigned long val, int len)
	246	{
	247	switch (len) {
	248	case 1:
	249	{
	250	__asm__ __volatile__(
	251	"lock; andb %1, %0"
	252	: "=m"(*__hp(addr))
	253	: "iq" ((unsigned char)val)
	254	: "memory");
	255	return;
	256	}
	257	case 2:
	258	{
	259	__asm__ __volatile__(
	260	"lock; andw %1, %0"
	261	: "=m"(*__hp(addr))
	262	: "ir" ((unsigned short)val)
	263	: "memory");
	264	return;
	265	}
	266	case 4:
	267	{
	268	__asm__ __volatile__(
	269	"lock; andl %1, %0"
	270	: "=m"(*__hp(addr))
	271	: "ir" ((unsigned int)val)
	272	: "memory");
	273	return;
	274	}
	275	#if (CAA_BITS_PER_LONG == 64)
	276	case 8:
	277	{
	278	__asm__ __volatile__(
	279	"lock; andq %1, %0"
	280	: "=m"(*__hp(addr))
	281	: "er" ((unsigned long)val)
	282	: "memory");
	283	return;
	284	}
	285	#endif
	286	}
d0bbd9c2 MD	287	/*
	288	* generate an illegal instruction. Cannot catch this with
	289	* linker tricks when optimizations are disabled.
	290	*/
bf33aaea PB	291	__asm__ __volatile__("ud2");
	292	return;
	293	}
	294
	295	#define _uatomic_and(addr, v) \
e56d99bf	296	(__uatomic_and((addr), caa_cast_long_keep_sign(v), sizeof(*(addr))))
bf33aaea	297
985b35b1 PB	298	/* uatomic_or */
	299
	300	static inline __attribute__((always_inline))
	301	void __uatomic_or(void *addr, unsigned long val, int len)
	302	{
	303	switch (len) {
	304	case 1:
	305	{
	306	__asm__ __volatile__(
	307	"lock; orb %1, %0"
	308	: "=m"(*__hp(addr))
	309	: "iq" ((unsigned char)val)
	310	: "memory");
	311	return;
	312	}
	313	case 2:
	314	{
	315	__asm__ __volatile__(
	316	"lock; orw %1, %0"
	317	: "=m"(*__hp(addr))
	318	: "ir" ((unsigned short)val)
	319	: "memory");
	320	return;
	321	}
	322	case 4:
	323	{
	324	__asm__ __volatile__(
	325	"lock; orl %1, %0"
	326	: "=m"(*__hp(addr))
	327	: "ir" ((unsigned int)val)
	328	: "memory");
	329	return;
	330	}
	331	#if (CAA_BITS_PER_LONG == 64)
	332	case 8:
	333	{
	334	__asm__ __volatile__(
	335	"lock; orq %1, %0"
	336	: "=m"(*__hp(addr))
	337	: "er" ((unsigned long)val)
	338	: "memory");
	339	return;
	340	}
	341	#endif
	342	}
d0bbd9c2 MD	343	/*
	344	* generate an illegal instruction. Cannot catch this with
	345	* linker tricks when optimizations are disabled.
	346	*/
985b35b1 PB	347	__asm__ __volatile__("ud2");
	348	return;
	349	}
	350
	351	#define _uatomic_or(addr, v) \
e56d99bf	352	(__uatomic_or((addr), caa_cast_long_keep_sign(v), sizeof(*(addr))))
985b35b1	353
8760d94e	354	/* uatomic_add */
0114ba7f	355
5dba80f9	356	static inline __attribute__((always_inline))
bf9de1b7	357	void __uatomic_add(void *addr, unsigned long val, int len)
0114ba7f MD	358	{
0114ba7f MD	359	switch (len) {
cc1be41b MD	360	case 1:
	361	{
	362	__asm__ __volatile__(
	363	"lock; addb %1, %0"
	364	: "=m"(*__hp(addr))
87322fe8 MD	365	: "iq" ((unsigned char)val)
87322fe8 MD	366	: "memory");
cc1be41b MD	367	return;
	368	}
	369	case 2:
	370	{
	371	__asm__ __volatile__(
	372	"lock; addw %1, %0"
	373	: "=m"(*__hp(addr))
87322fe8 MD	374	: "ir" ((unsigned short)val)
87322fe8 MD	375	: "memory");
cc1be41b MD	376	return;
	377	}
	378	case 4:
	379	{
	380	__asm__ __volatile__(
	381	"lock; addl %1, %0"
	382	: "=m"(*__hp(addr))
87322fe8 MD	383	: "ir" ((unsigned int)val)
87322fe8 MD	384	: "memory");
cc1be41b MD	385	return;
cc1be41b MD	386	}
e040d717	387	#if (CAA_BITS_PER_LONG == 64)
cc1be41b MD	388	case 8:
	389	{
	390	__asm__ __volatile__(
	391	"lock; addq %1, %0"
	392	: "=m"(*__hp(addr))
87322fe8 MD	393	: "er" ((unsigned long)val)
87322fe8 MD	394	: "memory");
cc1be41b MD	395	return;
cc1be41b MD	396	}
0114ba7f MD	397	#endif
0114ba7f MD	398	}
d0bbd9c2 MD	399	/*
	400	* generate an illegal instruction. Cannot catch this with
	401	* linker tricks when optimizations are disabled.
	402	*/
0114ba7f	403	__asm__ __volatile__("ud2");
a81b8e5e	404	return;
0114ba7f MD	405	}
0114ba7f MD	406
bf9de1b7	407	#define _uatomic_add(addr, v) \
e56d99bf	408	(__uatomic_add((addr), caa_cast_long_keep_sign(v), sizeof(*(addr))))
0114ba7f	409
2c5e5fb3	410
ec4e58a3	411	/* uatomic_inc */
2c5e5fb3 MD	412
2c5e5fb3 MD	413	static inline __attribute__((always_inline))
bf9de1b7	414	void __uatomic_inc(void *addr, int len)
2c5e5fb3 MD	415	{
	416	switch (len) {
	417	case 1:
	418	{
	419	__asm__ __volatile__(
	420	"lock; incb %0"
	421	: "=m"(*__hp(addr))
	422	:
	423	: "memory");
	424	return;
	425	}
	426	case 2:
	427	{
	428	__asm__ __volatile__(
	429	"lock; incw %0"
	430	: "=m"(*__hp(addr))
	431	:
	432	: "memory");
	433	return;
	434	}
	435	case 4:
	436	{
	437	__asm__ __volatile__(
	438	"lock; incl %0"
	439	: "=m"(*__hp(addr))
	440	:
	441	: "memory");
	442	return;
	443	}
e040d717	444	#if (CAA_BITS_PER_LONG == 64)
2c5e5fb3 MD	445	case 8:
	446	{
	447	__asm__ __volatile__(
	448	"lock; incq %0"
	449	: "=m"(*__hp(addr))
	450	:
	451	: "memory");
	452	return;
	453	}
	454	#endif
	455	}
	456	/* generate an illegal instruction. Cannot catch this with linker tricks
	457	* when optimizations are disabled. */
	458	__asm__ __volatile__("ud2");
	459	return;
	460	}
	461
bf9de1b7	462	#define _uatomic_inc(addr) (__uatomic_inc((addr), sizeof(*(addr))))
2c5e5fb3	463
ec4e58a3	464	/* uatomic_dec */
2c5e5fb3 MD	465
2c5e5fb3 MD	466	static inline __attribute__((always_inline))
bf9de1b7	467	void __uatomic_dec(void *addr, int len)
2c5e5fb3 MD	468	{
	469	switch (len) {
	470	case 1:
	471	{
	472	__asm__ __volatile__(
	473	"lock; decb %0"
	474	: "=m"(*__hp(addr))
	475	:
	476	: "memory");
	477	return;
	478	}
	479	case 2:
	480	{
	481	__asm__ __volatile__(
	482	"lock; decw %0"
	483	: "=m"(*__hp(addr))
	484	:
	485	: "memory");
	486	return;
	487	}
	488	case 4:
	489	{
	490	__asm__ __volatile__(
	491	"lock; decl %0"
	492	: "=m"(*__hp(addr))
	493	:
	494	: "memory");
	495	return;
	496	}
e040d717	497	#if (CAA_BITS_PER_LONG == 64)
2c5e5fb3 MD	498	case 8:
	499	{
	500	__asm__ __volatile__(
	501	"lock; decq %0"
	502	: "=m"(*__hp(addr))
	503	:
	504	: "memory");
	505	return;
	506	}
	507	#endif
	508	}
d0bbd9c2 MD	509	/*
	510	* generate an illegal instruction. Cannot catch this with
	511	* linker tricks when optimizations are disabled.
	512	*/
2c5e5fb3 MD	513	__asm__ __volatile__("ud2");
	514	return;
	515	}
	516
bf9de1b7	517	#define _uatomic_dec(addr) (__uatomic_dec((addr), sizeof(*(addr))))
0114ba7f	518
e040d717	519	#if ((CAA_BITS_PER_LONG != 64) && defined(CONFIG_RCU_COMPAT_ARCH))
02be5561 MD	520	extern int __rcu_cas_avail;
02be5561 MD	521	extern int __rcu_cas_init(void);
bf9de1b7 MD	522
bf9de1b7 MD	523	#define UATOMIC_COMPAT(insn) \
a0b7f7ea	524	((caa_likely(__rcu_cas_avail > 0)) \
bf9de1b7	525	? (_uatomic_##insn) \
a0b7f7ea	526	: ((caa_unlikely(__rcu_cas_avail < 0) \
02be5561	527	? ((__rcu_cas_init() > 0) \
bf9de1b7 MD	528	? (_uatomic_##insn) \
	529	: (compat_uatomic_##insn)) \
	530	: (compat_uatomic_##insn))))
	531
424d4ed5 MD	532	/*
	533	* We leave the return value so we don't break the ABI, but remove the
	534	* return value from the API.
	535	*/
bf9de1b7 MD	536	extern unsigned long _compat_uatomic_set(void *addr,
	537	unsigned long _new, int len);
	538	#define compat_uatomic_set(addr, _new) \
424d4ed5 MD	539	((void) _compat_uatomic_set((addr), \
	540	caa_cast_long_keep_sign(_new), \
	541	sizeof(*(addr))))
bf9de1b7 MD	542
	543
	544	extern unsigned long _compat_uatomic_xchg(void *addr,
	545	unsigned long _new, int len);
	546	#define compat_uatomic_xchg(addr, _new) \
	547	((__typeof__(*(addr))) _compat_uatomic_xchg((addr), \
e56d99bf	548	caa_cast_long_keep_sign(_new), \
bf9de1b7	549	sizeof(*(addr))))
7d413817 MD	550
7d413817 MD	551	extern unsigned long _compat_uatomic_cmpxchg(void *addr, unsigned long old,
bf9de1b7 MD	552	unsigned long _new, int len);
	553	#define compat_uatomic_cmpxchg(addr, old, _new) \
	554	((__typeof__(*(addr))) _compat_uatomic_cmpxchg((addr), \
e56d99bf MD	555	caa_cast_long_keep_sign(old), \
e56d99bf MD	556	caa_cast_long_keep_sign(_new), \
bf9de1b7	557	sizeof(*(addr))))
7d413817	558
8c43fe72	559	extern void _compat_uatomic_and(void *addr, unsigned long _new, int len);
bf33aaea	560	#define compat_uatomic_and(addr, v) \
8c43fe72	561	(_compat_uatomic_and((addr), \
e56d99bf	562	caa_cast_long_keep_sign(v), \
8c43fe72	563	sizeof(*(addr))))
bf33aaea	564
8c43fe72	565	extern void _compat_uatomic_or(void *addr, unsigned long _new, int len);
985b35b1	566	#define compat_uatomic_or(addr, v) \
8c43fe72	567	(_compat_uatomic_or((addr), \
e56d99bf	568	caa_cast_long_keep_sign(v), \
8c43fe72	569	sizeof(*(addr))))
985b35b1	570
28ca843d PB	571	extern unsigned long _compat_uatomic_add_return(void *addr,
28ca843d PB	572	unsigned long _new, int len);
e56d99bf MD	573	#define compat_uatomic_add_return(addr, v) \
	574	((__typeof__(*(addr))) _compat_uatomic_add_return((addr), \
	575	caa_cast_long_keep_sign(v), \
	576	sizeof(*(addr))))
bf9de1b7	577
bf9de1b7 MD	578	#define compat_uatomic_add(addr, v) \
bf9de1b7 MD	579	((void)compat_uatomic_add_return((addr), (v)))
bf9de1b7 MD	580	#define compat_uatomic_inc(addr) \
	581	(compat_uatomic_add((addr), 1))
	582	#define compat_uatomic_dec(addr) \
8760d94e	583	(compat_uatomic_add((addr), -1))
bf9de1b7 MD	584
	585	#else
	586	#define UATOMIC_COMPAT(insn) (_uatomic_##insn)
7d413817 MD	587	#endif
7d413817 MD	588
bf9de1b7	589	/* Read is atomic even in compat mode */
bf9de1b7 MD	590	#define uatomic_set(addr, v) \
bf9de1b7 MD	591	UATOMIC_COMPAT(set(addr, v))
8760d94e	592
bf9de1b7 MD	593	#define uatomic_cmpxchg(addr, old, _new) \
	594	UATOMIC_COMPAT(cmpxchg(addr, old, _new))
	595	#define uatomic_xchg(addr, v) \
	596	UATOMIC_COMPAT(xchg(addr, v))
2812a2d2	597
bf33aaea PB	598	#define uatomic_and(addr, v) \
bf33aaea PB	599	UATOMIC_COMPAT(and(addr, v))
42e83919 MD	600	#define cmm_smp_mb__before_uatomic_and() cmm_barrier()
42e83919 MD	601	#define cmm_smp_mb__after_uatomic_and() cmm_barrier()
2812a2d2	602
985b35b1 PB	603	#define uatomic_or(addr, v) \
985b35b1 PB	604	UATOMIC_COMPAT(or(addr, v))
42e83919 MD	605	#define cmm_smp_mb__before_uatomic_or() cmm_barrier()
42e83919 MD	606	#define cmm_smp_mb__after_uatomic_or() cmm_barrier()
2812a2d2	607
bf9de1b7 MD	608	#define uatomic_add_return(addr, v) \
bf9de1b7 MD	609	UATOMIC_COMPAT(add_return(addr, v))
8760d94e	610
bf9de1b7	611	#define uatomic_add(addr, v) UATOMIC_COMPAT(add(addr, v))
42e83919 MD	612	#define cmm_smp_mb__before_uatomic_add() cmm_barrier()
42e83919 MD	613	#define cmm_smp_mb__after_uatomic_add() cmm_barrier()
2812a2d2	614
bf9de1b7	615	#define uatomic_inc(addr) UATOMIC_COMPAT(inc(addr))
42e83919 MD	616	#define cmm_smp_mb__before_uatomic_inc() cmm_barrier()
42e83919 MD	617	#define cmm_smp_mb__after_uatomic_inc() cmm_barrier()
2812a2d2	618
bf9de1b7	619	#define uatomic_dec(addr) UATOMIC_COMPAT(dec(addr))
42e83919 MD	620	#define cmm_smp_mb__before_uatomic_dec() cmm_barrier()
42e83919 MD	621	#define cmm_smp_mb__after_uatomic_dec() cmm_barrier()
bf9de1b7	622
67ecffc0	623	#ifdef __cplusplus
36bc70a8 MD	624	}
	625	#endif
	626
a2e7bf9c	627	#include <urcu/uatomic/generic.h>
8760d94e	628
ec4e58a3	629	#endif /* _URCU_ARCH_UATOMIC_X86_H */