[linux-2.6-block.git] / arch / sh / include / asm / futex.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_SH_FUTEX_H
#define __ASM_SH_FUTEX_H

#ifdef __KERNEL__

#include <linux/futex.h>
#include <linux/uaccess.h>
#include <asm/errno.h>

#if !defined(CONFIG_SMP)
#include <asm/futex-irq.h>
#elif defined(CONFIG_CPU_J2)
#include <asm/futex-cas.h>
#elif defined(CONFIG_CPU_SH4A)
#include <asm/futex-llsc.h>
#else
#error SMP not supported on this configuration.
#endif

static inline int
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
			      u32 oldval, u32 newval)
{
	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
		return -EFAULT;

	return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval);
}

static inline int arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval,
		u32 __user *uaddr)
{
	u32 oldval, newval, prev;
	int ret;

	pagefault_disable();

	do {
		ret = get_user(oldval, uaddr);

		if (ret) break;

		switch (op) {
		case FUTEX_OP_SET:
			newval = oparg;
			break;
		case FUTEX_OP_ADD:
			newval = oldval + oparg;
			break;
		case FUTEX_OP_OR:
			newval = oldval | oparg;
			break;
		case FUTEX_OP_ANDN:
			newval = oldval & ~oparg;
			break;
		case FUTEX_OP_XOR:
			newval = oldval ^ oparg;
			break;
		default:
			ret = -ENOSYS;
			break;
		}

		if (ret) break;

		ret = futex_atomic_cmpxchg_inatomic(&prev, uaddr, oldval, newval);
	} while (!ret && prev != oldval);

	pagefault_enable();

	if (!ret)
		*oval = oldval;

	return ret;
}

#endif /* __KERNEL__ */
#endif /* __ASM_SH_FUTEX_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
fc1d4c9c KK	2	#ifndef __ASM_SH_FUTEX_H
fc1d4c9c KK	3	#define __ASM_SH_FUTEX_H
4732efbe	4
fc1d4c9c	5	#ifdef __KERNEL__
4732efbe	6
fc1d4c9c	7	#include <linux/futex.h>
730f412c	8	#include <linux/uaccess.h>
fc1d4c9c	9	#include <asm/errno.h>
fc1d4c9c	10
00b73d8d	11	#if !defined(CONFIG_SMP)
fc1d4c9c	12	#include <asm/futex-irq.h>
00b73d8d RF	13	#elif defined(CONFIG_CPU_J2)
	14	#include <asm/futex-cas.h>
	15	#elif defined(CONFIG_CPU_SH4A)
	16	#include <asm/futex-llsc.h>
	17	#else
	18	#error SMP not supported on this configuration.
	19	#endif
	20
	21	static inline int
	22	futex_atomic_cmpxchg_inatomic(u32 uval, u32 __user uaddr,
	23	u32 oldval, u32 newval)
	24	{
	25	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
	26	return -EFAULT;
	27
	28	return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval);
	29	}
fc1d4c9c	30
30d6e0a4 JS	31	static inline int arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval,
30d6e0a4 JS	32	u32 __user *uaddr)
fc1d4c9c	33	{
00b73d8d RF	34	u32 oldval, newval, prev;
00b73d8d RF	35	int ret;
fc1d4c9c	36
fc1d4c9c KK	37	pagefault_disable();
fc1d4c9c KK	38
00b73d8d	39	do {
9b7e30ab	40	ret = get_user(oldval, uaddr);
00b73d8d RF	41
	42	if (ret) break;
	43
	44	switch (op) {
	45	case FUTEX_OP_SET:
	46	newval = oparg;
	47	break;
	48	case FUTEX_OP_ADD:
	49	newval = oldval + oparg;
	50	break;
	51	case FUTEX_OP_OR:
	52	newval = oldval \| oparg;
	53	break;
	54	case FUTEX_OP_ANDN:
	55	newval = oldval & ~oparg;
	56	break;
	57	case FUTEX_OP_XOR:
	58	newval = oldval ^ oparg;
	59	break;
	60	default:
	61	ret = -ENOSYS;
	62	break;
	63	}
	64
	65	if (ret) break;
	66
	67	ret = futex_atomic_cmpxchg_inatomic(&prev, uaddr, oldval, newval);
	68	} while (!ret && prev != oldval);
fc1d4c9c KK	69
	70	pagefault_enable();
	71
30d6e0a4 JS	72	if (!ret)
30d6e0a4 JS	73	*oval = oldval;
fc1d4c9c KK	74
	75	return ret;
	76	}
	77
fc1d4c9c KK	78	#endif /* __KERNEL__ */
fc1d4c9c KK	79	#endif /* __ASM_SH_FUTEX_H */