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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/sh/include/asm/futex.h
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/* SPDX-License-Identifier: GPL-2.0 */

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#ifndef __ASM_SH_FUTEX_H

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#define __ASM_SH_FUTEX_H

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#include <linux/futex.h>

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#include <linux/uaccess.h>

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#include <asm/errno.h>

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#if !defined(CONFIG_SMP)

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#include <asm/futex-irq.h>

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#elif defined(CONFIG_CPU_J2)

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#include <asm/futex-cas.h>

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#elif defined(CONFIG_CPU_SH4A)

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#include <asm/futex-llsc.h>

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#else

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#error SMP not supported on this configuration.

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#endif

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static inline int

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futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,

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			      u32 oldval, u32 newval)

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{

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	if (!access_ok(uaddr, sizeof(u32)))

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		return -EFAULT;

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

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}

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static inline int arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval,

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		u32 __user *uaddr)

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{

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	u32 oldval, newval, prev;

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	int ret;

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	do {

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		ret = get_user(oldval, uaddr);

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		if (ret) break;

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		switch (op) {

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		case FUTEX_OP_SET:

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			newval = oparg;

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			break;

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		case FUTEX_OP_ADD:

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			newval = oldval + oparg;

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			break;

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		case FUTEX_OP_OR:

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			newval = oldval | oparg;

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			break;

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		case FUTEX_OP_ANDN:

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			newval = oldval & ~oparg;

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			break;

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		case FUTEX_OP_XOR:

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			newval = oldval ^ oparg;

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			break;

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		default:

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			ret = -ENOSYS;

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			break;

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		}

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		if (ret) break;

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

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	} while (!ret && prev != oldval);

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	if (!ret)

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		*oval = oldval;

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	return ret;

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}

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#endif /* __ASM_SH_FUTEX_H */

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