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/* 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 {
if (op == FUTEX_OP_SET)
ret = oldval = 0;
else
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 */
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