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

#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(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;

        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);

        if (!ret)
                *oval = oldval;

        return ret;
}

#endif /* __ASM_SH_FUTEX_H */