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/* SPDX-License-Identifier: GPL-2.0 */
// Copyright (C) 2005-2017 Andes Technology Corporation

#ifndef __NDS32_FUTEX_H__
#define __NDS32_FUTEX_H__

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

#define __futex_atomic_ex_table(err_reg)            \
    "    .pushsection __ex_table,\"a\"\n"        \
    "    .align    3\n"                    \
    "    .long    1b, 4f\n"                \
    "    .long    2b, 4f\n"                \
    "    .popsection\n"                    \
    "    .pushsection .fixup,\"ax\"\n"            \
    "4:    move    %0, " err_reg "\n"            \
    "    b    3b\n"                    \
    "    .popsection"

#define __futex_atomic_op(insn, ret, oldval, tmp, uaddr, oparg)    \
    smp_mb();                        \
    asm volatile(                    \
    "    movi    $ta, #0\n"                \
    "1:    llw    %1, [%2+$ta]\n"                \
    "    " insn "\n"                    \
    "2:    scw    %0, [%2+$ta]\n"                \
    "    beqz    %0, 1b\n"                \
    "    movi    %0, #0\n"                \
    "3:\n"                            \
    __futex_atomic_ex_table("%4")                \
    : "=&r" (ret), "=&r" (oldval)                \
    : "r" (uaddr), "r" (oparg), "i" (-EFAULT)        \
    : "cc", "memory")
static inline int
futex_atomic_cmpxchg_inatomic(u32 * uval, u32 __user * uaddr,
                  u32 oldval, u32 newval)
{
    int ret = 0;
    u32 val, tmp, flags;

    if (!access_ok(uaddr, sizeof(u32)))
        return -EFAULT;

    smp_mb();
    asm volatile ("       movi    $ta, #0\n"
              "1:     llw     %1, [%6 + $ta]\n"
              "       sub     %3, %1, %4\n"
              "       cmovz   %2, %5, %3\n"
              "       cmovn   %2, %1, %3\n"
              "2:     scw     %2, [%6 + $ta]\n"
              "       beqz    %2, 1b\n"
              "3:\n                   " __futex_atomic_ex_table("%7")
              :"+&r"(ret), "=&r"(val), "=&r"(tmp), "=&r"(flags)
              :"r"(oldval), "r"(newval), "r"(uaddr), "i"(-EFAULT)
              :"$ta", "memory");
    smp_mb();

    *uval = val;
    return ret;
}

static inline int
arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
{
    int oldval = 0, ret;

    if (!access_ok(uaddr, sizeof(u32)))
        return -EFAULT;
    switch (op) {
    case FUTEX_OP_SET:
        __futex_atomic_op("move    %0, %3", ret, oldval, tmp, uaddr,
                  oparg);
        break;
    case FUTEX_OP_ADD:
        __futex_atomic_op("add    %0, %1, %3", ret, oldval, tmp, uaddr,
                  oparg);
        break;
    case FUTEX_OP_OR:
        __futex_atomic_op("or    %0, %1, %3", ret, oldval, tmp, uaddr,
                  oparg);
        break;
    case FUTEX_OP_ANDN:
        __futex_atomic_op("and    %0, %1, %3", ret, oldval, tmp, uaddr,
                  ~oparg);
        break;
    case FUTEX_OP_XOR:
        __futex_atomic_op("xor    %0, %1, %3", ret, oldval, tmp, uaddr,
                  oparg);
        break;
    default:
        ret = -ENOSYS;
    }

    if (!ret)
        *oval = oldval;

    return ret;
}
#endif /* __NDS32_FUTEX_H__ */

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