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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_S390_FUTEX_H
#define _ASM_S390_FUTEX_H

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

#define __futex_atomic_op(insn, ret, oldval, newval, uaddr, oparg)    \
    asm volatile(                            \
        "   sacf  256\n"                    \
        "0: l     %1,0(%6)\n"                    \
        "1:"insn                        \
        "2: cs    %1,%2,0(%6)\n"                \
        "3: jl    1b\n"                        \
        "   lhi   %0,0\n"                    \
        "4: sacf  768\n"                    \
        EX_TABLE(0b,4b) EX_TABLE(2b,4b) EX_TABLE(3b,4b)        \
        : "=d" (ret), "=&d" (oldval), "=&d" (newval),        \
          "=m" (*uaddr)                        \
        : "0" (-EFAULT), "d" (oparg), "a" (uaddr),        \
          "m" (*uaddr) : "cc");

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

    switch (op) {
    case FUTEX_OP_SET:
        __futex_atomic_op("lr %2,%5\n",
                  ret, oldval, newval, uaddr, oparg);
        break;
    case FUTEX_OP_ADD:
        __futex_atomic_op("lr %2,%1\nar %2,%5\n",
                  ret, oldval, newval, uaddr, oparg);
        break;
    case FUTEX_OP_OR:
        __futex_atomic_op("lr %2,%1\nor %2,%5\n",
                  ret, oldval, newval, uaddr, oparg);
        break;
    case FUTEX_OP_ANDN:
        __futex_atomic_op("lr %2,%1\nnr %2,%5\n",
                  ret, oldval, newval, uaddr, oparg);
        break;
    case FUTEX_OP_XOR:
        __futex_atomic_op("lr %2,%1\nxr %2,%5\n",
                  ret, oldval, newval, uaddr, oparg);
        break;
    default:
        ret = -ENOSYS;
    }

    if (!ret)
        *oval = oldval;

    return ret;
}

static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
                        u32 oldval, u32 newval)
{
    int ret;

    asm volatile(
        "   sacf 256\n"
        "0: cs   %1,%4,0(%5)\n"
        "1: la   %0,0\n"
        "2: sacf 768\n"
        EX_TABLE(0b,2b) EX_TABLE(1b,2b)
        : "=d" (ret), "+d" (oldval), "=m" (*uaddr)
        : "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr)
        : "cc", "memory");
    *uval = oldval;
    return ret;
}

#endif /* _ASM_S390_FUTEX_H */

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