LXR linux/arch/sh/include/asm/futex.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef __ASM_SH_FUTEX_H
   3#define __ASM_SH_FUTEX_H
   4
   5#include <linux/futex.h>
   6#include <linux/uaccess.h>
   7#include <asm/errno.h>
   8
   9#if !defined(CONFIG_SMP)
  10#include <asm/futex-irq.h>
  11#elif defined(CONFIG_CPU_J2)
  12#include <asm/futex-cas.h>
  13#elif defined(CONFIG_CPU_SH4A)
  14#include <asm/futex-llsc.h>
  15#else
  16#error SMP not supported on this configuration.
  17#endif
  18
  19static inline int
  20futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
  21                              u32 oldval, u32 newval)
  22{
  23        if (!access_ok(uaddr, sizeof(u32)))
  24                return -EFAULT;
  25
  26        return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval);
  27}
  28
  29static inline int arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval,
  30                u32 __user *uaddr)
  31{
  32        u32 oldval, newval, prev;
  33        int ret;
  34
  35        do {
  36                ret = get_user(oldval, uaddr);
  37
  38                if (ret) break;
  39
  40                switch (op) {
  41                case FUTEX_OP_SET:
  42                        newval = oparg;
  43                        break;
  44                case FUTEX_OP_ADD:
  45                        newval = oldval + oparg;
  46                        break;
  47                case FUTEX_OP_OR:
  48                        newval = oldval | oparg;
  49                        break;
  50                case FUTEX_OP_ANDN:
  51                        newval = oldval & ~oparg;
  52                        break;
  53                case FUTEX_OP_XOR:
  54                        newval = oldval ^ oparg;
  55                        break;
  56                default:
  57                        ret = -ENOSYS;
  58                        break;
  59                }
  60
  61                if (ret) break;
  62
  63                ret = futex_atomic_cmpxchg_inatomic(&prev, uaddr, oldval, newval);
  64        } while (!ret && prev != oldval);
  65
  66        if (!ret)
  67                *oval = oldval;
  68
  69        return ret;
  70}
  71
  72#endif /* __ASM_SH_FUTEX_H */
  73