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

   1#ifndef __ASM_SH_FUTEX_LLSC_H
   2#define __ASM_SH_FUTEX_LLSC_H
   3
   4static inline int atomic_futex_op_cmpxchg_inatomic(u32 *uval,
   5                                                   u32 __user *uaddr,
   6                                                   u32 oldval, u32 newval)
   7{
   8        int err = 0;
   9        __asm__ __volatile__(
  10                "synco\n"
  11                "1:\n\t"
  12                "movli.l        @%2, r0\n\t"
  13                "mov    r0, %1\n\t"
  14                "cmp/eq %1, %4\n\t"
  15                "bf     2f\n\t"
  16                "mov    %5, r0\n\t"
  17                "movco.l        r0, @%2\n\t"
  18                "bf     1b\n"
  19                "2:\n\t"
  20                "synco\n\t"
  21#ifdef CONFIG_MMU
  22                ".section       .fixup,\"ax\"\n"
  23                "3:\n\t"
  24                "mov.l  4f, %0\n\t"
  25                "jmp    @%0\n\t"
  26                " mov   %3, %0\n\t"
  27                ".balign        4\n"
  28                "4:     .long   2b\n\t"
  29                ".previous\n"
  30                ".section       __ex_table,\"a\"\n\t"
  31                ".long  1b, 3b\n\t"
  32                ".previous"
  33#endif
  34                :"+r" (err), "=&r" (*uval)
  35                :"r" (uaddr), "i" (-EFAULT), "r" (oldval), "r" (newval)
  36                :"t", "memory", "r0");
  37        if (err) return err;
  38        return 0;
  39}
  40
  41#endif /* __ASM_SH_FUTEX_LLSC_H */
  42