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Linux kernel mirror (for testing)
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linux
1#ifndef __ASM_SH_FUTEX_CAS_H
2#define __ASM_SH_FUTEX_CAS_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 "1:\n\t"
11 "cas.l %2, %1, @r0\n"
12 "2:\n\t"
13#ifdef CONFIG_MMU
14 ".section .fixup,\"ax\"\n"
15 "3:\n\t"
16 "mov.l 4f, %0\n\t"
17 "jmp @%0\n\t"
18 " mov %3, %0\n\t"
19 ".balign 4\n"
20 "4: .long 2b\n\t"
21 ".previous\n"
22 ".section __ex_table,\"a\"\n\t"
23 ".long 1b, 3b\n\t"
24 ".previous"
25#endif
26 :"+r" (err), "+r" (newval)
27 :"r" (oldval), "i" (-EFAULT), "z" (uaddr)
28 :"t", "memory");
29 if (err) return err;
30 *uval = newval;
31 return 0;
32}
33
34#endif /* __ASM_SH_FUTEX_CAS_H */