xref: /openbmc/linux/arch/sh/include/asm/futex-cas.h (revision b2441318)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_SH_FUTEX_CAS_H
3 #define __ASM_SH_FUTEX_CAS_H
4 
atomic_futex_op_cmpxchg_inatomic(u32 * uval,u32 __user * uaddr,u32 oldval,u32 newval)5 static inline int atomic_futex_op_cmpxchg_inatomic(u32 *uval,
6 						   u32 __user *uaddr,
7 						   u32 oldval, u32 newval)
8 {
9 	int err = 0;
10 	__asm__ __volatile__(
11 		"1:\n\t"
12 		"cas.l	%2, %1, @r0\n"
13 		"2:\n\t"
14 #ifdef CONFIG_MMU
15 		".section	.fixup,\"ax\"\n"
16 		"3:\n\t"
17 		"mov.l	4f, %0\n\t"
18 		"jmp	@%0\n\t"
19 		" mov	%3, %0\n\t"
20 		".balign	4\n"
21 		"4:	.long	2b\n\t"
22 		".previous\n"
23 		".section	__ex_table,\"a\"\n\t"
24 		".long	1b, 3b\n\t"
25 		".previous"
26 #endif
27 		:"+r" (err), "+r" (newval)
28 		:"r" (oldval), "i" (-EFAULT), "z" (uaddr)
29 		:"t", "memory");
30 	if (err) return err;
31 	*uval = newval;
32 	return 0;
33 }
34 
35 #endif /* __ASM_SH_FUTEX_CAS_H */
36