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| /* SPDX-License-Identifier: GPL-2.0 */
| #ifndef __ASM_SH_FUTEX_CAS_H
| #define __ASM_SH_FUTEX_CAS_H
|
| static inline int atomic_futex_op_cmpxchg_inatomic(u32 *uval,
| u32 __user *uaddr,
| u32 oldval, u32 newval)
| {
| int err = 0;
| __asm__ __volatile__(
| "1:\n\t"
| "cas.l %2, %1, @r0\n"
| "2:\n\t"
| #ifdef CONFIG_MMU
| ".section .fixup,\"ax\"\n"
| "3:\n\t"
| "mov.l 4f, %0\n\t"
| "jmp @%0\n\t"
| " mov %3, %0\n\t"
| ".balign 4\n"
| "4: .long 2b\n\t"
| ".previous\n"
| ".section __ex_table,\"a\"\n\t"
| ".long 1b, 3b\n\t"
| ".previous"
| #endif
| :"+r" (err), "+r" (newval)
| :"r" (oldval), "i" (-EFAULT), "z" (uaddr)
| :"t", "memory");
| if (err) return err;
| *uval = newval;
| return 0;
| }
|
| #endif /* __ASM_SH_FUTEX_CAS_H */
|
|
