1 files changed, 35 insertions, 0 deletions
diff --git a/arch/sh/include/asm/futex-cas.h b/arch/sh/include/asm/futex-cas.h
new file mode 100644
index 0000000000..ed738e32b5
--- /dev/null
+++ b/arch/sh/include/asm/futex-cas.h
@@ -0,0 +1,35 @@
+/* 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 */