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-rw-r--r--arch/sh/include/asm/futex-llsc.h42
1 files changed, 42 insertions, 0 deletions
diff --git a/arch/sh/include/asm/futex-llsc.h b/arch/sh/include/asm/futex-llsc.h
new file mode 100644
index 000000000..6e1570752
--- /dev/null
+++ b/arch/sh/include/asm/futex-llsc.h
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_SH_FUTEX_LLSC_H
+#define __ASM_SH_FUTEX_LLSC_H
+
+static inline int atomic_futex_op_cmpxchg_inatomic(u32 *uval,
+ u32 __user *uaddr,
+ u32 oldval, u32 newval)
+{
+ int err = 0;
+ __asm__ __volatile__(
+ "synco\n"
+ "1:\n\t"
+ "movli.l @%2, r0\n\t"
+ "mov r0, %1\n\t"
+ "cmp/eq %1, %4\n\t"
+ "bf 2f\n\t"
+ "mov %5, r0\n\t"
+ "movco.l r0, @%2\n\t"
+ "bf 1b\n"
+ "2:\n\t"
+ "synco\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" (*uval)
+ :"r" (uaddr), "i" (-EFAULT), "r" (oldval), "r" (newval)
+ :"t", "memory", "r0");
+ if (err) return err;
+ return 0;
+}
+
+#endif /* __ASM_SH_FUTEX_LLSC_H */