1 files changed, 34 insertions, 0 deletions
diff --git a/arch/arm64/lib/strchr.S b/arch/arm64/lib/strchr.S
new file mode 100644
index 000000000..94ee67a6b
--- /dev/null
+++ b/arch/arm64/lib/strchr.S
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Based on arch/arm/lib/strchr.S
+ *
+ * Copyright (C) 1995-2000 Russell King
+ * Copyright (C) 2013 ARM Ltd.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+/*
+ * Find the first occurrence of a character in a string.
+ *
+ * Parameters:
+ *	x0 - str
+ *	x1 - c
+ * Returns:
+ *	x0 - address of first occurrence of 'c' or 0
+ */
+SYM_FUNC_START(__pi_strchr)
+	and	w1, w1, #0xff
+1:	ldrb	w2, [x0], #1
+	cmp	w2, w1
+	ccmp	w2, wzr, #4, ne
+	b.ne	1b
+	sub	x0, x0, #1
+	cmp	w2, w1
+	csel	x0, x0, xzr, eq
+	ret
+SYM_FUNC_END(__pi_strchr)
+
+SYM_FUNC_ALIAS_WEAK(strchr, __pi_strchr)
+EXPORT_SYMBOL_NOKASAN(strchr)