1 files changed, 35 insertions, 0 deletions
diff --git a/arch/riscv/lib/strchr.S b/arch/riscv/lib/strchr.S
new file mode 100644
index 000000000..48c3a9da5
--- /dev/null
+++ b/arch/riscv/lib/strchr.S
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/*
+ * Copyright (C) 2025 Feng Jiang <jiangfeng@kylinos.cn>
+ */
+
+#include <linux/linkage.h>
+#include <asm/asm.h>
+
+/* char *strchr(const char *s, int c) */
+SYM_FUNC_START(strchr)
+	/*
+	 * Parameters
+	 *   a0 - The string to be searched
+	 *   a1 - The character to search for
+	 *
+	 * Returns
+	 *   a0 - Address of first occurrence of 'c' or 0
+	 *
+	 * Clobbers
+	 *   t0
+	 */
+	andi	a1, a1, 0xff
+1:
+	lbu	t0, 0(a0)
+	beq	t0, a1, 2f
+	addi	a0, a0, 1
+	bnez	t0, 1b
+	li	a0, 0
+2:
+	ret
+SYM_FUNC_END(strchr)
+
+SYM_FUNC_ALIAS_WEAK(__pi_strchr, strchr)
+EXPORT_SYMBOL(strchr)