1 files changed, 16 insertions, 0 deletions
diff --git a/src/u_strlen.S b/src/u_strlen.S
new file mode 100644
index 0000000..27d9663
--- /dev/null
+++ b/src/u_strlen.S
@@ -0,0 +1,16 @@
+.text
+.globl	u_strlen
+
+u_strlen:
+	movq	%rdi, %rcx
+
+u_loop:
+	cmpb	$0x0, (%rcx)
+	je		u_ret
+	inc		%rcx
+	jmp		u_loop
+
+u_ret:
+	sub		%rdi, %rcx
+	movq	%rcx, %rax
+	retq