WIP

FossilOrigin-Name: 50c6fcb1c1758fb6252c48df702f81c626389bcc

1 files changed, 58 insertions, 0 deletions

diff --git a/src/u_utils.S b/src/u_utils.S
new file mode 100644
index 0000000..a460701
--- /dev/null
+++ b/src/u_utils.S
@@ -0,0 +1,58 @@
+/*
+ * ========================
+ * =====    ===============
+ * ======  ================
+ * ======  ================
+ * ======  ====   ====   ==
+ * ======  ===     ==  =  =
+ * ======  ===  =  ==     =
+ * =  ===  ===  =  ==  ====
+ * =  ===  ===  =  ==  =  =
+ * ==     =====   ====   ==
+ * ========================
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 2022 Joe
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the organization nor the
+ *    names of its contributors may be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JOE ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL JOE BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * asm-cgi-example: src/u_utils.S
+ * Sun May 22 18:12:26 CEST 2022
+ * Joe
+ */
+
+.text
+.globl u_strlen
+
+u_strlen:
+	movq    $-1, %rax
+	pushq	%rdi
+loop:
+	addq    $0x1, %rax
+	cmpb    $0x0, (%rdi)
+	leaq    1(%rdi), %rdi
+	jne     loop
+	popq	%rdi
+	retq