From 4c63a67fa92c12e092e4911083e8261e242002b7 Mon Sep 17 00:00:00 2001
From: Johannes Theiner <j.theiner@live.de>
Date: Thu, 20 Dec 2018 10:50:51 +0100
Subject: [PATCH] a5: Addition oder Substraktion

---
 src/c/a5/addsub.asm | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/src/c/a5/addsub.asm b/src/c/a5/addsub.asm
index 2842278..06071f1 100644
--- a/src/c/a5/addsub.asm
+++ b/src/c/a5/addsub.asm
@@ -12,11 +12,26 @@ addsub:
 
     mov [ebp-4], word 1
 
-    mov eax,0
-    add ax, word [foo]
+    mov eax, 0
+
+    mov operation, word [ebp+16]
+
     add ax, word [ebp+8]
-    add ax, word [ebp-4]
+
+    cmp operation, 0x2b
+    jne substract
+
+    add ax, word [ebp-12]
+    jmp return
+
+substract: sub ax, word [ebp-12]
+
+return:
 
     mov esp, ebp
     pop ebp
-    ret
\ No newline at end of file
+    ret
+
+section .data
+
+operation dw 2
\ No newline at end of file