From 841c5961e089d3fcc065d9b64576579d6b26fc00 Mon Sep 17 00:00:00 2001
From: Johannes Theiner <j.theiner@live.de>
Date: Sun, 30 Dec 2018 14:09:53 +0100
Subject: [PATCH] a5: jetzt fehlen nur noch die Flags

---
 src/c/a5/addsub.asm | 22 +++++++++++++++-------
 src/c/a5/flagtest.c | 40 ++++++++++++++++++++++++++++++++++++----
 2 files changed, 51 insertions(+), 11 deletions(-)

diff --git a/src/c/a5/addsub.asm b/src/c/a5/addsub.asm
index ee81f70..43cc8bc 100644
--- a/src/c/a5/addsub.asm
+++ b/src/c/a5/addsub.asm
@@ -7,7 +7,8 @@ addsub:
     push ebp
     mov ebp, esp
 
-    push bx
+    push ebx
+    push ecx
 
     mov eax, 0
 
@@ -23,11 +24,18 @@ addsub:
 substract: sub ax, word [ebp+12] ;op2
 
 return:
-    pop bx
+
+    pushfd;Flagregister auf Stack pushen
+
+    pop edx;Flagregister in edx schreiben
+
+    ;TODO: Hier wird an die falsche Stelle oder so geschrieben
+    mov [ebp+20], edx;Flagregister aus edx in flags ptr aus C kopieren
+
+
+    pop ecx
+    pop ebx
+
     mov esp, ebp
     pop ebp
-    ret
-
-section .data
-
-operation dw 2
\ No newline at end of file
+    ret
\ No newline at end of file
diff --git a/src/c/a5/flagtest.c b/src/c/a5/flagtest.c
index ec206ec..d7aefa0 100644
--- a/src/c/a5/flagtest.c
+++ b/src/c/a5/flagtest.c
@@ -1,26 +1,58 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+/**
+ *
+ * @param op1 ebp+8
+ * @param op2 ebp+12
+ * @param what ebp+16
+ * @param flags ebp+16
+ * @return
+ */
 extern int addsub(int op1, int op2, char what, unsigned int *flags);
 
 
 int main(int argc, char **argv) {
-    if(argc != 4) {
+    if (argc != 4) {
         printf("Wrong number of arguments\n");
         return -1;
     }
+    if (*argv[2] != '+' && *argv[2] != '-') {
+        printf("Only the operators +/- are supported\n");
+        return -1;
+    }
+
 
     int op1 = atoi(argv[1]);
     int op2 = atoi(argv[3]);
     char what = *argv[2];
 
-    unsigned int * flags = NULL;
+    unsigned int *flags = malloc(32);
 
     int result = addsub(op1, op2, what, flags);
 
+    short signedRes = (short) result;
+    unsigned short unsignedRes = (unsigned short) result;
 
-    printf("%d\n", result);
-    printf("%u\n", result);
+    printf("Flags:\n");
+    printf("O D I T S Z   A   P   C\n");
+    /*
+     * TODO: Interpretation wenn Fehler im ASM behoben
+     * https://stackoverflow.com/a/9361069
+     */
+
+    printf("%d\n\n", *flags);
+    printf("%p\n", flags);
+
+    printf("Ergebnis und Operanden Signed:\n");
+    printf("%d %c %d = %d", op1, what, op2, signedRes);
+
+    printf("\n\n");
+
+    printf("Ergebnis und Operanden Unsigned:\n");
+    printf("%d %c %d = %u", op1, what, op2, unsignedRes);
+
+    printf("\n\n");
 
     return 0;
 }
\ No newline at end of file