School Commit Init

Anul 1/Semestrul 1/ASC/Homework 2/Additions, subtractions/a,b,c,d - byte/1/main.asm

@@ -0,0 +1,32 @@
+bits 32 ; assembling for the 32 bits architecture
+
+; declare the EntryPoint (a label defining the very first instruction of the program)
+global start        
+
+; declare external functions needed by our program
+extern exit               ; tell nasm that exit exists even if we won't be defining it
+import exit msvcrt.dll    ; exit is a function that ends the calling process. It is defined in msvcrt.dll
+                          ; msvcrt.dll contains exit, printf and all the other important C-runtime specific functions
+
+; our data is declared here (the variables needed by our program)
+segment data use32 class=data
+    ; ...
+    a db 1 
+    b db 2
+    c db 5
+    d db 1
+
+; our code starts here
+segment code use32 class=code
+    start:
+        ; ...
+        mov al,[a]
+        add al, [d]
+        mov bl, [b]
+        add bl, [d]
+        sub [c],al
+        add bl,[c]
+    
+        ; exit(0)
+        push    dword 0      ; push the parameter for exit onto the stack
+        call    [exit]       ; call exit to terminate the program