School Commit Init

2024-08-31 12:07:21 +03:00
commit 0b130ee18c
2801 changed files with 4720552 additions and 0 deletions
@@ -0,0 +1,46 @@
+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 4Fh
+    b dw 8241h
+    c resd 1
+
+; our code starts here
+segment code use32 class=code
+    start:
+        mov ECX,0
+        mov CL,1111_1111b
+        mov EAX,0
+        mov AL,[a]
+        and AL,1111_0000b
+        shl EAX,4
+        or ECX,EAX
+        
+        mov EBX,0
+        mov BX,[b]
+        and EBX, 0000_0011_1111_1100b
+        shl EBX,10
+        or ECX,EBX
+        mov EAX,0
+        mov AL,[a]
+        and AL,0000_1111b
+        shl EAX,20
+        or ECX,EAX
+        mov EAX,0
+        mov AL,[b+1]
+        ror EAX,8
+        or ECX,EAX
+        mov [c],ECX
+    
+        ; exit(0)
+        push    dword 0      ; push the parameter for exit onto the stack
+        call    [exit]       ; call exit to terminate the program
@@ -0,0 +1,42 @@
+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 dw 4A2Fh
+    b dw 8241h
+    c dw 931Dh
+    d resw 1
+
+; our code starts here
+segment code use32 class=code
+    start:
+        mov AX,[a]
+        and AX,0000_0000_0011_1110b
+        shr AX,1
+        
+        mov BX,[b]
+        and BX,0000_0111_1100_0000b
+        shr BX,6
+        
+        mov CX,[c]
+        and CX,1111_1000_0000_0000b
+        shr CX,11
+        
+        mov DX,0
+        add DX,AX
+        add DX,BX
+        add DX,CX
+        mov [d],DX
+        
+        ; exit(0)
+        push    dword 0      ; push the parameter for exit onto the stack
+        call    [exit]       ; call exit to terminate the program