Moving and consolidating repos

x86_64/Basic Mathematic Computations/elementary/addition/add.asm

@@ -0,0 +1,34 @@
+section .data
+    msg db 'Result: ', 0 ; declare string, followed by null terminator
+    newline db 0xA, 0 ; Newline character for format
+section .bss
+    res resb 1 ; reserve 1 byte of memory for storing Result
+section .text
+    global _start ; Define the entry point of the program
+_start:
+    ; Initialize values 
+    mov eax, 4 ; Move the value 4 into register eax
+    mov ebx, 3 ; move the value 3 into register ebx
+    ; Perform the addition
+    add eax, ebx ; add the values of eax n ebx register, store the result in eax 
+    ; Convert the result to ASCII 
+    mov ecx, res ; point ecx to the start of the result buffer
+    add eax, '0' ; convert the result in eax to ASCII
+    mov [ecx], al ; Store the ASCII character in the result buffer
+    mov byte [ecx+1], 0 ; Null terminate the string 
+    ; print the string
+    mov eax, 4 ; Syscall number for sys_write 
+    mov ebx, 1 ; File descripor for stdout 
+    mov ecx, msg ; point to the msg string defined prior
+    mov edx, 8 ; Length of the message storing
+    int 0x80 ; Interrupt to invoke syscall, call the kernel
+    ; print the result
+    mov eax, 4 ; syscall for sys_write
+    mov ebx, 1 ; file desciptor, stdout
+    mov ecx, res ; pointer to the result in memory
+    mov edx, 1 ; length of the result 
+    int 0x80 ; interupt to invoke the systemcall
+    ; exit, cleanly
+    mov eax, 1 ; syscall for sys_exit 
+    xor ebx, ebx ; set ebx to 0 (return)
+    int 0x80 ; interupt to invoke the syscall