testing

README.md

@@ -1,3 +1,3 @@
 # asm
 
-x86 assembly exercises using [asmtutor.com](https://asmtutor.com)
+Build x86_64 assembly examples from [asmtutor.com](https://asmtutor.com)

functions.asm

@@ -1,39 +0,0 @@
-SYS_EXIT    equ 1
-SYS_WRITE   equ 4
-STDOUT      equ 1
-
-strlen:
-    push    ebx
-    mov     ebx, eax
-nextchar:
-    cmp     byte[eax], 0
-    jz      finished
-    inc     eax
-    jmp     nextchar
-finished:
-    sub     eax, ebx
-    pop     ebx
-    ret
-
-print:
-    push    ebx
-    push    ecx
-    push    edx
-
-    mov     ebx, eax
-    call    strlen
-    mov     edx, eax
-    mov     ecx, ebx
-    mov     ebx, STDOUT
-    mov     eax, SYS_WRITE
-    int     0x80
-
-    pop     edx
-    pop     ecx
-    pop     ebx
-    ret
-
-quit:
-    mov     ebx, 0
-    mov     eax, SYS_EXIT
-    int     0x80

helloworld.asm

@@ -1,15 +1,22 @@
-%include        'functions.asm'
+; %include        'functions.asm'
+
+SYS_EXIT    equ 1
+SYS_WRITE   equ 4
+STDOUT      equ 1
 
 section .data
-msg1     db      "Hello, world!", 0x0A, 0x00
-msg2     db      "Display a line of text", 0x0A, 0x00
+msg     db      "Hello, world!", 0Ah
 
 section .text
 global _start
 
 _start:
-    mov     eax, msg1
-    call    print
-    mov     eax, msg2
-    call    print
-    call    quit
+    mov     edx, 14
+    mov     ecx, msg
+    mov     ebx, STDOUT
+    mov     eax, SYS_WRITE
+    int     0x80
+
+    mov     ebx, 0
+    mov     eax, SYS_EXIT
+    int     0x80