1 files changed, 14 insertions, 17 deletions
diff --git a/nasm/helloworld.asm b/nasm/helloworld.asm
index 3016f58..48755fb 100755
--- a/nasm/helloworld.asm
+++ b/nasm/helloworld.asm
@@ -1,17 +1,14 @@
-SECTION .data
-msg     db     "Hello World!", 0Ah  ;
-
-SECTION .text
-global _start
-
-_start:
-
-        mov     edx, 13     ; number of bytes to write
-        mov     ecx, msg    ; move memory address of 'msg' to ecx
-        mov     ebx, 1      ; write to the file STDOUT
-        mov     eax, 4      ; invoke SYS_WRITE (kernel opcode 4)
-        int     80h
-
-        mov     ebx, 0      ;
-        mov     eax, 1      ;
-        int     80h
+    global _start
+
+    section .text
+_start:     mov rax, 1      ; system call for write
+            mov rdi, 1      ; file handle 1 is stdout
+            mov rsi, msg    ; address of string to output
+            mov rdx, 13     ; number of bytes
+            syscall         ; invoke operating system to do the write
+            mov rax, 60     ; system call for exit
+            xor rdi, rdi    ; exit code 0;
+            syscall         ; invoke operating system to exit
+
+    section .data
+msg         db  "hello, world",10       ; note the new line at end