Hello world added.

Author: IvBaranov

hello/Makefile

@@ -0,0 +1,5 @@
+all:
+	nasm -f macho64 hello.asm
+	ld -macosx_version_min 10.10 -lSystem -o hello hello.o
+clear:
+	rm hello hello.o

hello/hello.asm

@@ -0,0 +1,17 @@
+; Hello world in NASM assembly for Mac OS X x64
+
+section .data
+	msg:    db      "hello", 0xA ; text to print ("hello\n")
+	.len:   equ     $ - msg      ; text length
+
+section .text
+	global _main
+_main:
+	mov     rax, 0x2000004       ; put the write-system-call-code into register rax
+	mov     rdi, 1               ; tell kernel to use stdout
+	mov     rsi, msg             ; put address of the text into register rsi
+	mov     rdx, msg.len         ; put the length of the text into register rdx
+	syscall
+	mov     rax, 0x2000001       ; exit system call
+	mov     rdi, 0               ; out error code 0 to exit successfully
+	syscall