hello1, Assembly - rextester

hello1

global _start

section .data
message: db 'hello world',10
linefeed: db 10

section .text
_start:
	;mov rax, 1       ;system call number should be stored in rax
	;mov rdi,1        ;argument #1 in rdi: where to write (descriptor)?
	;mov rsi,message+6  ;argument #2 in rsi: where does the string start?
	;mov rdx,6        ;argument #3 in rdx, how many bytes to write?
	;syscall          ;this instruction invokes a system call
	
	mov rax, 4 ; sys_write
	mov rbx, 1 ;stdout
	mov rcx, message+6 ; print starting from "world"
	mov rdx, 6
	int 80H

;mov rax,1
	;mov rdi,1
	;mov rsi,message
	;mov rdx,5
	;syscall

mov rax, 4 ;sys_write
	mov rbx, 1 ;std_out
	mov rcx, message; print from hello world
	mov rdx, 5 ; print 5 characters?
	int 80H

;mov rax,1
	;mov rdi,1
	;mov rsi,linefeed
	;mov rdx,1
	;syscall
	
	mov rax, 4
	mov rbx, 1
	mov rcx, linefeed ; go to end to put new line at the end of hello
	mov rdx, 1 ; only one character
	int 80H

mov rax,1       ;The system call for exit (sys_exit)
	xor rbx,rbx      ; Exit with return code of 0 (no error)
	int 80H          ;invokes the system call


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