movabs

#
# $  gcc -nostdlib -Wall -shared -fPIC hello_exit.S -Wl,-soname,libhelloexit.so.1,-export-dynamic -o libhelloexit.so.1.0
#
		# .macro
.macro fn name
.global \name
.type   \name, @function
\name:
.endm

		.data
hw:
	.ascii  "Hello, world\n"
	.set    hs, .-hw

		.text
# very usefull function
fn es_hello_world
        # write(1, message, 13)
        movq    $1,  %rax               # system call 1 is write
        movq    $1,  %rdi               # file handle 1 is stdout
        movabs  $hw, %rsi               # address of string to output
        movabs  $hs, %rdx               # number of bytes
        syscall                         # invoke operating system to do the write
        retq                            # go back

fn os_exit
        # exit(0)
        movq    $60, %rax               # system call 60 is exit
        syscall                         # invoke operating system to exit