The Meson Build System
http://mesonbuild.com/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
28 lines
835 B
28 lines
835 B
7 years ago
|
; hello.asm a first program for nasm for Linux, Intel, gcc
|
||
|
|
;
|
||
|
|
; assemble: nasm -f elf -l hello.lst hello.asm
|
||
|
|
; link: gcc -o hello hello.o
|
||
|
|
; run: hello
|
||
|
|
; output is: Hello World
|
||
|
|
|
||
|
|
%include "config.asm"
|
||
|
|
|
||
|
|
SECTION .data ; data section
|
||
|
|
msg: db "Hello World",10 ; the string to print, 10=cr
|
||
|
|
len: equ $-msg ; "$" means "here"
|
||
|
|
; len is a value, not an address
|
||
|
|
|
||
|
|
SECTION .text ; code section
|
||
|
|
global main ; make label available to linker
|
||
|
|
main: ; standard gcc entry point
|
||
|
|
|
||
|
|
mov edx,len ; arg3, length of string to print
|
||
|
|
mov ecx,msg ; arg2, pointer to string
|
||
|
|
mov ebx,1 ; arg1, where to write, screen
|
||
|
|
mov eax,4 ; write sysout command to int 80 hex
|
||
|
|
int 0x80 ; interrupt 80 hex, call kernel
|
||
|
|
|
||
|
|
mov ebx,HELLO ; exit code, 0=normal
|
||
|
|
mov eax,1 ; exit command to kernel
|
||
|
|
int 0x80 ; interrupt 80 hex, call kernel
|