ASM linux helloworld

Sourcecode:（NASM hello.asm）

section .data				;section declaration

msg     db      "Hello, world!",0xa	;our dear string
len     equ     $ - msg                 ;length of our dear string

section .text				;section declaration

;we must export the entry point to the ELF linker or
global _start	;loader. They conventionally recognize _start as their
;entry point. Use ld -e foo to override the default.

_start:

;write our string to stdout

mov     edx,len ;third argument: message length
mov     ecx,msg ;second argument: pointer to message to write
mov     ebx,1   ;first argument: file handle (stdout)
mov     eax,4   ;system call number (sys_write)
int     0x80	;call kernel

;and exit

mov	ebx,0	;first syscall argument: exit code
mov     eax,1   ;system call number (sys_exit)
int     0x80	;call kernel

Ubuntu:编译执行：

nasm -f elf hello.asm

ld --oformat elf32-i386 -m elf_i386 -o hello hello.o

./hello

结果：Hello, world!