Hello World ia32 Assembly

#credits: http://www.ibm.com/developerworks/library/l-ppc/
.data                   # section declaration

msg:
    .string "Hello, world!\n"
    len = . - msg   # length of our dear string

.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

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

# and exit

    movl    $0,%ebx     # first argument: exit code
    movl    $1,%eax     # system call number (sys_exit)
    int     $0x80       # call kernel