"Hello world" in assembler

[kenshi]

Since this was requested, I'll make a little "hello world" program in assembler. Note that it's designed for Nasm. Different compilers have subtle differences in syntax.

SEGMENT .data
message db "Hello world."   # our message
db 0Ah
db 0Dh   # return carriage and line feed

SEGMENT .text
mov eax,04h   # eax = 4 for system call to write to file
mov ebx,01h   # file descriptor, in this case 1 for stdout
mov ecx,message   # address of message
mov edx,0Eh   # number of bytes long
int 080h   # call linux
mov eax,0h   # system call to exit
int 080h

[pbharris]

is that x86?

[kenshi]

Yes, of course. I only know the x86 and z80 processors and it's definitely not z80 code.

[cloverm]

Yes, of course. I only know the x86 and z80 processors and it's definitely not z80 code.

Z80, aye? Now that brings back distant memories ... ;D

[ndogg]

Here's the same in MIPS assembly:

 * .text
 * .globl __start
__start:

 * la * $a0, hello
 * li * $v0, 4
 * syscall

 * li * $v0, 10
 * syscall

 * .data
hello: * .asciiz "Hello World!\n"

[pbharris]

Yes, of course. I only know the x86 and z80 processors and it's definitely not z80 code.

how could i have missed that on your resume


pretty cool man.

[kenshi]

So you guys have any questions or want any other examples? This one only uses two commands and is kind of dull.

[Ashcrow]

Where is there a good tutorial on writing assembly for x86 platforms?

[pbharris]

sure - how about moving "Hello World" out through the UART.

[Aragorn]

So you guys have any questions or want any other examples? This one only uses two commands and is kind of dull.

I don't know, maybe I am just a dumb goof, but that looks incredibly hard for such a simple proggy. I need to learn assembly, but it is such a different way of thinking than I am used to...from the looks of it it is obviously going to take a lot of time...

Aragorn