Re: [Nasm-users] can't write argv[0] on stdout - solved

[Holger H. <ha...@gm...>]

On Wed, 19 Aug 2009 13:11:49 -0400
Frank Kotler <fbk...@zy...> wrote:

> H. Peter Anvin wrote:
> > On 08/19/2009 01:48 AM, Holger Hanrath wrote:
> >> On Tue, 18 Aug 2009 21:19:21 +0200
> >> Holger Hanrath <ha...@gm...> wrote:
> >>
> >>
> >> here is the program what that does what i want in native x86_64:
> >>
> > 
> > Yes, but inefficient.
> > 
> >> ; write 3 bytes from argv[0] to stdout
> >> ; syscall numbers from asm/unistd_64.h
> >> stdout		equ	1
> >> write		equ	1
> >> exit		equ	60
> >> 	
> >> 	mov	rax,	write
> > 
> > Small number... you probably want "mov eax,..." instead.
> > 
> > etc.
> 
> Or even:
> 
> push write
> pop rax
> 
> Smaller, if that's the goal, but slower (I think), and it doesn't do 
> much for "readability", IMO.
> 
> There's a tutorial here:
> 
> <http://www.vikaskumar.org/wiki/index.php?title=X86-64_Tutorial>

good link wish i had it earlier

Holger