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

[Frank K. <fbk...@zy...>]

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>

Might help...

Best,
Frank