From owner-freebsd-hackers  Tue Mar 13  7:23:19 2001
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Date: Tue, 13 Mar 2001 16:29:44 +0100 (CET)
From: milunovic <milunovic@sendmail.ru>
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To: "Nickolay A. Kritsky" <nkritsky@internethelp.ru>
Cc: freebsd-hackers@FreeBSD.ORG
Subject: Re: FreeBSD asm problem
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On Tue, 13 Mar 2001, Nickolay A. Kritsky wrote:

> Hi all!
> It seems to me that you guys are my last hope, but if  i am asking in the
> wrong place - sorry.
> 
> I wrote my first asm program for FreeBSD:
> 
> section    .code
> global _start
> _start:
>     push dword envp
>     push dword argvp
>     push dword fname
>     mov eax,59  ; execve

Here you must push long (dword) because int 0x80 expects EIP

main :
 pushl 3rd
 pushl 2nd
 pushl 1st
 call execve  <--- call will push EIP on stack 

execve :
  leal $0x3b,%eax
  int $0x80

Stack should be ->
    [EIP][1st][2nd][3rd] but instead EIP you can just push anything you
want.

Vojislav Milunovic
milunovic@sendmail.ru

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