From: hp <lx@lxhp.in-berlin.de>
To: ssams <ssams@telkom.net>, linux-assembly@vger.kernel.org
Subject: Re: calculating byte
Date: Thu, 24 Jul 2003 08:54:28 +0100 [thread overview]
Message-ID: <200307240854.28632.lx@lxhp.in-berlin.de> (raw)
In-Reply-To: <web-3860654@b1.c.plasa.com>
ssams am Mittwoch, 23. Juli 2003 23:15:
> hi all
> if u have time, please answer my following question
> i try to learn more about assembly. in a time i'found some
> article that explain about exploit, and i get this
> following code. My question is.. how to calculate byte at
> each line..?
for a rough calculation, as a rule of thumb:
simple opcode 1 byte (very few such opcodes, e.g. push/pop)
opcode w. addressing modifier 2 bytes
mov immediate data + 4 bytes
signed byte displacement + 1 byte
'other' addressing size + 1 byte (16/32bit)
'other' data item size + 1 byte (word/dword)
'exotic operations praefix' + 1byte (e.g. "0F")
hp
--
Linux,Assembly,Forth: http://www.lxhp.in-berlin.de/index-lx.shtml en/de
FAQ(s) + DOCs at http://linuxassembly.org
pse, reply to << lx -at- lxhp -dot- in-berlin -dot- de >>
next prev parent reply other threads:[~2003-07-24 7:54 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-23 22:15 calculating byte ssams
2003-07-24 6:13 ` Anticipating a Reply
2003-07-24 7:54 ` hp [this message]
2003-07-25 13:38 ` switching to real mode? Wolfgang Huber
2003-07-25 16:55 ` hp
2003-07-25 17:20 ` Maciej Hrebien
2003-07-25 19:42 ` switching to real mode Rick A. Hohensee
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