From: Justinas <justinas@patikimi.lt>
To: siddharth vora <sjv@usc.edu>
Cc: sandeep <sandeep@codito.com>, A M <alim1993@yahoo.com>,
linux-c-programming@vger.kernel.org,
linux-assembly@vger.kernel.org
Subject: Re: Access to Program Counter in C
Date: Fri, 19 Nov 2004 10:03:00 +0200 [thread overview]
Message-ID: <20041119100300.731ff5ed@biesas.adminas.net> (raw)
In-Reply-To: <90db62064205.419d30cd@usc.edu>
On Thu, 18 Nov 2004 23:31:25 -0800
siddharth vora <sjv@usc.edu> wrote:
>
> Try :
>
> Call ($+5)
> pop ebp
yes, something like that.
In x86(DOS) when u do a call to near function(near, that means program don't change a code segment(CS) register) processot does something like this:
mov sp,sp-2
mov [sp],ip (next executable ip)
when call'e ret executed processor does:
mov ip,[sp]
mov sp,sp+2
so, you inscruction after call should be
call <some function>
mov [ipdrr], sp-2
you'll get the IP if this instuction;]
I think u got the idea, look for call inctruction execution inside cpu for more details. I whote here with intension that cpu's word is 2B;]
_
Justinas Gulbinas
justinas@patikimi.lt
next prev parent reply other threads:[~2004-11-19 8:03 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-19 7:31 Access to Program Counter in C siddharth vora
2004-11-19 8:03 ` Justinas [this message]
2004-11-19 8:04 ` sandeep
-- strict thread matches above, loose matches on Subject: below --
2004-11-19 7:58 siddharth vora
2004-11-16 16:38 A M
2004-11-19 6:32 ` sandeep
2004-11-19 11:30 ` Brian Raiter
2004-11-19 16:03 ` Glynn Clements
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