stack

[jt]

hello everyone..

int fun()
{
/* anything */
}
int main(void)
{
fun();
}

in this program, when the control is transferred to function fun()..
the return address is pushed to the stack..
Is it possible to access this value..??

[CBFalconer]

Keith Thompson wrote:

CBFalconer <cb********@yah oo.comwrites:

>Harold Aptroot wrote:

>>"CBFalconer " <cb********@yah oo.comwrote in message

... snip ...

>>>>
On this newsgroup, there are no non-standard compliant ways to
do anything. Anything of that nature is off=topic, and may be
found on specialized news-groups dealing with the authors system.

You mean to say that any solution that requires non-standard
compliant code temporarily ceases to exist when talking on this
NG and everyone trying to predend they Do exist will be flamed
for OT-talk? That seems to be happening anyhow

You've got it.

MisterE's reply clearly implied that it cannot be done at all.
Apart from being factually incorrect, his reply was off-topic --
unless you can cite chapter and verse in the ISO C standard to
support his assertion that you can't access a function's return
address *even using non-portable code*.

I disagree. First, there is nothing from MisterE in the quotes
above, so anything he said is not applicable (nor in my earlier
here-quoted messages). I said 'on this newsgroup' and 'specialized
news-groups dealing with'. I then agreed with Mr. Aptroots
non-enthusiastic comment.

The quotation attributions above seem accurate to me.

--
[mail]: Chuck F (cbfalconer at maineline dot net)
[page]: <http://cbfalconer.home .att.net>
Try the download section.

[Chris Dollin]

Richard wrote:

Are you related to Robert Mugabe by any chance?

Any doubts I had about you being a deliberate trouble-maker
have been smashed, burnt, and the smoke thrown into the Sun.

If you thought that was /funny/, I have no hope for you.

--
'It changed the future .. and it changed us.' /Babylon 5/

Hewlett-Packard Limited registered no:
registered office: Cain Road, Bracknell, Berks RG12 1HN 690597 England

[David Thompson]

On 3 Aug 2008 23:50:24 GMT, Chris Torek <no****@torek.n etwrote:

In article <38************ *************** *******@v1g2000 pra.googlegroup s.com>
jt <ka**********@g mail.comwrote:

<snip>

the return address is pushed to the stack..

Actually, it is put in the register "lr" (PPC), "ra" (MIPS), "%o7"
(SPARC), or 14 (IBM S/390; spelled %r14 in GNU assembler). As

S/360,370,390 by convention only; the hardware is equally happy with
any GPR except 0. IIUC zSeries has some new options (insns) also.

others have noted, if fun() is expanded in line, there is no control
transfer at all. But on the VAX and PDP-11, it is indeed placed
on the (hardware) stack.

In PDP-11 it can be pushed, or stored to any of R0 .. R5 and that
register's previous contents pushed (instead). I believe that C on
early-Unix -- around 6/7ed? -- used R5, although if I ever knew why
I've forgotten. (And that's why at most 3 'register' declarations were
effective, using R2..R4, with at least R0&R1 left for expr eval.)

PDP-8 stores it into the first word of the callee routine. But since
the -8 supports at most 48K-octets of storage a conforming C89
implementation would be challenging and C99 out of the question.

- formerly david.thompson1 || achar(64) || worldnet.att.ne t