From: Matthew Wilcox <willy@debian.org>
To: linux-ia64@vger.kernel.org
Subject: Re: [Linux-ia64] Newbie questions
Date: Fri, 08 Nov 2002 19:01:10 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105590709805370@msgid-missing> (raw)
On Sat, Nov 09, 2002 at 12:21:40AM +0530, CH Gowri Kumar wrote:
> I wrote the above program and compiled it and found the appropriate codes
> for the instructions using objdump -d and wrote the following program
>
> char sc[] ="\x0a"
> "\x10"
> "\x00"
> "\x18\x00\x21\x00\x92\x00\x00\x42\xe0\x11\x00\x20\x84\x0a";
> main()
> {
> void (*fp)(void);
> fp = (void*)sc;
> fp();
> }
>
> But this program on execution gives me the error:
> "Illegal instruction (core dumped)"
> (A similar program for IA-32 worked well.)
function pointers on ia64 are "fat" -- that is, they are not the address
of the function, they are the address of a function descriptor which
contains (iirc) the GP and the address of the function. i believe glibc
pokes around with this kind of thing, so you may wish to look at the
ia64 assembly code in there to see how it does it.
--
Revolutions do not require corporate support.
next reply other threads:[~2002-11-08 19:01 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-08 19:01 Matthew Wilcox [this message]
2002-11-08 19:03 ` [Linux-ia64] Newbie questions CH Gowri Kumar
2002-11-08 19:07 ` Stephane Eranian
2002-11-08 19:09 ` David Mosberger
2002-11-11 2:56 ` Saxena, Sunil
2002-11-11 18:45 ` David Mosberger
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