From: Brad Boyer <flar@allandria.com>
To: ashwin tanugula <ashwin.tanugula@gmail.com>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: ptrace and ORIG_EAX on ppc
Date: Tue, 29 Mar 2005 23:25:58 -0800 [thread overview]
Message-ID: <20050330072558.GA13087@pants.nu> (raw)
In-Reply-To: <838f7c50050329170146631318@mail.gmail.com>
On Tue, Mar 29, 2005 at 08:01:06PM -0500, ashwin tanugula wrote:
> Hi!
> Can somebody tell me how to set references to ORIG_EAX in ppc kernel.
> We know ORIG_EAX is defined in unistd.h of i386. How do i make the
> following program print two same pids in ppc?
The ORIG_EAX is a reference to a register as saved in the stack. The
equivalent on ppc would seem to be PT_ORIG_R3. You're digging around
in an area that is extremely non-portable. This program appears to
be messing around with the syscall number before dispatch in the
syscall table. The implementation of ptrace on ppc and ppc64
explicitly does not allow changing this value, so I think you'll need
to find a completely different way to achieve your desired result.
Just to lessen the confusion, what are you trying to accomplish? Not
in the low-level detail sense, but what is the big picture goal?
Brad Boyer
flar@allandria.com
next prev parent reply other threads:[~2005-03-30 7:56 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-30 1:01 ptrace and ORIG_EAX on ppc ashwin tanugula
2005-03-30 7:25 ` Brad Boyer [this message]
2005-03-30 19:15 ` ashwin tanugula
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20050330072558.GA13087@pants.nu \
--to=flar@allandria.com \
--cc=ashwin.tanugula@gmail.com \
--cc=linuxppc-dev@ozlabs.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).