From: Michael Bergandi <mbergandi@gmail.com>
To: eCos Developer List <ecos-devel@ecos.sourceware.org>
Subject: Thread stack alignment requirements for ARM
Date: Thu, 23 Jun 2011 02:37:00 -0000 [thread overview]
Message-ID: <BANLkTinA1-0RC8bVsR4Pp=z+CNKODiizbw@mail.gmail.com> (raw)
Hi all,
I am hoping that someone can share some knowledge on thread stack
alignment requirements for ARM targets and how eCos is handling it.
According to the ARM site, they say that stacks should be 16 byte
aligned. Then, they go on to say that there are a couple ways that
stack alignment requirement can be managed. One of which was if you
are running on an OS and the OS has taken steps to ensure the
requirement is met, then the application need not worry about it. I
don't think I fully understand what this means exactly.
Our particular target is the mx27 (ARM9). Out of habit, we make all
the memory for the thread stacks in our applications 4 byte aligned.
Is this enough? Is it really necessary?
I have found some packages in the kernel (specifically, bsd_tcpip)
that has thread stack memory allocated with no alignment attribute
set. This got me wondering how this all works.
I would love to here from someone with a much better grasp on this.
--
Mike
next reply other threads:[~2011-06-23 2:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-23 2:37 Michael Bergandi [this message]
2011-06-23 7:27 ` Stanislav Meduna
2011-06-23 9:58 ` Nick Garnett
2011-06-23 16:05 ` Michael Bergandi
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='BANLkTinA1-0RC8bVsR4Pp=z+CNKODiizbw@mail.gmail.com' \
--to=mbergandi@gmail.com \
--cc=ecos-devel@ecos.sourceware.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 read-only IMAP folder(s) and NNTP newsgroup(s).