From: "Jonathan S. Shapiro" <shap@eros-os.com>
To: Ramana Radhakrishnan <ramana.r@gmail.com>
Cc: binutils <binutils@sources.redhat.com>
Subject: Re: Link start address
Date: Fri, 03 Aug 2007 17:44:00 -0000 [thread overview]
Message-ID: <1186163057.23564.130.camel@shap.om-md.eros-os.com> (raw)
In-Reply-To: <67ea2eb0708031030v4e016671gf976815459a55cbc@mail.gmail.com>
On Fri, 2007-08-03 at 23:00 +0530, Ramana Radhakrishnan wrote:
> Redirecting it there ...
>
> On 8/3/07, Jonathan S. Shapiro <shap@eros-os.com> wrote:
> > This is probably a question that should be directed to the binutils
> > list.
> >
> > We need to set the default link start address used by ld. Unfortunately
> > ld doesn't have a nice porting guide like GCC does. :-)
>
> Look at emulparams/*.sh and scriptempl/*.sc in the ld directory in
> binutils sources. You would need to set up TEXT_START_ADDRESS
> depending on your target to the correct address. Its a bunch of shell
> scripts that run to generate the default linker script and the
> corresponding start addresses.
Isn't TEXT_START_ADDRESS the same as the address specified by the -Ttext
option? If so, this is not sufficient. It causes the text section to
move, but it does not cause the following sections (data, bss) to be
adjusted. What I am looking for is a simple way to lower all of them.
I will look at the places you mention.
>
> If you were however writing your own standalone linker script you'd do a
> . = <startaddress> in your linker script.
Yes. That I knew about.
> > Actually, we need to choose one of two possible start addresses based on
> > command line options to GCC, and I am wondering if this may make things
> > more complicated.
>
> You might want to have different linker options chosen - you could
> have different emul targets depending on the command line option you
> choose. You can control this using LINK_SPEC in the gcc driver .
>
> hope this helps
I was really hoping to avoid multiple emul targets, but I suppose that I
should look at that. :-(
Thanks again.
shap
next prev parent reply other threads:[~2007-08-03 17:44 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1186161144.23564.126.camel@shap.om-md.eros-os.com>
2007-08-03 17:30 ` Ramana Radhakrishnan
2007-08-03 17:44 ` Jonathan S. Shapiro [this message]
2007-08-03 23:12 ` Ian Lance Taylor
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=1186163057.23564.130.camel@shap.om-md.eros-os.com \
--to=shap@eros-os.com \
--cc=binutils@sources.redhat.com \
--cc=ramana.r@gmail.com \
/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).