From: Jerry Van Baren <gerald.vanbaren@smiths-aerospace.com>
To: u-boot@lists.denx.de
Subject: [U-Boot-Users] need PPC asm. help. for 83xx watchdog
Date: Fri, 06 Jan 2006 10:36:44 -0500 [thread overview]
Message-ID: <43BE8E8C.3060501@smiths-aerospace.com> (raw)
In-Reply-To: <43BE8B32.1060507@cray.com>
David Updegraff wrote:
> Hi.
>
> Attempting to enable&use watchdog in 8343; but run into Assembler
> (v.2.15) problem in cpu/mpc83xx/start.S:424
> ....
> /* and reset it */
> li r4, 0x556C
> sth r4, SWSRR at l(r3)
> li r4, 0xAA39 <-------- gas barks here, 0xAA39 > 0x8000
> sth r4, SWSRR at l(r3)
>
> which I do not understand, since I thought 'li' was an UNsigned 16bit
> load. I can work around it in a kludgey way with.
>
> lis r4, 0
> ori r4, r4, 0xAA39
> sth r4, SWSRR at l(r3)
>
> but wonder if one you PowerPC assembler gurus could offer better suggestion.
>
> Thanx.
>
> -dbu.
"li" is a simplified mnemonic which is actually "addi" (which
sign-extends the immediate value) according to the "PowerPC
Microprocessor Family: The Programming Environments" Appendix F (p. F-15).
Why gas barks, I'm not quite sure. Probably because it suspects you
wanted it unsigned (which actually is the case - I hate it when tools
are smarter than me).
gvb
next prev parent reply other threads:[~2006-01-06 15:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-06 15:22 [U-Boot-Users] need PPC asm. help. for 83xx watchdog David Updegraff
2006-01-06 15:36 ` Jerry Van Baren [this message]
2006-01-07 11:03 ` Pantelis Antoniou
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=43BE8E8C.3060501@smiths-aerospace.com \
--to=gerald.vanbaren@smiths-aerospace.com \
--cc=u-boot@lists.denx.de \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.