From: Paul Brook <paul@codesourcery.com>
To: qemu-devel@nongnu.org
Cc: Vincent Sanders <vince@simtec.co.uk>
Subject: Re: [Qemu-devel] Add ARM920T to ARM emulation
Date: Fri, 29 May 2009 23:05:28 +0100 [thread overview]
Message-ID: <200905292305.28740.paul@codesourcery.com> (raw)
In-Reply-To: <1243603405-12989-1-git-send-email-vince@simtec.co.uk>
> There was some discussion of the differences between v4 and v5 with
> respect to LDR behaviour manipulating the program counter when the
> bottom bit of an adress is set. The ARM-ARM clearly defines such
> behaviour as "unpredicatble" (section A2.4.3 page 48) where it says
> "In all variants of ARMv4 and ARMv5, bits[1:0] of a value written to
> R15 in ARM state must be 0b00. If they are not, the results are
> UNPREDICTABLE." .
This statement is only applies to instructions that do not have explicit
semantics for r15. Use of r15 as a destination in load/pop instructions is
well defined.
Paul
next prev parent reply other threads:[~2009-05-29 22:05 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-29 13:23 [Qemu-devel] Add ARM920T to ARM emulation Vincent Sanders
2009-05-29 13:23 ` [Qemu-devel] [PATCH 1/1] Update ARM emulation to be version 4t by default Vincent Sanders
2009-05-29 21:59 ` Paul Brook
2009-05-30 10:08 ` Vincent Sanders
2009-05-29 22:05 ` Paul Brook [this message]
2009-06-01 11:35 ` [Qemu-devel] Add ARM920T to ARM emulation Jamie Lokier
2009-06-01 12:13 ` Paul Brook
2009-06-01 13:29 ` Avi Kivity
2009-06-01 13:48 ` Tristan Gingold
2009-06-01 13:58 ` Avi Kivity
2009-06-01 16:34 ` Paul Brook
2009-06-01 23:11 ` Jamie Lokier
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=200905292305.28740.paul@codesourcery.com \
--to=paul@codesourcery.com \
--cc=qemu-devel@nongnu.org \
--cc=vince@simtec.co.uk \
/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.