From: Michael Matz <matz@suse.de>
To: "H.J. Lu" <hjl.tools@gmail.com>
Cc: Jan Beulich <JBeulich@suse.com>, Binutils <binutils@sourceware.org>
Subject: Re: [committed, PATCH] Remove Disp16|Disp32 from 64-bit direct branches
Date: Wed, 13 May 2015 12:34:00 -0000 [thread overview]
Message-ID: <alpine.LSU.2.20.1505131430230.27315@wotan.suse.de> (raw)
In-Reply-To: <CAMe9rOqECoP=-Bz4neR1LnFsnPO94axMuSpEiOzjmJzbNgA_kA@mail.gmail.com>
Hi,
On Tue, 12 May 2015, H.J. Lu wrote:
> > Well, what do you suggest? Your change is clearly wrong as well.
>
> I won't call it wrong since it implies there is a right.
Of course there is a right. The x86-64 specification is quite clear what
happens with the prefix on jumps. Intel CPUs are simply buggy in not
implementing it. And you're making binutils follow that buggy behaviour.
And that is wrong. The associated bug report is invalid.
> Given that
>
> 0x66 jmp/call rel32
>
> works on Intel processors and crashes on AMD processors.
> I will keep my change in unlessl someone can show a real usage of
>
> 066 jmp/call rel16
>
> on AMD processors.
Huh, what? I must say I'm not very fond of your way of maintaining the
x86-64 binutils.
Ciao,
Michael.
next prev parent reply other threads:[~2015-05-13 12:34 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-11 21:23 H.J. Lu
2015-05-12 10:41 ` Jan Beulich
2015-05-12 11:54 ` H.J. Lu
2015-05-12 12:20 ` Jan Beulich
2015-05-12 12:37 ` H.J. Lu
2015-05-12 13:03 ` Jan Beulich
2015-05-12 13:37 ` H.J. Lu
2015-05-12 13:49 ` Michael Matz
2015-05-12 13:57 ` H.J. Lu
2015-05-12 14:31 ` Michael Matz
2015-05-12 14:49 ` H.J. Lu
2015-05-12 15:14 ` Michael Matz
2015-05-12 15:21 ` H.J. Lu
2015-05-12 15:32 ` Michael Matz
2015-05-12 14:59 ` Jan Beulich
2015-05-12 15:03 ` H.J. Lu
2015-05-12 15:09 ` Jan Beulich
2015-05-12 15:11 ` H.J. Lu
2015-05-12 15:17 ` Jan Beulich
2015-05-12 15:37 ` Michael Matz
2015-05-12 15:43 ` H.J. Lu
2015-05-12 15:47 ` Michael Matz
2015-05-12 16:00 ` H.J. Lu
2015-05-12 16:03 ` Michael Matz
2015-05-12 16:08 ` H.J. Lu
2015-05-13 6:18 ` Jan Beulich
2015-05-13 11:35 ` H.J. Lu
2015-05-13 12:27 ` Jan Beulich
2015-05-13 13:15 ` H.J. Lu
2015-05-13 12:34 ` Michael Matz [this message]
2015-05-13 13:32 ` H.J. Lu
2015-05-13 16:50 ` Maciej W. Rozycki
2015-05-13 16:53 ` H.J. Lu
2015-05-15 6:39 ` Jan Beulich
2015-05-15 16:52 ` H.J. Lu
2015-05-18 7:05 ` Jan Beulich
2015-05-18 11:22 ` H.J. Lu
2015-05-18 11:48 ` Jan Beulich
2015-05-18 12:18 ` H.J. Lu
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=alpine.LSU.2.20.1505131430230.27315@wotan.suse.de \
--to=matz@suse.de \
--cc=JBeulich@suse.com \
--cc=binutils@sourceware.org \
--cc=hjl.tools@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).