From: Daniel Jacobowitz <dan@debian.org>
To: Roland McGrath <roland@redhat.com>
Cc: Davide Libenzi <davidel@xmailserver.org>,
Andrew Morton <akpm@osdl.org>, Linus Torvalds <torvalds@osdl.org>,
mingo@redhat.com, cagney@redhat.com,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [RFC PATCH] x86 single-step (TF) vs system calls & traps
Date: Fri, 2 Jul 2004 00:22:08 -0400 [thread overview]
Message-ID: <20040702042208.GA8896@nevyn.them.org> (raw)
In-Reply-To: <200407012159.i61LxKBw022917@magilla.sf.frob.com>
On Thu, Jul 01, 2004 at 02:59:20PM -0700, Roland McGrath wrote:
> > I am not the originator of PTRACE_O_TRACESYSGOOD, I just had the bad
> > luck to touch it.
>
> My apologies.
>
> > I think reporting the system call using 0x80|SIGTRAP when you
> > PTRACE_SINGLESTEP over the trap instruction makes excellent good sense.
>
> If you are not concerned about existing users of PTRACE_O_TRACESYSGOOD
> calling PTRACE_SINGLESTEP and then being confused, then I have no objection.
> I consider you to be the authority on any such users there might be.
>
> In that case, I'm happy to endorse Davide's original patch.
> I will look into extending it to cover x86-64's ia32 support as well.
I don't know of any example users. I'm sure there are a couple
somewhere, though. The new behavior seems intuitively useful to me, so
I'd prefer Davide's original patch.
--
Daniel Jacobowitz
next prev parent reply other threads:[~2004-07-02 4:22 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-29 1:55 [RFC PATCH] x86 single-step (TF) vs system calls & traps Roland McGrath
2004-06-29 2:05 ` Davide Libenzi
2004-06-29 3:42 ` Linus Torvalds
2004-06-29 3:46 ` Roland McGrath
2004-06-29 3:55 ` Linus Torvalds
2004-06-29 4:15 ` Andrew Morton
2004-06-29 4:37 ` Roland McGrath
2004-06-29 7:00 ` Davide Libenzi
2004-07-01 7:47 ` Roland McGrath
2004-07-01 15:14 ` Davide Libenzi
2004-07-01 20:24 ` Roland McGrath
2004-07-01 21:47 ` Davide Libenzi
2004-07-01 20:34 ` Daniel Jacobowitz
2004-07-01 21:59 ` Roland McGrath
2004-07-02 4:22 ` Daniel Jacobowitz [this message]
2004-06-29 4:32 ` Roland McGrath
2004-06-29 5:15 ` Linus Torvalds
2004-07-01 8:09 ` Roland McGrath
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