mirror of https://lore.kernel.org/lkml/
 help / color / mirror / Atom feed
From: Roland McGrath <roland@redhat.com>
To: Michael Stefaniuc <mstefani@redhat.com>
Cc: prasad@linux.vnet.ibm.com,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Alan Stern <stern@rowland.harvard.edu>,
	linux-kernel@vger.kernel.org,
	Maneesh Soni <maneesh@linux.vnet.ibm.com>,
	Alexandre Julliard <julliard@winehq.org>,
	"Rafael J. Wysocki" <rjw@sisk.pl>,
	Maciej Rutecki <maciej.rutecki@gmail.com>
Subject: Re: Regression in ptrace (Wine) starting with 2.6.33-rc1
Date: Mon, 15 Feb 2010 11:47:24 -0800 (PST)	[thread overview]
Message-ID: <20100215194724.8B5F519@magilla.sf.frob.com> (raw)
In-Reply-To: Michael Stefaniuc's message of  Monday, 15 February 2010 20:37:31 +0100 <4B79A27B.6080607@redhat.com>

> - The other one with 'locally'/'globally' enabled breakpoints.

There is no "local/global" enablement.  That distinction is meaningless
given the way the kernel uses the hardware.  Which of those bits you set
has no material effect on the watchpoint/trap behavior.  

The only regression is in the observed bit pattern read back from dr7.
To be 100% compatible, the hw_breakpoint ptrace-compatibility front-end
should record the state of the useless bits to report back, so the only
differences from the bit pattern written are whatever ones the real
hardware would have shown from writing dr7 and reading it back.


Thanks,
Roland
 

  reply	other threads:[~2010-02-15 19:47 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-02-11 16:33 Michael Stefaniuc
2010-02-11 18:22 ` Frederic Weisbecker
2010-02-11 19:49   ` Michael Stefaniuc
2010-02-12 18:15     ` Frederic Weisbecker
2010-02-13 17:33     ` K.Prasad
2010-02-13 21:29       ` Michael Stefaniuc
2010-02-14 17:15         ` Frederic Weisbecker
2010-02-14 20:13           ` Michael Stefaniuc
2010-02-14 20:41             ` Frederic Weisbecker
2010-02-14 23:05               ` Michael Stefaniuc
2010-02-15 11:57                 ` K.Prasad
2010-02-15 15:57                   ` Alexandre Julliard
2010-02-15 19:37                   ` Michael Stefaniuc
2010-02-15 19:47                     ` Roland McGrath [this message]
2010-02-17 16:03                       ` Frederic Weisbecker
2010-02-17 17:06                 ` Frederic Weisbecker
2010-02-18 17:59                 ` Regression in ptrace (Wine) starting with 2.6.33-rc1, fixes Frederic Weisbecker
2010-02-18 19:27                   ` Michael Stefaniuc
2010-02-18 19:41                     ` Alexandre Julliard
2010-02-19 17:19                       ` Frederic Weisbecker
2010-02-19 17:17                     ` Frederic Weisbecker
2010-02-18 18:00                 ` [PATCH 1/2] hw-breakpoints: Accept breakpoints on NULL address Frederic Weisbecker
2010-02-18 21:16                   ` Roland McGrath
2010-02-19 17:38                     ` Frederic Weisbecker
2010-02-19  8:51                   ` K.Prasad
2010-02-18 18:00                 ` [PATCH 2/2] hw-breakpoint: Keep track of dr7 local enable bits Frederic Weisbecker
2010-02-19  8:45                   ` K.Prasad
2010-02-19 15:34                     ` Frederic Weisbecker
2010-02-19 17:58                       ` K.Prasad
2010-02-19 18:03                         ` Frederic Weisbecker
2010-02-19  8:58                   ` K.Prasad
2010-02-19 15:49                     ` Frederic Weisbecker
2010-02-19 17:41                     ` Frederic Weisbecker
2010-02-19 18:04                       ` K.Prasad
2010-02-19 18:12                         ` [GIT PULL] hw-breakpoint regression fixes Frederic Weisbecker
2010-02-22  9:56                           ` Ingo Molnar
2010-02-19 18:12                         ` [PATCH 1/2] hw-breakpoints: Accept breakpoints on NULL address Frederic Weisbecker
2010-02-19 18:12                         ` [PATCH 2/2] hw-breakpoint: Keep track of dr7 local enable bits Frederic Weisbecker

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=20100215194724.8B5F519@magilla.sf.frob.com \
    --to=roland@redhat.com \
    --cc=fweisbec@gmail.com \
    --cc=julliard@winehq.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=maciej.rutecki@gmail.com \
    --cc=maneesh@linux.vnet.ibm.com \
    --cc=mstefani@redhat.com \
    --cc=prasad@linux.vnet.ibm.com \
    --cc=rjw@sisk.pl \
    --cc=stern@rowland.harvard.edu \
    /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
all inboxes | Powered by JetHome®