From: "Frank Ch. Eigler" <fche@redhat.com>
To: Paul Mackerras <paulus@au1.ibm.com>
Cc: dcnltc@us.ibm.com, Roland McGrath <roland@redhat.com>,
systemtap@sourceware.org,
Maynard Johnson <mpjohn@us.ibm.com>,
James Keniston <kenistoj@us.ibm.com>
Subject: Re: kernel API for in-kernel single stepping
Date: Tue, 04 Sep 2007 03:05:00 -0000 [thread overview]
Message-ID: <20070903200300.GC24070@redhat.com> (raw)
In-Reply-To: <18134.21400.544087.580448@cargo.ozlabs.ibm.com>
Hi, Paul -
> [...]
> > [...] With the various kernel debuggers, kprobes, itrace, and
> > maybe others trying to share these
> > [MSR/single-stepping/notify_die] resources do you think it is time
> > to develop some sort of kernel single stepping API? Frank is
> > requesting this API before changing SystemTap to support single
> > step traps.
Actually, I have asked only about user-space single-stepping, possibly
based on the utrace API. Broad kernel-space single-stepping is risky
enough not to attempt yet.
> At present kprobes sets the MSR_SE bit in the MSR when it wants to
> single-step, and uses the notify_die infrastructure as the way it
> gets notified when the single-step trap occurs. [...] In other
> words the API for single-stepping is just the notify_die stuff.
> [...]
We can attempt this later.
- FChE
next prev parent reply other threads:[~2007-09-03 20:03 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-02 23:01 proposed instruction trace support in SystemTap Dave Nomura
2007-07-05 19:37 ` Frank Ch. Eigler
2007-07-06 12:46 ` grundy
2007-07-06 14:59 ` Frank Ch. Eigler
2007-07-06 21:43 ` Maynard Johnson
2007-07-07 1:58 ` Frank Ch. Eigler
2007-07-10 15:47 ` Maynard Johnson
2007-07-10 14:12 ` Dave Nomura
2007-07-10 14:39 ` Frank Ch. Eigler
2007-07-10 20:57 ` Maynard Johnson
2007-07-10 22:45 ` Jim Keniston
2007-07-11 4:31 ` Ananth N Mavinakayanahalli
2007-08-20 0:34 ` Dave Nomura
2007-08-20 0:37 ` Roland McGrath
2007-08-25 11:34 ` Dave Nomura
2007-08-29 14:57 ` Frank Ch. Eigler
2007-08-30 5:43 ` kernel API for in-kernel single stepping Dave Nomura
2007-08-30 13:05 ` Paul Mackerras
2007-09-04 3:05 ` Frank Ch. Eigler [this message]
2007-09-05 5:02 ` Dave Nomura
2007-08-29 15:40 ` proposed instruction trace support in SystemTap Dave Nomura
2007-08-29 16:25 ` Frank Ch. Eigler
2007-09-06 2:57 ` using utrace for instruction tracing Dave Nomura
2007-09-06 14:05 ` Jim Keniston
2007-09-06 18:28 ` Dave Nomura
2007-08-23 22:10 ` proposed instruction trace support in SystemTap Dave Nomura
2007-07-06 21:39 ` Maynard Johnson
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