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From: Roland McGrath <roland@hack.frob.com>
To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>,
	Linux-mm <linux-mm@kvack.org>,
	Arnaldo Carvalho de Melo <acme@infradead.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Andi Kleen <andi@firstfloor.org>,
	Christoph Hellwig <hch@infradead.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
	Oleg Nesterov <oleg@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	SystemTap <systemtap@sources.redhat.com>,
	Jim Keniston <jkenisto@linux.vnet.ibm.com>,
	Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
	LKML <linux-kernel@vger.kernel.org>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Subject: Re: [PATCH v2 2.6.38-rc8-tip 6/20] 6: x86: analyze instruction and determine fixups.
Date: Fri, 18 Mar 2011 12:10:47 -0700 (PDT)	[thread overview]
Message-ID: <20110318191047.4BAF12C183@topped-with-meat.com> (raw)
In-Reply-To: Srikar Dronamraju's message of  Saturday, 19 March 2011 00:19:22 +0530 <20110318184922.GA31152@linux.vnet.ibm.com>

> So we rewrite the copy of instruction (stored in XOL) such that it
> accesses its memory operand indirectly thro a scratch register.
> The contents of the scratch register are stored before singlestep and
> restored later.

I see.  That should work fine in principle, assuming you use a register
that is not otherwise involved, of course.  I hope you arrange to restore
the register if the copied instruction is never run because of a signal or
suchlike.  In that case, it's important that the signal context get the
original register and original PC rather than the fiddled state for running
the copy.  Likewise, if anyone is inspecting the registers right after the
step.


Thanks,
Roland

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  parent reply	other threads:[~2011-03-18 19:12 UTC|newest]

Thread overview: 100+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-03-14 13:34 [PATCH v2 2.6.38-rc8-tip 0/20] 0: Inode based uprobes Srikar Dronamraju
2011-03-14 13:34 ` [PATCH v2 2.6.38-rc8-tip 1/20] 1: mm: Move replace_page() to mm/memory.c Srikar Dronamraju
2011-03-14 14:16   ` Steven Rostedt
2011-03-14 17:02     ` Srikar Dronamraju
2011-03-14 17:13       ` Steven Rostedt
2011-03-14 17:29         ` Srikar Dronamraju
2011-03-14 13:34 ` [PATCH v2 2.6.38-rc8-tip 2/20] 2: X86 specific breakpoint definitions Srikar Dronamraju
2011-03-14 13:34 ` [PATCH v2 2.6.38-rc8-tip 3/20] 3: uprobes: Breakground page replacement Srikar Dronamraju
2011-03-14 15:29   ` Steven Rostedt
2011-03-14 15:38   ` Steven Rostedt
2011-03-14 17:24     ` Srikar Dronamraju
2011-03-14 18:21       ` Steven Rostedt
2011-03-14 18:22       ` Steven Rostedt
2011-03-14 16:58   ` Stephen Wilson
2011-03-14 17:30     ` Srikar Dronamraju
2011-03-15 13:22   ` Thomas Gleixner
2011-03-15 17:51     ` Srikar Dronamraju
2011-03-15 18:03       ` Thomas Gleixner
2011-03-15 18:07         ` Srikar Dronamraju
2011-03-14 13:34 ` [PATCH v2 2.6.38-rc8-tip 4/20] 4: uprobes: Adding and remove a uprobe in a rb tree Srikar Dronamraju
2011-03-15 13:38   ` Thomas Gleixner
2011-03-15 13:43     ` Steven Rostedt
2011-03-15 17:30     ` Srikar Dronamraju
2011-03-15 19:22       ` Thomas Gleixner
2011-03-15 19:48         ` Peter Zijlstra
2011-03-15 22:42           ` Eric Dumazet
2011-03-16  7:54             ` Peter Zijlstra
2011-03-14 13:34 ` [PATCH v2 2.6.38-rc8-tip 5/20] 5: Uprobes: register/unregister probes Srikar Dronamraju
2011-03-14 16:00   ` Steven Rostedt
2011-03-14 17:32     ` Srikar Dronamraju
2011-03-15 14:28   ` Thomas Gleixner
2011-03-15 17:15     ` Srikar Dronamraju
2011-03-15 17:47       ` Steven Rostedt
2011-03-15 17:50         ` Peter Zijlstra
2011-03-15 18:04           ` Srikar Dronamraju
2011-03-15 18:15             ` Peter Zijlstra
2011-03-18 18:53               ` Srikar Dronamraju
2011-03-15 18:15       ` Thomas Gleixner
2011-03-14 13:35 ` [PATCH v2 2.6.38-rc8-tip 6/20] 6: x86: analyze instruction and determine fixups Srikar Dronamraju
2011-03-15 14:36   ` Thomas Gleixner
2011-03-18 18:24     ` Srikar Dronamraju
2011-03-18 18:36       ` Roland McGrath
2011-03-18 18:49         ` Srikar Dronamraju
2011-03-18 19:07           ` Srikar Dronamraju
2011-03-18 19:10           ` Roland McGrath [this message]
2011-03-14 13:35 ` [PATCH v2 2.6.38-rc8-tip 7/20] 7: uprobes: store/restore original instruction Srikar Dronamraju
2011-03-14 18:09   ` Stephen Wilson
2011-03-15  9:22     ` Srikar Dronamraju
2011-03-15 13:47       ` Steven Rostedt
2011-03-15 16:15         ` Stephen Wilson
2011-03-15 16:17           ` Srikar Dronamraju
2011-03-15 16:21           ` Steven Rostedt
2011-03-15 17:57       ` Peter Zijlstra
2011-03-15 18:58         ` Balbir Singh
2011-03-15 19:30           ` Peter Zijlstra
2011-03-15 19:32             ` Steven Rostedt
2011-03-16  5:51               ` Balbir Singh
2011-03-16 17:40                 ` Steven Rostedt
2011-03-15 14:41   ` Thomas Gleixner
2011-03-15 16:25     ` Srikar Dronamraju
2011-03-14 13:35 ` [PATCH v2 2.6.38-rc8-tip 8/20] 8: uprobes: mmap and fork hooks Srikar Dronamraju
2011-03-14 13:35 ` [PATCH v2 2.6.38-rc8-tip 9/20] 9: x86: architecture specific task information Srikar Dronamraju
2011-03-14 13:36 ` [PATCH v2 2.6.38-rc8-tip 10/20] 10: uprobes: task specific information Srikar Dronamraju
2011-03-14 13:36 ` [PATCH v2 2.6.38-rc8-tip 11/20] 11: uprobes: slot allocation for uprobes Srikar Dronamraju
2011-03-15 19:10   ` Jonathan Corbet
2011-03-16  4:58     ` Srikar Dronamraju
2011-03-15 20:31   ` Stephen Wilson
2011-03-16  4:50     ` Srikar Dronamraju
2011-03-14 13:36 ` [PATCH v2 2.6.38-rc8-tip 12/20] 12: uprobes: get the breakpoint address Srikar Dronamraju
2011-03-14 13:36 ` [PATCH v2 2.6.38-rc8-tip 13/20] 13: x86: x86 specific probe handling Srikar Dronamraju
2011-03-14 13:36 ` [PATCH v2 2.6.38-rc8-tip 14/20] 14: uprobes: Handing int3 and singlestep exception Srikar Dronamraju
2011-03-14 13:36 ` [PATCH v2 2.6.38-rc8-tip 15/20] 15: x86: uprobes exception notifier for x86 Srikar Dronamraju
2011-03-14 13:37 ` [PATCH v2 2.6.38-rc8-tip 16/20] 16: uprobes: register a notifier for uprobes Srikar Dronamraju
2011-03-15 19:56   ` Stephen Wilson
2011-03-18 19:28     ` Srikar Dronamraju
2011-03-14 13:37 ` [PATCH v2 2.6.38-rc8-tip 17/20] 17: uprobes: filter chain Srikar Dronamraju
2011-03-15 19:49   ` Stephen Wilson
2011-03-18 19:16     ` Srikar Dronamraju
2011-03-18 22:10       ` Stephen Wilson
2011-03-14 13:37 ` [PATCH v2 2.6.38-rc8-tip 18/20] 18: uprobes: commonly used filters Srikar Dronamraju
2011-03-14 13:37 ` [PATCH v2 2.6.38-rc8-tip 19/20] 19: tracing: Extract out common code for kprobes/uprobes traceevents Srikar Dronamraju
2011-03-14 13:37 ` [PATCH v2 2.6.38-rc8-tip 20/20] 20: tracing: uprobes trace_event interface Srikar Dronamraju
2011-03-14 23:30 ` [PATCH v2 2.6.38-rc8-tip 0/20] 0: Inode based uprobes Andrew Morton
2011-03-14 23:47   ` Andi Kleen
2011-03-15  0:22     ` Thomas Gleixner
2011-03-15 18:06       ` Andi Kleen
2011-03-15 19:43         ` Thomas Gleixner
2011-03-15 20:01           ` Steven Rostedt
2011-03-15 20:09             ` Thomas Gleixner
2011-03-15 20:44               ` Steven Rostedt
2011-03-16 17:32                 ` Tom Tromey
2011-03-16 17:44                   ` Steven Rostedt
2011-03-16 17:27               ` Tom Tromey
2011-03-15  1:13   ` Frank Ch. Eigler
2011-03-15  1:35     ` Thomas Gleixner
2011-03-15  5:21       ` Srikar Dronamraju
2011-03-15 11:02         ` Thomas Gleixner
2011-03-15 11:37           ` Srikar Dronamraju
2011-03-15  1:57   ` Srikar Dronamraju
2011-03-15  2:52   ` Steven Rostedt

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