linux-kernel - Re: [patch 4/8] Immediate Values - Move Kprobes i386 restore

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Message-ID: <20070907103159.GB10389@in.ibm.com>
Date:	Fri, 7 Sep 2007 16:01:59 +0530
From:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>, prasanna@...ibm.com,
	anil.s.keshavamurthy@...el.com, davem@...emloft.net
Subject: Re: [patch 4/8] Immediate Values - Move Kprobes i386 restore_interrupt to kdebug.h

On Thu, Sep 06, 2007 at 04:02:32PM -0400, Mathieu Desnoyers wrote:
> Since the breakpoint handler is useful both to kprobes and immediate values, it
> makes sense to make the required restore_interrupt() available through
> asm-i386/kdebug.h.
> 
> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>

Acked-by: Ananth N Mavinakayanahalli <ananth@...ibm.com>

> CC: Christoph Hellwig <hch@...radead.org>
> CC: prasanna@...ibm.com
> CC: ananth@...ibm.com
> CC: anil.s.keshavamurthy@...el.com
> CC: davem@...emloft.net
> ---
>  include/asm-i386/kdebug.h  |   12 ++++++++++++
>  include/asm-i386/kprobes.h |    9 ---------
>  2 files changed, 12 insertions(+), 9 deletions(-)
> 
> Index: linux-2.6-lttng/include/asm-i386/kdebug.h
> ===================================================================
> --- linux-2.6-lttng.orig/include/asm-i386/kdebug.h	2007-09-04 11:52:37.000000000 -0400
> +++ linux-2.6-lttng/include/asm-i386/kdebug.h	2007-09-04 12:12:06.000000000 -0400
> @@ -6,6 +6,9 @@
>   * from x86_64 architecture.
>   */
> 
> +#include <asm/ptrace.h>
> +#include <asm/system.h>
> +
>  struct pt_regs;
> 
>  /* Grossly misnamed. */
> @@ -25,4 +28,13 @@ enum die_val {
>  	DIE_PAGE_FAULT_NO_CONTEXT,
>  };
> 
> +/* trap3/1 are intr gates for kprobes.  So, restore the status of IF,
> + * if necessary, before executing the original int3/1 (trap) handler.
> + */
> +static inline void restore_interrupts(struct pt_regs *regs)
> +{
> +	if (regs->eflags & IF_MASK)
> +		local_irq_enable();
> +}
> +
>  #endif
> Index: linux-2.6-lttng/include/asm-i386/kprobes.h
> ===================================================================
> --- linux-2.6-lttng.orig/include/asm-i386/kprobes.h	2007-09-04 11:53:26.000000000 -0400
> +++ linux-2.6-lttng/include/asm-i386/kprobes.h	2007-09-04 12:12:06.000000000 -0400
> @@ -79,15 +79,6 @@ struct kprobe_ctlblk {
>  	struct prev_kprobe prev_kprobe;
>  };
> 
> -/* trap3/1 are intr gates for kprobes.  So, restore the status of IF,
> - * if necessary, before executing the original int3/1 (trap) handler.
> - */
> -static inline void restore_interrupts(struct pt_regs *regs)
> -{
> -	if (regs->eflags & IF_MASK)
> -		local_irq_enable();
> -}
> -
>  extern int kprobe_exceptions_notify(struct notifier_block *self,
>  				    unsigned long val, void *data);
>  extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
> 
> -- 
> Mathieu Desnoyers
> Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
> OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
> -
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