[Patch 4/6] Modify process and processor handling code to recognise hardware debug registers

[David Gibson]

On Wed, Jun 10, 2009 at 02:38:18PM +0530, K.Prasad wrote:
> Modify process handling code to recognise hardware debug registers during copy
> and flush operations. Introduce a new TIF_DEBUG task flag to indicate a
> process's use of debug register. Load the debug register values into a
> new CPU during initialisation.
> 
> Signed-off-by: K.Prasad <prasad at linux.vnet.ibm.com>
> ---
>  arch/powerpc/kernel/process.c |   15 +++++++++++++++
>  arch/powerpc/kernel/smp.c     |    2 ++
>  2 files changed, 17 insertions(+)
> 
> Index: linux-2.6-tip.hbkpt/arch/powerpc/kernel/process.c
> ===================================================================
> --- linux-2.6-tip.hbkpt.orig/arch/powerpc/kernel/process.c
> +++ linux-2.6-tip.hbkpt/arch/powerpc/kernel/process.c
> @@ -50,6 +50,7 @@
>  #include <asm/syscalls.h>
>  #ifdef CONFIG_PPC64
>  #include <asm/firmware.h>
> +#include <asm/hw_breakpoint.h>
>  #endif
>  #include <linux/kprobes.h>
>  #include <linux/kdebug.h>
> @@ -254,8 +255,10 @@ void do_dabr(struct pt_regs *regs, unsig
>  			11, SIGSEGV) == NOTIFY_STOP)
>  		return;
>  
> +#ifndef CONFIG_PPC64
>  	if (debugger_dabr_match(regs))
>  		return;
> +#endif

Won't this disable the check for breakpoints set by xmon - but I don't
see anything in this patch series to convert xmon to use the new
breakpoint interface instead.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
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