On Fri, May 29, 2009 at 01:20:48PM +1000, David Gibson wrote:
> On Mon, May 25, 2009 at 06:44:23AM +0530, K.Prasad wrote:
> > Prepare the PowerPC code for HW Breakpoint infrastructure patches by
> > including
> > relevant constant definitions and function declarations.
> >
> > Signed-off-by: K.Prasad <pra...@linux.vnet.ibm.com>
> > ---
> > arch/powerpc/include/asm/hw_breakpoint.h | 57
> > +++++++++++++++++++++++++++++++
> > arch/powerpc/include/asm/processor.h | 1
> > arch/powerpc/include/asm/reg.h | 3 +
> > 3 files changed, 61 insertions(+)
> >
> > Index: linux-2.6-tip.hbkpt/arch/powerpc/include/asm/hw_breakpoint.h
> > ===================================================================
> > --- /dev/null
> > +++ linux-2.6-tip.hbkpt/arch/powerpc/include/asm/hw_breakpoint.h
> > @@ -0,0 +1,57 @@
> > +#ifndef _PPC64_HW_BREAKPOINT_H
> > +#define _PPC64_HW_BREAKPOINT_H
> > +
> > +#ifdef __KERNEL__
> > +#define __ARCH_HW_BREAKPOINT_H
> > +#ifdef CONFIG_PPC64
> > +
> > +struct arch_hw_breakpoint {
> > + char *name; /* Contains name of the symbol to set bkpt */
> > + unsigned long address;
> > + u8 type;
>
> You might as well make this an int, it will get padded out to 4 bytes
> long anyway.
>
Okay.
> > +};
> > +
> > +#include <linux/kdebug.h>
> > +#include <asm/reg.h>
> > +#include <asm-generic/hw_breakpoint.h>
> > +
> > +#define HW_BREAKPOINT_READ DABR_DATA_READ
> > +#define HW_BREAKPOINT_WRITE DABR_DATA_WRITE
> > +#define HW_BREAKPOINT_RW (DABR_DATA_READ | DABR_DATA_WRITE)
> > +
> > +#define HW_BREAKPOINT_ALIGN 0x7
> > +#define HW_BREAKPOINT_LEN INSTRUCTION_LEN
> > +
> > +extern struct hw_breakpoint *hbp_kernel[HBP_NUM];
> > +DECLARE_PER_CPU(struct hw_breakpoint*, this_hbp_kernel[HBP_NUM]);
> > +extern unsigned int hbp_user_refcount[HBP_NUM];
> > +
> > +extern void arch_install_thread_hw_breakpoint(struct task_struct *tsk);
> > +extern void arch_uninstall_thread_hw_breakpoint(void);
> > +extern int arch_validate_hwbkpt_settings(struct hw_breakpoint *bp,
> > + struct task_struct *tsk);
> > +extern void arch_update_user_hw_breakpoint(int pos, struct task_struct
> > *tsk);
> > +extern void arch_flush_thread_hw_breakpoint(struct task_struct *tsk);
> > +extern void arch_update_kernel_hw_breakpoint(void *);
> > +extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
> > + unsigned long val, void *data);
> > +
> > +extern void flush_thread_hw_breakpoint(struct task_struct *tsk);
> > +extern int copy_thread_hw_breakpoint(struct task_struct *tsk,
> > + struct task_struct *child, unsigned long clone_flags);
> > +extern void load_debug_registers(void );
>
> It looks as though a lot of these arch hooks ought to have prototypes
> in the generic part of the infrastructure.
>
As I said before, the signatures of some of these functions are
different. But I agree that we may want to eventually consolidate them
into the generic header file, during future enhancements.
Thanks,
K.Prasad
> --
> 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_!
> http://www.ozlabs.org/~dgibson
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