On Thu, 2009-05-14 at 19:15 +0530, K.Prasad wrote: > plain text document attachment (ppc64_modify_process_handling_04)
> 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
>
> /* Clear the DAC and struct entries. One shot trigger */
> #if defined(CONFIG_BOOKE)
> @@ -372,8 +375,13 @@ struct task_struct *__switch_to(struct t
>
> #endif /* CONFIG_SMP */
>
> +#ifdef CONFIG_PPC64
> + if (unlikely(test_tsk_thread_flag(new, TIF_DEBUG)))
> + switch_to_thread_hw_breakpoint(new);
> +#else
To avoid all these ifdefs in the code we need something like this in a
header:
static inline int task_uses_debug_regs(struct task_struct *tsk)
{
#ifdef CONFIG_PPC64
return test_tsk_thread_flag(tsk, TIF_DEBUG);
#else
return 0;
#endif
}
> @@ -605,6 +617,9 @@ int copy_thread(unsigned long clone_flag
> struct pt_regs *childregs, *kregs;
> extern void ret_from_fork(void);
> unsigned long sp = (unsigned long)task_stack_page(p) + THREAD_SIZE;
> +#ifdef CONFIG_PPC64
> + struct task_struct *tsk = current;
> +#endif
>
> CHECK_FULL_REGS(regs);
> /* Copy registers */
> @@ -672,6 +687,9 @@ int copy_thread(unsigned long clone_flag
> * function.
> */
> kregs->nip = *((unsigned long *)ret_from_fork);
> +
> + if (unlikely(test_tsk_thread_flag(tsk, TIF_DEBUG)))
> + copy_thread_hw_breakpoint(tsk, p, clone_flags);
If you just use current here you don't need to define tsk above.
cheers
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