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SubjectRe: [RFC] [PATCH 2.6.37-rc5-tip 13/20] 13: x86: x86 specific probe handling
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On Thu, 2010-12-16 at 15:29 +0530, Srikar Dronamraju wrote:
>
> +void arch_uprobe_enable_sstep(struct pt_regs *regs)
> +{
> + /*
> + * Enable single-stepping by
> + * - Set TF on stack
> + * - Set TIF_SINGLESTEP: Guarantees that TF is set when
> + * returning to user mode.
> + * - Indicate that TF is set by us.
> + */
> + regs->flags |= X86_EFLAGS_TF;
> + set_thread_flag(TIF_SINGLESTEP);
> + set_thread_flag(TIF_FORCED_TF);
> +}
> +
> +void arch_uprobe_disable_sstep(struct pt_regs *regs)
> +{
> + /* Disable single-stepping by clearing what we set */
> + clear_thread_flag(TIF_SINGLESTEP);
> + clear_thread_flag(TIF_FORCED_TF);
> + regs->flags &= ~X86_EFLAGS_TF;
> +}

Why not use the code from arch/x86/kernel/step.c?


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