Re: [PATCH v5 3.1.0-rc4-tip 13/26] x86: define a x86 specificexception notifier.

[Oleg Nesterov]

On 09/20, Srikar Dronamraju wrote:
>
> +int uprobe_exception_notify(struct notifier_block *self,
> +				       unsigned long val, void *data)
> +{
> +	struct die_args *args = data;
> +	struct pt_regs *regs = args->regs;
> +	int ret = NOTIFY_DONE;
> +
> +	/* We are only interested in userspace traps */
> +	if (regs && !user_mode_vm(regs))
> +		return NOTIFY_DONE;
> +
> +	switch (val) {
> +	case DIE_INT3:
> +		/* Run your handler here */
> +		if (uprobe_bkpt_notifier(regs))
> +			ret = NOTIFY_STOP;
> +		break;

OK, but I simply can't understand do_int3(). It uses DIE_INT3 or
DIE_TRAP depending on CONFIG_KPROBES.

Oleg.

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