static int ptrace_sethbpregs(struct task_struct *tsk, long num,
			     unsigned long __user *data)
{
	int idx, gen_len, gen_type, implied_type, ret = 0;
	u32 user_val;
	struct perf_event *bp;
	struct arch_hw_breakpoint_ctrl ctrl;
	struct perf_event_attr attr;

	if (num == 0)
		goto out;
	else if (num < 0)
		implied_type = HW_BREAKPOINT_RW;
	else
		implied_type = HW_BREAKPOINT_X;

	idx = ptrace_hbp_num_to_idx(num);
	if (idx < 0 || idx >= ARM_MAX_HBP_SLOTS) {
		ret = -EINVAL;
		goto out;
	}

	if (get_user(user_val, data)) {
		ret = -EFAULT;
		goto out;
	}

	bp = tsk->thread.debug.hbp[idx];
	if (!bp) {
		bp = ptrace_hbp_create(tsk, implied_type);
		if (IS_ERR(bp)) {
			ret = PTR_ERR(bp);
			goto out;
		}
		tsk->thread.debug.hbp[idx] = bp;
	}

	attr = bp->attr;

	if (num & 0x1) {
		/* Address */
		attr.bp_addr	= user_val;
	} else {
		/* Control */
		decode_ctrl_reg(user_val, &ctrl);
		ret = arch_bp_generic_fields(ctrl, &gen_len, &gen_type);
		if (ret)
			goto out;

		if ((gen_type & implied_type) != gen_type) {
			ret = -EINVAL;
			goto out;
		}

		attr.bp_len	= gen_len;
		attr.bp_type	= gen_type;
		attr.disabled	= !ctrl.enabled;
	}

	ret = modify_user_hw_breakpoint(bp, &attr);
out:
	return ret;
}
static int ptrace_sethbpregs(struct task_struct *tsk, long num,
			     unsigned long __user *data)
{
	int idx, gen_len, gen_type, implied_type, ret = 0;
	u32 user_val;
	struct perf_event *bp;
	struct arch_hw_breakpoint_ctrl ctrl;
	struct perf_event_attr attr;

	if (num == 0)
		goto out;
	else if (num < 0)
		implied_type = HW_BREAKPOINT_RW;
	else
		implied_type = HW_BREAKPOINT_X;

	idx = ptrace_hbp_num_to_idx(num);
	if (idx < 0 || idx >= ARM_MAX_HBP_SLOTS) {
		ret = -EINVAL;
		goto out;
	}

	if (get_user(user_val, data)) {
		ret = -EFAULT;
		goto out;
	}

	bp = tsk->thread.debug.hbp[idx];
	if (!bp) {
		bp = ptrace_hbp_create(tsk, implied_type);
		if (IS_ERR(bp)) {
			ret = PTR_ERR(bp);
			goto out;
		}
		tsk->thread.debug.hbp[idx] = bp;
	}

	attr = bp->attr;

	if (num & 0x1) {
		 
		attr.bp_addr	= user_val;
	} else {
		 
		decode_ctrl_reg(user_val, &ctrl);
		ret = arch_bp_generic_fields(ctrl, &gen_len, &gen_type);
		if (ret)
			goto out;

		if ((gen_type & implied_type) != gen_type) {
			ret = -EINVAL;
			goto out;
		}

		attr.bp_len	= gen_len;
		attr.bp_type	= gen_type;
		attr.disabled	= !ctrl.enabled;
	}

	ret = modify_user_hw_breakpoint(bp, &attr);
out:
	return ret;
}