From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 876C2C433E1 for ; Sat, 1 Aug 2020 01:15:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 605A22087C for ; Sat, 1 Aug 2020 01:15:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596244533; bh=2ty6n7QxjZO+RmKE+I+2VlQamclByiPMf022/oscKwQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Tpo6nxGLY2WMv3FqG1tsaxYk6ChEMNQsbR4fCZT6lYIXXd1G4AYWXpwDqr3WwiTo/ e0aGxvfpwxcRot1o76EdnfT5sOSNHMlBIgVt96zbaWQIleSJbpXuIVSkKv/jtkaFuj 7yah1y3VisjjTHWOGke4O3JLYH+caet5zMlHQxeA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728250AbgHABOu (ORCPT ); Fri, 31 Jul 2020 21:14:50 -0400 Received: from mail.kernel.org ([198.145.29.99]:43622 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728219AbgHABOr (ORCPT ); Fri, 31 Jul 2020 21:14:47 -0400 Received: from localhost.localdomain (unknown [89.208.247.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id BB95B21744; Sat, 1 Aug 2020 01:14:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596244487; bh=2ty6n7QxjZO+RmKE+I+2VlQamclByiPMf022/oscKwQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DAvjULSqtDE9oz8ZW0uNCAPUguRnnRAk6gVgt1fW0w4HMeJpFqi6IUZM8tNLYzHLR iDJ6le3RqR1+SUmxxlVeEyv3VdgHqivwuQY1x3vpHwN4QwMi5ea3xjmyNAKE3NCxhO Yh3uZHJ7I+uWq1VoDDKqyFvpkRWFNrjLNN8OEfVM= From: guoren@kernel.org To: guoren@kernel.org, arnd@arndb.de Cc: linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org, linux-arch@vger.kernel.org, Guo Ren Subject: [PATCH 05/13] csky: Fixup kprobes handler couldn't change pc Date: Sat, 1 Aug 2020 01:14:05 +0000 Message-Id: <1596244453-98575-6-git-send-email-guoren@kernel.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1596244453-98575-1-git-send-email-guoren@kernel.org> References: <1596244453-98575-1-git-send-email-guoren@kernel.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Guo Ren The "Changing Execution Path" section in the Documentation/kprobes.txt said: Since kprobes can probe into a running kernel code, it can change the register set, including instruction pointer. Signed-off-by: Guo Ren Cc: Arnd Bergmann --- arch/csky/abiv2/mcount.S | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/csky/abiv2/mcount.S b/arch/csky/abiv2/mcount.S index 911512b..d745e10 100644 --- a/arch/csky/abiv2/mcount.S +++ b/arch/csky/abiv2/mcount.S @@ -55,7 +55,9 @@ .macro mcount_exit_regs RESTORE_REGS_FTRACE - ldw t1, (sp, 0) + subi sp, 152 + ldw t1, (sp, 4) + addi sp, 152 ldw r8, (sp, 4) ldw lr, (sp, 8) addi sp, 12 -- 2.7.4