From patchwork Thu Jan 29 06:46:20 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kiszka X-Patchwork-Id: 5737971 Return-Path: X-Original-To: patchwork-linux-kbuild@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 43A10BF440 for ; Thu, 29 Jan 2015 06:58:32 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id DECF5201DD for ; Thu, 29 Jan 2015 06:58:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D423220120 for ; Thu, 29 Jan 2015 06:58:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754655AbbA2G5Y (ORCPT ); Thu, 29 Jan 2015 01:57:24 -0500 Received: from david.siemens.de ([192.35.17.14]:58352 "EHLO david.siemens.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750852AbbA2G5V (ORCPT ); Thu, 29 Jan 2015 01:57:21 -0500 Received: from mail1.siemens.de (localhost [127.0.0.1]) by david.siemens.de (8.14.3/8.14.3) with ESMTP id t0T6kr9Z016750; Thu, 29 Jan 2015 07:46:53 +0100 Received: from md1f2u6c.ww002.siemens.net ([139.22.116.231]) by mail1.siemens.de (8.14.3/8.14.3) with SMTP id t0T6kmvZ031868; Thu, 29 Jan 2015 07:46:52 +0100 From: Jan Kiszka To: Andrew Morton , linux-kernel@vger.kernel.org Cc: Thomas Gleixner , Jason Wessel , kgdb-bugreport@lists.sourceforge.net, Andi Kleen , Tom Tromey , Ben Widawsky , Borislav Petkov , Michal Marek , linux-kbuild@vger.kernel.org Subject: [PATCH v11 01/28] scripts/gdb: Add infrastructure Date: Thu, 29 Jan 2015 07:46:20 +0100 Message-Id: <39c235fa6c349bf025f957a1913c2e63be5b87c5.1422514006.git.jan.kiszka@siemens.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: References: In-Reply-To: References: Sender: linux-kbuild-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This provides the basic infrastructure to load kernel-specific python helper scripts when debugging the kernel in gdb. The loading mechanism is based on gdb loading for -gdb.py when opening . Therefore, this places a corresponding link to the main helper script into the output directory that contains vmlinux. The main scripts will pull in submodules containing Linux specific gdb commands and functions. To avoid polluting the source directory with compiled python modules, we link to them from the object directory. Due to gdb.parse_and_eval and string redirection for gdb.execute, we depend on gdb >= 7.2. This feature is enabled via CONFIG_GDB_SCRIPTS. CC: Michal Marek CC: linux-kbuild@vger.kernel.org Signed-off-by: Jan Kiszka --- Makefile | 5 ++++- lib/Kconfig.debug | 11 +++++++++++ scripts/Makefile | 3 ++- scripts/gdb/Makefile | 1 + scripts/gdb/linux/Makefile | 11 +++++++++++ scripts/gdb/linux/__init__.py | 0 scripts/gdb/vmlinux-gdb.py | 23 +++++++++++++++++++++++ 7 files changed, 52 insertions(+), 2 deletions(-) create mode 100644 scripts/gdb/Makefile create mode 100644 scripts/gdb/linux/Makefile create mode 100644 scripts/gdb/linux/__init__.py create mode 100644 scripts/gdb/vmlinux-gdb.py diff --git a/Makefile b/Makefile index 95a0e82..6881ddf 100644 --- a/Makefile +++ b/Makefile @@ -922,6 +922,9 @@ endif ifdef CONFIG_BUILD_DOCSRC $(Q)$(MAKE) $(build)=Documentation endif +ifdef CONFIG_GDB_SCRIPTS + $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py +endif +$(call if_changed,link-vmlinux) # The actual objects are generated when descending, @@ -1176,7 +1179,7 @@ MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \ Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ signing_key.priv signing_key.x509 x509.genkey \ extra_certificates signing_key.x509.keyid \ - signing_key.x509.signer + signing_key.x509.signer vmlinux-gdb.py # clean - Delete most, but leave enough to build external modules # diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 5f2ce61..74984af 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -167,6 +167,17 @@ config DEBUG_INFO_DWARF4 But it significantly improves the success of resolving variables in gdb on optimized code. +config GDB_SCRIPTS + bool "Provide GDB scripts for kernel debugging" + select DEBUG_INFO + help + This creates the required links to GDB helper scripts in the + build directory. If you load vmlinux into gdb, the helper + scripts will be automatically imported by gdb as well, and + additional functions are available to analyze a Linux kernel + instance. See Documentation/gdb-kernel-debugging.txt for further + details. + config ENABLE_WARN_DEPRECATED bool "Enable __deprecated logic" default y diff --git a/scripts/Makefile b/scripts/Makefile index 72902b5..7413b1b 100644 --- a/scripts/Makefile +++ b/scripts/Makefile @@ -36,6 +36,7 @@ subdir-$(CONFIG_MODVERSIONS) += genksyms subdir-y += mod subdir-$(CONFIG_SECURITY_SELINUX) += selinux subdir-$(CONFIG_DTC) += dtc +subdir-$(CONFIG_GDB_SCRIPTS) += gdb # Let clean descend into subdirs -subdir- += basic kconfig package +subdir- += basic kconfig package gdb diff --git a/scripts/gdb/Makefile b/scripts/gdb/Makefile new file mode 100644 index 0000000..62f5f65 --- /dev/null +++ b/scripts/gdb/Makefile @@ -0,0 +1 @@ +subdir-y := linux diff --git a/scripts/gdb/linux/Makefile b/scripts/gdb/linux/Makefile new file mode 100644 index 0000000..dcb63ab --- /dev/null +++ b/scripts/gdb/linux/Makefile @@ -0,0 +1,11 @@ +always := gdb-scripts + +SRCTREE := $(shell cd $(srctree) && /bin/pwd) + +$(obj)/gdb-scripts: +ifneq ($(KBUILD_SRC),) + $(Q)ln -fsn $(SRCTREE)/$(obj)/*.py $(objtree)/$(obj) +endif + @: + +clean-files := *.pyc $(if $(KBUILD_SRC),*.py) diff --git a/scripts/gdb/linux/__init__.py b/scripts/gdb/linux/__init__.py new file mode 100644 index 0000000..e69de29 diff --git a/scripts/gdb/vmlinux-gdb.py b/scripts/gdb/vmlinux-gdb.py new file mode 100644 index 0000000..c1d90ce --- /dev/null +++ b/scripts/gdb/vmlinux-gdb.py @@ -0,0 +1,23 @@ +# +# gdb helper commands and functions for Linux kernel debugging +# +# loader module +# +# Copyright (c) Siemens AG, 2012, 2013 +# +# Authors: +# Jan Kiszka +# +# This work is licensed under the terms of the GNU GPL version 2. +# + +import os + +sys.path.insert(0, os.path.dirname(__file__) + "/scripts/gdb") + +try: + gdb.parse_and_eval("0") + gdb.execute("", to_string=True) +except: + gdb.write("NOTE: gdb 7.2 or later required for Linux helper scripts to " + "work.\n")