From patchwork Fri Jun 6 17:18:42 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kiszka X-Patchwork-Id: 4313191 Return-Path: X-Original-To: patchwork-linux-kbuild@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 4B57E9F170 for ; Fri, 6 Jun 2014 17:38:00 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 61F0920171 for ; Fri, 6 Jun 2014 17:37:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6138920166 for ; Fri, 6 Jun 2014 17:37:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752671AbaFFRhx (ORCPT ); Fri, 6 Jun 2014 13:37:53 -0400 Received: from goliath.siemens.de ([192.35.17.28]:39736 "EHLO goliath.siemens.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752151AbaFFRhv (ORCPT ); Fri, 6 Jun 2014 13:37:51 -0400 Received: from mail1.siemens.de (localhost [127.0.0.1]) by goliath.siemens.de (8.14.3/8.14.3) with ESMTP id s56HJ52X017024; Fri, 6 Jun 2014 19:19:06 +0200 Received: from mchn199C.mchp.siemens.de.de ([139.25.40.156]) by mail1.siemens.de (8.14.3/8.14.3) with ESMTP id s56HJ3eb005182; Fri, 6 Jun 2014 19:19:05 +0200 From: Jan Kiszka To: Thomas Gleixner , Andrew Morton , linux-kernel@vger.kernel.org Cc: Jason Wessel , kgdb-bugreport@lists.sourceforge.net, Andi Kleen , Tom Tromey , Ben Widawsky , Borislav Petkov , Tatiana Al-Chueyr Martins , Michal Marek , linux-kbuild@vger.kernel.org Subject: [PATCH v8 01/22] scripts/gdb: Add infrastructure Date: Fri, 6 Jun 2014 19:18:42 +0200 Message-Id: X-Mailer: git-send-email 1.8.1.1.298.ge7eed54 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=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, 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 | 6 +++++- lib/Kconfig.debug | 11 +++++++++++ scripts/Makefile | 3 ++- scripts/gdb/Makefile | 11 +++++++++++ scripts/gdb/linux/Makefile | 9 +++++++++ scripts/gdb/linux/__init__.py | 0 scripts/gdb/vmlinux-gdb.py | 23 +++++++++++++++++++++++ 7 files changed, 61 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 cdaa5b6..029e700 100644 --- a/Makefile +++ b/Makefile @@ -861,6 +861,9 @@ endif ifdef CONFIG_BUILD_DOCSRC $(Q)$(MAKE) $(build)=Documentation endif +ifdef CONFIG_GDB_SCRIPTS + $(Q)ln -fsn $(srctree)/scripts/gdb/vmlinux-gdb.py +endif +$(call if_changed,link-vmlinux) # The actual objects are generated when descending, @@ -1109,7 +1112,8 @@ MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \ Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ signing_key.priv signing_key.x509 x509.genkey \ extra_certificates signing_key.x509.keyid \ - signing_key.x509.signer include/linux/version.h + signing_key.x509.signer include/linux/version.h \ + vmlinux-gdb.py # clean - Delete most, but leave enough to build external modules # diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 819ac51..89be8f6 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -143,6 +143,17 @@ config DEBUG_INFO_REDUCED DEBUG_INFO build and compile times are reduced too. Only works with newer gcc versions. +config GDB_SCRIPTS + bool "Provide GDB scripts for kernel debugging" + select DEBUG_INFO + help + This creates the required links to GDB helper scripts in the + build directory. If you load vmlinux into gdb, the helper + scripts will be automatically imported by gdb as well, and + additional functions are available to analyze a Linux kernel + instance. See Documentation/gdb-kernel-debugging.txt for further + details. + config ENABLE_WARN_DEPRECATED bool "Enable __deprecated logic" default y diff --git a/scripts/Makefile b/scripts/Makefile index 1d07860..9361e96 100644 --- a/scripts/Makefile +++ b/scripts/Makefile @@ -37,6 +37,7 @@ subdir-$(CONFIG_MODVERSIONS) += genksyms subdir-y += mod subdir-$(CONFIG_SECURITY_SELINUX) += selinux subdir-$(CONFIG_DTC) += dtc +subdir-$(CONFIG_GDB_SCRIPTS) += gdb # Let clean descend into subdirs -subdir- += basic kconfig package selinux +subdir- += basic kconfig package selinux gdb diff --git a/scripts/gdb/Makefile b/scripts/gdb/Makefile new file mode 100644 index 0000000..c0e2fd3 --- /dev/null +++ b/scripts/gdb/Makefile @@ -0,0 +1,11 @@ +subdir-y := linux + +always := gdb-scripts + +$(obj)/gdb-scripts: +ifneq ($(KBUILD_SRC),) + $(Q)ln -fsn $(srctree)/$(obj)/*.py $(objtree)/$(obj) +endif + @: + +clean-files := *.pyc $(if $(KBUILD_SRC),*.py) diff --git a/scripts/gdb/linux/Makefile b/scripts/gdb/linux/Makefile new file mode 100644 index 0000000..34ccd06 --- /dev/null +++ b/scripts/gdb/linux/Makefile @@ -0,0 +1,9 @@ +always := gdb-scripts + +$(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")