From patchwork Thu Nov 20 17:01:38 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kiszka X-Patchwork-Id: 5349921 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 [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 02D8AC11AC for ; Thu, 20 Nov 2014 17:18:46 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id F0C6F201ED for ; Thu, 20 Nov 2014 17:18:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EACF5201E4 for ; Thu, 20 Nov 2014 17:18:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757077AbaKTRSn (ORCPT ); Thu, 20 Nov 2014 12:18:43 -0500 Received: from thoth.sbs.de ([192.35.17.2]:51436 "EHLO thoth.sbs.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756934AbaKTRSn (ORCPT ); Thu, 20 Nov 2014 12:18:43 -0500 X-Greylist: delayed 961 seconds by postgrey-1.27 at vger.kernel.org; Thu, 20 Nov 2014 12:18:42 EST Received: from mail1.siemens.de (localhost [127.0.0.1]) by thoth.sbs.de (8.14.3/8.14.3) with ESMTP id sAKH287C030307; Thu, 20 Nov 2014 18:02:09 +0100 Received: from md1f2u6c.ww002.siemens.net (md1f2u6c.mch.sbs.de [139.25.40.156] (may be forged)) by mail1.siemens.de (8.14.3/8.14.3) with ESMTP id sAKH26Ai018988; Thu, 20 Nov 2014 18:02:08 +0100 From: Jan Kiszka To: Thomas Gleixner , linux-kernel@vger.kernel.org Cc: Andrew Morton , 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 v10 01/27] scripts/gdb: Add infrastructure Date: Thu, 20 Nov 2014 18:01:38 +0100 Message-Id: <0b1a0a304bc91e3db0a0878aeb6077013a94d8e2.1416502923.git.jan.kiszka@siemens.com> X-Mailer: git-send-email 1.8.4.5 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 | 6 +++++- 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, 53 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 00d618b..5917c1c 100644 --- a/Makefile +++ b/Makefile @@ -920,6 +920,9 @@ 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, @@ -1175,7 +1178,8 @@ MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \ Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ signing_key.priv signing_key.x509 x509.genkey \ extra_certificates signing_key.x509.keyid \ - signing_key.x509.signer include/linux/version.h + signing_key.x509.signer include/linux/version.h \ + vmlinux-gdb.py # clean - Delete most, but leave enough to build external modules # diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 4e35a5d..33e1974 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -167,6 +167,17 @@ config DEBUG_INFO_DWARF4 But it significantly improves the success of resolving variables in gdb on optimized code. +config GDB_SCRIPTS + bool "Provide GDB scripts for kernel debugging" + select DEBUG_INFO + help + This creates the required links to GDB helper scripts in the + build directory. If you load vmlinux into gdb, the helper + scripts will be automatically imported by gdb as well, and + additional functions are available to analyze a Linux kernel + instance. See Documentation/gdb-kernel-debugging.txt for further + details. + config ENABLE_WARN_DEPRECATED bool "Enable __deprecated logic" default y diff --git a/scripts/Makefile b/scripts/Makefile index 72902b5..7413b1b 100644 --- a/scripts/Makefile +++ b/scripts/Makefile @@ -36,6 +36,7 @@ subdir-$(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")