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 <objfile>-gdb.py when opening <objfile>. 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.
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| @@ -926,6 +926,9 @@ ifdef CONFIG_SAMPLES · 925 unmodified lines | ||
| 926 | 926 | endif |
| 927 | 927 | ifdef CONFIG_BUILD_DOCSRC |
| 928 | 928 | $(Q)$(MAKE) $(build)=Documentation |
| 929 | +endif | |
| 930 | +ifdef CONFIG_GDB_SCRIPTS | |
| 931 | + $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py | |
| 929 | 932 | endif |
| 930 | 933 | +$(call if_changed,link-vmlinux) |
| 931 | 934 | |
| @@ -1181,7 +1184,7 @@ MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \ · 249 unmodified lines | ||
| 1181 | 1184 | Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ |
| 1182 | 1185 | signing_key.priv signing_key.x509 x509.genkey \ |
| 1183 | 1186 | extra_certificates signing_key.x509.keyid \ |
| 1184 | − signing_key.x509.signer | |
| 1187 | + signing_key.x509.signer vmlinux-gdb.py | |
| 1185 | 1188 | |
| 1186 | 1189 | # clean - Delete most, but leave enough to build external modules |
| 1187 | 1190 | # |
| @@ -167,6 +167,17 @@ config DEBUG_INFO_DWARF4 · 166 unmodified lines | ||
| 167 | 167 | But it significantly improves the success of resolving |
| 168 | 168 | variables in gdb on optimized code. |
| 169 | 169 | |
| 170 | +config GDB_SCRIPTS | |
| 171 | + bool "Provide GDB scripts for kernel debugging" | |
| 172 | + depends on DEBUG_INFO | |
| 173 | + help | |
| 174 | + This creates the required links to GDB helper scripts in the | |
| 175 | + build directory. If you load vmlinux into gdb, the helper | |
| 176 | + scripts will be automatically imported by gdb as well, and | |
| 177 | + additional functions are available to analyze a Linux kernel | |
| 178 | + instance. See Documentation/gdb-kernel-debugging.txt for further | |
| 179 | + details. | |
| 180 | + | |
| 170 | 181 | config ENABLE_WARN_DEPRECATED |
| 171 | 182 | bool "Enable __deprecated logic" |
| 172 | 183 | default y |
| @@ -36,6 +36,7 @@ subdir-$(CONFIG_MODVERSIONS) += genksyms · 35 unmodified lines | ||
| 36 | 36 | subdir-y += mod |
| 37 | 37 | subdir-$(CONFIG_SECURITY_SELINUX) += selinux |
| 38 | 38 | subdir-$(CONFIG_DTC) += dtc |
| 39 | +subdir-$(CONFIG_GDB_SCRIPTS) += gdb | |
| 39 | 40 | |
| 40 | 41 | # Let clean descend into subdirs |
| 41 | 42 | subdir- += basic kconfig package |
| @@ -0,0 +1 @@ | ||
| 1 | +subdir-y := linux | |
| @@ -0,0 +1,11 @@ | ||
| 1 | +always := gdb-scripts | |
| 2 | + | |
| 3 | +SRCTREE := $(shell cd $(srctree) && /bin/pwd) | |
| 4 | + | |
| 5 | +$(obj)/gdb-scripts: | |
| 6 | +ifneq ($(KBUILD_SRC),) | |
| 7 | + $(Q)ln -fsn $(SRCTREE)/$(obj)/*.py $(objtree)/$(obj) | |
| 8 | +endif | |
| 9 | + @: | |
| 10 | + | |
| 11 | +clean-files := *.pyc *.pyo $(if $(KBUILD_SRC),*.py) | |
| @@ -0,0 +1,23 @@ | ||
| 1 | +# | |
| 2 | +# gdb helper commands and functions for Linux kernel debugging | |
| 3 | +# | |
| 4 | +# loader module | |
| 5 | +# | |
| 6 | +# Copyright (c) Siemens AG, 2012, 2013 | |
| 7 | +# | |
| 8 | +# Authors: | |
| 9 | +# Jan Kiszka <jan.kiszka@siemens.com> | |
| 10 | +# | |
| 11 | +# This work is licensed under the terms of the GNU GPL version 2. | |
| 12 | +# | |
| 13 | + | |
| 14 | +import os | |
| 15 | + | |
| 16 | +sys.path.insert(0, os.path.dirname(__file__) + "/scripts/gdb") | |
| 17 | + | |
| 18 | +try: | |
| 19 | + gdb.parse_and_eval("0") | |
| 20 | + gdb.execute("", to_string=True) | |
| 21 | +except: | |
| 22 | + gdb.write("NOTE: gdb 7.2 or later required for Linux helper scripts to " | |
| 23 | + "work.\n") | |