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scripts/gdb: provide linux constants
Some macro's and defines are needed when parsing memory, and without compiling the kernel as -g3 they are not available in the debug-symbols. We use the pre-processor here to extract constants to a dedicated module for the linux debugger extensions Top level Kbuild is used to call in and generate the constants file, while maintaining dependencies on autogenerated files in include/generated Link: http://lkml.kernel.org/r/bc3df9c25f57ea72177c066a51a446fc19e2c27f.1462865983.git.jan.kiszka@siemens.com Signed-off-by: Kieran Bingham <kieran.bingham@linaro.org> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Cc: Michal Marek <mmarek@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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10
Kbuild
10
Kbuild
@ -5,6 +5,7 @@
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# 2) Generate timeconst.h
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# 3) Generate asm-offsets.h (may need bounds.h and timeconst.h)
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# 4) Check for missing system calls
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# 5) Generate constants.py (may need bounds.h)
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# Default sed regexp - multiline due to syntax constraints
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define sed-y
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@ -96,5 +97,14 @@ quiet_cmd_syscalls = CALL $<
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missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
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$(call cmd,syscalls)
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#####
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# 5) Generate constants for Python GDB integration
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#
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extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py
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build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file)
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@$(MAKE) $(build)=scripts/gdb/linux $@
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# Keep these three files during make clean
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no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file)
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@ -8,4 +8,14 @@ ifneq ($(KBUILD_SRC),)
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endif
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@:
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clean-files := *.pyc *.pyo $(if $(KBUILD_SRC),*.py)
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quiet_cmd_gen_constants_py = GEN $@
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cmd_gen_constants_py = \
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$(CPP) -E -x c -P $(c_flags) $< > $@ ;\
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sed -i '1,/<!-- end-c-headers -->/d;' $@
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$(obj)/constants.py: $(SRCTREE)/$(obj)/constants.py.in
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$(call if_changed,gen_constants_py)
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build_constants_py: $(obj)/constants.py
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clean-files := *.pyc *.pyo $(if $(KBUILD_SRC),*.py) $(obj)/constants.py
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32
scripts/gdb/linux/constants.py.in
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32
scripts/gdb/linux/constants.py.in
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@ -0,0 +1,32 @@
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/*
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* gdb helper commands and functions for Linux kernel debugging
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*
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* Kernel constants derived from include files.
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*
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* Copyright (c) 2016 Linaro Ltd
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*
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* Authors:
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* Kieran Bingham <kieran.bingham@linaro.org>
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*
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* This work is licensed under the terms of the GNU GPL version 2.
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*
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*/
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/* We need to stringify expanded macros so that they can be parsed */
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#define STRING(x) #x
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#define XSTRING(x) STRING(x)
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#define LX_VALUE(x) LX_##x = x
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#define LX_GDBPARSED(x) LX_##x = gdb.parse_and_eval(XSTRING(x))
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/*
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* IS_ENABLED generates (a || b) which is not compatible with python
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* We can only switch on configuration items we know are available
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* Therefore - IS_BUILTIN() is more appropriate
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*/
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#define LX_CONFIG(x) LX_##x = IS_BUILTIN(x)
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/* The build system will take care of deleting everything above this marker */
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<!-- end-c-headers -->
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import gdb
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@ -30,3 +30,4 @@ else:
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import linux.cpus
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import linux.lists
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import linux.proc
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import linux.constants
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