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Commit f197d75f authored by Kieran Bingham's avatar Kieran Bingham Committed by Linus Torvalds
Browse files

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: default avatarKieran Bingham <kieran.bingham@linaro.org>
Signed-off-by: default avatarJan Kiszka <jan.kiszka@siemens.com>
Cc: Michal Marek <mmarek@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 0c22fde8

Kbuild

+10 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ 
# 2) Generate timeconst.h

# 3) Generate asm-offsets.h (may need bounds.h and timeconst.h)

# 4) Check for missing system calls

# 5) Generate constants.py (may need bounds.h)



# Default sed regexp - multiline due to syntax constraints

define sed-y
@@ -96,5 +97,14 @@ quiet_cmd_syscalls = CALL $< 
missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE

	$(call cmd,syscalls)



#####

# 5) Generate constants for Python GDB integration

#



extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py



build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file)

	@$(MAKE) $(build)=scripts/gdb/linux $@



# Keep these three files during make clean

no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file)

scripts/gdb/linux/Makefile

+11 −1
Original line number Diff line number Diff line
@@ -8,4 +8,14 @@ ifneq ($(KBUILD_SRC),) 
endif

	@:



clean-files := *.pyc *.pyo $(if $(KBUILD_SRC),*.py)
 
quiet_cmd_gen_constants_py = GEN     $@

      cmd_gen_constants_py = \

	$(CPP) -E -x c -P $(c_flags) $< > $@ ;\

	sed -i '1,/<!-- end-c-headers -->/d;' $@



$(obj)/constants.py: $(SRCTREE)/$(obj)/constants.py.in

	$(call if_changed,gen_constants_py)



build_constants_py: $(obj)/constants.py



clean-files := *.pyc *.pyo $(if $(KBUILD_SRC),*.py) $(obj)/constants.py

scripts/gdb/linux/constants.py.in

0 → 100644
+32 −0
Original line number Diff line number Diff line 
/*

 * gdb helper commands and functions for Linux kernel debugging

 *

 *  Kernel constants derived from include files.

 *

 * Copyright (c) 2016 Linaro Ltd

 *

 * Authors:

 *  Kieran Bingham <kieran.bingham@linaro.org>

 *

 * This work is licensed under the terms of the GNU GPL version 2.

 *

 */



/* We need to stringify expanded macros so that they can be parsed */

#define STRING(x) #x

#define XSTRING(x) STRING(x)



#define LX_VALUE(x) LX_##x = x

#define LX_GDBPARSED(x) LX_##x = gdb.parse_and_eval(XSTRING(x))



/*

 * IS_ENABLED generates (a || b) which is not compatible with python

 * We can only switch on configuration items we know are available

 * Therefore - IS_BUILTIN() is more appropriate

 */

#define LX_CONFIG(x) LX_##x = IS_BUILTIN(x)



/* The build system will take care of deleting everything above this marker */

<!-- end-c-headers -->



import gdb

scripts/gdb/vmlinux-gdb.py

+1 −0
Original line number Diff line number Diff line
@@ -30,3 +30,4 @@ else: 
    import linux.cpus

    import linux.lists

    import linux.proc

    import linux.constants