liblockdep: Wrap kernel/locking/lockdep.c to allow usage from userspace

# liblockdep version

LL_VERSION = 0

LL_PATCHLEVEL = 0

LL_EXTRAVERSION = 1

# file format version

FILE_VERSION = 1

MAKEFLAGS += --no-print-directory

# Makefiles suck: This macro sets a default value of $(2) for the

# variable named by $(1), unless the variable has been set by

# environment or command line. This is necessary for CC and AR

# because make sets default values, so the simpler ?= approach

# won't work as expected.

define allow-override

  $(if $(or $(findstring environment,$(origin $(1))),\

            $(findstring command line,$(origin $(1)))),,\

    $(eval $(1) = $(2)))

endef

# Allow setting CC and AR, or setting CROSS_COMPILE as a prefix.

$(call allow-override,CC,$(CROSS_COMPILE)gcc)

$(call allow-override,AR,$(CROSS_COMPILE)ar)

INSTALL = install

# Use DESTDIR for installing into a different root directory.

# This is useful for building a package. The program will be

# installed in this directory as if it was the root directory.

# Then the build tool can move it later.

DESTDIR ?=

DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'

prefix ?= /usr/local

libdir_relative = lib

libdir = $(prefix)/$(libdir_relative)

bindir_relative = bin

bindir = $(prefix)/$(bindir_relative)

export DESTDIR DESTDIR_SQ INSTALL

# copy a bit from Linux kbuild

ifeq ("$(origin V)", "command line")

  VERBOSE = $(V)

endif

ifndef VERBOSE

  VERBOSE = 0

endif

ifeq ("$(origin O)", "command line")

  BUILD_OUTPUT := $(O)

endif

ifeq ($(BUILD_SRC),)

ifneq ($(BUILD_OUTPUT),)

define build_output

	$(if $(VERBOSE:1=),@)$(MAKE) -C $(BUILD_OUTPUT)	\

	BUILD_SRC=$(CURDIR) -f $(CURDIR)/Makefile $1

endef

saved-output := $(BUILD_OUTPUT)

BUILD_OUTPUT := $(shell cd $(BUILD_OUTPUT) && /bin/pwd)

$(if $(BUILD_OUTPUT),, \

     $(error output directory "$(saved-output)" does not exist))

all: sub-make

gui: force

	$(call build_output, all_cmd)

$(filter-out gui,$(MAKECMDGOALS)): sub-make

sub-make: force

	$(call build_output, $(MAKECMDGOALS))

# Leave processing to above invocation of make

skip-makefile := 1

endif # BUILD_OUTPUT

endif # BUILD_SRC

# We process the rest of the Makefile if this is the final invocation of make

ifeq ($(skip-makefile),)

srctree		:= $(if $(BUILD_SRC),$(BUILD_SRC),$(CURDIR))

objtree		:= $(CURDIR)

src		:= $(srctree)

obj		:= $(objtree)

export prefix libdir bindir src obj

# Shell quotes

libdir_SQ = $(subst ','\'',$(libdir))

bindir_SQ = $(subst ','\'',$(bindir))

LIB_FILE = liblockdep.a liblockdep.so

BIN_FILE = lockdep

CONFIG_INCLUDES =

CONFIG_LIBS	=

CONFIG_FLAGS	=

OBJ		= $@

N		=

export Q VERBOSE

LIBLOCKDEP_VERSION = $(LL_VERSION).$(LL_PATCHLEVEL).$(LL_EXTRAVERSION)

INCLUDES = -I. -I/usr/local/include -I./uinclude $(CONFIG_INCLUDES)

# Set compile option CFLAGS if not set elsewhere

CFLAGS ?= -g -DCONFIG_LOCKDEP -DCONFIG_STACKTRACE -DCONFIG_PROVE_LOCKING -DBITS_PER_LONG=__WORDSIZE -DLIBLOCKDEP_VERSION='"$(LIBLOCKDEP_VERSION)"' -rdynamic -O0 -g

override CFLAGS += $(CONFIG_FLAGS) $(INCLUDES) $(PLUGIN_DIR_SQ)

ifeq ($(VERBOSE),1)

  Q =

  print_compile =

  print_app_build =

  print_fpic_compile =

  print_shared_lib_compile =

  print_install =

else

  Q = @

  print_compile =		echo '  CC                 '$(OBJ);

  print_app_build =		echo '  BUILD              '$(OBJ);

  print_fpic_compile =		echo '  CC FPIC            '$(OBJ);

  print_shared_lib_compile =	echo '  BUILD SHARED LIB   '$(OBJ);

  print_static_lib_build =	echo '  BUILD STATIC LIB   '$(OBJ);

  print_install =		echo '  INSTALL     '$1'	to	$(DESTDIR_SQ)$2';

endif

do_fpic_compile =					\

	($(print_fpic_compile)				\

	$(CC) -c $(CFLAGS) $(EXT) -fPIC $< -o $@)

do_app_build =						\

	($(print_app_build)				\

	$(CC) $^ -rdynamic -o $@ $(CONFIG_LIBS) $(LIBS))

do_compile_shared_library =			\

	($(print_shared_lib_compile)		\

	$(CC) --shared $^ -o $@ -lpthread -ldl)

do_build_static_lib =				\

	($(print_static_lib_build)		\

	$(RM) $@;  $(AR) rcs $@ $^)

define do_compile

	$(print_compile)						\

	$(CC) -c $(CFLAGS) $(EXT) $< -o $(obj)/$@;

endef

$(obj)/%.o: $(src)/%.c

	$(Q)$(call do_compile)

%.o: $(src)/%.c

	$(Q)$(call do_compile)

PEVENT_LIB_OBJS = common.o lockdep.o preload.o rbtree.o

ALL_OBJS = $(PEVENT_LIB_OBJS)

CMD_TARGETS = $(LIB_FILE)

TARGETS = $(CMD_TARGETS)

all: all_cmd

all_cmd: $(CMD_TARGETS)

liblockdep.so: $(PEVENT_LIB_OBJS)

	$(Q)$(do_compile_shared_library)

liblockdep.a: $(PEVENT_LIB_OBJS)

	$(Q)$(do_build_static_lib)

$(PEVENT_LIB_OBJS): %.o: $(src)/%.c

	$(Q)$(do_fpic_compile)

## make deps

all_objs := $(sort $(ALL_OBJS))

all_deps := $(all_objs:%.o=.%.d)

# let .d file also depends on the source and header files

define check_deps

		@set -e; $(RM) $@; \

		$(CC) -MM $(CFLAGS) $< > $@.$$$$; \

		sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' < $@.$$$$ > $@; \

		$(RM) $@.$$$$

endef

$(all_deps): .%.d: $(src)/%.c

	$(Q)$(call check_deps)

$(all_objs) : %.o : .%.d

dep_includes := $(wildcard $(all_deps))

ifneq ($(dep_includes),)

 include $(dep_includes)

endif

### Detect environment changes

TRACK_CFLAGS = $(subst ','\'',$(CFLAGS)):$(ARCH):$(CROSS_COMPILE)

tags:	force

	$(RM) tags

	find . -name '*.[ch]' | xargs ctags --extra=+f --c-kinds=+px \

	--regex-c++='/_PE\(([^,)]*).*/PEVENT_ERRNO__\1/'

TAGS:	force

	$(RM) TAGS

	find . -name '*.[ch]' | xargs etags \

	--regex='/_PE(\([^,)]*\).*/PEVENT_ERRNO__\1/'

define do_install

	$(print_install)				\

	if [ ! -d '$(DESTDIR_SQ)$2' ]; then		\

		$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2';	\

	fi;						\

	$(INSTALL) $1 '$(DESTDIR_SQ)$2'

endef

install_lib: all_cmd

	$(Q)$(call do_install,$(LIB_FILE),$(libdir_SQ))

	$(Q)$(call do_install,$(BIN_FILE),$(bindir_SQ))

install: install_lib

clean:

	$(RM) *.o *~ $(TARGETS) *.a *.so $(VERSION_FILES) .*.d

	$(RM) tags TAGS

endif # skip-makefile

PHONY += force

force:

# Declare the contents of the .PHONY variable as phony.  We keep that

# information in a variable so we can use it in if_changed and friends.

.PHONY: $(PHONY)

#include <stddef.h>

#include <stdbool.h>

#include <linux/compiler.h>

#include <linux/lockdep.h>

#include <unistd.h>

#include <sys/syscall.h>

static __thread struct task_struct current_obj;

/* lockdep wants these */

bool debug_locks = true;

bool debug_locks_silent;

__attribute__((constructor)) static void liblockdep_init(void)

{

	lockdep_init();

}

__attribute__((destructor)) static void liblockdep_exit(void)

{

	debug_check_no_locks_held(&current_obj);

}

struct task_struct *__curr(void)

{

	if (current_obj.pid == 0) {

		/* Makes lockdep output pretty */

		prctl(PR_GET_NAME, current_obj.comm);

		current_obj.pid = syscall(__NR_gettid);

	}

	return &current_obj;

}

#include <linux/lockdep.h>

#include "../../../kernel/locking/lockdep.c"

#include "../../../kernel/locking/lockdep_internals.h"

#include "../../../kernel/locking/lockdep_states.h"