Commit 1347a2ce authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 

Pull kbuild updates from Michal Marek.

Fixed up nontrivial merge conflict in Makefile as per Stephen Rothwell
and linux-next (and trivial arch/sparc/Makefile changes due to removed
sparc32 logic).

* 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild:
  mips: Fix KBUILD_CPPFLAGS definition
  kbuild: fix ia64 link
  kbuild: document KBUILD_LDS, KBUILD_VMLINUX_{INIT,MAIN} and LDFLAGS_vmlinux
  kbuild: link of vmlinux moved to a script
  kbuild: refactor final link of sparc32
  kbuild: drop unused KBUILD_VMLINUX_OBJS from top-level Makefile
  kbuild: Makefile: remove unnecessary check for m68knommu ARCH
parents 90324cc1 f7fc237e

Documentation/kbuild/kbuild.txt

+19 −0
Original line number Diff line number Diff line
@@ -50,6 +50,10 @@ LDFLAGS_MODULE 
--------------------------------------------------

Additional options used for $(LD) when linking modules.



LDFLAGS_vmlinux

--------------------------------------------------

Additional options passed to final link of vmlinux.



KBUILD_VERBOSE

--------------------------------------------------

Set the kbuild verbosity. Can be assigned same values as "V=...".
@@ -214,3 +218,18 @@ KBUILD_BUILD_USER, KBUILD_BUILD_HOST 
These two variables allow to override the user@host string displayed during

boot and in /proc/version. The default value is the output of the commands

whoami and host, respectively.



KBUILD_LDS

--------------------------------------------------

The linker script with full path. Assigned by the top-level Makefile.



KBUILD_VMLINUX_INIT

--------------------------------------------------

All object files for the init (first) part of vmlinux.

Files specified with KBUILD_VMLINUX_INIT are linked first.



KBUILD_VMLINUX_MAIN

--------------------------------------------------

All object files for the main part of vmlinux.

KBUILD_VMLINUX_INIT and KBUILD_VMLINUX_MAIN together specify

all the object files used to link vmlinux.

Makefile

+15 −216
Original line number Diff line number Diff line
@@ -231,10 +231,6 @@ endif 
# Where to locate arch specific headers

hdr-arch  := $(SRCARCH)



ifeq ($(ARCH),m68knommu)

       hdr-arch  := m68k

endif



KCONFIG_CONFIG	?= .config

export KCONFIG_CONFIG
@@ -341,7 +337,6 @@ AWK = awk 
GENKSYMS	= scripts/genksyms/genksyms

INSTALLKERNEL  := installkernel

DEPMOD		= /sbin/depmod

KALLSYMS	= scripts/kallsyms

PERL		= perl

CHECK		= sparse
@@ -739,197 +734,21 @@ libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 
libs-y2		:= $(patsubst %/, %/built-in.o, $(libs-y))

libs-y		:= $(libs-y1) $(libs-y2)



# Build vmlinux

# ---------------------------------------------------------------------------

# vmlinux is built from the objects selected by $(vmlinux-init) and

# $(vmlinux-main). Most are built-in.o files from top-level directories

# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.

# Ordering when linking is important, and $(vmlinux-init) must be first.

#

# vmlinux

#   ^

#   |

#   +-< $(vmlinux-init)

#   |   +--< init/version.o + more

#   |

#   +--< $(vmlinux-main)

#   |    +--< driver/built-in.o mm/built-in.o + more

#   |

#   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)

#

# vmlinux version (uname -v) cannot be updated during normal

# descending-into-subdirs phase since we do not yet know if we need to

# update vmlinux.

# Therefore this step is delayed until just before final link of vmlinux -

# except in the kallsyms case where it is done just before adding the

# symbols to the kernel.

#

# System.map is generated to document addresses of all kernel symbols



vmlinux-init := $(head-y) $(init-y)

vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)

vmlinux-all  := $(vmlinux-init) $(vmlinux-main)

vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds

export KBUILD_VMLINUX_OBJS := $(vmlinux-all)



# Rule to link vmlinux - also used during CONFIG_KALLSYMS

# May be overridden by arch/$(ARCH)/Makefile

quiet_cmd_vmlinux__ ?= LD      $@

      cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \

      -T $(vmlinux-lds) $(vmlinux-init)                          \

      --start-group $(vmlinux-main) --end-group                  \

      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)



# Generate new vmlinux version

quiet_cmd_vmlinux_version = GEN     .version

      cmd_vmlinux_version = set -e;                     \

	if [ ! -r .version ]; then			\

	  rm -f .version;				\

	  echo 1 >.version;				\

	else						\

	  mv .version .old_version;			\

	  expr 0$$(cat .old_version) + 1 >.version;	\

	fi;						\

	$(MAKE) $(build)=init



# Generate System.map

quiet_cmd_sysmap = SYSMAP

      cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap



# Sort exception table at build time

quiet_cmd_sortextable = SORTEX

      cmd_sortextable = $(objtree)/scripts/sortextable



# Link of vmlinux

# If CONFIG_KALLSYMS is set .version is already updated

# Generate System.map and verify that the content is consistent

# Use + in front of the vmlinux_version rule to silent warning with make -j2

# First command is ':' to allow us to use + in front of the rule

define rule_vmlinux__

	:

	$(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))



	$(call cmd,vmlinux__)

	$(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd



	$(if $(CONFIG_BUILDTIME_EXTABLE_SORT),				\

	  $(Q)$(if $($(quiet)cmd_sortextable),				\

	    echo '  $($(quiet)cmd_sortextable)  vmlinux' &&)		\

	  $(cmd_sortextable)  vmlinux)





	$(Q)$(if $($(quiet)cmd_sysmap),                                      \

	  echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \

	$(cmd_sysmap) $@ System.map;                                         \

	if [ $$? -ne 0 ]; then                                               \

		rm -f $@;                                                    \

		/bin/false;                                                  \

	fi;

	$(verify_kallsyms)

endef





ifdef CONFIG_KALLSYMS

# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)

# It's a three stage process:

# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is

#   empty

#   Running kallsyms on that gives us .tmp_kallsyms1.o with

#   the right size - vmlinux version (uname -v) is updated during this step

# o .tmp_vmlinux2 now has a __kallsyms section of the right size,

#   but due to the added section, some addresses have shifted.

#   From here, we generate a correct .tmp_kallsyms2.o

# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.

# o Verify that the System.map from vmlinux matches the map from

#   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.

# o If 'make KALLSYMS_EXTRA_PASS=1" was used, do an extra pass using

#   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a

#   temporary bypass to allow the kernel to be built while the

#   maintainers work out what went wrong with kallsyms.



last_kallsyms := 2



ifdef KALLSYMS_EXTRA_PASS

ifneq ($(KALLSYMS_EXTRA_PASS),0)

last_kallsyms := 3

endif

endif



kallsyms.o := .tmp_kallsyms$(last_kallsyms).o



define verify_kallsyms

	$(Q)$(if $($(quiet)cmd_sysmap),                                      \

	  echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \

	  $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map

	$(Q)cmp -s System.map .tmp_System.map ||                             \

		(echo Inconsistent kallsyms data;                            \

		 echo This is a bug - please report about it;                \

		 echo Try "make KALLSYMS_EXTRA_PASS=1" as a workaround;      \

		 rm .tmp_kallsyms* ; /bin/false )

endef



# Update vmlinux version before link

# Use + in front of this rule to silent warning about make -j1

# First command is ':' to allow us to use + in front of this rule

cmd_ksym_ld = $(cmd_vmlinux__)

define rule_ksym_ld

	: 

	+$(call cmd,vmlinux_version)

	$(call cmd,vmlinux__)

	$(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd

endef

# Externally visible symbols (used by link-vmlinux.sh)

export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)

export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)

export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds

export LDFLAGS_vmlinux



# Generate .S file with all kernel symbols

quiet_cmd_kallsyms = KSYM    $@

      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \

                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@

vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)



.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE

	$(call if_changed_dep,as_o_S)

# Final link of vmlinux

      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)

quiet_cmd_link-vmlinux = LINK    $@



.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)

	$(call cmd,kallsyms)



# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version

.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE

	$(call if_changed_rule,ksym_ld)



.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE

	$(call if_changed,vmlinux__)



.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE

	$(call if_changed,vmlinux__)



# Needs to visit scripts/ before $(KALLSYMS) can be used.

$(KALLSYMS): scripts ;



# Generate some data for debugging strange kallsyms problems

debug_kallsyms: .tmp_map$(last_kallsyms)



.tmp_map%: .tmp_vmlinux% FORCE

	($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@



.tmp_map3: .tmp_map2



.tmp_map2: .tmp_map1



endif # ifdef CONFIG_KALLSYMS



# Do modpost on a prelinked vmlinux. The finally linked vmlinux has

# relevant sections renamed as per the linker script.

quiet_cmd_vmlinux-modpost = LD      $@

      cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \

	 $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \

	 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)

define rule_vmlinux-modpost

	:

	+$(call cmd,vmlinux-modpost)

	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@

	$(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd

endef



# vmlinux image - including updated kernel symbols

vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE

# Include targets which we want to

# execute if the rest of the kernel build went well.

vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE

ifdef CONFIG_HEADERS_CHECK

	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check

endif
@@ -939,22 +758,11 @@ endif 
ifdef CONFIG_BUILD_DOCSRC

	$(Q)$(MAKE) $(build)=Documentation

endif

	$(call vmlinux-modpost)

	$(call if_changed_rule,vmlinux__)

	$(Q)rm -f .old_version



# build vmlinux.o first to catch section mismatch errors early

ifdef CONFIG_KALLSYMS

.tmp_vmlinux1: vmlinux.o

endif



modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))

vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE

	$(call if_changed_rule,vmlinux-modpost)

	+$(call if_changed,link-vmlinux)



# The actual objects are generated when descending, 

# make sure no implicit rule kicks in

$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;

$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;



# Handle descending into subdirectories listed in $(vmlinux-dirs)

# Preset locale variables to speed up the build process. Limit locale
@@ -1181,8 +989,6 @@ endif # CONFIG_MODULES 


# Directories & files removed with 'make clean'

CLEAN_DIRS  += $(MODVERDIR)

CLEAN_FILES +=	vmlinux System.map \

                .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map



# Directories & files removed with 'make mrproper'

MRPROPER_DIRS  += include/config usr/include include/generated          \
@@ -1428,6 +1234,7 @@ scripts: ; 
endif # KBUILD_EXTMOD



clean: $(clean-dirs)

	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean

	$(call cmd,rmdirs)

	$(call cmd,rmfiles)

	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
@@ -1568,14 +1375,6 @@ quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 
cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \

                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)



a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \

	  $(KBUILD_AFLAGS_KERNEL)                              \

	  $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \

	  $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)



quiet_cmd_as_o_S = AS      $@

cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<



# read all saved command lines



targets := $(wildcard $(sort $(targets)))

arch/mips/Makefile

+2 −2
Original line number Diff line number Diff line
@@ -219,8 +219,8 @@ endif 


KBUILD_AFLAGS	+= $(cflags-y)

KBUILD_CFLAGS	+= $(cflags-y)

KBUILD_CPPFLAGS += -D"VMLINUX_LOAD_ADDRESS=$(load-y)"

KBUILD_CPPFLAGS += -D"DATAOFFSET=$(if $(dataoffset-y),$(dataoffset-y),0)"

KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)

KBUILD_CPPFLAGS += -DDATAOFFSET=$(if $(dataoffset-y),$(dataoffset-y),0)



LDFLAGS			+= -m $(ld-emul)

arch/um/Makefile

+2 −9
Original line number Diff line number Diff line
@@ -121,15 +121,8 @@ LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc 


LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))



CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)

define cmd_vmlinux__

	$(CC) $(CFLAGS_vmlinux) -o $@ \

	-Wl,-T,$(vmlinux-lds) $(vmlinux-init) \

	-Wl,--start-group $(vmlinux-main) -Wl,--end-group \

	-lutil \

	$(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o \

	FORCE ,$^) ; rm -f linux

endef

# Used by link-vmlinux.sh which has special support for um link

export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)



# When cleaning we don't include .config, so we don't include

# TT or skas makefiles and don't clean skas_ptregs.h.

scripts/link-vmlinux.sh

0 → 100644
+221 −0
Original line number Diff line number Diff line 
#!/bin/sh

#

# link vmlinux

#

# vmlinux is linked from the objects selected by $(KBUILD_VMLINUX_INIT) and

# $(KBUILD_VMLINUX_MAIN). Most are built-in.o files from top-level directories

# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.

# Ordering when linking is important, and $(KBUILD_VMLINUX_INIT) must be first.

#

# vmlinux

#   ^

#   |

#   +-< $(KBUILD_VMLINUX_INIT)

#   |   +--< init/version.o + more

#   |

#   +--< $(KBUILD_VMLINUX_MAIN)

#   |    +--< drivers/built-in.o mm/built-in.o + more

#   |

#   +-< ${kallsymso} (see description in KALLSYMS section)

#

# vmlinux version (uname -v) cannot be updated during normal

# descending-into-subdirs phase since we do not yet know if we need to

# update vmlinux.

# Therefore this step is delayed until just before final link of vmlinux.

#

# System.map is generated to document addresses of all kernel symbols



# Error out on error

set -e



# Nice output in kbuild format

# Will be supressed by "make -s"

info()

{

	if [ "${quiet}" != "silent_" ]; then

		printf "  %-7s %s\n" ${1} ${2}

	fi

}



# Link of vmlinux.o used for section mismatch analysis

# ${1} output file

modpost_link()

{

	${LD} ${LDFLAGS} -r -o ${1} ${KBUILD_VMLINUX_INIT}                   \

		--start-group ${KBUILD_VMLINUX_MAIN} --end-group

}



# Link of vmlinux

# ${1} - optional extra .o files

# ${2} - output file

vmlinux_link()

{

	local lds="${objtree}/${KBUILD_LDS}"



	if [ "${SRCARCH}" != "um" ]; then

		${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o ${2}                  \

			-T ${lds} ${KBUILD_VMLINUX_INIT}                     \

			--start-group ${KBUILD_VMLINUX_MAIN} --end-group ${1}

	else

		${CC} ${CFLAGS_vmlinux} -o ${2}                              \

			-Wl,-T,${lds} ${KBUILD_VMLINUX_INIT}                 \

			-Wl,--start-group                                    \

				 ${KBUILD_VMLINUX_MAIN}                      \

			-Wl,--end-group                                      \

			-lutil ${1}

		rm -f linux

	fi

}





# Create ${2} .o file with all symbols from the ${1} object file

kallsyms()

{

	info KSYM ${2}

	local kallsymopt;



	if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then

		kallsymopt=--all-symbols

	fi



	local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL}               \

		      ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"



	${NM} -n ${1} | \

		scripts/kallsyms ${kallsymopt} | \

		${CC} ${aflags} -c -o ${2} -x assembler-with-cpp -

}



# Create map file with all symbols from ${1}

# See mksymap for additional details

mksysmap()

{

	${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2}

}



sortextable()

{

	${objtree}/scripts/sortextable ${1}

}



# Delete output files in case of error

trap cleanup SIGHUP SIGINT SIGQUIT SIGTERM ERR

cleanup()

{

	rm -f .old_version

	rm -f .tmp_System.map

	rm -f .tmp_kallsyms*

	rm -f .tmp_version

	rm -f .tmp_vmlinux*

	rm -f System.map

	rm -f vmlinux

	rm -f vmlinux.o

}



#

#

# Use "make V=1" to debug this script

case "${KBUILD_VERBOSE}" in

*1*)

	set -x

	;;

esac



if [ "$1" = "clean" ]; then

	cleanup

	exit 0

fi



# We need access to CONFIG_ symbols

. ./.config



#link vmlinux.o

info LD vmlinux.o

modpost_link vmlinux.o



# modpost vmlinux.o to check for section mismatches

${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o



# Update version

info GEN .version

if [ ! -r .version ]; then

	rm -f .version;

	echo 1 >.version;

else

	mv .version .old_version;

	expr 0$(cat .old_version) + 1 >.version;

fi;



# final build of init/

${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init



kallsymso=""

kallsyms_vmlinux=""

if [ -n "${CONFIG_KALLSYMS}" ]; then



	# kallsyms support

	# Generate section listing all symbols and add it into vmlinux

	# It's a three step process:

	# 1)  Link .tmp_vmlinux1 so it has all symbols and sections,

	#     but __kallsyms is empty.

	#     Running kallsyms on that gives us .tmp_kallsyms1.o with

	#     the right size

	# 2)  Link .tmp_vmlinux2 so it now has a __kallsyms section of

	#     the right size, but due to the added section, some

	#     addresses have shifted.

	#     From here, we generate a correct .tmp_kallsyms2.o

	# 2a) We may use an extra pass as this has been necessary to

	#     woraround some alignment related bugs.

	#     KALLSYMS_EXTRA_PASS=1 is used to trigger this.

	# 3)  The correct ${kallsymso} is linked into the final vmlinux.

	#

	# a)  Verify that the System.map from vmlinux matches the map from

	#     ${kallsymso}.



	kallsymso=.tmp_kallsyms2.o

	kallsyms_vmlinux=.tmp_vmlinux2



	# step 1

	vmlinux_link "" .tmp_vmlinux1

	kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o



	# step 2

	vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2

	kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o



	# step 2a

	if [ -n "${KALLSYMS_EXTRA_PASS}" ]; then

		kallsymso=.tmp_kallsyms3.o

		kallsyms_vmlinux=.tmp_vmlinux3



		vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3



		kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o

	fi

fi



info LD vmlinux

vmlinux_link "${kallsymso}" vmlinux



if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then

	info SORTEX vmlinux

	sortextable vmlinux

fi



info SYSMAP System.map

mksysmap vmlinux System.map



# step a (see comment above)

if [ -n "${CONFIG_KALLSYMS}" ]; then

	mksysmap ${kallsyms_vmlinux} .tmp_System.map



	if ! cmp -s System.map .tmp_System.map; then

		echo Inconsistent kallsyms data

		echo echo Try "make KALLSYMS_EXTRA_PASS=1" as a workaround

		cleanup

		exit 1

	fi

fi



# We made a new kernel - delete old version file

rm -f .old_version

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