[linux-2.6-block.git] / arch / x86 / entry / vdso / Makefile

#
# Building vDSO images for x86.
#

KBUILD_CFLAGS += $(DISABLE_LTO)
KASAN_SANITIZE			:= n
UBSAN_SANITIZE			:= n
OBJECT_FILES_NON_STANDARD	:= y

# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
KCOV_INSTRUMENT		:= n

VDSO64-$(CONFIG_X86_64)		:= y
VDSOX32-$(CONFIG_X86_X32_ABI)	:= y
VDSO32-$(CONFIG_X86_32)		:= y
VDSO32-$(CONFIG_IA32_EMULATION)	:= y

# files to link into the vdso
vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o

# files to link into kernel
obj-y				+= vma.o
OBJECT_FILES_NON_STANDARD_vma.o	:= n

# vDSO images to build
vdso_img-$(VDSO64-y)		+= 64
vdso_img-$(VDSOX32-y)		+= x32
vdso_img-$(VDSO32-y)		+= 32

obj-$(VDSO32-y)			+= vdso32-setup.o

vobjs := $(foreach F,$(vobjs-y),$(obj)/$F)

$(obj)/vdso.o: $(obj)/vdso.so

targets += vdso.lds $(vobjs-y)

# Build the vDSO image C files and link them in.
vdso_img_objs := $(vdso_img-y:%=vdso-image-%.o)
vdso_img_cfiles := $(vdso_img-y:%=vdso-image-%.c)
vdso_img_sodbg := $(vdso_img-y:%=vdso%.so.dbg)
obj-y += $(vdso_img_objs)
targets += $(vdso_img_cfiles)
targets += $(vdso_img_sodbg)
.SECONDARY: $(vdso_img-y:%=$(obj)/vdso-image-%.c) \
	$(vdso_img-y:%=$(obj)/vdso%.so)

export CPPFLAGS_vdso.lds += -P -C

VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \
			-Wl,--no-undefined \
			-Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096 \
			$(DISABLE_LTO)

$(obj)/vdso64.so.dbg: $(src)/vdso.lds $(vobjs) FORCE
	$(call if_changed,vdso)

HOST_EXTRACFLAGS += -I$(srctree)/tools/include -I$(srctree)/include/uapi -I$(srctree)/arch/x86/include/uapi
hostprogs-y			+= vdso2c

quiet_cmd_vdso2c = VDSO2C  $@
define cmd_vdso2c
	$(obj)/vdso2c $< $(<:%.dbg=%) $@
endef

$(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE
	$(call if_changed,vdso2c)

#
# Don't omit frame pointers for ease of userspace debugging, but do
# optimize sibling calls.
#
CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \
       $(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \
       -fno-omit-frame-pointer -foptimize-sibling-calls \
       -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO

$(vobjs): KBUILD_CFLAGS += $(CFL)

#
# vDSO code runs in userspace and -pg doesn't help with profiling anyway.
#
CFLAGS_REMOVE_vdso-note.o = -pg
CFLAGS_REMOVE_vclock_gettime.o = -pg
CFLAGS_REMOVE_vgetcpu.o = -pg
CFLAGS_REMOVE_vvar.o = -pg

#
# X32 processes use x32 vDSO to access 64bit kernel data.
#
# Build x32 vDSO image:
# 1. Compile x32 vDSO as 64bit.
# 2. Convert object files to x32.
# 3. Build x32 VDSO image with x32 objects, which contains 64bit codes
# so that it can reach 64bit address space with 64bit pointers.
#

CPPFLAGS_vdsox32.lds = $(CPPFLAGS_vdso.lds)
VDSO_LDFLAGS_vdsox32.lds = -Wl,-m,elf32_x86_64 \
			   -Wl,-soname=linux-vdso.so.1 \
			   -Wl,-z,max-page-size=4096 \
			   -Wl,-z,common-page-size=4096

# 64-bit objects to re-brand as x32
vobjs64-for-x32 := $(filter-out $(vobjs-nox32),$(vobjs-y))

# x32-rebranded versions
vobjx32s-y := $(vobjs64-for-x32:.o=-x32.o)

# same thing, but in the output directory
vobjx32s := $(foreach F,$(vobjx32s-y),$(obj)/$F)

# Convert 64bit object file to x32 for x32 vDSO.
quiet_cmd_x32 = X32     $@
      cmd_x32 = $(OBJCOPY) -O elf32-x86-64 $< $@

$(obj)/%-x32.o: $(obj)/%.o FORCE
	$(call if_changed,x32)

targets += vdsox32.lds $(vobjx32s-y)

$(obj)/%.so: OBJCOPYFLAGS := -S
$(obj)/%.so: $(obj)/%.so.dbg
	$(call if_changed,objcopy)

$(obj)/vdsox32.so.dbg: $(src)/vdsox32.lds $(vobjx32s) FORCE
	$(call if_changed,vdso)

CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds)
VDSO_LDFLAGS_vdso32.lds = -m32 -Wl,-m,elf_i386 -Wl,-soname=linux-gate.so.1

# This makes sure the $(obj) subdirectory exists even though vdso32/
# is not a kbuild sub-make subdirectory.
override obj-dirs = $(dir $(obj)) $(obj)/vdso32/

targets += vdso32/vdso32.lds
targets += vdso32/note.o vdso32/vclock_gettime.o vdso32/system_call.o
targets += vdso32/vclock_gettime.o

KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) -DBUILD_VDSO
$(obj)/vdso32.so.dbg: KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
$(obj)/vdso32.so.dbg: asflags-$(CONFIG_X86_64) += -m32

KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
KBUILD_CFLAGS_32 := $(filter-out -mcmodel=kernel,$(KBUILD_CFLAGS_32))
KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
KBUILD_CFLAGS_32 := $(filter-out -mfentry,$(KBUILD_CFLAGS_32))
KBUILD_CFLAGS_32 += -m32 -msoft-float -mregparm=0 -fpic
KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector)
KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING
$(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)

$(obj)/vdso32.so.dbg: FORCE \
		      $(obj)/vdso32/vdso32.lds \
		      $(obj)/vdso32/vclock_gettime.o \
		      $(obj)/vdso32/note.o \
		      $(obj)/vdso32/system_call.o
	$(call if_changed,vdso)

#
# The DSO images are built using a special linker script.
#
quiet_cmd_vdso = VDSO    $@
      cmd_vdso = $(CC) -nostdlib -o $@ \
		       $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
		       -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \
		 sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@'

VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=both) \
	$(call cc-ldoption, -Wl$(comma)--build-id) -Wl,-Bsymbolic $(LTO_CFLAGS)
GCOV_PROFILE := n

#
# Install the unstripped copies of vdso*.so.  If our toolchain supports
# build-id, install .build-id links as well.
#
quiet_cmd_vdso_install = INSTALL $(@:install_%=%)
define cmd_vdso_install
	cp $< "$(MODLIB)/vdso/$(@:install_%=%)"; \
	if readelf -n $< |grep -q 'Build ID'; then \
	  buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \
	  first=`echo $$buildid | cut -b-2`; \
	  last=`echo $$buildid | cut -b3-`; \
	  mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
	  ln -sf "../../$(@:install_%=%)" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
	fi
endef

vdso_img_insttargets := $(vdso_img_sodbg:%.dbg=install_%)

$(MODLIB)/vdso: FORCE
	@mkdir -p $(MODLIB)/vdso

$(vdso_img_insttargets): install_%: $(obj)/%.dbg $(MODLIB)/vdso
	$(call cmd,vdso_install)

PHONY += vdso_install $(vdso_img_insttargets)
vdso_install: $(vdso_img_insttargets)

clean-files := vdso32.so vdso32.so.dbg vdso64* vdso-image-*.c vdsox32.so*
Commit	Line	Data
2aae950b	1	#
0249c9c1	2	# Building vDSO images for x86.
2aae950b AK	3	#
2aae950b AK	4
67424d5a	5	KBUILD_CFLAGS += $(DISABLE_LTO)
c0dd6716 JP	6	KASAN_SANITIZE := n
	7	UBSAN_SANITIZE := n
	8	OBJECT_FILES_NON_STANDARD := y
67424d5a	9
5c9a8750 DV	10	# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
	11	KCOV_INSTRUMENT := n
	12
0249c9c1	13	VDSO64-$(CONFIG_X86_64) := y
1a21d4e0	14	VDSOX32-$(CONFIG_X86_X32_ABI) := y
0249c9c1	15	VDSO32-$(CONFIG_X86_32) := y
ab8b82ee	16	VDSO32-$(CONFIG_IA32_EMULATION) := y
0249c9c1	17
2aae950b	18	# files to link into the vdso
da861e18	19	vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o
1a21d4e0	20
2aae950b	21	# files to link into kernel
b4b541a6	22	obj-y += vma.o
c0dd6716	23	OBJECT_FILES_NON_STANDARD_vma.o := n
6f121e54 AL	24
	25	# vDSO images to build
	26	vdso_img-$(VDSO64-y) += 64
	27	vdso_img-$(VDSOX32-y) += x32
0a6d1fa0	28	vdso_img-$(VDSO32-y) += 32
6f121e54 AL	29
6f121e54 AL	30	obj-$(VDSO32-y) += vdso32-setup.o
2aae950b	31
e0bf7b86	32	vobjs := $(foreach F,$(vobjs-y),$(obj)/$F)
2aae950b AK	33
	34	$(obj)/vdso.o: $(obj)/vdso.so
	35
6f121e54 AL	36	targets += vdso.lds $(vobjs-y)
	37
	38	# Build the vDSO image C files and link them in.
	39	vdso_img_objs := $(vdso_img-y:%=vdso-image-%.o)
	40	vdso_img_cfiles := $(vdso_img-y:%=vdso-image-%.c)
	41	vdso_img_sodbg := $(vdso_img-y:%=vdso%.so.dbg)
	42	obj-y += $(vdso_img_objs)
	43	targets += $(vdso_img_cfiles)
	44	targets += $(vdso_img_sodbg)
da861e18 AL	45	.SECONDARY: $(vdso_img-y:%=$(obj)/vdso-image-%.c) \
da861e18 AL	46	$(vdso_img-y:%=$(obj)/vdso%.so)
2aae950b	47
d746d647	48	export CPPFLAGS_vdso.lds += -P -C
2aae950b	49
de2a8cf9	50	VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \
7f79ad15	51	-Wl,--no-undefined \
67424d5a AK	52	-Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096 \
67424d5a AK	53	$(DISABLE_LTO)
2aae950b	54
6f121e54	55	$(obj)/vdso64.so.dbg: $(src)/vdso.lds $(vobjs) FORCE
16e48e7e	56	$(call if_changed,vdso)
2aae950b	57
ef7254a5	58	HOST_EXTRACFLAGS += -I$(srctree)/tools/include -I$(srctree)/include/uapi -I$(srctree)/arch/x86/include/uapi
6f121e54 AL	59	hostprogs-y += vdso2c
	60
	61	quiet_cmd_vdso2c = VDSO2C $@
	62	define cmd_vdso2c
da861e18	63	$(obj)/vdso2c $< $(<:%.dbg=%) $@
6f121e54 AL	64	endef
6f121e54 AL	65
da861e18	66	$(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE
6f121e54	67	$(call if_changed,vdso2c)
f79eb83b	68
6447facb AL	69	#
	70	# Don't omit frame pointers for ease of userspace debugging, but do
	71	# optimize sibling calls.
	72	#
8705a49c	73	CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \
6447facb	74	$(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \
46b57a76	75	-fno-omit-frame-pointer -foptimize-sibling-calls \
f24f9108	76	-DDISABLE_BRANCH_PROFILING -DBUILD_VDSO
2aae950b	77
f6bc4029	78	$(vobjs): KBUILD_CFLAGS += $(CFL)
2aae950b	79
6447facb AL	80	#
	81	# vDSO code runs in userspace and -pg doesn't help with profiling anyway.
	82	#
	83	CFLAGS_REMOVE_vdso-note.o = -pg
	84	CFLAGS_REMOVE_vclock_gettime.o = -pg
	85	CFLAGS_REMOVE_vgetcpu.o = -pg
	86	CFLAGS_REMOVE_vvar.o = -pg
	87
1a21d4e0 L	88	#
	89	# X32 processes use x32 vDSO to access 64bit kernel data.
	90	#
	91	# Build x32 vDSO image:
	92	# 1. Compile x32 vDSO as 64bit.
	93	# 2. Convert object files to x32.
	94	# 3. Build x32 VDSO image with x32 objects, which contains 64bit codes
	95	# so that it can reach 64bit address space with 64bit pointers.
	96	#
	97
1a21d4e0 L	98	CPPFLAGS_vdsox32.lds = $(CPPFLAGS_vdso.lds)
	99	VDSO_LDFLAGS_vdsox32.lds = -Wl,-m,elf32_x86_64 \
	100	-Wl,-soname=linux-vdso.so.1 \
	101	-Wl,-z,max-page-size=4096 \
	102	-Wl,-z,common-page-size=4096
	103
e0bf7b86 AL	104	# 64-bit objects to re-brand as x32
	105	vobjs64-for-x32 := $(filter-out $(vobjs-nox32),$(vobjs-y))
	106
	107	# x32-rebranded versions
	108	vobjx32s-y := $(vobjs64-for-x32:.o=-x32.o)
	109
	110	# same thing, but in the output directory
1a21d4e0 L	111	vobjx32s := $(foreach F,$(vobjx32s-y),$(obj)/$F)
	112
	113	# Convert 64bit object file to x32 for x32 vDSO.
	114	quiet_cmd_x32 = X32 $@
	115	cmd_x32 = $(OBJCOPY) -O elf32-x86-64 $< $@
	116
	117	$(obj)/%-x32.o: $(obj)/%.o FORCE
	118	$(call if_changed,x32)
	119
6f121e54	120	targets += vdsox32.lds $(vobjx32s-y)
1a21d4e0	121
da861e18 AL	122	$(obj)/%.so: OBJCOPYFLAGS := -S
	123	$(obj)/%.so: $(obj)/%.so.dbg
	124	$(call if_changed,objcopy)
	125
1a21d4e0 L	126	$(obj)/vdsox32.so.dbg: $(src)/vdsox32.lds $(vobjx32s) FORCE
	127	$(call if_changed,vdso)
	128
0249c9c1	129	CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds)
67424d5a	130	VDSO_LDFLAGS_vdso32.lds = -m32 -Wl,-m,elf_i386 -Wl,-soname=linux-gate.so.1
0249c9c1 RM	131
	132	# This makes sure the $(obj) subdirectory exists even though vdso32/
	133	# is not a kbuild sub-make subdirectory.
	134	override obj-dirs = $(dir $(obj)) $(obj)/vdso32/
	135
	136	targets += vdso32/vdso32.lds
0a6d1fa0	137	targets += vdso32/note.o vdso32/vclock_gettime.o vdso32/system_call.o
da861e18	138	targets += vdso32/vclock_gettime.o
0249c9c1	139
f24f9108	140	KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) -DBUILD_VDSO
0a6d1fa0 AL	141	$(obj)/vdso32.so.dbg: KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
0a6d1fa0 AL	142	$(obj)/vdso32.so.dbg: asflags-$(CONFIG_X86_64) += -m32
0249c9c1	143
7a59ed41 SS	144	KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
	145	KBUILD_CFLAGS_32 := $(filter-out -mcmodel=kernel,$(KBUILD_CFLAGS_32))
	146	KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
	147	KBUILD_CFLAGS_32 := $(filter-out -mfentry,$(KBUILD_CFLAGS_32))
	148	KBUILD_CFLAGS_32 += -m32 -msoft-float -mregparm=0 -fpic
008cc907 PA	149	KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector)
	150	KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
	151	KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
46b57a76	152	KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING
0a6d1fa0	153	$(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
7a59ed41	154
0a6d1fa0 AL	155	$(obj)/vdso32.so.dbg: FORCE \
	156	$(obj)/vdso32/vdso32.lds \
	157	$(obj)/vdso32/vclock_gettime.o \
	158	$(obj)/vdso32/note.o \
	159	$(obj)/vdso32/system_call.o
0249c9c1 RM	160	$(call if_changed,vdso)
0249c9c1 RM	161
0249c9c1 RM	162	#
	163	# The DSO images are built using a special linker script.
	164	#
	165	quiet_cmd_vdso = VDSO $@
	166	cmd_vdso = $(CC) -nostdlib -o $@ \
	167	$(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
05d0b088 PA	168	-Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \
05d0b088 PA	169	sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@'
0249c9c1	170
6b7e2654	171	VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=both) \
dda1e95c	172	$(call cc-ldoption, -Wl$(comma)--build-id) -Wl,-Bsymbolic $(LTO_CFLAGS)
7bf99fb6	173	GCOV_PROFILE := n
0249c9c1 RM	174
0249c9c1 RM	175	#
dda1e95c AL	176	# Install the unstripped copies of vdso*.so. If our toolchain supports
dda1e95c AL	177	# build-id, install .build-id links as well.
0249c9c1	178	#
a934fb5b	179	quiet_cmd_vdso_install = INSTALL $(@:install_%=%)
dda1e95c AL	180	define cmd_vdso_install
	181	cp $< "$(MODLIB)/vdso/$(@:install_%=%)"; \
	182	if readelf -n $< \|grep -q 'Build ID'; then \
	183	buildid=`readelf -n $< \|grep 'Build ID' \|sed -e 's/^.Build ID: \(.\)$$/\1/'`; \
	184	first=`echo $$buildid \| cut -b-2`; \
	185	last=`echo $$buildid \| cut -b3-`; \
	186	mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
	187	ln -sf "../../$(@:install_%=%)" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
	188	fi
	189	endef
a934fb5b AL	190
	191	vdso_img_insttargets := $(vdso_img_sodbg:%.dbg=install_%)
	192
	193	$(MODLIB)/vdso: FORCE
f79eb83b	194	@mkdir -p $(MODLIB)/vdso
a934fb5b	195
2e8d696b	196	$(vdso_img_insttargets): install_%: $(obj)/%.dbg $(MODLIB)/vdso
f79eb83b RM	197	$(call cmd,vdso_install)
f79eb83b RM	198
a934fb5b	199	PHONY += vdso_install $(vdso_img_insttargets)
2e8d696b	200	vdso_install: $(vdso_img_insttargets)
d531b4fd	201
0a6d1fa0	202	clean-files := vdso32.so vdso32.so.dbg vdso64* vdso-image-.c vdsox32.so