1#
  2# Building vDSO images for sparc.
  3#
  4
  5KBUILD_CFLAGS += $(DISABLE_LTO)
  6
  7VDSO64-$(CONFIG_SPARC64)	:= y
  8VDSOCOMPAT-$(CONFIG_COMPAT)	:= y
  9
 10# files to link into the vdso
 11vobjs-y := vdso-note.o vclock_gettime.o
 12
 13# files to link into kernel
 14obj-y				+= vma.o
 15
 16# vDSO images to build
 17vdso_img-$(VDSO64-y)		+= 64
 18vdso_img-$(VDSOCOMPAT-y)	+= 32
 19
 20vobjs := $(foreach F,$(vobjs-y),$(obj)/$F)
 21
 22$(obj)/vdso.o: $(obj)/vdso.so
 23
 24targets += vdso.lds $(vobjs-y)
 25
 26# Build the vDSO image C files and link them in.
 27vdso_img_objs := $(vdso_img-y:%=vdso-image-%.o)
 28vdso_img_cfiles := $(vdso_img-y:%=vdso-image-%.c)
 29vdso_img_sodbg := $(vdso_img-y:%=vdso%.so.dbg)
 30obj-y += $(vdso_img_objs)
 31targets += $(vdso_img_cfiles)
 32targets += $(vdso_img_sodbg) $(vdso_img-y:%=vdso%.so)
 33
 34export CPPFLAGS_vdso.lds += -P -C
 35
 36VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \
 37			-Wl,--no-undefined \
 38			-Wl,-z,max-page-size=8192 -Wl,-z,common-page-size=8192 \
 39			$(DISABLE_LTO)
 40
 41$(obj)/vdso64.so.dbg: $(src)/vdso.lds $(vobjs) FORCE
 42	$(call if_changed,vdso)
 43
 44HOST_EXTRACFLAGS += -I$(srctree)/tools/include
 45hostprogs-y			+= vdso2c
 46
 47quiet_cmd_vdso2c = VDSO2C  $@
 48define cmd_vdso2c
 49	$(obj)/vdso2c $< $(<:%.dbg=%) $@
 50endef
 51
 52$(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE
 53	$(call if_changed,vdso2c)
 54
 55#
 56# Don't omit frame pointers for ease of userspace debugging, but do
 57# optimize sibling calls.
 58#
 59CFL := $(PROFILING) -mcmodel=medlow -fPIC -O2 -fasynchronous-unwind-tables \
 60       -m64 -ffixed-g2 -ffixed-g3 -fcall-used-g4 -fcall-used-g5 -ffixed-g6 \
 61       -ffixed-g7 $(filter -g%,$(KBUILD_CFLAGS)) \
 62       $(call cc-option, -fno-stack-protector) -fno-omit-frame-pointer \
 63       -foptimize-sibling-calls -DBUILD_VDSO
 64
 65$(vobjs): KBUILD_CFLAGS += $(CFL)
 66
 67#
 68# vDSO code runs in userspace and -pg doesn't help with profiling anyway.
 69#
 70CFLAGS_REMOVE_vdso-note.o = -pg
 71CFLAGS_REMOVE_vclock_gettime.o = -pg
 72
 73$(obj)/%.so: OBJCOPYFLAGS := -S
 74$(obj)/%.so: $(obj)/%.so.dbg
 75	$(call if_changed,objcopy)
 76
 77CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds)
 78VDSO_LDFLAGS_vdso32.lds = -m32 -Wl,-m,elf32_sparc,-soname=linux-gate.so.1
 79
 80#This makes sure the $(obj) subdirectory exists even though vdso32
 81#is not a kbuild sub-make subdirectory
 82override obj-dirs = $(dir $(obj)) $(obj)/vdso32/
 83
 84targets += vdso32/vdso32.lds
 85targets += vdso32/vdso-note.o
 86targets += vdso32/vclock_gettime.o
 87
 88KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) -DBUILD_VDSO
 89$(obj)/vdso32.so.dbg: KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
 90$(obj)/vdso32.so.dbg: asflags-$(CONFIG_SPARC64) += -m32
 91
 92KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
 93KBUILD_CFLAGS_32 := $(filter-out -mcmodel=medlow,$(KBUILD_CFLAGS_32))
 94KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
 95KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32))
 96KBUILD_CFLAGS_32 += -m32 -msoft-float -fpic -mno-app-regs -ffixed-g7
 97KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector)
 98KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
 99KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
100KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING
101KBUILD_CFLAGS_32 += -mv8plus
102$(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
103
104$(obj)/vdso32.so.dbg: FORCE \
105			$(obj)/vdso32/vdso32.lds \
106			$(obj)/vdso32/vclock_gettime.o \
107			$(obj)/vdso32/vdso-note.o
108		$(call	if_changed,vdso)
109
110#
111# The DSO images are built using a special linker script.
112#
113quiet_cmd_vdso = VDSO    $@
114      cmd_vdso = $(CC) -nostdlib -o $@ \
115		       $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
116		       -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^)
117
118VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) \
119	$(call cc-ldoption, -Wl$(comma)--build-id) -Wl,-Bsymbolic
120GCOV_PROFILE := n
121
122#
123# Install the unstripped copies of vdso*.so.  If our toolchain supports
124# build-id, install .build-id links as well.
125#
126quiet_cmd_vdso_install = INSTALL $(@:install_%=%)
127define cmd_vdso_install
128	cp $< "$(MODLIB)/vdso/$(@:install_%=%)"; \
129	if readelf -n $< |grep -q 'Build ID'; then \
130	  buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \
131	  first=`echo $$buildid | cut -b-2`; \
132	  last=`echo $$buildid | cut -b3-`; \
133	  mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
134	  ln -sf "../../$(@:install_%=%)" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
135	fi
136endef
137
138vdso_img_insttargets := $(vdso_img_sodbg:%.dbg=install_%)
139
140$(MODLIB)/vdso: FORCE
141	@mkdir -p $(MODLIB)/vdso
142
143$(vdso_img_insttargets): install_%: $(obj)/%.dbg $(MODLIB)/vdso FORCE
144	$(call cmd,vdso_install)
145
146PHONY += vdso_install $(vdso_img_insttargets)
147vdso_install: $(vdso_img_insttargets) FORCE