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) 33.SECONDARY: $(vdso_img-y:%=$(obj)/vdso-image-%.c) \ 34 $(vdso_img-y:%=$(obj)/vdso%.so) 35 36export CPPFLAGS_vdso.lds += -P -C 37 38VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \ 39 -Wl,--no-undefined \ 40 -Wl,-z,max-page-size=8192 -Wl,-z,common-page-size=8192 \ 41 $(DISABLE_LTO) 42 43$(obj)/vdso64.so.dbg: $(src)/vdso.lds $(vobjs) FORCE 44 $(call if_changed,vdso) 45 46HOST_EXTRACFLAGS += -I$(srctree)/tools/include 47hostprogs-y += vdso2c 48 49quiet_cmd_vdso2c = VDSO2C $@ 50define cmd_vdso2c 51 $(obj)/vdso2c $< $(<:%.dbg=%) $@ 52endef 53 54$(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE 55 $(call if_changed,vdso2c) 56 57# 58# Don't omit frame pointers for ease of userspace debugging, but do 59# optimize sibling calls. 60# 61CFL := $(PROFILING) -mcmodel=medlow -fPIC -O2 -fasynchronous-unwind-tables \ 62 -m64 -ffixed-g2 -ffixed-g3 -fcall-used-g4 -fcall-used-g5 -ffixed-g6 \ 63 -ffixed-g7 $(filter -g%,$(KBUILD_CFLAGS)) \ 64 $(call cc-option, -fno-stack-protector) -fno-omit-frame-pointer \ 65 -foptimize-sibling-calls -DBUILD_VDSO 66 67$(vobjs): KBUILD_CFLAGS += $(CFL) 68 69# 70# vDSO code runs in userspace and -pg doesn't help with profiling anyway. 71# 72CFLAGS_REMOVE_vdso-note.o = -pg 73CFLAGS_REMOVE_vclock_gettime.o = -pg 74 75$(obj)/%.so: OBJCOPYFLAGS := -S 76$(obj)/%.so: $(obj)/%.so.dbg 77 $(call if_changed,objcopy) 78 79CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds) 80VDSO_LDFLAGS_vdso32.lds = -m32 -Wl,-m,elf32_sparc,-soname=linux-gate.so.1 81 82#This makes sure the $(obj) subdirectory exists even though vdso32/ 83#is not a kbuild sub-make subdirectory 84override obj-dirs = $(dir $(obj)) $(obj)/vdso32/ 85 86targets += vdso32/vdso32.lds 87targets += vdso32/vdso-note.o 88targets += vdso32/vclock_gettime.o 89 90KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) -DBUILD_VDSO 91$(obj)/vdso32.so.dbg: KBUILD_AFLAGS = $(KBUILD_AFLAGS_32) 92$(obj)/vdso32.so.dbg: asflags-$(CONFIG_SPARC64) += -m32 93 94KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS)) 95KBUILD_CFLAGS_32 := $(filter-out -mcmodel=medlow,$(KBUILD_CFLAGS_32)) 96KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32)) 97KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32)) 98KBUILD_CFLAGS_32 += -m32 -msoft-float -fpic -mno-app-regs -ffixed-g7 99KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector) 100KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls) 101KBUILD_CFLAGS_32 += -fno-omit-frame-pointer 102KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING 103KBUILD_CFLAGS_32 += -mv8plus 104$(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32) 105 106$(obj)/vdso32.so.dbg: FORCE \ 107 $(obj)/vdso32/vdso32.lds \ 108 $(obj)/vdso32/vclock_gettime.o \ 109 $(obj)/vdso32/vdso-note.o 110 $(call if_changed,vdso) 111 112# 113# The DSO images are built using a special linker script. 114# 115quiet_cmd_vdso = VDSO $@ 116 cmd_vdso = $(CC) -nostdlib -o $@ \ 117 $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \ 118 -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) 119 120VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) \ 121 $(call cc-ldoption, -Wl$(comma)--build-id) -Wl,-Bsymbolic 122GCOV_PROFILE := n 123 124# 125# Install the unstripped copies of vdso*.so. If our toolchain supports 126# build-id, install .build-id links as well. 127# 128quiet_cmd_vdso_install = INSTALL $(@:install_%=%) 129define cmd_vdso_install 130 cp $< "$(MODLIB)/vdso/$(@:install_%=%)"; \ 131 if readelf -n $< |grep -q 'Build ID'; then \ 132 buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \ 133 first=`echo $$buildid | cut -b-2`; \ 134 last=`echo $$buildid | cut -b3-`; \ 135 mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \ 136 ln -sf "../../$(@:install_%=%)" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \ 137 fi 138endef 139 140vdso_img_insttargets := $(vdso_img_sodbg:%.dbg=install_%) 141 142$(MODLIB)/vdso: FORCE 143 @mkdir -p $(MODLIB)/vdso 144 145$(vdso_img_insttargets): install_%: $(obj)/%.dbg $(MODLIB)/vdso FORCE 146 $(call cmd,vdso_install) 147 148PHONY += vdso_install $(vdso_img_insttargets) 149vdso_install: $(vdso_img_insttargets) FORCE 150