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 148