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 34CPPFLAGS_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: $(obj)/vdso.lds $(vobjs) FORCE 42 $(call if_changed,vdso) 43 44HOST_EXTRACFLAGS += -I$(srctree)/tools/include 45hostprogs-y += vdso2c 46 47quiet_cmd_vdso2c = VDSO2C $@ 48 cmd_vdso2c = $(obj)/vdso2c $< $(<:%.dbg=%) $@ 49 50$(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE 51 $(call if_changed,vdso2c) 52 53# 54# Don't omit frame pointers for ease of userspace debugging, but do 55# optimize sibling calls. 56# 57CFL := $(PROFILING) -mcmodel=medlow -fPIC -O2 -fasynchronous-unwind-tables \ 58 -m64 -ffixed-g2 -ffixed-g3 -fcall-used-g4 -fcall-used-g5 -ffixed-g6 \ 59 -ffixed-g7 $(filter -g%,$(KBUILD_CFLAGS)) \ 60 $(call cc-option, -fno-stack-protector) -fno-omit-frame-pointer \ 61 -foptimize-sibling-calls -DBUILD_VDSO 62 63$(vobjs): KBUILD_CFLAGS += $(CFL) 64 65# 66# vDSO code runs in userspace and -pg doesn't help with profiling anyway. 67# 68CFLAGS_REMOVE_vdso-note.o = -pg 69CFLAGS_REMOVE_vclock_gettime.o = -pg 70 71$(obj)/%.so: OBJCOPYFLAGS := -S 72$(obj)/%.so: $(obj)/%.so.dbg 73 $(call if_changed,objcopy) 74 75CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds) 76VDSO_LDFLAGS_vdso32.lds = -m32 -Wl,-m,elf32_sparc,-soname=linux-gate.so.1 77 78#This makes sure the $(obj) subdirectory exists even though vdso32/ 79#is not a kbuild sub-make subdirectory 80override obj-dirs = $(dir $(obj)) $(obj)/vdso32/ 81 82targets += vdso32/vdso32.lds 83targets += vdso32/vdso-note.o 84targets += vdso32/vclock_gettime.o 85 86KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) -DBUILD_VDSO 87$(obj)/vdso32.so.dbg: KBUILD_AFLAGS = $(KBUILD_AFLAGS_32) 88$(obj)/vdso32.so.dbg: asflags-$(CONFIG_SPARC64) += -m32 89 90KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS)) 91KBUILD_CFLAGS_32 := $(filter-out -mcmodel=medlow,$(KBUILD_CFLAGS_32)) 92KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32)) 93KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32)) 94KBUILD_CFLAGS_32 += -m32 -msoft-float -fpic -mno-app-regs -ffixed-g7 95KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector) 96KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls) 97KBUILD_CFLAGS_32 += -fno-omit-frame-pointer 98KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING 99KBUILD_CFLAGS_32 += -mv8plus 100$(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32) 101 102$(obj)/vdso32.so.dbg: FORCE \ 103 $(obj)/vdso32/vdso32.lds \ 104 $(obj)/vdso32/vclock_gettime.o \ 105 $(obj)/vdso32/vdso-note.o 106 $(call if_changed,vdso) 107 108# 109# The DSO images are built using a special linker script. 110# 111quiet_cmd_vdso = VDSO $@ 112 cmd_vdso = $(CC) -nostdlib -o $@ \ 113 $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \ 114 -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) 115 116VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) \ 117 $(call cc-ldoption, -Wl$(comma)--build-id) -Wl,-Bsymbolic 118GCOV_PROFILE := n 119 120# 121# Install the unstripped copies of vdso*.so. If our toolchain supports 122# build-id, install .build-id links as well. 123# 124quiet_cmd_vdso_install = INSTALL $(@:install_%=%) 125define cmd_vdso_install 126 cp $< "$(MODLIB)/vdso/$(@:install_%=%)"; \ 127 if readelf -n $< |grep -q 'Build ID'; then \ 128 buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \ 129 first=`echo $$buildid | cut -b-2`; \ 130 last=`echo $$buildid | cut -b3-`; \ 131 mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \ 132 ln -sf "../../$(@:install_%=%)" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \ 133 fi 134endef 135 136vdso_img_insttargets := $(vdso_img_sodbg:%.dbg=install_%) 137 138$(MODLIB)/vdso: FORCE 139 @mkdir -p $(MODLIB)/vdso 140 141$(vdso_img_insttargets): install_%: $(obj)/%.dbg $(MODLIB)/vdso FORCE 142 $(call cmd,vdso_install) 143 144PHONY += vdso_install $(vdso_img_insttargets) 145vdso_install: $(vdso_img_insttargets) FORCE 146