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) $(vdso_img-y:%=vdso%.so) 33 34CPPFLAGS_vdso.lds += -P -C 35 36VDSO_LDFLAGS_vdso.lds = -m elf64_sparc -soname linux-vdso.so.1 --no-undefined \ 37 -z max-page-size=8192 38 39$(obj)/vdso64.so.dbg: $(obj)/vdso.lds $(vobjs) FORCE 40 $(call if_changed,vdso) 41 42HOST_EXTRACFLAGS += -I$(srctree)/tools/include 43hostprogs-y += vdso2c 44 45quiet_cmd_vdso2c = VDSO2C $@ 46 cmd_vdso2c = $(obj)/vdso2c $< $(<:%.dbg=%) $@ 47 48$(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE 49 $(call if_changed,vdso2c) 50 51# 52# Don't omit frame pointers for ease of userspace debugging, but do 53# optimize sibling calls. 54# 55CFL := $(PROFILING) -mcmodel=medlow -fPIC -O2 -fasynchronous-unwind-tables -m64 \ 56 $(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \ 57 -fno-omit-frame-pointer -foptimize-sibling-calls \ 58 -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO 59 60SPARC_REG_CFLAGS = -ffixed-g4 -ffixed-g5 -fcall-used-g5 -fcall-used-g7 61 62$(vobjs): KBUILD_CFLAGS := $(filter-out $(GCC_PLUGINS_CFLAGS) $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS)) $(CFL) 63 64# 65# vDSO code runs in userspace and -pg doesn't help with profiling anyway. 66# 67CFLAGS_REMOVE_vdso-note.o = -pg 68CFLAGS_REMOVE_vclock_gettime.o = -pg 69 70$(obj)/%.so: OBJCOPYFLAGS := -S 71$(obj)/%.so: $(obj)/%.so.dbg FORCE 72 $(call if_changed,objcopy) 73 74CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds) 75VDSO_LDFLAGS_vdso32.lds = -m elf32_sparc -soname linux-gate.so.1 76 77#This makes sure the $(obj) subdirectory exists even though vdso32/ 78#is not a kbuild sub-make subdirectory 79override obj-dirs = $(dir $(obj)) $(obj)/vdso32/ 80 81targets += vdso32/vdso32.lds 82targets += vdso32/vdso-note.o 83targets += vdso32/vclock_gettime.o 84 85KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) -DBUILD_VDSO 86$(obj)/vdso32.so.dbg: KBUILD_AFLAGS = $(KBUILD_AFLAGS_32) 87$(obj)/vdso32.so.dbg: asflags-$(CONFIG_SPARC64) += -m32 88 89KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS)) 90KBUILD_CFLAGS_32 := $(filter-out -mcmodel=medlow,$(KBUILD_CFLAGS_32)) 91KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32)) 92KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32)) 93KBUILD_CFLAGS_32 := $(filter-out $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS_32)) 94KBUILD_CFLAGS_32 += -m32 -msoft-float -fpic 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 = $(LD) -nostdlib -o $@ \ 113 $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \ 114 -T $(filter %.lds,$^) $(filter %.o,$^) && \ 115 sh $(srctree)/$(src)/checkundef.sh '$(OBJDUMP)' '$@' 116 117VDSO_LDFLAGS = -shared $(call ld-option, --hash-style=both) \ 118 $(call ld-option, --build-id) -Bsymbolic 119GCOV_PROFILE := n 120 121# 122# Install the unstripped copies of vdso*.so. If our toolchain supports 123# build-id, install .build-id links as well. 124# 125quiet_cmd_vdso_install = INSTALL $(@:install_%=%) 126define cmd_vdso_install 127 cp $< "$(MODLIB)/vdso/$(@:install_%=%)"; \ 128 if readelf -n $< |grep -q 'Build ID'; then \ 129 buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \ 130 first=`echo $$buildid | cut -b-2`; \ 131 last=`echo $$buildid | cut -b3-`; \ 132 mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \ 133 ln -sf "../../$(@:install_%=%)" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \ 134 fi 135endef 136 137vdso_img_insttargets := $(vdso_img_sodbg:%.dbg=install_%) 138 139$(MODLIB)/vdso: FORCE 140 @mkdir -p $(MODLIB)/vdso 141 142$(vdso_img_insttargets): install_%: $(obj)/%.dbg $(MODLIB)/vdso FORCE 143 $(call cmd,vdso_install) 144 145PHONY += vdso_install $(vdso_img_insttargets) 146vdso_install: $(vdso_img_insttargets) FORCE 147