# # Building vDSO images for x86. # VDSO64-$(CONFIG_X86_64) := y VDSO32-$(CONFIG_X86_32) := y VDSO32-$(CONFIG_COMPAT) := y vdso-install-$(VDSO64-y) += vdso.so vdso-install-$(VDSO32-y) += $(vdso32-images) # files to link into the vdso vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o vvar.o # files to link into kernel obj-$(VDSO64-y) += vma.o vdso.o obj-$(VDSO32-y) += vdso32.o vdso32-setup.o vobjs := $(foreach F,$(vobjs-y),$(obj)/$F) $(obj)/vdso.o: $(obj)/vdso.so targets += vdso.so vdso.so.dbg vdso.lds $(vobjs-y) export CPPFLAGS_vdso.lds += -P -C VDSO_LDFLAGS_vdso.lds = -m elf_x86_64 -Wl,-soname=linux-vdso.so.1 \ -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096 $(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so $(obj)/vdso.so.dbg: $(src)/vdso.lds $(vobjs) FORCE $(call if_changed,vdso) $(obj)/%.so: OBJCOPYFLAGS := -S $(obj)/%.so: $(obj)/%.so.dbg FORCE $(call if_changed,objcopy) CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \ $(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) $(vobjs): KBUILD_CFLAGS += $(CFL) targets += vdso-syms.lds obj-$(VDSO64-y) += vdso-syms.lds # # Match symbols in the DSO that look like VDSO*; produce a file of constants. # sed-vdsosym := -e 's/^00*/0/' \ -e 's/^\([0-9a-fA-F]*\) . \(VDSO[a-zA-Z0-9_]*\)$$/\2 = 0x\1;/p' quiet_cmd_vdsosym = VDSOSYM $@ define cmd_vdsosym $(NM) $< | LC_ALL=C sed -n $(sed-vdsosym) | LC_ALL=C sort > $@ endef $(obj)/%-syms.lds: $(obj)/%.so.dbg FORCE $(call if_changed,vdsosym) # # Build multiple 32-bit vDSO images to choose from at boot time. # obj-$(VDSO32-y) += vdso32-syms.lds vdso32.so-$(VDSO32-y) += int80 vdso32.so-$(CONFIG_COMPAT) += syscall vdso32.so-$(VDSO32-y) += sysenter vdso32-images = $(vdso32.so-y:%=vdso32-%.so) CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds) VDSO_LDFLAGS_vdso32.lds = -m elf_i386 -Wl,-soname=linux-gate.so.1 # This makes sure the $(obj) subdirectory exists even though vdso32/ # is not a kbuild sub-make subdirectory. override obj-dirs = $(dir $(obj)) $(obj)/vdso32/ targets += vdso32/vdso32.lds targets += $(vdso32-images) $(vdso32-images:=.dbg) targets += vdso32/note.o $(vdso32.so-y:%=vdso32/%.o) extra-y += $(vdso32-images) $(obj)/vdso32.o: $(vdso32-images:%=$(obj)/%) KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) $(vdso32-images:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32) $(vdso32-images:%=$(obj)/%.dbg): asflags-$(CONFIG_X86_64) += -m32 $(vdso32-images:%=$(obj)/%.dbg): $(obj)/vdso32-%.so.dbg: FORCE \ $(obj)/vdso32/vdso32.lds \ $(obj)/vdso32/note.o \ $(obj)/vdso32/%.o $(call if_changed,vdso) # Make vdso32-*-syms.lds from each image, and then make sure they match. # The only difference should be that some do not define VDSO32_SYSENTER_RETURN. targets += vdso32-syms.lds $(vdso32.so-y:%=vdso32-%-syms.lds) quiet_cmd_vdso32sym = VDSOSYM $@ define cmd_vdso32sym if LC_ALL=C sort -u $(filter-out FORCE,$^) > $(@D)/.tmp_$(@F) && \ $(foreach H,$(filter-out FORCE,$^),\ if grep -q VDSO32_SYSENTER_RETURN $H; \ then diff -u $(@D)/.tmp_$(@F) $H; \ else sed /VDSO32_SYSENTER_RETURN/d $(@D)/.tmp_$(@F) | \ diff -u - $H; fi &&) : ;\ then mv -f $(@D)/.tmp_$(@F) $@; \ else rm -f $(@D)/.tmp_$(@F); exit 1; \ fi endef $(obj)/vdso32-syms.lds: $(vdso32.so-y:%=$(obj)/vdso32-%-syms.lds) FORCE $(call if_changed,vdso32sym) # # The DSO images are built using a special linker script. # quiet_cmd_vdso = VDSO $@ cmd_vdso = $(CC) -nostdlib -o $@ \ $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \ -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) GCOV_PROFILE := n # # Install the unstripped copy of vdso*.so listed in $(vdso-install-y). # quiet_cmd_vdso_install = INSTALL $@ cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ $(vdso-install-y): %.so: $(obj)/%.so.dbg FORCE @mkdir -p $(MODLIB)/vdso $(call cmd,vdso_install) PHONY += vdso_install $(vdso-install-y) vdso_install: $(vdso-install-y) clean-files := vdso32-syscall* vdso32-sysenter* vdso32-int80*