| # |
| # Building vDSO images for x86. |
| # |
| |
| VDSO64-$(CONFIG_X86_64) := y |
| VDSOX32-$(CONFIG_X86_X32_ABI) := y |
| VDSO32-$(CONFIG_X86_32) := y |
| VDSO32-$(CONFIG_COMPAT) := y |
| |
| vdso-install-$(VDSO64-y) += vdso.so |
| vdso-install-$(VDSOX32-y) += vdsox32.so |
| vdso-install-$(VDSO32-y) += $(vdso32-images) |
| |
| |
| # files to link into the vdso |
| vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o |
| |
| vobjs-$(VDSOX32-y) += $(vobjx32s-compat) |
| |
| # Filter out x32 objects. |
| vobj64s := $(filter-out $(vobjx32s-compat),$(vobjs-y)) |
| |
| # files to link into kernel |
| obj-y += vma.o |
| obj-$(VDSO64-y) += vdso.o |
| obj-$(VDSOX32-y) += vdsox32.o |
| obj-$(VDSO32-y) += vdso32.o vdso32-setup.o |
| |
| vobjs := $(foreach F,$(vobj64s),$(obj)/$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 = -m64 -Wl,-soname=linux-vdso.so.1 \ |
| -Wl,--no-undefined \ |
| -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) |
| |
| # |
| # Don't omit frame pointers for ease of userspace debugging, but do |
| # optimize sibling calls. |
| # |
| CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \ |
| $(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \ |
| -fno-omit-frame-pointer -foptimize-sibling-calls |
| |
| $(vobjs): KBUILD_CFLAGS += $(CFL) |
| |
| # |
| # vDSO code runs in userspace and -pg doesn't help with profiling anyway. |
| # |
| CFLAGS_REMOVE_vdso-note.o = -pg |
| CFLAGS_REMOVE_vclock_gettime.o = -pg |
| CFLAGS_REMOVE_vgetcpu.o = -pg |
| CFLAGS_REMOVE_vvar.o = -pg |
| |
| targets += vdso-syms.lds |
| obj-$(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 |
| $(call if_changed,vdsosym) |
| |
| # |
| # X32 processes use x32 vDSO to access 64bit kernel data. |
| # |
| # Build x32 vDSO image: |
| # 1. Compile x32 vDSO as 64bit. |
| # 2. Convert object files to x32. |
| # 3. Build x32 VDSO image with x32 objects, which contains 64bit codes |
| # so that it can reach 64bit address space with 64bit pointers. |
| # |
| |
| targets += vdsox32-syms.lds |
| obj-$(VDSOX32-y) += vdsox32-syms.lds |
| |
| CPPFLAGS_vdsox32.lds = $(CPPFLAGS_vdso.lds) |
| VDSO_LDFLAGS_vdsox32.lds = -Wl,-m,elf32_x86_64 \ |
| -Wl,-soname=linux-vdso.so.1 \ |
| -Wl,-z,max-page-size=4096 \ |
| -Wl,-z,common-page-size=4096 |
| |
| vobjx32s-y := $(vobj64s:.o=-x32.o) |
| vobjx32s := $(foreach F,$(vobjx32s-y),$(obj)/$F) |
| |
| # Convert 64bit object file to x32 for x32 vDSO. |
| quiet_cmd_x32 = X32 $@ |
| cmd_x32 = $(OBJCOPY) -O elf32-x86-64 $< $@ |
| |
| $(obj)/%-x32.o: $(obj)/%.o FORCE |
| $(call if_changed,x32) |
| |
| targets += vdsox32.so vdsox32.so.dbg vdsox32.lds $(vobjx32s-y) |
| |
| $(obj)/vdsox32.o: $(src)/vdsox32.S $(obj)/vdsox32.so |
| |
| $(obj)/vdsox32.so.dbg: $(src)/vdsox32.lds $(vobjx32s) FORCE |
| $(call if_changed,vdso) |
| |
| # |
| # Build multiple 32-bit vDSO images to choose from at boot time. |
| # |
| obj-$(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 = -m32 -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/vclock_gettime.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 |
| |
| KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS)) |
| KBUILD_CFLAGS_32 := $(filter-out -mcmodel=kernel,$(KBUILD_CFLAGS_32)) |
| KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32)) |
| KBUILD_CFLAGS_32 := $(filter-out -mfentry,$(KBUILD_CFLAGS_32)) |
| KBUILD_CFLAGS_32 += -m32 -msoft-float -mregparm=0 -fpic |
| KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector) |
| KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls) |
| KBUILD_CFLAGS_32 += -fno-omit-frame-pointer |
| $(vdso32-images:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_32) |
| |
| $(vdso32-images:%=$(obj)/%.dbg): $(obj)/vdso32-%.so.dbg: FORCE \ |
| $(obj)/vdso32/vdso32.lds \ |
| $(obj)/vdso32/vclock_gettime.o \ |
| $(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,$^) $(filter %.o,$^) && \ |
| sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@' |
| |
| 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* |