diff options
Diffstat (limited to 'arch/x86/vdso/Makefile')
| -rw-r--r-- | arch/x86/vdso/Makefile | 132 |
1 files changed, 101 insertions, 31 deletions
diff --git a/arch/x86/vdso/Makefile b/arch/x86/vdso/Makefile index e7bff0fbac23..d28dda574700 100644 --- a/arch/x86/vdso/Makefile +++ b/arch/x86/vdso/Makefile @@ -1,39 +1,37 @@ # -# x86-64 vDSO. +# 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) += $(vdso32-y:=.so) + + # files to link into the vdso -# vdso-start.o has to be first -vobjs-y := vdso-start.o vdso-note.o vclock_gettime.o vgetcpu.o vvar.o +vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o vvar.o # files to link into kernel -obj-y := vma.o vdso.o vdso-syms.o +obj-$(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) vdso-syms.o - -# The DSO images are built using a special linker script. -quiet_cmd_syscall = SYSCALL $@ - cmd_syscall = $(CC) -m elf_x86_64 -nostdlib $(SYSCFLAGS_$(@F)) \ - -Wl,-T,$(filter-out FORCE,$^) -o $@ +targets += vdso.so vdso.so.dbg vdso.lds $(vobjs-y) export CPPFLAGS_vdso.lds += -P -C -vdso-flags = -fPIC -shared -Wl,-soname=linux-vdso.so.1 \ - $(call ld-option, -Wl$(comma)--hash-style=sysv) \ - -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096 -SYSCFLAGS_vdso.so = $(vdso-flags) -SYSCFLAGS_vdso.so.dbg = $(vdso-flags) +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: $(src)/vdso.lds $(vobjs) FORCE - $(obj)/vdso.so.dbg: $(src)/vdso.lds $(vobjs) FORCE - $(call if_changed,syscall) + $(call if_changed,vdso) $(obj)/%.so: OBJCOPYFLAGS := -S $(obj)/%.so: $(obj)/%.so.dbg FORCE @@ -41,24 +39,96 @@ $(obj)/%.so: $(obj)/%.so.dbg FORCE CFL := $(PROFILING) -mcmodel=small -fPIC -g0 -O2 -fasynchronous-unwind-tables -m64 -$(obj)/vclock_gettime.o: KBUILD_CFLAGS = $(CFL) -$(obj)/vgetcpu.o: KBUILD_CFLAGS = $(CFL) +$(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 $@ + cmd_vdsosym = $(NM) $< | sed -n $(sed-vdsosym) | LC_ALL=C sort > $@ + +$(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-$(CONFIG_X86_32) += int80 +vdso32.so-$(CONFIG_COMPAT) += syscall +vdso32.so-$(VDSO32-y) += sysenter + +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)) $(obj)/vdso32/ -# We also create a special relocatable object that should mirror the symbol -# table and layout of the linked DSO. With ld -R we can then refer to -# these symbols in the kernel code rather than hand-coded addresses. -extra-y += vdso-syms.o -$(obj)/built-in.o: $(obj)/vdso-syms.o -$(obj)/built-in.o: ld_flags += -R $(obj)/vdso-syms.o +targets += vdso32/vdso32.lds +targets += $(vdso32.so-y:%=vdso32-%.so.dbg) $(vdso32.so-y:%=vdso32-%.so) +targets += vdso32/note.o $(vdso32.so-y:%=vdso32/%.o) -SYSCFLAGS_vdso-syms.o = -r -d -$(obj)/vdso-syms.o: $(src)/vdso.lds $(vobjs) FORCE - $(call if_changed,syscall) +extra-y += $(vdso32.so-y:%=vdso32-%.so) +$(obj)/vdso32.o: $(vdso32.so-y:%=$(obj)/vdso32-%.so) + +KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) +$(vdso32.so-y:%=$(obj)/vdso32-%.so.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32) +$(vdso32.so-y:%=$(obj)/vdso32-%.so.dbg): asflags-$(CONFIG_X86_64) += -m32 + +$(vdso32.so-y:%=$(obj)/vdso32-%.so.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 $(call ld-option, -Wl$(comma)--hash-style=sysv) + +# +# 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.so: +$(vdso-install-y): %.so: $(obj)/%.so.dbg FORCE @mkdir -p $(MODLIB)/vdso $(call cmd,vdso_install) -vdso_install: vdso.so +PHONY += vdso_install $(vdso-install-y) +vdso_install: $(vdso-install-y) + +clean-files := vdso32-syscall* vdso32-sysenter* vdso32-int80* |