200 lines
5.7 KiB
Makefile
200 lines
5.7 KiB
Makefile
#
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# Building vDSO images for x86.
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#
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VDSO64-$(CONFIG_X86_64) := y
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VDSOX32-$(CONFIG_X86_X32_ABI) := y
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VDSO32-$(CONFIG_X86_32) := y
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VDSO32-$(CONFIG_COMPAT) := y
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vdso-install-$(VDSO64-y) += vdso.so
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vdso-install-$(VDSOX32-y) += vdsox32.so
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vdso-install-$(VDSO32-y) += $(vdso32-images)
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# files to link into the vdso
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vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o
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vobjs-$(VDSOX32-y) += $(vobjx32s-compat)
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# Filter out x32 objects.
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vobj64s := $(filter-out $(vobjx32s-compat),$(vobjs-y))
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# files to link into kernel
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obj-$(VDSO64-y) += vma.o vdso.o
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obj-$(VDSOX32-y) += vdsox32.o
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obj-$(VDSO32-y) += vdso32.o vdso32-setup.o
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vobjs := $(foreach F,$(vobj64s),$(obj)/$F)
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$(obj)/vdso.o: $(obj)/vdso.so
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targets += vdso.so vdso.so.dbg vdso.lds $(vobjs-y)
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export CPPFLAGS_vdso.lds += -P -C
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VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \
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-Wl,--no-undefined \
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-Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096
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$(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so
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$(obj)/vdso.so.dbg: $(src)/vdso.lds $(vobjs) FORCE
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$(call if_changed,vdso)
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$(obj)/%.so: OBJCOPYFLAGS := -S
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$(obj)/%.so: $(obj)/%.so.dbg FORCE
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$(call if_changed,objcopy)
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#
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# Don't omit frame pointers for ease of userspace debugging, but do
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# optimize sibling calls.
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#
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CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \
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$(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \
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-fno-omit-frame-pointer -foptimize-sibling-calls
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$(vobjs): KBUILD_CFLAGS += $(CFL)
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#
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# vDSO code runs in userspace and -pg doesn't help with profiling anyway.
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#
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CFLAGS_REMOVE_vdso-note.o = -pg
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CFLAGS_REMOVE_vclock_gettime.o = -pg
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CFLAGS_REMOVE_vgetcpu.o = -pg
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CFLAGS_REMOVE_vvar.o = -pg
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targets += vdso-syms.lds
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obj-$(VDSO64-y) += vdso-syms.lds
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#
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# Match symbols in the DSO that look like VDSO*; produce a file of constants.
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#
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sed-vdsosym := -e 's/^00*/0/' \
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-e 's/^\([0-9a-fA-F]*\) . \(VDSO[a-zA-Z0-9_]*\)$$/\2 = 0x\1;/p'
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quiet_cmd_vdsosym = VDSOSYM $@
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define cmd_vdsosym
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$(NM) $< | LC_ALL=C sed -n $(sed-vdsosym) | LC_ALL=C sort > $@
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endef
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$(obj)/%-syms.lds: $(obj)/%.so.dbg FORCE
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$(call if_changed,vdsosym)
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#
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# X32 processes use x32 vDSO to access 64bit kernel data.
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#
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# Build x32 vDSO image:
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# 1. Compile x32 vDSO as 64bit.
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# 2. Convert object files to x32.
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# 3. Build x32 VDSO image with x32 objects, which contains 64bit codes
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# so that it can reach 64bit address space with 64bit pointers.
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#
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targets += vdsox32-syms.lds
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obj-$(VDSOX32-y) += vdsox32-syms.lds
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CPPFLAGS_vdsox32.lds = $(CPPFLAGS_vdso.lds)
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VDSO_LDFLAGS_vdsox32.lds = -Wl,-m,elf32_x86_64 \
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-Wl,-soname=linux-vdso.so.1 \
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-Wl,-z,max-page-size=4096 \
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-Wl,-z,common-page-size=4096
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vobjx32s-y := $(vobj64s:.o=-x32.o)
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vobjx32s := $(foreach F,$(vobjx32s-y),$(obj)/$F)
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# Convert 64bit object file to x32 for x32 vDSO.
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quiet_cmd_x32 = X32 $@
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cmd_x32 = $(OBJCOPY) -O elf32-x86-64 $< $@
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$(obj)/%-x32.o: $(obj)/%.o FORCE
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$(call if_changed,x32)
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targets += vdsox32.so vdsox32.so.dbg vdsox32.lds $(vobjx32s-y)
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$(obj)/vdsox32.o: $(src)/vdsox32.S $(obj)/vdsox32.so
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$(obj)/vdsox32.so.dbg: $(src)/vdsox32.lds $(vobjx32s) FORCE
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$(call if_changed,vdso)
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#
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# Build multiple 32-bit vDSO images to choose from at boot time.
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#
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obj-$(VDSO32-y) += vdso32-syms.lds
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vdso32.so-$(VDSO32-y) += int80
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vdso32.so-$(CONFIG_COMPAT) += syscall
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vdso32.so-$(VDSO32-y) += sysenter
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vdso32-images = $(vdso32.so-y:%=vdso32-%.so)
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CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds)
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VDSO_LDFLAGS_vdso32.lds = -m32 -Wl,-soname=linux-gate.so.1
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# This makes sure the $(obj) subdirectory exists even though vdso32/
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# is not a kbuild sub-make subdirectory.
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override obj-dirs = $(dir $(obj)) $(obj)/vdso32/
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targets += vdso32/vdso32.lds
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targets += $(vdso32-images) $(vdso32-images:=.dbg)
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targets += vdso32/note.o $(vdso32.so-y:%=vdso32/%.o)
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extra-y += $(vdso32-images)
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$(obj)/vdso32.o: $(vdso32-images:%=$(obj)/%)
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KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS))
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$(vdso32-images:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
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$(vdso32-images:%=$(obj)/%.dbg): asflags-$(CONFIG_X86_64) += -m32
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$(vdso32-images:%=$(obj)/%.dbg): $(obj)/vdso32-%.so.dbg: FORCE \
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$(obj)/vdso32/vdso32.lds \
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$(obj)/vdso32/note.o \
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$(obj)/vdso32/%.o
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$(call if_changed,vdso)
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# Make vdso32-*-syms.lds from each image, and then make sure they match.
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# The only difference should be that some do not define VDSO32_SYSENTER_RETURN.
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targets += vdso32-syms.lds $(vdso32.so-y:%=vdso32-%-syms.lds)
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quiet_cmd_vdso32sym = VDSOSYM $@
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define cmd_vdso32sym
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if LC_ALL=C sort -u $(filter-out FORCE,$^) > $(@D)/.tmp_$(@F) && \
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$(foreach H,$(filter-out FORCE,$^),\
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if grep -q VDSO32_SYSENTER_RETURN $H; \
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then diff -u $(@D)/.tmp_$(@F) $H; \
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else sed /VDSO32_SYSENTER_RETURN/d $(@D)/.tmp_$(@F) | \
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diff -u - $H; fi &&) : ;\
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then mv -f $(@D)/.tmp_$(@F) $@; \
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else rm -f $(@D)/.tmp_$(@F); exit 1; \
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fi
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endef
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$(obj)/vdso32-syms.lds: $(vdso32.so-y:%=$(obj)/vdso32-%-syms.lds) FORCE
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$(call if_changed,vdso32sym)
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#
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# The DSO images are built using a special linker script.
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#
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quiet_cmd_vdso = VDSO $@
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cmd_vdso = $(CC) -nostdlib -o $@ \
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$(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
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-Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \
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sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@'
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VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
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GCOV_PROFILE := n
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#
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# Install the unstripped copy of vdso*.so listed in $(vdso-install-y).
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#
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quiet_cmd_vdso_install = INSTALL $@
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cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
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$(vdso-install-y): %.so: $(obj)/%.so.dbg FORCE
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@mkdir -p $(MODLIB)/vdso
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$(call cmd,vdso_install)
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PHONY += vdso_install $(vdso-install-y)
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vdso_install: $(vdso-install-y)
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clean-files := vdso32-syscall* vdso32-sysenter* vdso32-int80*
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