15c48b108SAl Viro# 25c48b108SAl Viro# Building vDSO images for x86. 35c48b108SAl Viro# 45c48b108SAl Viro 5*915eed20SVegard Nossum# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in. 6*915eed20SVegard NossumKCOV_INSTRUMENT := n 7*915eed20SVegard Nossum 85c48b108SAl ViroVDSO64-y := y 95c48b108SAl Viro 105c48b108SAl Virovdso-install-$(VDSO64-y) += vdso.so 115c48b108SAl Viro 125c48b108SAl Viro 135c48b108SAl Viro# files to link into the vdso 145c48b108SAl Virovobjs-y := vdso-note.o um_vdso.o 155c48b108SAl Viro 165c48b108SAl Viro# files to link into kernel 175c48b108SAl Viroobj-$(VDSO64-y) += vdso.o vma.o 185c48b108SAl Viro 195c48b108SAl Virovobjs := $(foreach F,$(vobjs-y),$(obj)/$F) 205c48b108SAl Viro 215c48b108SAl Viro$(obj)/vdso.o: $(obj)/vdso.so 225c48b108SAl Viro 235c48b108SAl Virotargets += vdso.so vdso.so.dbg vdso.lds $(vobjs-y) 245c48b108SAl Viro 255c48b108SAl Viroexport CPPFLAGS_vdso.lds += -P -C 265c48b108SAl Viro 275c48b108SAl ViroVDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \ 285c48b108SAl Viro -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096 295c48b108SAl Viro 305c48b108SAl Viro$(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so 315c48b108SAl Viro 325c48b108SAl Viro$(obj)/vdso.so.dbg: $(src)/vdso.lds $(vobjs) FORCE 335c48b108SAl Viro $(call if_changed,vdso) 345c48b108SAl Viro 355c48b108SAl Viro$(obj)/%.so: OBJCOPYFLAGS := -S 365c48b108SAl Viro$(obj)/%.so: $(obj)/%.so.dbg FORCE 375c48b108SAl Viro $(call if_changed,objcopy) 385c48b108SAl Viro 395c48b108SAl Viro# 405c48b108SAl Viro# Don't omit frame pointers for ease of userspace debugging, but do 415c48b108SAl Viro# optimize sibling calls. 425c48b108SAl Viro# 435c48b108SAl ViroCFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \ 445c48b108SAl Viro $(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \ 455c48b108SAl Viro -fno-omit-frame-pointer -foptimize-sibling-calls 465c48b108SAl Viro 475c48b108SAl Viro$(vobjs): KBUILD_CFLAGS += $(CFL) 485c48b108SAl Viro 495c48b108SAl Viro# 505c48b108SAl Viro# vDSO code runs in userspace and -pg doesn't help with profiling anyway. 515c48b108SAl Viro# 524d211093SAl ViroCFLAGS_REMOVE_vdso-note.o = -pg -fprofile-arcs -ftest-coverage 534d211093SAl ViroCFLAGS_REMOVE_um_vdso.o = -pg -fprofile-arcs -ftest-coverage 545c48b108SAl Viro 555c48b108SAl Virotargets += vdso-syms.lds 565c48b108SAl Viroobj-$(VDSO64-y) += vdso-syms.lds 575c48b108SAl Viro 585c48b108SAl Viro# 595c48b108SAl Viro# Match symbols in the DSO that look like VDSO*; produce a file of constants. 605c48b108SAl Viro# 615c48b108SAl Virosed-vdsosym := -e 's/^00*/0/' \ 625c48b108SAl Viro -e 's/^\([0-9a-fA-F]*\) . \(VDSO[a-zA-Z0-9_]*\)$$/\2 = 0x\1;/p' 635c48b108SAl Viroquiet_cmd_vdsosym = VDSOSYM $@ 645c48b108SAl Virodefine cmd_vdsosym 655c48b108SAl Viro $(NM) $< | LC_ALL=C sed -n $(sed-vdsosym) | LC_ALL=C sort > $@ 665c48b108SAl Viroendef 675c48b108SAl Viro 685c48b108SAl Viro$(obj)/%-syms.lds: $(obj)/%.so.dbg FORCE 695c48b108SAl Viro $(call if_changed,vdsosym) 705c48b108SAl Viro 715c48b108SAl Viro# 725c48b108SAl Viro# The DSO images are built using a special linker script. 735c48b108SAl Viro# 745c48b108SAl Viroquiet_cmd_vdso = VDSO $@ 755c48b108SAl Viro cmd_vdso = $(CC) -nostdlib -o $@ \ 765c48b108SAl Viro $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \ 775c48b108SAl Viro -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \ 785c48b108SAl Viro sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@' 795c48b108SAl Viro 805c48b108SAl ViroVDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) 815c48b108SAl ViroGCOV_PROFILE := n 825c48b108SAl Viro 835c48b108SAl Viro# 845c48b108SAl Viro# Install the unstripped copy of vdso*.so listed in $(vdso-install-y). 855c48b108SAl Viro# 865c48b108SAl Viroquiet_cmd_vdso_install = INSTALL $@ 875c48b108SAl Viro cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ 885c48b108SAl Viro$(vdso-install-y): %.so: $(obj)/%.so.dbg FORCE 895c48b108SAl Viro @mkdir -p $(MODLIB)/vdso 905c48b108SAl Viro $(call cmd,vdso_install) 915c48b108SAl Viro 925c48b108SAl ViroPHONY += vdso_install $(vdso-install-y) 935c48b108SAl Virovdso_install: $(vdso-install-y) 94