hostprogs-y := vdsomunge obj-vdso := vgettimeofday.o datapage.o # Build rules targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.so.raw vdso.lds obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) ccflags-y := -fPIC -fno-common -fno-builtin -fno-stack-protector ccflags-y += -DDISABLE_BRANCH_PROFILING VDSO_LDFLAGS := -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 VDSO_LDFLAGS += -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096 VDSO_LDFLAGS += -nostdlib -shared VDSO_LDFLAGS += $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) VDSO_LDFLAGS += $(call cc-ldoption, -Wl$(comma)--build-id) VDSO_LDFLAGS += $(call cc-option, -fuse-ld=bfd) obj-$(CONFIG_VDSO) += vdso.o extra-$(CONFIG_VDSO) += vdso.lds CPPFLAGS_vdso.lds += -P -C -U$(ARCH) CFLAGS_REMOVE_vdso.o = -pg # Force -O2 to avoid libgcc dependencies CFLAGS_REMOVE_vgettimeofday.o = -pg -Os CFLAGS_vgettimeofday.o = -O2 # Disable gcov profiling for VDSO code GCOV_PROFILE := n # Force dependency $(obj)/vdso.o : $(obj)/vdso.so # Link rule for the .so file $(obj)/vdso.so.raw: $(src)/vdso.lds $(obj-vdso) FORCE $(call if_changed,vdsold) $(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/vdsomunge FORCE $(call if_changed,vdsomunge) # Strip rule for the .so file $(obj)/%.so: OBJCOPYFLAGS := -S $(obj)/%.so: $(obj)/%.so.dbg FORCE $(call if_changed,objcopy) # Actual build commands quiet_cmd_vdsold = VDSO $@ cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \ -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@ quiet_cmd_vdsomunge = MUNGE $@ cmd_vdsomunge = $(objtree)/$(obj)/vdsomunge $< $@ # # Install the unstripped copy of vdso.so.dbg. If our toolchain # supports build-id, install .build-id links as well. # # Cribbed from arch/x86/vdso/Makefile. # quiet_cmd_vdso_install = INSTALL $< define cmd_vdso_install cp $< "$(MODLIB)/vdso/vdso.so"; \ if readelf -n $< | grep -q 'Build ID'; then \ buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \ first=`echo $$buildid | cut -b-2`; \ last=`echo $$buildid | cut -b3-`; \ mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \ ln -sf "../../vdso.so" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \ fi endef $(MODLIB)/vdso: FORCE @mkdir -p $(MODLIB)/vdso PHONY += vdso_install vdso_install: $(obj)/vdso.so.dbg $(MODLIB)/vdso FORCE $(call cmd,vdso_install)