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# SPDX-License-Identifier: GPL-2.0 # Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before # the inclusion of generic Makefile. ARCH_REL_TYPE_ABS := R_ARM_JUMP_SLOT|R_ARM_GLOB_DAT|R_ARM_ABS32 include $(srctree)/lib/vdso/Makefile hostprogs := vdsomunge obj-vdso := vgettimeofday.o datapage.o note.o # Build rules targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.so.raw vdso.lds obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) ccflags-y := -fPIC -fno-common -fno-builtin -fno-stack-protector ccflags-y += -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO32 ldflags-$(CONFIG_CPU_ENDIAN_BE8) := --be8 ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \ -z max-page-size=4096 -nostdlib -shared $(ldflags-y) \ --hash-style=sysv --build-id=sha1 \ -T obj-$(CONFIG_VDSO) += vdso.o CPPFLAGS_vdso.lds += -P -C -U$(ARCH) CFLAGS_REMOVE_vdso.o = -pg # Force -O2 to avoid libgcc dependencies CFLAGS_REMOVE_vgettimeofday.o = -pg -Os $(GCC_PLUGINS_CFLAGS) ifeq ($(c-gettimeofday-y),) CFLAGS_vgettimeofday.o = -O2 else CFLAGS_vgettimeofday.o = -O2 -include $(c-gettimeofday-y) endif # Disable gcov profiling for VDSO code GCOV_PROFILE := n # Prevents link failures: __sanitizer_cov_trace_pc() is not linked in. KCOV_INSTRUMENT := n KASAN_SANITIZE := n # Force dependency $(obj)/vdso.o : $(obj)/vdso.so # Link rule for the .so file $(obj)/vdso.so.raw: $(obj)/vdso.lds $(obj-vdso) FORCE $(call if_changed,vdsold_and_vdso_check) $(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_and_vdso_check = LD $@ cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check) 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 $(call cmd,vdso_install)