1# SPDX-License-Identifier: GPL-2.0 2 3# Include the generic Makefile to check the built vdso. 4include $(srctree)/lib/vdso/Makefile 5 6hostprogs := vdsomunge 7 8obj-vdso := vgettimeofday.o note.o 9 10# Build rules 11targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.so.raw vdso.lds 12obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) 13 14ccflags-y := -fPIC -fno-common -fno-builtin -fno-stack-protector 15ccflags-y += -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO32 16 17ldflags-$(CONFIG_CPU_ENDIAN_BE8) := --be8 18ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \ 19 -z max-page-size=4096 -shared $(ldflags-y) \ 20 --hash-style=sysv --build-id=sha1 \ 21 -T 22 23obj-$(CONFIG_VDSO) += vdso.o 24CPPFLAGS_vdso.lds += -P -C -U$(ARCH) 25 26CFLAGS_REMOVE_vdso.o = -pg 27 28# Force -O2 to avoid libgcc dependencies 29CFLAGS_REMOVE_vgettimeofday.o = -pg -Os $(RANDSTRUCT_CFLAGS) $(GCC_PLUGINS_CFLAGS) 30ifeq ($(c-gettimeofday-y),) 31CFLAGS_vgettimeofday.o = -O2 32else 33CFLAGS_vgettimeofday.o = -O2 -include $(c-gettimeofday-y) 34endif 35 36# Force dependency 37$(obj)/vdso.o : $(obj)/vdso.so 38 39# Link rule for the .so file 40$(obj)/vdso.so.raw: $(obj)/vdso.lds $(obj-vdso) FORCE 41 $(call if_changed,vdsold_and_vdso_check) 42 43$(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/vdsomunge FORCE 44 $(call if_changed,vdsomunge) 45 46# Strip rule for the .so file 47$(obj)/%.so: OBJCOPYFLAGS := -S 48$(obj)/%.so: $(obj)/%.so.dbg FORCE 49 $(call if_changed,objcopy) 50 51# Actual build commands 52quiet_cmd_vdsold_and_vdso_check = LD $@ 53 cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check) 54 55quiet_cmd_vdsomunge = MUNGE $@ 56 cmd_vdsomunge = $(objtree)/$(obj)/vdsomunge $< $@ 57