1# 2# Building a vDSO image for AArch64. 3# 4# Author: Will Deacon <will.deacon@arm.com> 5# Heavily based on the vDSO Makefiles for other archs. 6# 7 8obj-vdso := gettimeofday.o note.o sigreturn.o 9 10# Build rules 11targets := $(obj-vdso) vdso.so vdso.so.dbg 12obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) 13 14ccflags-y := -shared -fno-common -fno-builtin 15ccflags-y += -nostdlib -Wl,-soname=linux-vdso.so.1 \ 16 $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) 17 18obj-y += vdso.o 19extra-y += vdso.lds vdso-offsets.h 20CPPFLAGS_vdso.lds += -P -C -U$(ARCH) 21 22# Force dependency (incbin is bad) 23$(obj)/vdso.o : $(obj)/vdso.so 24 25# Link rule for the .so file, .lds has to be first 26$(obj)/vdso.so.dbg: $(src)/vdso.lds $(obj-vdso) 27 $(call if_changed,vdsold) 28 29# Strip rule for the .so file 30$(obj)/%.so: OBJCOPYFLAGS := -S 31$(obj)/%.so: $(obj)/%.so.dbg FORCE 32 $(call if_changed,objcopy) 33 34# Generate VDSO offsets using helper script 35gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh 36quiet_cmd_vdsosym = VDSOSYM $@ 37define cmd_vdsosym 38 $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ && \ 39 cp $@ include/generated/ 40endef 41 42$(obj)/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE 43 $(call if_changed,vdsosym) 44 45# Assembly rules for the .S files 46$(obj-vdso): %.o: %.S FORCE 47 $(call if_changed_dep,vdsoas) 48 49# Actual build commands 50quiet_cmd_vdsold = VDSOL $@ 51 cmd_vdsold = $(CC) $(c_flags) -Wl,-n -Wl,-T $^ -o $@ 52quiet_cmd_vdsoas = VDSOA $@ 53 cmd_vdsoas = $(CC) $(a_flags) -c -o $@ $< 54 55# Install commands for the unstripped file 56quiet_cmd_vdso_install = INSTALL $@ 57 cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ 58 59vdso.so: $(obj)/vdso.so.dbg 60 @mkdir -p $(MODLIB)/vdso 61 $(call cmd,vdso_install) 62 63vdso_install: vdso.so 64