| # | |
| # Building a vDSO image for AArch64. | |
| # | |
| # Author: Will Deacon <will.deacon@arm.com> | |
| # Heavily based on the vDSO Makefiles for other archs. | |
| # | |
| obj-vdso := gettimeofday.o note.o sigreturn.o | |
| # Build rules | |
| targets := $(obj-vdso) vdso.so vdso.so.dbg | |
| obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) | |
| ccflags-y := -shared -fno-common -fno-builtin | |
| ccflags-y += -nostdlib -Wl,-soname=linux-vdso.so.1 \ | |
| $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) | |
| obj-y += vdso.o | |
| extra-y += vdso.lds vdso-offsets.h | |
| CPPFLAGS_vdso.lds += -P -C -U$(ARCH) | |
| # Force dependency (incbin is bad) | |
| $(obj)/vdso.o : $(obj)/vdso.so | |
| # Link rule for the .so file, .lds has to be first | |
| $(obj)/vdso.so.dbg: $(src)/vdso.lds $(obj-vdso) | |
| $(call if_changed,vdsold) | |
| # Strip rule for the .so file | |
| $(obj)/%.so: OBJCOPYFLAGS := -S | |
| $(obj)/%.so: $(obj)/%.so.dbg FORCE | |
| $(call if_changed,objcopy) | |
| # Generate VDSO offsets using helper script | |
| gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh | |
| quiet_cmd_vdsosym = VDSOSYM $@ | |
| define cmd_vdsosym | |
| $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ && \ | |
| cp $@ include/generated/ | |
| endef | |
| $(obj)/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE | |
| $(call if_changed,vdsosym) | |
| # Assembly rules for the .S files | |
| $(obj-vdso): %.o: %.S | |
| $(call if_changed_dep,vdsoas) | |
| # Actual build commands | |
| quiet_cmd_vdsold = VDSOL $@ | |
| cmd_vdsold = $(CC) $(c_flags) -Wl,-n -Wl,-T $^ -o $@ | |
| quiet_cmd_vdsoas = VDSOA $@ | |
| cmd_vdsoas = $(CC) $(a_flags) -c -o $@ $< | |
| # Install commands for the unstripped file | |
| quiet_cmd_vdso_install = INSTALL $@ | |
| cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ | |
| vdso.so: $(obj)/vdso.so.dbg | |
| @mkdir -p $(MODLIB)/vdso | |
| $(call cmd,vdso_install) | |
| vdso_install: vdso.so |