1# List of files in the vdso, has to be asm only for now 2 3obj-vdso64 = note.o sigtramp.o restart_syscall.o 4 5# Build rules 6 7targets := $(obj-vdso64) vdso64.so 8obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64)) 9 10 11ccflags-y := -shared -fno-common -fno-builtin 12ccflags-y += -nostdlib -Wl,-soname=linux-vdso64.so.1 \ 13 $(call ld-option, -Wl$(comma)--hash-style=sysv) 14asflags-y := -D__VDSO64__ -s 15 16KBUILD_AFLAGS += -DBUILD_VDSO 17KBUILD_CFLAGS += -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING 18 19VDSO_LIBGCC := $(shell $(CC) -print-libgcc-file-name) 20 21obj-y += vdso64_wrapper.o 22extra-y += vdso64.lds 23CPPFLAGS_vdso64.lds += -P -C -U$(ARCH) 24 25$(obj)/vdso64_wrapper.o : $(obj)/vdso64.so FORCE 26 27# Force dependency (incbin is bad) 28# link rule for the .so file, .lds has to be first 29$(obj)/vdso64.so: $(src)/vdso64.lds $(obj-vdso64) $(VDSO_LIBGCC) FORCE 30 $(call if_changed,vdso64ld) 31 32# assembly rules for the .S files 33$(obj-vdso64): %.o: %.S FORCE 34 $(call if_changed_dep,vdso64as) 35 36# actual build commands 37quiet_cmd_vdso64ld = VDSO64L $@ 38 cmd_vdso64ld = $(CC) $(c_flags) -Wl,-T $(filter-out FORCE, $^) -o $@ 39quiet_cmd_vdso64as = VDSO64A $@ 40 cmd_vdso64as = $(CC) $(a_flags) -c -o $@ $< 41 42# Generate VDSO offsets using helper script 43gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh 44quiet_cmd_vdsosym = VDSOSYM $@ 45 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ 46 47include/generated/vdso64-offsets.h: $(obj)/vdso64.so FORCE 48 $(call if_changed,vdsosym) 49