1 # SPDX-License-Identifier: GPL-2.0
2 # List of files in the vdso, has to be asm only for now
6 obj-vdso64 = gettimeofday.o clock_getres.o clock_gettime.o note.o getcpu.o
10 targets := $(obj-vdso64) vdso64.so vdso64.so.dbg
11 obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64))
13 KBUILD_AFLAGS += -DBUILD_VDSO
14 KBUILD_CFLAGS += -DBUILD_VDSO
16 KBUILD_AFLAGS_64 := $(filter-out -m64,$(KBUILD_AFLAGS))
17 KBUILD_AFLAGS_64 += -m64 -s
19 KBUILD_CFLAGS_64 := $(filter-out -m64,$(KBUILD_CFLAGS))
20 KBUILD_CFLAGS_64 += -m64 -fPIC -shared -fno-common -fno-builtin
21 ldflags-y := -fPIC -shared -nostdlib -soname=linux-vdso64.so.1 \
22 --hash-style=both --build-id -T
24 $(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_64)
25 $(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_64)
27 obj-y += vdso64_wrapper.o
29 CPPFLAGS_vdso64.lds += -P -C -U$(ARCH)
31 # Disable gcov profiling, ubsan and kasan for VDSO code
36 # Force dependency (incbin is bad)
37 $(obj)/vdso64_wrapper.o : $(obj)/vdso64.so
39 # link rule for the .so file, .lds has to be first
40 $(obj)/vdso64.so.dbg: $(obj)/vdso64.lds $(obj-vdso64) FORCE
43 # strip rule for the .so file
44 $(obj)/%.so: OBJCOPYFLAGS := -S
45 $(obj)/%.so: $(obj)/%.so.dbg FORCE
46 $(call if_changed,objcopy)
48 # assembly rules for the .S files
49 $(obj-vdso64): %.o: %.S FORCE
50 $(call if_changed_dep,vdso64as)
52 # actual build commands
53 quiet_cmd_vdso64as = VDSO64A $@
54 cmd_vdso64as = $(CC) $(a_flags) -c -o $@ $<
56 # install commands for the unstripped file
57 quiet_cmd_vdso_install = INSTALL $@
58 cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
60 vdso64.so: $(obj)/vdso64.so.dbg
61 @mkdir -p $(MODLIB)/vdso
62 $(call cmd,vdso_install)
64 vdso_install: vdso64.so