1 # SPDX-License-Identifier: GPL-2.0
2 # List of files in the vdso, has to be asm only for now
6 obj-vdso32 = gettimeofday.o clock_getres.o clock_gettime.o note.o getcpu.o
10 targets := $(obj-vdso32) vdso32.so vdso32.so.dbg
11 obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32))
13 KBUILD_AFLAGS_31 := $(filter-out -m64,$(KBUILD_AFLAGS))
14 KBUILD_AFLAGS_31 += -m31 -s
16 KBUILD_CFLAGS_31 := $(filter-out -m64,$(KBUILD_CFLAGS))
17 KBUILD_CFLAGS_31 += -m31 -fPIC -shared -fno-common -fno-builtin
18 KBUILD_CFLAGS_31 += -nostdlib -Wl,-soname=linux-vdso32.so.1 \
19 $(call cc-ldoption, -Wl$(comma)--hash-style=both)
21 $(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_31)
22 $(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_31)
24 obj-y += vdso32_wrapper.o
26 CPPFLAGS_vdso32.lds += -P -C -U$(ARCH)
28 # Disable gcov profiling, ubsan and kasan for VDSO code
33 # Force dependency (incbin is bad)
34 $(obj)/vdso32_wrapper.o : $(obj)/vdso32.so
36 # link rule for the .so file, .lds has to be first
37 $(obj)/vdso32.so.dbg: $(src)/vdso32.lds $(obj-vdso32) FORCE
38 $(call if_changed,vdso32ld)
40 # strip rule for the .so file
41 $(obj)/%.so: OBJCOPYFLAGS := -S
42 $(obj)/%.so: $(obj)/%.so.dbg FORCE
43 $(call if_changed,objcopy)
45 # assembly rules for the .S files
46 $(obj-vdso32): %.o: %.S FORCE
47 $(call if_changed_dep,vdso32as)
49 # actual build commands
50 quiet_cmd_vdso32ld = VDSO32L $@
51 cmd_vdso32ld = $(CC) $(c_flags) -Wl,-T $(filter %.lds %.o,$^) -o $@
52 quiet_cmd_vdso32as = VDSO32A $@
53 cmd_vdso32as = $(CC) $(a_flags) -c -o $@ $<
55 # install commands for the unstripped file
56 quiet_cmd_vdso_install = INSTALL $@
57 cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
59 vdso32.so: $(obj)/vdso32.so.dbg
60 @mkdir -p $(MODLIB)/vdso
61 $(call cmd,vdso_install)
63 vdso_install: vdso32.so