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 += -DBUILD_VDSO
14 KBUILD_CFLAGS += -DBUILD_VDSO
16 KBUILD_AFLAGS_31 := $(filter-out -m64,$(KBUILD_AFLAGS))
17 KBUILD_AFLAGS_31 += -m31 -s
19 KBUILD_CFLAGS_31 := $(filter-out -m64,$(KBUILD_CFLAGS))
20 KBUILD_CFLAGS_31 += -m31 -fPIC -shared -fno-common -fno-builtin
21 KBUILD_CFLAGS_31 += -nostdlib -Wl,-soname=linux-vdso32.so.1 \
22 $(call cc-ldoption, -Wl$(comma)--hash-style=both)
24 $(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_31)
25 $(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_31)
27 obj-y += vdso32_wrapper.o
29 CPPFLAGS_vdso32.lds += -P -C -U$(ARCH)
31 # Disable gcov profiling, ubsan and kasan for VDSO code
36 # Force dependency (incbin is bad)
37 $(obj)/vdso32_wrapper.o : $(obj)/vdso32.so
39 # link rule for the .so file, .lds has to be first
40 $(obj)/vdso32.so.dbg: $(src)/vdso32.lds $(obj-vdso32) FORCE
41 $(call if_changed,vdso32ld)
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-vdso32): %.o: %.S FORCE
50 $(call if_changed_dep,vdso32as)
52 # actual build commands
53 quiet_cmd_vdso32ld = VDSO32L $@
54 cmd_vdso32ld = $(CC) $(c_flags) -Wl,-T $(filter %.lds %.o,$^) -o $@
55 quiet_cmd_vdso32as = VDSO32A $@
56 cmd_vdso32as = $(CC) $(a_flags) -c -o $@ $<
58 # install commands for the unstripped file
59 quiet_cmd_vdso_install = INSTALL $@
60 cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
62 vdso32.so: $(obj)/vdso32.so.dbg
63 @mkdir -p $(MODLIB)/vdso
64 $(call cmd,vdso_install)
66 vdso_install: vdso32.so