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 and ubsan for VDSO code
32 # Force dependency (incbin is bad)
33 $(obj
)/vdso32_wrapper.o
: $(obj
)/vdso32.so
35 # link rule for the .so file, .lds has to be first
36 $(obj
)/vdso32.so.dbg
: $(src
)/vdso32.lds
$(obj-vdso32
)
37 $(call if_changed
,vdso32ld
)
39 # strip rule for the .so file
40 $(obj
)/%.so
: OBJCOPYFLAGS
:= -S
41 $(obj
)/%.so
: $(obj
)/%.so.dbg FORCE
42 $(call if_changed
,objcopy
)
44 # assembly rules for the .S files
45 $(obj-vdso32
): %.o
: %.S
46 $(call if_changed_dep
,vdso32as
)
48 # actual build commands
49 quiet_cmd_vdso32ld
= VDSO32L
$@
50 cmd_vdso32ld
= $(CC
) $(c_flags
) -Wl
,-T
$^
-o
$@
51 quiet_cmd_vdso32as
= VDSO32A
$@
52 cmd_vdso32as
= $(CC
) $(a_flags
) -c
-o
$@
$<
54 # install commands for the unstripped file
55 quiet_cmd_vdso_install
= INSTALL
$@
56 cmd_vdso_install
= cp
$(obj
)/$@.dbg
$(MODLIB
)/vdso
/$@
58 vdso32.so
: $(obj
)/vdso32.so.dbg
59 @mkdir
-p
$(MODLIB
)/vdso
60 $(call cmd
,vdso_install
)
62 vdso_install
: vdso32.so