1 # SPDX-License-Identifier: GPL-2.0-only
2
3 # Include the generic Makefile to check the bu
4 include $(srctree)/lib/vdso/Makefile
5
6 # Symbols present in the vdso
7 vdso-syms += rt_sigreturn
8 vdso-syms += vgettimeofday
9
10 # Files to link into the vdso
11 obj-vdso = $(patsubst %, %.o, $(vdso-syms)) no
12
13 ifneq ($(c-gettimeofday-y),)
14 CFLAGS_vgettimeofday.o += -include $(c
15 endif
16
17 ccflags-y := -fno-stack-protector -DBUILD_VDSO
18
19 # Build rules
20 targets := $(obj-vdso) vdso.so vdso.so.dbg vds
21 obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
22
23 obj-y += vdso.o vdso-syms.o
24 CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
25
26 # Force dependency
27 $(obj)/vdso.o: $(obj)/vdso.so
28
29 SYSCFLAGS_vdso.so.dbg = $(c_flags)
30 $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso
31 $(call if_changed,vdsold)
32 SYSCFLAGS_vdso.so.dbg = -shared -s -Wl,-soname
33 -Wl,--build-id=sha1 -Wl,--hash-style=b
34
35 $(obj)/vdso-syms.S: $(obj)/vdso.so FORCE
36 $(call if_changed,so2s)
37
38 # strip rule for the .so file
39 $(obj)/%.so: OBJCOPYFLAGS := -S
40 $(obj)/%.so: $(obj)/%.so.dbg FORCE
41 $(call if_changed,objcopy)
42
43 # actual build commands
44 # The DSO images are built using a special lin
45 # Make sure only to export the intended __vdso
46 quiet_cmd_vdsold = VDSOLD $@
47 cmd_vdsold = $(CC) $(KBUILD_CFLAGS) $(ca
48 -Wl,-T,$(filter-out
49 $(CROSS_COMPILE)objcopy \
50 $(patsubst %, -G __
51 rm $@.tmp
52
53 # Extracts symbol offsets from the VDSO, conve
54 # that contains the same symbols at the same o
55 quiet_cmd_so2s = SO2S $@
56 cmd_so2s = $(NM) -D $< | $(src)/so2s.sh
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