1 # SPDX-License-Identifier: GPL-2.0-only
2 # Copied from arch/tile/kernel/vdso/Makefile
3
4 # Include the generic Makefile to check the bu
5 include $(srctree)/lib/vdso/Makefile
6 # Symbols present in the vdso
7 vdso-syms = rt_sigreturn
8 ifdef CONFIG_64BIT
9 vdso-syms += vgettimeofday
10 endif
11 vdso-syms += getcpu
12 vdso-syms += flush_icache
13 vdso-syms += hwprobe
14 vdso-syms += sys_hwprobe
15
16 # Files to link into the vdso
17 obj-vdso = $(patsubst %, %.o, $(vdso-syms)) no
18
19 ccflags-y := -fno-stack-protector
20 ccflags-y += -DDISABLE_BRANCH_PROFILING
21 ccflags-y += -fno-builtin
22
23 ifneq ($(c-gettimeofday-y),)
24 CFLAGS_vgettimeofday.o += -fPIC -include $(c
25 endif
26
27 CFLAGS_hwprobe.o += -fPIC
28
29 # Build rules
30 targets := $(obj-vdso) vdso.so vdso.so.dbg vds
31 obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
32
33 obj-y += vdso.o
34 CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
35 ifneq ($(filter vgettimeofday, $(vdso-syms)),)
36 CPPFLAGS_vdso.lds += -DHAS_VGETTIMEOFDAY
37 endif
38
39 # Disable -pg to prevent insert call site
40 CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTR
41 CFLAGS_REMOVE_hwprobe.o = $(CC_FLAGS_FTRACE) $
42
43 # Force dependency
44 $(obj)/vdso.o: $(obj)/vdso.so
45
46 # link rule for the .so file, .lds has to be f
47 $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso
48 $(call if_changed,vdsold)
49 LDFLAGS_vdso.so.dbg = -shared -soname=linux-vd
50 --build-id=sha1 --hash-style=both --eh
51
52 # strip rule for the .so file
53 $(obj)/%.so: OBJCOPYFLAGS := -S
54 $(obj)/%.so: $(obj)/%.so.dbg FORCE
55 $(call if_changed,objcopy)
56
57 # Generate VDSO offsets using helper script
58 gen-vdsosym := $(src)/gen_vdso_offsets.sh
59 quiet_cmd_vdsosym = VDSOSYM $@
60 cmd_vdsosym = $(NM) $< | $(gen-vdsosym
61
62 include/generated/vdso-offsets.h: $(obj)/vdso.
63 $(call if_changed,vdsosym)
64
65 # actual build commands
66 # The DSO images are built using a special lin
67 # Make sure only to export the intended __vdso
68 quiet_cmd_vdsold = VDSOLD $@
69 cmd_vdsold = $(LD) $(ld_flags) -T $(filt
70 $(OBJCOPY) $(patsubst %, -G
71 rm $@.tmp
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