1 # SPDX-License-Identifier: GPL-2.0
2 # Objects to go into the VDSO.
3
4 # Include the generic Makefile to check the bu
5 include $(srctree)/lib/vdso/Makefile
6
7 obj-vdso-y := elf.o vgetcpu.o vgettimeofday.o
8 vgetrandom-chacha.o sigreturn.o
9
10 # Common compiler flags between ABIs.
11 ccflags-vdso := \
12 $(filter -I%,$(KBUILD_CFLAGS)) \
13 $(filter -E%,$(KBUILD_CFLAGS)) \
14 $(filter -march=%,$(KBUILD_CFLAGS)) \
15 $(filter -m%-float,$(KBUILD_CFLAGS)) \
16 $(CLANG_FLAGS) \
17 -D__VDSO__
18
19 cflags-vdso := $(ccflags-vdso) \
20 -isystem $(shell $(CC) -print-file-nam
21 $(filter -W%,$(filter-out -Wa$(comma)%
22 -O2 -g -fno-strict-aliasing -fno-commo
23 -fno-stack-protector -fno-jump-tables
24 $(call cc-option, -fno-asynchronous-un
25 $(call cc-option, -fno-stack-protector
26 aflags-vdso := $(ccflags-vdso) \
27 -D__ASSEMBLY__ -Wa,-gdwarf-2
28
29 ifneq ($(c-gettimeofday-y),)
30 CFLAGS_vgettimeofday.o += -include $(c-getti
31 endif
32
33 ifneq ($(c-getrandom-y),)
34 CFLAGS_vgetrandom.o += -include $(c-getrando
35 endif
36
37 # VDSO linker flags.
38 ldflags-y := -Bsymbolic --no-undefined -soname
39 $(filter -E%,$(KBUILD_CFLAGS)) -nostdl
40 --hash-style=sysv --build-id -T
41
42 #
43 # Shared build commands.
44 #
45
46 quiet_cmd_vdsold_and_vdso_check = LD $@
47 cmd_vdsold_and_vdso_check = $(cmd_ld); $
48
49 quiet_cmd_vdsoas_o_S = AS $@
50 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o
51
52 # Generate VDSO offsets using helper script
53 gen-vdsosym := $(src)/gen_vdso_offsets.sh
54 quiet_cmd_vdsosym = VDSOSYM $@
55 cmd_vdsosym = $(NM) $< | $(gen-vdsosym)
56
57 include/generated/vdso-offsets.h: $(obj)/vdso.
58 $(call if_changed,vdsosym)
59
60 #
61 # Build native VDSO.
62 #
63
64 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS
65
66 targets += $(obj-vdso-y)
67 targets += vdso.lds vdso.so.dbg vdso.so
68
69 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
70
71 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $
72 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $
73
74 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-
75
76 $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso
77 $(call if_changed,vdsold_and_vdso_chec
78
79 $(obj)/vdso.so: OBJCOPYFLAGS := -S
80 $(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE
81 $(call if_changed,objcopy)
82
83 obj-y += vdso.o
84
85 $(obj)/vdso.o : $(obj)/vdso.so
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