1 # SPDX-License-Identifier: GPL-2.0
2 # Objects to go into the VDSO.
7 # Include the generic Makefile to check the built vdso.
8 include $(srctree)/lib/vdso/Makefile
10 obj-vdso-y := elf.o vgetcpu.o vgettimeofday.o sigreturn.o
12 # Common compiler flags between ABIs.
14 $(filter -I%,$(KBUILD_CFLAGS)) \
15 $(filter -E%,$(KBUILD_CFLAGS)) \
16 $(filter -march=%,$(KBUILD_CFLAGS)) \
17 $(filter -m%-float,$(KBUILD_CFLAGS)) \
21 cflags-vdso := $(ccflags-vdso) \
22 -isystem $(shell $(CC) -print-file-name=include) \
23 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
24 -O2 -g -fno-strict-aliasing -fno-common -fno-builtin \
25 -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
26 $(call cc-option, -fno-asynchronous-unwind-tables) \
27 $(call cc-option, -fno-stack-protector)
28 aflags-vdso := $(ccflags-vdso) \
29 -D__ASSEMBLY__ -Wa,-gdwarf-2
31 ifneq ($(c-gettimeofday-y),)
32 CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
36 ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
37 $(filter -E%,$(KBUILD_CFLAGS)) -nostdlib -shared \
38 --hash-style=sysv --build-id -T
43 # Shared build commands.
46 quiet_cmd_vdsold_and_vdso_check = LD $@
47 cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check)
49 quiet_cmd_vdsoas_o_S = AS $@
50 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
52 # Generate VDSO offsets using helper script
53 gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh
54 quiet_cmd_vdsosym = VDSOSYM $@
55 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
57 include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE
58 $(call if_changed,vdsosym)
64 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
66 targets += $(obj-vdso-y)
67 targets += vdso.lds vdso.so.dbg vdso.so
69 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
71 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
72 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
74 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
76 $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE
77 $(call if_changed,vdsold_and_vdso_check)
79 $(obj)/vdso.so: OBJCOPYFLAGS := -S
80 $(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE
81 $(call if_changed,objcopy)
85 $(obj)/vdso.o : $(obj)/vdso.so