1 # SPDX-License-Identifier: GPL-2.0
2 # Objects to go into the VDSO.
8 # Include the generic Makefile to check the built vdso.
9 include $(srctree)/lib/vdso/Makefile
11 obj-vdso-y := elf.o vgetcpu.o vgettimeofday.o sigreturn.o
13 # Common compiler flags between ABIs.
15 $(filter -I%,$(KBUILD_CFLAGS)) \
16 $(filter -E%,$(KBUILD_CFLAGS)) \
17 $(filter -march=%,$(KBUILD_CFLAGS)) \
18 $(filter -m%-float,$(KBUILD_CFLAGS)) \
22 cflags-vdso := $(ccflags-vdso) \
23 -isystem $(shell $(CC) -print-file-name=include) \
24 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
25 -O2 -g -fno-strict-aliasing -fno-common -fno-builtin \
26 -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
27 $(call cc-option, -fno-asynchronous-unwind-tables) \
28 $(call cc-option, -fno-stack-protector)
29 aflags-vdso := $(ccflags-vdso) \
30 -D__ASSEMBLY__ -Wa,-gdwarf-2
32 ifneq ($(c-gettimeofday-y),)
33 CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
37 ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
38 $(filter -E%,$(KBUILD_CFLAGS)) -nostdlib -shared \
39 --hash-style=sysv --build-id -T
44 # Shared build commands.
47 quiet_cmd_vdsold_and_vdso_check = LD $@
48 cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check)
50 quiet_cmd_vdsoas_o_S = AS $@
51 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
53 # Generate VDSO offsets using helper script
54 gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh
55 quiet_cmd_vdsosym = VDSOSYM $@
56 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
58 include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE
59 $(call if_changed,vdsosym)
65 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
67 targets += $(obj-vdso-y)
68 targets += vdso.lds vdso.so.dbg vdso.so
70 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
72 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
73 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
75 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
77 $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE
78 $(call if_changed,vdsold_and_vdso_check)
80 $(obj)/vdso.so: OBJCOPYFLAGS := -S
81 $(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE
82 $(call if_changed,objcopy)
86 $(obj)/vdso.o : $(obj)/vdso.so