1c6b99bedSHuacai Chen# SPDX-License-Identifier: GPL-2.0 2c6b99bedSHuacai Chen# Objects to go into the VDSO. 3c6b99bedSHuacai Chen 45aa4ac64SQing ZhangKASAN_SANITIZE := n 5d382f733SKees CookUBSAN_SANITIZE := n 62363088eSFeiyang ChenKCOV_INSTRUMENT := n 72363088eSFeiyang Chen 8aff69273SFangrui Song# Include the generic Makefile to check the built vdso. 9c6b99bedSHuacai Cheninclude $(srctree)/lib/vdso/Makefile 10c6b99bedSHuacai Chen 11dce6098bSHuacai Chenobj-vdso-y := elf.o vgetcpu.o vgettimeofday.o sigreturn.o 12c6b99bedSHuacai Chen 13c6b99bedSHuacai Chen# Common compiler flags between ABIs. 14c6b99bedSHuacai Chenccflags-vdso := \ 15c6b99bedSHuacai Chen $(filter -I%,$(KBUILD_CFLAGS)) \ 16c6b99bedSHuacai Chen $(filter -E%,$(KBUILD_CFLAGS)) \ 17c6b99bedSHuacai Chen $(filter -march=%,$(KBUILD_CFLAGS)) \ 18c6b99bedSHuacai Chen $(filter -m%-float,$(KBUILD_CFLAGS)) \ 19b89673a9SWANG Xuerui $(CLANG_FLAGS) \ 20c6b99bedSHuacai Chen -D__VDSO__ 21c6b99bedSHuacai Chen 22c6b99bedSHuacai Chencflags-vdso := $(ccflags-vdso) \ 23e6ee9023SHuacai Chen -isystem $(shell $(CC) -print-file-name=include) \ 24c6b99bedSHuacai Chen $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \ 25*a639cea4STiezhu Yang -std=gnu11 -O2 -g -fno-strict-aliasing -fno-common -fno-builtin \ 26c6b99bedSHuacai Chen -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \ 27c6b99bedSHuacai Chen $(call cc-option, -fno-asynchronous-unwind-tables) \ 28c6b99bedSHuacai Chen $(call cc-option, -fno-stack-protector) 29c6b99bedSHuacai Chenaflags-vdso := $(ccflags-vdso) \ 30c6b99bedSHuacai Chen -D__ASSEMBLY__ -Wa,-gdwarf-2 31c6b99bedSHuacai Chen 32c6b99bedSHuacai Chenifneq ($(c-gettimeofday-y),) 33c6b99bedSHuacai Chen CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y) 34c6b99bedSHuacai Chenendif 35c6b99bedSHuacai Chen 36c6b99bedSHuacai Chen# VDSO linker flags. 37c6b99bedSHuacai Chenldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \ 38c6b99bedSHuacai Chen $(filter -E%,$(KBUILD_CFLAGS)) -nostdlib -shared \ 39c6b99bedSHuacai Chen --hash-style=sysv --build-id -T 40c6b99bedSHuacai Chen 41c6b99bedSHuacai ChenGCOV_PROFILE := n 42c6b99bedSHuacai Chen 43c6b99bedSHuacai Chen# 44c6b99bedSHuacai Chen# Shared build commands. 45c6b99bedSHuacai Chen# 46c6b99bedSHuacai Chen 47c6b99bedSHuacai Chenquiet_cmd_vdsold_and_vdso_check = LD $@ 48c6b99bedSHuacai Chen cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check) 49c6b99bedSHuacai Chen 50c6b99bedSHuacai Chenquiet_cmd_vdsoas_o_S = AS $@ 51c6b99bedSHuacai Chen cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $< 52c6b99bedSHuacai Chen 53c6b99bedSHuacai Chen# Generate VDSO offsets using helper script 54c6b99bedSHuacai Chengen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh 55c6b99bedSHuacai Chenquiet_cmd_vdsosym = VDSOSYM $@ 56c6b99bedSHuacai Chen cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ 57c6b99bedSHuacai Chen 58c6b99bedSHuacai Cheninclude/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE 59c6b99bedSHuacai Chen $(call if_changed,vdsosym) 60c6b99bedSHuacai Chen 61c6b99bedSHuacai Chen# 62c6b99bedSHuacai Chen# Build native VDSO. 63c6b99bedSHuacai Chen# 64c6b99bedSHuacai Chen 65c6b99bedSHuacai Chennative-abi := $(filter -mabi=%,$(KBUILD_CFLAGS)) 66c6b99bedSHuacai Chen 67c6b99bedSHuacai Chentargets += $(obj-vdso-y) 68c6b99bedSHuacai Chentargets += vdso.lds vdso.so.dbg vdso.so 69c6b99bedSHuacai Chen 70c6b99bedSHuacai Chenobj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) 71c6b99bedSHuacai Chen 72c6b99bedSHuacai Chen$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi) 73c6b99bedSHuacai Chen$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi) 74c6b99bedSHuacai Chen 75c6b99bedSHuacai Chen$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi) 76c6b99bedSHuacai Chen 77c6b99bedSHuacai Chen$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE 78c6b99bedSHuacai Chen $(call if_changed,vdsold_and_vdso_check) 79c6b99bedSHuacai Chen 80c6b99bedSHuacai Chen$(obj)/vdso.so: OBJCOPYFLAGS := -S 81c6b99bedSHuacai Chen$(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE 82c6b99bedSHuacai Chen $(call if_changed,objcopy) 83c6b99bedSHuacai Chen 84c6b99bedSHuacai Chenobj-y += vdso.o 85c6b99bedSHuacai Chen 86c6b99bedSHuacai Chen$(obj)/vdso.o : $(obj)/vdso.so 87