1c6b99bedSHuacai Chen# SPDX-License-Identifier: GPL-2.0 2c6b99bedSHuacai Chen# Objects to go into the VDSO. 3c6b99bedSHuacai Chen 4aff69273SFangrui Song# Include the generic Makefile to check the built vdso. 5c6b99bedSHuacai Cheninclude $(srctree)/lib/vdso/Makefile 6c6b99bedSHuacai Chen 7*18efd0b1SXi Ruoyaoobj-vdso-y := elf.o vgetcpu.o vgettimeofday.o vgetrandom.o \ 8*18efd0b1SXi Ruoyao vgetrandom-chacha.o sigreturn.o 9c6b99bedSHuacai Chen 10c6b99bedSHuacai Chen# Common compiler flags between ABIs. 11c6b99bedSHuacai Chenccflags-vdso := \ 12c6b99bedSHuacai Chen $(filter -I%,$(KBUILD_CFLAGS)) \ 13c6b99bedSHuacai Chen $(filter -E%,$(KBUILD_CFLAGS)) \ 14c6b99bedSHuacai Chen $(filter -march=%,$(KBUILD_CFLAGS)) \ 15c6b99bedSHuacai Chen $(filter -m%-float,$(KBUILD_CFLAGS)) \ 16b89673a9SWANG Xuerui $(CLANG_FLAGS) \ 17c6b99bedSHuacai Chen -D__VDSO__ 18c6b99bedSHuacai Chen 19c6b99bedSHuacai Chencflags-vdso := $(ccflags-vdso) \ 20e6ee9023SHuacai Chen -isystem $(shell $(CC) -print-file-name=include) \ 21c6b99bedSHuacai Chen $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \ 2238b10b26SWANG Xuerui -O2 -g -fno-strict-aliasing -fno-common -fno-builtin \ 23c6b99bedSHuacai Chen -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \ 24c6b99bedSHuacai Chen $(call cc-option, -fno-asynchronous-unwind-tables) \ 25c6b99bedSHuacai Chen $(call cc-option, -fno-stack-protector) 26c6b99bedSHuacai Chenaflags-vdso := $(ccflags-vdso) \ 27c6b99bedSHuacai Chen -D__ASSEMBLY__ -Wa,-gdwarf-2 28c6b99bedSHuacai Chen 29c6b99bedSHuacai Chenifneq ($(c-gettimeofday-y),) 30c6b99bedSHuacai Chen CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y) 31c6b99bedSHuacai Chenendif 32c6b99bedSHuacai Chen 33*18efd0b1SXi Ruoyaoifneq ($(c-getrandom-y),) 34*18efd0b1SXi Ruoyao CFLAGS_vgetrandom.o += -include $(c-getrandom-y) 35*18efd0b1SXi Ruoyaoendif 36*18efd0b1SXi Ruoyao 37c6b99bedSHuacai Chen# VDSO linker flags. 38c6b99bedSHuacai Chenldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \ 39c6b99bedSHuacai Chen $(filter -E%,$(KBUILD_CFLAGS)) -nostdlib -shared \ 40c6b99bedSHuacai Chen --hash-style=sysv --build-id -T 41c6b99bedSHuacai Chen 42c6b99bedSHuacai Chen# 43c6b99bedSHuacai Chen# Shared build commands. 44c6b99bedSHuacai Chen# 45c6b99bedSHuacai Chen 46c6b99bedSHuacai Chenquiet_cmd_vdsold_and_vdso_check = LD $@ 47c6b99bedSHuacai Chen cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check) 48c6b99bedSHuacai Chen 49c6b99bedSHuacai Chenquiet_cmd_vdsoas_o_S = AS $@ 50c6b99bedSHuacai Chen cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $< 51c6b99bedSHuacai Chen 52c6b99bedSHuacai Chen# Generate VDSO offsets using helper script 53b1992c37SMasahiro Yamadagen-vdsosym := $(src)/gen_vdso_offsets.sh 54c6b99bedSHuacai Chenquiet_cmd_vdsosym = VDSOSYM $@ 55c6b99bedSHuacai Chen cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ 56c6b99bedSHuacai Chen 57c6b99bedSHuacai Cheninclude/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE 58c6b99bedSHuacai Chen $(call if_changed,vdsosym) 59c6b99bedSHuacai Chen 60c6b99bedSHuacai Chen# 61c6b99bedSHuacai Chen# Build native VDSO. 62c6b99bedSHuacai Chen# 63c6b99bedSHuacai Chen 64c6b99bedSHuacai Chennative-abi := $(filter -mabi=%,$(KBUILD_CFLAGS)) 65c6b99bedSHuacai Chen 66c6b99bedSHuacai Chentargets += $(obj-vdso-y) 67c6b99bedSHuacai Chentargets += vdso.lds vdso.so.dbg vdso.so 68c6b99bedSHuacai Chen 69c6b99bedSHuacai Chenobj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) 70c6b99bedSHuacai Chen 71c6b99bedSHuacai Chen$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi) 72c6b99bedSHuacai Chen$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi) 73c6b99bedSHuacai Chen 74c6b99bedSHuacai Chen$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi) 75c6b99bedSHuacai Chen 76c6b99bedSHuacai Chen$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE 77c6b99bedSHuacai Chen $(call if_changed,vdsold_and_vdso_check) 78c6b99bedSHuacai Chen 79c6b99bedSHuacai Chen$(obj)/vdso.so: OBJCOPYFLAGS := -S 80c6b99bedSHuacai Chen$(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE 81c6b99bedSHuacai Chen $(call if_changed,objcopy) 82c6b99bedSHuacai Chen 83c6b99bedSHuacai Chenobj-y += vdso.o 84c6b99bedSHuacai Chen 85c6b99bedSHuacai Chen$(obj)/vdso.o : $(obj)/vdso.so 86