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. 5127b0e05SThomas Weißschuhinclude $(srctree)/lib/vdso/Makefile.include 6c6b99bedSHuacai Chen 74cd09f35SHuacai Chenobj-vdso-y := elf.o vgetcpu.o vgetrandom.o \ 818efd0b1SXi Ruoyao vgetrandom-chacha.o sigreturn.o 94cd09f35SHuacai Chenobj-vdso-$(CONFIG_GENERIC_GETTIMEOFDAY) += vgettimeofday.o 10c6b99bedSHuacai Chen 11c6b99bedSHuacai Chen# Common compiler flags between ABIs. 12c6b99bedSHuacai Chenccflags-vdso := \ 13c6b99bedSHuacai Chen $(filter -I%,$(KBUILD_CFLAGS)) \ 14c6b99bedSHuacai Chen $(filter -E%,$(KBUILD_CFLAGS)) \ 15*5643c6b2SHuacai Chen $(filter -m32,$(KBUILD_CFLAGS)) \ 16*5643c6b2SHuacai Chen $(filter -m64,$(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 224cd09f35SHuacai Chenifdef CONFIG_32BIT 234cd09f35SHuacai Chenccflags-vdso += -DBUILD_VDSO32 244cd09f35SHuacai Chenendif 254cd09f35SHuacai Chen 26c6b99bedSHuacai Chencflags-vdso := $(ccflags-vdso) \ 27e6ee9023SHuacai Chen -isystem $(shell $(CC) -print-file-name=include) \ 28c6b99bedSHuacai Chen $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \ 29ec4c2827SNathan Chancellor $(CC_FLAGS_DIALECT) -O2 -g -fno-strict-aliasing -fno-common -fno-builtin \ 30c6b99bedSHuacai Chen -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \ 31e4878c37SXi Ruoyao $(call cc-option, -fasynchronous-unwind-tables) \ 32c6b99bedSHuacai Chen $(call cc-option, -fno-stack-protector) 33c6b99bedSHuacai Chenaflags-vdso := $(ccflags-vdso) \ 34c6b99bedSHuacai Chen -D__ASSEMBLY__ -Wa,-gdwarf-2 35c6b99bedSHuacai Chen 36c6b99bedSHuacai Chenifneq ($(c-gettimeofday-y),) 37c6b99bedSHuacai Chen CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y) 38c6b99bedSHuacai Chenendif 39c6b99bedSHuacai Chen 4018efd0b1SXi Ruoyaoifneq ($(c-getrandom-y),) 4118efd0b1SXi Ruoyao CFLAGS_vgetrandom.o += -include $(c-getrandom-y) 4218efd0b1SXi Ruoyaoendif 4318efd0b1SXi Ruoyao 44c6b99bedSHuacai Chen# VDSO linker flags. 45c6b99bedSHuacai Chenldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \ 46e4878c37SXi Ruoyao $(filter -E%,$(KBUILD_CFLAGS)) -shared --build-id --eh-frame-hdr -T 47c6b99bedSHuacai Chen 48c6b99bedSHuacai Chen# 49c6b99bedSHuacai Chen# Shared build commands. 50c6b99bedSHuacai Chen# 51c6b99bedSHuacai Chen 52c6b99bedSHuacai Chenquiet_cmd_vdsold_and_vdso_check = LD $@ 53c6b99bedSHuacai Chen cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check) 54c6b99bedSHuacai Chen 55c6b99bedSHuacai Chenquiet_cmd_vdsoas_o_S = AS $@ 56c6b99bedSHuacai Chen cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $< 57c6b99bedSHuacai Chen 58c6b99bedSHuacai Chen# Generate VDSO offsets using helper script 59b1992c37SMasahiro Yamadagen-vdsosym := $(src)/gen_vdso_offsets.sh 60c6b99bedSHuacai Chenquiet_cmd_vdsosym = VDSOSYM $@ 61c6b99bedSHuacai Chen cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ 62c6b99bedSHuacai Chen 63c6b99bedSHuacai Cheninclude/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE 64c6b99bedSHuacai Chen $(call if_changed,vdsosym) 65c6b99bedSHuacai Chen 66c6b99bedSHuacai Chen# 67c6b99bedSHuacai Chen# Build native VDSO. 68c6b99bedSHuacai Chen# 69c6b99bedSHuacai Chen 70c6b99bedSHuacai Chennative-abi := $(filter -mabi=%,$(KBUILD_CFLAGS)) 71c6b99bedSHuacai Chen 72c6b99bedSHuacai Chentargets += $(obj-vdso-y) 73c6b99bedSHuacai Chentargets += vdso.lds vdso.so.dbg vdso.so 74c6b99bedSHuacai Chen 75c6b99bedSHuacai Chenobj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) 76c6b99bedSHuacai Chen 77c6b99bedSHuacai Chen$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi) 78c6b99bedSHuacai Chen$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi) 79c6b99bedSHuacai Chen 80c6b99bedSHuacai Chen$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi) 81c6b99bedSHuacai Chen 82c6b99bedSHuacai Chen$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE 83c6b99bedSHuacai Chen $(call if_changed,vdsold_and_vdso_check) 84c6b99bedSHuacai Chen 85c6b99bedSHuacai Chen$(obj)/vdso.so: OBJCOPYFLAGS := -S 86c6b99bedSHuacai Chen$(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE 87c6b99bedSHuacai Chen $(call if_changed,objcopy) 88c6b99bedSHuacai Chen 89c6b99bedSHuacai Chenobj-y += vdso.o 90c6b99bedSHuacai Chen 91c6b99bedSHuacai Chen$(obj)/vdso.o : $(obj)/vdso.so 92