1# SPDX-License-Identifier: GPL-2.0 2# Objects to go into the VDSO. 3 4# Include the generic Makefile to check the built vdso. 5include $(srctree)/lib/vdso/Makefile 6 7obj-vdso-y := elf.o vgetcpu.o vgettimeofday.o sigreturn.o 8 9# Common compiler flags between ABIs. 10ccflags-vdso := \ 11 $(filter -I%,$(KBUILD_CFLAGS)) \ 12 $(filter -E%,$(KBUILD_CFLAGS)) \ 13 $(filter -march=%,$(KBUILD_CFLAGS)) \ 14 $(filter -m%-float,$(KBUILD_CFLAGS)) \ 15 $(CLANG_FLAGS) \ 16 -D__VDSO__ 17 18cflags-vdso := $(ccflags-vdso) \ 19 -isystem $(shell $(CC) -print-file-name=include) \ 20 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \ 21 -O2 -g -fno-strict-aliasing -fno-common -fno-builtin \ 22 -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \ 23 $(call cc-option, -fno-asynchronous-unwind-tables) \ 24 $(call cc-option, -fno-stack-protector) 25aflags-vdso := $(ccflags-vdso) \ 26 -D__ASSEMBLY__ -Wa,-gdwarf-2 27 28ifneq ($(c-gettimeofday-y),) 29 CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y) 30endif 31 32# VDSO linker flags. 33ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \ 34 $(filter -E%,$(KBUILD_CFLAGS)) -nostdlib -shared \ 35 --hash-style=sysv --build-id -T 36 37GCOV_PROFILE := n 38 39# 40# Shared build commands. 41# 42 43quiet_cmd_vdsold_and_vdso_check = LD $@ 44 cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check) 45 46quiet_cmd_vdsoas_o_S = AS $@ 47 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $< 48 49# Generate VDSO offsets using helper script 50gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh 51quiet_cmd_vdsosym = VDSOSYM $@ 52 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ 53 54include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE 55 $(call if_changed,vdsosym) 56 57# 58# Build native VDSO. 59# 60 61native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS)) 62 63targets += $(obj-vdso-y) 64targets += vdso.lds vdso.so.dbg vdso.so 65 66obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) 67 68$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi) 69$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi) 70 71$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi) 72 73$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE 74 $(call if_changed,vdsold_and_vdso_check) 75 76$(obj)/vdso.so: OBJCOPYFLAGS := -S 77$(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE 78 $(call if_changed,objcopy) 79 80obj-y += vdso.o 81 82$(obj)/vdso.o : $(obj)/vdso.so 83 84# install commands for the unstripped file 85quiet_cmd_vdso_install = INSTALL $@ 86 cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ 87 88vdso.so: $(obj)/vdso.so.dbg 89 @mkdir -p $(MODLIB)/vdso 90 $(call cmd,vdso_install) 91 92vdso_install: vdso.so 93